How Can I Implement Custom Logging for net/http in Go?

Custom Logging in net/http

The net/http package provides a convenient way to handle HTTP requests and responses in Go applications. However, it uses its own default logger for error reporting. For customized error logging, it is possible to specify a custom logger for net/http's Server struct. This article demonstrates how to achieve this.

Implementing a Custom Logger

Suppose you have a custom logger implementation called AppLogger, which uses a zap logger internally. To integrate this custom logger with net/http, you can create a new type that implements the io.Writer interface and uses AppLogger to write errors.

type serverJsonWriter struct {
    io.Writer
}

func (w serverJsonWriter) Write(p []byte) (n int, err error) {
    // Here you would implement custom logging logic using your AppLogger
    // ...
    return len(p), nil
}

Populating the Server Struct

To use your custom logger with the Server struct, you simply need to set the ErrorLog field to an instance of your serverJsonWriter type. You will also need to use the zap logger that your AppLogger wraps to initialize the log.Logger.

logger, err := cfg.Build()
if err != nil {
    // Handle error
}

server := &http.Server{
    Addr:     addr,
    Handler:  handler,
    ErrorLog: logger.New(&serverJsonWriter{}, "", 0),
}

By implementing this method, net/http errors will be logged according to your custom specifications, allowing for more control over logging and error reporting in your application.

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