Bundle docs_ai_backend

[knazarov]

Short Summary

It looks like it's not very difficult to bundle all necessary npm dependencies together with the docs_ai_backend. What is needed is just to specify output: standalone in the next.js config.

I've tried to start the server with node from the resulting build and it worked. However, I can't do any in-depth testing and will wait for Shukhrat to do that part.

Related Issue

Part of #728

Breaking Changes (if any)

It is possible that I didn't ship everything that is needed in the resulting distribution, so help is needed.

Checklist

Please mark each item with an x inside the brackets (e.g., [x]) once completed.

• I have read and followed the Contributing Guide
• I have tested the changes locally
• I have added relevant tests (if applicable)
• I have updated documentation/comments (if applicable)

[ukorvl]

Let's change "start" script to "node ./path to server.js"?

[ukorvl]

I see that standalone dir still contains some node_modules, that use symlinks. The problem is described in #714
If we copy this to deb it is not going to work since there are symlinks in the node_modules.

[khannanov-nil]

There are two main issues that need to be investigated here. Both of them arise if the suggestion by @ukorvl is applied (i.e., the app is started via next ./node .next/standalone/docs_ai_backend/server.js.

1. The app starts on port 3000 by default but the production machine will expect it at port 8092. Probably the port can be specified when the app is launched directly in the command.

2. Requests to /api/services/db do not work and they are needed to renew the DB. Specific error is:

[TypeError: fetch failed] {
  [cause]: [Error: getaddrinfo EAI_AGAIN undefined] {
    errno: -3001,
    code: 'EAI_AGAIN',
    syscall: 'getaddrinfo',
    hostname: 'undefined'
  }
}

If the app is launched via npm run start, the request works normally.