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import itertools

import logging

from bidict import bidict, ValueDuplicationError

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.rooms[namespace][room][sio_sid] = eio_sid

self.eio_to_sid = {}

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 self.rooms.keys()

def get_participants(self, namespace, room):

"""Return an iterable with the active participants in a room."""

ns = self.rooms[namespace]

if hasattr(room, '__len__') and not isinstance(room, str):

participants = ns[room[0]]._fwdm.copy() if room[0] in ns else {}

for r in room[1:]:

participants.update(ns[r]._fwdm if r in ns else {})

else:

participants = ns[room]._fwdm.copy() if room in ns else {}

for sid, eio_sid in participants.items():

yield sid, eio_sid

def connect(self, eio_sid, namespace):

"""Register a client connection to a namespace."""

sid = self.server.eio.generate_id()

try:

self.enter_room(sid, namespace, None, eio_sid=eio_sid)

except ValueDuplicationError:

# already connected

return None

self.enter_room(sid, namespace, sid, eio_sid=eio_sid)

return 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] is not None

except KeyError:

pass

return False

def sid_from_eio_sid(self, eio_sid, namespace):

try:

return self.rooms[namespace][None]._invm[eio_sid]

except KeyError:

pass

def eio_sid_from_sid(self, sid, namespace):

if namespace in self.rooms:

return self.rooms[namespace][None].get(sid)

def can_disconnect(self, sid, namespace):

return self.is_connected(sid, namespace)

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)

return self.rooms[namespace][None].get(sid)

def disconnect(self, sid, namespace, **kwargs):

"""Register a client disconnect from a namespace."""

if namespace not in self.rooms:

return

rooms = []

for room_name, room in self.rooms[namespace].copy().items():

if sid in room:

rooms.append(room_name)

for room in rooms:

self.leave_room(sid, namespace, room)

if sid in self.callbacks:

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, eio_sid=None):

"""Add a client to a room."""

if eio_sid is None and namespace not in self.rooms:

raise ValueError('sid is not connected to requested namespace')

if namespace not in self.rooms:

self.rooms[namespace] = {}

if room not in self.rooms[namespace]:

self.rooms[namespace][room] = bidict()

if eio_sid is None:

eio_sid = self.rooms[namespace][None][sid]

self.rooms[namespace][room][sid] = eio_sid

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 self.rooms[namespace].items():

if room_name is not None and sid in room:

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:

return

if not isinstance(skip_sid, list):

skip_sid = [skip_sid]

for sid, eio_sid in self.get_participants(namespace, room):

if sid not in skip_sid:

if callback is not None:

id = self._generate_ack_id(sid, callback)

else:

id = None

self.server._emit_internal(eio_sid, event, data, namespace, id)

def trigger_callback(self, sid, id, data):

"""Invoke an application callback."""

callback = None

try:

callback = self.callbacks[sid][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][id]

if callback is not None:

callback(*data)

def _generate_ack_id(self, sid, callback):

"""Generate a unique identifier for an ACK packet."""

if sid not in self.callbacks:

self.callbacks[sid] = {0: itertools.count(1)}

id = next(self.callbacks[sid][0])

self.callbacks[sid][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