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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| package scrapers | ||
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| import ( | ||
| "fmt" | ||
| "net/url" | ||
| "os" | ||
| "os/signal" | ||
| "sync" | ||
| "syscall" | ||
| "time" | ||
|
|
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| zap "go.uber.org/zap" | ||
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| "github.com/gorilla/websocket" | ||
| writers "github.com/diadata-org/diadata/internal/pkg/scraper-writers" | ||
| ) | ||
|
|
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| const scrapeDataSaveLocationBitmex = "" | ||
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| // BitmexScraper - use the NewBitmexFuturesScraper function to create an instance | ||
| type BitmexScraper struct { | ||
| Markets []string | ||
| WaitGroup *sync.WaitGroup | ||
| Writer writers.Writer | ||
| Logger *zap.SugaredLogger | ||
| } | ||
|
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| // NewBitmexFuturesScraper - returns an instance of an options scraper. | ||
| func NewBitmexFuturesScraper(markets []string) FuturesScraper { | ||
| wg := sync.WaitGroup{} | ||
| writer := writers.FileWriter{} | ||
| logger := zap.NewExample().Sugar() // or NewProduction, or NewDevelopment | ||
| defer logger.Sync() | ||
|
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| var scraper FuturesScraper = &BitmexScraper{ | ||
| WaitGroup: &wg, | ||
| Markets: markets, | ||
| Writer: &writer, | ||
| Logger: logger, | ||
| } | ||
|
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| return scraper | ||
| } | ||
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| func (s *BitmexScraper) send(message *map[string]interface{}, market string, websocketConn *websocket.Conn) error { | ||
| err := websocketConn.WriteJSON(*message) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| s.Logger.Debugf("sent message [%s]: %s", market, message) | ||
| return nil | ||
| } | ||
|
|
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| // Authenticate - placeholder here, since we do not need to authneticate the connection. | ||
| func (s *BitmexScraper) Authenticate(market string, connection interface{}) error { | ||
| return nil | ||
| } | ||
|
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| // ScraperClose - safely closes the scraper; We pass the interface connection as the second argument | ||
| // primarily for the reason that Huobi scraper does not use the gorilla websocket; It uses golang's x websocket; | ||
| // If we did not define this method in our FuturesScraper interface, we could have easily used the pointer | ||
| // to gorilla websocket here; However, to make FuturesScraper more ubiquituous, we need an interface here. | ||
| func (s *BitmexScraper) ScraperClose(market string, connection interface{}) error { | ||
| switch c := connection.(type) { | ||
| case *websocket.Conn: | ||
| // unsubscribe from the channel | ||
| err := s.send(&map[string]interface{}{"op": "unsubscribe", "args": []string{"trade:" + market}}, market, c) | ||
| if err != nil { | ||
| s.Logger.Errorf("could not send a channel unsubscription message, err: %s", err) | ||
| return err | ||
| } | ||
| // close the websocket connection | ||
| err = s.write(websocket.CloseMessage, []byte{}, c) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = c.Close() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| s.Logger.Infof("gracefully shutdown bitmex scraper on market: %s", market) | ||
| time.Sleep(time.Duration(retryIn) * time.Second) | ||
| return nil | ||
| default: | ||
| return fmt.Errorf("unknown connection type: %T", connection) | ||
| } | ||
| } | ||
|
|
||
| // Scrape starts a websocket scraper for market | ||
| func (s *BitmexScraper) Scrape(market string) { | ||
| // this block is for listening to sigterms and interupts | ||
| sigs := make(chan os.Signal, 1) | ||
| signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) | ||
| userCancelled := make(chan bool, 1) | ||
| go func() { | ||
| sig := <-sigs | ||
| fmt.Println(sig) | ||
| userCancelled <- true | ||
| }() | ||
|
|
||
| for { | ||
| // immediately invoked function expression for easy clenup with defer | ||
| func() { | ||
| u := url.URL{Scheme: "wss", Host: "www.bitmex.com", Path: "/realtime"} | ||
| s.Logger.Debugf("connecting to [%s], market: [%s]", u.String(), market) | ||
| ws, _, err := websocket.DefaultDialer.Dial(u.String(), nil) | ||
| if err != nil { | ||
| s.Logger.Errorf("could not dial Bitmex websocket: %s", err) | ||
| time.Sleep(time.Duration(retryIn) * time.Second) | ||
| return | ||
| } | ||
| defer s.ScraperClose(market, ws) | ||
| ws.SetPongHandler(func(appData string) error { | ||
| s.Logger.Debugf("received a pong frame") | ||
| return nil | ||
| }) | ||
| err = s.send(&map[string]interface{}{"op": "subscribe", "args": []string{"trade:" + market}}, market, ws) | ||
| if err != nil { | ||
| s.Logger.Errorf("could not send a channel subscription message. retrying, err: %s", err) | ||
| return | ||
| } | ||
| tick := time.NewTicker(15 * time.Second) | ||
| defer tick.Stop() | ||
| go func() { | ||
| for { | ||
| select { | ||
| case <-tick.C: | ||
| err := s.write(websocket.PingMessage, []byte{}, ws) | ||
| if err != nil { | ||
| s.Logger.Errorf("error experienced pinging coinflex, err: %s", err) | ||
| return | ||
| } | ||
| s.Logger.Debugf("pinged the coinflex server. market: [%s]", market) | ||
| } | ||
| } | ||
| }() | ||
| for { | ||
| select { | ||
| case <-userCancelled: | ||
| s.Logger.Infof("received interrupt, gracefully shutting down") | ||
| s.ScraperClose(market, ws) | ||
| os.Exit(0) | ||
| default: | ||
| _, message, err := ws.ReadMessage() | ||
| if err != nil { | ||
| s.Logger.Errorf("repeated read error, restarting") | ||
| return | ||
| } | ||
| s.Logger.Debugf("received new message: %s, saving new message", message) | ||
| _, err = s.Writer.Write(string(message)+"\n", scrapeDataSaveLocationBitmex+s.Writer.GetWriteFileName("Bitmex", market)) | ||
| if err != nil { | ||
| s.Logger.Errorf("could not write to file, err: %s", err) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| } | ||
| } | ||
|
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| // write's primary purpose is to write a ping frame op code to keep the websocket connection alive | ||
| func (s *BitmexScraper) write(mt int, payload []byte, ws *websocket.Conn) error { | ||
| ws.SetWriteDeadline(time.Now().Add(15 * time.Second)) | ||
| return ws.WriteMessage(mt, payload) | ||
| } | ||
|
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| // ScrapeMarkets - will scrape the markets specified during instantiation | ||
| func (s *BitmexScraper) ScrapeMarkets() { | ||
| for _, market := range s.Markets { | ||
| s.WaitGroup.Add(1) | ||
| go s.Scrape(market) | ||
| } | ||
| s.WaitGroup.Wait() | ||
| } | ||
|
|
||
| // usage example | ||
| // func main() { | ||
| // wg := sync.WaitGroup{} | ||
| // futuresBitmex := scrapers.NewBitmexFuturesScraper([]string{"XBTUSD", "XBTZ19", "XBTH20", "XBTM20", "ETHUSD", "ETHZ19", "ETHH20"}) | ||
| // futuresBitmex.ScrapeMarkets() | ||
| // wg.Wait() | ||
| // } |
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