gistfile1.go

package main

import (
    "fmt"
    "net/http"
    "log"
    "io"
    "io/ioutil"
    "os"
    "github.com/gorilla/mux"
)

var (
    TRACE   *log.Logger
    INFO    *log.Logger
    WARNING *log.Logger
    ERROR   *log.Logger
)

func initLogger(traceHandle io.Writer, infoHandle io.Writer, warningHandle io.Writer, errorHandle io.Writer) {
	TRACE = log.New(traceHandle,
        "TRACE: ",
        log.Ldate|log.Ltime|log.Lshortfile)

    INFO = log.New(infoHandle,
        "INFO: ",
        log.Ldate|log.Ltime|log.Lshortfile)

    WARNING = log.New(warningHandle,
        "WARNING: ",
        log.Ldate|log.Ltime|log.Lshortfile)

    ERROR = log.New(errorHandle,
        "ERROR: ",
        log.Ldate|log.Ltime|log.Lshortfile)
}

func PageHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Serving %s!", r.URL.Path[1:])
}

func ChainedHandler(h http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    INFO.Println(r.URL.Path)
    h.ServeHTTP(w, r)
  })
}

func main() {
	initLogger(ioutil.Discard, os.Stdout, os.Stdout, os.Stderr)
	router := mux.NewRouter()
	router.HandleFunc("/{page}", PageHandler)
	chained_handler := ChainedHandler(router)
    http.ListenAndServe(":8080", chained_handler)
}