/
websocket_connection.go
314 lines (285 loc) · 7.46 KB
/
websocket_connection.go
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package stream
import (
"bytes"
"compress/flate"
"compress/gzip"
"crypto/rand"
"fmt"
"io/ioutil"
"math/big"
"net"
"net/http"
"net/url"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
"github.com/thrasher-corp/gocryptotrader/log"
)
// SendMessageReturnResponse will send a WS message to the connection and wait
// for response
func (w *WebsocketConnection) SendMessageReturnResponse(signature, request interface{}) ([]byte, error) {
m, err := w.Match.set(signature)
if err != nil {
return nil, err
}
defer m.Cleanup()
err = w.SendJSONMessage(request)
if err != nil {
return nil, err
}
timer := time.NewTimer(w.ResponseMaxLimit)
select {
case payload := <-m.C:
return payload, nil
case <-timer.C:
timer.Stop()
return nil, fmt.Errorf("%s websocket connection: timeout waiting for response with signature: %v",
w.ExchangeName,
signature)
}
}
// Dial sets proxy urls and then connects to the websocket
func (w *WebsocketConnection) Dial(dialer *websocket.Dialer, headers http.Header) error {
if w.ProxyURL != "" {
proxy, err := url.Parse(w.ProxyURL)
if err != nil {
return err
}
dialer.Proxy = http.ProxyURL(proxy)
}
var err error
var conStatus *http.Response
w.Connection, conStatus, err = dialer.Dial(w.URL, headers)
if err != nil {
if conStatus != nil {
return fmt.Errorf("%s websocket connection: %v %v %v Error: %v",
w.ExchangeName,
w.URL,
conStatus,
conStatus.StatusCode,
err)
}
return fmt.Errorf("%s websocket connection: %v Error: %v",
w.ExchangeName,
w.URL,
err)
}
defer conStatus.Body.Close()
if w.Verbose {
log.Infof(log.WebsocketMgr,
"%v Websocket connected to %s\n",
w.ExchangeName,
w.URL)
}
select {
case w.Traffic <- struct{}{}:
default:
}
w.setConnectedStatus(true)
return nil
}
// SendJSONMessage sends a JSON encoded message over the connection
func (w *WebsocketConnection) SendJSONMessage(data interface{}) error {
if !w.IsConnected() {
return fmt.Errorf("%s websocket connection: cannot send message to a disconnected websocket",
w.ExchangeName)
}
w.writeControl.Lock()
defer w.writeControl.Unlock()
if w.Verbose {
log.Debugf(log.WebsocketMgr,
"%s websocket connection: sending message to websocket %+v\n",
w.ExchangeName,
data)
}
if w.RateLimit > 0 {
time.Sleep(time.Duration(w.RateLimit) * time.Millisecond)
if !w.IsConnected() {
return fmt.Errorf("%v websocket connection: cannot send message to a disconnected websocket",
w.ExchangeName)
}
}
return w.Connection.WriteJSON(data)
}
// SendRawMessage sends a message over the connection without JSON encoding it
func (w *WebsocketConnection) SendRawMessage(messageType int, message []byte) error {
if !w.IsConnected() {
return fmt.Errorf("%v websocket connection: cannot send message to a disconnected websocket",
w.ExchangeName)
}
w.writeControl.Lock()
defer w.writeControl.Unlock()
if w.Verbose {
log.Debugf(log.WebsocketMgr,
"%v websocket connection: sending message [%s]\n",
w.ExchangeName,
message)
}
if w.RateLimit > 0 {
time.Sleep(time.Duration(w.RateLimit) * time.Millisecond)
if !w.IsConnected() {
return fmt.Errorf("%v websocket connection: cannot send message to a disconnected websocket",
w.ExchangeName)
}
}
if !w.IsConnected() {
return fmt.Errorf("%v websocket connection: cannot send message to a disconnected websocket",
w.ExchangeName)
}
return w.Connection.WriteMessage(messageType, message)
}
// SetupPingHandler will automatically send ping or pong messages based on
// WebsocketPingHandler configuration
func (w *WebsocketConnection) SetupPingHandler(handler PingHandler) {
if handler.UseGorillaHandler {
h := func(msg string) error {
err := w.Connection.WriteControl(handler.MessageType,
[]byte(msg),
time.Now().Add(handler.Delay))
if err == websocket.ErrCloseSent {
return nil
} else if e, ok := err.(net.Error); ok && e.Temporary() {
return nil
}
return err
}
w.Connection.SetPingHandler(h)
return
}
w.Wg.Add(1)
defer w.Wg.Done()
go func() {
ticker := time.NewTicker(handler.Delay)
for {
select {
case <-w.ShutdownC:
ticker.Stop()
return
case <-ticker.C:
err := w.SendRawMessage(handler.MessageType, handler.Message)
if err != nil {
log.Errorf(log.WebsocketMgr,
"%v websocket connection: ping handler failed to send message [%s]",
w.ExchangeName,
handler.Message)
return
}
}
}
}()
}
func (w *WebsocketConnection) setConnectedStatus(b bool) {
if b {
atomic.StoreInt32(&w.connected, 1)
return
}
atomic.StoreInt32(&w.connected, 0)
}
// IsConnected exposes websocket connection status
func (w *WebsocketConnection) IsConnected() bool {
return atomic.LoadInt32(&w.connected) == 1
}
// ReadMessage reads messages, can handle text, gzip and binary
func (w *WebsocketConnection) ReadMessage() Response {
mType, resp, err := w.Connection.ReadMessage()
if err != nil {
if isDisconnectionError(err) {
w.setConnectedStatus(false)
w.readMessageErrors <- err
}
return Response{}
}
select {
case w.Traffic <- struct{}{}:
default: // causes contention, just bypass if there is no receiver.
}
var standardMessage []byte
switch mType {
case websocket.TextMessage:
standardMessage = resp
case websocket.BinaryMessage:
standardMessage, err = w.parseBinaryResponse(resp)
if err != nil {
log.Errorf(log.WebsocketMgr,
"%v websocket connection: parseBinaryResponse error: %v",
w.ExchangeName,
err)
return Response{}
}
}
if w.Verbose {
log.Debugf(log.WebsocketMgr,
"%v websocket connection: message received: %v",
w.ExchangeName,
string(standardMessage))
}
return Response{Raw: standardMessage, Type: mType}
}
// parseBinaryResponse parses a websocket binary response into a usable byte array
func (w *WebsocketConnection) parseBinaryResponse(resp []byte) ([]byte, error) {
var standardMessage []byte
var err error
// Detect GZIP
if resp[0] == 31 && resp[1] == 139 {
b := bytes.NewReader(resp)
var gReader *gzip.Reader
gReader, err = gzip.NewReader(b)
if err != nil {
return standardMessage, err
}
standardMessage, err = ioutil.ReadAll(gReader)
if err != nil {
return standardMessage, err
}
err = gReader.Close()
if err != nil {
return standardMessage, err
}
} else {
reader := flate.NewReader(bytes.NewReader(resp))
standardMessage, err = ioutil.ReadAll(reader)
if err != nil {
return standardMessage, err
}
err = reader.Close()
if err != nil {
return standardMessage, err
}
}
return standardMessage, nil
}
// GenerateMessageID Creates a messageID to checkout
func (w *WebsocketConnection) GenerateMessageID(highPrec bool) int64 {
var min int64 = 1e8
var max int64 = 2e8
if highPrec {
max = 2e12
min = 1e12
}
// utlization of hard coded positive numbers and default crypto/rand
// io.reader will panic on error instead of returning
randomNumber, err := rand.Int(rand.Reader, big.NewInt(max-min+1))
if err != nil {
panic(err)
}
return randomNumber.Int64() + min
}
// Shutdown shuts down and closes specific connection
func (w *WebsocketConnection) Shutdown() error {
if w == nil || w.Connection == nil {
return nil
}
return w.Connection.UnderlyingConn().Close()
}
// SetURL sets connection URL
func (w *WebsocketConnection) SetURL(url string) {
w.URL = url
}
// SetProxy sets connection proxy
func (w *WebsocketConnection) SetProxy(proxy string) {
w.ProxyURL = proxy
}
// GetURL returns the connection URL
func (w *WebsocketConnection) GetURL() string {
return w.URL
}