REST API Server using gorilla/mux

main #

In the code below, the rest package is imported and the ServeAPI method is called.

package main
import (
    "fmt"
    "github.com/esperer/golang_mq/rest"
)

func main() {
    rest.ServeAPI("127.0.0.1:8888")
    fmt.Println("REST API SERVER START")
}

Looking at the called ServeAPI method, it can be seen that it performs the task of mapping routes.

package rest

import (
    "fmt"
    "net/http"
    "time"
    "github/gorilla/mux"
)

func ServeAPI(listneAddr string) {
    r := mux.NewRouter()
    r.Methods("get").Path("/").Handler(&IndexHandler{})
    r.Methods("get").Path("/event/{eventId}/booking").Handler(&CreateBookingHandler{})

    src := http.Server{
        Handler: r,
        Addr: listenAddr,
        WriteTimeout: 2 * time.Second,
        ReadTimeout: 1 * time.Second
    }

    err := srv.ListenAndServe()

    if err != nil {
        fmt.Println("err : ", err)
    }
}

Here, http.Handler is required as an argument for .Handler().

Let's check how http.Handler is defined. http.Handler is an interface that includes the ServeHTTP method. Therefore, in r.Methods("get").Path("/").Handler(&IndexHandler{}), IndexHandler must implement the ServeHTTP method.

Looking at the code below, it can be seen that the IndexHandler struct includes ServeHTTP.

package rest
import (
	"net/http"
)
type IndexHandler struct {
	 
}
func (h *IndexHandler) ServeHTTP(w http.ResponseWriter, r *http.Request){
	w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusOK)
    w.Write( []byte("Server is running "))
}