Duplicate messages in Slack channel

Rasa version: 1.1.4

Python version: 3.6.8

Operating system (windows, osx, …): Windows + ngrok

Issue: When I send message to Slack channel, bot answering to me multiple times: Here was an issue with same problem: https://github.com/RasaHQ/rasa/issues/2120

At ngrok logs I see, what User-Agent: Slackbot 1.0 keeps POST me messages with headers:

X-Slack-Retry-Num: 1
X-Slack-Retry-Reason: http_timeout

X-Slack-Retry-Num: 2
X-Slack-Retry-Reason: http_timeout

As I see in slack.py, here is something like workaround for my problem: https://github.com/RasaHQ/rasa/blob/master/rasa/core/channels/slack.py#L148

I’ve tried to modify credentials.yml:

slack:
  slack_token: "xoxb-****"
  errors_ignore_retry: "http_timeout"

But it doesn’t work. (same problem on production server with docker)

Summarizing:

1. Slack duplicate messages to bot with reason of http_timeout even when no custom_actions executed (just utter from domain.yml)
2. Bot replies to every retry attempt
3. I can’t bypass http_timeout with errors_ignore_retry

Could you advice please?

[cuongnda]

Hi, I’m facing very similar issue. After checking the source code, there is code for handle retry case but I spot this: https://github.com/RasaHQ/rasa/blob/e002d095134d52afbd4474a77738739957263db6/rasa/core/channels/slack.py#L256

retry_reason = request.headers.get("HTTP_X_SLACK_RETRY_REASON")
retry_count = request.headers.get("HTTP_X_SLACK_RETRY_NUM")

When I read the request from slack, it turn out that slack sending the request with different headers (“x-slack-retry-reason” and “x-slack-retry-num”) so I changed the code to:

retry_reason = request.headers.get("x-slack-retry-reason")
retry_count = request.headers.get("x-slack-retry-num")

And now it is working as expected. I’m not sure if we can set this text as variable instead of hardcoded string?

[cuongnda]

Hi, I’ve created PR here, please take a look: https://github.com/RasaHQ/rasa/pull/4081