40273b1d36
This changeset implements immutable manifest references via the HTTP API. Most of the changes follow from modifications to ManifestService. Once updates were made across the repo to implement these changes, the http handlers were change accordingly. The new methods on ManifestService will be broken out into a tagging service in a later PR. Unfortunately, due to complexities around managing the manifest tag index in an eventually consistent manner, direct deletes of manifests have been disabled. Signed-off-by: Stephen J Day <stephen.day@docker.com>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package handlers
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import (
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"net/http"
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"github.com/docker/distribution"
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ctxu "github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/registry/api/v2"
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"github.com/gorilla/handlers"
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)
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// layerDispatcher uses the request context to build a layerHandler.
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func layerDispatcher(ctx *Context, r *http.Request) http.Handler {
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dgst, err := getDigest(ctx)
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if err != nil {
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if err == errDigestNotAvailable {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusNotFound)
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ctx.Errors.Push(v2.ErrorCodeDigestInvalid, err)
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})
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx.Errors.Push(v2.ErrorCodeDigestInvalid, err)
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})
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}
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layerHandler := &layerHandler{
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Context: ctx,
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Digest: dgst,
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}
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return handlers.MethodHandler{
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"GET": http.HandlerFunc(layerHandler.GetLayer),
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"HEAD": http.HandlerFunc(layerHandler.GetLayer),
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}
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}
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// layerHandler serves http layer requests.
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type layerHandler struct {
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*Context
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Digest digest.Digest
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}
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// GetLayer fetches the binary data from backend storage returns it in the
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// response.
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func (lh *layerHandler) GetLayer(w http.ResponseWriter, r *http.Request) {
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ctxu.GetLogger(lh).Debug("GetImageLayer")
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layers := lh.Repository.Layers()
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layer, err := layers.Fetch(lh.Digest)
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if err != nil {
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switch err := err.(type) {
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case distribution.ErrUnknownLayer:
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w.WriteHeader(http.StatusNotFound)
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lh.Errors.Push(v2.ErrorCodeBlobUnknown, err.FSLayer)
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default:
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lh.Errors.Push(v2.ErrorCodeUnknown, err)
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}
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return
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}
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defer layer.Close()
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w.Header().Set("Docker-Content-Digest", lh.Digest.String())
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if lh.layerHandler != nil {
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handler, _ := lh.layerHandler.Resolve(layer)
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if handler != nil {
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handler.ServeHTTP(w, r)
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return
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}
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}
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http.ServeContent(w, r, layer.Digest().String(), layer.CreatedAt(), layer)
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}
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