first commit. added CI, Docker compose, blank client and server. used unit tests, they pass

server/cmd/api/main.go

@@ -0,0 +1,61 @@
+// Command api is the HTTP entrypoint of the messenger backend.
+//
+// It wires configuration, logging and the HTTP server together and
+// supports graceful shutdown on SIGINT/SIGTERM.
+package main
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"messenger/internal/platform/config"
+	"messenger/internal/platform/logger"
+	"messenger/internal/server"
+)
+
+func main() {
+	log := logger.New()
+
+	cfg, err := config.Load()
+	if err != nil {
+		log.Error("invalid configuration", "error", err)
+		os.Exit(1)
+	}
+
+	httpServer := server.New(cfg, log)
+
+	// Run the server in a goroutine so that shutdown can be triggered
+	// from the signal handler below.
+	go func() {
+		log.Info("http server listening",
+			"addr", cfg.HTTPAddr,
+			"static_dir", cfg.StaticDir,
+			"env", cfg.Environment,
+		)
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Error("http server failed", "error", err)
+			os.Exit(1)
+		}
+	}()
+
+	// Wait for a termination signal, then drain in-flight requests.
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	<-ctx.Done()
+	log.Info("shutting down")
+
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	if err := httpServer.Shutdown(shutdownCtx); err != nil {
+		log.Error("graceful shutdown failed", "error", err)
+		os.Exit(1)
+	}
+	log.Info("server stopped cleanly")
+}