init

internal/app/server.go

@@ -0,0 +1,56 @@
+package app
+
+import (
+	"errors"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func startServers(cfg Config, handler http.Handler) ([]*http.Server, func(), error) {
+	var servers []*http.Server
+	cleanup := func() {}
+
+	if cfg.ListenAddr != "" {
+		srv := &http.Server{Addr: cfg.ListenAddr, Handler: handler}
+		servers = append(servers, srv)
+		go func() {
+			if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				log.Printf("tcp server error: %v", err)
+			}
+		}()
+	}
+
+	if cfg.UnixSocketPath != "" {
+		if err := os.MkdirAll(filepath.Dir(cfg.UnixSocketPath), 0o755); err != nil {
+			return nil, cleanup, err
+		}
+		_ = os.Remove(cfg.UnixSocketPath)
+		ln, err := net.Listen("unix", cfg.UnixSocketPath)
+		if err != nil {
+			return nil, cleanup, err
+		}
+		if err := os.Chmod(cfg.UnixSocketPath, 0o666); err != nil {
+			return nil, cleanup, err
+		}
+
+		srv := &http.Server{Handler: handler}
+		servers = append(servers, srv)
+		go func() {
+			if err := srv.Serve(ln); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				log.Printf("unix server error: %v", err)
+			}
+		}()
+		cleanup = func() {
+			_ = ln.Close()
+			_ = os.Remove(cfg.UnixSocketPath)
+		}
+	}
+
+	if len(servers) == 0 {
+		return nil, cleanup, errors.New("no listeners configured, set LISTEN_ADDR and/or UNIX_SOCKET_PATH")
+	}
+	return servers, cleanup, nil
+}