ch2

cmd/api/healthcheck.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func (app *application) healthcheckHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintln(w, "status: available")
+	fmt.Fprintf(w, "environment: %s\n", app.config.env)
+	fmt.Fprintf(w, "version: %s\n", version)
+}

cmd/api/helpers.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func (app *application) readIDParam(r *http.Request) (int64, error) {
+	params := httprouter.ParamsFromContext(r.Context())
+
+	id, err := strconv.ParseInt(params.ByName("id"), 10, 64)
+	if err != nil || id < 1 {
+		return 0, errors.New("invalid id parameter")
+	}
+	return id, nil
+}

cmd/api/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+const version = "1.0.0"
+
+type application struct {
+	config config
+	logger *log.Logger
+}
+
+type config struct {
+	port int
+	env  string
+}
+
+func main() {
+	var cfg config
+
+	flag.IntVar(&cfg.port, "port", 4000, "API server port")
+	flag.StringVar(&cfg.env, "env", "development", "Enivornment (development|staging|production)")
+	flag.Parse()
+
+	logger := log.New(os.Stdout, "", log.Ldate|log.Ltime)
+
+	app := &application{
+		config: cfg,
+		logger: logger,
+	}
+
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", app.config.port),
+		Handler:      app.routes(),
+		IdleTimeout:  time.Minute,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	logger.Printf("starting %s server on %s", cfg.env, srv.Addr)
+	err := srv.ListenAndServe()
+	logger.Fatal(err)
+}

cmd/api/movies.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func (app *application) createMovieHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintln(w, "create a new movie")
+}
+
+func (app *application) showMovieHandler(w http.ResponseWriter, r *http.Request) {
+	id, err := app.readIDParam(r)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	fmt.Fprintf(w, "show the details of movie %d\n", id)
+}

cmd/api/routes.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func (app *application) routes() *httprouter.Router {
+	router := httprouter.New()
+
+	router.HandlerFunc(http.MethodGet, "/v1/healtcheck", app.healthcheckHandler)
+	router.HandlerFunc(http.MethodPost, "/v1/movies", app.createMovieHandler)
+	router.HandlerFunc(http.MethodGet, "/v1/movies/:id", app.showMovieHandler)
+
+	return router
+}