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|
try:
from hashlib import sha256
digestmod = sha256
except ImportError:
import Crypto.Hash.SHA256 as digestmod
sha256 = digestmod.new
import hmac
class EmptyLock():
def __enter__(self):
pass
def __exit__(self,a,b,c):
pass
empty_lock = EmptyLock()
class PubnubCoreAsync(PubnubBase):
def start(self): pass
def stop(self): pass
def __init__(
self,
publish_key,
subscribe_key,
secret_key = False,
cipher_key = False,
auth_key = None,
ssl_on = False,
origin = 'pubsub.pubnub.com',
uuid = None,
_tt_lock=empty_lock,
_channel_list_lock=empty_lock
) :
"""
#**
#* Pubnub
#*
#* Init the Pubnub Client API
#*
#* @param string publish_key required key to send messages.
#* @param string subscribe_key required key to receive messages.
#* @param string secret_key required key to sign messages.
#* @param boolean ssl required for 2048 bit encrypted messages.
#* @param string origin PUBNUB Server Origin.
#**
## Initiat Class
pubnub = Pubnub( 'PUBLISH-KEY', 'SUBSCRIBE-KEY', 'SECRET-KEY', False )
"""
super(PubnubCoreAsync, self).__init__(
publish_key=publish_key,
subscribe_key=subscribe_key,
secret_key=secret_key,
cipher_key=cipher_key,
auth_key=auth_key,
ssl_on=ssl_on,
origin=origin,
UUID=uuid
)
self.subscriptions = {}
self.timetoken = 0
self.last_timetoken = 0
self.version = '3.3.4'
self.accept_encoding = 'gzip'
self.SUB_RECEIVER = None
self._connect = None
self._tt_lock = _tt_lock
self._channel_list_lock = _channel_list_lock
self._connect = lambda: None
def get_channel_list(self, channels):
channel = ''
first = True
with self._channel_list_lock:
for ch in channels:
if not channels[ch]['subscribed']:
continue
if not first:
channel += ','
else:
first = False
channel += ch
return channel
def get_channel_array(self):
channels = self.subscriptions
channel = []
with self._channel_list_lock:
for ch in channels:
if not channels[ch]['subscribed']:
continue
channel.append(ch)
return channel
def each(l, func):
if func is None:
return
for i in l:
func(i)
def subscribe( self, channel, callback, error=None, connect=None, disconnect=None, reconnect=None, sync=False ) :
"""
#**
#* Subscribe
#*
#* This is NON-BLOCKING.
#* Listen for a message on a channel.
#*
#* @param array args with channel and message.
#* @return false on fail, array on success.
#**
## Subscribe Example
def receive(message) :
print(message)
return True
## On Connect Callback
def connected() :
pubnub.publish({
'channel' : 'hello_world',
'message' : { 'some_var' : 'text' }
})
## Subscribe
pubnub.subscribe({
'channel' : 'hello_world',
'connect' : connected,
'callback' : receive
})
"""
with self._tt_lock:
self.last_timetoken = self.timetoken if self.timetoken != 0 else self.last_timetoken
self.timetoken = 0
if sync is True and self.susbcribe_sync is not None:
self.susbcribe_sync(args)
return
def _invoke(func,msg=None):
if func is not None:
if msg is not None:
func(msg)
else:
func()
def _invoke_connect():
if self._channel_list_lock:
with self._channel_list_lock:
for ch in self.subscriptions:
chobj = self.subscriptions[ch]
if chobj['connected'] is False:
chobj['connected'] = True
_invoke(chobj['connect'],chobj['name'])
def _invoke_error(channel_list=None, err=None):
if channel_list is None:
for ch in self.subscriptions:
chobj = self.subscriptions[ch]
_invoke(chobj['error'],err)
else:
for ch in channel_list:
chobj = self.subscriptions[ch]
_invoke(chobj['error'],err)
def _get_channel():
for ch in self.subscriptions:
chobj = self.subscriptions[ch]
if chobj['subscribed'] is True:
return chobj
## New Channel?
if not channel in self.subscriptions or self.subscriptions[channel]['subscribed'] is False:
with self._channel_list_lock:
self.subscriptions[channel] = {
'name' : channel,
'first' : False,
'connected' : False,
'subscribed' : True,
'callback' : callback,
'connect' : connect,
'disconnect' : disconnect,
'reconnect' : reconnect,
'error' : error
}
## return if already connected to channel
if channel in self.subscriptions and 'connected' in self.subscriptions[channel] and self.subscriptions[channel]['connected'] is True:
_invoke(error, "Already Connected")
return
## SUBSCRIPTION RECURSION
def _connect():
self._reset_offline()
def sub_callback(response):
## ERROR ?
if not response or ('message' in response and response['message'] == 'Forbidden'):
_invoke_error(response['payload']['channels'], response['message'])
_connect()
return
_invoke_connect()
with self._tt_lock:
self.timetoken = self.last_timetoken if self.timetoken == 0 and self.last_timetoken != 0 else response[1]
if len(response) > 2:
channel_list = response[2].split(',')
response_list = response[0]
for ch in enumerate(channel_list):
if ch[1] in self.subscriptions:
chobj = self.subscriptions[ch[1]]
_invoke(chobj['callback'],self.decrypt(response_list[ch[0]]))
else:
response_list = response[0]
chobj = _get_channel()
for r in response_list:
if chobj:
_invoke(chobj['callback'], self.decrypt(r))
_connect()
channel_list = self.get_channel_list(self.subscriptions)
if len(channel_list) <= 0:
return
## CONNECT TO PUBNUB SUBSCRIBE SERVERS
try:
self.SUB_RECEIVER = self._request( { "urlcomponents" : [
'subscribe',
self.subscribe_key,
channel_list,
'0',
str(self.timetoken)
], "urlparams" : {"uuid":self.uuid, "auth" : self.auth_key} }, sub_callback, sub_callback, single=True )
except Exception as e:
print(e)
self.timeout( 1, _connect)
return
self._connect = _connect
## BEGIN SUBSCRIPTION (LISTEN FOR MESSAGES)
_connect()
def _reset_offline(self):
if self.SUB_RECEIVER is not None:
self.SUB_RECEIVER()
self.SUB_RECEIVER = None
def CONNECT(self):
self._reset_offline()
self._connect()
def unsubscribe( self, channel ):
if channel in self.subscriptions is False:
return False
## DISCONNECT
with self._channel_list_lock:
if channel in self.subscriptions:
self.subscriptions[channel]['connected'] = 0
self.subscriptions[channel]['subscribed'] = False
self.subscriptions[channel]['timetoken'] = 0
self.subscriptions[channel]['first'] = False
self.CONNECT()
|
