249ad3b76d
After consideration, we've changed the main descriptor field name to for number of bytes to "size" to match convention. While this may be a subjective argument, commonly we refer to files by their "size" rather than their "length". This will match other conventions, like `(FileInfo).Size()` and methods on `io.SizeReaderAt`. Under more broad analysis, this argument doesn't necessarily hold up. If anything, "size" is shorter than "length". Signed-off-by: Stephen J Day <stephen.day@docker.com>
73 lines
2 KiB
Go
73 lines
2 KiB
Go
package storage
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/registry/storage/driver"
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)
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// TODO(stevvooe): This should configurable in the future.
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const blobCacheControlMaxAge = 365 * 24 * time.Hour
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// blobServer simply serves blobs from a driver instance using a path function
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// to identify paths and a descriptor service to fill in metadata.
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type blobServer struct {
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driver driver.StorageDriver
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statter distribution.BlobStatter
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pathFn func(dgst digest.Digest) (string, error)
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}
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func (bs *blobServer) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
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desc, err := bs.statter.Stat(ctx, dgst)
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if err != nil {
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return err
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}
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path, err := bs.pathFn(desc.Digest)
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if err != nil {
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return err
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}
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redirectURL, err := bs.driver.URLFor(ctx, path, map[string]interface{}{"method": r.Method})
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switch err {
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case nil:
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// Redirect to storage URL.
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http.Redirect(w, r, redirectURL, http.StatusTemporaryRedirect)
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case driver.ErrUnsupportedMethod:
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// Fallback to serving the content directly.
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br, err := newFileReader(ctx, bs.driver, path, desc.Size)
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if err != nil {
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return err
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}
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defer br.Close()
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w.Header().Set("ETag", desc.Digest.String()) // If-None-Match handled by ServeContent
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w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%.f", blobCacheControlMaxAge.Seconds()))
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if w.Header().Get("Docker-Content-Digest") == "" {
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w.Header().Set("Docker-Content-Digest", desc.Digest.String())
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}
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if w.Header().Get("Content-Type") == "" {
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// Set the content type if not already set.
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w.Header().Set("Content-Type", desc.MediaType)
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}
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if w.Header().Get("Content-Length") == "" {
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// Set the content length if not already set.
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w.Header().Set("Content-Length", fmt.Sprint(desc.Size))
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}
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http.ServeContent(w, r, desc.Digest.String(), time.Time{}, br)
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return nil
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}
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// Some unexpected error.
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return err
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}
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