88 lines
3.4 KiB
C#
88 lines
3.4 KiB
C#
// <copyright file="WeatherForecastController.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>
|
|
|
|
namespace Examples.AspNetCore.Controllers;
|
|
|
|
using System.Diagnostics;
|
|
using System.Diagnostics.Metrics;
|
|
using Examples.AspNetCore;
|
|
using Microsoft.AspNetCore.Mvc;
|
|
|
|
[ApiController]
|
|
[Route("[controller]")]
|
|
public class WeatherForecastController : ControllerBase
|
|
{
|
|
private static readonly string[] Summaries = new[]
|
|
{
|
|
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching",
|
|
};
|
|
|
|
private static readonly HttpClient HttpClient = new();
|
|
|
|
private readonly ILogger<WeatherForecastController> logger;
|
|
private readonly ActivitySource activitySource;
|
|
private readonly Counter<long> freezingDaysCounter;
|
|
|
|
public WeatherForecastController(ILogger<WeatherForecastController> logger, Instrumentation instrumentation)
|
|
{
|
|
this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
|
|
|
|
ArgumentNullException.ThrowIfNull(instrumentation);
|
|
this.activitySource = instrumentation.ActivitySource;
|
|
this.freezingDaysCounter = instrumentation.FreezingDaysCounter;
|
|
}
|
|
|
|
[HttpGet]
|
|
public IEnumerable<WeatherForecast> Get()
|
|
{
|
|
using var scope = this.logger.BeginScope("{Id}", Guid.NewGuid().ToString("N"));
|
|
|
|
// Making an http call here to serve as an example of
|
|
// how dependency calls will be captured and treated
|
|
// automatically as child of incoming request.
|
|
var res = HttpClient.GetStringAsync("http://google.com").Result;
|
|
|
|
// Optional: Manually create an activity. This will become a child of
|
|
// the activity created from the instrumentation library for AspNetCore.
|
|
// Manually created activities are useful when there is a desire to track
|
|
// a specific subset of the request. In this example one could imagine
|
|
// that calculating the forecast is an expensive operation and therefore
|
|
// something to be distinguished from the overall request.
|
|
// Note: Tags can be added to the current activity without the need for
|
|
// a manual activity using Acitivty.Current?.SetTag()
|
|
using var activity = this.activitySource.StartActivity("calculate forecast");
|
|
|
|
var rng = new Random();
|
|
var forecast = Enumerable.Range(1, 5).Select(index => new WeatherForecast
|
|
{
|
|
Date = DateTime.Now.AddDays(index),
|
|
TemperatureC = rng.Next(-20, 55),
|
|
Summary = Summaries[rng.Next(Summaries.Length)],
|
|
})
|
|
.ToArray();
|
|
|
|
// Optional: Count the freezing days
|
|
this.freezingDaysCounter.Add(forecast.Count(f => f.TemperatureC < 0));
|
|
|
|
this.logger.LogInformation(
|
|
"WeatherForecasts generated {count}: {forecasts}",
|
|
forecast.Length,
|
|
forecast);
|
|
|
|
return forecast;
|
|
}
|
|
}
|