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bazarr/libs3/socketio/base_manager.py
Louis Vézina e562d5e7bb WIP
2020-01-20 19:35:55 -05:00

178 lines
6.3 KiB
Python

import itertools
import logging
import six
default_logger = logging.getLogger('socketio')
class BaseManager(object):
"""Manage client connections.
This class keeps track of all the clients and the rooms they are in, to
support the broadcasting of messages. The data used by this class is
stored in a memory structure, making it appropriate only for single process
services. More sophisticated storage backends can be implemented by
subclasses.
"""
def __init__(self):
self.logger = None
self.server = None
self.rooms = {}
self.callbacks = {}
self.pending_disconnect = {}
def set_server(self, server):
self.server = server
def initialize(self):
"""Invoked before the first request is received. Subclasses can add
their initialization code here.
"""
pass
def get_namespaces(self):
"""Return an iterable with the active namespace names."""
return six.iterkeys(self.rooms)
def get_participants(self, namespace, room):
"""Return an iterable with the active participants in a room."""
for sid, active in six.iteritems(self.rooms[namespace][room].copy()):
yield sid
def connect(self, sid, namespace):
"""Register a client connection to a namespace."""
self.enter_room(sid, namespace, None)
self.enter_room(sid, namespace, sid)
def is_connected(self, sid, namespace):
if namespace in self.pending_disconnect and \
sid in self.pending_disconnect[namespace]:
# the client is in the process of being disconnected
return False
try:
return self.rooms[namespace][None][sid]
except KeyError:
pass
def pre_disconnect(self, sid, namespace):
"""Put the client in the to-be-disconnected list.
This allows the client data structures to be present while the
disconnect handler is invoked, but still recognize the fact that the
client is soon going away.
"""
if namespace not in self.pending_disconnect:
self.pending_disconnect[namespace] = []
self.pending_disconnect[namespace].append(sid)
def disconnect(self, sid, namespace):
"""Register a client disconnect from a namespace."""
if namespace not in self.rooms:
return
rooms = []
for room_name, room in six.iteritems(self.rooms[namespace].copy()):
if sid in room:
rooms.append(room_name)
for room in rooms:
self.leave_room(sid, namespace, room)
if sid in self.callbacks and namespace in self.callbacks[sid]:
del self.callbacks[sid][namespace]
if len(self.callbacks[sid]) == 0:
del self.callbacks[sid]
if namespace in self.pending_disconnect and \
sid in self.pending_disconnect[namespace]:
self.pending_disconnect[namespace].remove(sid)
if len(self.pending_disconnect[namespace]) == 0:
del self.pending_disconnect[namespace]
def enter_room(self, sid, namespace, room):
"""Add a client to a room."""
if namespace not in self.rooms:
self.rooms[namespace] = {}
if room not in self.rooms[namespace]:
self.rooms[namespace][room] = {}
self.rooms[namespace][room][sid] = True
def leave_room(self, sid, namespace, room):
"""Remove a client from a room."""
try:
del self.rooms[namespace][room][sid]
if len(self.rooms[namespace][room]) == 0:
del self.rooms[namespace][room]
if len(self.rooms[namespace]) == 0:
del self.rooms[namespace]
except KeyError:
pass
def close_room(self, room, namespace):
"""Remove all participants from a room."""
try:
for sid in self.get_participants(namespace, room):
self.leave_room(sid, namespace, room)
except KeyError:
pass
def get_rooms(self, sid, namespace):
"""Return the rooms a client is in."""
r = []
try:
for room_name, room in six.iteritems(self.rooms[namespace]):
if room_name is not None and sid in room and room[sid]:
r.append(room_name)
except KeyError:
pass
return r
def emit(self, event, data, namespace, room=None, skip_sid=None,
callback=None, **kwargs):
"""Emit a message to a single client, a room, or all the clients
connected to the namespace."""
if namespace not in self.rooms or room not in self.rooms[namespace]:
return
if not isinstance(skip_sid, list):
skip_sid = [skip_sid]
for sid in self.get_participants(namespace, room):
if sid not in skip_sid:
if callback is not None:
id = self._generate_ack_id(sid, namespace, callback)
else:
id = None
self.server._emit_internal(sid, event, data, namespace, id)
def trigger_callback(self, sid, namespace, id, data):
"""Invoke an application callback."""
callback = None
try:
callback = self.callbacks[sid][namespace][id]
except KeyError:
# if we get an unknown callback we just ignore it
self._get_logger().warning('Unknown callback received, ignoring.')
else:
del self.callbacks[sid][namespace][id]
if callback is not None:
callback(*data)
def _generate_ack_id(self, sid, namespace, callback):
"""Generate a unique identifier for an ACK packet."""
namespace = namespace or '/'
if sid not in self.callbacks:
self.callbacks[sid] = {}
if namespace not in self.callbacks[sid]:
self.callbacks[sid][namespace] = {0: itertools.count(1)}
id = six.next(self.callbacks[sid][namespace][0])
self.callbacks[sid][namespace][id] = callback
return id
def _get_logger(self):
"""Get the appropriate logger
Prevents uninitialized servers in write-only mode from failing.
"""
if self.logger:
return self.logger
elif self.server:
return self.server.logger
else:
return default_logger