egutierrez
53200cbc0d
Nuevas funciones Go con tests en tres dominios: - core: parse_cron_expr, next_cron_time, join_by_key, validate_struct_fields + tipo CronSchedule - datascience: pivot (tabla dinámica), diff_entities (comparación de entidades) - infra: http_get_json, http_post_json, http_download_file, cache_to_sqlite, cron_ticker Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package infra
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import (
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"fmt"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"time"
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)
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// HttpDownloadFile descarga url en destPath en streaming con io.Copy.
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// Crea directorios intermedios con os.MkdirAll. Usa archivo temporal + rename
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// para garantizar atomicidad (no deja archivo corrupto si falla a mitad).
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// Retorna los bytes escritos.
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func HttpDownloadFile(url, destPath string, headers map[string]string, timeout time.Duration) (int64, error) {
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client := &http.Client{Timeout: timeout}
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req, err := http.NewRequest(http.MethodGet, url, nil)
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if err != nil {
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return 0, fmt.Errorf("http_download_file: build request: %w", err)
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}
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for k, v := range headers {
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req.Header.Set(k, v)
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}
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resp, err := client.Do(req)
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if err != nil {
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return 0, fmt.Errorf("http_download_file: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 400 {
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shortURL := url
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if len(shortURL) > 100 {
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shortURL = shortURL[:100]
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}
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return 0, fmt.Errorf("http_download_file: HTTP %d at %q", resp.StatusCode, shortURL)
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}
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dir := filepath.Dir(destPath)
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return 0, fmt.Errorf("http_download_file: create dirs: %w", err)
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}
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// Archivo temporal en el mismo directorio para que rename sea atomico
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tmp, err := os.CreateTemp(dir, ".download-*")
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if err != nil {
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return 0, fmt.Errorf("http_download_file: create temp file: %w", err)
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}
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tmpPath := tmp.Name()
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defer func() {
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tmp.Close()
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os.Remove(tmpPath) // no-op si rename tuvo exito
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}()
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n, err := io.Copy(tmp, resp.Body)
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if err != nil {
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return 0, fmt.Errorf("http_download_file: write: %w", err)
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}
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if err := tmp.Close(); err != nil {
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return 0, fmt.Errorf("http_download_file: close temp: %w", err)
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}
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if err := os.Rename(tmpPath, destPath); err != nil {
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return 0, fmt.Errorf("http_download_file: rename: %w", err)
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}
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return n, nil
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}
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