Added example with Binance integration

Author: DenekUrich

exchange.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/net/websocket"
+)
+
+type Command struct {
+	Name string
+	Args []string
+}
+
+type Exchange struct {
+	sync.RWMutex
+
+	Name string
+
+	addr   string
+	origin string
+	ws     *websocket.Conn
+	reqID  int64
+}
+
+func NewExchange(name, addr, origin string) *Exchange {
+	return &Exchange{
+		Name:   name,
+		addr:   addr,
+		origin: origin,
+		reqID:  1,
+	}
+}
+
+func (e *Exchange) Run() {
+	for {
+		ws, err := websocket.Dial(e.addr, "", e.origin)
+		if err != nil {
+			log.Println(fmt.Errorf("unable to connect to %s, reconnecting... %s", e.Name, err))
+			time.Sleep(BinanceReconnectDelay * time.Second)
+			continue
+		}
+		e.ws = ws
+
+		e.readMessages()
+
+		log.Printf("%s run", e.Name)
+	}
+}
+
+func (e *Exchange) readMessages() {
+	var data []byte
+	for {
+		err := websocket.Message.Receive(e.ws, &data)
+		if errors.Is(err, io.EOF) {
+			return
+		}
+
+		if err != nil {
+			log.Println(err)
+			return
+		}
+
+		log.Println(string(data))
+	}
+}
+
+func (e *Exchange) sendMessage(message []byte) {
+	log.Printf("send: %s: %s", e.Name, string(message))
+	err := websocket.Message.Send(e.ws, string(message))
+	if err != nil {
+		log.Println(err)
+		return
+	}
+}
+
+func (e *Exchange) FormatPair(pair string) string {
+
+	pair = strings.ReplaceAll(pair, "/", "")
+	pair = strings.ToLower(pair)
+
+	return pair
+}
+
+func (e *Exchange) incrReqID() {
+	e.Lock()
+	defer e.Unlock()
+	e.reqID++
+}
+
+func (e *Exchange) Subscribe(pair string) {
+	req := "{\"method\": \"SUBSCRIBE\", \"params\": [\"%s@bookTicker\"], \"id\": %d}\n"
+
+	e.sendMessage([]byte(fmt.Sprintf(req, e.FormatPair(pair), e.reqID)))
+	e.incrReqID()
+
+}
+
+func (e *Exchange) Unsubscribe(pair string) {
+	req := "{\"method\": \"UNSUBSCRIBE\", \"params\": [\"%s@bookTicker\"], \"id\": %d}\n"
+
+	e.sendMessage([]byte(fmt.Sprintf(req, e.FormatPair(pair), e.reqID)))
+	e.incrReqID()
+}

go.mod

@@ -1,3 +1,36 @@
 module golang-binance
 
 go 1.21.5
+
+require (
+	github.com/gin-gonic/gin v1.10.0
+	golang.org/x/net v0.25.0
+)
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,79 @@
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
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+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
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http.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"strings"
+	"sync"
+
+	"github.com/gin-gonic/gin"
+)
+
+type Server struct {
+	*sync.RWMutex
+	Pairs     map[string]bool
+	exchanges map[string]*Exchange
+}
+
+func NewServer() *Server {
+	return &Server{
+		RWMutex:   &sync.RWMutex{},
+		Pairs:     make(map[string]bool),
+		exchanges: make(map[string]*Exchange),
+	}
+}
+
+func (s *Server) Subscribes(c *gin.Context) {
+	s.RLock()
+	defer s.RUnlock()
+
+	for pair := range s.Pairs {
+		c.Writer.Write([]byte(pair + "\n"))
+	}
+}
+
+func (s *Server) Subscribe(c *gin.Context) {
+	s.Lock()
+	defer s.Unlock()
+
+	pairs := strings.Split(c.PostForm("pairs"), ",")
+	for _, pair := range pairs {
+		for _, exchange := range s.exchanges {
+			exchange.Subscribe(pair)
+		}
+	}
+}
+
+func (s *Server) Unsubscribe(c *gin.Context) {
+	s.Lock()
+	defer s.Unlock()
+
+	pairs := strings.Split(c.PostForm("pairs"), ",")
+	for _, pair := range pairs {
+		for _, exchange := range s.exchanges {
+			exchange.Unsubscribe(pair)
+		}
+	}
+}
+
+func (s *Server) AddExchange(exchange *Exchange) {
+	s.Lock()
+	defer s.Unlock()
+
+	s.exchanges[exchange.Name] = exchange
+}

main.go

@@ -1,7 +1,25 @@
 package main
 
-import "log"
+import (
+	"github.com/gin-gonic/gin"
+)
+
+const BinanceAddr = "wss://stream.binance.com/ws"
+const BinanceOrigin = "https://stream.binance.com"
+const BinanceReconnectDelay = 3
 
 func main() {
-	log.Println("Hello, Binance")
+
+	binance := NewExchange("binance", BinanceAddr, BinanceOrigin)
+	go binance.Run()
+
+	s := NewServer()
+	s.AddExchange(binance)
+
+	r := gin.Default()
+	r.GET("/subscribes", s.Subscribes)
+	r.POST("/subscribe", s.Subscribe)
+	r.POST("/unsubscribe", s.Unsubscribe)
+
+	r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
 }