/
btcmarkets_websocket.go
487 lines (449 loc) · 12.1 KB
/
btcmarkets_websocket.go
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package btcmarkets
import (
"context"
"encoding/json"
"errors"
"fmt"
"hash/crc32"
"net/http"
"strconv"
"strings"
"time"
"github.com/gorilla/websocket"
"github.com/thrasher-corp/gocryptotrader/common"
"github.com/thrasher-corp/gocryptotrader/common/crypto"
"github.com/thrasher-corp/gocryptotrader/currency"
"github.com/thrasher-corp/gocryptotrader/exchanges/asset"
"github.com/thrasher-corp/gocryptotrader/exchanges/order"
"github.com/thrasher-corp/gocryptotrader/exchanges/orderbook"
"github.com/thrasher-corp/gocryptotrader/exchanges/stream"
"github.com/thrasher-corp/gocryptotrader/exchanges/subscription"
"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
"github.com/thrasher-corp/gocryptotrader/exchanges/trade"
"github.com/thrasher-corp/gocryptotrader/log"
)
const (
btcMarketsWSURL = "wss://socket.btcmarkets.net/v2"
)
var (
errTypeAssertionFailure = errors.New("type assertion failure")
errChecksumFailure = errors.New("crc32 checksum failure")
authChannels = []string{fundChange, heartbeat, orderChange}
)
// WsConnect connects to a websocket feed
func (b *BTCMarkets) WsConnect() error {
if !b.Websocket.IsEnabled() || !b.IsEnabled() {
return stream.ErrWebsocketNotEnabled
}
var dialer websocket.Dialer
err := b.Websocket.Conn.Dial(&dialer, http.Header{})
if err != nil {
return err
}
if b.Verbose {
log.Debugf(log.ExchangeSys, "%s Connected to Websocket.\n", b.Name)
}
b.Websocket.Wg.Add(1)
go b.wsReadData()
return nil
}
// wsReadData receives and passes on websocket messages for processing
func (b *BTCMarkets) wsReadData() {
defer b.Websocket.Wg.Done()
for {
resp := b.Websocket.Conn.ReadMessage()
if resp.Raw == nil {
return
}
err := b.wsHandleData(resp.Raw)
if err != nil {
b.Websocket.DataHandler <- err
}
}
}
// UnmarshalJSON implements the unmarshaler interface.
func (w *WebsocketOrderbook) UnmarshalJSON(data []byte) error {
resp := make([][3]interface{}, len(data))
err := json.Unmarshal(data, &resp)
if err != nil {
return err
}
*w = WebsocketOrderbook(make(orderbook.Items, len(resp)))
for x := range resp {
sPrice, ok := resp[x][0].(string)
if !ok {
return fmt.Errorf("price string %w", errTypeAssertionFailure)
}
var price float64
price, err = strconv.ParseFloat(sPrice, 64)
if err != nil {
return err
}
sAmount, ok := resp[x][1].(string)
if !ok {
return fmt.Errorf("amount string %w", errTypeAssertionFailure)
}
var amount float64
amount, err = strconv.ParseFloat(sAmount, 64)
if err != nil {
return err
}
count, ok := resp[x][2].(float64)
if !ok {
return fmt.Errorf("count float64 %w", errTypeAssertionFailure)
}
(*w)[x] = orderbook.Item{
Amount: amount,
Price: price,
OrderCount: int64(count),
}
}
return nil
}
func (b *BTCMarkets) wsHandleData(respRaw []byte) error {
var wsResponse WsMessageType
err := json.Unmarshal(respRaw, &wsResponse)
if err != nil {
return err
}
switch wsResponse.MessageType {
case heartbeat:
if b.Verbose {
log.Debugf(log.ExchangeSys, "%v - Websocket heartbeat received %s", b.Name, respRaw)
}
case wsOB:
var ob WsOrderbook
err := json.Unmarshal(respRaw, &ob)
if err != nil {
return err
}
if ob.Snapshot {
err = b.Websocket.Orderbook.LoadSnapshot(&orderbook.Base{
Pair: ob.Currency,
Bids: orderbook.Items(ob.Bids),
Asks: orderbook.Items(ob.Asks),
LastUpdated: ob.Timestamp,
LastUpdateID: ob.SnapshotID,
Asset: asset.Spot,
Exchange: b.Name,
VerifyOrderbook: b.CanVerifyOrderbook,
})
} else {
err = b.Websocket.Orderbook.Update(&orderbook.Update{
UpdateTime: ob.Timestamp,
UpdateID: ob.SnapshotID,
Asset: asset.Spot,
Bids: orderbook.Items(ob.Bids),
Asks: orderbook.Items(ob.Asks),
Pair: ob.Currency,
Checksum: ob.Checksum,
})
}
if err != nil {
if errors.Is(err, orderbook.ErrOrderbookInvalid) {
err2 := b.ReSubscribeSpecificOrderbook(ob.Currency)
if err2 != nil {
return err2
}
}
return err
}
return nil
case tradeEndPoint:
if !b.IsSaveTradeDataEnabled() {
return nil
}
var t WsTrade
err := json.Unmarshal(respRaw, &t)
if err != nil {
return err
}
p, err := currency.NewPairFromString(t.Currency)
if err != nil {
return err
}
side := order.Buy
if t.Side == "Ask" {
side = order.Sell
}
return trade.AddTradesToBuffer(b.Name, trade.Data{
Timestamp: t.Timestamp,
CurrencyPair: p,
AssetType: asset.Spot,
Exchange: b.Name,
Price: t.Price,
Amount: t.Volume,
Side: side,
TID: strconv.FormatInt(t.TradeID, 10),
})
case tick:
var tick WsTick
err := json.Unmarshal(respRaw, &tick)
if err != nil {
return err
}
p, err := currency.NewPairFromString(tick.Currency)
if err != nil {
return err
}
b.Websocket.DataHandler <- &ticker.Price{
ExchangeName: b.Name,
Volume: tick.Volume,
High: tick.High24,
Low: tick.Low24h,
Bid: tick.Bid,
Ask: tick.Ask,
Last: tick.Last,
LastUpdated: tick.Timestamp,
AssetType: asset.Spot,
Pair: p,
}
case fundChange:
var transferData WsFundTransfer
err := json.Unmarshal(respRaw, &transferData)
if err != nil {
return err
}
b.Websocket.DataHandler <- transferData
case orderChange:
var orderData WsOrderChange
err := json.Unmarshal(respRaw, &orderData)
if err != nil {
return err
}
originalAmount := orderData.OpenVolume
var price float64
var trades []order.TradeHistory
var orderID = strconv.FormatInt(orderData.OrderID, 10)
for x := range orderData.Trades {
var isMaker bool
if orderData.Trades[x].LiquidityType == "Maker" {
isMaker = true
}
trades = append(trades, order.TradeHistory{
Price: orderData.Trades[x].Price,
Amount: orderData.Trades[x].Volume,
Fee: orderData.Trades[x].Fee,
Exchange: b.Name,
TID: strconv.FormatInt(orderData.Trades[x].TradeID, 10),
IsMaker: isMaker,
})
price = orderData.Trades[x].Price
originalAmount += orderData.Trades[x].Volume
}
oType, err := order.StringToOrderType(orderData.OrderType)
if err != nil {
b.Websocket.DataHandler <- order.ClassificationError{
Exchange: b.Name,
OrderID: orderID,
Err: err,
}
}
oSide, err := order.StringToOrderSide(orderData.Side)
if err != nil {
b.Websocket.DataHandler <- order.ClassificationError{
Exchange: b.Name,
OrderID: orderID,
Err: err,
}
}
oStatus, err := order.StringToOrderStatus(orderData.Status)
if err != nil {
b.Websocket.DataHandler <- order.ClassificationError{
Exchange: b.Name,
OrderID: orderID,
Err: err,
}
}
p, err := currency.NewPairFromString(orderData.MarketID)
if err != nil {
b.Websocket.DataHandler <- order.ClassificationError{
Exchange: b.Name,
OrderID: orderID,
Err: err,
}
}
creds, err := b.GetCredentials(context.TODO())
if err != nil {
b.Websocket.DataHandler <- order.ClassificationError{
Exchange: b.Name,
OrderID: orderID,
Err: err,
}
}
b.Websocket.DataHandler <- &order.Detail{
Price: price,
Amount: originalAmount,
RemainingAmount: orderData.OpenVolume,
Exchange: b.Name,
OrderID: orderID,
ClientID: creds.ClientID,
Type: oType,
Side: oSide,
Status: oStatus,
AssetType: asset.Spot,
Date: orderData.Timestamp,
Trades: trades,
Pair: p,
}
case "error":
var wsErr WsError
err := json.Unmarshal(respRaw, &wsErr)
if err != nil {
return err
}
return fmt.Errorf("%v websocket error. Code: %v Message: %v", b.Name, wsErr.Code, wsErr.Message)
default:
b.Websocket.DataHandler <- stream.UnhandledMessageWarning{Message: b.Name + stream.UnhandledMessage + string(respRaw)}
return nil
}
return nil
}
func (b *BTCMarkets) generateDefaultSubscriptions() ([]subscription.Subscription, error) {
var channels = []string{wsOB, tick, tradeEndPoint}
enabledCurrencies, err := b.GetEnabledPairs(asset.Spot)
if err != nil {
return nil, err
}
var subscriptions []subscription.Subscription
for i := range channels {
for j := range enabledCurrencies {
subscriptions = append(subscriptions, subscription.Subscription{
Channel: channels[i],
Pair: enabledCurrencies[j],
Asset: asset.Spot,
})
}
}
if b.Websocket.CanUseAuthenticatedEndpoints() {
for i := range authChannels {
subscriptions = append(subscriptions, subscription.Subscription{
Channel: authChannels[i],
})
}
}
return subscriptions, nil
}
// Subscribe sends a websocket message to receive data from the channel
func (b *BTCMarkets) Subscribe(subs []subscription.Subscription) error {
var payload WsSubscribe
if len(subs) > 1 {
// TODO: Expand this to stream package as this assumes that we are doing
// an initial sync.
payload.MessageType = subscribe
} else {
payload.MessageType = addSubscription
payload.ClientType = clientType
}
var authenticate bool
for i := range subs {
if !authenticate && common.StringDataContains(authChannels, subs[i].Channel) {
authenticate = true
}
payload.Channels = append(payload.Channels, subs[i].Channel)
if subs[i].Pair.IsEmpty() {
continue
}
pair := subs[i].Pair.String()
if common.StringDataCompare(payload.MarketIDs, pair) {
continue
}
payload.MarketIDs = append(payload.MarketIDs, pair)
}
if authenticate {
creds, err := b.GetCredentials(context.TODO())
if err != nil {
return err
}
signTime := strconv.FormatInt(time.Now().UnixMilli(), 10)
strToSign := "/users/self/subscribe" + "\n" + signTime
var tempSign []byte
tempSign, err = crypto.GetHMAC(crypto.HashSHA512,
[]byte(strToSign),
[]byte(creds.Secret))
if err != nil {
return err
}
sign := crypto.Base64Encode(tempSign)
payload.Key = creds.Key
payload.Signature = sign
payload.Timestamp = signTime
}
if err := b.Websocket.Conn.SendJSONMessage(payload); err != nil {
return err
}
b.Websocket.AddSuccessfulSubscriptions(subs...)
return nil
}
// Unsubscribe sends a websocket message to manage and remove a subscription.
func (b *BTCMarkets) Unsubscribe(subs []subscription.Subscription) error {
payload := WsSubscribe{
MessageType: removeSubscription,
ClientType: clientType,
}
for i := range subs {
payload.Channels = append(payload.Channels, subs[i].Channel)
if subs[i].Pair.IsEmpty() {
continue
}
pair := subs[i].Pair.String()
if common.StringDataCompare(payload.MarketIDs, pair) {
continue
}
payload.MarketIDs = append(payload.MarketIDs, pair)
}
err := b.Websocket.Conn.SendJSONMessage(payload)
if err != nil {
return err
}
b.Websocket.RemoveSubscriptions(subs...)
return nil
}
// ReSubscribeSpecificOrderbook removes the subscription and the subscribes
// again to fetch a new snapshot in the event of a de-sync event.
func (b *BTCMarkets) ReSubscribeSpecificOrderbook(pair currency.Pair) error {
sub := []subscription.Subscription{{
Channel: wsOB,
Pair: pair,
Asset: asset.Spot,
}}
if err := b.Unsubscribe(sub); err != nil {
return err
}
return b.Subscribe(sub)
}
// checksum provides assurance on current in memory liquidity
func checksum(ob *orderbook.Base, checksum uint32) error {
check := crc32.ChecksumIEEE([]byte(concat(ob.Bids) + concat(ob.Asks)))
if check != checksum {
return fmt.Errorf("%s %s %s ID: %v expected: %v but received: %v %w",
ob.Exchange,
ob.Pair,
ob.Asset,
ob.LastUpdateID,
checksum,
check,
errChecksumFailure)
}
return nil
}
// concat concatenates price and amounts together for checksum processing
func concat(liquidity orderbook.Items) string {
length := 10
if len(liquidity) < 10 {
length = len(liquidity)
}
var c string
for x := 0; x < length; x++ {
c += trim(liquidity[x].Price) + trim(liquidity[x].Amount)
}
return c
}
// trim turns value into string, removes the decimal point and all the leading
// zeros.
func trim(value float64) string {
valstr := strconv.FormatFloat(value, 'f', -1, 64)
valstr = strings.ReplaceAll(valstr, ".", "")
valstr = strings.TrimLeft(valstr, "0")
return valstr
}