Add OTLP exporter integration test

.github/workflows/integration.yml

@@ -43,3 +43,14 @@ jobs:
       - uses: actions/checkout@v2
       - name: Run W3C Trace Context docker-compose.integration
         run: docker-compose --file=test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/docker-compose.yml --file=build/docker-compose.${{ matrix.version }}.yml --project-directory=. up --exit-code-from=tests --build
+
+  otlp-exporter-test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        version: [netcoreapp2.1,netcoreapp3.1]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run OTLP Exporter docker-compose.integration
+        run: docker-compose --file=test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/docker-compose.yml --file=build/docker-compose.${{ matrix.version }}.yml --project-directory=. up --exit-code-from=tests --build

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/DelegatingTestExporter.cs

@@ -0,0 +1,43 @@
+// <copyright file="DelegatingTestExporter.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests
+{
+    public class DelegatingTestExporter<T> : BaseExporter<T>
+        where T : class
+    {
+        public List<ExportResult> ExportResults = new List<ExportResult>();
+
+        private readonly BaseExporter<T> exporter;
+
+        public DelegatingTestExporter(BaseExporter<T> exporter)
+        {
+            this.exporter = exporter;
+        }
+
+        public override ExportResult Export(in Batch<T> batch)
+        {
+            var result = this.exporter.Export(batch);
+            this.ExportResults.Add(result);
+            return result;
+        }
+    }
+}

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/Dockerfile

@@ -0,0 +1,17 @@
+# Create a container for running the OpenTelemetry Collector integration tests.
+# This should be run from the root of the repo:
+# docker build --file test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/Dockerfile
+
+ARG SDK_VERSION=3.1
+FROM mcr.microsoft.com/dotnet/core/sdk:${SDK_VERSION} AS build
+ARG PUBLISH_CONFIGURATION=Release
+ARG PUBLISH_FRAMEWORK=netcoreapp3.1
+WORKDIR /repo
+COPY . ./
+WORKDIR "/repo/test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests"
+RUN dotnet publish "OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests.csproj" -c "${PUBLISH_CONFIGURATION}" -f "${PUBLISH_FRAMEWORK}" -o /drop -p:IntegrationBuild=true -p:TARGET_FRAMEWORK=${PUBLISH_FRAMEWORK}
+
+FROM mcr.microsoft.com/dotnet/core/sdk:${SDK_VERSION} AS final
+WORKDIR /test
+COPY --from=build /drop .
+ENTRYPOINT ["dotnet", "vstest", "OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests.dll"]

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/IntegrationTests.cs

@@ -0,0 +1,58 @@
+// <copyright file="IntegrationTests.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System.Diagnostics;
+using OpenTelemetry.Tests;
+using OpenTelemetry.Trace;
+using Xunit;
+
+namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests
+{
+    public class IntegrationTests
+    {
+        private const string CollectorEndpointEnvVarName = "OTEL_EXPORTER_OTLP_ENDPOINT";
+        private static readonly string CollectorEndpoint = SkipUnlessEnvVarFoundFactAttribute.GetEnvironmentVariable(CollectorEndpointEnvVarName);
+
+        [Trait("CategoryName", "CollectorIntegrationTests")]
+        [SkipUnlessEnvVarFoundFact(CollectorEndpointEnvVarName)]
+        public void ExportResultIsSuccess()
+        {
+            var exporterOptions = new OtlpExporterOptions
+            {
+                Endpoint = CollectorEndpoint,
+            };
+
+            var otlpExporter = new OtlpExporter(exporterOptions);
+            var delegatingExporter = new DelegatingTestExporter<Activity>(otlpExporter);
+            var exportActivityProcessor = new SimpleExportProcessor<Activity>(delegatingExporter);
+
+            var activitySourceName = "otlp.collector.test";
+
+            var builder = Sdk.CreateTracerProviderBuilder()
+                .AddSource(activitySourceName)
+                .AddProcessor(exportActivityProcessor);
+
+            using var tracerProvider = builder.Build();
+
+            var source = new ActivitySource(activitySourceName);
+            var activity = source.StartActivity("Test Activity");
+            activity?.Stop();
+
+            Assert.Single(delegatingExporter.ExportResults);
+            Assert.Equal(ExportResult.Success, delegatingExporter.ExportResults[0]);
+        }
+    }
+}

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests.csproj

@@ -23,6 +23,7 @@
   <ItemGroup>
     <Compile Include="$(RepoRoot)\src\OpenTelemetry\Internal\DateTimeOffsetExtensions.net452.cs" Link="Includes\DateTimeOffsetExtensions.net452.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\EventSourceTestHelper.cs" Link="Includes\EventSourceTestHelper.cs" />
+    <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\SkipUnlessEnvVarFoundFactAttribute.cs" Link="Includes\SkipUnlessEnvVarFoundFactAttribute.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\TestActivityProcessor.cs" Link="Includes\TestActivityProcessor.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\TestEventListener.cs" Link="Includes\TestEventListener.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\TestExporter.cs" Link="Includes\TestExporter.cs" />

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/config.yaml

@@ -0,0 +1,20 @@
+# This is a configuration file for the OpenTelemetry Collector intended to be
+# used in conjunction with the OTLP Exporter integration tests.
+#
+# For more information about the OpenTelemetry Collector see:
+#   https://github.com/open-telemetry/opentelemetry-collector
+#
+receivers:
+  otlp:
+    protocols:
+      grpc:
+
+exporters:
+  logging:
+    loglevel: debug
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      exporters: [logging]

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/docker-compose.yml

@@ -0,0 +1,24 @@
+# Starts an OpenTelemetry Collector and then runs the OTLP exporter integration tests.
+# This should be run from the root of the repo:
+#    docker-compose --file=test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/docker-compose.yml --project-directory=. up --exit-code-from=tests --build
+
+version: '3.7'
+
+services:
+  otel-collector:
+    image: otel/opentelemetry-collector
+    volumes:
+      - ./test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests:/cfg
+    command: --config=/cfg/config.yaml
+    ports:
+      - "55680:55680"
+
+  tests:
+    build:
+      context: .
+      dockerfile: ./test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/Dockerfile
+    command: --TestCaseFilter:CategoryName=CollectorIntegrationTests
+    environment:
+      - OTEL_EXPORTER_OTLP_ENDPOINT=otel-collector:55680
+    depends_on:
+      - otel-collector

test/OpenTelemetry.Tests/Shared/SkipUnlessEnvVarFoundFactAttribute.cs

@@ -0,0 +1,44 @@
+// <copyright file="SkipUnlessEnvVarFoundFactAttribute.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System;
+using Xunit;
+
+namespace OpenTelemetry.Tests
+{
+    internal class SkipUnlessEnvVarFoundFactAttribute : FactAttribute
+    {
+        public SkipUnlessEnvVarFoundFactAttribute(string environmentVariable)
+        {
+            if (string.IsNullOrEmpty(GetEnvironmentVariable(environmentVariable)))
+            {
+                this.Skip = $"Skipped because {environmentVariable} environment variable was not configured.";
+            }
+        }
+
+        public static string GetEnvironmentVariable(string environmentVariableName)
+        {
+            string environmentVariableValue = Environment.GetEnvironmentVariable(environmentVariableName, EnvironmentVariableTarget.Process);
+
+            if (string.IsNullOrEmpty(environmentVariableValue))
+            {
+                environmentVariableValue = Environment.GetEnvironmentVariable(environmentVariableName, EnvironmentVariableTarget.Machine);
+            }
+
+            return environmentVariableValue;
+        }
+    }
+}