lambda output missing when using invoke inside pm2

[SET001]

This is a Bug Report

Description

For bug reports:

• What went wrong? if you run sls invoke local -f <functionName> inside PM2, you will not see lambda output. You will only see output from webpack rebuild:

PM2           | Change detected on path src/index.ts for app my-service - restarting
PM2           | Stopping app:my-service id:0
PM2           | App [my-service:0] exited with code [0] via signal [SIGINT]
PM2           | pid=81513 msg=process killed
PM2           | App [my-service:0] starting in -fork mode-
PM2           | App [my-service:0] online
0|my-service  | > aws-nodejs-typescript@1.0.0 invoke:hello /home/set/www/cloudbeds/apiTest
0|my-service  | > sls invoke local -f hello
0|my-service  | Serverless: Bundling with Webpack...
0|my-service  | Time: 2171ms
0|my-service  | Built at: 11/22/2018 11:36:50 PM
0|my-service  |            Asset      Size     Chunks             Chunk Names
0|my-service  |       handler.js  1.34 MiB    handler  [emitted]  handler
0|my-service  |   handler.js.map  1.13 MiB    handler  [emitted]  handler
0|my-service  |     src/index.js  1.46 MiB  src/index  [emitted]  src/index
0|my-service  | src/index.js.map  1.26 MiB  src/index  [emitted]  src/index
0|my-service  | Entrypoint handler = handler.js handler.js.map
0|my-service  | Entrypoint src/index = src/index.js src/index.js.map
0|my-service  | [0] multi ./source-map-install.js ./src/index.ts 40 bytes {src/index} [built]
0|my-service  | [./node_modules/buffer-from/index.js] 1.56 KiB {src/index} [built]
0|my-service  | [./node_modules/request-promise-core/configure/request2.js] 1.75 KiB {handler} {src/index} [built]
0|my-service  | [./node_modules/request-promise-native/lib/rp.js] 531 bytes {handler} {src/index} [built]
0|my-service  | [./node_modules/request/index.js] 3.88 KiB {handler} {src/index} [built]
0|my-service  | [./node_modules/source-map-support/source-map-support.js] 17.5 KiB {src/index} [built]
0|my-service  | [./node_modules/source-map/source-map.js] 405 bytes {src/index} [built]
0|my-service  | [./node_modules/stealthy-require/lib/index.js] 2.34 KiB {handler} {src/index} [built]
0|my-service  | [./node_modules/tough-cookie/lib/cookie.js] 38.6 KiB {handler} {src/index} [built]
0|my-service  | [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {handler} {src/index} [built]
0|my-service  | [./source-map-install.js] 41 bytes {src/index} [built]
0|my-service  | [./src/index.ts] 1.03 KiB {handler} {src/index} [built]
0|my-service  | [./src/reservations.ts] 227 bytes {handler} {src/index} [built]
0|my-service  | [fs] external "fs" 42 bytes {handler} {src/index} [built]
0|my-service  | [module] external "module" 42 bytes {src/index} [optional] [built]
0|my-service  |     + 213 hidden modules

• What did you expect should have happened? I expect to see lambda output in PM2 logs like if I were running it without PM2:

set@set-home ~/www/cloudbeds/apiTest $ sls invoke local -f hello
Serverless: Bundling with Webpack...
Time: 2164ms
Built at: 11/22/2018 11:25:09 PM
           Asset      Size     Chunks             Chunk Names
      handler.js  1.34 MiB    handler  [emitted]  handler
  handler.js.map  1.13 MiB    handler  [emitted]  handler
    src/index.js  1.46 MiB  src/index  [emitted]  src/index
src/index.js.map  1.26 MiB  src/index  [emitted]  src/index
Entrypoint handler = handler.js handler.js.map
Entrypoint src/index = src/index.js src/index.js.map
[0] multi ./source-map-install.js ./src/index.ts 40 bytes {src/index} [built]
[./node_modules/buffer-from/index.js] 1.56 KiB {src/index} [built]
[./node_modules/request-promise-core/configure/request2.js] 1.75 KiB {handler} {src/index} [built]
[./node_modules/request-promise-native/lib/rp.js] 531 bytes {handler} {src/index} [built]
[./node_modules/request/index.js] 3.88 KiB {handler} {src/index} [built]
[./node_modules/source-map-support/source-map-support.js] 17.5 KiB {src/index} [built]
[./node_modules/source-map/source-map.js] 405 bytes {src/index} [built]
[./node_modules/stealthy-require/lib/index.js] 2.34 KiB {handler} {src/index} [built]
[./node_modules/tough-cookie/lib/cookie.js] 38.6 KiB {handler} {src/index} [built]
[./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {handler} {src/index} [built]
[./source-map-install.js] 41 bytes {src/index} [built]
[./src/index.ts] 1.03 KiB {handler} {src/index} [built]
[./src/reservations.ts] 227 bytes {handler} {src/index} [built]
[fs] external "fs" 42 bytes {handler} {src/index} [built]
[module] external "module" 42 bytes {src/index} [optional] [built]
    + 213 hidden modules
Serverless: INVOKING INVOKE
{
    "statusCode": 200,
    "body": "{\"message\":\"\\\"ok\\\"\",\"input\":\"\"}"
}

• What was the config you used? PM2 config:

  module.exports = {
  /**
  * Application configuration section
  * http://pm2.keymetrics.io/docs/usage/application-declaration/
  */
  apps: [{
  name: 'my-service',
  script: 'npm',
  watch: true,
  env: {
    COMMON_VARIABLE: 'true'
  },
  env_production: {
    NODE_ENV: 'production'
  },
  args: 'run invoke:hello',
  }],
  };

  package.json scripts section:

  "scripts": {
    "invoke:hello": "sls invoke local -f hello"
  },

• What stacktrace or error message from your provider did you see?

Additional Data

not sure either this is pm2 issue or related to this plugin

• Serverless-Webpack Version you're using: 5.2.0
• Webpack version you're using:4.16.5
• Serverless Framework Version you're using:1.29.2
• Operating System: linux mint
• Stack Trace (if available): no

[SET001]

I'm using pm2 here because sls invoke local -f hello --watch will crash the process on errors and I would have to restart it over and over...

[HyperBrain]

Hi @SET001 . Can you check if both, stderr and stdout are printed properly within PM2? It is quite strange, that the compile output is visible, but the function output is not. As far as I know, they only use standard output mechanisms.