add output to TCP server

tcp-server.go

@@ -1,10 +1,13 @@
 package showbridge
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
 	"net"
+	"slices"
 	"sync"
+	"syscall"
 	"time"
 
 	"github.com/jwetzell/showbridge-go/internal/framing"
@@ -18,6 +21,8 @@ type TCPServer struct {
 	router        *Router
 	quit          chan interface{}
 	wg            sync.WaitGroup
+	connections   []net.Conn
+	connectionsMu sync.RWMutex
 }
 
 func init() {
@@ -78,6 +83,9 @@ func (ts *TCPServer) RegisterRouter(router *Router) {
 }
 
 func (ts *TCPServer) handleClient(client net.Conn) {
+	ts.connectionsMu.Lock()
+	ts.connections = append(ts.connections, client)
+	ts.connectionsMu.Unlock()
 	slog.Debug("connection accepted", "id", ts.config.Id, "remoteAddr", client.RemoteAddr().String())
 	defer client.Close()
 	var framer framing.Framer
@@ -105,11 +113,34 @@ ClientRead:
 
 			if err != nil {
 				//NOTE(jwetzell) we hit deadline
-				if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
+				if opErr, ok := err.(*net.OpError); ok {
+					if opErr.Timeout() {
 						continue ClientRead
 					}
-				if err.Error() == "EOF" {
+					fmt.Println(opErr.Err)
+					if errors.Is(opErr, syscall.ECONNRESET) {
+						ts.connectionsMu.Lock()
+						for i := 0; i < len(ts.connections); i++ {
+							if ts.connections[i] == client {
+								ts.connections = slices.Delete(ts.connections, i, i+1)
+								break
+							}
+						}
 						slog.Debug("connection closed", "id", ts.config.Id, "remoteAddr", client.RemoteAddr().String())
+						ts.connectionsMu.Unlock()
+					}
+				}
+
+				if err.Error() == "EOF" {
+					ts.connectionsMu.Lock()
+					for i := 0; i < len(ts.connections); i++ {
+						if ts.connections[i] == client {
+							ts.connections = slices.Delete(ts.connections, i, i+1)
+							break
+						}
+					}
+					slog.Debug("connection closed", "id", ts.config.Id, "remoteAddr", client.RemoteAddr().String())
+					ts.connectionsMu.Unlock()
 				}
 				return
 			}
@@ -168,5 +199,24 @@ AcceptLoop:
 }
 
 func (ts *TCPServer) Output(payload any) error {
-	return fmt.Errorf("net.tcp.server output is not implemented")
+	payloadBytes, ok := payload.([]byte)
+
+	if !ok {
+		return fmt.Errorf("net.tcp.server is only able to output bytes")
+	}
+	ts.connectionsMu.Lock()
+	errorString := ""
+
+	for _, connection := range ts.connections {
+		_, err := connection.Write(payloadBytes)
+		if err != nil {
+			errorString += fmt.Sprintf("%s\n", err.Error())
+		}
+	}
+	ts.connectionsMu.Unlock()
+
+	if errorString == "" {
+		return nil
+	}
+	return fmt.Errorf("%s", errorString)
 }