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.
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