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Remove pathMapper object

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The use of the pathMapper is no longer needed the way we have organized the
code base. The extra level of indirection has proved unnecessary and confusing
so we've opted to clean it up. In the future, we may require more flexibility,
but now it is simply not required.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2015-08-17 18:51:05 -07:00
parent 9174fc62d2
commit 614e8c8277
15 changed files with 93 additions and 91 deletions
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53
docs/storage/paths.go
View file

@ -8,10 +8,18 @@ import (
"github.com/docker/distribution/digest"
)
const storagePathVersion = "v2"
const (
storagePathVersion = "v2" // fixed storage layout version
storagePathRoot = "/docker/registry/" // all driver paths have a prefix
// pathMapper maps paths based on "object names" and their ids. The "object
// names" mapped by pathMapper are internal to the storage system.
// TODO(stevvooe): Get rid of the "storagePathRoot". Initially, we though
// storage path root would configurable for all drivers through this
// package. In reality, we've found it simpler to do this on a per driver
// basis.
)
// pathFor maps paths based on "object names" and their ids. The "object
// names" mapped by are internal to the storage system.
//
// The path layout in the storage backend is roughly as follows:
//
@ -37,7 +45,7 @@ const storagePathVersion = "v2"
// -> blob/<algorithm>
// <split directory content addressable storage>
//
// The storage backend layout is broken up into a content- addressable blob
// The storage backend layout is broken up into a content-addressable blob
// store and repositories. The content-addressable blob store holds most data
// throughout the backend, keyed by algorithm and digests of the underlying
// content. Access to the blob store is controled through links from the
@ -98,18 +106,7 @@ const storagePathVersion = "v2"
//
// For more information on the semantic meaning of each path and their
// contents, please see the path spec documentation.
type pathMapper struct {
root string
version string // should be a constant?
}
var defaultPathMapper = &pathMapper{
root: "/docker/registry/",
version: storagePathVersion,
}
// path returns the path identified by spec.
func (pm *pathMapper) path(spec pathSpec) (string, error) {
func pathFor(spec pathSpec) (string, error) {
// Switch on the path object type and return the appropriate path. At
// first glance, one may wonder why we don't use an interface to
@ -123,7 +120,7 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
// to an intermediate path object, than can be consumed and mapped by the
// other version.
rootPrefix := []string{pm.root, pm.version}
rootPrefix := []string{storagePathRoot, storagePathVersion}
repoPrefix := append(rootPrefix, "repositories")
switch v := spec.(type) {
@ -136,7 +133,7 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
return path.Join(append(append(repoPrefix, v.name, "_manifests", "revisions"), components...)...), nil
case manifestRevisionLinkPathSpec:
root, err := pm.path(manifestRevisionPathSpec{
root, err := pathFor(manifestRevisionPathSpec{
name: v.name,
revision: v.revision,
})
@ -147,7 +144,7 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
return path.Join(root, "link"), nil
case manifestSignaturesPathSpec:
root, err := pm.path(manifestRevisionPathSpec{
root, err := pathFor(manifestRevisionPathSpec{
name: v.name,
revision: v.revision,
})
@ -158,10 +155,11 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
return path.Join(root, "signatures"), nil
case manifestSignatureLinkPathSpec:
root, err := pm.path(manifestSignaturesPathSpec{
root, err := pathFor(manifestSignaturesPathSpec{
name: v.name,
revision: v.revision,
})
if err != nil {
return "", err
}
@ -175,50 +173,55 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
case manifestTagsPathSpec:
return path.Join(append(repoPrefix, v.name, "_manifests", "tags")...), nil
case manifestTagPathSpec:
root, err := pm.path(manifestTagsPathSpec{
root, err := pathFor(manifestTagsPathSpec{
name: v.name,
})
if err != nil {
return "", err
}
return path.Join(root, v.tag), nil
case manifestTagCurrentPathSpec:
root, err := pm.path(manifestTagPathSpec{
root, err := pathFor(manifestTagPathSpec{
name: v.name,
tag: v.tag,
})
if err != nil {
return "", err
}
return path.Join(root, "current", "link"), nil
case manifestTagIndexPathSpec:
root, err := pm.path(manifestTagPathSpec{
root, err := pathFor(manifestTagPathSpec{
name: v.name,
tag: v.tag,
})
if err != nil {
return "", err
}
return path.Join(root, "index"), nil
case manifestTagIndexEntryLinkPathSpec:
root, err := pm.path(manifestTagIndexEntryPathSpec{
root, err := pathFor(manifestTagIndexEntryPathSpec{
name: v.name,
tag: v.tag,
revision: v.revision,
})
if err != nil {
return "", err
}
return path.Join(root, "link"), nil
case manifestTagIndexEntryPathSpec:
root, err := pm.path(manifestTagIndexPathSpec{
root, err := pathFor(manifestTagIndexPathSpec{
name: v.name,
tag: v.tag,
})
if err != nil {
return "", err
}