traefik/middlewares/logger.go

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package middlewares
import (
"log"
"net/http"
"os"
"github.com/gorilla/handlers"
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)
// Logger is a middleware handler that logs the request as it goes in and the response as it goes out.
type Logger struct {
file *os.File
}
// NewLogger returns a new Logger instance.
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func NewLogger(file string) *Logger {
if len(file) > 0 {
fi, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
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if err != nil {
log.Fatal("Error opening file", err)
}
return &Logger{fi}
}
return &Logger{nil}
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}
func (l *Logger) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
if l.file == nil {
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next(rw, r)
} else {
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handlers.CombinedLoggingHandler(l.file, next).ServeHTTP(rw, r)
}
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}
// Close closes the logger (i.e. the file).
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func (l *Logger) Close() {
l.file.Close()
}