socketIO-client/socketIO_client/__init__.py
Roy Hyunjin Han f9e093efbb Fixes #7 and #16
2013-04-26 10:19:41 -07:00

444 lines
14 KiB
Python

import requests
import socket
from json import dumps, loads
from threading import Thread, Event
from time import sleep
from websocket import WebSocketConnectionClosedException, create_connection
PROTOCOL = 1 # socket.io protocol version
class BaseNamespace(object): # pragma: no cover
'Define socket.io behavior'
def __init__(self, _socketIO, path):
self._socketIO = _socketIO
self._path = path
self._callbackByEvent = {}
self.initialize()
def initialize(self):
'Initialize custom variables here; you can override this method'
pass
def on_connect(self):
'Called when socket is connecting; you can override this method'
pass
def on_disconnect(self):
'Called when socket is disconnecting; you can override this method'
pass
def on_error(self, reason, advice):
'Called when server sends an error; you can override this method'
print '[Error] %s' % advice
def on_message(self, data):
'Called when server sends a message; you can override this method'
print '[Message] %s' % data
def on_event(self, event, *args):
"""
Called when server emits an event; you can override this method.
Called only if the program cannot find a more specific event handler,
such as one defined by namespace.on('my_event', my_function).
"""
callback, args = find_callback(args)
arguments = [repr(_) for _ in args]
if callback:
arguments.append('callback(*args)')
callback(*args)
print '[Event] %s(%s)' % (event, ', '.join(arguments))
def on_open(self, *args):
print '[Open]', args
def on_close(self, *args):
print '[Close]', args
def on_retry(self, *args):
print '[Retry]', args
def on_reconnect(self, *args):
print '[Reconnect]', args
def message(self, data='', callback=None):
self._socketIO.message(data, callback, path=self._path)
def emit(self, event, *args, **kw):
kw['path'] = self._path
self._socketIO.emit(event, *args, **kw)
def on(self, event, callback):
'Define a callback to handle a custom event emitted by the server'
self._callbackByEvent[event] = callback
def _get_eventCallback(self, event):
# Check callbacks defined by on()
try:
return self._callbackByEvent[event]
except KeyError:
pass
# Check callbacks defined explicitly or use on_event()
callback = lambda *args: self.on_event(event, *args)
return getattr(self, 'on_' + event.replace(' ', '_'), callback)
class SocketIO(object):
def __init__(self, host, port, secure=False, headers=None, proxies=None):
"""
Create a socket.io client that connects to a socket.io server
at the specified host and port. Set secure=True to use HTTPS / WSS.
SocketIO('localhost', 8000, secure=True,
proxies={'https': 'https://proxy.example.com:8080'})
"""
self._socketIO = _SocketIO(host, port, secure, headers, proxies)
self._namespaceByPath = {}
self.define(BaseNamespace) # Define default namespace
self._rhythmicThread = _RhythmicThread(
self._socketIO.heartbeatInterval,
self._socketIO.send_heartbeat)
self._rhythmicThread.start()
self._listenerThread = _ListenerThread(
self._socketIO,
self._namespaceByPath)
self._listenerThread.start()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.disconnect()
def __del__(self):
self.disconnect(close=False)
@property
def connected(self):
return self._socketIO.connected
def disconnect(self, path='', close=True):
if self.connected:
self._socketIO.disconnect(path, close)
if path:
del self._namespaceByPath[path]
else:
self._rhythmicThread.cancel()
self._listenerThread.cancel()
def define(self, Namespace, path=''):
if path:
self._socketIO.connect(path)
namespace = Namespace(self._socketIO, path)
self._namespaceByPath[path] = namespace
return namespace
def get_namespace(self, path=''):
return self._namespaceByPath[path]
def on(self, event, callback, path=''):
return self.get_namespace(path).on(event, callback)
def message(self, data='', callback=None, path=''):
self._socketIO.message(data, callback, path)
def emit(self, event, *args, **kw):
self._socketIO.emit(event, *args, **kw)
def wait(self, seconds=None):
if seconds:
self._listenerThread.wait(seconds)
else:
try:
while self.connected:
sleep(1)
except KeyboardInterrupt:
pass
def wait_for_callbacks(self, seconds=None):
self._listenerThread.wait_for_callbacks(seconds)
class _RhythmicThread(Thread):
'Execute call every few seconds'
daemon = True
def __init__(self, intervalInSeconds, call, *args, **kw):
super(_RhythmicThread, self).__init__()
self.intervalInSeconds = intervalInSeconds
self.call = call
self.args = args
self.kw = kw
self.done = Event()
def run(self):
while not self.done.is_set():
self.call(*self.args, **self.kw)
self.done.wait(self.intervalInSeconds)
def cancel(self):
self.done.set()
class _ListenerThread(Thread):
'Process messages from socket.io server'
daemon = True
def __init__(self, _socketIO, _namespaceByPath):
super(_ListenerThread, self).__init__()
self._socketIO = _socketIO
self._namespaceByPath = _namespaceByPath
self.done = Event()
self.ready = Event()
self.ready.set()
def cancel(self):
self.done.set()
def wait(self, seconds):
self.done.wait(seconds)
def wait_for_callbacks(self, seconds):
self.ready.clear()
self.ready.wait(seconds)
def get_ackCallback(self, packetID):
return lambda *args: self._socketIO.ack(packetID, *args)
def run(self):
while not self.done.is_set():
try:
code, packetID, path, data = self._socketIO.recv_packet()
except SocketIOConnectionError, error:
print error
self.cancel()
break
except SocketIOPacketError, error:
print error
continue
try:
namespace = self._namespaceByPath[path]
except KeyError:
print 'Received unexpected path (%s)' % path
continue
try:
delegate = {
'0': self.on_disconnect,
'1': self.on_connect,
'2': self.on_heartbeat,
'3': self.on_message,
'4': self.on_json,
'5': self.on_event,
'6': self.on_ack,
'7': self.on_error,
}[code]
except KeyError:
print 'Received unexpected code (%s)' % code
continue
delegate(packetID, namespace._get_eventCallback, data)
def on_disconnect(self, packetID, get_eventCallback, data):
get_eventCallback('disconnect')()
def on_connect(self, packetID, get_eventCallback, data):
get_eventCallback('connect')()
def on_heartbeat(self, packetID, get_eventCallback, data):
pass
def on_message(self, packetID, get_eventCallback, data):
args = [data]
if packetID:
args.append(self.get_ackCallback(packetID))
get_eventCallback('message')(*args)
def on_json(self, packetID, get_eventCallback, data):
args = [loads(data)]
if packetID:
args.append(self.get_ackCallback(packetID))
get_eventCallback('message')(*args)
def on_event(self, packetID, get_eventCallback, data):
valueByName = loads(data)
event = valueByName['name']
args = valueByName.get('args', [])
if packetID:
args.append(self.get_ackCallback(packetID))
get_eventCallback(event)(*args)
def on_ack(self, packetID, get_eventCallback, data):
dataParts = data.split('+', 1)
messageID = int(dataParts[0])
args = loads(dataParts[1]) if len(dataParts) > 1 else []
callback = self._socketIO.get_messageCallback(messageID)
if not callback:
return
callback(*args)
if not self._socketIO.has_messageCallback:
self.ready.set()
def on_error(self, packetID, get_eventCallback, data):
reason, advice = data.split('+', 1)
get_eventCallback('error')(reason, advice)
class _SocketIO(object):
'Low-level interface to remove cyclic references in child threads'
messageID = 0
def __init__(self, host, port, secure, headers, proxies):
baseURL = '%s:%d/socket.io/%s' % (host, port, PROTOCOL)
targetScheme = 'https' if secure else 'http'
targetURL = '%s://%s/' % (targetScheme, baseURL)
try:
response = requests.get(
targetURL,
headers=headers,
proxies=proxies)
except IOError: # pragma: no cover
raise SocketIOError('Could not start connection')
if 200 != response.status_code: # pragma: no cover
raise SocketIOError('Could not establish connection')
responseParts = response.text.split(':')
sessionID = responseParts[0]
heartbeatTimeout = int(responseParts[1])
# connectionTimeout = int(responseParts[2])
supportedTransports = responseParts[3].split(',')
if 'websocket' not in supportedTransports:
raise SocketIOError('Could not parse handshake')
socketScheme = 'wss' if secure else 'ws'
socketURL = '%s://%s/websocket/%s' % (socketScheme, baseURL, sessionID)
self.connection = create_connection(socketURL)
self.heartbeatInterval = heartbeatTimeout - 2
self.callbackByMessageID = {}
def __del__(self):
self.disconnect(close=False)
def disconnect(self, path='', close=True):
if not self.connected:
return
if path:
self.send_packet(0, path)
elif close:
self.connection.close()
def connect(self, path):
self.send_packet(1, path)
def send_heartbeat(self):
try:
self.send_packet(2)
except SocketIOPacketError:
print 'Could not send heartbeat'
pass
def message(self, data, callback, path):
if isinstance(data, basestring):
code = 3
packetData = data
else:
code = 4
packetData = dumps(data, ensure_ascii=False)
self.send_packet(code, path, packetData, callback)
def emit(self, event, *args, **kw):
callback, args = find_callback(args, kw)
packetData = dumps(dict(name=event, args=args), ensure_ascii=False)
path = kw.get('path', '')
self.send_packet(5, path, packetData, callback)
def ack(self, packetID, *args):
packetID = packetID.rstrip('+')
packetData = '%s+%s' % (
packetID,
dumps(args, ensure_ascii=False),
) if args else packetID
self.send_packet(6, data=packetData)
def set_messageCallback(self, callback):
'Set callback that will be called after receiving an acknowledgment'
self.messageID += 1
self.callbackByMessageID[self.messageID] = callback
return '%s+' % self.messageID
def get_messageCallback(self, messageID):
try:
callback = self.callbackByMessageID[messageID]
del self.callbackByMessageID[messageID]
return callback
except KeyError:
return
@property
def has_messageCallback(self):
return True if self.callbackByMessageID else False
def recv_packet(self):
try:
packet = self.connection.recv()
except WebSocketConnectionClosedException:
text = 'Lost connection (Connection closed)'
raise SocketIOConnectionError(text)
except socket.timeout:
text = 'Lost connection (Connection timed out)'
raise SocketIOConnectionError(text)
except socket.error:
text = 'Lost connection'
raise SocketIOConnectionError(text)
try:
packetParts = packet.split(':', 3)
except AttributeError:
raise SocketIOPacketError('Received invalid packet (%s)' % packet)
packetCount = len(packetParts)
code, packetID, path, data = None, None, None, None
if 4 == packetCount:
code, packetID, path, data = packetParts
elif 3 == packetCount:
code, packetID, path = packetParts
elif 1 == packetCount:
code = packetParts[0]
return code, packetID, path, data
def send_packet(self, code, path='', data='', callback=None):
packetID = self.set_messageCallback(callback) if callback else ''
packetParts = [str(code), packetID, path, data]
try:
packet = ':'.join(packetParts)
self.connection.send(packet)
except socket.error:
raise SocketIOPacketError('Could not send packet')
@property
def connected(self):
return self.connection.connected
class SocketIOError(Exception):
pass
class SocketIOConnectionError(SocketIOError):
pass
class SocketIOPacketError(SocketIOError):
pass
def find_callback(args, kw=None):
'Return callback whether passed as a last argument or as a keyword'
if args and callable(args[-1]):
return args[-1], args[:-1]
try:
return kw['callback'], args
except (KeyError, TypeError):
return None, args