使用 .NET Core 实现一个自定义日志记录器

news/2025/3/14 8:00:29/文章来源:https://www.cnblogs.com/longshao2024/p/18771386
目录
  • 引言
  • 1. 抽象包
    • 1.1 定义日志记录接口
    • 1.2 定义日志记录抽象类
    • 1.3 表结构迁移
  • 2. EntityFramework Core 的实现
    • 2.1 数据库上下文
    • 2.2 实现日志写入
  • 3. MySqlConnector 的实现
    • 3.1 SQL脚本
    • 3.2 实现日志写入
  • 4. 使用示例

 

引言

在应用程序中，日志记录是一个至关重要的功能。不仅有助于调试和监控应用程序，还能帮助我们了解应用程序的运行状态。
在这个示例中将展示如何实现一个自定义的日志记录器，先说明一下，这个实现和Microsoft.Extensions.Logging、Serilog、NLog什么的无关，这里只是将自定义的日志数据存入数据库中，或许你也可以理解为实现的是一个存数据的“Repository”，只不过用这个Repository来存的是日志🙈。这个实现包含一个抽象包和两个实现包，两个实现分别是用 EntityFramework Core 和 MySqlConnector 。日志记录操作将放在本地队列中异步处理，以确保不影响业务处理。

1. 抽象包

1.1 定义日志记录接口

首先，我们需要定义一个日志记录接口 ICustomLogger，它包含两个方法：LogReceived 和 LogProcessed。LogReceived 用于记录接收到的日志，LogProcessed 用于更新日志的处理状态。

namespace Logging.Abstractions;public interface ICustomLogger
{/// <summary>/// 记录一条日志/// </summary>void LogReceived(CustomLogEntry logEntry);/// <summary>/// 根据Id更新这条日志/// </summary>void LogProcessed(string logId, bool isSuccess);
}

定义一个日志结构实体CustomLogEntry，用于存储日志的详细信息：

namespace Logging.Abstractions;public class CustomLogEntry
{/// <summary>/// 日志唯一Id，数据库主键/// </summary>public string Id { get; set; } = Guid.NewGuid().ToString();public string Message { get; set; } = default!;public bool IsSuccess { get; set; }public DateTime CreateTime { get; set; } = DateTime.UtcNow;public DateTime? UpdateTime { get; set; } = DateTime.UtcNow;
}

1.2 定义日志记录抽象类

接下来，定义一个抽象类CustomLogger，它实现了ICustomLogger接口，并提供了日志记录的基本功能，将日志写入操作（插入or更新）放在本地队列中异步处理。使用ConcurrentQueue来确保线程安全，并开启一个后台任务异步处理这些日志。这个抽象类只负责将日志写入命令放到队列中，实现类负责消费队列中的消息，确定日志应该怎么写？往哪里写？这个示例中后边会有两个实现，一个是基于EntityFramework Core的实现，另一个是MySqlConnector的实现。

封装一下日志写入命令

namespace Logging.Abstractions;public class WriteCommand(WriteCommandType commandType, CustomLogEntry logEntry)
{public WriteCommandType CommandType { get; } = commandType;public CustomLogEntry LogEntry { get; } = logEntry;
}public enum WriteCommandType
{/// <summary>/// 插入/// </summary>Insert,/// <summary>/// 更新/// </summary>Update
}

CustomLogger实现

using System.Collections.Concurrent;
using Microsoft.Extensions.Logging;namespace Logging.Abstractions;public abstract class CustomLogger : ICustomLogger, IDisposable, IAsyncDisposable
{protected ILogger<CustomLogger> Logger { get; }protected ConcurrentQueue<WriteCommand> WriteQueue { get; }protected Task WriteTask { get; }private readonly CancellationTokenSource _cancellationTokenSource;private readonly CancellationToken _cancellationToken;protected CustomLogger(ILogger<CustomLogger> logger){Logger = logger;WriteQueue = new ConcurrentQueue<WriteCommand>();_cancellationTokenSource = new CancellationTokenSource();_cancellationToken = _cancellationTokenSource.Token;WriteTask = Task.Factory.StartNew(TryWriteAsync, _cancellationToken, TaskCreationOptions.LongRunning, TaskScheduler.Default);}public void LogReceived(CustomLogEntry logEntry){WriteQueue.Enqueue(new WriteCommand(WriteCommandType.Insert, logEntry));}public void LogProcessed(string logId, bool isSuccess){var logEntry = GetById(logId);if (logEntry == null){return;}logEntry.IsSuccess = isSuccess;logEntry.UpdateTime = DateTime.UtcNow;WriteQueue.Enqueue(new WriteCommand(WriteCommandType.Update, logEntry));}private async Task TryWriteAsync(){try{while (!_cancellationToken.IsCancellationRequested){if (WriteQueue.IsEmpty){await Task.Delay(1000, _cancellationToken);continue;}if (WriteQueue.TryDequeue(out var writeCommand)){await WriteAsync(writeCommand);}}while (WriteQueue.TryDequeue(out var remainingCommand)){await WriteAsync(remainingCommand);}}catch (OperationCanceledException){// 任务被取消，正常退出}catch (Exception e){Logger.LogError(e, "处理待写入日志队列异常");}}protected abstract CustomLogEntry? GetById(string logId);protected abstract Task WriteAsync(WriteCommand writeCommand);public void Dispose(){Dispose(true);GC.SuppressFinalize(this);}public async ValueTask DisposeAsync(){await DisposeAsyncCore();Dispose(false);GC.SuppressFinalize(this);}protected virtual void Dispose(bool disposing){if (disposing){_cancellationTokenSource.Cancel();try{WriteTask.Wait();}catch (AggregateException ex){foreach (var innerException in ex.InnerExceptions){Logger.LogError(innerException, "释放资源异常");}}finally{_cancellationTokenSource.Dispose();}}}protected virtual async Task DisposeAsyncCore(){_cancellationTokenSource.Cancel();try{await WriteTask;}catch (Exception e){Logger.LogError(e, "释放资源异常");}finally{_cancellationTokenSource.Dispose();}}
}

1.3 表结构迁移

为了方便表结构迁移，我们可以使用FluentMigrator.Runner.MySql，在项目中引入：

<Project Sdk="Microsoft.NET.Sdk"><PropertyGroup><TargetFramework>net8.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable></PropertyGroup><ItemGroup><PackageReference Include="FluentMigrator.Runner.MySql" Version="6.2.0" /></ItemGroup>
</Project>

新建一个CreateLogEntriesTable，放在Migrations目录下

[Migration(20241216)]
public class CreateLogEntriesTable : Migration
{public override void Up(){Create.Table("LogEntries").WithColumn("Id").AsString(36).PrimaryKey().WithColumn("Message").AsCustom(text).WithColumn("IsSuccess").AsBoolean().NotNullable().WithColumn("CreateTime").AsDateTime().NotNullable().WithColumn("UpdateTime").AsDateTime();}public override void Down(){Delete.Table("LogEntries");}
}

添加服务注册

using FluentMigrator.Runner;
using Logging.Abstractions;
using Logging.Abstractions.Migrations;namespace Microsoft.Extensions.DependencyInjection;public static class CustomLoggerExtensions
{/// <summary>/// 添加自定义日志服务表结构迁移/// </summary>/// <param name="services"></param>/// <param name="connectionString">数据库连接字符串</param>/// <returns></returns>public static IServiceCollection AddCustomLoggerMigration(this IServiceCollection services, string connectionString){services.AddFluentMigratorCore().ConfigureRunner(rb => rb.AddMySql5().WithGlobalConnectionString(connectionString).ScanIn(typeof(CreateLogEntriesTable).Assembly).For.Migrations()).AddLogging(lb =>{lb.AddFluentMigratorConsole();});using var serviceProvider = services.BuildServiceProvider();using var scope = serviceProvider.CreateScope();var runner = scope.ServiceProvider.GetRequiredService<IMigrationRunner>();runner.MigrateUp();return services;}
}

2. EntityFramework Core 的实现

2.1 数据库上下文

新建Logging.EntityFrameworkCore项目，添加对Logging.Abstractions项目的引用，并在项目中安装Pomelo.EntityFrameworkCore.MySql和Microsoft.Extensions.ObjectPool。

<Project Sdk="Microsoft.NET.Sdk"><PropertyGroup><TargetFramework>net8.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable></PropertyGroup><ItemGroup><PackageReference Include="Microsoft.Extensions.ObjectPool" Version="8.0.11" /><PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="8.0.2" /></ItemGroup><ItemGroup><ProjectReference Include="..\Logging.Abstractions\Logging.Abstractions.csproj" /></ItemGroup></Project>

创建CustomLoggerDbContext类，用于管理日志实体

using Logging.Abstractions;
using Microsoft.EntityFrameworkCore;namespace Logging.EntityFrameworkCore;public class CustomLoggerDbContext(DbContextOptions<CustomLoggerDbContext> options) : DbContext(options)
{public virtual DbSet<CustomLogEntry> LogEntries { get; set; }
}

使用 ObjectPool 管理 DbContext：提高性能，减少 DbContext 的创建和销毁开销。
创建CustomLoggerDbContextPoolPolicy

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.ObjectPool;namespace Logging.EntityFrameworkCore;/// <summary>
/// DbContext 池策略
/// </summary>
/// <param name="options"></param>
public class CustomLoggerDbContextPoolPolicy(DbContextOptions<CustomLoggerDbContext> options) : IPooledObjectPolicy<CustomLoggerDbContext>
{/// <summary>/// 创建 DbContext/// </summary>/// <returns></returns>public CustomLoggerDbContext Create(){return new CustomLoggerDbContext(options);}/// <summary>/// 回收 DbContext/// </summary>/// <param name="context"></param>/// <returns></returns>public bool Return(CustomLoggerDbContext context){// 重置 DbContext 状态context.ChangeTracker.Clear();return true; }
}

2.2 实现日志写入

创建一个EfCoreCustomLogger，继承自CustomLogger，实现日志写入的具体逻辑

using Logging.Abstractions;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.ObjectPool;namespace Logging.EntityFrameworkCore;/// <summary>
/// EfCore自定义日志记录器
/// </summary>
public class EfCoreCustomLogger(ObjectPool<CustomLoggerDbContext> contextPool, ILogger<EfCoreCustomLogger> logger) : CustomLogger(logger)
{/// <summary>/// 根据Id查询日志/// </summary>/// <param name="logId"></param>/// <returns></returns>protected override CustomLogEntry? GetById(string logId){var dbContext = contextPool.Get();try{return dbContext.LogEntries.Find(logId);}finally{contextPool.Return(dbContext);}}/// <summary>/// 写入日志/// </summary>/// <param name="writeCommand"></param>/// <returns></returns>/// <exception cref="ArgumentOutOfRangeException"></exception>protected override async Task WriteAsync(WriteCommand writeCommand){var dbContext = contextPool.Get();try{switch (writeCommand.CommandType){case WriteCommandType.Insert:if (writeCommand.LogEntry != null){await dbContext.LogEntries.AddAsync(writeCommand.LogEntry);}break;case WriteCommandType.Update:{if (writeCommand.LogEntry != null){dbContext.LogEntries.Update(writeCommand.LogEntry);}break;}default:throw new ArgumentOutOfRangeException();}await dbContext.SaveChangesAsync();}finally{contextPool.Return(dbContext);}}
}

添加服务注册

using Logging.Abstractions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.ObjectPool;namespace Logging.EntityFrameworkCore;public static class EfCoreCustomLoggerExtensions
{public static IServiceCollection AddEfCoreCustomLogger(this IServiceCollection services, string connectionString){if (string.IsNullOrEmpty(connectionString)){throw new ArgumentNullException(nameof(connectionString));}services.AddCustomLoggerMigration(connectionString);services.AddSingleton<ObjectPoolProvider, DefaultObjectPoolProvider>();services.AddSingleton(serviceProvider =>{var options = new DbContextOptionsBuilder<CustomLoggerDbContext>().UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)).Options;var poolProvider = serviceProvider.GetRequiredService<ObjectPoolProvider>();return poolProvider.Create(new CustomLoggerDbContextPoolPolicy(options));});services.AddSingleton<ICustomLogger, EfCoreCustomLogger>();return services;}
}

3. MySqlConnector 的实现

MySqlConnector 的实现比较简单，利用原生SQL操作数据库完成日志的插入和更新。
新建Logging.MySqlConnector项目，添加对Logging.Abstractions项目的引用，并安装MySqlConnector包

<Project Sdk="Microsoft.NET.Sdk"><PropertyGroup><TargetFramework>net8.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable></PropertyGroup><ItemGroup><PackageReference Include="MySqlConnector" Version="2.4.0" /></ItemGroup><ItemGroup><ProjectReference Include="..\Logging.Abstractions\Logging.Abstractions.csproj" /></ItemGroup></Project>

3.1 SQL脚本

为了方便维护，我们把需要用到的SQL脚本放在一个Consts类中

namespace Logging.MySqlConnector;public class Consts
{/// <summary>/// 插入日志/// </summary>public const string InsertSql = """INSERT INTO `LogEntries` (`Id`, `TranceId`, `BizType`, `Body`, `Component`, `MsgType`, `Status`, `CreateTime`, `UpdateTime`, `Remark`)VALUES (@Id, @TranceId, @BizType, @Body, @Component, @MsgType, @Status, @CreateTime, @UpdateTime, @Remark);""";/// <summary>/// 更新日志/// </summary>public const string UpdateSql = """UPDATE `LogEntries` SET `Status` = @Status, `UpdateTime` = @UpdateTimeWHERE `Id` = @Id;""";/// <summary>/// 根据Id查询日志/// </summary>public const string QueryByIdSql = """SELECT `Id`, `TranceId`, `BizType`, `Body`, `Component`, `MsgType`, `Status`, `CreateTime`, `UpdateTime`, `Remark`FROM `LogEntries`WHERE `Id` = @Id;""";
}

3.2 实现日志写入

创建MySqlConnectorCustomLogger类，实现日志写入的具体逻辑

using Logging.Abstractions;


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using Microsoft.Extensions.Logging;
using MySqlConnector;namespace Logging.MySqlConnector;/// <summary>
/// 使用 MySqlConnector 实现记录日志
/// </summary>
public class MySqlConnectorCustomLogger : CustomLogger
{/// <summary>/// 数据库连接字符串/// </summary>private readonly string _connectionString;/// <summary>/// 构造函数/// </summary>/// <param name="connectionString">MySQL连接字符串</param>/// <param name="logger"></param>public MySqlConnectorCustomLogger(string connectionString, ILogger<MySqlConnectorCustomLogger> logger): base(logger){_connectionString = connectionString;}/// <summary> /// 根据Id查询日志/// </summary>/// <param name="logId"></param>/// <returns></returns>protected override CustomLogEntry? GetById(string logId){using var connection = new MySqlConnection(_connectionString);connection.Open();using var command = new MySqlCommand(Consts.QueryByIdSql, connection);command.Parameters.AddWithValue("@Id", logId);using var reader = command.ExecuteReader();if (!reader.Read()){return null;}return new CustomLogEntry{Id = reader.GetString(0),Message = reader.GetString(1),IsSuccess = reader.GetBoolean(2),CreateTime = reader.GetDateTime(3),UpdateTime = reader.GetDateTime(4)};}/// <summary>/// 处理日志/// </summary>/// <param name="writeCommand"></param>/// <returns></returns>/// <exception cref="ArgumentOutOfRangeException"></exception>protected override async Task WriteAsync(WriteCommand writeCommand){await using var connection = new MySqlConnection(_connectionString);await connection.OpenAsync();switch (writeCommand.CommandType){case WriteCommandType.Insert:{if (writeCommand.LogEntry != null){await using var command = new MySqlCommand(Consts.InsertSql, connection);command.Parameters.AddWithValue("@Id", writeCommand.LogEntry.Id);command.Parameters.AddWithValue("@Message", writeCommand.LogEntry.Message);command.Parameters.AddWithValue("@IsSuccess", writeCommand.LogEntry.IsSuccess);command.Parameters.AddWithValue("@CreateTime", writeCommand.LogEntry.CreateTime);command.Parameters.AddWithValue("@UpdateTime", writeCommand.LogEntry.UpdateTime);await command.ExecuteNonQueryAsync();}break;}case WriteCommandType.Update:{if (writeCommand.LogEntry != null){await using var command = new MySqlCommand(Consts.UpdateSql, connection);command.Parameters.AddWithValue("@Id", writeCommand.LogEntry.Id);command.Parameters.AddWithValue("@IsSuccess", writeCommand.LogEntry.IsSuccess);command.Parameters.AddWithValue("@UpdateTime", writeCommand.LogEntry.UpdateTime);await command.ExecuteNonQueryAsync();}break;}default:throw new ArgumentOutOfRangeException();}}
}

添加服务注册

using Logging.Abstractions;
using Logging.MySqlConnector;
using Microsoft.Extensions.Logging;namespace Microsoft.Extensions.DependencyInjection;/// <summary>
/// MySqlConnector 日志记录器扩展
/// </summary>
public static class MySqlConnectorCustomLoggerExtensions
{/// <summary>/// 添加 MySqlConnector 日志记录器/// </summary>/// <param name="services"></param>/// <param name="connectionString"></param>/// <returns></returns>public static IServiceCollection AddMySqlConnectorCustomLogger(this IServiceCollection services, string connectionString){if (string.IsNullOrEmpty(connectionString)){throw new ArgumentNullException(nameof(connectionString));}services.AddSingleton<ICustomLogger>(s =>{var logger = s.GetRequiredService<ILogger<MySqlConnectorCustomLogger>>();return new MySqlConnectorCustomLogger(connectionString, logger);});services.AddCustomLoggerMigration(connectionString);return services;}
}

4. 使用示例

下边是一个EntityFramework Core的实现使用示例，MySqlConnector的使用方式相同。
新建WebApi项目，添加Logging.EntityFrameworkCore

var builder = WebApplication.CreateBuilder(args);// Add services to the container.builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();// 添加EntityFrameworkCore日志记录器
var connectionString = builder.Configuration.GetConnectionString("MySql");
builder.Services.AddEfCoreCustomLogger(connectionString!);var app = builder.Build();// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{app.UseSwagger();app.UseSwaggerUI();
}app.UseAuthorization();app.MapControllers();app.Run();

在控制器中使用

namespace EntityFrameworkCoreTest.Controllers;[ApiController]
[Route("[controller]")]
public class TestController(ICustomLogger customLogger) : ControllerBase
{[HttpPost("InsertLog")]public IActionResult Post(CustomLogEntry model){customLogger.LogReceived(model);return Ok(); }[HttpPut("UpdateLog")]public IActionResult Put(string logId, MessageStatus status){customLogger.LogProcessed(logId, status);return Ok();}
}
 
标签: .net core , EF Core

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