feat: Parse Azure Function HttpTrigger parameters

[tippmar-nr]

Implements parsing for request method, request uri and response status code for Azure Functions that utilize HttpTrigger.

Includes updated integration tests that exercise an Azure Function app that uses the Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore package and one that does not, to verify that we can correctly parse the data we need in both scenarios.

(Don't be scared by the ridiculously large commit history - this branch started out as a feature work branch back when the Azure Functions feature was still around...)

[chynesNR]

Is this really our best option for getting access to the inputs? Feels a bit clunky.

[tippmar-nr]

This is, unfortunately, exactly what the GRPC-generated code in an Azure function app does between when the InvokeFunctionAsync() method is called and when the actual function Run() method is called. It's ugly, but it's all we have to work with.

        public async global::System.Threading.Tasks.ValueTask ExecuteAsync(global::Microsoft.Azure.Functions.Worker.FunctionContext context)
        {
            var inputBindingFeature = context.Features.Get<global::Microsoft.Azure.Functions.Worker.Context.Features.IFunctionInputBindingFeature>();
            var inputBindingResult = await inputBindingFeature.BindFunctionInputAsync(context);
            var inputArguments = inputBindingResult.Values;

            if (string.Equals(context.FunctionDefinition.EntryPoint, "AzureFunctionApp.Function1.Run", StringComparison.Ordinal))
            {
                var instanceType = types["AzureFunctionApp.Function1"];
                var i = _functionActivator.CreateInstance(instanceType, context) as global::AzureFunctionApp.Function1;
                context.GetInvocationResult().Value = await i.Run((global::Microsoft.Azure.Functions.Worker.Http.HttpRequestData)inputArguments[0]);
            }
            else if (string.Equals(context.FunctionDefinition.EntryPoint, "AzureFunctionApp.Function2.Run", StringComparison.Ordinal))
            {
                var instanceType = types["AzureFunctionApp.Function2"];
                var i = _functionActivator.CreateInstance(instanceType, context) as global::AzureFunctionApp.Function2;
                context.GetInvocationResult().Value = i.Run((global::Microsoft.AspNetCore.Http.HttpRequest)inputArguments[0]);
            }
            else if (string.Equals(context.FunctionDefinition.EntryPoint, "AzureFunctionApp.QueueTriggerFunction.Run", StringComparison.Ordinal))
            {
                var instanceType = types["AzureFunctionApp.QueueTriggerFunction"];
                var i = _functionActivator.CreateInstance(instanceType, context) as global::AzureFunctionApp.QueueTriggerFunction;
                i.Run((string)inputArguments[0]);
            }
        }

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.23%. Comparing base (d55567f) to head (94d4855).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2776      +/-   ##
==========================================
- Coverage   81.24%   81.23%   -0.02%     
==========================================
  Files         460      460              
  Lines       29229    29230       +1     
  Branches     3223     3223              
==========================================
- Hits        23747    23744       -3     
- Misses       4696     4698       +2     
- Partials      786      788       +2     

Flag	Coverage Δ
Agent	82.25% <100.00%> (-0.02%)	⬇️
Profiler	72.12% <ø> (ø)

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Files with missing lines	Coverage Δ
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	80.73% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes