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parse.go
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parse.go
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package okex
import (
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/valyala/fastjson"
"github.com/c9s/bbgo/pkg/exchange/okex/okexapi"
"github.com/c9s/bbgo/pkg/fixedpoint"
"github.com/c9s/bbgo/pkg/types"
)
func parseWebSocketEvent(str []byte) (interface{}, error) {
v, err := fastjson.ParseBytes(str)
if err != nil {
return nil, err
}
if v.Exists("event") {
return parseEvent(v)
}
if v.Exists("data") {
return parseData(v)
}
return nil, nil
}
type WebSocketEvent struct {
Event string `json:"event"`
Code string `json:"code,omitempty"`
Message string `json:"msg,omitempty"`
Arg interface{} `json:"arg,omitempty"`
}
func parseEvent(v *fastjson.Value) (*WebSocketEvent, error) {
// event could be "subscribe", "unsubscribe" or "error"
event := string(v.GetStringBytes("event"))
code := string(v.GetStringBytes("code"))
message := string(v.GetStringBytes("msg"))
arg := v.GetObject("arg")
return &WebSocketEvent{
Event: event,
Code: code,
Message: message,
Arg: arg,
}, nil
}
type BookEvent struct {
InstrumentID string
Symbol string
Action string
Bids []BookEntry
Asks []BookEntry
MillisecondTimestamp int64
Checksum int
channel string
}
func (data *BookEvent) BookTicker() types.BookTicker {
var askBookData BookEntry = data.Asks[0]
var bidBookData BookEntry = data.Bids[0]
return types.BookTicker{
Symbol: data.Symbol,
Buy: bidBookData.Price,
BuySize: bidBookData.Price,
Sell: askBookData.Price,
SellSize: askBookData.Volume,
}
}
func (data *BookEvent) Book() types.SliceOrderBook {
book := types.SliceOrderBook{
Symbol: data.Symbol,
}
for _, bid := range data.Bids {
book.Bids = append(book.Bids, types.PriceVolume{Price: bid.Price, Volume: bid.Volume})
}
for _, ask := range data.Asks {
book.Asks = append(book.Asks, types.PriceVolume{Price: ask.Price, Volume: ask.Volume})
}
return book
}
type BookEntry struct {
Price fixedpoint.Value
Volume fixedpoint.Value
NumLiquidated int
NumOrders int
}
func parseBookEntry(v *fastjson.Value) (*BookEntry, error) {
arr, err := v.Array()
if err != nil {
return nil, err
}
if len(arr) < 4 {
return nil, fmt.Errorf("unexpected book entry size: %d", len(arr))
}
price := fixedpoint.Must(fixedpoint.NewFromString(string(arr[0].GetStringBytes())))
volume := fixedpoint.Must(fixedpoint.NewFromString(string(arr[1].GetStringBytes())))
numLiquidated, err := strconv.Atoi(string(arr[2].GetStringBytes()))
if err != nil {
return nil, err
}
numOrders, err := strconv.Atoi(string(arr[3].GetStringBytes()))
if err != nil {
return nil, err
}
return &BookEntry{
Price: price,
Volume: volume,
NumLiquidated: numLiquidated,
NumOrders: numOrders,
}, nil
}
func parseBookData(v *fastjson.Value) (*BookEvent, error) {
instrumentId := string(v.GetStringBytes("arg", "instId"))
data := v.GetArray("data")
if len(data) == 0 {
return nil, errors.New("empty data payload")
}
// "snapshot" or "update"
action := string(v.GetStringBytes("action"))
millisecondTimestamp, err := strconv.ParseInt(string(data[0].GetStringBytes("ts")), 10, 64)
if err != nil {
return nil, err
}
checksum := data[0].GetInt("checksum")
var asks []BookEntry
var bids []BookEntry
for _, v := range data[0].GetArray("asks") {
entry, err := parseBookEntry(v)
if err != nil {
return nil, err
}
asks = append(asks, *entry)
}
for _, v := range data[0].GetArray("bids") {
entry, err := parseBookEntry(v)
if err != nil {
return nil, err
}
bids = append(bids, *entry)
}
return &BookEvent{
InstrumentID: instrumentId,
Symbol: toGlobalSymbol(instrumentId),
Action: action,
Bids: bids,
Asks: asks,
Checksum: checksum,
MillisecondTimestamp: millisecondTimestamp,
}, nil
}
type Candle struct {
Channel string
InstrumentID string
Symbol string
Interval string
Open fixedpoint.Value
High fixedpoint.Value
Low fixedpoint.Value
Close fixedpoint.Value
// Trading volume, with a unit of contact.
// If it is a derivatives contract, the value is the number of contracts.
// If it is SPOT/MARGIN, the value is the amount of trading currency.
Volume fixedpoint.Value
// Trading volume, with a unit of currency.
// If it is a derivatives contract, the value is the number of settlement currency.
// If it is SPOT/MARGIN, the value is the number of quote currency.
VolumeInCurrency fixedpoint.Value
MillisecondTimestamp int64
StartTime time.Time
}
func (c *Candle) KLine() types.KLine {
interval := types.Interval(c.Interval)
endTime := c.StartTime.Add(interval.Duration() - 1*time.Millisecond)
return types.KLine{
Exchange: types.ExchangeOKEx,
Interval: interval,
Open: c.Open,
High: c.High,
Low: c.Low,
Close: c.Close,
Volume: c.Volume,
QuoteVolume: c.VolumeInCurrency,
StartTime: types.Time(c.StartTime),
EndTime: types.Time(endTime),
}
}
func parseCandle(channel string, v *fastjson.Value) (*Candle, error) {
instrumentID := string(v.GetStringBytes("arg", "instId"))
data, err := v.Get("data").Array()
if err != nil {
return nil, err
}
if len(data) == 0 {
return nil, errors.New("candle data is empty")
}
arr, err := data[0].Array()
if err != nil {
return nil, err
}
if len(arr) < 7 {
return nil, fmt.Errorf("unexpected candle data length: %d", len(arr))
}
interval := strings.ToLower(strings.TrimPrefix(channel, "candle"))
timestamp, err := strconv.ParseInt(string(arr[0].GetStringBytes()), 10, 64)
if err != nil {
return nil, err
}
open, err := fixedpoint.NewFromString(string(arr[1].GetStringBytes()))
if err != nil {
return nil, err
}
high, err := fixedpoint.NewFromString(string(arr[2].GetStringBytes()))
if err != nil {
return nil, err
}
low, err := fixedpoint.NewFromString(string(arr[3].GetStringBytes()))
if err != nil {
return nil, err
}
cls, err := fixedpoint.NewFromString(string(arr[4].GetStringBytes()))
if err != nil {
return nil, err
}
vol, err := fixedpoint.NewFromString(string(arr[5].GetStringBytes()))
if err != nil {
return nil, err
}
volCurrency, err := fixedpoint.NewFromString(string(arr[6].GetStringBytes()))
if err != nil {
return nil, err
}
candleTime := time.Unix(0, timestamp*int64(time.Millisecond))
return &Candle{
Channel: channel,
InstrumentID: instrumentID,
Symbol: toGlobalSymbol(instrumentID),
Interval: interval,
Open: open,
High: high,
Low: low,
Close: cls,
Volume: vol,
VolumeInCurrency: volCurrency,
MillisecondTimestamp: timestamp,
StartTime: candleTime,
}, nil
}
func parseAccount(v *fastjson.Value) (*okexapi.Account, error) {
data := v.Get("data").MarshalTo(nil)
var accounts []okexapi.Account
err := json.Unmarshal(data, &accounts)
if err != nil {
return nil, err
}
if len(accounts) == 0 {
return nil, errors.New("empty account data")
}
return &accounts[0], nil
}
func parseOrder(v *fastjson.Value) ([]okexapi.OrderDetails, error) {
data := v.Get("data").MarshalTo(nil)
var orderDetails []okexapi.OrderDetails
err := json.Unmarshal(data, &orderDetails)
if err != nil {
return nil, err
}
return orderDetails, nil
}
func parseData(v *fastjson.Value) (interface{}, error) {
channel := string(v.GetStringBytes("arg", "channel"))
switch channel {
case "books5":
data, err := parseBookData(v)
data.channel = channel
return data, err
case "books":
data, err := parseBookData(v)
data.channel = channel
return data, err
case "account":
return parseAccount(v)
case "orders":
return parseOrder(v)
default:
if strings.HasPrefix(channel, "candle") {
data, err := parseCandle(channel, v)
return data, err
}
}
return nil, nil
}