NOTICE: Based on current web trends and our own usage data, PubNub's Python Twisted SDK is deprecated as of May 1, 2019. Deprecation means we will no longer be updating the Python Twisted SDK but will continue to support users currently using it. Please feel free to use our other Python SDK offerings as they will continue to be supported and maintained. If you would like to use the Python Twisted SDK specifically, we would love to work with you on keeping this project alive!
The simplest way to get started is to install PubNub Python SDK via pypi:
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from pubnub.pubnub_twisted import PubNubTwisted
from pubnub.enums import PNStatusCategory from pubnub.pubnub_twisted import PubNubTwisted as PubNub from pubnub.pnconfiguration import PNConfiguration from twisted.internet import reactor from pubnub.callbacks import SubscribeCallback def main(): pnconf = PNConfiguration() pnconf.subscribe_key = 'demo' pnconf.publish_key = 'demo' pubnub = PubNub(pnconf) def my_publish_callback(result, status): # Check whether request successfully completed or not if not status.is_error(): envelope = result pass # Message successfully published to specified channel. else: pass # Handle message publish error. Check 'category' property to find out possible issue # because of which request did fail. # Request can be resent using: [status retry]; class MySubscribeCallback(SubscribeCallback): def presence(self, pubnub, presence): pass # handle incoming presence data def status(self, pubnub, status): if status.category == PNStatusCategory.PNUnexpectedDisconnectCategory: pass # This event happens when radio / connectivity is lost elif status.category == PNStatusCategory.PNConnectedCategory: # Connect event. You can do stuff like publish, and know you'll get it. # Or just use the connected event to confirm you are subscribed for # UI / internal notifications, etc pubnub.publish().channel("awesome_channel").message("Hello World!").pn_async(my_publish_callback) elif status.category == PNStatusCategory.PNReconnectedCategory: pass # Happens as part of our regular operation. This event happens when # radio / connectivity is lost, then regained. elif status.category == PNStatusCategory.PNDecryptionErrorCategory: pass # Handle message decryption error. Probably client configured to # encrypt messages and on live data feed it received plain text. def message(self, pubnub, message): # Handle new message stored in message.message pass pubnub.add_listener(MySubscribeCallback()) pubnub.subscribe().channels('awesome_channel').execute() reactor.callLater(30, pubnub.stop) # stop reactor loop after 30 seconds pubnub.start() if __name__ == '__main__': main()
Instantiate a new Pubnub instance. Only the
subscribe_key is mandatory. Also include
publish_key if you intend to publish from this instance, and the
secret_key if you wish to perform PAM administrative operations from this Python-Twisted V4 instance.
For security reasons you should only include the secret-key on a highly secured server. The secret-key is only required for granting rights using our Access Manager.
When you init with
from pubnub.pubnub_twisted import PubNubTwisted from pubnub.pnconfiguration import PNConfiguration pnconfig = PNConfiguration() pnconfig.subscribe_key = "my_subkey" pnconfig.publish_key = "my_pubkey" pnconfig.ssl = False pubnub = PubNubTwisted(pnconfig)
from pubnub.callbacks import SubscribeCallback class MySubscribeCallback(SubscribeCallback): def status(self, pubnub, status): pass # The status object returned is always related to subscribe but could contain # information about subscribe, heartbeat, or errors # use the operationType to switch on different options if status.operation == PNOperationType.PNSubscribeOperation \ or status.operation == PNOperationType.PNUnsubscribeOperation: if status.category == PNStatusCategory.PNConnectedCategory: pass # This is expected for a subscribe, this means there is no error or issue whatsoever elif status.category == PNStatusCategory.PNReconnectedCategory: pass # This usually occurs if subscribe temporarily fails but reconnects. This means # there was an error but there is no longer any issue elif status.category == PNStatusCategory.PNDisconnectedCategory: pass # This is the expected category for an unsubscribe. This means there # was no error in unsubscribing from everything elif status.category == PNStatusCategory.PNUnexpectedDisconnectCategory: pass # This is usually an issue with the internet connection, this is an error, handle # appropriately retry will be called automatically elif status.category == PNStatusCategory.PNAccessDeniedCategory: pass # This means that PAM does not allow this client to subscribe to this # channel and channel group configuration. This is another explicit error else: pass # This is usually an issue with the internet connection, this is an error, handle appropriately # retry will be called automatically elif status.operation == PNOperationType.PNSubscribeOperation: # Heartbeat operations can in fact have errors, so it is important to check first for an error. # For more information on how to configure heartbeat notifications through the status # PNObjectEventListener callback, consult http://www.pubnub.com/docs/python-twisted/api-reference-configuration#configuration if status.is_error(): pass # There was an error with the heartbeat operation, handle here else: pass # Heartbeat operation was successful else: pass # Encountered unknown status type def presence(self, pubnub, presence): pass # handle incoming presence data def message(self, pubnub, message): pass # handle incoming messages pubnub.add_listener(MySubscribeCallback())
my_listener = MySubscribeCallback() pubnub.add_listener(my_listener) # some time later pubnub.remove_listener(my_listener)
from pubnub.callbacks import SubscribeCallback from pubnub.enums import PNStatusCategory class HandleDisconnectsCallback(SubscribeCallback): def status(self, pubnub, status): if status.category == PNStatusCategory.PNUnexpectedDisconnectCategory: # internet got lost, do some magic and call reconnect when ready pubnub.reconnect() elif status.category == PNStatusCategory.PNTimeoutCategory: # do some magic and call reconnect when ready pubnub.reconnect() else: logger.debug(status) def presence(self, pubnub, presence): pass def message(self, pubnub, message): pass disconnect_listener = HandleDisconnectsCallback() pubnub.add_listener(disconnect_listener)
|Processing has failed because of request time out.|
|PubNub API server was unable to parse your request correctly.|
A subscribe event experienced an exception when running.
SDK was able to reconnect to PubNub.
SDK subscribed with a new mix of channels (fired every time the
|Request was cancelled by user.|
|No specific category was assigned to the request.|
time()to verify the client connectivity to the origin:
d = pubnub.time().deferred() d.addCallback(my_callback)
@gen.coroutine def publish_snippet(): def publish_callback(result, status): if not status.is_error(): envelope = result pass # Message successfully published to specified channel. else: pass # Handle message publish error. Check 'category' property to find out possible issue # because of which request did fail. # Request can be resent using: [status retry]; pubnub.publish().channel('such_channel').message(['hello', 'there']).pn_async(publish_callback)
here nowon the channel by UUID:
Requires that the
envelope = yield pubnub.here_now()\ .channels("my_channel", "demo")\ .include_uuids(True)\ .future() if envelope.status.is_error(): # handle error return for channel_data in envelope.result.channels: print("---") print("channel: %s" % channel_data.channel_name) print("occupancy: %s" % channel_data.occupancy) print("occupants: %s" % channel_data.channel_name) for occupant in channel_data.occupants: print("uuid: %s, state: %s" % (occupant.uuid, occupant.state))
timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on
Requires that the
pubnub.subscribe()\ .channels("my_channel")\ .with_presence()\ .execute()
Requires that the
envelope = yield pubnub.history()\ .channel("history_channel")\ .count(100)\ .future()