def kasaya_connection_broken(self, addr):
"""
Should be called when connection with kasaya is broken.
"""
LOG.debug("Connection closed with %s", addr)
if self.status < 3: # is worker is already stopping?
self.status = 1 #set status as 1 - waiting for start
def worker_start_remote(self, worker_id, host_id, address, service):
"""
Remote worker started
"""
self.DB.worker_register(host_id, worker_id, service, address)
LOG.info("Remote worker [%s] started, address [%s] [id:%s]" %
(service, address, worker_id))
def __load_config(self):
"""
This function is used only if servicename is not given, and
daemon is not started by kasaya daemon.
"""
from kasaya.conf import load_worker_settings, set_value
try:
config = load_worker_settings("service.conf")
except IOError:
import sys
LOG.critical(
"File 'service.conf' not found, unable to start service.")
sys.exit(1)
# system settings overwriting
for k, v in config['config'].items():
set_value(k, v)
# worker environment
for k, v in config['env'].items():
os.environ[k.upper()] = v
# service name
svcc = config['service']
svname = svcc['name']
LOG.info("Service config loaded. Service name: %s" % svname)
# set flag to load tasks automatically
self.__auto_load_tasks_module = svcc['module']
return svname
def hearbeat_loop(self):
"""
Periodically check all locally registered workers ping time. Unregister dead workers
"""
maxpinglife = timedelta(seconds=settings.HEARTBEAT_TIMEOUT +
settings.WORKER_HEARTBEAT)
unreglist = []
while True:
now = datetime.now()
for ID, nfo in self.__pingdb.iteritems():
# find outdated timeouts
to = nfo['t'] + maxpinglife
if to < now:
LOG.warning(
"Worker [%s] with id [%s] died. Unregistering." %
(nfo['s'], ID))
unreglist.append(ID)
# unregister all dead workers
while len(unreglist) > 0:
ID = unreglist.pop()
self.worker_stop(ID)
gevent.sleep(settings.WORKER_HEARTBEAT)
def handle_request(self, message):
"""
All control requests are handled here.
message - message body
islocal - if true then request is from localhost
"""
method = message['method'] #".".join(message['method'])
LOG.debug("Management call [%s]" % method)
#LOG.debug(repr(message))
try:
func = self.__ctltasks[method] # get handler for method
except KeyError:
raise exceptions.MethodNotFound("Control method %s not exists" %
method)
# fill missing parameters
if 'args' not in message:
message['args'] = []
if 'kwargs' not in message:
message['kwargs'] = {}
try:
# call internal function
result = func(*message['args'], **message['kwargs'])
except RedirectRequiredToIP as e:
# redirect to IP
addr = self.ip_to_zmq_addr(e.remote_ip)
return self.redirect(addr, message)
except RedirectRequiredToAddr as e:
# redirect to address
return self.redirect(e.remote_addr, message)
return result
def run_task(self, funcname, args, kwargs):
# find task in worker db
try:
task = worker_methods_db[funcname]
except KeyError:
self._tasks_nonex += 1
LOG.info("Unknown worker task called [%s]" % funcname)
return exception_serialize_internal('Method %s not found' %
funcname)
# try to run function and catch exceptions
try:
LOG.debug("task %s, args %s, kwargs %s" %
(funcname, repr(args), repr(kwargs)))
func = task['func']
tout = task['timeout']
if tout is None:
# call task without timeout
result = func(*args, **kwargs)
else:
# call task with timeout
with gevent.Timeout(tout, TaskTimeout):
result = func(*args, **kwargs)
self._tasks_succes += 1
task['res_succ'] += 1
return {'message': messages.RESULT, 'result': result}
except TaskTimeout as e:
# timeout exceeded
self._tasks_error += 1
task['res_tout'] += 1
err = exception_serialize(e, internal=False)
LOG.info("Task [%s] timeout (after %i s)." % (funcname, tout))
return err
except Exception as e:
# exception occured
self._tasks_error += 1
task['res_err'] += 1
err = exception_serialize(e, internal=False)
LOG.info("Task [%s] exception [%s]. Message: %s" %
(funcname, err['name'], err['description']))
LOG.debug(err['traceback'])
return err
finally:
# close django connection
# if worker is using Django ORM we must close database connection manually,
# or each task will leave one unclosed connection. This is done automatically.
if task['close_djconn']:
try:
_close_dj_connection()
except Exception as e:
if e.__class__.__name__ == "ImproperlyConfigured":
# django connection is not required or diango orm is not used at all,
# because of that we replace _close_dj_connection function by empty lambda
global _close_dj_connection
_close_dj_connection = lambda: None
def on_remote_kasayad_start(self, host_id, addr):
"""
Remote kasaya host started
"""
# register self in database
self.DB.host_register(host_id, addr)
LOG.info("Remote kasaya daemon started, address: %s [id:%s]" %
(addr, host_id))
def local_services():
"""
Return list of local services
"""
#cnfame = os.path.join( settings['LOCAL_WORKERS_DIR'], SERVICE_GLOBAL_CONFIG_NAME )
#if os.path.exists(cnfame):
# config = KasayaConfigParser(cnfame)
#else:
# config = None
result = {}
# # internal services
# if settings.USE_ASYNC_SERVICE:
# s = Service("asyncd", config)
# result[s.name] = s
#
# if settings.USE_TRANSACTION_SERVICE:
# s = Service("transactiond", config)
# result[s.name] = s
#
# if settings.USE_AUTH_SERVICE:
# s = Service("authd", config)
# result[s.name] = s
#
# if settings.USE_LOG_SERVICE:
# s = Service("logd", config)
# result[s.name] = s
# user services
dname = os.path.abspath(settings.LOCAL_WORKERS_DIR)
if not os.path.exists(dname):
return result
for sdir in os.listdir(dname):
# service config
fp = os.path.join(dname, sdir)
cnf = os.path.join(fp, SERVICE_CONFIG_NAME)
if not os.path.exists(cnf):
continue
# directory contains service
try:
s = Service(fp)
except UnknownServiceMode as e:
LOG.error(
"Service [%s] requires mode [%s] which is unimplemented. Ignoring."
% (e.service, e.mode))
continue
if s.name in result:
LOG.error("Found more than one service with name [%s]. Ignoring." %
s.name)
continue
result[s.name] = s
return result
def worker_start_local(self, worker_id, address, service, pid):
"""
Local worker started
"""
self.DB.worker_register(self.DAEMON.ID, worker_id, service, address,
pid, False)
LOG.info("Local worker [%s] started, address [%s] [id:%s]" %
(service, address, worker_id))
# emit signal
emit("worker-local-wait", worker_id)
def close(self):
"""
Notifies network about shutting down, closes database
and all used sockets.
"""
LOG.info("Stopping local kasaya daemon")
self.on_local_kasayad_stop(self.ID, local=True)
self.WORKER.close()
self.DB.close()
self.BC.close()
def stop(self):
self.__hbloop = False
self.status = 3
LOG.debug("Sending stop notification. Address [%s]" %
self.loop.address)
self.SYNC.notify_worker_stop()
self.loop.stop()
# killing greenlets
for g in self.__greens:
g.kill(block=True)
LOG.debug("Worker [%s] stopped" % self.servicename)
def CTL_start(self):
"""
Set status of worker as running. This allow to process tasks
"""
if self.status == 1:
self.status = 2
LOG.info("Received status: running.")
# call tasks after worker started listening
g = gevent.Greenlet(self._worker_listening)
g.start()
return True
return False
def register_raw_task(self, message_type, raw_responce, func):
"""
Raw task is used internally to enhance kasaya protocol
by handling special types of messages. It's used internally
by kasaya own daemons
"""
self._raw_tasks[message_type] = {
'func': func,
'raw_resp': raw_responce
}
LOG.debug("Registered raw task handler %s -> %s" %
(message_type, func.__name__))
def __init__(self):
super(KasayaDaemon, self).__init__(is_host=True)
# event handlers
add_event_handler("host-join", self.on_remote_kasayad_start)
add_event_handler("host-leave", self.on_remote_kasayad_stop)
self.hostname = system.get_hostname()
LOG.info("Starting local kasaya daemon with ID: [%s]" % self.ID)
self.DB = NetworkStateDB() # database
self.BC = UDPBroadcast(self.ID) # broadcaster
self.SYNC = Synchronizer(self.DB, self.ID) # synchronisation
self.WORKER = SyncWorker(server=self, database=self.DB)
self.BC.set_own_ip(self.WORKER.own_ip)
def notify_kasayad_refresh(self, ID, services=None, local=False):
"""
Received information on host changes
"""
if services is not None:
slst = ", ".join(services)
if local:
# local changes require broadcast new service status
self.BC.send_host_refresh(self.ID, services=services)
LOG.info("Local service list changed [%s]" % slst)
else:
# remote host services requires daabase update
# local updates are entered to database
# before notify_kasayad_refresh is called
self.DB.service_update_list(self.ID, services)
LOG.info("Remote host service list changed [%s]" % slst)
def run(self):
if not self.__skip_loading_modules:
self.__load_modules()
self.status = 1
LOG.debug("Service [%s] starting." % self.servicename)
# before run...
self._worker_just_started()
self.__greens = []
self.__greens.append(gevent.spawn(self.loop.loop))
self.__greens.append(gevent.spawn(self.heartbeat_loop))
try:
gevent.joinall(self.__greens)
finally:
self.stop()
self.close()
# just finished working
self._worker_just_stopped()
def worker_prepare(self, worker_id):
"""
After start, worker is in offline state.
It need to be configured and after then it can be activated to be online.
This function make all required things and when worker is online it broadcast new worker in network.
"""
wrknfo = self.DB.worker_get(worker_id)
# all configuration of worker should be there
pass
# send information to worker to start processing tasks
msg = {'message': messages.CTL_CALL, 'method': 'start'}
res = send_and_receive_response(wrknfo['addr'], msg)
LOG.debug("Local worker [%s] on [%s] is now online" %
(wrknfo['service'], wrknfo['addr']))
# broadcast new worker state
self.DB.worker_set_state(worker_id, True)
def notify_kasayad_start(self, ID, hostname, ip, services, local=False):
"""
Send information about startup of host to all other hosts in network.
"""
isnew = self.DB.host_register(ID, hostname, ip, services)
if local:
# it is ourself starting, send broadcast to other kasaya daemons
self.BC.send_host_start(ID, hostname, ip, services)
if isnew:
# new kasayad
# send request to local workers to send immadiately ping broadcast
# to inform new kasaya daemon about self
#self.WORKER.request_workers_broadcast()
# it's remote host starting, information is from broadcast
LOG.info(
"Remote kasaya daemon [%s] started, address [%s], ID [%s]" %
(hostname, ip, ID))
# if registered new kasayad AND it's not local host, then
# it must be new host in network, which don't know other hosts.
# We send again registering information about self syncd instance.
gevent.sleep(0.5)
self.notify_kasayad_self_start()
def register_task(self, name, func, timeout, anonymous, permissions,
close_dj_conn):
# task name
if name is None:
name = func.__name__
if name in self.db:
if func == self.db[name]['func']:
return
c = "Task %s is already registered" % name
LOG.critical(c)
raise Exception(c)
# timeout
if not timeout is None:
if type(timeout) != int:
raise Exception("Timeout must be integer value")
if timeout < 0:
raise Exception("Timeout cannot be negative value")
# extra params for task
doc = func.__doc__
if not doc is None:
doc = doc.strip()
taskdata = {
'func': func,
'doc': doc, # docstring
'timeout': timeout, # timeout in seconds
'anon': anonymous, # can task be executed without authorisation
'perms': permissions, # permissions required to call task
'close_djconn': close_dj_conn, # close django connection on exit
'res_succ': 0, # successful calls
'res_err': 0, # error finishing calls
'res_tout': 0, # timed out calls
}
self.db[name] = taskdata
LOG.debug("Registered task %s" % name)
def __init__(self, silentinit=False):
# binary header
import struct
#
# header format
# ! big-endian
# 6s - 6 characters of header prefix
# h - protocol version (=1)
# L - unsigned long - data size
# 16s - 16 bytes of initial vector (used for encryption)
# ? - boolean - compression flag
# H - unsigned short - how many bytes trim from data
# ? - boolean - response required
#
self.header = struct.Struct(b"!6s h L 16s ? H ?")
self._version = 1
# encrypted or not...
if settings.ENCRYPTION:
# encrypter, decrypter
from kasaya.core.protocol.encryption import encrypt, decrypt
self.encrypt = encrypt
self.decrypt = decrypt
self.serialize = self._encrypted_serialize
self.deserialize = self._encrypted_deserialize
self._passwd = _load_passwd()
else:
self.serialize = self._plain_serialize
self.deserialize = self._plain_deserialize
# servicebus name
import sys
py3 = sys.version_info >= (3, 0)
if py3:
busname = bytes(settings.SERVICE_BUS_NAME, "ascii")
busname += b" " * (6 - len(busname))
else:
busname = str(settings.SERVICE_BUS_NAME)
busname += b" " * (6 - len(busname))
self._busname = busname
# transport protocol
if settings.TRANSPORT_PROTOCOL == "pickle":
from kasaya.core.protocol.transport.tr_pickle import bin_2_data, data_2_bin
elif settings.TRANSPORT_PROTOCOL == "bson":
if py3:
# python 3 bson
from kasaya.core.protocol.transport.tr_bson3 import bin_2_data, data_2_bin
else:
# python 2 bson
from kasaya.core.protocol.transport.tr_bson2 import bin_2_data, data_2_bin
elif settings.TRANSPORT_PROTOCOL == "msgpack":
from kasaya.core.protocol.transport.tr_msgpack import bin_2_data, data_2_bin
else:
raise Exception("Unsupported transport protocol %s" %
settings.TRANSPORT_PROTOCOL)
self.bin_2_data = bin_2_data
self.data_2_bin = data_2_bin
if silentinit:
return
LOG.debug(
"Service bus is configured to use %s as transport protocol." %
settings.TRANSPORT_PROTOCOL)
set_value(k, v)
# setup logging
set_value("LOG_TO_FILE", "1")
set_value("LOGGER_NAME", servicename)
set_value(
"LOG_FILE_NAME",
os.environ.get('SV_LOG_FILE', "/tmp/service_%s.log" % servicename))
from kasaya.core.lib.logger import stdLogOut
from kasaya.core.lib import LOG
# redirect stdout and stderr to log
sys.stdout = stdLogOut(LOG, "DEBUG")
sys.stderr = stdLogOut(LOG, "ERROR")
LOG.stetupLogger()
if kasayad_mode:
# starting kasaya daemon
from kasaya.workers.kasayad import KasayaDaemon
daemon = KasayaDaemon()
daemon.run()
else:
# starting regular worker
from kasaya import WorkerDaemon
cwd = os.getcwd()
if not cwd in sys.path:
sys.path.append(cwd)
__import__(module)
worker = WorkerDaemon(servicename, False)
worker.run()
def connection_handler(self, SOCK, address):
ssid = None
while True:
try:
msgdata, resreq = _receive_and_deserialize(
SOCK, self.serializer)
except (NoData, ConnectionClosed):
return
try:
msg = msgdata['message']
except KeyError:
if resreq:
self._send_noop(SOCK)
LOG.debug("Decoded message is incomplete. Message dump: %s" %
repr(msgdata))
continue
# message SET_SESSION_ID is special message
# it never return reply and is not propagated to handlers
if msg == messages.SET_SESSION_ID:
try:
ssid = msgdata['id']
#print("conn session id" , address, ssid)
except KeyError:
pass
if resreq:
self._send_noop(SOCK)
continue
# find message handler
try:
handler, rawmsg = self._msgdb[msg]
except KeyError:
# unknown messages are ignored
if resreq:
self._send_noop(SOCK)
LOG.warning("Unknown message received [%s]" % msg)
LOG.debug("Message body dump:\n%s" % repr(msgdata))
continue
# run handler
try:
result = handler(msgdata)
except Exception as e:
result = exception_serialize(e, False)
LOG.info(
"Exception [%s] when processing message [%s]. Message: %s."
% (result['name'], msg, result['description']))
#LOG.debug("Message dump: %s" % repr(msgdata) )
#LOG.debug(result['traceback'])
if not resreq:
# if response is not required, then don't send exceptions
continue
_serialize_and_send(
SOCK,
self.serializer,
exception_serialize(e, False),
resreq=False, # response never require another response
)
continue
# response is not expected, throw result and back to loop
if not resreq:
continue
try:
# send result
if rawmsg:
_serialize_and_send(
SOCK,
self.serializer,
result,
resreq=False,
)
else:
_serialize_and_send(SOCK,
self.serializer, {
"message": messages.RESULT,
"result": result,
},
resreq=False)
except ConnectionClosed:
return
def worker_stop_local(self, worker_id):
"""
Local worker stopped
"""
self.DB.worker_unregister(ID=worker_id)
LOG.info("Local worker stopped [id:%s]" % worker_id)
def kasaya_connection_started(self, addr):
"""
This will be called when connection with kasaya is started
"""
LOG.debug("Connected to %s", addr)
self.SYNC.notify_worker_live(self.status)
def worker_stop_remote(self, worker_id):
"""
Remote worker stopped
"""
self.DB.worker_unregister(ID=worker_id)
LOG.info("Remote worker stopped [id:%s]" % worker_id)
def __init__(self,
servicename=None,
load_config=True,
skip_loading_modules=False):
super(WorkerDaemon, self).__init__()
# config loader
if servicename is None:
load_config = True
if load_config:
LOG.info("Loading service.conf")
if servicename is None:
servicename = self.__load_config()
self.servicename = servicename
self.__skip_loading_modules = skip_loading_modules
# worker status
# 0 - initialized
# 1 - starting or waiting for reconnect to kasaya
# 2 - working
# 3 - stopping
# 4 - dead
self.status = 0
LOG.info("Starting worker daemon, service [%s], ID: [%s]" %
(self.servicename, self.ID))
adr = "tcp://%s:%i" % (settings.BIND_WORKER_TO,
settings.WORKER_MIN_PORT)
self.loop = MessageLoop(adr, settings.WORKER_MAX_PORT)
add_event_handler("sender-conn-closed", self.kasaya_connection_broken)
add_event_handler("sender-conn-started",
self.kasaya_connection_started)
self.SYNC = KasayaLocalClient(autoreconnect=True, sessionid=self.ID)
self.SYNC.setup(servicename, self.loop.address, self.ID, os.getpid())
LOG.debug("Binded to socket [%s]" %
(",".join(self.loop.binded_ip_list())))
# registering handlers
self.loop.register_message(messages.SYNC_CALL,
self.handle_sync_call,
raw_msg_response=True)
self.loop.register_message(messages.CTL_CALL,
self.handle_control_request)
# heartbeat
self.__hbloop = True
#exposing methods
self.exposed_methods = []
# control tasks
self.ctl = ControlTasks()
self.ctl.register_task("stop", self.CTL_stop)
self.ctl.register_task("start", self.CTL_start)
self.ctl.register_task("stats", self.CTL_stats)
self.ctl.register_task("tasks", self.CTL_methods)
# stats
#self._sb_errors = 0 # internal service bus errors
self._tasks_succes = 0 # succesfully processed tasks
self._tasks_error = 0 # task which triggered exceptions
self._tasks_nonex = 0 # non existing tasks called
self._tasks_control = 0 # control tasks received
self._start_time = datetime.datetime.now() # time of worker start
def loop(self):
while self.is_running:
# receive data
msgdata, addr = self.SOCK.recvfrom(4096)
# skip own broadcast messages
if addr[0] == self.own_ip:
continue
# deserialize
try:
msgdata, repreq = self.serializer.deserialize(msgdata)
except NotOurMessage:
continue
except Exception:
LOG.warning("Message from broadcast deserialisation error")
LOG.debug(
"Broken message body dump in hex (only first 1024 bytes):\n%s"
% msgdata[:1024].encode("hex"))
continue
# own broadcast from another interface
try:
if msgdata['__sid__'] == self.ID:
continue
except KeyError:
continue
# message type
try:
msg = msgdata['message']
except KeyError:
LOG.debug("Decoded message is incomplete. Message dump: %s" %
repr(msgdata))
continue
# find handler
try:
handler = self._msgdb[msg]
except KeyError:
# unknown messages are ignored silently
LOG.warning("Unknown message received [%s]" % msg)
LOG.debug("Message body dump:\n%s" % repr(msgdata))
continue
# run handler
try:
handler(msgdata)
except Exception as e:
# log exception details
excname = e.__class__.__name__
# traceback
tback = traceback.format_exc()
try:
tback = unicode(tback, "utf-8")
except:
tback = repr(tback)
# error message
errmsg = e.message
try:
errmsg = unicode(errmsg, "utf-8")
except:
errmsg = repr(errmsg)
# log & clean
LOG.error(
"Exception [%s] when processing message [%s]. Message: %s."
% (excname, msg, errmsg))
LOG.debug("Message dump: %s" % repr(msgdata))
LOG.debug(tback)
del excname, tback, errmsg
def on_remote_kasayad_stop(self, host_id):
"""
received information about kasaya host leaving network
"""
self.DB.host_unregister(self.ID)
LOG.info("Remote kasaya daemon stopped, [id:%s]" % host_id)
