55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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// Stream live BTCUSDT 1-minute klines from Binance and feed each close through EMA(20).
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// Requires network access (build-only in CI). Runs for up to 60 seconds.
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package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"log"
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"strconv"
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"time"
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"github.com/coder/websocket"
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wickra "github.com/wickra-lib/wickra/bindings/go"
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)
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func main() {
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const url = "wss://stream.binance.com:9443/ws/btcusdt@kline_1m"
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fmt.Printf("Connecting to %s (up to 60s)...\n", url)
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ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
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defer cancel()
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conn, _, err := websocket.Dial(ctx, url, nil)
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if err != nil {
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log.Fatalf("dial: %v", err)
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}
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defer conn.CloseNow()
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ema, _ := wickra.NewEma(20)
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defer ema.Close()
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for {
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_, data, err := conn.Read(ctx)
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if err != nil {
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fmt.Println("Done (time limit reached).")
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return
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}
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var msg struct {
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K struct {
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Close string `json:"c"`
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} `json:"k"`
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}
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if err := json.Unmarshal(data, &msg); err != nil || msg.K.Close == "" {
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continue
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}
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closePx, err := strconv.ParseFloat(msg.K.Close, 64)
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if err != nil {
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continue
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}
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fmt.Printf("close=%.2f EMA(20)=%.2f\n", closePx, ema.Update(closePx))
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}
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}
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