使用 Serilog 记录时，我无法将用户添加到我在 Postgresql 中创建的列

Question

我正在通过下面的 LoggerConfiguration 创建自定义列。然后，使用我编写的中间件和 UsernameColumnWriter 类，我想在发出请求时在此列中打印 Postgresql 上登录用户的名称。表格和列正在形成，没有任何问题。但是，当我发出请求时，尽管创建了日志记录，但 user_name 列仍为空。

Serilog 配置：

Logger log = new LoggerConfiguration()
.WriteTo.PostgreSQL(builder.Configuration.GetConnectionString("ConnectionString"),
    "Logs",
    needAutoCreateTable: true,
    columnOptions: new Dictionary<string, ColumnWriterBase>
    {
        {"message", new RenderedMessageColumnWriter(NpgsqlDbType.Text)},
        {"message_template", new MessageTemplateColumnWriter(NpgsqlDbType.Text)},
        {"level", new LevelColumnWriter(true , NpgsqlDbType.Varchar)},
        {"time_stamp", new TimestampColumnWriter(NpgsqlDbType.Timestamp)},
        {"exception", new ExceptionColumnWriter(NpgsqlDbType.Text)},
        {"log_event", new LogEventSerializedColumnWriter(NpgsqlDbType.Json)},
        {"user_name", new UsernameColumnWriter()}
    })
.WriteTo.Debug()
.WriteTo.Console()
.MinimumLevel.Information()
.CreateLogger();

builder.Host.UseSerilog(log);

中间件：

app.UseSerilogRequestLogging();
app.UseHttpLogging();

app.UseAuthentication();
app.UseAuthorization();

app.Use(async (context, next) => {
    var username = context.User?.Identity?.IsAuthenticated != null || true ? 
        context.User.Identity.Name : null;
    LogContext.PushProperty("user_name", username);
    await next();
});

我的班级：

    public class UsernameColumnWriter : ColumnWriterBase {
        public UsernameColumnWriter() : base(NpgsqlDbType.Varchar) {
        }

        public override object GetValue(LogEvent logEvent, IFormatProvider formatProvider = null) {
        var (username, value) = logEvent.Properties.FirstOrDefault(p => p.Key == "user_name");
        return value?.ToString() ?? null;
    }
}

Answer 1

您想使用

LogContext

中的属性，但您的配置缺少所需部分：

...
.Enrich.FromLogContext()
...

所以您的最终配置应如下所示：

Logger log = new LoggerConfiguration()
.WriteTo.PostgreSQL(builder.Configuration.GetConnectionString("3pmConnectionString"),
    "Logs",
    needAutoCreateTable: true,
    columnOptions: new Dictionary<string, ColumnWriterBase>
    {
        {"message", new RenderedMessageColumnWriter(NpgsqlDbType.Text)},
        {"message_template", new MessageTemplateColumnWriter(NpgsqlDbType.Text)},
        {"level", new LevelColumnWriter(true , NpgsqlDbType.Varchar)},
        {"time_stamp", new TimestampColumnWriter(NpgsqlDbType.Timestamp)},
        {"exception", new ExceptionColumnWriter(NpgsqlDbType.Text)},
        {"log_event", new LogEventSerializedColumnWriter(NpgsqlDbType.Json)},
        {"user_name", new UsernameColumnWriter()}
    })
.WriteTo.Debug()
.WriteTo.Console()
.MinimumLevel.Information()
.Enrich.FromLogContext() // <--
.CreateLogger();