Troubleshooting PubNub Python-Tornado SDK

How to enable logging

Use this code to enable logging: 

import pubnub
import logging

pubnub.set_stream_logger('pubnub', logging.DEBUG)

How to find the version of your SDK

You can access your SDK version via constant: 

from pubnub import PubNubTornado

PubNubTornado.SDK_VERSION

Error handling with future()

In case of future() calls errors will be wrapped out by either TornadoEnvelope or PubNubTornadoException which both implement two object fields:

  • e.result - a request result object in case of success, otherwise None
  • e.status - PNStatus object with useful information about the finished request. You may check if it was an error or a success using e.is_error() helper.

future() usage: 

@gen.coroutine
def publish_future():
    e = yield pubnub.publish().channel("my_channel").message("hello!").future()
    if e.is_error():
        print("Error %s" % str(e))
        print("Error category #%d" % e.status.category)
        return
    else:
        print(str(e.result))

Error handling with result()

result() calls will return you just a result of the request without any state information. Errors should be caught using try/except blocks. For server-side errors a e.status field is populated to provide you more information about the request:

@gen.coroutine
def publish_result():
    try:
        result = yield pubnub.publish().channel("my_channel").message("hello!").result()
        print(str(result))
    except PubNubException as e:
        print("Error %s" % str(e))
        if e.status is not None:
            print("Error category #%d" % e.status.category)
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