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()
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()
