Mint bug

This repo illustrates two bugs in mint:

1. The originally reported bug in Mint removes Python modules if modules are loaded dynamically #752

2. Another discovered while creating the repo. It results in the following error message when an HTTP request is sent to the container and the Python code in the container tries to return:

info: Function.mint_bug_example[1] Executing 'Functions.mint_bug_example' (Reason='This function was programmatically called via the host APIs.', Id=ec1e6faf-5377-4330-bd81-ebf586bd1003) info: Function.mint_bug_example.User[0] Python HTTP trigger function processed a request. fail: Function.mint_bug_example[3] Executed 'Functions.mint_bug_example' (Failed, Id=ec1e6faf-5377-4330-bd81-ebf586bd1003, Duration=60ms) Microsoft.Azure.WebJobs.Host.FunctionInvocationException: Exception while executing function: Functions.mint_bug_example ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.CSharp, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.

  File name: 'Microsoft.CSharp, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
    at Microsoft.Azure.WebJobs.Script.Grpc.GrpcMessageExtensionUtilities.ConvertFromHttpMessageToExpando(RpcHttp inputMessage)
    at Microsoft.Azure.WebJobs.Script.Grpc.GrpcMessageConversionExtensions.ToObject(TypedData typedData) in /src/azure-functions-host/src/WebJobs.Script.Grpc/MessageExtensions/GrpcMessageConversionExtensions.cs:line 35
    at Microsoft.Azure.WebJobs.Script.Grpc.GrpcWorkerChannel.CreateScriptInvocationResult(InvocationResponse invokeResponse) in /src/azure-functions-host/src/WebJobs.Script.Grpc/Channel/GrpcWorkerChannel.cs:line 1154
    at Microsoft.Azure.WebJobs.Script.Grpc.GrpcWorkerChannel.InvokeResponse(InvocationResponse invokeResponse) in /src/azure-functions-host/src/WebJobs.Script.Grpc/Channel/GrpcWorkerChannel.cs:line 1123
    at Microsoft.Azure.WebJobs.Script.Description.WorkerFunctionInvoker.InvokeCore(Object[] parameters, FunctionInvocationContext context) in /src/azure-functions-host/src/WebJobs.Script/Description/Workers/WorkerFunctionInvoker.cs:line 101

(more after this)

Code

The code is a simple Azure Functions function app that takes an HTTP request /api/mint_bug_example with query parameter name and if the name is not Darth_Vader returns a hello message. If it is Darth_Vader, it uses the Python module importlib to dynamically load the module darth_vader and call the function enter_darth_vader().

Build container, start container, test for Python import bug

The bash script build-mint-bug.sh builds the container mint-bug.

After the container is build, start it with start-container.sh, then run test-mint-python-import-bug.sh to illustrate how it should work.

Then run mint on it like this:

mint build --http-probe --expose 80 mint-bug:latst

Then run the mint container using start-bug-container.sh and run test-mint-python-import-bug.sh again.

The failure to find the dynamically loaded module message will show up.

Test for C# file missing bug

Mint seems to be also removing code necessary for the Azure Functions runtime to return. That's the second bug mentioned above. The user code here is Python, there's no C# but the error message says that Microsoft.CSharp is missing.

The build and start procedure is as before, but this time run test-mint-azure-functions-csharp-bug.shagainst the running container.