How to debug “built” production NodeJS

问题

I am using Visual Studio code to debug a node application in production environment

The Node process runs inside docker,

I port-forwarded and signaled USR1 to enable attaching debugger from VS code to that node process

My VS Code configuration is like this

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "attach",
      "name": "Debug: service",
      "sourceMaps": true,
      "smartStep": true,
      "remoteRoot": "/src/",
      "localRoot": "/home/my-username/work/orders/src/",
      "protocol": "inspector",
      "port": 9229,
      "restart": true,
      "address": "0.0.0.0",
      "skipFiles": [
        "<node_internals>/**",
        "<node_modules>/**"
      ]
    }
  ]
}

From VS code, I can hook into the application and the application can break on exception However there is no source-mapping which cause all my breakpoint in my source-code to be "unbound breakpoint"

The loaded script list in VS code show that

The VS code debugger is able to see the node_modules and the built version of my source code inside dist. One other notable point is that the source code that is used to build the /dist is also available directly in the production server, in the upper folder.

How can I debug the built production process, using my unbuilt source code in this case?

I added Chrome behaviour as separate question

NodeJs: Chrome inspector can map source but unable to debug on original source

回答1:

I don't know whether it will be helpful to you or not. But I think you have to use node-inspector. It can be used from any browser supporting WebSocket. It is really good.

Cool stuff

Node Inspector uses WebSockets, so no polling for breaks.
Remote debugging and debugging remote machine.
Live edit of running code, optionally persisting changes back to the file-system.
Set breakpoints in files that are not loaded into V8 yet - useful for debugging module loading/initialization.
Embeddable in other applications - see Embedding HOWTO for more details.

回答2:

Node already ships with an integrated debugger. However, it doesn’t have a GUI, so you need to use the command line version.

You can launch this debugger using node debug.

$node debug test.js
< Debugger listening on port 5858
debug> . ok
break in test.js:1
> 1 var a= 5;
  2 a = a*a
  3 a += 2;
debug>

It shows you where it’s paused and then lets you control execution with commands like next and cont.

debug> next
break in test.js:2
  1 var a= 5;
> 2 a = a*a
  3 a += 2;
  4

The repl and watch commands allow you to see the values of local variables.

来源：https://stackoverflow.com/questions/65119801/how-to-debug-built-production-nodejs

标签

node.js

debugging

visual-studio-code

remote-debugging

vscode-debugger