Critical Error: cannot process multiple files at once

[Zirafnik]

Because transforming PDFs into PNGs (and then further PNG processing) is computationally expensive I do it inside Node.js worker_threads, so they do not block the main thread execution.

When I try launching two threads, each processing its own PDF file the following error is thrown, which kills the thread process:

Error: Module did not self-register: '/home/user/backend/node_modules/canvas/build/Release/canvas.node'.
    at Object..node (node:internal/modules/cjs/loader:1586:18)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Function._load (node:internal/modules/cjs/loader:1104:12)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at Object.<anonymous> (/home/user/backend/node_modules/canvas/lib/bindings.js:3:18)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Object..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Function._load (node:internal/modules/cjs/loader:1104:12)

Note: rm -r node_modules then npm install did not resolve the issue

Update: I found out that the issue lies with the canvas dependency, which still does not support worker_threads: Automattic/node-canvas#1394

[Zirafnik]

@GreenFlag31 Yeah, I know. You should checkout the original "node-canvas" issue.

Also, your library adds no new functionality and is just a fork of this one?

[dichovsky]

Because transforming PDFs into PNGs (and then further PNG processing) is computationally expensive I do it inside Node.js worker_threads, so they do not block the main thread execution.

When I try launching two threads, each processing its own PDF file the following error is thrown, which kills the thread process:

Error: Module did not self-register: '/home/user/backend/node_modules/canvas/build/Release/canvas.node'.
    at Object..node (node:internal/modules/cjs/loader:1586:18)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Function._load (node:internal/modules/cjs/loader:1104:12)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at Object.<anonymous> (/home/user/backend/node_modules/canvas/lib/bindings.js:3:18)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Object..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Function._load (node:internal/modules/cjs/loader:1104:12)

Note: rm -r node_modules then npm install did not resolve the issue

Update: I found out that the issue lies with the canvas dependency, which still does not support worker_threads: Automattic/node-canvas#1394

Currently "node-canvas" replaced with "@napi-rs/canvas". Please try v3.6.3

[Zirafnik]

Hi, thanks for the update.

Replacing a key dependency feels scary, however, I trust you did extensive testing with the replacement. I only did a quick, surface-level research, but @napi-rs/canvas seems like a perfect drop-in replacement.

I found some worrying old issues, like missing support for some popular fonts, which I do not know if they are relevant to this library, or have perhaps even already been fixed.

I will upgrade and report back my findings, once I have more time.