128 lines
4.3 KiB
C#
128 lines
4.3 KiB
C#
// <copyright file="PrometheusExporterHttpServerTests.cs" company="OpenTelemetry Authors">
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// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.Metrics;
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using System.Net;
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using System.Net.Http;
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using System.Threading.Tasks;
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using OpenTelemetry.Metrics;
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using OpenTelemetry.Tests;
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using Xunit;
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namespace OpenTelemetry.Exporter.Prometheus.Tests
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{
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public class PrometheusExporterHttpServerTests
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{
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[Fact]
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public async Task PrometheusExporterHttpServerIntegration()
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{
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Random random = new Random();
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int port = 0;
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int retryCount = 5;
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MeterProvider provider;
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string address = null;
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using var meter = new Meter(Utils.GetCurrentMethodName());
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while (true)
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{
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try
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{
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port = random.Next(2000, 5000);
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provider = Sdk.CreateMeterProviderBuilder()
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.AddMeter(meter.Name)
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.AddPrometheusExporter(o =>
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{
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#if NET461
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bool expectedDefaultState = true;
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#else
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bool expectedDefaultState = false;
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#endif
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if (o.StartHttpListener != expectedDefaultState)
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{
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throw new InvalidOperationException("StartHttpListener value is unexpected.");
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}
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if (!o.StartHttpListener)
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{
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o.StartHttpListener = true;
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}
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address = $"http://localhost:{port}/";
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o.HttpListenerPrefixes = new string[] { address };
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})
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.Build();
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break;
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}
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catch (Exception ex)
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{
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if (ex.Message != PrometheusExporter.HttpListenerStartFailureExceptionMessage)
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{
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throw;
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}
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if (retryCount-- <= 0)
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{
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throw new InvalidOperationException("HttpListener could not be started.");
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}
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}
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}
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var tags = new KeyValuePair<string, object>[]
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{
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new KeyValuePair<string, object>("key1", "value1"),
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new KeyValuePair<string, object>("key2", "value2"),
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};
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var beginTimestamp = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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var counter = meter.CreateCounter<double>("counter_double");
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counter.Add(100.18D, tags);
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counter.Add(0.99D, tags);
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using HttpClient client = new HttpClient();
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using var response = await client.GetAsync($"{address}metrics").ConfigureAwait(false);
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var endTimestamp = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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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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string[] lines = content.Split('\n');
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Assert.Equal(
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$"# TYPE counter_double counter",
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lines[0]);
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Assert.Contains(
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$"counter_double{{key1=\"value1\",key2=\"value2\"}} 101.17",
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lines[1]);
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var index = content.LastIndexOf(' ');
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Assert.Equal('\n', content[content.Length - 1]);
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var timestamp = long.Parse(content.Substring(index, content.Length - index - 1));
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Assert.True(beginTimestamp <= timestamp && timestamp <= endTimestamp);
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}
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}
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}
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