84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
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package service
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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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"strconv"
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)
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// ProgressWriter is a custom writer to track progress and execute a callback
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type ProgressWriter struct {
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io.Writer
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Total int64
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Progress int64
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Callback func(progress int64, total int64)
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}
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func (pw *ProgressWriter) Write(p []byte) (int, error) {
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n, err := pw.Writer.Write(p)
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if err != nil {
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return n, err
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}
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pw.Progress += int64(n)
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pw.Callback(pw.Progress, pw.Total)
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return n, nil
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}
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func DownloadFile(url string, filePath string, overwrite bool, callback func(progress int64, total int64)) error {
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// Check if the file exists
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if _, err := os.Stat(filePath); err == nil {
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if overwrite {
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// Overwrite the file if it exists
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if err := os.Remove(filePath); err != nil {
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return err
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}
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} else {
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return fmt.Errorf("file %s already exists", filePath)
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}
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}
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// Create the file
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out, err := os.Create(filePath)
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if err != nil {
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return err
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}
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defer out.Close()
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// Get the data
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resp, err := http.Get(url)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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// Check server response
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("bad status: %s", resp.Status)
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}
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// Get the size
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size, err := strconv.Atoi(resp.Header.Get("Content-Length"))
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if err != nil {
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return err
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}
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// Create progress writer
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pw := &ProgressWriter{
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Writer: out,
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Total: int64(size),
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Callback: callback,
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}
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// Write the body to file with progress
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_, err = io.Copy(pw, resp.Body)
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if err != nil {
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return err
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}
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fmt.Println("\nDownload complete")
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return nil
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}
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