How Can I Implement Custom Logging for net/http Errors Using Zap?

Custom Logging for net/http with Zap

Logging errors from net/http in a custom format requires implementing your own logging mechanism. The net/http package provides a Server struct that includes an ErrorLog field, allowing you to specify a custom logger.

Implementing a Custom Logger

To replace the default logger, create a custom implementation:

type AppLogger struct {
  log *zap.SugaredLogger
}

func (l *AppLogger) Error(message string, keyAndValues ...interface{}) {
  l.log.Errorw(message, keyAndValues...)
}

Integrating with net/http

Create a type that implements io.Writer and delegates to your custom logger:

type serverJsonWriter struct {
  *zap.Logger
}

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

Finally, instantiate a new http.Server and set the ErrorLog field to your custom writer:

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

where l is your zap logger instance.

Retrieving zap io.Writer

You can retrieve the zap io.Writer by calling logger.Writer() on the logger instance:

zapWriter := logger.Writer()

Additional Notes

• The serverJsonWriter type serializes log messages to JSON format, which matches the default format of zap.
• You can customize the serverJsonWriter type to add additional fields or formatting options specific to your logging needs.

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