Azure Application Insight (2) Azure Function 设置Application Insight

　　《Windows Azure Platform 系列文章目录》

　　本文介绍的是由世纪互联运维的Azure China。

　　目前Azure China是要通过代码来配置Application Insight监控的，本文会详细介绍相关的内容。

　　1.首先，我们先创建1个新的资源组

　　2.然后在这个资源组里，创建新的Azure Function。如下图：

　　3.创建这个Function的时候，还会默认创建Application Insight。如下图：

　　4.创建完毕后，资源如下：

　　5.我们选择上面已经创建的Azure Function，打开Application Insight功能

　　选择完毕后，点击Apply生效。

　　6.然后我们在本地PC，创建1个Azure Function项目：

　　7.新建一个Function，类型为Http Trigger

　　8.在项目目录中，增加starup.cs类。如下图：

　　9.startup.cs代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.ApplicationInsights.Extensibility.Implementation.ApplicationId;
using Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse;
using Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;

[assembly: FunctionsStartup(typeof(FunctionApp1.Startup))]


namespace FunctionApp1
{
    internal class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            var quickPulseFactory = builder.Services.FirstOrDefault(sd => sd.ServiceType == typeof(ITelemetryModule) &&
            sd.ImplementationType == typeof(QuickPulseTelemetryModule));
            if (quickPulseFactory != null)
            {
                builder.Services.Remove(quickPulseFactory);
            }

            var appIdFactory = builder.Services.FirstOrDefault(sd => sd.ServiceType == typeof(IApplicationIdProvider));
            if (appIdFactory != null)
            {
                builder.Services.Remove(appIdFactory);
            }

            var channelFactory = builder.Services.FirstOrDefault(sd => sd.ServiceType == typeof(ITelemetryChannel));
            if (channelFactory != null)
            {
                builder.Services.Remove(channelFactory);
            }

            builder.Services.AddSingleton<ITelemetryModule, QuickPulseTelemetryModule>(_ =>
            new QuickPulseTelemetryModule
            {
                QuickPulseServiceEndpoint = "https://live.applicationinsights.azure.cn/QuickPulseService.svc"
            });

            builder.Services.AddSingleton<IApplicationIdProvider, ApplicationInsightsApplicationIdProvider>(_ => new ApplicationInsightsApplicationIdProvider() { ProfileQueryEndpoint = "https://dc.applicationinsights.azure.cn/api/profiles/{0}/appId" });

            builder.Services.AddSingleton<Microsoft.ApplicationInsights.Channel.ITelemetryChannel>(_ => new ServerTelemetryChannel() { EndpointAddress = "https://dc.applicationinsights.azure.cn/v2/track" });
        }
    }

}

　　10.在项目中，增加对下面依赖性的引用：

　　11.在项目根目录中，增加文件：appsettings.json

{
  "ApplicationInsights": {
    "InstrumentationKey": "[Application Insight的秘钥]"
  },
  "Logging": {
    "LogLevel": {
      "Default": "None"
    }
  }
}

　　12.上面的Application Insight的秘钥，我们可以通过查看Application Insight的访问秘钥：　　

　　页面跳转：

　　把上面的Instrumentation Key，粘贴到步骤11的配置项里。

　　13.在Visual Studio项目中，修改Function1.cs的代码：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.Extensibility;

namespace FunctionApp1
{
    
    public static class Function1
    {
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {        
            string name = req.Query["name"];

            //增加的代码
            var telemetry = new TelemetryClient();
            telemetry.TrackTrace("Request " + name);
            //代码结束

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = name ?? data?.name;

            string responseMessage = string.IsNullOrEmpty(name)
                ? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
                : $"Hello, {name}. This HTTP triggered function executed successfully.";

            //增加的代码
            telemetry.TrackTrace("Execute finished");
            //代码结束

            return new OkObjectResult(responseMessage);
        }
    }
}