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Golang: Log HTTP Requests in Go
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package main | |
import ( | |
"fmt" | |
"log" | |
"net/http" | |
"os" | |
) | |
func main() { | |
logPath := "development.log" | |
httpPort := 4000 | |
openLogFile(logPath) | |
log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile) | |
http.HandleFunc("/", rootHandler) | |
fmt.Printf("listening on %v\n", httpPort) | |
fmt.Printf("Logging to %v\n", logPath) | |
err := http.ListenAndServe(fmt.Sprintf(":%d", httpPort), logRequest(http.DefaultServeMux)) | |
if err != nil { | |
log.Fatal(err) | |
} | |
} | |
func rootHandler(w http.ResponseWriter, r *http.Request) { | |
fmt.Fprintf(w, "<h1>Hello World</h1><div>Welcome to whereever you are</div>") | |
} | |
func logRequest(handler http.Handler) http.Handler { | |
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
log.Printf("%s %s %s\n", r.RemoteAddr, r.Method, r.URL) | |
handler.ServeHTTP(w, r) | |
}) | |
} | |
func openLogFile(logfile string) { | |
if logfile != "" { | |
lf, err := os.OpenFile(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640) | |
if err != nil { | |
log.Fatal("OpenLogfile: os.OpenFile:", err) | |
} | |
log.SetOutput(lf) | |
} | |
} |
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