Output doesn't write to --out path in Docker

[thiskevinwang]

Tracking this here in case it's relevant / actionable...

Description

When running the docker container (make docker-run), and making a request, it looks like the "in" file (.mmd) gets written, but the "out" file (.svg) doesn't get written, and the container returns a 500.

Notes

I made a slight modification to the Makefile in order to build the docker image on my M1 Mac.

docker-image:
	docker buildx build --platform linux/amd64 -t ${DOCKER_IMAGE} .

Docker logs

2022/08/04 14:01:53 [500] could not generate diagram: cachingGenerater.generate failed: failed when executing mermaid: exit status 1: Generating single mermaid chart
: 
ProtocolError: Protocol error (Target.createTarget): Target closed.
    at /usr/app/node_modules/puppeteer/lib/cjs/puppeteer/common/Connection.js:103:24
    at new Promise (<anonymous>)
    at Connection.send (/usr/app/node_modules/puppeteer/lib/cjs/puppeteer/common/Connection.js:99:16)
    at Browser._createPageInContext (/usr/app/node_modules/puppeteer/lib/cjs/puppeteer/common/Browser.js:258:91)
    at BrowserContext.newPage (/usr/app/node_modules/puppeteer/lib/cjs/puppeteer/common/Browser.js:622:75)
    at Browser.newPage (/usr/app/node_modules/puppeteer/lib/cjs/puppeteer/common/Browser.js:252:75)
    at /usr/app/node_modules/@mermaid-js/mermaid-cli/index.bundle.js:174:32
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/usr/app/node_modules/@mermaid-js/mermaid-cli/index.bundle.js:18:103)
    at _next (/usr/app/node_modules/@mermaid-js/mermaid-cli/index.bundle.js:20:194)

This puppeteer/puppeteer#1947 issue seems to be related

[TomWright]

Thanks for raising this - does this only happen for a small percentage of requests or is it all of them?
Does it seem more prevalent under certain conditions? I'm having trouble replicating it locally

[thiskevinwang]

For me, it seems to be 100% of requests, when running in Docker

curl --location --request POST 'http://localhost:8080/generate' \
--header 'Content-Type: text/plain' \
--data-raw 'graph LR
    A-->B
    B-->C
    C-->D
    C-->F'

(Copied from Postman)

---

If I run the project with go, it just works

go run cmd/app/main.go --mermaid=./mermaidcli/node_modules/.bin/mmdc --in=./tmp --out=./tmp

[TomWright]

Ah OK thanks for that, it will help me figure out what's going on.

Going off of the linked issue I expected it's a misconfiguration of puppeteer in the docker image.