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connection.py
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connection.py
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import json
import asyncio
from typing import Optional, NoReturn
import aioxmpp
import aioxmpp.connector
import aioxmpp.xso
import OpenSSL
from aiofcm.logging import logger
from aiofcm.common import Message, MessageResponse, STATUS_SUCCESS
from aiofcm.exceptions import ConnectionClosed
class FCMMessage(aioxmpp.xso.XSO):
TAG = ('google:mobile:data', 'gcm')
text = aioxmpp.xso.Text(default=None)
aioxmpp.stanza.Message.fcm_payload = aioxmpp.xso.Child([FCMMessage])
class FCMMessageType:
ACK = 'ack'
NACK = 'nack'
class FCMXMPPConnection:
FCM_HOST = 'fcm-xmpp.googleapis.com'
FCM_PORT = 5235
INACTIVITY_TIME = 10
def __init__(self, sender_id, api_key, loop=None, max_requests=1000):
self.max_requests = max_requests
self.xmpp_client = self._create_client(sender_id, api_key, loop)
self.loop = loop
self._wait_connection = asyncio.Future()
self.inactivity_timer = None
self.requests = {}
def _create_client(self, sender_id, api_key, loop=None) -> aioxmpp.Client:
xmpp_client = aioxmpp.Client(
local_jid=aioxmpp.JID.fromstr('%s@gcm.googleapis.com' % sender_id),
security_layer=aioxmpp.make_security_layer(api_key),
override_peer=[
(self.FCM_HOST, self.FCM_PORT,
aioxmpp.connector.XMPPOverTLSConnector())
],
loop=loop
)
xmpp_client.on_stream_established.connect(
lambda: self._wait_connection.set_result(True)
)
xmpp_client.on_stream_destroyed.connect(
self._on_stream_destroyed
)
xmpp_client.on_failure.connect(
lambda exc: self._wait_connection.set_exception(exc)
)
xmpp_client.stream.register_message_callback(
type_=aioxmpp.MessageType.NORMAL,
from_=None,
cb=self.on_response
)
return xmpp_client
@property
def connected(self):
return self.xmpp_client.running
async def connect(self):
self.xmpp_client.start()
await self._wait_connection
self.refresh_inactivity_timer()
def close(self):
if self.inactivity_timer:
self.inactivity_timer.cancel()
logger.debug('Closing connection %s', self)
self.xmpp_client.stop()
def _on_stream_destroyed(self, reason=None):
reason = reason or ConnectionClosed()
logger.debug('Stream of %s was destroyed: %s', self, reason)
self.xmpp_client.stop()
if self.inactivity_timer:
self.inactivity_timer.cancel()
for request in self.requests.values():
if not request.done():
request.set_exception(reason)
def on_response(self, message):
self.refresh_inactivity_timer()
body = json.loads(message.fcm_payload.text)
try:
message_id = body['message_id']
message_type = body['message_type']
except KeyError:
logger.warning('Got strange response: %s', body)
return
if message_type not in (FCMMessageType.ACK, FCMMessageType.NACK):
return
request = self.requests.pop(message_id, None)
if not request:
logger.warning('Got response for unknown message %s', message_id)
return
if message_type == FCMMessageType.ACK:
result = MessageResponse(message_id, STATUS_SUCCESS)
request.set_result(result)
elif message_type == FCMMessageType.NACK:
status = body['error']
description = body['error_description']
result = MessageResponse(message_id, status, description)
request.set_result(result)
async def send_message(self, message):
if not self.connected:
await self.connect()
msg = aioxmpp.Message(
type_=aioxmpp.MessageType.NORMAL
)
payload = FCMMessage()
payload_body = message.as_dict()
payload.text = json.dumps(payload_body)
msg.fcm_payload = payload
future_response = asyncio.Future()
self.requests[message.message_id] = future_response
self.refresh_inactivity_timer()
try:
await self.xmpp_client.stream.send(msg)
except Exception:
self.requests.pop(message.message_id)
raise
response = await future_response
return response
def refresh_inactivity_timer(self):
if self.inactivity_timer:
self.inactivity_timer.cancel()
self.inactivity_timer = self.loop.call_later(
self.INACTIVITY_TIME, self.close)
@property
def is_busy(self):
return len(self.requests) >= self.max_requests
class FCMConnectionPool:
MAX_ATTEMPTS = 10
def __init__(self, sender_id, api_key, max_connections=10, loop=None):
# type: (int, str, int, Optional[asyncio.AbstractEventLoop]) -> NoReturn
self.sender_id = sender_id
self.api_key = api_key
self.max_connections = max_connections
self.loop = loop or asyncio.get_event_loop()
self.connections = []
self._lock = asyncio.Lock(loop=self.loop)
self.loop.set_exception_handler(self.__exception_handler)
async def connect(self) -> FCMXMPPConnection:
connection = FCMXMPPConnection(
sender_id=self.sender_id,
api_key=self.api_key,
loop=self.loop,
)
await connection.connect()
logger.info('Connection established (total: %d)',
len(self.connections) + 1)
return connection
def close(self):
for connection in self.connections:
connection.close()
async def create_connection(self):
connection = await self.connect()
self.connections.append(connection)
async def acquire(self) -> FCMXMPPConnection:
for connection in self.connections:
if not connection.is_busy:
return connection
else:
await self._lock.acquire()
for connection in self.connections:
if not connection.is_busy:
self._lock.release()
return connection
if len(self.connections) < self.max_connections:
try:
connection = await self.connect()
except Exception as e:
logger.error('Could not connect to server: %s', e)
self._lock.release()
raise ConnectionError
self.connections.append(connection)
self._lock.release()
return connection
else:
self._lock.release()
while True:
await asyncio.sleep(0.01)
for connection in self.connections:
if not connection.is_busy:
return connection
async def send_message(self, message: Message) -> MessageResponse:
attempt = 0
while True:
attempt += 1
if attempt > self.MAX_ATTEMPTS:
logger.warning('Trying to send message %s: attempt #%s',
message.message_id, attempt)
logger.debug('Message %s: waiting for connection',
message.message_id)
try:
connection = await self.acquire()
except ConnectionError:
logger.warning('Could not send notification %s due to '
'connection problem', message.message_id)
await asyncio.sleep(1)
continue
logger.debug('Message %s: connection %s acquired',
message.message_id, connection)
try:
response = await connection.send_message(message)
return response
except ConnectionClosed:
logger.warning('Could not send message %s: '
'ConnectionClosed', message.message_id)
except Exception as e:
logger.error('Could not send message %s: %s',
message.message_id, e)
@staticmethod
def __exception_handler(_, context):
exc = context.get('exception')
if not isinstance(exc, OpenSSL.SSL.SysCallError):
logger.exception(exc)