重构

common/data/socket/wscodec.go

@@ -0,0 +1,168 @@
+package socket
+
+import (
+	"bytes"
+	"errors"
+	"io"
+
+	"github.com/gobwas/ws"
+	"github.com/gobwas/ws/wsutil"
+	"github.com/panjf2000/gnet/v2"
+	"github.com/panjf2000/gnet/v2/pkg/logging"
+)
+
+type Conn struct {
+	MainConn gnet.Conn `struc:"[0]pad"` //TODO 不序列化,,序列化下面的作为blob存数据库
+}
+
+func NewConn(c gnet.Conn) *Conn {
+	return &Conn{MainConn: c}
+}
+
+type WsCodec struct {
+	Upgraded bool         // 链接是否升级
+	Buf      bytes.Buffer // 从实际socket中读取到的数据缓存
+	wsMsgBuf wsMessageBuf // ws 消息缓存
+	//Isinitws bool
+}
+
+type wsMessageBuf struct {
+	curHeader *ws.Header
+	cachedBuf bytes.Buffer
+}
+
+type readWrite struct {
+	io.Reader
+	io.Writer
+}
+
+func (w *WsCodec) Upgrade(c gnet.Conn) (ok bool, action gnet.Action) {
+	if w.Upgraded {
+		ok = true
+		return
+	}
+	buf := &w.Buf
+	tmpReader := bytes.NewReader(buf.Bytes())
+	oldLen := tmpReader.Len()
+	logging.Infof("do Upgrade")
+
+	hs, err := ws.Upgrade(readWrite{tmpReader, c})
+	skipN := oldLen - tmpReader.Len()
+	if err != nil {
+		if err == io.EOF || errors.Is(err, io.ErrUnexpectedEOF) { //数据不完整，不跳过 buf 中的 skipN 字节（此时 buf 中存放的仅是部分 "handshake data" bytes），下次再尝试读取
+			return
+		}
+		buf.Next(skipN)
+		logging.Errorf("conn[%v] [err=%v]", c.RemoteAddr().String(), err.Error())
+		action = gnet.Close
+		return
+	}
+	buf.Next(skipN)
+	logging.Infof("conn[%v] upgrade websocket protocol! Handshake: %v", c.RemoteAddr().String(), hs)
+
+	ok = true
+	w.Upgraded = true
+	return
+}
+func (w *WsCodec) ReadBufferBytes(c gnet.Conn) (gnet.Action, int) {
+	size := c.InboundBuffered()
+	//buf := make([]byte, size)
+	read, err := c.Peek(size)
+	if err != nil {
+		logging.Errorf("read err! %v", err)
+		return gnet.Close, 0
+	}
+	// if read < size {
+	// 	logging.Errorf("read bytes len err! size: %d read: %d", size, read)
+	// 	return gnet.Close
+	// }
+	w.Buf.Write(read)
+	return gnet.None, size
+}
+func (w *WsCodec) Decode(c gnet.Conn) (outs []wsutil.Message, err error) {
+	//	fmt.Println("do Decode")
+	messages, err := w.readWsMessages()
+	if err != nil {
+		logging.Errorf("Error reading message! %v", err)
+		return nil, err
+	}
+	if messages == nil || len(messages) <= 0 { //没有读到完整数据 不处理
+		return
+	}
+	for _, message := range messages {
+		if message.OpCode.IsControl() {
+			err = wsutil.HandleClientControlMessage(c, message)
+			if err != nil {
+				return
+			}
+			continue
+		}
+		if message.OpCode == ws.OpText || message.OpCode == ws.OpBinary {
+			outs = append(outs, message)
+		}
+	}
+	return
+}
+
+func (w *WsCodec) readWsMessages() (messages []wsutil.Message, err error) {
+	msgBuf := &w.wsMsgBuf
+	in := &w.Buf
+	for {
+		// 从 in 中读出 header，并将 header bytes 写入 msgBuf.cachedBuf
+		if msgBuf.curHeader == nil {
+			if in.Len() < ws.MinHeaderSize { //头长度至少是2
+				return
+			}
+			var head ws.Header
+			if in.Len() >= ws.MaxHeaderSize {
+				head, err = ws.ReadHeader(in)
+				if err != nil {
+					return messages, err
+				}
+			} else { //有可能不完整，构建新的 reader 读取 head，读取成功才实际对 in 进行读操作
+				tmpReader := bytes.NewReader(in.Bytes())
+				oldLen := tmpReader.Len()
+				head, err = ws.ReadHeader(tmpReader)
+				skipN := oldLen - tmpReader.Len()
+				if err != nil {
+					if err == io.EOF || errors.Is(err, io.ErrUnexpectedEOF) { //数据不完整
+						return messages, nil
+					}
+					in.Next(skipN)
+					return nil, err
+				}
+				in.Next(skipN)
+			}
+
+			msgBuf.curHeader = &head
+			err = ws.WriteHeader(&msgBuf.cachedBuf, head)
+			if err != nil {
+				return nil, err
+			}
+		}
+		dataLen := (int)(msgBuf.curHeader.Length)
+		// 从 in 中读出 data，并将 data bytes 写入 msgBuf.cachedBuf
+		if dataLen > 0 {
+			if in.Len() < dataLen { //数据不完整
+
+				logging.Infof("incomplete data")
+				return
+			}
+
+			_, err = io.CopyN(&msgBuf.cachedBuf, in, int64(dataLen))
+			if err != nil {
+				return
+			}
+		}
+		if msgBuf.curHeader.Fin { //当前 header 已经是一个完整消息
+			messages, err = wsutil.ReadClientMessage(&msgBuf.cachedBuf, messages)
+			if err != nil {
+				return nil, err
+			}
+			msgBuf.cachedBuf.Reset()
+		} else {
+			logging.Infof("The data is split into multiple frames")
+		}
+		msgBuf.curHeader = nil
+	}
+}