54 lines
1.7 KiB
C#
54 lines
1.7 KiB
C#
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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using System.Diagnostics;
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using System.Diagnostics.Metrics;
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using Microsoft.Data.SqlClient;
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// .NET Diagnostics: create the span factory
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using var activitySource = new ActivitySource("Examples.Service");
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// .NET Diagnostics: create a metric
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using var meter = new Meter("Examples.Service", "1.0");
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var successCounter = meter.CreateCounter<long>("srv.successes.count", description: "Number of successful responses");
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var builder = WebApplication.CreateBuilder(args);
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var app = builder.Build();
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var connectionString = System.Environment.GetEnvironmentVariable("DB_CONNECTION");
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app.MapGet("/", Handler);
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app.Run();
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async Task<string> Handler(ILogger<Program> logger)
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{
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await ExecuteSql("SELECT 1");
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// .NET Diagnostics: create a manual span
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using (var activity = activitySource.StartActivity("SayHello"))
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{
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activity?.SetTag("foo", 1);
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activity?.SetTag("bar", "Hello, World!");
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activity?.SetTag("baz", new int[] { 1, 2, 3 });
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var waitTime = Random.Shared.NextDouble(); // max 1 seconds
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await Task.Delay(TimeSpan.FromSeconds(waitTime));
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activity?.SetStatus(ActivityStatusCode.Ok);
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// .NET Diagnostics: update the metric
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successCounter.Add(1);
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}
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// .NET ILogger: create a log
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logger.LogInformation("Success! Today is: {Date:MMMM dd, yyyy}", DateTimeOffset.UtcNow);
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return "Hello there";
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}
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async Task ExecuteSql(string sql)
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{
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using var connection = new SqlConnection(connectionString);
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await connection.OpenAsync();
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using var command = new SqlCommand(sql, connection);
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using var reader = await command.ExecuteReaderAsync();
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}
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