在 azure 上看不到信号器服务器应用程序的日志

Question

我已经在 azure 门户上部署了 signalrserver。它接收并发送回针对连接的客户端的消息。问题是我没有看到

ILogger

的任何日志。可能是什么原因？请注意，我启用了日志

App Service log

。

我正在查看 Azure 门户的

Log stream

部分，但没有显示我的

ILogger _logger

消息，我也通过 cli 检查过：

az webapp log tail --name MySignalRApp1 --resource-group MyResourceGroup   

另请注意，除了

Console.Writeline

之外，我还尝试过基本的

ILogger

，而且它也不会在 azure 上打印任何日志。

我错过了什么？

程序.cs：

using Microsoft.Extensions.Logging;
using Microsoft.ApplicationInsights.Extensibility;

var builder = WebApplication.CreateBuilder(args);

builder.Logging.ClearProviders();
builder.Services.AddLogging();


builder.Services.AddApplicationInsightsTelemetry(options =>
{
    options.ConnectionString = builder.Configuration["ApplicationInsights:ConnectionString"];
});

builder.Logging.AddConsole();  
builder.Logging.AddApplicationInsights();  

builder.Services.AddSignalR().AddAzureSignalR(options =>
{
    options.ConnectionString = builder.Configuration["AzureSignalRConnectionString"];
});

var app = builder.Build();
app.UseRouting();
app.UseStaticFiles();
app.MapHub<ChatHub>("/chathub"); 
app.Run();

ChatHub：（缩短）

using System.Collections.Generic;
using System.Diagnostics;
using System.Threading.Tasks;

public class ChatHub : Hub
{
    private readonly ILogger<ChatHub> _logger;

    public ChatHub(ILogger<ChatHub> logger)
    {
        _logger = logger;
    }

    public async Task Connect(string username)
    {
        _logger.LogInformation($"Test_1");
        _logger.LogDebug($"Test_2");
        _logger.LogTrace($"Test_3");
    }
}

Answer 1

我使用下面的代码在 Azure Application Insights 中记录

Ilogger

和

SignalR service

相关日志。

程序.cs：

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSignalR().AddAzureSignalR(
    options =>
    {
        options.ConnectionString = builder.Configuration["AzureSignalRConnectionString"];
    });
builder.Logging.AddApplicationInsights(
        configureTelemetryConfiguration: (config) =>
            config.ConnectionString = builder.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"],
            configureApplicationInsightsLoggerOptions: (options) => { }
    );
var app = builder.Build();

app.UseDefaultFiles();
app.UseRouting();
app.UseStaticFiles();
app.MapHub<ChatSampleHub>("/chat");
app.Run();

您可以在单独的方法中添加 Ilogger 消息。 ChatSampleHub.cs：

public class ChatSampleHub : Hub
{
    private readonly ILogger<ChatSampleHub> _logger;

    public ChatSampleHub(ILogger<ChatSampleHub> logger)
    {
        _logger = logger;
        _logger.LogInformation("Test_1");
        _logger.LogDebug("Test_2");
        _logger.LogTrace("Test_3");
    }

    public Task BroadcastMessage(string name, string message) =>
        Clients.All.SendAsync("broadcastMessage", name, message);

    public Task Echo(string name, string message) =>
        Clients.Client(Context.ConnectionId)
                .SendAsync("echo", name, $"{message} (echo from server)");
}

appsettings.json：

{
  "Logging": {
    "LogLevel": {
      "Default": "Trace",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "AzureSignalRConnectionString": "Endpoint=https://signalR.service.signalr.net;AccessKey=9UF4GqEanyXXXQt1;Version=1.0;",
  "APPLICATIONINSIGHTS_CONNECTION_STRING": "InstrumentationKey=f8acXXXX"
}

控制台日志：

info: Microsoft.Hosting.Lifetime[14]
      Now listening on: https://localhost:7098
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5114
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: C:\Users\uname\Source\Repos\WebApplication3
info: Microsoft.Azure.SignalR.ServiceConnection[20]
      Service connection 3eb723e9-XX225-b93a-507b6eb78b72 connected.
info: Microsoft.Azure.SignalR.ServiceConnection[20]
      Service connection 776f3fab-44XX-a760-c49377e5c382 connected.
info: Microsoft.Azure.SignalR.ServiceConnection[20]
      Service connection 5cab944XX84-4eeb-8ee4-df866b25ae39 connected.
info: Microsoft.Azure.SignalR.ServiceConnection[20]
      Service connection fc56ebda-88e2-465c-99c4-b77f4a6f7dd1 connected.
info: Microsoft.Azure.SignalR.ServiceConnection[20]
      Service connection d87b9b26-da4b-438b-a473-fbffced9782f connected.
info: Microsoft.Azure.SignalR.StrongServiceConnectionContainer[1]
      Hub 'ChatSampleHub' is now connected to '(Primary)https://signalR.service.signalr.net(hub=ChatSampleHub)'.
info: Microsoft.Azure.SignalR.NegotiateHandler[0]
      Use default handshake timeout.
info: ChatSampleHub[0]
      Test_1
info: ChatSampleHub[0]
      Test_1
info: Microsoft.Azure.SignalR.ServiceLifetimeManager[0]
      Start to broadcast message 543904857XX70528.
info: Microsoft.Azure.SignalR.MultiEndpointMessageWriter[11]
      Route message 54390XX0070528 to service endpoint (Primary)https://signalR.service.signalr.net(hub=ChatSampleHub).
info: Microsoft.Azure.SignalR.ServiceLifetimeManager[110]
      Succeeded to send message 543904XX0070528.

应用见解：

• 您可以在

  App Service=>Monitoring=>Application Insights=>Investigate=>Transaction Search

  下查看日志：

您还可以在

Application Insights=>Overview=>Logs

下查看日志：

您可以在本地调试代码并检查是否命中了 Ilogger 代码ChatHub 类中的 Connect 方法。