Add basic webserver skeleton with healthcheck

internal/handlers/handlers.go

@@ -0,0 +1,60 @@
+// Package handlers provides HTTP request handlers.
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"log/slog"
+	"net/http"
+
+	"go.uber.org/fx"
+	"sneak.berlin/go/pixa/internal/healthcheck"
+	"sneak.berlin/go/pixa/internal/logger"
+)
+
+// HandlersParams defines dependencies for Handlers.
+type HandlersParams struct {
+	fx.In
+	Logger      *logger.Logger
+	Healthcheck *healthcheck.Healthcheck
+}
+
+// Handlers provides HTTP request handlers.
+type Handlers struct {
+	log *slog.Logger
+	hc  *healthcheck.Healthcheck
+}
+
+// New creates a new Handlers instance.
+func New(lc fx.Lifecycle, params HandlersParams) (*Handlers, error) {
+	s := &Handlers{
+		log: params.Logger.Get(),
+		hc:  params.Healthcheck,
+	}
+
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			return nil
+		},
+	})
+
+	return s, nil
+}
+
+func (s *Handlers) respondJSON(w http.ResponseWriter, data interface{}, status int) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	if data != nil {
+		err := json.NewEncoder(w).Encode(data)
+		if err != nil {
+			s.log.Error("json encode error", "error", err)
+		}
+	}
+}
+
+func (s *Handlers) respondError(w http.ResponseWriter, code string, message string, status int) {
+	s.respondJSON(w, map[string]string{
+		"error":   code,
+		"message": message,
+	}, status)
+}