Home >Backend Development >Golang >How Can I Customize Error Logging in Go\'s net/http Package?

How Can I Customize Error Logging in Go\'s net/http Package?

Susan Sarandon
Susan SarandonOriginal
2024-11-28 10:48:12751browse

How Can I Customize Error Logging in Go's net/http Package?

Logging Errors in Custom Format with net/http

In net/http, errors can be logged using the Server.ErrorLog field. To log errors in a custom format, you can replace the default logger with your own implementation.

Custom Logging Implementation

To create a custom logger, define a type that implements the io.Writer interface, as seen in the following example:

type CustomLogger struct {
    writer io.Writer
}

func (l *CustomLogger) Write(p []byte) (n int, err error) {
    // Implement custom logging logic here
}

Using Custom Logger in net/http

Once you have your custom logger, you can set it as the ErrorLog for the http.Server:

server := &http.Server{
    Addr:       ":8080",
    Handler:    myHandler,
    ErrorLog: &CustomLogger{writer: os.Stderr},
}

Using Zap Logger for net/http Error Logging

For errors to be written in the same format as Zap, you need to implement a serverJsonWriter type that forwards the error message to the Zap logger. Here's how:

type serverJsonWriter struct {
    fw *fwdToZapWriter
}

func (w serverJsonWriter) Write(p []byte) (n int, err error) {
    w.fw.logger.Errorw(string(p))
    return len(p), nil
}

Where fwdToZapWriter is:

type fwdToZapWriter struct {
    logger *zap.SugaredLogger
}

func (fw *fwdToZapWriter) Write(p []byte) (n int, err error) {
    fw.logger.Errorw(string(p))
    return len(p), nil
}

You can then use the serverJsonWriter type in your server:

server := &http.Server{
    Addr:       ":8080",
    Handler:    myHandler,
    ErrorLog: log.New(&serverJsonWriter{fw: &fwdToZapWriter{logger: myZapLogger}}, "", 0),
}

By implementing these steps, you can log net/http errors in your own custom format using your Zap logger.

The above is the detailed content of How Can I Customize Error Logging in Go\'s net/http Package?. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn