59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
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// Download real BTCUSDT hourly klines from the Binance REST API into a CSV that the
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// other examples can consume. Requires network access (build-only in CI).
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package main
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import (
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"bufio"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"path/filepath"
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)
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func main() {
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const url = "https://api.binance.com/api/v3/klines?symbol=BTCUSDT&interval=1h&limit=500"
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fmt.Printf("Fetching %s\n", url)
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resp, err := http.Get(url)
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if err != nil {
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log.Fatalf("request: %v", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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log.Fatalf("read body: %v", err)
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}
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// Binance kline array: [openTime, open, high, low, close, volume, ...].
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var klines [][]any
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if err := json.Unmarshal(body, &klines); err != nil {
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log.Fatalf("parse json: %v", err)
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}
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dir := "data"
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if err := os.MkdirAll(dir, 0o755); err != nil {
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log.Fatalf("mkdir: %v", err)
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}
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path := filepath.Join(dir, "btcusdt_1h.csv")
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file, err := os.Create(path)
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if err != nil {
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log.Fatalf("create: %v", err)
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}
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defer file.Close()
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writer := bufio.NewWriter(file)
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defer writer.Flush()
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fmt.Fprintln(writer, "timestamp,open,high,low,close,volume")
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count := 0
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for _, k := range klines {
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ts := int64(k[0].(float64))
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fmt.Fprintf(writer, "%d,%s,%s,%s,%s,%s\n", ts, k[1], k[2], k[3], k[4], k[5])
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count++
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}
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fmt.Printf("Wrote %d klines to %s\n", count, path)
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}
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