Server Component not receiving all MUC messages

[Pasquale Puzio]

Hi,

we want to build a simple server component which receives all messages sent to MUC rooms (we have many rooms and new ones are being created all the time) and, after processing some of these messages, performs some operations.

We don't want our server component to act like a bot, so we don't want it to reply to messages or things like that, we just want to receive copies of messages in order to process some of them.

To do so, we have followed the tutorial available here: https://sleekxmpp.readthedocs.io/en/latest/getting_started/component.html

The problem is that the component seems to receive only some of the messages (approximately 1 out of 5).

Also, we are observing a weird behavior: message delivery seems to be "exclusive", meaning that a message is delivered either to clients or to the server component, which is weird. In other words, 1 message out of 5 is delivered to the server component, and the remaining 4 are delivered to clients as usual.

Here's our component code (we have tried with bot sleekxmpp and slixmpp but we always have the same behavior):

import sys

import logging

#import sleekxmpp

#from sleekxmpp.componentxmpp import ComponentXMPP

import slixmpp

from slixmpp.componentxmpp import ComponentXMPP

if sys.version_info < (3, 0):

        from sleekxmpp.util.misc_ops import setdefaultencoding

        setdefaultencoding('utf8')

else:

        raw_input = input

class NotificationsComponent(ComponentXMPP):

        def __init__(self):

                ComponentXMPP.__init__(self, "muc.ourservice.it", "secret", "jabber.ourservice.it", 5233)

                # add handler

                self.add_event_handler("message", self.message)

                #self.add_event_handler("groupchat_message", self.message)

        def message(self, msg):

                if msg['type'] == 'groupchat':

                        print('Received group chat message')

                        print(msg)

                        #msg.reply('Well received').send()

                else:

                        print('Received another message')

if __name__ == '__main__':

        logging.basicConfig(level=logging.DEBUG,format='%(levelname)-8s %(message)s')

        xmpp = NotificationsComponent()

        xmpp.register_plugin('xep_0030') # Service Discovery

        #xmpp.register_plugin('xep_0004') # Data Forms

        #xmpp.register_plugin('xep_0060') # PubSub

        xmpp.register_plugin('xep_0199') # XMPP Ping

        #xmpp.register_plugin('xep_0045') # MUC

        # Connect to the XMPP server and start processing XMPP stanzas.

        xmpp.connect()

        xmpp.process()

and here's a snippet of our ejabberd 18.03 configuration:

listen:

  - 

    port: 5222

    ip: "::"

    module: ejabberd_c2s

    starttls: true

    certfile: 'CERTFILE'

    protocol_options: 'TLSOPTS'

    ## dhfile: 'DHFILE'

    ## ciphers: 'CIPHERS'

    ##

    ## To enforce TLS encryption for client connections,

    ## use this instead of the "starttls" option:

    ##

    starttls_required: true

    ##

    ## Stream compression

    ##

    zlib: true

    ##

    max_stanza_size: 65536

    shaper: none

    access: c2s

  - 

    port: 5280

    ip: "::"

    module: ejabberd_http

    request_handlers:

      "/admin": ejabberd_web_admin

      "/bosh": mod_bosh

    #request_handlers:

    #  "/ws": ejabberd_http_ws

    #  "/bosh": mod_bosh

    #  "/api": mod_http_api

    ##  "/pub/archive": mod_http_fileserver

    web_admin: true

    http_bind: true

    ## register: true

    captcha: false

    certfile: 'CERTFILE'

    tls: true

  -

    port: 5233

    ip: "::"

    module: ejabberd_service

    access: all

    privilege_access:

      message: "outgoing"

    password: "secret"

    shaper: none

we have also tried to play with access, privilege_access and things like that but no luck.

Do you have any idea what might cause this weird behavior? Is there any particular plugin or module that should be enabled?

Thanks

[Pasquale Puzio]

Of course, we have enabled debug logs on both sleekxmpp and ejabberd, but we don't see any errors, it's just that messages are missing.

[Pasquale Puzio]

We did one more test. Even by using the official echo component example available in the repository, we have the same issue. So it looks like there is some issue at our server, maybe.

Any help would be appreciated.

Thanks