add go fiber example

go-fiber-simple/cmd/api/healthcheck.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"net/http"
+)
+
+func (app *application) healthcheckHandler(w http.ResponseWriter, r *http.Request) {
+	data := map[string]string{
+		"status":  "ok",
+		"version": version,
+	}
+
+	// No need to add acess control origin headers. On other routes, that may be necessary
+	err := app.writeJSON(w, http.StatusOK, data, nil)
+	if err != nil {
+		app.logger.Error(err.Error())
+		http.Error(w, "server error", http.StatusInternalServerError)
+	}
+}

go-fiber-simple/cmd/api/helpers.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// The writeJSON() method is a generic helper for writing JSON to a response
+func (app *application) writeJSON(w http.ResponseWriter, sCode int, data any, headers http.Header) error {
+	marshalledJson, err := json.Marshal(data)
+
+	if err != nil {
+		return err
+	}
+
+	// Valid json requires newline
+	marshalledJson = append(marshalledJson, '\n')
+
+	for key, value := range headers {
+		w.Header()[key] = value
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(sCode)
+	w.Write(marshalledJson)
+
+	return nil
+}

go-fiber-simple/cmd/api/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+)
+
+const version = "0.0.1"
+
+type config struct {
+	port int
+}
+
+type application struct {
+	config config
+	logger *slog.Logger
+}
+
+func main() {
+
+	var cfg config
+
+	// Try to read environment variable for port (given by railway). Otherwise use default
+	port := os.Getenv("PORT")
+	intPort, err := strconv.Atoi(port)
+	if err != nil {
+		intPort = 4000
+	}
+
+	// Set the port to run the API on
+	cfg.port = intPort
+
+	// create the logger
+	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
+
+	// create the application
+	app := &application{
+		config: cfg,
+		logger: logger,
+	}
+
+	// create the server
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", cfg.port),
+		Handler:      app.routes(),
+		IdleTimeout:  45 * time.Second,
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 10 * time.Second,
+		ErrorLog:     slog.NewLogLogger(logger.Handler(), slog.LevelError),
+	}
+
+	logger.Info("server started", "addr", srv.Addr)
+
+	// Start the server
+	err = srv.ListenAndServe()
+	logger.Error(err.Error())
+	os.Exit(1)
+
+}

go-fiber-simple/cmd/api/routes.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func (app *application) routes() *httprouter.Router {
+	router := httprouter.New()
+
+	// Define the available routes
+	router.HandlerFunc(http.MethodGet, "/v1/healthcheck", app.healthcheckHandler)
+
+	return router
+}