manage clients via callback function

multiwriter.go

@@ -10,15 +10,12 @@ var _ io.Writer = &multiWriter{}
 
 func (t *multiWriter) Write(p []byte) (n int, err error) {
 	for _, w := range t.writers {
-		n, err = w.Write(p)
+		w.Write(p)
-		if err != nil || n != len(p) {
-			continue
-		}
 	}
 	return len(p), nil
 }
 
-func MultiWriter(writers ...io.Writer) io.Writer {
+func newMultiWriter(writers ...io.Writer) io.Writer {
 	allWriters := make([]io.Writer, 0, len(writers))
 	for _, w := range writers {
 		if mw, ok := w.(*multiWriter); ok {

server.go

@@ -14,9 +14,11 @@ type Server struct {
 	socketPath string
 	server     net.Listener
 	clients    *cmap.Map[net.Conn, struct{}]
+
+	onNewClient func(client net.Conn)
 }
 
-func Listen(socketPath string) (*Server, error) {
+func Listen(socketPath string, onNewClient func(client net.Conn)) (*Server, error) {
 	absPath, err := filepath.Abs(socketPath)
 	if err != nil {
 		return nil, err
@@ -28,10 +30,19 @@ func Listen(socketPath string) (*Server, error) {
 		return nil, err
 	}
 
+	if onNewClient == nil {
+		onNewClient = func(client net.Conn) {
+			data := make([]byte, 1024)
+			for _, err := client.Read(data); err == nil; _, err = client.Read(data) {
+			}
+		}
+	}
+
 	s := &Server{
 		socketPath:  absPath,
 		server:      server,
 		clients:     cmap.New[net.Conn, struct{}](),
+		onNewClient: onNewClient,
 	}
 
 	go s.handleClients()
@@ -41,7 +52,7 @@ func Listen(socketPath string) (*Server, error) {
 
 func (s *Server) Broadcast(r io.Reader) error {
 	clients := slices.Map(s.clients.Keys(), func(c net.Conn) io.Writer { return c })
-	w := MultiWriter(clients...)
+	w := newMultiWriter(clients...)
 
 	if _, err := io.Copy(w, r); err != nil {
 		return err
@@ -59,14 +70,11 @@ func (s *Server) handleClients() {
 func (s *Server) handleClient(client net.Conn) {
 	s.clients.Put(client, struct{}{})
 	defer s.clients.Delete(client)
-
+	s.onNewClient(client)
-	data := make([]byte, 1024)
-	for _, err := client.Read(data); err == nil; _, err = client.Read(data) {
-
-	}
 }
 
 func (s *Server) Close() error {
+	s.clients.Iter(func(client net.Conn, _ struct{}) { client.Close() })
 
 	if err := s.server.Close(); err != nil {
 		return err