feat: go greenlight api wip

projects/greenlight/cmd/api/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+// Declare a string containing the application version number. Later in the book we'll
+// generate this automatically at build time, but for now we'll just store the version
+// number as a hard-coded global constant.
+const version = "1.0.0"
+
+// Define a config struct to hold all the configuration settings for our application.
+// For now, the only configuration settings will be the network port that we want the
+// server to listen on, and the name of the current operating environment for the
+// application (development, staging, production, etc.). We will read in these
+// configuration settings from command-line flags when the application starts.
+type config struct {
+	port int
+	env  string
+}
+
+// Define an application struct to hold the dependencies for our HTTP handlers, helpers,
+// and middleware. At the moment this only contains a copy of the config struct and a
+// logger, but it will grow to include a lot more as our build progresses.
+type application struct {
+	config config
+	logger *log.Logger
+}
+
+func main() {
+	var cfg config
+
+	flag.IntVar(&cfg.port, "port", 4000, "API server port")
+	flag.StringVar(&cfg.env, "env", "development", "Environment (development|staging|production)")
+	flag.Parse()
+
+	logger := log.New(os.Stdout, "", log.Ldate|log.Ltime)
+
+	app := &application{
+		config: cfg,
+		logger: logger,
+	}
+
+	// Use the httprouter instance returned by app.routes() as the server handler.
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", cfg.port),
+		Handler:      app.routes(),
+		IdleTimeout:  time.Minute,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 30 * time.Second,
+	}
+
+	logger.Printf("starting %s server on %s", cfg.env, srv.Addr)
+	err := srv.ListenAndServe()
+	logger.Fatal(err)
+}