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import asyncio

from engineio import packet as eio_packet

from socketio import packet

from .base_manager import BaseManager

class AsyncManager(BaseManager):

"""Manage a client list for an asyncio server."""

async def can_disconnect(self, sid, namespace):

return self.is_connected(sid, namespace)

async def emit(self, event, data, namespace, room=None, skip_sid=None,

callback=None, to=None, **kwargs):

"""Emit a message to a single client, a room, or all the clients

connected to the namespace.

Note: this method is a coroutine.

"""

room = to or room

if namespace not in self.rooms:

return

if isinstance(data, tuple):

# tuples are expanded to multiple arguments, everything else is

# sent as a single argument

data = list(data)

elif data is not None:

data = [data]

else:

data = []

if not isinstance(skip_sid, list):

skip_sid = [skip_sid]

tasks = []

if not callback:

# when callbacks aren't used the packets sent to each recipient are

# identical, so they can be generated once and reused

pkt = self.server.packet_class(

packet.EVENT, namespace=namespace, data=[event] + data)

encoded_packet = pkt.encode()

if not isinstance(encoded_packet, list):

encoded_packet = [encoded_packet]

eio_pkt = [eio_packet.Packet(eio_packet.MESSAGE, p)

for p in encoded_packet]

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

if sid not in skip_sid:

for p in eio_pkt:

tasks.append(asyncio.create_task(

self.server._send_eio_packet(eio_sid, p)))

else:

# callbacks are used, so each recipient must be sent a packet that

# contains a unique callback id

# note that callbacks when addressing a group of people are

# implemented but not tested or supported

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

if sid not in skip_sid: # pragma: no branch

id = self._generate_ack_id(sid, callback)

pkt = self.server.packet_class(

packet.EVENT, namespace=namespace, data=[event] + data,

id=id)

tasks.append(asyncio.create_task(

self.server._send_packet(eio_sid, pkt)))

if tasks == []: # pragma: no cover

return

await asyncio.wait(tasks)

async def connect(self, eio_sid, namespace):

"""Register a client connection to a namespace.

Note: this method is a coroutine.

"""

return super().connect(eio_sid, namespace)

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

"""Disconnect a client.

Note: this method is a coroutine.

"""

return self.basic_disconnect(sid, namespace, **kwargs)

async def enter_room(self, sid, namespace, room, eio_sid=None):

"""Add a client to a room.

Note: this method is a coroutine.

"""

return self.basic_enter_room(sid, namespace, room, eio_sid=eio_sid)

async def leave_room(self, sid, namespace, room):

"""Remove a client from a room.

Note: this method is a coroutine.

"""

return self.basic_leave_room(sid, namespace, room)

async def close_room(self, room, namespace):

"""Remove all participants from a room.

Note: this method is a coroutine.

"""

return self.basic_close_room(room, namespace)

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

"""Invoke an application callback.

Note: this method is a coroutine.

"""

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:

ret = callback(*data)

if asyncio.iscoroutine(ret):

try:

await ret

except asyncio.CancelledError: # pragma: no cover

pass