Implement #73 integration tests for .NET (#83)

* Implement #73 integration tests for .NET

This adds .NET auto attachment tests

* make sure we get the logs for dotnet-test-app not java-test-app

* ensure app logs at trace level

* enable stdout logging

* ensure we use /elastic/apm/ as mount path

* update agent_has_started grep for agent presence

* :grep => grep, trying out fleet but its VI bindings are still crap :)

* more info from agent_has_started.sh

* simpler grep

.github/workflows/integration.yml

@@ -20,11 +20,8 @@ on:
       - '**.asciidoc'
 
 env:
-  AGENT_TESTS: java nodejs
-
-permissions:
-  contents: read
-
+  AGENT_TESTS: dotnet java nodejs
+
 jobs:
   integration-test:
     runs-on: ubuntu-latest

.gitignore

@@ -3,6 +3,7 @@ main
 
 .webhook
 .vscode
+.idea
 bin
 
-html_docs
+html_docs

charts/apm-attacher/values.yaml

@@ -41,6 +41,6 @@ webhookConfig:
       environment:
         CORECLR_ENABLE_PROFILING: "1"
         CORECLR_PROFILER: "{FA65FE15-F085-4681-9B20-95E04F6C03CC}"
-        CORECLR_PROFILER_PATH: "/usr/agent/apm-dotnet-agent/libelastic_apm_profiler.so"
-        ELASTIC_APM_PROFILER_HOME: "/usr/agent/apm-dotnet-agent"
-        ELASTIC_APM_PROFILER_INTEGRATIONS: "/usr/agent/apm-dotnet-agent/integrations.yml"
+        CORECLR_PROFILER_PATH: "/elastic/apm/agent/apm-dotnet-agent/libelastic_apm_profiler.so"
+        ELASTIC_APM_PROFILER_HOME: "/elastic/apm/agent/apm-dotnet-agent"
+        ELASTIC_APM_PROFILER_INTEGRATIONS: "/elastic/apm/agent/apm-dotnet-agent/integrations.yml"

test/dotnet/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

test/dotnet/Dockerfile

@@ -0,0 +1,19 @@
+# https://hub.docker.com/_/microsoft-dotnet
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /source
+
+# copy csproj and restore as distinct layers
+COPY *.csproj .
+RUN dotnet restore
+
+# copy everything else and build app
+COPY . .
+RUN dotnet publish -c release -o /app --no-restore
+
+# final stage/image
+FROM mcr.microsoft.com/dotnet/aspnet:8.0
+WORKDIR /app
+COPY --from=build /app ./
+ENV ELASTIC_APM_PROFILER_LOG_TARGETS=stdout;file
+ENV ELASTIC_APM_PROFILER_LOG=trace
+ENTRYPOINT ["dotnet", "dotnetapp.dll"]

test/dotnet/Program.cs

@@ -0,0 +1,7 @@
+var builder = WebApplication.CreateBuilder(args);
+_ = builder.Logging.SetMinimumLevel(LogLevel.Trace);
+var app = builder.Build();
+
+app.MapGet("/", () => "Hello World!");
+
+app.Run();

test/dotnet/agent_has_started.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+#initial 10 second delay for restricted CPUs making agent slow starting 
+sleep 10
+START_MESSAGE=`kubectl logs dotnet-test-app | grep 'Elastic APM .NET Agent, version'`
+if [ "x$START_MESSAGE" = "x" ]
+then
+  echo "APM Agent appears to have not been started"
+  exit 1
+else
+  echo "Found APM agent in the kubctl logs"
+  exit 0
+fi

test/dotnet/dotnetapp.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

test/dotnet/test-app.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dotnet-test-app
+  annotations:
+    co.elastic.apm/attach: dotnet
+  labels:
+    app: dotnet-test-app
+spec:
+  containers:
+    - image: localhost:5001/registry/dotnet-test-app
+      imagePullPolicy: Always
+      name: dotnet-test-app

test/mock/test_values.yaml

@@ -17,3 +17,8 @@ webhookConfig:
         ELASTIC_APM_SERVER_URL: "http://mock-apm-server-service:8027"
         ELASTIC_APM_ENVIRONMENT: "test"
         ELASTIC_APM_LOG_LEVEL: "trace"
+    dotnet:
+      environment:
+        ELASTIC_APM_SERVER_URL: "http://mock-apm-server-service:8027"
+        ELASTIC_APM_ENVIRONMENT: "test"
+        ELASTIC_APM_LOG_LEVEL: "trace"