112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package utils
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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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"strings"
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"time"
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)
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func DownloadFile(url string, path string) (bool, string) {
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// 创建HTTP客户端
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client := &http.Client{
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Timeout: 5 * time.Second,
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}
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return DownloadFileWithClient(client, url, path)
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}
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func DownloadFileWithClient(client *http.Client, url string, path string) (bool, string) {
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return downloadWithProgress(client, url, path)
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}
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// 带进度显示的下载函数
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func downloadWithProgress(client *http.Client, url, dest string) (bool, string) {
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// 创建目标文件
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file, err := os.Create(dest)
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if err != nil {
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return false, fmt.Sprintf("创建文件失败: %w", err)
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}
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defer file.Close()
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// 发起请求
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resp, err := client.Get(url)
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if err != nil {
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return false, fmt.Sprintf("HTTP请求失败: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return false, fmt.Sprintf("服务器返回错误状态码: %s", resp.Status)
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}
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// 获取文件大小
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size := resp.ContentLength
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var downloaded int64
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// 打印下载信息
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fmt.Printf("开始下载: %s 大小: %s\n", url, HumanSizeInt(size))
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// 创建带进度跟踪的Reader
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progressReader := &progressReader{
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Reader: resp.Body,
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Reporter: func(r int64) {
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downloaded += r
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printProgress(downloaded, size)
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},
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}
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// 执行拷贝
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if _, err := io.Copy(file, progressReader); err != nil {
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return false, fmt.Sprintf("文件拷贝失败: %w", err)
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}
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fmt.Print("\n") // 保持最后进度显示的完整性
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return true, fmt.Sprintf("文件下载成功: %s", dest)
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}
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// 进度跟踪Reader
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type progressReader struct {
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io.Reader
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Reporter func(r int64)
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}
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func (pr *progressReader) Read(p []byte) (int, error) {
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n, err := pr.Reader.Read(p)
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if n > 0 {
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pr.Reporter(int64(n))
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}
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return n, err
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}
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// 打印进度信息
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func printProgress(downloaded, total int64) {
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const barLength = 40
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percent := float64(downloaded) / float64(total) * 100
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// 生成进度条
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filled := int(barLength * downloaded / total)
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bar := fmt.Sprintf("[%s%s]",
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strings.Repeat("=", filled),
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strings.Repeat(" ", barLength-filled))
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// 格式化为人类可读大小
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humanSize := func(bytes int64) string {
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const unit = 1024
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if bytes < unit {
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return fmt.Sprintf("%d B", bytes)
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}
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div, exp := int64(unit), 0
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for n := bytes / unit; n >= unit; n /= unit {
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div *= unit
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exp++
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}
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return fmt.Sprintf("%.1f %ciB", float64(bytes)/float64(div), "KMGTPE"[exp])
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}
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fmt.Printf("\r%-45s %6.2f%% %s/%s", bar, percent,
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humanSize(downloaded), humanSize(total))
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}
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