Adding goroutine to intercept SIGINT and SIGTERM signals to properly shutdown the app.

cmd/api/server.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"log/slog"
 	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
 	"time"
 )
 
@@ -18,6 +21,24 @@ func (app *application) serve() error {
 		ErrorLog:     slog.NewLogLogger(app.logger.Handler(), slog.LevelError),
 	}
 
+	// Start a background goroutine
+	go func() {
+		// Create a quit channel which carries os.Signal values
+		quit := make(chan os.Signal, 1)
+
+		// Use signal.Notify() to listen for incoming SIGINT and SIGTERM signals and relay them to the quit channel. Any other signals will not be caught by signal.Notify() and will retain their default behavior
+		signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+
+		// Read the signal from the quit channel. This code will block until a signal is received.
+		s := <-quit
+
+		// Log a message to say that the signal has been caught. Notice that we also call the String() method on the signal to get the signal name and include it in the log entry attributes
+		app.logger.Info("caught signal", "signal", s.String())
+
+		// Exit the application with a 0 (success) status code.
+		os.Exit(0)
+	}()
+
 	// Start the HTTP server.
 	app.logger.Info("starting server", "addr", srv.Addr, "env", app.config.env)