feat: logger, middleware

projects/greenlight/cmd/api/main.go

@@ -13,6 +13,7 @@ import (
 	"github.com/joho/godotenv"
 	_ "github.com/lib/pq"
 	"greenlight.debuggingjon.dev/internal/data"
+	"greenlight.debuggingjon.dev/internal/jsonlog"
 )
 
 // Declare a string containing the application version number. Later in the book we'll
@@ -41,17 +42,20 @@ type config struct {
 // logger, but it will grow to include a lot more as our build progresses.
 type application struct {
 	config config
-	logger *log.Logger
+	logger *jsonlog.Logger
 	models data.Models
 }
 
 func main() {
-	logger := log.New(os.Stdout, "", log.Ldate|log.Ltime)
 	var cfg config
 
+	// Initialize a new jsonlog.Logger which writes any messages *at or above* the INFO
+	// severity level to the standard out stream.
+	logger := jsonlog.New(os.Stdout, jsonlog.LevelInfo)
+
 	err := godotenv.Load()
 	if err != nil {
-		logger.Fatal(err)
+		logger.PrintFatal(err, nil)
 	}
 	dsn := os.Getenv("DATABASE_DSN")
 
@@ -73,7 +77,7 @@ func main() {
 	// application immediately.
 	db, err := openDB(cfg)
 	if err != nil {
-		logger.Fatal(err)
+		logger.PrintFatal(err, nil)
 	}
 
 	// Defer a call to db.Close() so that the connection pool is closed before the
@@ -85,7 +89,7 @@ func main() {
 	}()
 	// Also log a message to say that the connection pool has been successfully
 	// established.
-	logger.Printf("database connection pool established")
+	logger.PrintInfo("database connection pool established", nil)
 
 	app := &application{
 		config: cfg,
@@ -98,13 +102,17 @@ func main() {
 		Addr:         fmt.Sprintf(":%d", cfg.port),
 		Handler:      app.routes(),
 		IdleTimeout:  time.Minute,
+		ErrorLog:     log.New(logger, "", 0),
 		ReadTimeout:  10 * time.Second,
 		WriteTimeout: 30 * time.Second,
 	}
 
-	logger.Printf("starting %s server on %s", cfg.env, srv.Addr)
+	logger.PrintInfo("starting server", map[string]string{
+		"addr": srv.Addr,
+		"env":  cfg.env,
+	})
 	err = srv.ListenAndServe()
-	logger.Fatal(err)
+	logger.PrintFatal(err, nil)
 }
 
 func openDB(cfg config) (*sql.DB, error) {