6th part

go-sql-6.go

package main

import ( 
    "encoding/json" 
    "fmt" 
    "net/http" 
    "time"
)

func catch(err error) {
    if err != nil {
        panic(err)
    }
}

// respondwithError return error message
func respondWithError(w http.ResponseWriter, code int, msg string) {
    respondwithJSON(w, code, map[string]string{"message": msg})
}

// respondwithJSON write json response format
func respondwithJSON(w http.ResponseWriter, code int, payload interface{}) {
    response, _ := json.Marshal(payload)
    fmt.Println(payload)
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(code)
    w.Write(response)
}

// Logger return log message
func Logger() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        fmt.Println(time.Now(), r.Method, r.URL)
        router.ServeHTTP(w, r) // dispatch the request
    })
}