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websocket.go
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websocket.go
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package quotes
import (
"context"
"net/http"
"sync"
"github.com/gorilla/websocket"
"golang.org/x/time/rate"
)
type wsTransport interface {
IsConnected() bool
ReadMessage() (messageType int, p []byte, err error)
WriteMessage(messageType int, data []byte) error
Close() error
}
type wsDialer interface {
Dial(url string, header http.Header) (wsTransport, *http.Response, error)
}
type wsDialWrapper struct {
rps int
}
func (w *wsDialWrapper) WithRateLimit(rps int) {
w.rps = rps
}
func (w *wsDialWrapper) Dial(url string, header http.Header) (wsTransport, *http.Response, error) {
conn, resp, err := websocket.DefaultDialer.Dial(url, header)
if err != nil {
return nil, resp, err
}
connWrapper := &wsConn{
conn: conn,
limiter: rate.NewLimiter(rate.Limit(w.rps), w.rps),
}
return connWrapper, resp, err
}
type wsConn struct {
conn *websocket.Conn
mu sync.RWMutex
limiter *rate.Limiter
}
func (w *wsConn) IsConnected() bool {
w.mu.RLock()
defer w.mu.RUnlock()
return w.conn != nil
}
func (w *wsConn) ReadMessage() (messageType int, p []byte, err error) {
w.mu.RLock()
defer w.mu.RUnlock()
return w.conn.ReadMessage()
}
func (w *wsConn) WriteMessage(messageType int, data []byte) error {
if w.limiter != nil {
// Wait until the limiter allows sending a message
ctx := context.Background()
if err := w.limiter.Wait(ctx); err != nil {
return err
}
}
w.mu.RLock()
defer w.mu.RUnlock()
return w.conn.WriteMessage(messageType, data)
}
func (w *wsConn) Close() error {
w.mu.Lock()
defer w.mu.Unlock()
return w.conn.Close()
}