From 27c02549c870680ea57a05757810ade80db42929 Mon Sep 17 00:00:00 2001
From: NikkyAI <root@nikky.moe>
Date: Wed, 26 Aug 2020 22:27:00 +0200
Subject: Replace gorilla with melody for websocket API (#1205)

---
 bridge/api/api.go | 76 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 42 insertions(+), 34 deletions(-)

(limited to 'bridge')

diff --git a/bridge/api/api.go b/bridge/api/api.go
index 62336881..9c937565 100644
--- a/bridge/api/api.go
+++ b/bridge/api/api.go
@@ -6,9 +6,10 @@ import (
 	"sync"
 	"time"
 
+	"gopkg.in/olahol/melody.v1"
+
 	"github.com/42wim/matterbridge/bridge"
 	"github.com/42wim/matterbridge/bridge/config"
-	"github.com/gorilla/websocket"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
 	ring "github.com/zfjagann/golang-ring"
@@ -18,6 +19,7 @@ type API struct {
 	Messages ring.Ring
 	sync.RWMutex
 	*bridge.Config
+	mrouter *melody.Melody
 }
 
 type Message struct {
@@ -33,6 +35,32 @@ func New(cfg *bridge.Config) bridge.Bridger {
 	e := echo.New()
 	e.HideBanner = true
 	e.HidePort = true
+
+	b.mrouter = melody.New()
+	b.mrouter.HandleMessage(func(s *melody.Session, msg []byte) {
+		message := config.Message{}
+		err := json.Unmarshal(msg, &message)
+		if err != nil {
+			b.Log.Errorf("failed to decode message from byte[] '%s'", string(msg))
+			return
+		}
+		b.handleWebsocketMessage(message)
+	})
+	b.mrouter.HandleConnect(func(session *melody.Session) {
+		greet := b.getGreeting()
+		data, err := json.Marshal(greet)
+		if err != nil {
+			b.Log.Errorf("failed to encode message '%v'", greet)
+			return
+		}
+		err = session.Write(data)
+		if err != nil {
+			b.Log.Errorf("failed to write message '%s'", string(data))
+			return
+		}
+		// TODO: send message history buffer from `b.Messages` here
+	})
+
 	b.Messages = ring.Ring{}
 	if b.GetInt("Buffer") != 0 {
 		b.Messages.SetCapacity(b.GetInt("Buffer"))
@@ -67,13 +95,13 @@ func New(cfg *bridge.Config) bridge.Bridger {
 func (b *API) Connect() error {
 	return nil
 }
+
 func (b *API) Disconnect() error {
 	return nil
-
 }
+
 func (b *API) JoinChannel(channel config.ChannelInfo) error {
 	return nil
-
 }
 
 func (b *API) Send(msg config.Message) (string, error) {
@@ -83,7 +111,14 @@ func (b *API) Send(msg config.Message) (string, error) {
 	if msg.Event == config.EventMsgDelete {
 		return "", nil
 	}
-	b.Messages.Enqueue(&msg)
+	b.Log.Debugf("enqueueing message from %s on ring buffer", msg.Username)
+	b.Messages.Enqueue(msg)
+
+	data, err := json.Marshal(msg)
+	if err != nil {
+		b.Log.Errorf("failed to encode message  '%s'", msg)
+	}
+	_ = b.mrouter.Broadcast(data)
 	return "", nil
 }
 
@@ -131,6 +166,7 @@ func (b *API) handleStream(c echo.Context) error {
 	}
 	c.Response().Flush()
 	for {
+		// TODO: this causes issues, messages should be broadcasted to all connected clients
 		msg := b.Messages.Dequeue()
 		if msg != nil {
 			if err := json.NewEncoder(c.Response()).Encode(msg); err != nil {
@@ -153,40 +189,12 @@ func (b *API) handleWebsocketMessage(message config.Message) {
 	b.Remote <- message
 }
 
-func (b *API) writePump(conn *websocket.Conn) {
-	for {
-		msg := b.Messages.Dequeue()
-		if msg != nil {
-			err := conn.WriteJSON(msg)
-			if err != nil {
-				break
-			}
-		}
-	}
-}
-
-func (b *API) readPump(conn *websocket.Conn) {
-	for {
-		message := config.Message{}
-		err := conn.ReadJSON(&message)
-		if err != nil {
-			break
-		}
-		b.handleWebsocketMessage(message)
-	}
-}
-
 func (b *API) handleWebsocket(c echo.Context) error {
-	conn, err := websocket.Upgrade(c.Response().Writer, c.Request(), nil, 1024, 1024)
+	err := b.mrouter.HandleRequest(c.Response(), c.Request())
 	if err != nil {
+		b.Log.Errorf("error in websocket handling  '%v'", err)
 		return err
 	}
 
-	greet := b.getGreeting()
-	_ = conn.WriteJSON(greet)
-
-	go b.writePump(conn)
-	go b.readPump(conn)
-
 	return nil
 }
-- 
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