How to Implement Custom Logging for net/http Errors Using a Custom Logger?

Custom Logging for net/http Errors with Custom Logger Implementation

To log errors from net/http in a custom format, the ErrorLog field of the net/http.Server struct can be utilized. Customizing this logger involves substituting it with an implementation that adheres to the io.Writer interface.

Implementing Custom Logger

In the provided example, an AppLogger struct has been defined for logging errors. To align with net/http's ErrorLog specification, this AppLogger can be modified to implement io.Writer:

type AppLogger struct {
    log *zap.SugaredLogger
}

func (l *AppLogger) Write(p []byte) (n int, err error) {
    l.log.Errorw(string(p))
    return len(p), nil
}

Integrating with net/http.Server

To integrate the custom logger with the net/http.Server, instantiate it and assign it to the ErrorLog field:

server := &http.Server{
    Addr:     addr,
    Handler:  handler,
    ErrorLog: &AppLogger{logger}, // Use the custom AppLogger
}

Using Zap Logger

To use the Zap logger with the custom AppLogger, the following steps can be taken:

1. Create a new Zap Logger with the desired configuration.
2. Pass the Zap Logger to the AppLogger instance when initializing it.
3. Set the ErrorLog field of the net/http.Server to the AppLogger instance.

Conclusion

By implementing a custom io.Writer-based logger like the AppLogger, errors from net/http can be logged in a format that aligns with the application's logging strategy. This enables统一 and flexible error logging across the system.

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