class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to process_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(
heartbeat_secs=CFG.cc.timeout.heartbeat,
failure_notify_callback=self._spawned_proc_failed)
# list of callbacks for process state changes
self._proc_state_change_callbacks = []
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
# Register container as resource object
cc_obj = CapabilityContainer(name=self.container.id,
cc_agent=self.container.name)
self.cc_id, _ = self.container.resource_registry.create(cc_obj)
#Create an association to an Org object if not the rot ION org and only if found
if CFG.container.org_name and CFG.container.org_name != CFG.system.root_org:
org, _ = self.container.resource_registry.find_resources(
restype=RT.Org, name=CFG.container.org_name, id_only=True)
if org:
self.container.resource_registry.create_association(
org[0], PRED.hasResource,
self.cc_id) # TODO - replace with proper association
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
from pyon.datastore.couchdb.couchdb_datastore import CouchDB_DataStore
stats1 = CouchDB_DataStore._stats.get_stats()
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
procs_list = sorted(self.procs.values(),
key=lambda proc: proc._proc_start_time,
reverse=True)
for proc in procs_list:
try:
self.terminate_process(proc.id)
except Exception as ex:
log.warn("Failed to terminate process (%s): %s", proc.id, ex)
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
if self.procs:
log.warn("ProcManager procs not empty: %s", self.procs)
if self.procs_by_name:
log.warn("ProcManager procs_by_name not empty: %s",
self.procs_by_name)
# Remove Resource registration
try:
self.container.resource_registry.delete(self.cc_id,
del_associations=True)
except NotFound:
# already gone, this is ok
pass
# TODO: Check associations to processes
stats2 = CouchDB_DataStore._stats.get_stats()
stats3 = CouchDB_DataStore._stats.diff_stats(stats2, stats1)
log.debug("Datastore stats difference during stop(): %s", stats3)
log.debug("ProcManager stopped, OK.")
def spawn_process(self,
name=None,
module=None,
cls=None,
config=None,
process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" %
process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id,
self.proc_id_pool.get_id())
log.debug(
"ProcManager.spawn_process(name=%s, module.cls=%s.%s, config=%s) as pid=%s",
name, module, cls, config, process_id)
process_cfg = deepcopy(CFG)
if config:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
dict_merge(process_cfg, config, inplace=True)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(process_cfg,
self.container.spawn_args,
inplace=True)
#log.debug("spawn_process() pid=%s process_cfg=%s", process_id, process_cfg)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of: service, stream_process, agent, simple, immediate
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(process_cfg, "process.type") or getattr(
service_cls, "process_type", "service")
process_start_mode = get_safe(config, "process.start_mode")
process_instance = None
# alert we have a spawning process, but we don't have the instance yet, so give the class instead (more accurate than name)
self._call_proc_state_changed("%s.%s" % (module, cls),
ProcessStateEnum.PENDING)
try:
# spawn service by type
if process_type == "service":
process_instance = self._spawn_service_process(
process_id, name, module, cls, process_cfg)
elif process_type == "stream_process":
process_instance = self._spawn_stream_process(
process_id, name, module, cls, process_cfg)
elif process_type == "agent":
process_instance = self._spawn_agent_process(
process_id, name, module, cls, process_cfg)
elif process_type == "standalone":
process_instance = self._spawn_standalone_process(
process_id, name, module, cls, process_cfg)
elif process_type == "immediate":
process_instance = self._spawn_immediate_process(
process_id, name, module, cls, process_cfg)
elif process_type == "simple":
process_instance = self._spawn_simple_process(
process_id, name, module, cls, process_cfg)
else:
raise BadRequest("Unknown process type: %s" % process_type)
process_instance._proc_type = process_type
self._register_process(process_instance, name)
process_instance.errcause = "OK"
log.info("ProcManager.spawn_process: %s.%s -> pid=%s OK", module,
cls, process_id)
if process_type == 'immediate':
log.info('Terminating immediate process: %s',
process_instance.id)
self.terminate_process(process_instance.id)
# terminate process also triggers TERMINATING/TERMINATED
self._call_proc_state_changed(process_instance,
ProcessStateEnum.EXITED)
else:
#Shouldn't be any policies for immediate processes
self.update_container_policies(process_instance)
return process_instance.id
except IonProcessError:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s",
name, process_type, process_id, errcause)
return None
except Exception:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s",
name, process_type, process_id, errcause)
# trigger failed notification - catches problems in init/start
self._call_proc_state_changed(process_instance,
ProcessStateEnum.FAILED)
raise
#This must be called after registering the process
def update_container_policies(self, process_instance):
if not self.container.governance_controller:
return
if process_instance._proc_type == "service":
# look to load any existing policies for this service
self.container.governance_controller.safe_update_service_access_policy(
process_instance._proc_listen_name)
if process_instance._proc_type == "agent":
# look to load any existing policies for this agent service
if process_instance.resource_type is None:
self.container.governance_controller.safe_update_service_access_policy(
process_instance.name)
else:
self.container.governance_controller.safe_update_service_access_policy(
process_instance.resource_type)
if process_instance.resource_id:
# look to load any existing policies for this resource
self.container.governance_controller.safe_update_resource_access_policy(
process_instance.resource_id)
def list_local_processes(self, process_type=''):
"""
Returns a list of the running ION processes in the container or filtered by the process_type
"""
if not process_type:
return self.procs.values()
return [
p for p in self.procs.itervalues()
if p.process_type == process_type
]
def get_a_local_process(self, proc_name=''):
"""
Returns a running ION processes in the container for the specified name
"""
for p in self.procs.itervalues():
if p.name == proc_name:
return p
if p.process_type == 'agent' and p.resource_type == proc_name:
return p
return None
def is_local_service_process(self, service_name):
local_services = self.list_local_processes('service')
for p in local_services:
if p.name == service_name:
return True
return False
def is_local_agent_process(self, resource_type):
local_agents = self.list_local_processes('agent')
for p in local_agents:
if p.resource_type == resource_type:
return True
return False
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s, %s", gproc,
gproc.exception)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
prc = self._spawned_proc_to_process.get(gproc, None)
#
# # make sure prc is in our list
# if not prc in self.procs.values():
# log.warn("prc %s not found in procs list", prc)
# return
# stop the rest of the process
if prc is not None:
try:
self.terminate_process(prc.id, False)
except Exception as e:
log.warn(
"Problem while stopping rest of failed process %s: %s",
prc, e)
finally:
self._call_proc_state_changed(prc, ProcessStateEnum.FAILED)
else:
log.warn("No ION process found for failed proc manager child: %s",
gproc)
#self.container.fail_fast("Container process (%s) failed: %s" % (svc, gproc.exception))
def _cleanup_method(self, queue_name, ep=None):
"""
Common method to be passed to each spawned ION process to clean up their process-queue.
@TODO Leaks implementation detail, should be using XOs
"""
if ep._chan is not None and not ep._chan._queue_auto_delete:
# only need to delete if AMQP didn't handle it for us already!
# @TODO this will not work with XOs (future)
try:
ch = self.container.node.channel(RecvChannel)
ch._recv_name = NameTrio(
get_sys_name(), "%s.%s" % (get_sys_name(), queue_name))
ch._destroy_queue()
except TransportError as ex:
log.warn("Cleanup method triggered an error, ignoring: %s", ex)
def add_proc_state_changed_callback(self, cb):
"""
Adds a callback to be called when a process' state changes.
The callback should take three parameters: The process, the state, and the container.
"""
self._proc_state_change_callbacks.append(cb)
def remove_proc_state_changed_callback(self, cb):
"""
Removes a callback from the process state change callback list.
If the callback is not registered, this method does nothing.
"""
if cb in self._proc_state_change_callbacks:
self._proc_state_change_callbacks.remove(cb)
def _call_proc_state_changed(self, svc, state):
"""
Internal method to call all registered process state change callbacks.
"""
log.debug("Proc State Changed (%s): %s",
ProcessStateEnum._str_map.get(state, state), svc)
for cb in self._proc_state_change_callbacks:
cb(svc, state, self.container)
def _create_listening_endpoint(self, **kwargs):
"""
Creates a listening endpoint for spawning processes.
This method exists to be able to override the type created via configuration.
In most cases it will create a ConversationRPCServer.
"""
eptypestr = CFG.get_safe(
'container.messaging.endpoint.proc_listening_type', None)
if eptypestr is not None:
module, cls = eptypestr.rsplit('.', 1)
mod = __import__(module, fromlist=[cls])
eptype = getattr(mod, cls)
ep = eptype(**kwargs)
else:
conv_enabled = CFG.get_safe(
'container.messaging.endpoint.rpc_conversation_enabled', False)
if conv_enabled:
ep = ConversationRPCServer(**kwargs)
else:
ep = ProcessRPCServer(**kwargs)
return ep
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
listen_name = get_safe(config,
"process.listen_name") or process_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
# Service RPC endpoint
rsvc1 = self._create_listening_endpoint(node=self.container.node,
from_name=listen_name,
service=process_instance,
process=process_instance)
# Named local RPC endpoint
rsvc2 = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
service=process_instance,
process=process_instance)
# cleanup method to delete process queue
cleanup = lambda _: self._cleanup_method(process_instance.id, rsvc2)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc1, rsvc2],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_service_process for %s" % ",".join(
(listen_name, process_instance.id)))
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance,
ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or name
log.debug("Stream Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
process_instance.stream_subscriber = StreamSubscriber(
process=process_instance,
exchange_name=listen_name,
callback=process_instance.call_process)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance,
publish_streams)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
service=process_instance,
process=process_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
self._cleanup_method(process_instance.id, rsvc)
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(
name=process_instance.id,
service=process_instance,
listeners=[rsvc, process_instance.stream_subscriber],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_stream_process for %s" % process_instance._proc_name)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance,
ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
if not isinstance(process_instance, ResourceAgent) and not isinstance(
process_instance, SimpleResourceAgent):
raise ContainerConfigError(
"Agent process must extend ResourceAgent")
listeners = []
# Set the resource ID if we get it through the config
resource_id = get_safe(process_instance.CFG, "agent.resource_id")
if resource_id:
process_instance.resource_id = resource_id
alistener = self._create_listening_endpoint(
node=self.container.node,
from_name=resource_id,
service=process_instance,
process=process_instance)
listeners.append(alistener)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
service=process_instance,
process=process_instance)
listeners.append(rsvc)
# cleanup method to delete process/agent queue (@TODO: leaks a bit here - should use XOs)
def agent_cleanup(x):
self._cleanup_method(process_instance.id, rsvc)
if resource_id:
pass
#self._cleanup_method(resource_id, alistener)
# disabled, it's probably not architecturally correct to delete this queue
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=listeners,
proc_name=process_instance._proc_name,
cleanup_method=agent_cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_agent_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
# Now call the on_init of the agent.
self._process_init(process_instance)
if not process_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance,
ProcessStateEnum.FAILED)
raise
if not process_instance.resource_id:
log.warn("Agent process id=%s does not define resource_id!!" %
process_instance.id)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
service=process_instance,
process=process_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance,
publish_streams)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
self._cleanup_method(process_instance.id, rsvc)
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_standalone_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance,
ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance,
publish_streams)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_simple_process for %s" % process_instance.id)
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
process_instance = self._create_process_instance(
process_id, name, module, cls, config)
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
def _create_process_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
process_instance = for_name(module, cls)
if not isinstance(process_instance, BaseService):
raise ContainerConfigError(
"Instantiated service not a BaseService %r" % process_instance)
# Prepare service instance
process_instance.errcause = ""
process_instance.id = process_id
process_instance.container = self.container
process_instance.CFG = config
process_instance._proc_name = name
process_instance._proc_start_time = time.time()
#Unless the process has been started as part of another Org, default to the container Org or the ION Org
if config.has_key('org_name'):
process_instance.org_name = config['org_name']
else:
process_instance.org_name = CFG.get_safe(
'container.org_name', CFG.get_safe('system.root_org', 'ION'))
# Add stateful process operations
if hasattr(process_instance, "_flush_state"):
def _flush_state():
if not hasattr(process_instance, "_proc_state"):
process_instance._proc_state = {}
process_instance._proc_state_changed = False
return
process_instance.container.state_repository.put_state(
process_instance.id, process_instance._proc_state)
process_instance._proc_state_changed = False
def _load_state():
if not hasattr(process_instance, "_proc_state"):
process_instance._proc_state = {}
try:
new_state = process_instance.container.state_repository.get_state(
process_instance.id)
process_instance._proc_state.clear()
process_instance._proc_state.update(new_state)
process_instance._proc_state_changed = False
except Exception as ex:
log.warn("Process %s load state failed: %s",
process_instance.id, str(ex))
process_instance._flush_state = _flush_state
process_instance._load_state = _load_state
process_start_mode = get_safe(config, "process.start_mode")
if process_start_mode == "RESTART":
if hasattr(process_instance, "_load_state"):
process_instance._load_state()
# start service dependencies (RPC clients)
self._start_process_dependencies(process_instance)
return process_instance
def _start_process_dependencies(self, process_instance):
process_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s",
process_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in process_instance.dependencies:
client = getattr(process_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = process_instance
client.node = self.container.node
# ensure that dep actually exists and is running
# MM: commented out - during startup (init actually), we don't need to check for service dependencies
# MM: TODO: split on_init from on_start; start consumer in on_start; check for full queues on restart
# if process_instance.name != 'bootstrap' or (process_instance.name == 'bootstrap' and process_instance.CFG.level == dependency):
# svc_de = self.container.resource_registry.find_resources(restype="Service", name=dependency, id_only=True)
# if not svc_de:
# raise ContainerConfigError("Dependency for service %s not running: %s" % (process_instance.name, dependency))
def _process_init(self, process_instance):
# Init process
process_instance.errcause = "initializing service"
process_instance.init()
def _process_start(self, process_instance):
# Start process
# THIS SHOULD BE CALLED LATER THAN SPAWN
# TODO: Check for timeout
process_instance.errcause = "starting service"
process_instance.start()
def _process_quit(self, process_instance):
"""
Common method to handle process stopping.
"""
process_instance.errcause = "quitting process"
# Give the process notice to quit doing stuff.
process_instance.quit()
# Terminate IonProcessThread (may not have one, i.e. simple process)
# @TODO: move this into process' on_quit()
if getattr(process_instance, '_process',
None) is not None and process_instance._process:
process_instance._process.notify_stop()
process_instance._process.stop()
def _set_publisher_endpoints(self,
process_instance,
publisher_streams=None):
publisher_streams = publisher_streams or {}
names = []
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = StreamPublisher(process=process_instance,
stream_id=stream_id)
setattr(process_instance, name, pub)
names.append(name)
return names
def _register_process(self, process_instance, name):
"""
Performs all actions related to registering the new process in the system.
Also performs process type specific registration, such as for services and agents
"""
# Add process instance to container's process dict
if name in self.procs_by_name:
log.warn("Process name already registered in container: %s" % name)
self.procs_by_name[name] = process_instance
self.procs[process_instance.id] = process_instance
# Add Process to resource registry
# Note: In general the Process resource should be created by the CEI PD, but not all processes are CEI
# processes. How to deal with this?
process_instance.errcause = "registering"
if process_instance._proc_type != "immediate":
proc_obj = Process(name=process_instance.id,
label=name,
proctype=process_instance._proc_type)
proc_id, _ = self.container.resource_registry.create(proc_obj)
process_instance._proc_res_id = proc_id
# Associate process with container resource
self.container.resource_registry.create_association(
self.cc_id, "hasProcess", proc_id)
else:
process_instance._proc_res_id = None
# Process type specific registration
# TODO: Factor out into type specific handler functions
if process_instance._proc_type == "service":
# Registration of SERVICE process: in resource registry
service_list, _ = self.container.resource_registry.find_resources(
restype="Service", name=process_instance.name)
if service_list:
process_instance._proc_svc_id = service_list[0]._id
else:
# We are starting the first process of a service instance
# TODO: This should be created by the HA Service agent in the future
svc_obj = Service(
name=process_instance.name,
exchange_name=process_instance._proc_listen_name,
state=ServiceStateEnum.READY)
process_instance._proc_svc_id, _ = self.container.resource_registry.create(
svc_obj)
# Create association to service definition resource
svcdef_list, _ = self.container.resource_registry.find_resources(
restype="ServiceDefinition", name=process_instance.name)
if svcdef_list:
self.container.resource_registry.create_association(
process_instance._proc_svc_id, "hasServiceDefinition",
svcdef_list[0]._id)
else:
log.error("Cannot find ServiceDefinition resource for %s",
process_instance.name)
self.container.resource_registry.create_association(
process_instance._proc_svc_id, "hasProcess", proc_id)
elif process_instance._proc_type == "agent":
# Registration of AGENT process: in Directory
caps = process_instance.get_capabilities()
self.container.directory.register(
"/Agents", process_instance.id,
**dict(name=process_instance._proc_name,
container=process_instance.container.id,
resource_id=process_instance.resource_id,
agent_id=process_instance.agent_id,
def_id=process_instance.agent_def_id,
capabilities=caps))
self._call_proc_state_changed(process_instance,
ProcessStateEnum.RUNNING)
def terminate_process(self, process_id, do_notifications=True):
"""
Terminates a process and all its resources. Termination is graceful with timeout.
@param process_id The id of the process to terminate. Should exist in the container's
list of processes or this will raise.
@param do_notifications If True, emits process state changes for TERMINATING and TERMINATED.
If False, supresses any state changes. Used near EXITED and FAILED.
"""
process_instance = self.procs.get(process_id, None)
if not process_instance:
raise BadRequest(
"Cannot terminate. Process id='%s' unknown on container id='%s'"
% (process_id, self.container.id))
log.info("ProcManager.terminate_process: %s -> pid=%s",
process_instance._proc_name, process_id)
if do_notifications:
self._call_proc_state_changed(process_instance,
ProcessStateEnum.TERMINATING)
self._process_quit(process_instance)
self._unregister_process(process_id, process_instance)
if do_notifications:
self._call_proc_state_changed(process_instance,
ProcessStateEnum.TERMINATED)
def _unregister_process(self, process_id, process_instance):
# Remove process registration in resource registry
if process_instance._proc_res_id:
try:
self.container.resource_registry.delete(
process_instance._proc_res_id, del_associations=True)
except NotFound: #, HTTPException):
# if it's already gone, it's already gone!
pass
except Exception, ex:
log.exception(ex)
pass
# Cleanup for specific process types
if process_instance._proc_type == "service":
# Check if this is the last process for this service and do auto delete service resources here
svcproc_list = []
try:
svcproc_list, _ = self.container.resource_registry.find_objects(
process_instance._proc_svc_id,
"hasProcess",
"Process",
id_only=True)
except ResourceNotFound:
# if it's already gone, it's already gone!
pass
if not svcproc_list:
try:
self.container.resource_registry.delete(
process_instance._proc_svc_id, del_associations=True)
except NotFound:
# if it's already gone, it's already gone!
pass
except Exception, ex:
log.exception(ex)
pass
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API, and add
self.container_api = [self.spawn_process, self.terminate_process]
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Registry of running processes
self.procs = {}
self.procs_by_name = {} # BAD: This is not correct if procs have the same name
# mapping of greenlets we spawn to process_instances for error handling
self._spawned_proc_to_process = {}
# Effective execution engine config (after merging in child process overrides)
self.ee_cfg = self._get_execution_engine_config()
# Process dispatcher (if configured/enabled and not a child container process)
self.pd_cfg = CFG.get_safe("service.process_dispatcher") or {}
self.pd_enabled = self.pd_cfg.get("enabled", False) is True and not self.ee_cfg["container"]["is_child"]
self.pd_core = None
self.event_pub = EventPublisher()
self.publish_events = CFG.get_safe("container.process.publish_events") is True
# Passive manager for simple threads/greenlets, to keep them registered (these are not OS threads)
# Note that each ION process has its own thread manager, so this is for container level threads
self.thread_manager = ThreadManager(heartbeat_secs=None, failure_notify_callback=None)
# Active supervisor for ION processes
self.proc_sup = IonProcessThreadManager(heartbeat_secs=CFG.get_safe("container.timeout.heartbeat"),
failure_notify_callback=self._spawned_proc_failed)
# list of callbacks for process state changes
self._proc_state_change_callbacks = []
def start(self):
log.debug("ProcManager starting ...")
if self.pd_enabled:
self._start_process_dispatcher()
self.proc_sup.start()
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Register container as resource object
cc_obj = self._get_capability_container_object()
self.cc_id, _ = self.container.resource_registry.create(cc_obj)
# Create an association to an Org object if not the rot ION org and only if found
if CFG.get_safe("container.org_name") != CFG.get_safe("system.root_org"):
org, _ = self.container.resource_registry.find_resources(
restype=RT.Org, name=CFG.get_safe("container.org_name"), id_only=True)
if org:
self.container.resource_registry.create_association(org[0], PRED.hasResource, self.cc_id) # TODO - replace with proper association
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
# Call quit on procs to give them ability to clean up in reverse order
procs_list = sorted(self.procs.values(), key=lambda proc: proc._proc_start_time, reverse=True)
for proc in procs_list:
try:
self.terminate_process(proc.id)
except Exception as ex:
log.warn("Failed to terminate process (%s): %s", proc.id, ex)
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.get_safe("container.timeout.shutdown"))
if self.procs:
log.warn("ProcManager procs not empty: %s", self.procs)
if self.procs_by_name:
log.warn("ProcManager procs_by_name not empty: %s", self.procs_by_name)
# Remove Resource registration
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
self.container.resource_registry.delete(self.cc_id, del_associations=True)
except NotFound:
# already gone, this is ok
pass
if self.pd_enabled:
self._stop_process_dispatcher()
log.debug("ProcManager stopped, OK.")
def _get_execution_engine_config(self):
ee_base_cfg = CFG.get_safe("container.execution_engine") or {}
if ee_base_cfg.get("type", None) != "scioncc":
raise ContainerConfigError("Execution engine config invalid: %s", ee_base_cfg)
ee_cfg = deepcopy(ee_base_cfg)
# If we are a child process, merge in child config override
proc_name = multiprocessing.current_process().name
ee_cfg["container"] = dict(child_proc_name=proc_name, is_child=False)
child_cfgs = ee_base_cfg.get("child_configs", None) or {}
if proc_name.startswith("Container-child-"):
ee_cfg["container"]["is_child"] = True
if proc_name in child_cfgs:
log.info("Applying execution engine config override for child: %s", proc_name)
dict_merge(ee_cfg, child_cfgs[proc_name], inplace=True)
else:
for cfg_name, ch_cfg in child_cfgs.iteritems():
pattern = ch_cfg.get("name_pattern", None)
if pattern and re.match(pattern, proc_name):
log.info("Applying execution engine config override %s for child: %s", cfg_name, proc_name)
dict_merge(ee_cfg, ch_cfg, inplace=True)
break
ee_cfg.pop("child_configs", None)
return ee_cfg
def _get_capability_container_object(self):
container_info = dict(proc_name=multiprocessing.current_process().name,
process_id=os.getpid(),
parent_process_id=os.getppid(),
hostname=socket.gethostname(),
host=socket.gethostbyname(socket.gethostname()),
platform=sys.platform,
argv=sys.argv,
python_version=sys.version,
cwd=os.getcwd(),
start_time=self.container.start_time,
)
# Other possibilities: username, os package versions, IP address
host_info = {k: v for (k, v) in zip(("os_sysname", "os_nodename", "os_release", "os_version", "os_machine"), os.uname())}
container_info.update(host_info)
container_info["env"] = {k: str(v) for (k,v) in os.environ.iteritems()}
container_info["python_path"] = sys.path
cc_obj = CapabilityContainer(name=self.container.id, version=self.container.version,
cc_agent=self.container.name,
container_info=container_info,
execution_engine_config=self.ee_cfg)
return cc_obj
# -----------------------------------------------------------------
def spawn_process(self, name=None, module=None, cls=None, config=None, process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" % process_id)
# PROCESS ID. Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id, self.proc_id_pool.get_id())
log.debug("ProcManager.spawn_process(name=%s, module.cls=%s.%s, config=%s) as pid=%s", name, module, cls, config, process_id)
# CONFIG
process_cfg = self._create_process_config(config)
try:
service_cls = named_any("%s.%s" % (module, cls))
except AttributeError as ae:
# Try to nail down the error
import importlib
importlib.import_module(module)
raise
# PROCESS TYPE. Determines basic process context (messaging, service interface)
process_type = get_safe(process_cfg, "process.type") or getattr(service_cls, "process_type", PROCTYPE_SERVICE)
process_start_mode = get_safe(config, "process.start_mode")
process_instance = None
# alert we have a spawning process, but we don't have the instance yet, so give the class instead (more accurate than name)
# Note: this uses a str as first argument instead of a process instance
self._call_proc_state_changed("%s.%s" % (module, cls), ProcessStateEnum.PENDING)
try:
# Additional attributes to set with the process instance
proc_attr = {"_proc_type": process_type,
"_proc_spawn_cfg": config
}
# SPAWN. Determined by type
if process_type == PROCTYPE_SERVICE:
process_instance = self._spawn_service_process(process_id, name, module, cls, process_cfg, proc_attr)
elif process_type == PROCTYPE_STREAMPROC:
process_instance = self._spawn_stream_process(process_id, name, module, cls, process_cfg, proc_attr)
elif process_type == PROCTYPE_AGENT:
process_instance = self._spawn_agent_process(process_id, name, module, cls, process_cfg, proc_attr)
elif process_type == PROCTYPE_STANDALONE:
process_instance = self._spawn_standalone_process(process_id, name, module, cls, process_cfg, proc_attr)
elif process_type == PROCTYPE_IMMEDIATE:
process_instance = self._spawn_immediate_process(process_id, name, module, cls, process_cfg, proc_attr)
elif process_type == PROCTYPE_SIMPLE:
process_instance = self._spawn_simple_process(process_id, name, module, cls, process_cfg, proc_attr)
else:
raise BadRequest("Unknown process type: %s" % process_type)
# REGISTER.
self._register_process(process_instance, name)
process_instance.errcause = "OK"
log.info("ProcManager.spawn_process: %s.%s -> pid=%s OK", module, cls, process_id)
if process_type == PROCTYPE_IMMEDIATE:
log.debug('Terminating immediate process: %s', process_instance.id)
self.terminate_process(process_instance.id)
# Terminate process also triggers TERMINATING/TERMINATED
self._call_proc_state_changed(process_instance, ProcessStateEnum.EXITED)
else:
# Update local policies for the new process
if self.container.has_capability(self.container.CCAP.GOVERNANCE_CONTROLLER):
self.container.governance_controller.update_process_policies(
process_instance, safe_mode=True, force_update=False)
return process_instance.id
except IonProcessError:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
return None
except Exception:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
# trigger failed notification - catches problems in init/start
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
def _create_process_config(self, config):
""" Prepare the config for the new process. Clone system config and apply process overrides.
Support including config by reference of a resource attribute or object from object store.
"""
process_cfg = deepcopy(CFG)
if config:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
if config.get_safe("process.config_ref"):
# Use a reference
config_ref = config.get_safe("process.config_ref")
log.info("Enhancing new process spawn config from ref=%s" % config_ref)
matches = re.match(r'^([A-Za-z]+):([A-Za-z0-9_\.]+)/(.*)$', config_ref)
if matches:
ref_type, ref_id, ref_ext = matches.groups()
if ref_type == "resources":
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
obj = self.container.resource_registry.read(ref_id)
if obj and hasattr(obj, ref_ext):
ref_config = getattr(obj, ref_ext)
if isinstance(ref_config, dict):
dict_merge(process_cfg, ref_config, inplace=True)
else:
raise BadRequest("config_ref %s exists but not dict" % config_ref)
else:
raise BadRequest("config_ref %s - attribute not found" % config_ref)
except NotFound as nf:
log.warn("config_ref %s - object not found" % config_ref)
raise
else:
log.error("Container missing RESOURCE_REGISTRY capability to resolve process config ref %s" % config_ref)
elif ref_type == "objects":
if self.container.has_capability(self.container.CCAP.OBJECT_STORE):
try:
obj = self.container.object_store.read_doc(ref_id)
ref_config = obj
if ref_ext:
ref_config = get_safe(obj, ref_ext, None)
if ref_config is None:
raise BadRequest("config_ref %s - attribute not found" % config_ref)
if isinstance(ref_config, dict):
dict_merge(process_cfg, ref_config, inplace=True)
else:
raise BadRequest("config_ref %s exists but not dict" % config_ref)
except NotFound as nf:
log.warn("config_ref %s - object not found" % config_ref)
raise
else:
log.error("Container missing OBJECT_STORE capability to resolve process config ref %s" % config_ref)
else:
raise BadRequest("Unknown reference type in: %s" % config_ref)
dict_merge(process_cfg, config, inplace=True)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(process_cfg, self.container.spawn_args, inplace=True)
#log.debug("spawn_process() pid=%s process_cfg=%s", process_id, process_cfg)
return process_cfg
def list_local_processes(self, process_type=''):
""" Returns a list of the running ION processes in the container or filtered by the process_type
"""
if not process_type:
return self.procs.values()
return [p for p in self.procs.itervalues() if p.process_type == process_type]
def get_a_local_process(self, proc_name=''):
""" Returns a running ION process in the container for the specified process name
"""
for p in self.procs.itervalues():
if p.name == proc_name:
return p
if p.process_type == PROCTYPE_AGENT and p.resource_type == proc_name:
return p
return None
def get_local_service_processes(self, service_name=''):
""" Returns a list of running ION processes in the container for the specified service name
"""
proc_list = [p for p in self.procs.itervalues() if p.process_type == PROCTYPE_SERVICE and p.name == service_name]
return proc_list
def is_local_service_process(self, service_name):
local_services = self.list_local_processes(PROCTYPE_SERVICE)
for p in local_services:
if p.name == service_name:
return True
return False
def is_local_agent_process(self, resource_type):
local_agents = self.list_local_processes(PROCTYPE_AGENT)
for p in local_agents:
if p.resource_type == resource_type:
return True
return False
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s, %s", gproc, gproc.exception)
prc = self._spawned_proc_to_process.get(gproc, None)
# stop the rest of the process
if prc is not None:
try:
self.terminate_process(prc.id, False)
except Exception as e:
log.warn("Problem while stopping rest of failed process %s: %s", prc, e)
finally:
self._call_proc_state_changed(prc, ProcessStateEnum.FAILED)
else:
log.warn("No ION process found for failed proc manager child: %s", gproc)
# Stop the container if this was the last process
if not self.procs and CFG.get_safe("container.process.exit_once_empty", False):
self.container.fail_fast("Terminating container after last process (%s) failed: %s" % (gproc, gproc.exception))
def add_proc_state_changed_callback(self, cb):
"""
Adds a callback to be called when a process' state changes.
The callback should take three parameters: The process, the state, and the container.
"""
self._proc_state_change_callbacks.append(cb)
def remove_proc_state_changed_callback(self, cb):
"""
Removes a callback from the process state change callback list.
If the callback is not registered, this method does nothing.
"""
if cb in self._proc_state_change_callbacks:
self._proc_state_change_callbacks.remove(cb)
def _call_proc_state_changed(self, svc, state):
"""
Internal method to call all registered process state change callbacks.
"""
#log.debug("Proc State Changed (%s): %s", ProcessStateEnum._str_map.get(state, state), svc)
for cb in self._proc_state_change_callbacks:
cb(svc, state, self.container)
# Trigger event
if self.publish_events:
self._publish_process_event(svc, state)
def _create_listening_endpoint(self, **kwargs):
"""
Creates a listening endpoint for spawning processes.
This method exists to be able to override the type created via configuration.
In most cases it will create a ProcessRPCServer.
"""
eptypestr = CFG.get_safe('container.messaging.endpoint.proc_listening_type', None)
if eptypestr is not None:
module, cls = eptypestr.rsplit('.', 1)
mod = __import__(module, fromlist=[cls])
eptype = getattr(mod, cls)
ep = eptype(**kwargs)
else:
ep = ProcessRPCServer(**kwargs)
return ep
def _add_process_publishers(self, process_instance, config):
# Add publishers if declared...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance, publish_streams)
return pub_names
# -----------------------------------------------------------------
# PROCESS TYPE: service
# - has service listen binding/queue and RPC interface
def _spawn_service_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
listen_name = get_safe(config, "process.listen_name") or process_instance.name
listen_name_xo = self.container.create_service_xn(listen_name)
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
# Service RPC endpoint
rsvc1 = self._create_listening_endpoint(node=self.container.node,
from_name=listen_name_xo,
process=process_instance)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc1],
proc_name=process_instance._proc_name)
proc.proc._glname = "ION Proc %s" % process_instance._proc_name
self.proc_sup.ensure_ready(proc, "_spawn_service_process for %s" % ",".join((str(listen_name), process_instance.id)))
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
# - has stream listen binding/queue
# - has publishers if declared
def _spawn_stream_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
listeners = []
# Stream listener
listen_name = get_safe(config, "process.listen_name") or name
log.debug("Stream Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
process_instance.stream_subscriber = StreamSubscriber(process=process_instance, exchange_name=listen_name,
callback=process_instance.call_process)
listeners.append(process_instance.stream_subscriber)
pub_names = self._add_process_publishers(process_instance, config)
# Private PID listener
# pid_listener_xo = self.container.create_process_xn(process_instance.id)
# rsvc = self._create_listening_endpoint(node=self.container.node,
# from_name=pid_listener_xo,
# process=process_instance)
# listeners.append(rsvc)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=listeners,
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
proc.proc._glname = "ION Proc %s" % process_instance._proc_name
self.proc_sup.ensure_ready(proc, "_spawn_stream_process for %s" % process_instance._proc_name)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
# - has resource ID (or if non-existent PID) listen binding/queue
# - has RPC interface
def _spawn_agent_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
if not isinstance(process_instance, ResourceAgent):
raise ContainerConfigError("Agent process must extend ResourceAgent")
listeners = []
# Set the resource ID if we get it through the config
resource_id = get_safe(process_instance.CFG, "agent.resource_id")
if resource_id:
process_instance.resource_id = resource_id
# Resource ID listener
resource_id_xo = self.container.create_process_xn(resource_id)
alistener = self._create_listening_endpoint(node=self.container.node,
from_name=resource_id_xo,
process=process_instance)
listeners.append(alistener)
else:
# Private PID listener
pid_listener_xo = self.container.create_process_xn(process_instance.id)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=pid_listener_xo,
process=process_instance)
listeners.append(rsvc)
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=listeners,
proc_name=process_instance._proc_name)
proc.proc._glname = "ION Proc %s" % process_instance._proc_name
self.proc_sup.ensure_ready(proc, "_spawn_agent_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
# Now call the on_init of the agent.
self._process_init(process_instance)
if not process_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
if not process_instance.resource_id:
log.warn("Agent process id=%s does not define resource_id!!" % process_instance.id)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
# - has PID binding/queue with RPC interface
# - has publishers if declared
def _spawn_standalone_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
# Private PID listener
pid_listener_xo = self.container.create_process_xn(process_instance.id, auto_delete=True)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=pid_listener_xo,
process=process_instance)
pub_names = self._add_process_publishers(process_instance, config)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
proc.proc._glname = "ION Proc %s" % process_instance._proc_name
self.proc_sup.ensure_ready(proc, "_spawn_standalone_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
# - has publishers if declared
def _spawn_simple_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as simple process.
No attachments.
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
pub_names = self._add_process_publishers(process_instance, config)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
proc.proc._glname = "ION Proc %s" % process_instance._proc_name
self.proc_sup.ensure_ready(proc, "_spawn_simple_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
# - will not be registered
# - will be terminated right after start
def _spawn_immediate_process(self, process_id, name, module, cls, config, proc_attr):
"""
Spawn a process acting as immediate one off process.
No messaging attachments.
"""
process_instance = self._create_app_instance(process_id, name, module, cls, config, proc_attr)
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
# -----------------------------------------------------------------
def _create_app_instance(self, process_id, name, module, cls, config, proc_attr):
"""
Creates an instance of a BaseService, representing the app logic of a ION process.
This is independent of the process type service, agent, standalone, etc.
"""
# APP INSTANCE.
app_instance = for_name(module, cls)
if not isinstance(app_instance, BaseService):
raise ContainerConfigError("Instantiated service not a BaseService %r" % app_instance)
# Set BaseService instance common attributes
app_instance.errcause = ""
app_instance.id = process_id
app_instance.container = self.container
app_instance.CFG = config
app_instance._proc_name = name
app_instance._proc_start_time = time.time()
for att, att_val in proc_attr.iteritems():
setattr(app_instance, att, att_val)
# Unless the process has been started as part of another Org, default to the container Org or the ION Org
if 'org_governance_name' in config:
app_instance.org_governance_name = config['org_governance_name']
else:
app_instance.org_governance_name = CFG.get_safe('container.org_name', CFG.get_safe('system.root_org', 'ION'))
# Add process state management, if applicable
self._add_process_state(app_instance)
# Check dependencies (RPC clients)
self._check_process_dependencies(app_instance)
return app_instance
def _add_process_state(self, process_instance):
""" Add stateful process operations, if applicable
"""
# Only applies if the process implements stateful interface
if hasattr(process_instance, "_flush_state"):
def _flush_state():
with process_instance._state_lock:
state_obj = process_instance.container.state_repository.put_state(process_instance.id, process_instance._proc_state,
state_obj=process_instance._proc_state_obj)
state_obj.state = None # Make sure memory footprint is low for larger states
process_instance._proc_state_obj = state_obj
process_instance._proc_state_changed = False
def _load_state():
if not hasattr(process_instance, "_proc_state"):
process_instance._proc_state = {}
try:
with process_instance._state_lock:
new_state, state_obj = process_instance.container.state_repository.get_state(process_instance.id)
process_instance._proc_state.clear()
process_instance._proc_state.update(new_state)
process_instance._proc_state_obj = state_obj
process_instance._proc_state_changed = False
except NotFound as nf:
log.debug("No persisted state available for process %s", process_instance.id)
except Exception as ex:
log.warn("Process %s load state failed: %s", process_instance.id, str(ex))
process_instance._flush_state = _flush_state
process_instance._load_state = _load_state
process_instance._state_lock = RLock()
process_instance._proc_state = {}
process_instance._proc_state_obj = None
process_instance._proc_state_changed = False
# PROCESS RESTART: Need to check whether this process had persisted state.
# Note: This could happen anytime during a system run, not just on RESTART boot
log.debug("Loading persisted state for process %s", process_instance.id)
process_instance._load_state()
def _check_process_dependencies(self, app_instance):
app_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s", app_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in app_instance.dependencies:
client = getattr(app_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = app_instance
client.node = self.container.node
# Ensure that dep actually exists and is running?
def _process_init(self, process_instance):
""" Initialize the process, primarily by calling on_init()
"""
process_instance.errcause = "initializing service"
process_instance.init()
def _process_start(self, process_instance):
""" Start the process, primarily by calling on_start()
"""
# Should this be after spawn_process?
# Should we check for timeout?
process_instance.errcause = "starting service"
process_instance.start()
def _process_quit(self, process_instance):
""" Common method to handle process stopping.
"""
process_instance.errcause = "quitting process"
# Give the process notice to quit doing stuff.
process_instance.quit()
# Terminate IonProcessThread (may not have one, i.e. simple process)
# @TODO: move this into process' on_quit()
if getattr(process_instance, '_process', None) is not None and process_instance._process:
process_instance._process.notify_stop()
process_instance._process.stop()
def _set_publisher_endpoints(self, process_instance, publisher_streams=None):
""" Creates and attaches named stream publishers
"""
publisher_streams = publisher_streams or {}
names = []
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = StreamPublisher(process=process_instance, stream_id=stream_id)
setattr(process_instance, name, pub)
names.append(name)
return names
def _register_process(self, process_instance, name):
"""
Performs all actions related to registering the new process in the system.
Also performs process type specific registration, such as for services and agents
"""
# Add process instance to container's process dict
if name in self.procs_by_name:
log.warn("Process name already registered in container: %s" % name)
self.procs_by_name[name] = process_instance
self.procs[process_instance.id] = process_instance
# Add Process to resource registry
process_instance.errcause = "registering"
if process_instance._proc_type != PROCTYPE_IMMEDIATE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
proc_obj = Process(name=process_instance.id, label=name,
process_type=process_instance._proc_type,
service_name=getattr(process_instance, "name", None) or "",
process_state=ProcessStateEnum.RUNNING)
proc_id, _ = self.container.resource_registry.create(proc_obj)
process_instance._proc_res_id = proc_id
# Associate process with container resource
self.container.resource_registry.create_association(self.cc_id, PRED.hasProcess, proc_id)
else:
process_instance._proc_res_id = None
# Process type specific registration
if process_instance._proc_type == PROCTYPE_SERVICE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Registration of SERVICE process: in resource registry
service_list, _ = self.container.resource_registry.find_resources(
restype=RT.Service, name=process_instance.name, id_only=True)
if service_list:
process_instance._proc_svc_id = service_list[0]
if len(service_list) > 1:
log.warn("More than 1 Service resource found with name %s: %s", process_instance.name, service_list)
else:
# We are starting the first process of a service instance
# TODO: This should be created by the HA Service agent in the future
svc_obj = Service(name=process_instance.name, exchange_name=process_instance._proc_listen_name,
state=ServiceStateEnum.READY)
process_instance._proc_svc_id, _ = self.container.resource_registry.create(svc_obj)
# Create association to service definition resource
svcdef_list, _ = self.container.resource_registry.find_resources(
restype=RT.ServiceDefinition, name=process_instance.name, id_only=True)
if svcdef_list:
if len(svcdef_list) > 1:
log.warn("More than 1 ServiceDefinition resource found with name %s: %s", process_instance.name, svcdef_list)
self.container.resource_registry.create_association(
process_instance._proc_svc_id, PRED.hasServiceDefinition, svcdef_list[0])
else:
log.error("Cannot find ServiceDefinition resource for %s", process_instance.name)
self.container.resource_registry.create_association(
process_instance._proc_svc_id, PRED.hasProcess, proc_id)
elif process_instance._proc_type == PROCTYPE_AGENT:
if self.container.has_capability(self.container.CCAP.DIRECTORY):
# Registration of AGENT process: in Directory
caps = process_instance.get_capabilities()
self.container.directory.register("/Agents", process_instance.id,
**dict(name=process_instance._proc_name,
container=process_instance.container.id,
resource_id=process_instance.resource_id,
agent_id=process_instance.agent_id,
def_id=process_instance.agent_def_id,
capabilities=caps))
self._call_proc_state_changed(process_instance, ProcessStateEnum.RUNNING)
def terminate_process(self, process_id, do_notifications=True):
"""
Terminates a process and all its resources. Termination is graceful with timeout.
@param process_id The id of the process to terminate. Should exist in the container's
list of processes or this will raise.
@param do_notifications If True, emits process state changes for TERMINATING and TERMINATED.
If False, supresses any state changes. Used near EXITED and FAILED.
"""
process_instance = self.procs.get(process_id, None)
if not process_instance:
raise BadRequest("Cannot terminate. Process id='%s' unknown on container id='%s'" % (
process_id, self.container.id))
log.info("ProcManager.terminate_process: %s -> pid=%s", process_instance._proc_name, process_id)
if do_notifications:
self._call_proc_state_changed(process_instance, ProcessStateEnum.TERMINATING)
self._process_quit(process_instance)
self._unregister_process(process_id, process_instance)
if do_notifications:
self._call_proc_state_changed(process_instance, ProcessStateEnum.TERMINATED)
def _unregister_process(self, process_id, process_instance):
# Remove process registration in resource registry
if process_instance._proc_res_id:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
self.container.resource_registry.delete(process_instance._proc_res_id, del_associations=True)
except NotFound:
# OK if already gone
pass
except Exception as ex:
log.exception(ex)
pass
# Cleanup for specific process types
if process_instance._proc_type == PROCTYPE_SERVICE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Check if this is the last process for this service and do auto delete service resources here
svcproc_list, _ = self.container.resource_registry.find_objects(
process_instance._proc_svc_id, PRED.hasProcess, RT.Process, id_only=True)
if not svcproc_list:
try:
self.container.resource_registry.delete(process_instance._proc_svc_id, del_associations=True)
except NotFound:
# OK if already gone
pass
except Exception as ex:
log.exception(ex)
pass
elif process_instance._proc_type == PROCTYPE_AGENT:
if self.container.has_capability(self.container.CCAP.DIRECTORY):
self.container.directory.unregister_safe("/Agents", process_instance.id)
# Remove internal registration in container
del self.procs[process_id]
if process_instance._proc_name in self.procs_by_name:
del self.procs_by_name[process_instance._proc_name]
else:
log.warn("Process name %s not in local registry", process_instance.name)
def _publish_process_event(self, proc_inst, state):
sub_type = ProcessStateEnum._str_map.get(state, state)
if isinstance(proc_inst, basestring):
# self.event_pub.publish_event(event_type=OT.ProcessLifecycleEvent,
# origin=proc_inst, origin_type=RT.Process, sub_type=sub_type,
# state=state,
# container_id=self.container.id,
# process_type="", process_name=proc_inst,
# process_resource_id="", service_name="")
# This is a PENDING process without process_id
pass
else:
try:
self.event_pub.publish_event(event_type=OT.ProcessLifecycleEvent,
origin=getattr(proc_inst, "id", "PD"), origin_type=RT.Process, sub_type=sub_type,
state=state,
container_id=self.container.id,
process_type=getattr(proc_inst, "_proc_type", ""),
process_name=getattr(proc_inst, "_proc_name", ""),
process_resource_id=getattr(proc_inst, "_proc_res_id", ""),
service_name=getattr(proc_inst, "name", ""))
except Exception:
log.exception("Could not publish process event")
# -----------------------------------------------------------------
def _start_process_dispatcher(self):
from ion.core.process.pd_core import ProcessDispatcher
self.pd_core = ProcessDispatcher(container=self.container, config=self.pd_cfg)
self.pd_core.start()
def _stop_process_dispatcher(self):
if self.pd_core:
self.pd_core.stop()
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to process_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(heartbeat_secs=CFG.cc.timeout.heartbeat, failure_notify_callback=self._spawned_proc_failed)
# list of callbacks for process state changes
self._proc_state_change_callbacks = []
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Register container as resource object
cc_obj = CapabilityContainer(name=self.container.id, cc_agent=self.container.name)
self.cc_id, _ = self.container.resource_registry.create(cc_obj)
#Create an association to an Org object if not the rot ION org and only if found
if CFG.container.org_name and CFG.container.org_name != CFG.system.root_org:
org, _ = self.container.resource_registry.find_resources(restype=RT.Org, name=CFG.container.org_name, id_only=True)
if org:
self.container.resource_registry.create_association(org[0], PRED.hasResource, self.cc_id) # TODO - replace with proper association
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
procs_list = sorted(self.procs.values(), key=lambda proc: proc._proc_start_time, reverse=True)
for proc in procs_list:
try:
self.terminate_process(proc.id)
except Exception as ex:
log.warn("Failed to terminate process (%s): %s", proc.id, ex)
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
if self.procs:
log.warn("ProcManager procs not empty: %s", self.procs)
if self.procs_by_name:
log.warn("ProcManager procs_by_name not empty: %s", self.procs_by_name)
# Remove Resource registration
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
self.container.resource_registry.delete(self.cc_id, del_associations=True)
except NotFound:
# already gone, this is ok
pass
# TODO: Check associations to processes
log.debug("ProcManager stopped, OK.")
def spawn_process(self, name=None, module=None, cls=None, config=None, process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" % process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id, self.proc_id_pool.get_id())
log.debug("ProcManager.spawn_process(name=%s, module.cls=%s.%s, config=%s) as pid=%s", name, module, cls, config, process_id)
process_cfg = deepcopy(CFG)
if config:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
if config.get_safe("process.config_ref"):
# Use a reference
config_ref = config.get_safe("process.config_ref")
log.info("Enhancing new process spawn config from ref=%s" % config_ref)
matches = re.match(r'^([A-Za-z]+):([A-Za-z0-9]+)/(.+)$', config_ref)
if matches:
ref_type, ref_id, ref_ext = matches.groups()
if ref_type == "resources":
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
obj = self.container.resource_registry.read(ref_id)
if obj and hasattr(obj, ref_ext):
ref_config = getattr(obj, ref_ext)
if isinstance(ref_config, dict):
dict_merge(process_cfg, ref_config, inplace=True)
else:
raise BadRequest("config_ref %s exists but not dict" % config_ref)
else:
raise BadRequest("config_ref %s - attribute not found" % config_ref)
except NotFound as nf:
log.warn("config_ref %s - object not found" % config_ref)
raise
else:
log.error("Container missing RESOURCE_REGISTRY capability to resolve process config ref %s" % config_ref)
else:
raise BadRequest("Unknown reference type in: %s" % config_ref)
dict_merge(process_cfg, config, inplace=True)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(process_cfg, self.container.spawn_args, inplace=True)
#log.debug("spawn_process() pid=%s process_cfg=%s", process_id, process_cfg)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of the constants defined at the top of this file
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(process_cfg, "process.type") or getattr(service_cls, "process_type", "service")
process_start_mode = get_safe(config, "process.start_mode")
process_instance = None
# alert we have a spawning process, but we don't have the instance yet, so give the class instead (more accurate than name)
self._call_proc_state_changed("%s.%s" % (module, cls), ProcessStateEnum.PENDING)
try:
# spawn service by type
if process_type == SERVICE_PROCESS_TYPE:
process_instance = self._spawn_service_process(process_id, name, module, cls, process_cfg)
elif process_type == STREAM_PROCESS_TYPE:
process_instance = self._spawn_stream_process(process_id, name, module, cls, process_cfg)
elif process_type == AGENT_PROCESS_TYPE:
process_instance = self._spawn_agent_process(process_id, name, module, cls, process_cfg)
elif process_type == STANDALONE_PROCESS_TYPE:
process_instance = self._spawn_standalone_process(process_id, name, module, cls, process_cfg)
elif process_type == IMMEDIATE_PROCESS_TYPE:
process_instance = self._spawn_immediate_process(process_id, name, module, cls, process_cfg)
elif process_type == SIMPLE_PROCESS_TYPE:
process_instance = self._spawn_simple_process(process_id, name, module, cls, process_cfg)
else:
raise BadRequest("Unknown process type: %s" % process_type)
process_instance._proc_type = process_type
self._register_process(process_instance, name)
process_instance.errcause = "OK"
log.info("ProcManager.spawn_process: %s.%s -> pid=%s OK", module, cls, process_id)
if process_type == IMMEDIATE_PROCESS_TYPE:
log.info('Terminating immediate process: %s', process_instance.id)
self.terminate_process(process_instance.id)
# terminate process also triggers TERMINATING/TERMINATED
self._call_proc_state_changed(process_instance, ProcessStateEnum.EXITED)
else:
#Update local policies for the new process
if self.container.has_capability(self.container.CCAP.GOVERNANCE_CONTROLLER):
self.container.governance_controller.update_container_policies(process_instance, safe_mode=True)
return process_instance.id
except IonProcessError:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
return None
except Exception:
errcause = process_instance.errcause if process_instance else "instantiating process"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
# trigger failed notification - catches problems in init/start
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
def list_local_processes(self, process_type=''):
"""
Returns a list of the running ION processes in the container or filtered by the process_type
"""
if not process_type:
return self.procs.values()
return [p for p in self.procs.itervalues() if p.process_type == process_type]
def get_a_local_process(self, proc_name=''):
"""
Returns a running ION processes in the container for the specified name
"""
for p in self.procs.itervalues():
if p.name == proc_name:
return p
if p.process_type == AGENT_PROCESS_TYPE and p.resource_type == proc_name:
return p
return None
def is_local_service_process(self, service_name):
local_services = self.list_local_processes(SERVICE_PROCESS_TYPE)
for p in local_services:
if p.name == service_name:
return True
return False
def is_local_agent_process(self, resource_type):
local_agents = self.list_local_processes(AGENT_PROCESS_TYPE)
for p in local_agents:
if p.resource_type == resource_type:
return True
return False
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s, %s", gproc, gproc.exception)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
prc = self._spawned_proc_to_process.get(gproc, None)
#
# # make sure prc is in our list
# if not prc in self.procs.values():
# log.warn("prc %s not found in procs list", prc)
# return
# stop the rest of the process
if prc is not None:
try:
self.terminate_process(prc.id, False)
except Exception as e:
log.warn("Problem while stopping rest of failed process %s: %s", prc, e)
finally:
self._call_proc_state_changed(prc, ProcessStateEnum.FAILED)
else:
log.warn("No ION process found for failed proc manager child: %s", gproc)
#self.container.fail_fast("Container process (%s) failed: %s" % (svc, gproc.exception))
# Stop the container if this was the last process
if not self.procs and CFG.get_safe("container.processes.exit_once_empty", False):
self.container.fail_fast("Terminating container after last process (%s) failed: %s" % (gproc, gproc.exception))
def _cleanup_method(self, queue_name, ep=None):
"""
Common method to be passed to each spawned ION process to clean up their process-queue.
@TODO Leaks implementation detail, should be using XOs
"""
if ep._chan is not None and not ep._chan._queue_auto_delete:
# only need to delete if AMQP didn't handle it for us already!
# @TODO this will not work with XOs (future)
try:
ch = self.container.node.channel(RecvChannel)
ch._recv_name = NameTrio(get_sys_name(), "%s.%s" % (get_sys_name(), queue_name))
ch._destroy_queue()
except TransportError as ex:
log.warn("Cleanup method triggered an error, ignoring: %s", ex)
def add_proc_state_changed_callback(self, cb):
"""
Adds a callback to be called when a process' state changes.
The callback should take three parameters: The process, the state, and the container.
"""
self._proc_state_change_callbacks.append(cb)
def remove_proc_state_changed_callback(self, cb):
"""
Removes a callback from the process state change callback list.
If the callback is not registered, this method does nothing.
"""
if cb in self._proc_state_change_callbacks:
self._proc_state_change_callbacks.remove(cb)
def _call_proc_state_changed(self, svc, state):
"""
Internal method to call all registered process state change callbacks.
"""
log.debug("Proc State Changed (%s): %s", ProcessStateEnum._str_map.get(state, state), svc)
for cb in self._proc_state_change_callbacks:
cb(svc, state, self.container)
def _create_listening_endpoint(self, **kwargs):
"""
Creates a listening endpoint for spawning processes.
This method exists to be able to override the type created via configuration.
In most cases it will create a ConversationRPCServer.
"""
eptypestr = CFG.get_safe('container.messaging.endpoint.proc_listening_type', None)
if eptypestr is not None:
module, cls = eptypestr.rsplit('.', 1)
mod = __import__(module, fromlist=[cls])
eptype = getattr(mod, cls)
ep = eptype(**kwargs)
else:
conv_enabled = CFG.get_safe('container.messaging.endpoint.rpc_conversation_enabled', False)
if conv_enabled:
ep = ConversationRPCServer(**kwargs)
else:
ep = ProcessRPCServer(**kwargs)
return ep
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or process_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
# Service RPC endpoint
rsvc1 = self._create_listening_endpoint(node=self.container.node,
from_name=listen_name,
process=process_instance)
# Named local RPC endpoint
rsvc2 = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
process=process_instance)
# cleanup method to delete process queue
cleanup = lambda _: self._cleanup_method(process_instance.id, rsvc2)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc1, rsvc2],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_service_process for %s" % ",".join((listen_name, process_instance.id)))
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or name
log.debug("Stream Process (%s) listen_name: %s", name, listen_name)
process_instance._proc_listen_name = listen_name
process_instance.stream_subscriber = StreamSubscriber(process=process_instance, exchange_name=listen_name, callback=process_instance.call_process)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance, publish_streams)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
process=process_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
self._cleanup_method(process_instance.id, rsvc)
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc, process_instance.stream_subscriber],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_stream_process for %s" % process_instance._proc_name)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
if not isinstance(process_instance, ResourceAgent) and not isinstance(process_instance, SimpleResourceAgent):
raise ContainerConfigError("Agent process must extend ResourceAgent")
listeners = []
# Set the resource ID if we get it through the config
resource_id = get_safe(process_instance.CFG, "agent.resource_id")
if resource_id:
process_instance.resource_id = resource_id
alistener = self._create_listening_endpoint(node=self.container.node,
from_name=resource_id,
process=process_instance)
listeners.append(alistener)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
process=process_instance)
listeners.append(rsvc)
# cleanup method to delete process/agent queue (@TODO: leaks a bit here - should use XOs)
def agent_cleanup(x):
self._cleanup_method(process_instance.id, rsvc)
if resource_id:
self._cleanup_method(resource_id, alistener)
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=listeners,
proc_name=process_instance._proc_name,
cleanup_method=agent_cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_agent_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
# Now call the on_init of the agent.
self._process_init(process_instance)
if not process_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
if not process_instance.resource_id:
log.warn("Agent process id=%s does not define resource_id!!" % process_instance.id)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
rsvc = self._create_listening_endpoint(node=self.container.node,
from_name=process_instance.id,
process=process_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance, publish_streams)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
self._cleanup_method(process_instance.id, rsvc)
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[rsvc],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_standalone_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
try:
proc.start_listeners()
except IonProcessError:
self._process_quit(process_instance)
self._call_proc_state_changed(process_instance, ProcessStateEnum.FAILED)
raise
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
pub_names = self._set_publisher_endpoints(process_instance, publish_streams)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
def cleanup(*args):
for name in pub_names:
p = getattr(process_instance, name)
p.close()
proc = self.proc_sup.spawn(name=process_instance.id,
service=process_instance,
listeners=[],
proc_name=process_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_simple_process for %s" % process_instance.id)
# map gproc to process_instance
self._spawned_proc_to_process[proc.proc] = process_instance
# set service's reference to process
process_instance._process = proc
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
process_instance = self._create_process_instance(process_id, name, module, cls, config)
self._process_init(process_instance)
self._process_start(process_instance)
return process_instance
def _create_process_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
process_instance = for_name(module, cls)
if not isinstance(process_instance, BaseService):
raise ContainerConfigError("Instantiated service not a BaseService %r" % process_instance)
# Prepare service instance
process_instance.errcause = ""
process_instance.id = process_id
process_instance.container = self.container
process_instance.CFG = config
process_instance._proc_name = name
process_instance._proc_start_time = time.time()
#Unless the process has been started as part of another Org, default to the container Org or the ION Org
if config.has_key('org_governance_name'):
process_instance.org_governance_name = config['org_governance_name']
else:
process_instance.org_governance_name = CFG.get_safe('container.org_name', CFG.get_safe('system.root_org', 'ION'))
# Add stateful process operations
if hasattr(process_instance, "_flush_state"):
def _flush_state():
with process_instance._state_lock:
state_obj = process_instance.container.state_repository.put_state(process_instance.id, process_instance._proc_state,
state_obj=process_instance._proc_state_obj)
state_obj.state = None # Make sure memory footprint is low for larger states
process_instance._proc_state_obj = state_obj
process_instance._proc_state_changed = False
def _load_state():
if not hasattr(process_instance, "_proc_state"):
process_instance._proc_state = {}
try:
with process_instance._state_lock:
new_state, state_obj = process_instance.container.state_repository.get_state(process_instance.id)
process_instance._proc_state.clear()
process_instance._proc_state.update(new_state)
process_instance._proc_state_obj = state_obj
process_instance._proc_state_changed = False
except NotFound as nf:
log.debug("No persisted state available for process %s", process_instance.id)
except Exception as ex:
log.warn("Process %s load state failed: %s", process_instance.id, str(ex))
process_instance._flush_state = _flush_state
process_instance._load_state = _load_state
process_instance._state_lock = RLock()
process_instance._proc_state = {}
process_instance._proc_state_obj = None
process_instance._proc_state_changed = False
# PROCESS RESTART: Need to check whether this process had persisted state.
# Note: This could happen anytime during a system run, not just on RESTART boot
log.debug("Loading persisted state for process %s", process_id)
process_instance._load_state()
# start service dependencies (RPC clients)
self._start_process_dependencies(process_instance)
return process_instance
def _start_process_dependencies(self, process_instance):
process_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s", process_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in process_instance.dependencies:
client = getattr(process_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = process_instance
client.node = self.container.node
# ensure that dep actually exists and is running
# MM: commented out - during startup (init actually), we don't need to check for service dependencies
# MM: TODO: split on_init from on_start; start consumer in on_start; check for full queues on restart
# if process_instance.name != 'bootstrap' or (process_instance.name == 'bootstrap' and process_instance.CFG.level == dependency):
# svc_de = self.container.resource_registry.find_resources(restype="Service", name=dependency, id_only=True)
# if not svc_de:
# raise ContainerConfigError("Dependency for service %s not running: %s" % (process_instance.name, dependency))
def _process_init(self, process_instance):
# Init process
process_instance.errcause = "initializing service"
process_instance.init()
def _process_start(self, process_instance):
# Start process
# THIS SHOULD BE CALLED LATER THAN SPAWN
# TODO: Check for timeout
process_instance.errcause = "starting service"
process_instance.start()
def _process_quit(self, process_instance):
"""
Common method to handle process stopping.
"""
process_instance.errcause = "quitting process"
# Give the process notice to quit doing stuff.
process_instance.quit()
# Terminate IonProcessThread (may not have one, i.e. simple process)
# @TODO: move this into process' on_quit()
if getattr(process_instance, '_process', None) is not None and process_instance._process:
process_instance._process.notify_stop()
process_instance._process.stop()
def _set_publisher_endpoints(self, process_instance, publisher_streams=None):
publisher_streams = publisher_streams or {}
names = []
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = StreamPublisher(process=process_instance, stream_id=stream_id)
setattr(process_instance, name, pub)
names.append(name)
return names
def _register_process(self, process_instance, name):
"""
Performs all actions related to registering the new process in the system.
Also performs process type specific registration, such as for services and agents
"""
# Add process instance to container's process dict
if name in self.procs_by_name:
log.warn("Process name already registered in container: %s" % name)
self.procs_by_name[name] = process_instance
self.procs[process_instance.id] = process_instance
# Add Process to resource registry
# Note: In general the Process resource should be created by the CEI PD, but not all processes are CEI
# processes. How to deal with this?
process_instance.errcause = "registering"
if process_instance._proc_type != IMMEDIATE_PROCESS_TYPE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
proc_obj = Process(name=process_instance.id, label=name, proctype=process_instance._proc_type)
proc_id, _ = self.container.resource_registry.create(proc_obj)
process_instance._proc_res_id = proc_id
# Associate process with container resource
self.container.resource_registry.create_association(self.cc_id, "hasProcess", proc_id)
else:
process_instance._proc_res_id = None
# Process type specific registration
# TODO: Factor out into type specific handler functions
if process_instance._proc_type == SERVICE_PROCESS_TYPE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Registration of SERVICE process: in resource registry
service_list, _ = self.container.resource_registry.find_resources(restype="Service", name=process_instance.name, id_only=True)
if service_list:
process_instance._proc_svc_id = service_list[0]
if len(service_list) > 1:
log.warn("More than 1 Service resource found with name %s: %s", process_instance.name, service_list)
else:
# We are starting the first process of a service instance
# TODO: This should be created by the HA Service agent in the future
svc_obj = Service(name=process_instance.name, exchange_name=process_instance._proc_listen_name, state=ServiceStateEnum.READY)
process_instance._proc_svc_id, _ = self.container.resource_registry.create(svc_obj)
# Create association to service definition resource
svcdef_list, _ = self.container.resource_registry.find_resources(restype="ServiceDefinition",
name=process_instance.name, id_only=True)
if svcdef_list:
if len(svcdef_list) > 1:
log.warn("More than 1 ServiceDefinition resource found with name %s: %s", process_instance.name, svcdef_list)
self.container.resource_registry.create_association(process_instance._proc_svc_id,
"hasServiceDefinition", svcdef_list[0])
else:
log.error("Cannot find ServiceDefinition resource for %s", process_instance.name)
self.container.resource_registry.create_association(process_instance._proc_svc_id, "hasProcess", proc_id)
elif process_instance._proc_type == AGENT_PROCESS_TYPE:
if self.container.has_capability(self.container.CCAP.DIRECTORY):
# Registration of AGENT process: in Directory
caps = process_instance.get_capabilities()
self.container.directory.register("/Agents", process_instance.id,
**dict(name=process_instance._proc_name,
container=process_instance.container.id,
resource_id=process_instance.resource_id,
agent_id=process_instance.agent_id,
def_id=process_instance.agent_def_id,
capabilities=caps))
self._call_proc_state_changed(process_instance, ProcessStateEnum.RUNNING)
def terminate_process(self, process_id, do_notifications=True):
"""
Terminates a process and all its resources. Termination is graceful with timeout.
@param process_id The id of the process to terminate. Should exist in the container's
list of processes or this will raise.
@param do_notifications If True, emits process state changes for TERMINATING and TERMINATED.
If False, supresses any state changes. Used near EXITED and FAILED.
"""
process_instance = self.procs.get(process_id, None)
if not process_instance:
raise BadRequest("Cannot terminate. Process id='%s' unknown on container id='%s'" % (
process_id, self.container.id))
log.info("ProcManager.terminate_process: %s -> pid=%s", process_instance._proc_name, process_id)
if do_notifications:
self._call_proc_state_changed(process_instance, ProcessStateEnum.TERMINATING)
self._process_quit(process_instance)
self._unregister_process(process_id, process_instance)
if do_notifications:
self._call_proc_state_changed(process_instance, ProcessStateEnum.TERMINATED)
def _unregister_process(self, process_id, process_instance):
# Remove process registration in resource registry
if process_instance._proc_res_id:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
try:
self.container.resource_registry.delete(process_instance._proc_res_id, del_associations=True)
except NotFound: #, HTTPException):
# if it's already gone, it's already gone!
pass
except Exception, ex:
log.exception(ex)
pass
# Cleanup for specific process types
if process_instance._proc_type == SERVICE_PROCESS_TYPE:
if self.container.has_capability(self.container.CCAP.RESOURCE_REGISTRY):
# Check if this is the last process for this service and do auto delete service resources here
svcproc_list = []
try:
svcproc_list, _ = self.container.resource_registry.find_objects(process_instance._proc_svc_id,
"hasProcess", "Process", id_only=True)
except ResourceNotFound:
# if it's already gone, it's already gone!
pass
if not svcproc_list:
try:
self.container.resource_registry.delete(process_instance._proc_svc_id, del_associations=True)
except NotFound:
# if it's already gone, it's already gone!
pass
except Exception, ex:
log.exception(ex)
pass
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to service_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(heartbeat_secs=CFG.cc.timeout.heartbeat, failure_notify_callback=self._spawned_proc_failed)
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
map(self.terminate_process, self.procs.keys())
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
log.debug("ProcManager stopped, OK.")
def spawn_process(self, name=None, module=None, cls=None, config=None, process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" % process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id, self.proc_id_pool.get_id())
log.debug("ProcManager.spawn_process(name=%s, module.cls=%s.%s) as pid=%s", name, module, cls, process_id)
if not config:
# Use system CFG. It has the command line args in it
config = DictModifier(CFG)
else:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
config = DictModifier(CFG, config)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(config, self.container.spawn_args, inplace=True)
#log.debug("spawn_process() pid=%s config=%s", process_id, config)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of: service, stream_process, agent, simple, immediate
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(config, "process.type") or getattr(service_cls, "process_type", "service")
service_instance = None
try:
# spawn service by type
if process_type == "service":
service_instance = self._spawn_service_process(process_id, name, module, cls, config)
elif process_type == "stream_process":
service_instance = self._spawn_stream_process(process_id, name, module, cls, config)
elif process_type == "agent":
service_instance = self._spawn_agent_process(process_id, name, module, cls, config)
elif process_type == "standalone":
service_instance = self._spawn_standalone_process(process_id, name, module, cls, config)
elif process_type == "immediate":
service_instance = self._spawn_immediate_process(process_id, name, module, cls, config)
elif process_type == "simple":
service_instance = self._spawn_simple_process(process_id, name, module, cls, config)
else:
raise BadRequest("Unknown process type: %s" % process_type)
service_instance._proc_type = process_type
self._register_process(service_instance, name)
service_instance.errcause = "OK"
log.info("AppManager.spawn_process: %s.%s -> pid=%s OK", module, cls, process_id)
if process_type == 'immediate':
log.info('Terminating immediate process: %s', service_instance.id)
self.terminate_process(service_instance.id)
return service_instance.id
except Exception:
errcause = service_instance.errcause if service_instance else "instantiating service"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
raise
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s", gproc)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
svc = self._spawned_proc_to_process.get(gproc, "Unknown")
#
# # make sure svc is in our list
# if not svc in self.procs.values():
# log.warn("svc %s not found in procs list", svc)
# return
self.container.fail_fast("Container process (%s) failed: %s" % (svc, gproc.exception))
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
listen_name = get_safe(config, "process.listen_name") or service_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
# Service RPC endpoint
rsvc1 = ProcessRPCServer(node=self.container.node,
from_name=listen_name,
service=service_instance,
process=service_instance)
# Named local RPC endpoint
rsvc2 = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc1, rsvc2],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(proc, "_spawn_service_process for %s" % ",".join((listen_name, service_instance.id)))
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Directory registration
self.container.directory.register_safe("/Services", listen_name, interface=service_instance.name)
self.container.directory.register_safe("/Services/%s" % listen_name, service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
# Start the service
self._service_start(service_instance)
listen_name = get_safe(config, "process.listen_name") or name
service_instance.stream_subscriber_registrar = StreamSubscriberRegistrar(process=service_instance, node=self.container.node)
sub = service_instance.stream_subscriber_registrar.create_subscriber(exchange_name=listen_name)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc, sub],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(proc, "_spawn_stream_process for %s" % service_instance._proc_name)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
if not isinstance(service_instance, ResourceAgent):
raise ContainerConfigError("Agent process must extend ResourceAgent")
# Set the resource ID if we get it through the config
resource_id = get_safe(service_instance.CFG, "agent.resource_id")
if resource_id:
service_instance.resource_id = resource_id
# Now call the on_init of the agent.
self._service_init(service_instance)
if not service_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._service_start(service_instance)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(proc, "_spawn_agent_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Directory registration
caps = service_instance.get_capabilities()
self.container.directory.register("/Agents", service_instance.id,
**dict(name=service_instance._proc_name,
container=service_instance.container.id,
resource_id=service_instance.resource_id,
agent_id=service_instance.agent_id,
def_id=service_instance.agent_def_id,
capabilities=caps))
if not service_instance.resource_id:
log.warn("Agent process id=%s does not define resource_id!!" % service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(proc, "_spawn_standalone_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
return service_instance
def _create_service_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
service_instance = for_name(module, cls)
if not isinstance(service_instance, BaseService):
raise ContainerConfigError("Instantiated service not a BaseService %r" % service_instance)
# Prepare service instance
service_instance.errcause = ""
service_instance.id = process_id
service_instance.container = self.container
service_instance.CFG = config
service_instance._proc_name = name
# start service dependencies (RPC clients)
self._start_service_dependencies(service_instance)
return service_instance
def _start_service_dependencies(self, service_instance):
service_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s", service_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in service_instance.dependencies:
client = getattr(service_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = service_instance
client.node = self.container.node
# ensure that dep actually exists and is running
if service_instance.name != 'bootstrap' or (service_instance.name == 'bootstrap' and service_instance.CFG.level == dependency):
svc_de = self.container.directory.lookup("/Services/%s" % dependency)
if svc_de is None:
raise ContainerConfigError("Dependency for service %s not running: %s" % (service_instance.name, dependency))
def _service_init(self, service_instance):
# Init process
service_instance.errcause = "initializing service"
service_instance.init()
def _service_start(self, service_instance):
# Start process
# TODO: Check for timeout
service_instance.errcause = "starting service"
service_instance.start()
def _set_publisher_endpoints(self, service_instance, publisher_streams=None):
service_instance.stream_publisher_registrar = StreamPublisherRegistrar(process=service_instance, node=self.container.node)
publisher_streams = publisher_streams or {}
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = service_instance.stream_publisher_registrar.create_publisher(stream_id)
setattr(service_instance, name, pub)
def _register_process(self, service_instance, name):
# Add to local process dict
self.procs_by_name[name] = service_instance
self.procs[service_instance.id] = service_instance
# Add to directory
service_instance.errcause = "registering"
self.container.directory.register_safe("/Containers/%s/Processes" % self.container.id,
service_instance.id, name=name)
self.container.event_pub.publish_event(event_type="ProcessLifecycleEvent",
origin=service_instance.id, origin_type="ContainerProcess",
sub_type="SPAWN",
container_id=self.container.id,
process_type=service_instance._proc_type, process_name=service_instance._proc_name,
state=ProcessStateEnum.SPAWN)
def terminate_process(self, process_id):
service_instance = self.procs.get(process_id, None)
if not service_instance:
raise BadRequest("Cannot terminate. Process id='%s' unknown on container id='%s'" % (
process_id, self.container.id))
service_instance.quit()
# terminate IonProcessThread (may not have one, i.e. simple process)
if service_instance._process:
service_instance._process.notify_stop()
service_instance._process.stop()
del self.procs[process_id]
self.container.directory.unregister_safe("/Containers/%s/Processes" % self.container.id,
service_instance.id)
# Cleanup for specific process types
if service_instance._proc_type == "service":
listen_name = get_safe(service_instance.CFG, "process.listen_name", service_instance.name)
self.container.directory.unregister_safe("/Services/%s" % listen_name, service_instance.id)
remaining_workers = self.container.directory.find_entries("/Services/%s" % listen_name)
if remaining_workers and len(remaining_workers) == 2:
self.container.directory.unregister_safe("/Services", listen_name)
elif service_instance._proc_type == "agent":
self.container.directory.unregister_safe("/Agents", service_instance.id)
self.container.event_pub.publish_event(event_type="ProcessLifecycleEvent",
origin=service_instance.id, origin_type="ContainerProcess",
sub_type="TERMINATE",
container_id=self.container.id,
process_type=service_instance._proc_type, process_name=service_instance._proc_name,
state=ProcessStateEnum.TERMINATE)
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to service_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(heartbeat_secs=CFG.cc.timeout.heartbeat, failure_notify_callback=self._spawned_proc_failed)
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
# Register container as resource object
cc_obj = CapabilityContainer(name=self.container.id, cc_agent=self.container.name)
self.cc_id, _ = self.container.resource_registry.create(cc_obj)
#Create an association to an Org object if not the rot ION org and only if found
if CFG.container.org_name and CFG.container.org_name != CFG.system.root_org:
org,_ = self.container.resource_registry.find_resources(restype=RT.Org,name=CFG.container.org_name, id_only=True )
if org:
self.container.resource_registry.create_association(org[0],PRED.hasResource, self.cc_id) #TODO - replace with proper association
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
from pyon.datastore.couchdb.couchdb_datastore import CouchDB_DataStore
stats1 = CouchDB_DataStore._stats.get_stats()
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
procs_list = sorted(self.procs.values(), key=lambda proc: proc._proc_start_time, reverse=True)
for proc in procs_list:
self.terminate_process(proc.id)
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
if self.procs:
log.warn("ProcManager procs not empty: %s", self.procs)
if self.procs_by_name:
log.warn("ProcManager procs_by_name not empty: %s", self.procs_by_name)
# Remove Resource registration
self.container.resource_registry.delete(self.cc_id, del_associations=True)
# TODO: Check associations to processes
stats2 = CouchDB_DataStore._stats.get_stats()
stats3 = CouchDB_DataStore._stats.diff_stats(stats2, stats1)
log.debug("Datastore stats difference during stop(): %s", stats3)
log.debug("ProcManager stopped, OK.")
def spawn_process(self, name=None, module=None, cls=None, config=None, process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" % process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id, self.proc_id_pool.get_id())
log.debug("ProcManager.spawn_process(name=%s, module.cls=%s.%s, config=%s) as pid=%s", name, module, cls, config, process_id)
process_cfg = CFG.copy()
if config:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
dict_merge(process_cfg, config, inplace=True)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(process_cfg, self.container.spawn_args, inplace=True)
#log.debug("spawn_process() pid=%s process_cfg=%s", process_id, process_cfg)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of: service, stream_process, agent, simple, immediate
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(process_cfg, "process.type") or getattr(service_cls, "process_type", "service")
service_instance = None
try:
# spawn service by type
if process_type == "service":
service_instance = self._spawn_service_process(process_id, name, module, cls, process_cfg)
elif process_type == "stream_process":
service_instance = self._spawn_stream_process(process_id, name, module, cls, process_cfg)
elif process_type == "agent":
service_instance = self._spawn_agent_process(process_id, name, module, cls, process_cfg)
elif process_type == "standalone":
service_instance = self._spawn_standalone_process(process_id, name, module, cls, process_cfg)
elif process_type == "immediate":
service_instance = self._spawn_immediate_process(process_id, name, module, cls, process_cfg)
elif process_type == "simple":
service_instance = self._spawn_simple_process(process_id, name, module, cls, process_cfg)
else:
raise BadRequest("Unknown process type: %s" % process_type)
service_instance._proc_type = process_type
self._register_process(service_instance, name)
service_instance.errcause = "OK"
log.info("ProcManager.spawn_process: %s.%s -> pid=%s OK", module, cls, process_id)
if process_type == 'immediate':
log.info('Terminating immediate process: %s', service_instance.id)
self.terminate_process(service_instance.id)
return service_instance.id
except Exception:
errcause = service_instance.errcause if service_instance else "instantiating service"
log.exception("Error spawning %s %s process (process_id: %s): %s", name, process_type, process_id, errcause)
raise
def list_local_processes(self, process_type=''):
'''
Returns a list of the running ION processes in the container or filtered by the process_type
'''
ret = list()
for p in self.procs.values():
if process_type and p.process_type != process_type:
continue
ret.append(p)
return ret
def list_local_process_names(self, process_type=''):
'''
Returns a list of the running ION processes in the container or filtered by the process_type
'''
ret = list()
for p in self.procs.values():
if process_type and p.process_type != process_type:
continue
ret.append(p.name)
return ret
def is_local_service_process(self, service_name):
local_services = self.list_local_process_names('service')
if service_name in local_services:
return True
return False
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s, %s", gproc, gproc.exception)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
svc = self._spawned_proc_to_process.get(gproc, "Unknown")
#
# # make sure svc is in our list
# if not svc in self.procs.values():
# log.warn("svc %s not found in procs list", svc)
# return
self.container.fail_fast("Container process (%s) failed: %s" % (svc, gproc.exception))
def _cleanup_method(self, queue_name, ep=None):
"""
Common method to be passed to each spawned ION process to clean up their process-queue.
@TODO Leaks implementation detail, should be using XOs
"""
if not ep._chan._queue_auto_delete:
# only need to delete if AMQP didn't handle it for us already!
# @TODO this will not work with XOs (future)
ch = self.container.node.channel(RecvChannel)
ch._recv_name = NameTrio(get_sys_name(), "%s.%s" % (get_sys_name(), queue_name))
ch._destroy_queue()
#TODO - check with Michael if this is acceptable or if there is a better way.
def _is_policy_management_service_available(self):
"""
Method to verify if the Policy Management Service is running in the system.
"""
policy_services, _ = self.container.resource_registry.find_resources(restype=RT.Service,name='policy_management')
if policy_services:
return True
return False
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or service_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
service_instance._proc_listen_name = listen_name
# Service RPC endpoint
rsvc1 = ProcessRPCServer(node=self.container.node,
from_name=listen_name,
service=service_instance,
process=service_instance)
# Named local RPC endpoint
rsvc2 = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc2)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc1, rsvc2],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_service_process for %s" % ",".join((listen_name, service_instance.id)))
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
proc.start_listeners()
# look to load any existing policies for this service
if self._is_policy_management_service_available() and self.container.governance_controller:
self.container.governance_controller.update_service_access_policy(service_instance._proc_listen_name)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or name
service_instance._proc_listen_name = listen_name
service_instance.stream_subscriber_registrar = StreamSubscriberRegistrar(process=service_instance, container=self.container)
sub = service_instance.stream_subscriber_registrar.create_subscriber(exchange_name=listen_name)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc, sub],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_stream_process for %s" % service_instance._proc_name)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
proc.start_listeners()
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
if not isinstance(service_instance, ResourceAgent):
raise ContainerConfigError("Agent process must extend ResourceAgent")
# Set the resource ID if we get it through the config
resource_id = get_safe(service_instance.CFG, "agent.resource_id")
if resource_id:
service_instance.resource_id = resource_id
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_agent_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Now call the on_init of the agent.
self._service_init(service_instance)
if not service_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._service_start(service_instance)
proc.start_listeners()
if service_instance.resource_id:
# look to load any existing policies for this resource
if self._is_policy_management_service_available() and self.container.governance_controller:
self.container.governance_controller.update_resource_access_policy(service_instance.resource_id)
else:
log.warn("Agent process id=%s does not define resource_id!!" % service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(proc, "_spawn_standalone_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
proc.start_listeners()
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
service_instance = self._create_service_instance(process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
return service_instance
def _create_service_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
service_instance = for_name(module, cls)
if not isinstance(service_instance, BaseService):
raise ContainerConfigError("Instantiated service not a BaseService %r" % service_instance)
# Prepare service instance
service_instance.errcause = ""
service_instance.id = process_id
service_instance.container = self.container
service_instance.CFG = config
service_instance._proc_name = name
service_instance._proc_start_time = time.time()
# start service dependencies (RPC clients)
self._start_service_dependencies(service_instance)
return service_instance
def _start_service_dependencies(self, service_instance):
service_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s", service_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in service_instance.dependencies:
client = getattr(service_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = service_instance
client.node = self.container.node
# ensure that dep actually exists and is running
# MM: commented out - during startup (init actually), we don't need to check for service dependencies
# MM: TODO: split on_init from on_start; start consumer in on_start; check for full queues on restart
# if service_instance.name != 'bootstrap' or (service_instance.name == 'bootstrap' and service_instance.CFG.level == dependency):
# svc_de = self.container.resource_registry.find_resources(restype="Service", name=dependency, id_only=True)
# if not svc_de:
# raise ContainerConfigError("Dependency for service %s not running: %s" % (service_instance.name, dependency))
def _service_init(self, service_instance):
# Init process
service_instance.errcause = "initializing service"
service_instance.init()
def _service_start(self, service_instance):
# Start process
# TODO: Check for timeout
service_instance.errcause = "starting service"
service_instance.start()
def _set_publisher_endpoints(self, service_instance, publisher_streams=None):
service_instance.stream_publisher_registrar = StreamPublisherRegistrar(process=service_instance, container=self.container)
publisher_streams = publisher_streams or {}
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = service_instance.stream_publisher_registrar.create_publisher(stream_id)
setattr(service_instance, name, pub)
def _register_process(self, service_instance, name):
"""
Performs all actions related to registering the new process in the system.
Also performs process type specific registration, such as for services and agents
"""
# Add process instance to container's process dict
if name in self.procs_by_name:
log.warn("Process name already registered in container: %s" % name)
self.procs_by_name[name] = service_instance
self.procs[service_instance.id] = service_instance
# Add Process to resource registry
# Note: In general the Process resource should be created by the CEI PD, but not all processes are CEI
# processes. How to deal with this?
service_instance.errcause = "registering"
if service_instance._proc_type != "immediate":
proc_obj = Process(name=service_instance.id, label=name, proctype=service_instance._proc_type)
proc_id, _ = self.container.resource_registry.create(proc_obj)
service_instance._proc_res_id = proc_id
# Associate process with container resource
self.container.resource_registry.create_association(self.cc_id, "hasProcess", proc_id)
else:
service_instance._proc_res_id = None
# Process type specific registration
# TODO: Factor out into type specific handler functions
if service_instance._proc_type == "service":
# Registration of SERVICE process: in resource registry
service_list, _ = self.container.resource_registry.find_resources(restype="Service", name=service_instance.name)
if service_list:
service_instance._proc_svc_id = service_list[0]._id
else:
# We are starting the first process of a service instance
# TODO: This should be created by the HA Service agent in the future
svc_obj = Service(name=service_instance.name, exchange_name=service_instance._proc_listen_name)
service_instance._proc_svc_id, _ = self.container.resource_registry.create(svc_obj)
# Create association to service definition resource
svcdef_list, _ = self.container.resource_registry.find_resources(restype="ServiceDefinition",
name=service_instance.name)
if svcdef_list:
self.container.resource_registry.create_association(service_instance._proc_svc_id,
"hasServiceDefinition", svcdef_list[0]._id)
else:
log.error("Cannot find ServiceDefinition resource for %s", service_instance.name)
self.container.resource_registry.create_association(service_instance._proc_svc_id, "hasProcess", proc_id)
elif service_instance._proc_type == "agent":
# Registration of AGENT process: in Directory
caps = service_instance.get_capabilities()
self.container.directory.register("/Agents", service_instance.id,
**dict(name=service_instance._proc_name,
container=service_instance.container.id,
resource_id=service_instance.resource_id,
agent_id=service_instance.agent_id,
def_id=service_instance.agent_def_id,
capabilities=caps))
# Trigger a real-time event. At this time, everything persistent has to be completed and consistent.
self.container.event_pub.publish_event(event_type="ProcessLifecycleEvent",
origin=service_instance.id,
origin_type="ContainerProcess",
sub_type="SPAWN",
container_id=self.container.id,
process_type=service_instance._proc_type,
process_name=service_instance._proc_name,
state=ProcessStateEnum.SPAWN)
def terminate_process(self, process_id):
"""
Terminates a process and all its resources. Termination is graceful with timeout.
"""
log.debug("terminate_process: %s", process_id)
service_instance = self.procs.get(process_id, None)
if not service_instance:
raise BadRequest("Cannot terminate. Process id='%s' unknown on container id='%s'" % (
process_id, self.container.id))
# Give the process notice to quit doing stuff.
service_instance.quit()
# Terminate IonProcessThread (may not have one, i.e. simple process)
if service_instance._process:
service_instance._process.notify_stop()
service_instance._process.stop()
self._unregister_process(process_id, service_instance)
# Send out real-time notice that process was terminated. At this point, everything persistent
# has to be consistent.
self.container.event_pub.publish_event(event_type="ProcessLifecycleEvent",
origin=service_instance.id, origin_type="ContainerProcess",
sub_type="TERMINATE",
container_id=self.container.id,
process_type=service_instance._proc_type, process_name=service_instance._proc_name,
state=ProcessStateEnum.TERMINATE)
def _unregister_process(self, process_id, service_instance):
# Remove process registration in resource registry
if service_instance._proc_res_id:
self.container.resource_registry.delete(service_instance._proc_res_id, del_associations=True)
# Cleanup for specific process types
if service_instance._proc_type == "service":
# Check if this is the last process for this service and do auto delete service resources here
svcproc_list, _ = self.container.resource_registry.find_objects(service_instance._proc_svc_id,
"hasProcess", "Process", id_only=True)
if not svcproc_list:
self.container.resource_registry.delete(service_instance._proc_svc_id, del_associations=True)
elif service_instance._proc_type == "agent":
self.container.directory.unregister_safe("/Agents", service_instance.id)
# Remove internal registration in container
del self.procs[process_id]
if service_instance._proc_name in self.procs_by_name:
del self.procs_by_name[service_instance._proc_name]
else:
log.warn("Process name %s not in local registry", service_instance.name)
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to service_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(
heartbeat_secs=CFG.cc.timeout.heartbeat,
failure_notify_callback=self._spawned_proc_failed)
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
map(self.terminate_process, self.procs.keys())
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
log.debug("ProcManager stopped, OK.")
def spawn_process(self,
name=None,
module=None,
cls=None,
config=None,
process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" %
process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id,
self.proc_id_pool.get_id())
log.debug(
"ProcManager.spawn_process(name=%s, module.cls=%s.%s) as pid=%s",
name, module, cls, process_id)
if not config:
# Use system CFG. It has the command line args in it
config = DictModifier(CFG)
else:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
config = DictModifier(CFG, config)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(config, self.container.spawn_args, inplace=True)
#log.debug("spawn_process() pid=%s config=%s", process_id, config)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of: service, stream_process, agent, simple, immediate
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(config, "process.type") or getattr(
service_cls, "process_type", "service")
service_instance = None
try:
# spawn service by type
if process_type == "service":
service_instance = self._spawn_service_process(
process_id, name, module, cls, config)
elif process_type == "stream_process":
service_instance = self._spawn_stream_process(
process_id, name, module, cls, config)
elif process_type == "agent":
service_instance = self._spawn_agent_process(
process_id, name, module, cls, config)
elif process_type == "standalone":
service_instance = self._spawn_standalone_process(
process_id, name, module, cls, config)
elif process_type == "immediate":
service_instance = self._spawn_immediate_process(
process_id, name, module, cls, config)
elif process_type == "simple":
service_instance = self._spawn_simple_process(
process_id, name, module, cls, config)
else:
raise BadRequest("Unknown process type: %s" % process_type)
service_instance._proc_type = process_type
self._register_process(service_instance, name)
service_instance.errcause = "OK"
log.info("AppManager.spawn_process: %s.%s -> pid=%s OK", module,
cls, process_id)
if process_type == 'immediate':
log.info('Terminating immediate process: %s',
service_instance.id)
self.terminate_process(service_instance.id)
return service_instance.id
except Exception:
errcause = service_instance.errcause if service_instance else "instantiating service"
log.exception("Error spawning %s %s process (process_id: %s): %s",
name, process_type, process_id, errcause)
raise
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s", gproc)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
svc = self._spawned_proc_to_process.get(gproc, "Unknown")
#
# # make sure svc is in our list
# if not svc in self.procs.values():
# log.warn("svc %s not found in procs list", svc)
# return
self.container.fail_fast("Container process (%s) failed: %s" %
(svc, gproc.exception))
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
listen_name = get_safe(config,
"process.listen_name") or service_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
# Service RPC endpoint
rsvc1 = ProcessRPCServer(node=self.container.node,
from_name=listen_name,
service=service_instance,
process=service_instance)
# Named local RPC endpoint
rsvc2 = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc1, rsvc2],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(
proc, "_spawn_service_process for %s" % ",".join(
(listen_name, service_instance.id)))
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Directory registration
self.container.directory.register_safe("/Services",
listen_name,
interface=service_instance.name)
self.container.directory.register_safe("/Services/%s" % listen_name,
service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
# Start the service
self._service_start(service_instance)
listen_name = get_safe(config, "process.listen_name") or name
service_instance.stream_subscriber_registrar = StreamSubscriberRegistrar(
process=service_instance, node=self.container.node)
sub = service_instance.stream_subscriber_registrar.create_subscriber(
exchange_name=listen_name)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc, sub],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(
proc, "_spawn_stream_process for %s" % service_instance._proc_name)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
if not isinstance(service_instance, ResourceAgent):
raise ContainerConfigError(
"Agent process must extend ResourceAgent")
# Set the resource ID if we get it through the config
resource_id = get_safe(service_instance.CFG, "agent.resource_id")
if resource_id:
service_instance.resource_id = resource_id
# Now call the on_init of the agent.
self._service_init(service_instance)
if not service_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._service_start(service_instance)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(
proc, "_spawn_agent_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Directory registration
caps = service_instance.get_capabilities()
self.container.directory.register(
"/Agents", service_instance.id,
**dict(name=service_instance._proc_name,
container=service_instance.container.id,
resource_id=service_instance.resource_id,
agent_id=service_instance.agent_id,
def_id=service_instance.agent_def_id,
capabilities=caps))
if not service_instance.resource_id:
log.warn("Agent process id=%s does not define resource_id!!" %
service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name)
self.proc_sup.ensure_ready(
proc, "_spawn_standalone_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
return service_instance
def _create_service_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
service_instance = for_name(module, cls)
if not isinstance(service_instance, BaseService):
raise ContainerConfigError(
"Instantiated service not a BaseService %r" % service_instance)
# Prepare service instance
service_instance.errcause = ""
service_instance.id = process_id
service_instance.container = self.container
service_instance.CFG = config
service_instance._proc_name = name
# start service dependencies (RPC clients)
self._start_service_dependencies(service_instance)
return service_instance
def _start_service_dependencies(self, service_instance):
service_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s",
service_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in service_instance.dependencies:
client = getattr(service_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = service_instance
client.node = self.container.node
# ensure that dep actually exists and is running
if service_instance.name != 'bootstrap' or (
service_instance.name == 'bootstrap'
and service_instance.CFG.level == dependency):
svc_de = self.container.directory.lookup("/Services/%s" %
dependency)
if svc_de is None:
raise ContainerConfigError(
"Dependency for service %s not running: %s" %
(service_instance.name, dependency))
def _service_init(self, service_instance):
# Init process
service_instance.errcause = "initializing service"
service_instance.init()
def _service_start(self, service_instance):
# Start process
# TODO: Check for timeout
service_instance.errcause = "starting service"
service_instance.start()
def _set_publisher_endpoints(self,
service_instance,
publisher_streams=None):
service_instance.stream_publisher_registrar = StreamPublisherRegistrar(
process=service_instance, node=self.container.node)
publisher_streams = publisher_streams or {}
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = service_instance.stream_publisher_registrar.create_publisher(
stream_id)
setattr(service_instance, name, pub)
def _register_process(self, service_instance, name):
# Add to local process dict
self.procs_by_name[name] = service_instance
self.procs[service_instance.id] = service_instance
# Add to directory
service_instance.errcause = "registering"
self.container.directory.register_safe("/Containers/%s/Processes" %
self.container.id,
service_instance.id,
name=name)
self.container.event_pub.publish_event(
event_type="ProcessLifecycleEvent",
origin=service_instance.id,
origin_type="ContainerProcess",
sub_type="SPAWN",
container_id=self.container.id,
process_type=service_instance._proc_type,
process_name=service_instance._proc_name,
state=ProcessStateEnum.SPAWN)
def terminate_process(self, process_id):
service_instance = self.procs.get(process_id, None)
if not service_instance:
raise BadRequest(
"Cannot terminate. Process id='%s' unknown on container id='%s'"
% (process_id, self.container.id))
service_instance.quit()
# terminate IonProcessThread (may not have one, i.e. simple process)
if service_instance._process:
service_instance._process.notify_stop()
service_instance._process.stop()
del self.procs[process_id]
self.container.directory.unregister_safe(
"/Containers/%s/Processes" % self.container.id,
service_instance.id)
# Cleanup for specific process types
if service_instance._proc_type == "service":
listen_name = get_safe(service_instance.CFG, "process.listen_name",
service_instance.name)
self.container.directory.unregister_safe(
"/Services/%s" % listen_name, service_instance.id)
remaining_workers = self.container.directory.find_entries(
"/Services/%s" % listen_name)
if remaining_workers and len(remaining_workers) == 2:
self.container.directory.unregister_safe(
"/Services", listen_name)
elif service_instance._proc_type == "agent":
self.container.directory.unregister_safe("/Agents",
service_instance.id)
self.container.event_pub.publish_event(
event_type="ProcessLifecycleEvent",
origin=service_instance.id,
origin_type="ContainerProcess",
sub_type="TERMINATE",
container_id=self.container.id,
process_type=service_instance._proc_type,
process_name=service_instance._proc_name,
state=ProcessStateEnum.TERMINATE)
class ProcManager(object):
def __init__(self, container):
self.container = container
# Define the callables that can be added to Container public API
self.container_api = [self.spawn_process, self.terminate_process]
# Add the public callables to Container
for call in self.container_api:
setattr(self.container, call.__name__, call)
self.proc_id_pool = IDPool()
# Temporary registry of running processes
self.procs_by_name = {}
self.procs = {}
# mapping of greenlets we spawn to service_instances for error handling
self._spawned_proc_to_process = {}
# The pyon worker process supervisor
self.proc_sup = IonProcessThreadManager(
heartbeat_secs=CFG.cc.timeout.heartbeat,
failure_notify_callback=self._spawned_proc_failed)
def start(self):
log.debug("ProcManager starting ...")
self.proc_sup.start()
# Register container as resource object
cc_obj = CapabilityContainer(name=self.container.id,
cc_agent=self.container.name)
self.cc_id, _ = self.container.resource_registry.create(cc_obj)
#Create an association to an Org object if not the rot ION org and only if found
if CFG.container.org_name and CFG.container.org_name != CFG.system.root_org:
org, _ = self.container.resource_registry.find_resources(
restype=RT.Org, name=CFG.container.org_name, id_only=True)
if org:
self.container.resource_registry.create_association(
org[0], PRED.hasResource,
self.cc_id) #TODO - replace with proper association
log.debug("ProcManager started, OK.")
def stop(self):
log.debug("ProcManager stopping ...")
from pyon.datastore.couchdb.couchdb_datastore import CouchDB_DataStore
stats1 = CouchDB_DataStore._stats.get_stats()
# Call quit on procs to give them ability to clean up
# @TODO terminate_process is not gl-safe
# gls = map(lambda k: spawn(self.terminate_process, k), self.procs.keys())
# join(gls)
procs_list = sorted(self.procs.values(),
key=lambda proc: proc._proc_start_time,
reverse=True)
for proc in procs_list:
self.terminate_process(proc.id)
# TODO: Have a choice of shutdown behaviors for waiting on children, timeouts, etc
self.proc_sup.shutdown(CFG.cc.timeout.shutdown)
if self.procs:
log.warn("ProcManager procs not empty: %s", self.procs)
if self.procs_by_name:
log.warn("ProcManager procs_by_name not empty: %s",
self.procs_by_name)
# Remove Resource registration
self.container.resource_registry.delete(self.cc_id,
del_associations=True)
# TODO: Check associations to processes
stats2 = CouchDB_DataStore._stats.get_stats()
stats3 = CouchDB_DataStore._stats.diff_stats(stats2, stats1)
log.debug("Datastore stats difference during stop(): %s", stats3)
log.debug("ProcManager stopped, OK.")
def spawn_process(self,
name=None,
module=None,
cls=None,
config=None,
process_id=None):
"""
Spawn a process within the container. Processes can be of different type.
"""
if process_id and not is_valid_identifier(process_id, ws_sub='_'):
raise BadRequest("Given process_id %s is not a valid identifier" %
process_id)
# Generate a new process id if not provided
# TODO: Ensure it is system-wide unique
process_id = process_id or "%s.%s" % (self.container.id,
self.proc_id_pool.get_id())
log.debug(
"ProcManager.spawn_process(name=%s, module.cls=%s.%s, config=%s) as pid=%s",
name, module, cls, config, process_id)
process_cfg = CFG.copy()
if config:
# Use provided config. Must be dict or DotDict
if not isinstance(config, DotDict):
config = DotDict(config)
dict_merge(process_cfg, config, inplace=True)
if self.container.spawn_args:
# Override config with spawn args
dict_merge(process_cfg,
self.container.spawn_args,
inplace=True)
#log.debug("spawn_process() pid=%s process_cfg=%s", process_id, process_cfg)
# PROCESS TYPE. Determines basic process context (messaging, service interface)
# One of: service, stream_process, agent, simple, immediate
service_cls = named_any("%s.%s" % (module, cls))
process_type = get_safe(process_cfg, "process.type") or getattr(
service_cls, "process_type", "service")
service_instance = None
try:
# spawn service by type
if process_type == "service":
service_instance = self._spawn_service_process(
process_id, name, module, cls, process_cfg)
elif process_type == "stream_process":
service_instance = self._spawn_stream_process(
process_id, name, module, cls, process_cfg)
elif process_type == "agent":
service_instance = self._spawn_agent_process(
process_id, name, module, cls, process_cfg)
elif process_type == "standalone":
service_instance = self._spawn_standalone_process(
process_id, name, module, cls, process_cfg)
elif process_type == "immediate":
service_instance = self._spawn_immediate_process(
process_id, name, module, cls, process_cfg)
elif process_type == "simple":
service_instance = self._spawn_simple_process(
process_id, name, module, cls, process_cfg)
else:
raise BadRequest("Unknown process type: %s" % process_type)
service_instance._proc_type = process_type
self._register_process(service_instance, name)
service_instance.errcause = "OK"
log.info("ProcManager.spawn_process: %s.%s -> pid=%s OK", module,
cls, process_id)
if process_type == 'immediate':
log.info('Terminating immediate process: %s',
service_instance.id)
self.terminate_process(service_instance.id)
return service_instance.id
except Exception:
errcause = service_instance.errcause if service_instance else "instantiating service"
log.exception("Error spawning %s %s process (process_id: %s): %s",
name, process_type, process_id, errcause)
raise
def list_local_processes(self, process_type=''):
'''
Returns a list of the running ION processes in the container or filtered by the process_type
'''
ret = list()
for p in self.procs.values():
if process_type and p.process_type != process_type:
continue
ret.append(p)
return ret
def list_local_process_names(self, process_type=''):
'''
Returns a list of the running ION processes in the container or filtered by the process_type
'''
ret = list()
for p in self.procs.values():
if process_type and p.process_type != process_type:
continue
ret.append(p.name)
return ret
def is_local_service_process(self, service_name):
local_services = self.list_local_process_names('service')
if service_name in local_services:
return True
return False
def _spawned_proc_failed(self, gproc):
log.error("ProcManager._spawned_proc_failed: %s, %s", gproc,
gproc.exception)
# for now - don't worry about the mapping, if we get a failure, just kill the container.
# leave the mapping in place for potential expansion later.
# # look it up in mapping
# if not gproc in self._spawned_proc_to_process:
# log.warn("No record of gproc %s in our map (%s)", gproc, self._spawned_proc_to_process)
# return
#
svc = self._spawned_proc_to_process.get(gproc, "Unknown")
#
# # make sure svc is in our list
# if not svc in self.procs.values():
# log.warn("svc %s not found in procs list", svc)
# return
self.container.fail_fast("Container process (%s) failed: %s" %
(svc, gproc.exception))
def _cleanup_method(self, queue_name, ep=None):
"""
Common method to be passed to each spawned ION process to clean up their process-queue.
@TODO Leaks implementation detail, should be using XOs
"""
if not ep._chan._queue_auto_delete:
# only need to delete if AMQP didn't handle it for us already!
# @TODO this will not work with XOs (future)
ch = self.container.node.channel(RecvChannel)
ch._recv_name = NameTrio(get_sys_name(),
"%s.%s" % (get_sys_name(), queue_name))
ch._destroy_queue()
#TODO - check with Michael if this is acceptable or if there is a better way.
def _is_policy_management_service_available(self):
"""
Method to verify if the Policy Management Service is running in the system.
"""
policy_services, _ = self.container.resource_registry.find_resources(
restype=RT.Service, name='policy_management')
if policy_services:
return True
return False
# -----------------------------------------------------------------
# PROCESS TYPE: service
def _spawn_service_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a service worker.
Attach to service queue with service definition, attach to service pid
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
listen_name = get_safe(config,
"process.listen_name") or service_instance.name
log.debug("Service Process (%s) listen_name: %s", name, listen_name)
service_instance._proc_listen_name = listen_name
# Service RPC endpoint
rsvc1 = ProcessRPCServer(node=self.container.node,
from_name=listen_name,
service=service_instance,
process=service_instance)
# Named local RPC endpoint
rsvc2 = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc2)
# Start an ION process with the right kind of endpoint factory
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc1, rsvc2],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_service_process for %s" % ",".join(
(listen_name, service_instance.id)))
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
proc.start_listeners()
# look to load any existing policies for this service
if self._is_policy_management_service_available(
) and self.container.governance_controller:
self.container.governance_controller.update_service_access_policy(
service_instance._proc_listen_name)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: stream process
def _spawn_stream_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as a data stream process.
Attach to subscription queue with process function.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
listen_name = get_safe(config, "process.listen_name") or name
service_instance._proc_listen_name = listen_name
service_instance.stream_subscriber_registrar = StreamSubscriberRegistrar(
process=service_instance, container=self.container)
sub = service_instance.stream_subscriber_registrar.create_subscriber(
exchange_name=listen_name)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc, sub],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_stream_process for %s" % service_instance._proc_name)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
proc.start_listeners()
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: agent
def _spawn_agent_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as agent process.
Attach to service pid.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
if not isinstance(service_instance, ResourceAgent):
raise ContainerConfigError(
"Agent process must extend ResourceAgent")
# Set the resource ID if we get it through the config
resource_id = get_safe(service_instance.CFG, "agent.resource_id")
if resource_id:
service_instance.resource_id = resource_id
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_agent_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
# Now call the on_init of the agent.
self._service_init(service_instance)
if not service_instance.resource_id:
log.warn("New agent pid=%s has no resource_id set" % process_id)
self._service_start(service_instance)
proc.start_listeners()
if service_instance.resource_id:
# look to load any existing policies for this resource
if self._is_policy_management_service_available(
) and self.container.governance_controller:
self.container.governance_controller.update_resource_access_policy(
service_instance.resource_id)
else:
log.warn("Agent process id=%s does not define resource_id!!" %
service_instance.id)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: standalone
def _spawn_standalone_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as standalone process.
Attach to service pid.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
rsvc = ProcessRPCServer(node=self.container.node,
from_name=service_instance.id,
service=service_instance,
process=service_instance)
# cleanup method to delete process queue (@TODO: leaks a bit here - should use XOs)
cleanup = lambda _: self._cleanup_method(service_instance.id, rsvc)
proc = self.proc_sup.spawn(name=service_instance.id,
service=service_instance,
listeners=[rsvc],
proc_name=service_instance._proc_name,
cleanup_method=cleanup)
self.proc_sup.ensure_ready(
proc, "_spawn_standalone_process for %s" % service_instance.id)
# map gproc to service_instance
self._spawned_proc_to_process[proc.proc] = service_instance
# set service's reference to process
service_instance._process = proc
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
proc.start_listeners()
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: simple
def _spawn_simple_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as simple process.
No attachments.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
# Add publishers if any...
publish_streams = get_safe(config, "process.publish_streams")
self._set_publisher_endpoints(service_instance, publish_streams)
return service_instance
# -----------------------------------------------------------------
# PROCESS TYPE: immediate
def _spawn_immediate_process(self, process_id, name, module, cls, config):
"""
Spawn a process acting as immediate one off process.
No attachments.
"""
service_instance = self._create_service_instance(
process_id, name, module, cls, config)
self._service_init(service_instance)
self._service_start(service_instance)
return service_instance
def _create_service_instance(self, process_id, name, module, cls, config):
"""
Creates an instance of a "service", be it a Service, Agent, Stream, etc.
@rtype BaseService
@return An instance of a "service"
"""
# SERVICE INSTANCE.
service_instance = for_name(module, cls)
if not isinstance(service_instance, BaseService):
raise ContainerConfigError(
"Instantiated service not a BaseService %r" % service_instance)
# Prepare service instance
service_instance.errcause = ""
service_instance.id = process_id
service_instance.container = self.container
service_instance.CFG = config
service_instance._proc_name = name
service_instance._proc_start_time = time.time()
# start service dependencies (RPC clients)
self._start_service_dependencies(service_instance)
return service_instance
def _start_service_dependencies(self, service_instance):
service_instance.errcause = "setting service dependencies"
log.debug("spawn_process dependencies: %s",
service_instance.dependencies)
# TODO: Service dependency != process dependency
for dependency in service_instance.dependencies:
client = getattr(service_instance.clients, dependency)
assert client, "Client for dependency not found: %s" % dependency
# @TODO: should be in a start_client in RPCClient chain
client.process = service_instance
client.node = self.container.node
# ensure that dep actually exists and is running
# MM: commented out - during startup (init actually), we don't need to check for service dependencies
# MM: TODO: split on_init from on_start; start consumer in on_start; check for full queues on restart
# if service_instance.name != 'bootstrap' or (service_instance.name == 'bootstrap' and service_instance.CFG.level == dependency):
# svc_de = self.container.resource_registry.find_resources(restype="Service", name=dependency, id_only=True)
# if not svc_de:
# raise ContainerConfigError("Dependency for service %s not running: %s" % (service_instance.name, dependency))
def _service_init(self, service_instance):
# Init process
service_instance.errcause = "initializing service"
service_instance.init()
def _service_start(self, service_instance):
# Start process
# TODO: Check for timeout
service_instance.errcause = "starting service"
service_instance.start()
def _set_publisher_endpoints(self,
service_instance,
publisher_streams=None):
service_instance.stream_publisher_registrar = StreamPublisherRegistrar(
process=service_instance, container=self.container)
publisher_streams = publisher_streams or {}
for name, stream_id in publisher_streams.iteritems():
# problem is here
pub = service_instance.stream_publisher_registrar.create_publisher(
stream_id)
setattr(service_instance, name, pub)
def _register_process(self, service_instance, name):
"""
Performs all actions related to registering the new process in the system.
Also performs process type specific registration, such as for services and agents
"""
# Add process instance to container's process dict
if name in self.procs_by_name:
log.warn("Process name already registered in container: %s" % name)
self.procs_by_name[name] = service_instance
self.procs[service_instance.id] = service_instance
# Add Process to resource registry
# Note: In general the Process resource should be created by the CEI PD, but not all processes are CEI
# processes. How to deal with this?
service_instance.errcause = "registering"
if service_instance._proc_type != "immediate":
proc_obj = Process(name=service_instance.id,
label=name,
proctype=service_instance._proc_type)
proc_id, _ = self.container.resource_registry.create(proc_obj)
service_instance._proc_res_id = proc_id
# Associate process with container resource
self.container.resource_registry.create_association(
self.cc_id, "hasProcess", proc_id)
else:
service_instance._proc_res_id = None
# Process type specific registration
# TODO: Factor out into type specific handler functions
if service_instance._proc_type == "service":
# Registration of SERVICE process: in resource registry
service_list, _ = self.container.resource_registry.find_resources(
restype="Service", name=service_instance.name)
if service_list:
service_instance._proc_svc_id = service_list[0]._id
else:
# We are starting the first process of a service instance
# TODO: This should be created by the HA Service agent in the future
svc_obj = Service(
name=service_instance.name,
exchange_name=service_instance._proc_listen_name)
service_instance._proc_svc_id, _ = self.container.resource_registry.create(
svc_obj)
# Create association to service definition resource
svcdef_list, _ = self.container.resource_registry.find_resources(
restype="ServiceDefinition", name=service_instance.name)
if svcdef_list:
self.container.resource_registry.create_association(
service_instance._proc_svc_id, "hasServiceDefinition",
svcdef_list[0]._id)
else:
log.error("Cannot find ServiceDefinition resource for %s",
service_instance.name)
self.container.resource_registry.create_association(
service_instance._proc_svc_id, "hasProcess", proc_id)
elif service_instance._proc_type == "agent":
# Registration of AGENT process: in Directory
caps = service_instance.get_capabilities()
self.container.directory.register(
"/Agents", service_instance.id,
**dict(name=service_instance._proc_name,
container=service_instance.container.id,
resource_id=service_instance.resource_id,
agent_id=service_instance.agent_id,
def_id=service_instance.agent_def_id,
capabilities=caps))
# Trigger a real-time event. At this time, everything persistent has to be completed and consistent.
self.container.event_pub.publish_event(
event_type="ProcessLifecycleEvent",
origin=service_instance.id,
origin_type="ContainerProcess",
sub_type="SPAWN",
container_id=self.container.id,
process_type=service_instance._proc_type,
process_name=service_instance._proc_name,
state=ProcessStateEnum.SPAWN)
def terminate_process(self, process_id):
"""
Terminates a process and all its resources. Termination is graceful with timeout.
"""
log.debug("terminate_process: %s", process_id)
service_instance = self.procs.get(process_id, None)
if not service_instance:
raise BadRequest(
"Cannot terminate. Process id='%s' unknown on container id='%s'"
% (process_id, self.container.id))
# Give the process notice to quit doing stuff.
service_instance.quit()
# Terminate IonProcessThread (may not have one, i.e. simple process)
if service_instance._process:
service_instance._process.notify_stop()
service_instance._process.stop()
self._unregister_process(process_id, service_instance)
# Send out real-time notice that process was terminated. At this point, everything persistent
# has to be consistent.
self.container.event_pub.publish_event(
event_type="ProcessLifecycleEvent",
origin=service_instance.id,
origin_type="ContainerProcess",
sub_type="TERMINATE",
container_id=self.container.id,
process_type=service_instance._proc_type,
process_name=service_instance._proc_name,
state=ProcessStateEnum.TERMINATE)
def _unregister_process(self, process_id, service_instance):
# Remove process registration in resource registry
if service_instance._proc_res_id:
self.container.resource_registry.delete(
service_instance._proc_res_id, del_associations=True)
# Cleanup for specific process types
if service_instance._proc_type == "service":
# Check if this is the last process for this service and do auto delete service resources here
svcproc_list, _ = self.container.resource_registry.find_objects(
service_instance._proc_svc_id,
"hasProcess",
"Process",
id_only=True)
if not svcproc_list:
self.container.resource_registry.delete(
service_instance._proc_svc_id, del_associations=True)
elif service_instance._proc_type == "agent":
self.container.directory.unregister_safe("/Agents",
service_instance.id)
# Remove internal registration in container
del self.procs[process_id]
if service_instance._proc_name in self.procs_by_name:
del self.procs_by_name[service_instance._proc_name]
else:
log.warn("Process name %s not in local registry",
service_instance.name)