JS Bolt: Receiving multiple requests from a single app_mention event on AWS Lambda

Description

Hi! So my application is listening for an app_mention event, which it then passes on to a function that sends a message in the channel as a response. However, when I send a message to my bot, I usually receive more than one response from it in the chat. I have read that this can be caused by timeouts and retries, but it looks as if (according to my logs) the handling of the event is happening in well under 3 seconds. Any ideas? Do I need to manually return a 200 OK with the bolt framework?

Thank you!!

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I’ve read and understood the Contributing guidelines and have done my best effort to follow them.
• I’ve read and agree to the Code of Conduct.
• I’ve searched for any related issues and avoided creating a duplicate issue.

---

Bug Report

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Reproducible in:

package version:

node version:

OS version(s):

Steps to reproduce:

Expected result:

A single response

Actual result:

Multiple responses

Attachments:

Here is a picture of the issue (Note that the bot responses arrived within >1 second of one another):

Here are the logs:

START RequestId: 78572cf9-b2b8-457f-a167-c64feead09f8 Version: $LATEST
--
2021-05-11T21:46:25.356Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	event { resource: '/slack/events',  path: '/slack/events',  httpMethod: 'POST',  headers:   { Accept: '*/*',     'Accept-Encoding': 'gzip,deflate',     'CloudFront-Forwarded-Proto': 'https',     'CloudFront-Is-Desktop-Viewer': 'true',     'CloudFront-Is-Mobile-Viewer': 'false',     'CloudFront-Is-SmartTV-Viewer': 'false',     'CloudFront-Is-Tablet-Viewer': 'false',     'CloudFront-Viewer-Country': 'US',     'Content-Type': 'application/json',     Host: 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com',     'User-Agent': 'Slackbot 1.0 (+https://api.slack.com/robots)',     Via:      '1.1 5d9ef69d47a63c80a41bbcf6902f6312.cloudfront.net (CloudFront)',     'X-Amz-Cf-Id': 'LSHwIlEtnu8XRsiN04J1mFMvfClIUdhJaCLdcONxhYb2o84J2yYDrA==',     'X-Amzn-Trace-Id': 'Root=1-609afb30-17f8de1675b8f91038856b4e',     'X-Forwarded-For': '3.230.154.183, 70.132.32.69',     'X-Forwarded-Port': '443',     'X-Forwarded-Proto': 'https',     'X-Slack-Request-Timestamp': '1620769584',     'X-Slack-Signature':      'v0=5844681c76930b3a7a208b3e74a6910867a9bcb0e52f97bd9c7c8e4c0cada5c1' },  multiValueHeaders:   { Accept: [ '*/*' ],     'Accept-Encoding': [ 'gzip,deflate' ],     'CloudFront-Forwarded-Proto': [ 'https' ],     'CloudFront-Is-Desktop-Viewer': [ 'true' ],     'CloudFront-Is-Mobile-Viewer': [ 'false' ],     'CloudFront-Is-SmartTV-Viewer': [ 'false' ],     'CloudFront-Is-Tablet-Viewer': [ 'false' ],     'CloudFront-Viewer-Country': [ 'US' ],     'Content-Type': [ 'application/json' ],     Host: [ 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com' ],     'User-Agent': [ 'Slackbot 1.0 (+https://api.slack.com/robots)' ],     Via:      [ '1.1 5d9ef69d47a63c80a41bbcf6902f6312.cloudfront.net (CloudFront)' ],     'X-Amz-Cf-Id':      [ 'LSHwIlEtnu8XRsiN04J1mFMvfClIUdhJaCLdcONxhYb2o84J2yYDrA==' ],     'X-Amzn-Trace-Id': [ 'Root=1-609afb30-17f8de1675b8f91038856b4e' ],     'X-Forwarded-For': [ '3.230.154.183, 70.132.32.69' ],     'X-Forwarded-Port': [ '443' ],     'X-Forwarded-Proto': [ 'https' ],     'X-Slack-Request-Timestamp': [ '1620769584' ],     'X-Slack-Signature':      [ 'v0=5844681c76930b3a7a208b3e74a6910867a9bcb0e52f97bd9c7c8e4c0cada5c1' ] },  queryStringParameters: null,  multiValueQueryStringParameters: null,  pathParameters: null,  stageVariables: null,  requestContext:   { resourceId: 'tbpie9',     resourcePath: '/slack/events',     httpMethod: 'POST',     extendedRequestId: 'fLwvjH8ToAMFQfw=',     requestTime: '11/May/2021:21:46:24 +0000',     path: '/dev/slack/events',     accountId: '777509510706',     protocol: 'HTTP/1.1',     stage: 'dev',     domainPrefix: 'p5kspcf2i4',     requestTimeEpoch: 1620769584218,     requestId: 'e5f91597-3c3e-47d6-b582-7b85d039637f',     identity:      { cognitoIdentityPoolId: null,        accountId: null,        cognitoIdentityId: null,        caller: null,        sourceIp: '3.230.154.183',        principalOrgId: null,        accessKey: null,        cognitoAuthenticationType: null,        cognitoAuthenticationProvider: null,        userArn: null,        userAgent: 'Slackbot 1.0 (+https://api.slack.com/robots)',        user: null },     domainName: 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com',     apiId: 'p5kspcf2i4' },  body:   '{"token":"BVfjr7IiFj2CpDbCyIlivx9o","team_id":"T01RMJFCGTV","api_app_id":"A01RMCE7UGJ","event":{"client_msg_id":"e8856ee1-cfac-4f15-a7e7-6d29446f986c","type":"app_mention","text":"<@U01RJA6K3UM> schedules pause workflow","user":"U01SB6CHSTA","ts":"1620769583.007100","team":"T01RMJFCGTV","blocks":[{"type":"rich_text","block_id":"JEtp","elements":[{"type":"rich_text_section","elements":[{"type":"user","user_id":"U01RJA6K3UM"},{"type":"text","text":" schedules pause workflow"}]}]}],"channel":"C021LEAQNV8","event_ts":"1620769583.007100"},"type":"event_callback","event_id":"Ev02166LDHSB","event_time":1620769583,"authorizations":[{"enterprise_id":null,"team_id":"T01RMJFCGTV","user_id":"U01RJA6K3UM","is_bot":true,"is_enterprise_install":false}],"is_ext_shared_channel":false,"event_context":"2-app_mention-T01RMJFCGTV-A01RMCE7UGJ-C021LEAQNV8"}',  isBase64Encoded: false }
2021-05-11T21:46:26.117Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 initialized
2021-05-11T21:46:26.118Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 apiCall('auth.test') start
2021-05-11T21:46:26.176Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 will perform http request
2021-05-11T21:46:26.177Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 apiCall('auth.test') start
2021-05-11T21:46:26.177Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 will perform http request
2021-05-11T21:46:26.456Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 http response received
2021-05-11T21:46:26.457Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:1 initialized
2021-05-11T21:46:26.458Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  bolt-app Conversation context failed loading for ID: C021LEAQNV8, error: Conversation not found
2021-05-11T21:46:26.536Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:0 http response received
2021-05-11T21:46:26.636Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	inside user auth before context
2021-05-11T21:46:26.636Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	inside app mention
2021-05-11T21:46:26.637Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	inside pause workflow
2021-05-11T21:46:27.017Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:1 apiCall('chat.postEphemeral') start
2021-05-11T21:46:27.018Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:1 will perform http request
2021-05-11T21:46:27.208Z	78572cf9-b2b8-457f-a167-c64feead09f8	DEBUG	[DEBUG]  web-api:WebClient:1 http response received
2021-05-11T21:46:27.208Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	finished with everything
2021-05-11T21:46:27.208Z	78572cf9-b2b8-457f-a167-c64feead09f8	INFO	app mention is finished
END RequestId: 78572cf9-b2b8-457f-a167-c64feead09f8
REPORT RequestId: 78572cf9-b2b8-457f-a167-c64feead09f8	Duration: 1915.52 ms	Billed Duration: 1916 ms	Memory Size: 128 MB	Max Memory Used: 105 MB	Init Duration: 743.28 ms
START RequestId: e6c2edba-3230-4eef-8fb9-47b2edeb56e4 Version: $LATEST
2021-05-11T21:46:27.324Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	event { resource: '/slack/events',  path: '/slack/events',  httpMethod: 'POST',  headers:   { Accept: '*/*',     'Accept-Encoding': 'gzip,deflate',     'CloudFront-Forwarded-Proto': 'https',     'CloudFront-Is-Desktop-Viewer': 'true',     'CloudFront-Is-Mobile-Viewer': 'false',     'CloudFront-Is-SmartTV-Viewer': 'false',     'CloudFront-Is-Tablet-Viewer': 'false',     'CloudFront-Viewer-Country': 'US',     'Content-Type': 'application/json',     Host: 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com',     'User-Agent': 'Slackbot 1.0 (+https://api.slack.com/robots)',     Via:      '1.1 f92491812e422470607f365e923929b5.cloudfront.net (CloudFront)',     'X-Amz-Cf-Id': 'JQuHCnQbetL5eUIp3nIaMEKudWURC5ucZj8vZuXoYuYVlyeGGABIxA==',     'X-Amzn-Trace-Id': 'Root=1-609afb33-6bf02ee521f42a765f53eab7',     'X-Forwarded-For': '54.196.88.72, 70.132.32.150',     'X-Forwarded-Port': '443',     'X-Forwarded-Proto': 'https',     'X-Slack-Request-Timestamp': '1620769587',     'X-Slack-Retry-Num': '1',     'X-Slack-Retry-Reason': 'http_timeout',     'X-Slack-Signature':      'v0=7bf9d3438f13308fad873a1695f9b1ec2767909f30ca56e1d0becf33acb9b6ab' },  multiValueHeaders:   { Accept: [ '*/*' ],     'Accept-Encoding': [ 'gzip,deflate' ],     'CloudFront-Forwarded-Proto': [ 'https' ],     'CloudFront-Is-Desktop-Viewer': [ 'true' ],     'CloudFront-Is-Mobile-Viewer': [ 'false' ],     'CloudFront-Is-SmartTV-Viewer': [ 'false' ],     'CloudFront-Is-Tablet-Viewer': [ 'false' ],     'CloudFront-Viewer-Country': [ 'US' ],     'Content-Type': [ 'application/json' ],     Host: [ 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com' ],     'User-Agent': [ 'Slackbot 1.0 (+https://api.slack.com/robots)' ],     Via:      [ '1.1 f92491812e422470607f365e923929b5.cloudfront.net (CloudFront)' ],     'X-Amz-Cf-Id':      [ 'JQuHCnQbetL5eUIp3nIaMEKudWURC5ucZj8vZuXoYuYVlyeGGABIxA==' ],     'X-Amzn-Trace-Id': [ 'Root=1-609afb33-6bf02ee521f42a765f53eab7' ],     'X-Forwarded-For': [ '54.196.88.72, 70.132.32.150' ],     'X-Forwarded-Port': [ '443' ],     'X-Forwarded-Proto': [ 'https' ],     'X-Slack-Request-Timestamp': [ '1620769587' ],     'X-Slack-Retry-Num': [ '1' ],     'X-Slack-Retry-Reason': [ 'http_timeout' ],     'X-Slack-Signature':      [ 'v0=7bf9d3438f13308fad873a1695f9b1ec2767909f30ca56e1d0becf33acb9b6ab' ] },  queryStringParameters: null,  multiValueQueryStringParameters: null,  pathParameters: null,  stageVariables: null,  requestContext:   { resourceId: 'tbpie9',     resourcePath: '/slack/events',     httpMethod: 'POST',     extendedRequestId: 'fLwwCF40oAMFpbQ=',     requestTime: '11/May/2021:21:46:27 +0000',     path: '/dev/slack/events',     accountId: '777509510706',     protocol: 'HTTP/1.1',     stage: 'dev',     domainPrefix: 'p5kspcf2i4',     requestTimeEpoch: 1620769587313,     requestId: 'c3ca4c54-05f8-42ce-b433-3be44b6fa201',     identity:      { cognitoIdentityPoolId: null,        accountId: null,        cognitoIdentityId: null,        caller: null,        sourceIp: '54.196.88.72',        principalOrgId: null,        accessKey: null,        cognitoAuthenticationType: null,        cognitoAuthenticationProvider: null,        userArn: null,        userAgent: 'Slackbot 1.0 (+https://api.slack.com/robots)',        user: null },     domainName: 'p5kspcf2i4.execute-api.us-east-1.amazonaws.com',     apiId: 'p5kspcf2i4' },  body:   '{"token":"BVfjr7IiFj2CpDbCyIlivx9o","team_id":"T01RMJFCGTV","api_app_id":"A01RMCE7UGJ","event":{"client_msg_id":"e8856ee1-cfac-4f15-a7e7-6d29446f986c","type":"app_mention","text":"<@U01RJA6K3UM> schedules pause workflow","user":"U01SB6CHSTA","ts":"1620769583.007100","team":"T01RMJFCGTV","blocks":[{"type":"rich_text","block_id":"JEtp","elements":[{"type":"rich_text_section","elements":[{"type":"user","user_id":"U01RJA6K3UM"},{"type":"text","text":" schedules pause workflow"}]}]}],"channel":"C021LEAQNV8","event_ts":"1620769583.007100"},"type":"event_callback","event_id":"Ev02166LDHSB","event_time":1620769583,"authorizations":[{"enterprise_id":null,"team_id":"T01RMJFCGTV","user_id":"U01RJA6K3UM","is_bot":true,"is_enterprise_install":false}],"is_ext_shared_channel":false,"event_context":"2-app_mention-T01RMJFCGTV-A01RMCE7UGJ-C021LEAQNV8"}',  isBase64Encoded: false }
2021-05-11T21:46:27.377Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 initialized
2021-05-11T21:46:27.377Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 apiCall('auth.test') start
2021-05-11T21:46:27.377Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 will perform http request
2021-05-11T21:46:27.378Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 apiCall('auth.test') start
2021-05-11T21:46:27.394Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 will perform http request
2021-05-11T21:46:27.495Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 http response received
2021-05-11T21:46:27.515Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:2 http response received
2021-05-11T21:46:27.515Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:3 initialized
2021-05-11T21:46:27.515Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  bolt-app Conversation context failed loading for ID: C021LEAQNV8, error: Conversation not found
2021-05-11T21:46:27.535Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	inside user auth before context
2021-05-11T21:46:27.535Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	inside app mention
2021-05-11T21:46:27.535Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	inside pause workflow
2021-05-11T21:46:27.635Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:3 apiCall('chat.postEphemeral') start
2021-05-11T21:46:27.635Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:3 will perform http request
2021-05-11T21:46:27.778Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	DEBUG	[DEBUG]  web-api:WebClient:3 http response received
2021-05-11T21:46:27.778Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	finished with everything
2021-05-11T21:46:27.778Z	e6c2edba-3230-4eef-8fb9-47b2edeb56e4	INFO	app mention is finished
END RequestId: e6c2edba-3230-4eef-8fb9-47b2edeb56e4
REPORT RequestId: e6c2edba-3230-4eef-8fb9-47b2edeb56e4	Duration: 474.76 ms	Billed Duration: 475 ms	Memory Size: 128 MB	Max Memory Used: 106 MB

And here is the src (some info removed):

// Handle the Lambda function event
module.exports.handler = async (event) => {
 

  // Initialize your custom receiver
  const expressReceiver = new ExpressReceiver({
    signingSecret: secrets['SLACK_SIGNING_SECRET'],
    // The `processBeforeResponse` option is required for all FaaS environments.
    // It allows Bolt methods (e.g. `app.message`) to handle a Slack request
    // before the Bolt framework responds to the request (e.g. `ack()`). This is
    // important because FaaS immediately terminate handlers after the response.
    processBeforeResponse: true
  });

  // Initializes your app with your bot token and the AWS Lambda ready receiver
  const app = new App({
    processBeforeResponse: true,
    token: secrets['SLACK_BOT_TOKEN'],
    receiver: expressReceiver,
    logLevel: LogLevel.DEBUG,
  });


  app.event('app_mention', async ({ event, client, context , body}) => {
    console.log("inside app mention")
    let command = event.text.split(" ")

    if (command.length === 1){
      await handlers.invalid.invalid_handler({ event, client, context, body })
    } else if (command[1] in topic_event_handlers) {
      let operation = command[1]
      await topic_event_handlers[operation]({ event, client, context, command, body })
    } else {
      await handlers.invalid.invalid_handler({ event, client, context, body})
    }

    console.log("app mention is finished")

  });

  




 return serverlessExpress({
    app: expressReceiver.app
  })(event)

};

[seratch]

Is this already supported in Bolt JS? Or is this a recommendation that is not implemented.

Sorry, my comment there might be a bit confusing. I proposed the way in the issue but it’s not yet implemented.

I’m hoping you can recommend a solution to support these long-running requests.

Only the recommendation at the moment is to do something like this in your own code. Another way is to use a queue like SQS to start time-consuming operation as a separate AWS Lambda function.

app.command("/hello", ({ body, ack }) => {
  const lambda = new AWS.Lambda();
  const params: AWS.Lambda.InvocationRequest = {
    InvocationType: 'Event', // async invocation
    FunctionName: functionName,
    Payload: JSON.stringify(body)
  };
  const lambdaInvocation = await lambda.invoke(params).promise();
  // check the lambdaInvocation here
  ack();
});

I know this is not an ideal solution for you but bolt-js won’t come up with a new solution for AWS Lambda support at least in the short term.

[seratch]

@AdamInTheOculus Yes, this is feasible. I’ve created something similar before: https://github.com/seratch/deepl-for-slack#shortcut-to-run-deepl-translate-api

This example app displays loading modal view when acknowledging a view_submission request. And then, the app calls views.update API to show the translation result once it’s ready. The app does not run as-is on AWS Lambda but if you move this part to another Lambda function, it behaves as you mentioned.