/
client.go
250 lines (221 loc) · 5 KB
/
client.go
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package wslt
import (
"bytes"
"errors"
"fmt"
"sync"
"time"
"github.com/atcharles/wslt/ws_rpc"
"github.com/gorilla/websocket"
)
func NewClient(urlStr string) (ws *Client, err error) {
ws = &Client{
conn: nil,
closed: false,
closeChan: make(chan byte, 1),
sent: make(chan *WsMessage, 256),
businessHandlers: make(map[string]ClientBusinessHandler),
rpcMessages: make(map[string]ws_rpc.CallHandler),
}
if err = ws.Dial(urlStr); err != nil {
err = fmt.Errorf("Client Dial error:%s\n", err.Error())
return
}
go ws.readPump()
go ws.writePump()
return
}
type ClientBusinessHandler func(*ClientContext)
type (
Client struct {
mu sync.RWMutex
conn *websocket.Conn
closed bool
closeChan chan byte
sent chan *WsMessage
businessHandlers map[string]ClientBusinessHandler
rpcMessages map[string]ws_rpc.CallHandler
}
)
func (c *Client) AddCallHandler(rid string, handler ws_rpc.CallHandler) {
c.mu.Lock()
c.rpcMessages[rid] = handler
c.mu.Unlock()
}
func (c *Client) RemoveHandler(rid string) {
c.mu.Lock()
delete(c.rpcMessages, rid)
c.mu.Unlock()
}
func (c *Client) GetHandler(rid string) (handler ws_rpc.CallHandler, ok bool) {
c.mu.Lock()
handler, ok = c.rpcMessages[rid]
c.mu.Unlock()
return
}
func (c *Client) CloseChan() <-chan byte {
return c.closeChan
}
func (c *Client) Close() {
c.close()
}
func (c *Client) IsClosed() (closed bool) {
c.mu.Lock()
closed = c.closed
c.mu.Unlock()
return
}
//ReadHandle 设置客户端读取操作函数
func (c *Client) ReadHandle(typeStr string, handler ClientBusinessHandler) {
c.mu.Lock()
c.businessHandlers[typeStr] = handler
c.mu.Unlock()
}
//SendMessage msgData is a BusinessMessage's RawData
func (c *Client) SendMessage(typeString string, msgData interface{}) (err error) {
var msg *WsMessage
defer func() {
if err != nil {
StdLogger.Printf("发送数据失败:%s\n", err.Error())
}
}()
if msgData == nil {
err = errors.New("数据格式错误,nil pointer")
return
}
if c.IsClosed() {
StdLogger.Printf("发送消息[%#v]时,客户端已断开连接", msgData)
return
}
msg, err = CreateWsMessage(typeString, msgData)
if err != nil {
err = errors.New("数据格式错误")
return
}
select {
case c.sent <- msg:
case <-c.closeChan:
err = errors.New("the sent channel is closed")
return
default:
err = errors.New("the sent channel is full")
}
return
}
func (c *Client) Dial(urlStr string) (err error) {
dial := websocket.DefaultDialer
dial.HandshakeTimeout = time.Second * 3
c.conn, _, err = dial.Dial(urlStr, nil)
return
}
//getHandlers ...
func (c *Client) getHandlers() map[string]ClientBusinessHandler {
c.mu.RLock()
hs := c.businessHandlers
c.mu.RUnlock()
return hs
}
func (c *Client) runReadHandle(ctx *ClientContext) {
ic := ctx.clone()
if handler, has := c.getHandlers()[ic.Message.StringType]; has {
inHandler := handler
inHandler(ic)
}
}
func (c *Client) writePump() {
var err error
defer func() {
if err != nil {
StdLogger.Printf("发送数据失败:%s\n", err.Error())
}
}()
for {
select {
case message, ok := <-c.sent:
_ = c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
//sent channel is closed
_ = c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
if message.MessageType != websocket.TextMessage {
continue
}
if err = c.conn.WriteMessage(websocket.TextMessage, message.Data); err != nil {
if websocket.IsUnexpectedCloseError(err, 1001, 1005, 1006) {
StdLogger.Printf("wirtePump error:%s\n", err.Error())
}
goto CLOSE
}
case <-c.closeChan:
return
}
}
CLOSE:
c.close()
}
func (c *Client) readPump() {
var err error
defer func() {
if err != nil {
StdLogger.Printf("读取数据失败:%s\n", err.Error())
}
}()
for {
var (
messageType int
messageData []byte
biMessage *BusinessMessage
)
messageType, messageData, err = c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, 1001, 1005, 1006) {
StdLogger.Printf("readPump error:%s\n", err.Error())
}
goto CLOSE
}
if messageType != websocket.TextMessage {
continue
}
messageData = bytes.TrimSpace(bytes.Replace(messageData, []byte{'\n'}, []byte{' '}, -1))
if biMessage, err = DecodeBiMessage(messageData); err != nil {
//读取到格式不正确的数据
StdLogger.Printf("读取到格式不正确的数据:%s\n", messageData)
continue
}
wsMsg := ws_rpc.NewMessage(biMessage.Data, c)
e := wsMsg.UnmarshalCallMsg()
if e != nil {
//不是一个call msg
go c.runReadHandle(&ClientContext{
Client: c,
Message: biMessage,
})
} else {
handler, ok := c.GetHandler(wsMsg.Msg().RequestID)
if !ok {
continue
}
handler.SetMsg(wsMsg.Msg())
handler.HasRead()
}
select {
case <-c.closeChan:
return
default:
}
}
CLOSE:
c.close()
}
func (c *Client) close() {
_ = c.conn.Close()
c.mu.Lock()
defer c.mu.Unlock()
if c.closed {
return
}
c.closed = true
close(c.closeChan)
close(c.sent)
}