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stream.go
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stream.go
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package ftx
import (
"context"
"fmt"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
"github.com/c9s/bbgo/pkg/service"
"github.com/c9s/bbgo/pkg/types"
)
const endpoint = "wss://ftx.com/ws/"
type Stream struct {
*types.StandardStream
ws *service.WebsocketClientBase
exchange *Exchange
// publicOnly can only be configured before connecting
publicOnly int32
key string
secret string
subAccount string
// subscriptions are only accessed in single goroutine environment, so I don't use mutex to protect them
subscriptions []websocketRequest
klineSubscriptions []klineSubscription
}
type klineSubscription struct {
symbol string
interval types.Interval
}
func NewStream(key, secret string, subAccount string, e *Exchange) *Stream {
s := &Stream{
exchange: e,
key: key,
secret: secret,
subAccount: subAccount,
StandardStream: &types.StandardStream{},
ws: service.NewWebsocketClientBase(endpoint, 3*time.Second),
}
s.ws.OnMessage((&messageHandler{StandardStream: s.StandardStream}).handleMessage)
s.ws.OnConnected(func(conn *websocket.Conn) {
subs := []websocketRequest{newLoginRequest(s.key, s.secret, time.Now(), s.subAccount)}
subs = append(subs, s.subscriptions...)
for _, sub := range subs {
if err := conn.WriteJSON(sub); err != nil {
s.ws.EmitError(fmt.Errorf("failed to send subscription: %+v", sub))
}
}
s.EmitConnect()
})
return s
}
func (s *Stream) Connect(ctx context.Context) error {
// If it's not public only, let's do the authentication.
if atomic.LoadInt32(&s.publicOnly) == 0 {
s.subscribePrivateEvents()
}
if err := s.ws.Connect(ctx); err != nil {
return err
}
s.EmitStart()
go s.pollKLines(ctx)
go func() {
// https://docs.ftx.com/?javascript#request-process
tk := time.NewTicker(15 * time.Second)
defer tk.Stop()
for {
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
logger.WithError(err).Errorf("websocket ping goroutine is terminated")
}
case <-tk.C:
if err := s.ws.Conn().WriteJSON(websocketRequest{
Operation: ping,
}); err != nil {
logger.WithError(err).Warnf("failed to ping, try in next tick")
}
}
}
}()
return nil
}
func (s *Stream) subscribePrivateEvents() {
s.addSubscription(websocketRequest{
Operation: subscribe,
Channel: privateOrdersChannel,
})
s.addSubscription(websocketRequest{
Operation: subscribe,
Channel: privateTradesChannel,
})
}
func (s *Stream) addSubscription(request websocketRequest) {
s.subscriptions = append(s.subscriptions, request)
}
func (s *Stream) SetPublicOnly() {
atomic.StoreInt32(&s.publicOnly, 1)
}
func (s *Stream) Subscribe(channel types.Channel, symbol string, option types.SubscribeOptions) {
if channel == types.BookChannel {
s.addSubscription(websocketRequest{
Operation: subscribe,
Channel: orderBookChannel,
Market: toLocalSymbol(TrimUpperString(symbol)),
})
} else if channel == types.KLineChannel {
// FTX does not support kline channel, do polling
interval := types.Interval(option.Interval)
ks := klineSubscription{symbol: symbol, interval: interval}
s.klineSubscriptions = append(s.klineSubscriptions, ks)
} else {
panic("only support book/kline channel now")
}
}
func (s *Stream) pollKLines(ctx context.Context) {
// get current kline candle
for _, sub := range s.klineSubscriptions {
klines := getLastKLine(s.exchange, ctx, sub.symbol, sub.interval)
if len(klines) > 0 {
// handle mutiple klines, get the latest one
s.EmitKLineClosed(klines[len(klines)-1])
}
}
// the highest resolution of kline is 1min
ticker := time.NewTicker(time.Minute)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
logger.WithError(err).Errorf("pollKLines goroutine is terminated")
}
return
case <-ticker.C:
now := time.Now().Truncate(time.Minute)
for _, sub := range s.klineSubscriptions {
subTime := now.Truncate(sub.interval.Duration())
if now != subTime {
// not in the checking time slot, check next subscription
continue
}
klines := getLastKLine(s.exchange, ctx, sub.symbol, sub.interval)
if len(klines) > 0 {
// handle mutiple klines, get the latest one
s.EmitKLineClosed(klines[len(klines)-1])
}
}
}
}
}
func getLastKLine(e *Exchange, ctx context.Context, symbol string, interval types.Interval) []types.KLine {
// set since to more 30s ago to avoid getting no kline candle
since := time.Now().Add(time.Duration(-1*(interval.Minutes()*60+30)) * time.Second)
klines, err := e.QueryKLines(ctx, symbol, interval, types.KLineQueryOptions{
StartTime: &since,
})
if err != nil {
logger.WithError(err).Errorf("failed to get kline data")
return klines
}
return klines
}
func (s *Stream) Close() error {
s.subscriptions = nil
if s.ws != nil {
return s.ws.Conn().Close()
}
return nil
}