wrap() never returns, causing timeout

[kpeters-cbsi]

This is a Bug Report

Description

• What went wrong? Lambda handler using wrap() does not return, causing function to time out
• What did you expect should have happened? handler should have returned
• What was the config (if any) you used? None
• What stacktrace or error message did you see? Request timed out

Similar or dependent issues:

• N/A

Additional Data

• Which powertool package are you using?: lambda-powertools-pattern-basic
• Which version are you using?: 1.27.0
• Middy engine version you're using: 1.4.0
• Operating System: AWS Lambda / NodeJS
• Stack Trace: N/A
• Provider Error messages: N/A

Note that this only seems to happen in Lambdas using mysql2/promise

[shawnm0705]

It's probably because you have something that is still up which doesn't end the event loop (e.g. database connection)
try to use https://www.npmjs.com/package/@middy/do-not-wait-for-empty-event-loop and set it to something like this:

const doNotWaitForEmptyEventLoop = require('@middy/do-not-wait-for-empty-event-loop');

exports.handler = wrap(serverless(app)).use(doNotWaitForEmptyEventLoop({
  runOnBefore: true,
  runOnAfter: true,
  runOnError: true,
}));

[kpeters-cbsi]

Thanks, I'll try that!

…

On Mon, Jan 11, 2021 at 10:09 PM Shawn Ma ***@***.***> wrote: <External Email> It's probably because you have something that is still up which doesn't end the event loop (e.g. database connection) try to use ***@***.***/do-not-wait-for-empty-event-loop <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.npmjs.com_package_-40middy_do-2Dnot-2Dwait-2Dfor-2Dempty-2Devent-2Dloop&d=DwMCaQ&c=jGUuvAdBXp_VqQ6t0yah2g&r=TTXL98RIPQNjLdDSgeT8-yL45AVQu-9EyYWqGxjCNjqPZing27cmWboo1qWURfVf&m=lfPv-6yBDkcHt5izF4aF42U7hyOXDtg5LQN0tccc7nk&s=jEYWb7cv330LP3mB51Dj4Hool4pVZ0nMWnenVU3iPIw&e=> and set it to something like this: const doNotWaitForEmptyEventLoop = ***@***.***/do-not-wait-for-empty-event-loop'); exports.handler = wrap(serverless(app)).use(doNotWaitForEmptyEventLoop({ runOnBefore: true, runOnAfter: true, runOnError: true, })); — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_getndazn_dazn-2Dlambda-2Dpowertools_issues_239-23issuecomment-2D758384035&d=DwMCaQ&c=jGUuvAdBXp_VqQ6t0yah2g&r=TTXL98RIPQNjLdDSgeT8-yL45AVQu-9EyYWqGxjCNjqPZing27cmWboo1qWURfVf&m=lfPv-6yBDkcHt5izF4aF42U7hyOXDtg5LQN0tccc7nk&s=MH4mDvY2Mu1cGkHvLOW2i7POuAXdRYwVD9g63y_u5y8&e=>, or unsubscribe <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_notifications_unsubscribe-2Dauth_AMOAKPVESUXJXSN7YQSMPK3SZPDOLANCNFSM4T2NBAFA&d=DwMCaQ&c=jGUuvAdBXp_VqQ6t0yah2g&r=TTXL98RIPQNjLdDSgeT8-yL45AVQu-9EyYWqGxjCNjqPZing27cmWboo1qWURfVf&m=lfPv-6yBDkcHt5izF4aF42U7hyOXDtg5LQN0tccc7nk&s=J_3D0WoVH4l-U_8_o8henxWPyrUhaqxT6q6whPZNAmQ&e=> .