5d750c4170
Downloads core-devops images from custom CDN with progress reporting. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
package sources
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import (
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"context"
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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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)
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// CDNSource downloads images from a CDN or S3 bucket.
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type CDNSource struct {
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config SourceConfig
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}
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// Compile-time interface check.
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var _ ImageSource = (*CDNSource)(nil)
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// NewCDNSource creates a new CDN source.
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func NewCDNSource(cfg SourceConfig) *CDNSource {
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return &CDNSource{config: cfg}
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}
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// Name returns "cdn".
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func (s *CDNSource) Name() string {
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return "cdn"
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}
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// Available checks if CDN URL is configured.
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func (s *CDNSource) Available() bool {
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return s.config.CDNURL != ""
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}
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// LatestVersion fetches version from manifest or returns "latest".
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func (s *CDNSource) LatestVersion(ctx context.Context) (string, error) {
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// Try to fetch manifest.json for version info
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url := fmt.Sprintf("%s/manifest.json", s.config.CDNURL)
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req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
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if err != nil {
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return "latest", nil
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil || resp.StatusCode != 200 {
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return "latest", nil
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}
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defer resp.Body.Close()
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// For now, just return latest - could parse manifest for version
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return "latest", nil
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}
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// Download downloads the image from CDN.
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func (s *CDNSource) Download(ctx context.Context, dest string, progress func(downloaded, total int64)) error {
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url := fmt.Sprintf("%s/%s", s.config.CDNURL, s.config.ImageName)
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req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
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if err != nil {
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return fmt.Errorf("cdn.Download: %w", err)
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return fmt.Errorf("cdn.Download: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf("cdn.Download: HTTP %d", resp.StatusCode)
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}
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// Ensure dest directory exists
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if err := os.MkdirAll(dest, 0755); err != nil {
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return fmt.Errorf("cdn.Download: %w", err)
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}
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// Create destination file
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destPath := filepath.Join(dest, s.config.ImageName)
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f, err := os.Create(destPath)
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if err != nil {
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return fmt.Errorf("cdn.Download: %w", err)
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}
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defer f.Close()
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// Copy with progress
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total := resp.ContentLength
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var downloaded int64
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buf := make([]byte, 32*1024)
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for {
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n, err := resp.Body.Read(buf)
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if n > 0 {
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if _, werr := f.Write(buf[:n]); werr != nil {
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return fmt.Errorf("cdn.Download: %w", werr)
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}
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downloaded += int64(n)
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if progress != nil {
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progress(downloaded, total)
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}
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}
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if err == io.EOF {
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break
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}
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if err != nil {
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return fmt.Errorf("cdn.Download: %w", err)
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}
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}
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return nil
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}
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