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connect.go
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connect.go
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package jsonrpc
import (
"bytes"
"context"
"fmt"
"log"
"os"
"runtime"
"strings"
"time"
"github.com/buger/jsonparser"
"golang.org/x/sync/errgroup"
"github.com/go-numb/go-exchanges/api/bitflyer/v1/public/board"
"github.com/go-numb/go-exchanges/api/bitflyer/v1/public/execution"
"github.com/go-numb/go-exchanges/api/bitflyer/v1/public/ticker"
"github.com/go-numb/go-exchanges/api/bitflyer/v1/types"
"github.com/gorilla/websocket"
jsoniter "github.com/json-iterator/go"
)
const (
ENDPOINT = "wss://ws.lightstream.bitflyer.com/json-rpc"
READDEADLINE time.Duration = 300 * time.Second
)
type Types int
const (
All Types = iota
Ticker
Executions
Board
ChildOrders
ParentOrders
Undefined
Error
)
func (p Types) String() string {
switch p {
case All:
return "ALL"
case Ticker:
return "ticker"
case Executions:
return "executions"
case Board:
return "board"
case ChildOrders:
return "childorders"
case ParentOrders:
return "parentorders"
case Error:
return "error"
}
return "undefined"
}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
type Client struct {
conn *websocket.Conn
log *log.Logger
}
func New(l *log.Logger) *Client {
if l == nil {
l = log.New(os.Stdout, "websocket jsonrpc", log.Lmicroseconds)
}
conn, _, err := websocket.DefaultDialer.Dial(ENDPOINT, nil)
if err != nil {
return nil
}
return &Client{
conn: conn,
log: l,
}
}
func (p *Client) Close() error {
if err := p.conn.Close(); err != nil {
p.log.Println(err)
return err
}
return nil
}
type Request struct {
Jsonrpc string `json:"jsonrpc,omitempty"`
Method string `json:"method"`
Params map[string]interface{} `json:"params"`
ID int `json:"id,omitempty"`
}
type Response struct {
Types Types
ProductCode types.ProductCode
Board board.Response
Ticker ticker.Response
Executions []execution.Execution
ChildOrderEvents []ChildOrderEvent
ParentOrderEvents []ParentEvent
Results error
}
func Connect(ctx context.Context, ch chan Response, channels, symbols []string, l *log.Logger) error {
c := New(l)
defer c.Close()
RECONNECT:
requests, err := c.subscribe(channels, symbols)
if err != nil {
// tls: use of closed connection
c.log.Printf("disconnect %v", err)
return fmt.Errorf("disconnect %v", err)
}
defer c.unsubscribe(requests)
var eg errgroup.Group
eg.Go(func() error {
for {
c.conn.SetReadDeadline(time.Now().Add(READDEADLINE))
_, msg, err := c.conn.ReadMessage()
if err != nil {
return fmt.Errorf("can't receive error: %v", err)
}
// start := time.Now()
name, err := jsonparser.GetString(msg, "params", "channel")
if err != nil {
continue
}
data, _, _, err := jsonparser.Get(msg, "params", "message")
if err != nil {
continue
}
var r Response
switch {
case strings.HasPrefix(name, "lightning_board_snapshot_"):
r.Types = Board
if err := json.Unmarshal(data, &r.Board); err != nil {
continue
}
case strings.HasPrefix(name, "lightning_board_"):
r.Types = Board
if err := json.Unmarshal(data, &r.Board); err != nil {
continue
}
case strings.HasPrefix(name, "lightning_ticker_"):
r.Types = Ticker
if err := json.Unmarshal(data, &r.Ticker); err != nil {
continue
}
case strings.HasPrefix(name, "lightning_executions_"):
r.Types = Executions
if err := json.Unmarshal(data, &r.Executions); err != nil {
continue
}
default:
r.Types = Undefined
r.Results = fmt.Errorf("%v", string(msg))
}
switch { // switch with ProductCode
case strings.HasSuffix(name, string(types.FXBTCJPY)):
r.ProductCode = types.FXBTCJPY
case strings.HasSuffix(name, string(types.BTCJPY)):
r.ProductCode = types.BTCJPY
case strings.HasSuffix(name, string(types.ETHJPY)):
r.ProductCode = types.ETHJPY
case strings.HasSuffix(name, string(types.ETHBTC)):
r.ProductCode = types.ETHBTC
default:
r.ProductCode = types.UNDEFINED
}
select { // 外部からの停止
case <-ctx.Done():
return ctx.Err()
default:
}
// log.Debugf("recieve to send time: %v\n", time.Now().Sub(start))
ch <- r
}
})
if err := eg.Wait(); err != nil {
c.log.Printf("%v", err)
// 外部からのキャンセル
if strings.Contains(err.Error(), context.Canceled.Error()) {
// defer close()/unsubscribe()
return fmt.Errorf("context stop in private %v", err)
}
}
// 明示的 Unsubscribed
// context.cancel()された場合は
c.unsubscribe(requests)
// Maintenanceならば待機
// Maintenanceでなければ、即再接続
if isMentenance() {
for {
if !isMentenance() {
break
}
time.Sleep(time.Second)
}
}
goto RECONNECT
}
func (p *Client) subscribe(channels, symbols []string) (requests []Request, err error) {
if symbols != nil {
for i := range channels {
for j := range symbols {
requests = append(requests, Request{
Jsonrpc: "2.0",
Method: "subscribe",
Params: map[string]interface{}{
"channel": fmt.Sprintf("%s_%s", channels[i], symbols[j]),
},
ID: 1,
})
}
}
} else {
for i := range channels {
requests = append(requests, Request{
Jsonrpc: "2.0",
Method: "subscribe",
Params: map[string]interface{}{
"channel": channels[i],
},
ID: 1,
})
}
}
for i := range requests {
if err := p.conn.WriteJSON(requests[i]); err != nil {
return nil, err
}
p.log.Printf("subscribed: %v", requests[i])
p.conn.SetReadDeadline(time.Now().Add(READDEADLINE))
_, msg, err := p.conn.ReadMessage()
if err != nil {
return nil, fmt.Errorf("can't receive error: %v", err)
}
if !bytes.Contains(msg, []byte(`true`)) && !strings.Contains(string(msg), fmt.Sprintf("%v", requests[i].Params["channel"])) {
return nil, fmt.Errorf("response has not true: %v", err)
}
}
return requests, nil
}
func (p *Client) unsubscribe(requests []Request) {
for i := range requests {
requests[i].Method = "unsubscribe"
if err := p.conn.WriteJSON(requests[i]); err != nil {
_, file, line, _ := runtime.Caller(0)
p.log.Printf("file:%s, line:%d, error:%+v", file, line, err)
}
}
p.log.Println("killed subscribe")
}