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from supervisor.states import getProcessStateDescription from supervisor.compat import as_string callbacks = [] def subscribe(type, callback): callbacks.append((type, callback)) def unsubscribe(type, callback): callbacks.remove((type, callback)) def notify(event): for type, callback in callbacks: if isinstance(event, type): callback(event) def clear(): callbacks[:] = [] class Event: """ Abstract event type """ pass class ProcessLogEvent(Event): """ Abstract """ channel = None def __init__(self, process, pid, data): self.process = process self.pid = pid self.data = data def payload(self): groupname = '' if self.process.group is not None: groupname = self.process.group.config.name try: data = as_string(self.data) except UnicodeDecodeError: data = 'Undecodable: %r' % self.data # On Python 2, stuff needs to be in Unicode before invoking the # % operator, otherwise implicit encodings to ASCII can cause # failures fmt = as_string('processname:%s groupname:%s pid:%s channel:%s\n%s') result = fmt % (as_string(self.process.config.name), as_string(groupname), self.pid, as_string(self.channel), data) return result class ProcessLogStdoutEvent(ProcessLogEvent): channel = 'stdout' class ProcessLogStderrEvent(ProcessLogEvent): channel = 'stderr' class ProcessCommunicationEvent(Event): """ Abstract """ # event mode tokens BEGIN_TOKEN = b'<!--XSUPERVISOR:BEGIN-->' END_TOKEN = b'<!--XSUPERVISOR:END-->' def __init__(self, process, pid, data): self.process = process self.pid = pid self.data = data def payload(self): groupname = '' if self.process.group is not None: groupname = self.process.group.config.name try: data = as_string(self.data) except UnicodeDecodeError: data = 'Undecodable: %r' % self.data return 'processname:%s groupname:%s pid:%s\n%s' % ( self.process.config.name, groupname, self.pid, data) class ProcessCommunicationStdoutEvent(ProcessCommunicationEvent): channel = 'stdout' class ProcessCommunicationStderrEvent(ProcessCommunicationEvent): channel = 'stderr' class RemoteCommunicationEvent(Event): def __init__(self, type, data): self.type = type self.data = data def payload(self): return 'type:%s\n%s' % (self.type, self.data) class SupervisorStateChangeEvent(Event): """ Abstract class """ def payload(self): return '' class SupervisorRunningEvent(SupervisorStateChangeEvent): pass class SupervisorStoppingEvent(SupervisorStateChangeEvent): pass class EventRejectedEvent: # purposely does not subclass Event def __init__(self, process, event): self.process = process self.event = event class ProcessStateEvent(Event): """ Abstract class, never raised directly """ frm = None to = None def __init__(self, process, from_state, expected=True): self.process = process self.from_state = from_state self.expected = expected # we eagerly render these so if the process pid, etc changes beneath # us, we stash the values at the time the event was sent self.extra_values = self.get_extra_values() def payload(self): groupname = '' if self.process.group is not None: groupname = self.process.group.config.name L = [('processname', self.process.config.name), ('groupname', groupname), ('from_state', getProcessStateDescription(self.from_state))] L.extend(self.extra_values) s = ' '.join( [ '%s:%s' % (name, val) for (name, val) in L ] ) return s def get_extra_values(self): return [] class ProcessStateFatalEvent(ProcessStateEvent): pass class ProcessStateUnknownEvent(ProcessStateEvent): pass class ProcessStateStartingOrBackoffEvent(ProcessStateEvent): def get_extra_values(self): return [('tries', int(self.process.backoff))] class ProcessStateBackoffEvent(ProcessStateStartingOrBackoffEvent): pass class ProcessStateStartingEvent(ProcessStateStartingOrBackoffEvent): pass class ProcessStateExitedEvent(ProcessStateEvent): def get_extra_values(self): return [('expected', int(self.expected)), ('pid', self.process.pid)] class ProcessStateRunningEvent(ProcessStateEvent): def get_extra_values(self): return [('pid', self.process.pid)] class ProcessStateStoppingEvent(ProcessStateEvent): def get_extra_values(self): return [('pid', self.process.pid)] class ProcessStateStoppedEvent(ProcessStateEvent): def get_extra_values(self): return [('pid', self.process.pid)] class ProcessGroupEvent(Event): def __init__(self, group): self.group = group def payload(self): return 'groupname:%s\n' % self.group class ProcessGroupAddedEvent(ProcessGroupEvent): pass class ProcessGroupRemovedEvent(ProcessGroupEvent): pass class TickEvent(Event): """ Abstract """ def __init__(self, when, supervisord): self.when = when self.supervisord = supervisord def payload(self): return 'when:%s' % self.when class Tick5Event(TickEvent): period = 5 class Tick60Event(TickEvent): period = 60 class Tick3600Event(TickEvent): period = 3600 TICK_EVENTS = [ Tick5Event, Tick60Event, Tick3600Event ] # imported elsewhere class EventTypes: EVENT = Event # abstract PROCESS_STATE = ProcessStateEvent # abstract PROCESS_STATE_STOPPED = ProcessStateStoppedEvent PROCESS_STATE_EXITED = ProcessStateExitedEvent PROCESS_STATE_STARTING = ProcessStateStartingEvent PROCESS_STATE_STOPPING = ProcessStateStoppingEvent PROCESS_STATE_BACKOFF = ProcessStateBackoffEvent PROCESS_STATE_FATAL = ProcessStateFatalEvent PROCESS_STATE_RUNNING = ProcessStateRunningEvent PROCESS_STATE_UNKNOWN = ProcessStateUnknownEvent PROCESS_COMMUNICATION = ProcessCommunicationEvent # abstract PROCESS_COMMUNICATION_STDOUT = ProcessCommunicationStdoutEvent PROCESS_COMMUNICATION_STDERR = ProcessCommunicationStderrEvent PROCESS_LOG = ProcessLogEvent PROCESS_LOG_STDOUT = ProcessLogStdoutEvent PROCESS_LOG_STDERR = ProcessLogStderrEvent REMOTE_COMMUNICATION = RemoteCommunicationEvent SUPERVISOR_STATE_CHANGE = SupervisorStateChangeEvent # abstract SUPERVISOR_STATE_CHANGE_RUNNING = SupervisorRunningEvent SUPERVISOR_STATE_CHANGE_STOPPING = SupervisorStoppingEvent TICK = TickEvent # abstract TICK_5 = Tick5Event TICK_60 = Tick60Event TICK_3600 = Tick3600Event PROCESS_GROUP = ProcessGroupEvent # abstract PROCESS_GROUP_ADDED = ProcessGroupAddedEvent PROCESS_GROUP_REMOVED = ProcessGroupRemovedEvent def getEventNameByType(requested): for name, typ in EventTypes.__dict__.items(): if typ is requested: return name def register(name, event): setattr(EventTypes, name, event)