为什么 Serilog PostgreSQL 接收器无法通过配置工作？

Question

我已经通过代码为 Serilog 尝试了 PostgreSQL sink，它非常有效。
这是工作代码：

    static void Main(string[] args)
    {
        var connectionString = "Server=localhost; Port=5432; Database=subscriptions_log; User Id=postgres;Password=postgres";
        string tableName = "errorlog";

        IDictionary<string, ColumnWriterBase> columnWriters = new Dictionary<string, ColumnWriterBase>
        {
            {"message", new RenderedMessageColumnWriter(NpgsqlDbType.Text) },
            {"level", new LevelColumnWriter(true, NpgsqlDbType.Varchar) },
            {"raise_date", new TimestampColumnWriter(NpgsqlDbType.Timestamp) },
            {"exception", new ExceptionColumnWriter(NpgsqlDbType.Text) }
        };

        using var log = new LoggerConfiguration()
            .WriteTo.Console()
            .WriteTo.PostgreSQL(connectionString, tableName, columnWriters)
            .CreateLogger();

        log.Information("Hello, Serilog!");
    }

但是当我通过配置文件使用它时，serlig 在数据库中创建了 table 但由于 "Npgsql.NpgsqlBinaryImporter.Complete()" 而没有插入任何行没有找到。
"这里是详细的错误：

Exception while emitting periodic batch from Serilog.Sinks.PostgreSQL.PostgreSQLSink:
        System.MissingMethodException:
        Method not found: 'Void Npgsql.NpgsqlBinaryImporter.Complete()'.
   at Serilog.Sinks.PostgreSQL.PostgreSQLSink.ProcessEventsByCopyCommand(IEnumerable`1 events, NpgsqlConnection connection)
   at Serilog.Sinks.PostgreSQL.PostgreSQLSink.EmitBatch(IEnumerable`1 events)
   at Serilog.Sinks.PeriodicBatching.PeriodicBatchingSink.EmitBatchAsync(IEnumerable`1 events)
   at Serilog.Sinks.PeriodicBatching.PeriodicBatchingSink.OnTick()

项目文件

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="5.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.CommandLine" Version="5.0.0"     />
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables"     Version="5.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0" />
    <PackageReference Include="Npgsql" Version="5.0.3" />
    <PackageReference Include="Serilog" Version="2.10.1-dev-01285" />
    <PackageReference Include="Serilog.Settings.Configuration" Version="3.2.0-dev-00264" />
    <PackageReference Include="Serilog.Sinks.Console" Version="4.0.0-dev-00839" />
    <PackageReference Include="Serilog.Sinks.File" Version="5.0.0-dev-00909" />
    <PackageReference Include="Serilog.Sinks.PeriodicBatching" Version="2.3.0" />
    <PackageReference Include="Serilog.Sinks.PostgreSQL" Version="2.2.0" />
    <PackageReference Include="Serilog.Sinks.PostgreSQL.Configuration" Version="1.0.0" />
  </ItemGroup>

</Project>

配置文件

        {
        "Serilog": {
            "Using": [ "Serilog.Sinks.PostgreSQL.Configuration" ],
            "MinimumLevel": "Debug",
            "Enrich": [ "WithMachineName" ],
            "WriteTo": [
                {
                    "Name": "PostgreSQL",
                    "Args": {
                        "connectionString": "LogsDb",
                        "tableName": "errorlogs",
                        "needAutoCreateTable": true
                    }
                }
            ]
        },
        "ConnectionStrings": {
            "LogsDb": "Server=localhost; Port=5432; Database=subscriptions_log; User Id=postgres;Password=postgres"
        },
        "Columns": {
            "message": "RenderedMessageColumnWriter",
            "level": {
                "Name": "LevelColumnWriter",
                "Args": {
                    "renderAsText": true,
                    "dbType": "Varchar"
                }
            },
            "raise_date": "TimestampColumnWriter",
            "exception": "ExceptionColumnWriter"
        }
    }

调用方式：

    static void Main(string[] args)
    {
        Serilog.Debugging.SelfLog.Enable(msg => Debug.WriteLine(msg));
        Serilog.Debugging.SelfLog.Enable(Console.Error);

        IConfiguration configuration = new ConfigurationBuilder()
            .SetBasePath(Path.GetFullPath(Path.Combine(Directory.GetCurrentDirectory(), "..", "..", "..")))
            .AddJsonFile("serilog.json", optional: false, reloadOnChange: true)
            .AddEnvironmentVariables()
            .AddCommandLine(args)
            .Build();

        using var log = new LoggerConfiguration()
            .ReadFrom.Configuration(configuration)
            .CreateLogger();

        log.Error("Hello, Serilog!");
    }

配置文件与描述的完全一致here。出于测试目的，我尝试使用 .net 5.0 和 3.1，但没有成功。
不幸的是，我无法通过代码使用它，因为我使用的是使用 serilog 登录到 sql 服务器的第 3 方库，我只能通过配置切换到 PostgrSQL。有帮助吗？

Answer 1

您收到此错误的原因是 Serilog.Sinks.PostgreSQL depends on Npgsql v4.0.2, but you are forcing an upgrade of Npgsql to v5.0.3 which is not compatible with the latest version of Serilog.Sinks.PostgreSQL (v2.2.0 在撰写本文时）。

<PackageReference Include="Npgsql" Version="5.0.3" />

In version 4.x the return type of the method NpgsqlBinaryImporter.Complete is void
In version 5.x the return type of the method NpgsqlBinaryImporter.Complete is ulong

这是导致 MissingMethodException 的 Npgsql 中的二进制重大更改，因为... 4.x 中预期的方法不再存在于 5.x 中。

一个直接的解决方案是删除 Npgsql 包引用并使用 v4.2.0，它将由 Serilog.Sinks.PostgreSQL 传递添加。或者，您可以将 Npgsql 升级到最新的 4.x 版本，在撰写本文时为 v4.1.8。

长期的解决方案是在 Serilog.Sinks.PostgreSQL 的 repo 中打开一个问题，这样他们就可以发布一个依赖 Npgsql 5.x.

的新版本

更新: 看起来 Serilog.Sinks.PostgreSQL is no longer maintained, and there's a fork of available here: https://github.com/SeppPenner/SerilogSinkForPostgreSQL 是最新的

为什么 Serilog PostgreSQL 接收器无法通过配置工作？

Why Serilog PostgreSQL sink is not working through Configuration?

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