C#•17mo ago

How to start test inside docker container from app?

Hi! I'm thinking of building an app similar to leetcode or codewars. The basic idea is user sends you task id and code and I should run tests on it somewhere. I think doing it in docker containers should work. Is it possible to start docker container and pass there input and then somehow get results? Is there a better solution?

Vernon•8/16/24, 9:49 AM

Maybe you can try to start the container by passing the environment variable and process it?

docker start ... \
    -e VAR_ID="123" \
    -e CODE="Some random code" \
    ...

docker start ... \
    -e VAR_ID="123" \
    -e CODE="Some random code" \
    ...

VVernon Maybe you can try to start the container by passing the environment variable and...

AlexOP•8/16/24, 12:16 PM

thank you, but I don't know how to start it from the app. Should I use ProccessProccess?

Vernon•8/16/24, 12:26 PM

You can simply run the dockerdocker command and store the output into a file based on what kind of output you need.

TeBeCo•8/16/24, 2:12 PM

just run dotnet testdotnet test from inside the container

TeBeCo•8/16/24, 2:12 PM

and it will run the test

TeBeCo•8/16/24, 2:12 PM

docker have nothing to do with anything here

TeBeCo•8/16/24, 2:13 PM

let's re work your question

TeBeCo•8/16/24, 2:14 PM

"how does ... run test ... in dotnet" => dotnet testdotnet test
"where does dotnet testdotnet test comes from" => from the dotnet sdkdotnet sdk
"but what about docker ?" => use a docker image that already have the SDK
"but which one is it ?" => let's check together the official docs on https://learn.microsoft.com/en-us/dotnet/architecture/microservices/net-core-net-framework-containers/official-net-docker-images

TeBeCo•8/16/24, 2:16 PM

TeBeCo•8/16/24, 2:19 PM

now for passing code ...

TeBeCo•8/16/24, 2:19 PM

do not pass code as ENV var

TeBeCo•8/16/24, 2:19 PM

technically you can pass stuff sure

TeBeCo•8/16/24, 2:19 PM

but thing about the general size of code

TeBeCo•8/16/24, 2:19 PM

if you want it at start time, use volume mount

TeBeCo•8/16/24, 2:20 PM

and generally you'll pass one or many files

TeBeCo•8/16/24, 2:21 PM

you'll have to generate either a Context or a csproj + compilation unit from that + dependency BTW

TeBeCo•8/16/24, 2:21 PM

side point / faster

TeBeCo•8/16/24, 2:21 PM

you can spin your container as a WebApi

TeBeCo•8/16/24, 2:21 PM

and accept code as a POST request

TeBeCo•8/16/24, 2:21 PM

and simplify a lot of stuff

TeBeCo•8/16/24, 2:22 PM

and your container would accept / compile / run on that POST

TeBeCo•8/16/24, 2:22 PM

that;s how @MODiX works

MODiX•8/16/24, 2:22 PM

TeBeCo

REPL Result: Success

1 == 2

1 == 2

Result: bool

False

False

Compile: 142.761ms | Execution: 16.556ms | React with ❌ to remove this embed.

TeBeCo•8/16/24, 2:22 PM

https://github.com/discord-csharp/CSharpRepl

GitHub

GitHub - discord-csharp/CSharpRepl: CSharpRepl is a web api for C# ...

CSharpRepl is a web api for C# REPL using the Roslyn Scripting APIs - discord-csharp/CSharpRepl

TTeBeCo https://github.com/discord-csharp/CSharpRepl

AlexOP•8/16/24, 4:28 PM

Thanks for the detailed answer, I'll look into this project.
I don’t yet have a specific plan for how this will work, I’m developing ideas, but the main concept is that I create unit tests in advance for each task (maybe a separate project with tests) and run it somewhere and send back the results to the user

TeBeCo•8/16/24, 5:25 PM

yeah but you'll still need a compilation unit/context

TeBeCo•8/16/24, 5:25 PM

and the user code

TeBeCo•8/16/24, 5:25 PM

question is what triggers it

TeBeCo•8/16/24, 5:26 PM

and are your test agnostics from the user code (sounds like a yes)

TeBeCo•8/16/24, 5:30 PM

if so depending on where you host it or if the user runs it

TeBeCo•8/16/24, 5:31 PM

and if you want faster startup you will either choose to run a fully new container every time which can include a docker pull and take many seconds

TeBeCo•8/16/24, 5:31 PM

or start ahead of time a container and just POST code but you'd pay a fraction of compute / memory hosting on paid plan

AlexOP•8/16/24, 8:49 PM

For now, I will try to make the user wait until the new container starts and check their code

TeBeCo•8/17/24, 10:26 AM

look at the repo i sent above

TeBeCo•8/17/24, 10:27 AM

it's how the discord bot accept restore build execute code and show result

TeBeCo•8/17/24, 10:27 AM

the main difference is that the container is ran ahead of time waiting for a trigger from the backend

TeBeCo•8/17/24, 10:27 AM

that saves you the docker pull + startup time

How to start test inside docker container from app?

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