/
websocket_client.go
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/
websocket_client.go
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/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* hprose/websocket_client.go *
* *
* hprose websocket client for Go. *
* *
* LastModified: May 28, 2015 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package hprose
import (
"crypto/tls"
"net/http"
"net/url"
"sync"
"github.com/gorilla/websocket"
)
// WebSocketClient is hprose websocket client
type WebSocketClient struct {
*BaseClient
}
type receiveMessage struct {
data []byte
err error
}
type webSocketTransporter struct {
dialer *websocket.Dialer
conn *websocket.Conn
header *http.Header
mutex sync.Mutex
maxConcurrentRequests int
id chan uint32
sendIDs chan uint32
sendMsgs map[uint32][]byte
recvMsgs map[uint32](chan receiveMessage)
}
// NewWebSocketClient is the constructor of WebSocketClient
func NewWebSocketClient(uri string) (client *WebSocketClient) {
client = new(WebSocketClient)
transporter := new(webSocketTransporter)
transporter.dialer = new(websocket.Dialer)
transporter.header = new(http.Header)
transporter.maxConcurrentRequests = 10
client.BaseClient = NewBaseClient(transporter)
client.Client = client
client.SetUri(uri)
return
}
func newWebSocketClient(uri string) Client {
return NewWebSocketClient(uri)
}
// Close the client
func (client *WebSocketClient) Close() {
trans := client.Transporter.(*webSocketTransporter)
if trans.conn != nil {
trans.conn.Close()
trans.conn = nil
}
}
// SetUri set the uri of hprose client
func (client *WebSocketClient) SetUri(uri string) {
if u, err := url.Parse(uri); err == nil {
if u.Scheme != "ws" && u.Scheme != "wss" {
panic("This client desn't support " + u.Scheme + " scheme.")
}
if u.Scheme == "wss" {
config := new(tls.Config)
config.InsecureSkipVerify = true
client.SetTLSClientConfig(config)
}
}
client.BaseClient.SetUri(uri)
}
func (client *WebSocketClient) trans() *webSocketTransporter {
return client.Transporter.(*webSocketTransporter)
}
func (client *WebSocketClient) dialer() *websocket.Dialer {
return client.trans().dialer
}
// Header returns the http.Header in hprose client
func (client *WebSocketClient) Header() *http.Header {
return client.trans().header
}
// TLSClientConfig returns the tls.Config in hprose client
func (client *WebSocketClient) TLSClientConfig() *tls.Config {
return client.dialer().TLSClientConfig
}
// SetTLSClientConfig sets the tls.Config
func (client *WebSocketClient) SetTLSClientConfig(config *tls.Config) {
client.dialer().TLSClientConfig = config
}
// SetKeepAlive do nothing on WebSocketClient, it is always keepAlive
func (client *WebSocketClient) SetKeepAlive(enable bool) {
}
// MaxConcurrentRequests returns the max concurrent requests of hprose client
func (client *WebSocketClient) MaxConcurrentRequests() int {
return client.trans().maxConcurrentRequests
}
// SetMaxConcurrentRequests sets the max concurrent requests of hprose client
func (client *WebSocketClient) SetMaxConcurrentRequests(value int) {
client.trans().maxConcurrentRequests = value
}
func (trans *webSocketTransporter) idGen() {
defer func() {
close(trans.id)
trans.id = nil
}()
var i uint32
for {
if trans.conn == nil {
break
}
trans.id <- i
i++
}
}
func (trans *webSocketTransporter) sendLoop() {
defer func() {
close(trans.sendIDs)
trans.sendIDs = nil
trans.sendMsgs = nil
}()
for {
if trans.conn == nil {
break
}
id := <-trans.sendIDs
msg := trans.sendMsgs[id]
delete(trans.sendMsgs, id)
err := trans.conn.WriteMessage(websocket.BinaryMessage, msg)
if err != nil {
trans.conn.Close()
trans.conn = nil
recvMsg := trans.recvMsgs[id]
delete(trans.recvMsgs, id)
recvMsg <- receiveMessage{nil, err}
close(recvMsg)
}
}
}
func (trans *webSocketTransporter) recvLoop() {
var msgType int
var data []byte
var err error
defer func() {
for _, recvMsg := range trans.recvMsgs {
recvMsg <- receiveMessage{nil, err}
close(recvMsg)
}
trans.recvMsgs = nil
}()
for {
if trans.conn == nil {
break
}
msgType, data, err = trans.conn.ReadMessage()
if err != nil {
trans.conn.Close()
trans.conn = nil
break
}
if msgType == websocket.BinaryMessage {
id := (uint32(data[0])<<24 |
uint32(data[1])<<16 |
uint32(data[2])<<8 |
uint32(data[3]))
recvMsg := trans.recvMsgs[id]
delete(trans.recvMsgs, id)
recvMsg <- receiveMessage{data[4:], nil}
close(recvMsg)
}
}
}
func (trans *webSocketTransporter) getConn(uri string) (err error) {
trans.mutex.Lock()
defer trans.mutex.Unlock()
if trans.conn == nil {
trans.conn, _, err = trans.dialer.Dial(uri, *trans.header)
if err != nil {
return err
}
trans.id = make(chan uint32)
trans.sendIDs = make(chan uint32, trans.maxConcurrentRequests)
trans.sendMsgs = make(map[uint32][]byte, trans.maxConcurrentRequests)
trans.recvMsgs = make(map[uint32](chan receiveMessage), trans.maxConcurrentRequests)
go trans.idGen()
go trans.sendLoop()
go trans.recvLoop()
}
return nil
}
// SendAndReceive send and receive the data
func (trans *webSocketTransporter) SendAndReceive(uri string, data []byte) ([]byte, error) {
if err := trans.getConn(uri); err != nil {
return nil, err
}
id := <-trans.id
msg := make([]byte, len(data)+4)
msg[0] = byte((id >> 24) & 0xff)
msg[1] = byte((id >> 16) & 0xff)
msg[2] = byte((id >> 8) & 0xff)
msg[3] = byte(id & 0xff)
copy(msg[4:], data)
recvMsg := make(chan receiveMessage)
trans.recvMsgs[id] = recvMsg
trans.sendMsgs[id] = msg
trans.sendIDs <- id
result := <-recvMsg
return result.data, result.err
}