axolotl: NoSessionException

[jlguardi]

After some hours of running with axolotl enabled, after keys transfer, I've recieved the following exception:

Traceback (most recent call last):
  File "run.py", line 54, in <module>
    stack.loop() #this is the program mainloop
  File "./yowsup/stacks/yowstack.py", line 57, in loop
    asyncore.loop(*args, **kwargs)
  File "/usr/lib/python2.7/asyncore.py", line 216, in loop
    poll_fun(timeout, map)
  File "/usr/lib/python2.7/asyncore.py", line 156, in poll
    read(obj)
  File "/usr/lib/python2.7/asyncore.py", line 87, in read
    obj.handle_error()
  File "/usr/lib/python2.7/asyncore.py", line 83, in read
    obj.handle_read_event()
  File "/usr/lib/python2.7/asyncore.py", line 449, in handle_read_event
    self.handle_read()
  File "./yowsup/layers/network/layer.py", line 48, in handle_read
    self.receive(data)
  File "./yowsup/layers/network/layer.py", line 55, in receive
    self.toUpper(data)
  File "./yowsup/layers/__init__.py", line 56, in toUpper
    self.__upper.receive(data)
  File "./yowsup/layers/stanzaregulator/layer.py", line 28, in receive
    self.processReceived()
  File "./yowsup/layers/stanzaregulator/layer.py", line 51, in processReceived
    self.processReceived()
  File "./yowsup/layers/stanzaregulator/layer.py", line 48, in processReceived
    self.toUpper(oneMessageData)
  File "./yowsup/layers/__init__.py", line 56, in toUpper
    self.__upper.receive(data)
  File "./yowsup/layers/auth/layer_crypt.py", line 63, in receive
    self.toUpper(payload)
  File "./yowsup/layers/__init__.py", line 56, in toUpper
    self.__upper.receive(data)
  File "./yowsup/layers/coder/layer.py", line 35, in receive
    self.toUpper(node)
  File "./yowsup/layers/__init__.py", line 56, in toUpper
    self.__upper.receive(data)
  File "./yowsup/layers/logger/layer.py", line 14, in receive
    self.toUpper(data)
  File "./yowsup/layers/__init__.py", line 56, in toUpper
    self.__upper.receive(data)
  File "./yowsup/layers/axolotl/layer.py", line 99, in receive
    self.onMessage(protocolTreeNode)
  File "./yowsup/layers/axolotl/layer.py", line 117, in onMessage
    self.handleEncMessage(protocolTreeNode)
  File "./yowsup/layers/axolotl/layer.py", line 175, in handleEncMessage
    self.handleWhisperMessage(node)
  File "./yowsup/layers/axolotl/layer.py", line 195, in handleWhisperMessage
    plaintext = sessionCipher.decryptMsg(whisperMessage)
  File "/usr/local/lib/python2.7/dist-packages/python_axolotl-0.1.1-py2.7.egg/axolotl/sessioncipher.py", line 65, in decryptMsg
    raise NoSessionException("No session for: %s, %s" % (self.recipientId, self.deviceId))
axolotl.nosessionexception.NoSessionException: No session for: 3xxxxxxxxxx, 1

I've restarted some times and I've working again my app but I don't really know what happened.

[tgalal]

did you at some point delete your axolotl.db and requested new keys ?

[jlguardi]

I think no. I mean, I was playing with keys in other lines but this one is in production and I think I just created keys and run my app.
No keys delete or modifications.

[tgalal]

the number you login with in production, is it the same you used outside production?

[jlguardi]

No, never.

[tgalal]

Alright, can you retry login for about another 6 times and then this error will go away because whatsapp will stop sending the message to you. And then send a message to this number from yowsup, this should then create the missing session, and hopefully fixes the problem.

[jlguardi]

If I start yowsup-cli, it fixes my problem. So I suppose it is because my application layer.py. So I think it isn't a yowsup error.
I will analyze and report anything.

[jlguardi]

After send a message with to encrypted destination, I receive sometimes the following sequence:

1.- send message to encrypted destination
2.- received message ack (so I will no resend)
3.- received and ack'd message

<receipt type="retry" from="3xxxxxxx@s.whatsapp.net" id="142xxxxx-1" t="1422xxxxx"
<retry count="1" t="1422xxxxx" id="142xxxx-1" v="1">
</retry>
<registration>
xxxx
HEX:xxxxx
</registration>
</receipt>

So my message is never received and I marked as sent.

What should I do?

[bmutinda]

I did some changes- try, except in some sections of yowsup(axolotl layer and protocol_message entity) and the issue was completely fixed.
Check my comment here #683

[aesedepece]

This information could be valuable:

Party A: latest Yowsup 2 with Android Env 2.12.67, Axolotl enabled
Party B: Bq E5 FHD smartphone with WhatsApp official apk 2.12.84, Axolotl enabled

Keys are queried but returned key list is empty:

DEBUG:yowsup.layers.logger.layer:tx:
<iq to="s.whatsapp.net" xmlns="encrypt" type="get">
  <key>
    <user jid="(partyb)@s.whatsapp.net"></user>
  </key>
</iq>

DEBUG:yowsup.layers.logger.layer:rx:
<iq type="result" from="s.whatsapp.net">
  <list></list>
</iq>

As the key list is empty, we don't get any key and any incoming message from party B can't be deciphered and following exception is raised:

NoSessionException: No session for: (partyb), 1

Then party B uninstalls WhatsApp, installs a more recent version 2.12.94 and gets a new key.
Now I can perfectly fetch the new key and decipher incoming messages:

DEBUG:yowsup.layers.logger.layer:tx:
<iq to="s.whatsapp.net" xmlns="encrypt" type="get">
  <key>
    <user jid="(partyb)@s.whatsapp.net"></user>
  </key>
</iq>

DEBUG:yowsup.layers.logger.layer:rx:
<iq type="result" from="s.whatsapp.net">
  <list>
    <user jid="(partyb)@s.whatsapp.net">
      <registration>����</registration>
      <type></type>
      <identity>�������z�n$�bw����o�JMb�O(�k��y</identity>
      <skey>
        <id></id>
        <value>��F5q��vQ�b2�JE��d5;����1���6��Y</value>
        <signature>���ܹ�0=0>6�i�M���1u����e�)38���Lt1�;Y������ɲ��L���JDZ\��</signature>
      </skey>
      <key>
        <id>�{�</id>
        <value>�)���蠪�%�����<y�S��G���E���u</value>
      </key>
    </user>
  </list>
</iq>

Maybe some WhatsApp versions (i.e.: 2.12.84) fail to publish their keys?
What do you think, @tgalal?

[tgalal]

Please try code from develop branch