Specifying Input Channel over REST API not giving channel-specific response

Rasa Open Source
1

We are trying to connect our message pipeline to Rasa and would like to get channel specific responses over a single REST endpoint, e.g. (via postman):

http://localhost:5005/webhooks/mychannel/webhook/

{
	"sender": "alex",
	"message": "hi",
	"input_channel": "mychannel"
}

#also tried:

{
	"sender": "alex",
	"message": "hi",
	"input_channel": "whatsapp"
}

domain.yml excerpt (model was deleted completely and retrained):

responses:
  utter_greet:
    - channel: "mychannel"
      text: "Custom Channel"
    - channel: "whatsapp"
      text: "Whatsapp Channel"
    - text: "Default Channel"

The channel is set in credentials.yml and the logs show, that the custom webhook endpoint is registered. credentials.yml:

rest:
my_connector.CustomChannel:

The connector implementation is basically identical to rasa.core.channels.channel.RestInput with:

class CustomChannel(InputChannel):
    @classmethod
    def name(cls) -> Text:
        return "mychannel"

    @staticmethod
    async def on_message_wrapper...

The result is always:

[
    {
        "recipient_id": "alex",
        "text": "Default Channel"
    }
]

Versions:

rasa==1.8.3
rasa-sdk==1.10.1
rasa-x==0.26.3

What did I miss?

2

@alxbar I believe the missing piece that the OutputChannel has to overwrite the name() function (instead of the InputChannel) as you currently did.

3

Yes, I tried this over the weekend and it worked

class WhatsappOutput(CollectingOutputChannel):

    @classmethod
    def name(cls) -> Text:
        return "whatsapp"