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Added integration test for PrometheusExporterMiddleware. (#2456)
Co-authored-by: Cijo Thomas <cithomas@microsoft.com>
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test/OpenTelemetry.Exporter.Prometheus.Tests/PrometheusExporterMiddlewareTests.cs
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| // <copyright file="PrometheusExporterMiddlewareTests.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> | ||
|
|
||
| #if !NET461 | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics.Metrics; | ||
| using System.Net; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.AspNetCore.Builder; | ||
| using Microsoft.AspNetCore.Hosting; | ||
| using Microsoft.AspNetCore.TestHost; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.Hosting; | ||
| using OpenTelemetry.Metrics; | ||
| using Xunit; | ||
|
|
||
| namespace OpenTelemetry.Exporter.Prometheus.Tests | ||
| { | ||
| public sealed class PrometheusExporterMiddlewareTests | ||
| { | ||
| private const string MeterName = "PrometheusExporterMiddlewareTests.Meter"; | ||
|
|
||
| [Fact] | ||
| public async Task PrometheusExporterMiddlewareIntegration() | ||
| { | ||
| var host = await new HostBuilder() | ||
| .ConfigureWebHost(webBuilder => webBuilder | ||
| .UseTestServer() | ||
| .UseStartup<Startup>()) | ||
| .StartAsync(); | ||
|
|
||
| var tags = new KeyValuePair<string, object>[] | ||
| { | ||
| new KeyValuePair<string, object>("key1", "value1"), | ||
| new KeyValuePair<string, object>("key2", "value2"), | ||
| }; | ||
|
|
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| using var meter = new Meter(MeterName, "0.0.1"); | ||
|
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| var counter = meter.CreateCounter<double>("counter_double"); | ||
| counter.Add(100.18D, tags); | ||
| counter.Add(0.99D, tags); | ||
|
|
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| using var response = await host.GetTestClient().GetAsync("/metrics"); | ||
|
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| Assert.Equal(HttpStatusCode.OK, response.StatusCode); | ||
|
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| string content = await response.Content.ReadAsStringAsync().ConfigureAwait(false); | ||
|
|
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| Assert.Equal( | ||
| $"# TYPE counter_double counter\ncounter_double{{key1=\"value1\",key2=\"value2\"}} 101.17 1633041000000\n", | ||
| content); | ||
|
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| await host.StopAsync().ConfigureAwait(false); | ||
| } | ||
|
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| public class Startup | ||
| { | ||
| public void ConfigureServices(IServiceCollection services) | ||
| { | ||
| services.AddOpenTelemetryMetrics(builder => builder | ||
| .AddMeter(MeterName) | ||
| .AddPrometheusExporter(o => | ||
| { | ||
| o.GetUtcNowDateTimeOffset = () => new DateTimeOffset(2021, 9, 30, 22, 30, 0, TimeSpan.Zero); | ||
| if (o.StartHttpListener) | ||
| { | ||
| throw new InvalidOperationException("StartHttpListener should be false on .NET Core 3.1+."); | ||
| } | ||
| })); | ||
| } | ||
|
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| public void Configure(IApplicationBuilder app) | ||
| { | ||
| app.UseOpenTelemetryPrometheusScrapingEndpoint(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| #endif |