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session.py
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session.py
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import asyncio
import collections
import logging
from datetime import datetime, timedelta
from .protocol import STATE_NEW, STATE_OPEN, STATE_CLOSING, STATE_CLOSED
from .protocol import FRAME_OPEN, FRAME_CLOSE
from .protocol import FRAME_MESSAGE, FRAME_MESSAGE_BLOB, FRAME_HEARTBEAT
from .exceptions import SessionIsAcquired, SessionIsClosed
from .protocol import MSG_CLOSE, MSG_MESSAGE
from .protocol import close_frame, message_frame, messages_frame
from .protocol import SockjsMessage, OpenMessage, ClosedMessage
log = logging.getLogger('sockjs')
class Session(object):
""" SockJS session object
``state``: Session state
``manager``: Session manager that hold this session
``acquired``: Acquired state, indicates that transport is using session
``timeout``: Session timeout
"""
manager = None
acquired = False
state = STATE_NEW
interrupted = False
exception = None
def __init__(self, id, handler, *,
timeout=timedelta(seconds=10), loop=None, debug=False):
self.id = id
self.handler = handler
self.expired = False
self.timeout = timeout
self.expires = datetime.now() + timeout
self.loop = loop
self._hits = 0
self._heartbeats = 0
self._heartbeat_transport = False
self._debug = debug
self._waiter = None
self._queue = collections.deque()
def __str__(self):
result = ['id=%r' % (self.id,)]
if self.state == STATE_OPEN:
result.append('connected')
elif self.state == STATE_CLOSED:
result.append('closed')
else:
result.append('disconnected')
if self.acquired:
result.append('acquired')
if len(self._queue):
result.append('queue[%s]' % len(self._queue))
if self._hits:
result.append('hits=%s' % self._hits)
if self._heartbeats:
result.append('heartbeats=%s' % self._heartbeats)
return ' '.join(result)
def _tick(self, timeout=None):
self.expired = False
if timeout is None:
self.expires = datetime.now() + self.timeout
else:
self.expires = datetime.now() + timeout
@asyncio.coroutine
def _acquire(self, manager, heartbeat=True):
self.acquired = True
self.manager = manager
self._heartbeat_transport = heartbeat
self._tick()
self._hits += 1
if self.state == STATE_NEW:
log.debug('open session: %s', self.id)
self.state = STATE_OPEN
self._feed(FRAME_OPEN, FRAME_OPEN)
try:
yield from self.handler(OpenMessage, self)
except asyncio.CancelledError:
raise
except Exception as exc:
self.state = STATE_CLOSING
self.exception = exc
self.interrupted = True
self._feed(FRAME_CLOSE, (3000, 'Internal error'))
log.exception('Exceptin in open session handling.')
def _release(self):
self.acquired = False
self.manager = None
self._heartbeat_transport = False
def _heartbeat(self):
self.expired = False
self._tick()
self._heartbeats += 1
if self._heartbeat:
self._feed(FRAME_HEARTBEAT, FRAME_HEARTBEAT)
def _feed(self, frame, data):
# pack messages
if frame == FRAME_MESSAGE:
if self._queue and self._queue[-1][0] == FRAME_MESSAGE:
self._queue[-1][1].append(data)
else:
self._queue.append((frame, [data]))
else:
self._queue.append((frame, data))
# notify waiter
waiter = self._waiter
if waiter is not None:
self._waiter = None
if not waiter.cancelled():
waiter.set_result(True)
def _wait(self, pack=True):
if not self._queue and self.state != STATE_CLOSED:
assert not self._waiter
self._waiter = asyncio.Future(loop=self.loop)
yield from self._waiter
if self._queue:
frame, payload = self._queue.popleft()
if pack:
if frame == FRAME_CLOSE:
return FRAME_CLOSE, close_frame(*payload)
elif frame == FRAME_MESSAGE:
return FRAME_MESSAGE, messages_frame(payload)
return frame, payload
else:
raise SessionIsClosed()
@asyncio.coroutine
def _remote_close(self, exc=None):
"""close session from remote."""
if self.state in (STATE_CLOSING, STATE_CLOSED):
return
log.info('close session: %s', self.id)
self.state = STATE_CLOSING
if exc is not None:
self.exception = exc
self.interrupted = True
try:
yield from self.handler(SockjsMessage(MSG_CLOSE, exc), self)
except:
log.exception('Exceptin in close handler.')
@asyncio.coroutine
def _remote_closed(self):
if self.state == STATE_CLOSED:
return
log.info('session closed: %s', self.id)
self.state = STATE_CLOSED
self.expire()
try:
yield from self.handler(ClosedMessage, self)
except:
log.exception('Exceptin in closed handler.')
# notify waiter
waiter = self._waiter
if waiter is not None:
self._waiter = None
if not waiter.cancelled():
waiter.set_result(True)
@asyncio.coroutine
def _remote_message(self, msg):
log.debug('incoming message: %s, %s', self.id, msg[:200])
self._tick()
try:
yield from self.handler(SockjsMessage(MSG_MESSAGE, msg), self)
except:
log.exception('Exceptin in message handler.')
@asyncio.coroutine
def _remote_messages(self, messages):
self._tick()
for msg in messages:
log.debug('incoming message: %s, %s', self.id, msg[:200])
try:
yield from self.handler(SockjsMessage(MSG_MESSAGE, msg), self)
except:
log.exception('Exceptin in message handler.')
def expire(self):
"""Manually expire a session."""
self.expired = True
def send(self, msg):
"""send message to client."""
assert isinstance(msg, str), 'String is required'
if self._debug:
log.info('outgoing message: %s, %s', self.id, str(msg)[:200])
if self.state != STATE_OPEN:
return
self._tick()
self._feed(FRAME_MESSAGE, msg)
def send_frame(self, frm):
"""send message frame to client."""
if self._debug:
log.info('outgoing message: %s, %s', self.id, frm[:200])
if self.state != STATE_OPEN:
return
self._tick()
self._feed(FRAME_MESSAGE_BLOB, frm)
def close(self, code=3000, reason='Go away!'):
"""close session"""
if self.state in (STATE_CLOSING, STATE_CLOSED):
return
if self._debug:
log.debug('close session: %s', self.id)
self.state = STATE_CLOSING
self._feed(FRAME_CLOSE, (code, reason))
_marker = object()
class SessionManager(dict):
"""A basic session manager."""
_hb_handle = None # heartbeat event loop timer
_hb_task = None # gc task
def __init__(self, name, app, handler, loop,
heartbeat=25.0, timeout=timedelta(seconds=5), debug=False):
self.name = name
self.route_name = 'sockjs-url-%s' % name
self.app = app
self.handler = handler
self.factory = Session
self.acquired = {}
self.sessions = []
self.heartbeat = heartbeat
self.timeout = timeout
self.heartbeat = heartbeat
self.loop = loop
self.debug = debug
def route_url(self, request):
return request.route_url(self.route_name)
@property
def started(self):
return self._hb_handle is not None
def start(self):
if not self._hb_handle:
self._hb_handle = self.loop.call_later(
self.heartbeat, self._heartbeat)
def stop(self):
if self._hb_handle is not None:
self._hb_handle.cancel()
self._hb_handle = None
if self._hb_task is not None:
self._hb_task.cancel()
self._hb_task = None
def _heartbeat(self):
if self._hb_task is None:
self._hb_task = asyncio.async(
self._heartbeat_task(), loop=self.loop)
def _heartbeat_task(self):
sessions = self.sessions
if sessions:
now = datetime.now()
idx = 0
while idx < len(sessions):
session = sessions[idx]
if session.acquired:
session._heartbeat()
elif session.expires < now:
# Session is to be GC'd immedietely
if session.id in self.acquired:
yield from self.release(session)
if session.state == STATE_OPEN:
yield from session._remote_close()
if session.state == STATE_CLOSING:
yield from session._remote_closed()
del self[session.id]
del self.sessions[idx]
continue
idx += 1
self._hb_task = None
self._hb_handle = self.loop.call_later(
self.heartbeat, self._heartbeat)
def _add(self, session):
if session.expired:
raise ValueError('Can not add expired session')
session.manager = self
session.registry = self.app
self[session.id] = session
self.sessions.append(session)
return session
def get(self, id, create=False, request=None, default=_marker):
session = super(SessionManager, self).get(id, None)
if session is None:
if create:
session = self._add(
self.factory(
id, self.handler,
timeout=self.timeout,
loop=self.loop, debug=self.debug))
else:
if default is not _marker:
return default
raise KeyError(id)
return session
@asyncio.coroutine
def acquire(self, s):
sid = s.id
if sid in self.acquired:
raise SessionIsAcquired('Another connection still open')
if sid not in self:
raise KeyError('Unknown session')
yield from s._acquire(self)
self.acquired[sid] = True
return s
def is_acquired(self, session):
return session.id in self.acquired
@asyncio.coroutine
def release(self, s):
if s.id in self.acquired:
s._release()
del self.acquired[s.id]
def active_sessions(self):
for session in self.values():
if not session.expired:
yield session
@asyncio.coroutine
def clear(self):
"""Manually expire all sessions in the pool."""
for session in list(self.values()):
if session.state != STATE_CLOSED:
yield from session._remote_closed()
self.sessions.clear()
super(SessionManager, self).clear()
def broadcast(self, message):
blob = message_frame(message)
for session in self.values():
if not session.expired:
session.send_frame(blob)
def __del__(self):
self.clear()
self.stop()