From 37a213dc4b2aaebc0c1a8077bf8f0cf82d67df8e Mon Sep 17 00:00:00 2001 From: James Hewitt Date: Fri, 18 Aug 2023 13:52:37 +0100 Subject: [PATCH] Revert "optimize catalog last param" This reverts commit 65f4ce4d9397fbec875e985d7169186ac94c8ac2. Signed-off-by: James Hewitt --- registry/storage/catalog.go | 163 ++++++++++++++----------------- registry/storage/catalog_test.go | 4 +- 2 files changed, 75 insertions(+), 92 deletions(-) diff --git a/registry/storage/catalog.go b/registry/storage/catalog.go index 2afbdfc8..55500694 100644 --- a/registry/storage/catalog.go +++ b/registry/storage/catalog.go @@ -5,17 +5,12 @@ import ( "errors" "io" "path" - "sort" "strings" "github.com/distribution/distribution/v3/reference" "github.com/distribution/distribution/v3/registry/storage/driver" ) -var ( - ErrStopRec = errors.New("Stopped the recursion for getting repositories") -) - // Returns a list, or partial list, of repositories in the registry. // Because it's a quite expensive operation, it should only be used when building up // an initial set of repositories. @@ -32,17 +27,20 @@ func (reg *registry) Repositories(ctx context.Context, repos []string, last stri return 0, err } - err = reg.getRepositories(ctx, root, last, func(repoPath string) error { - // this is placed before the append, - // so that we will get a extra repo if - // any. This assures that we do not return - // io.EOF without it being the last record. - if len(foundRepos) == len(repos) { - finishedWalk = true - return ErrStopRec + err = reg.blobStore.driver.Walk(ctx, root, func(fileInfo driver.FileInfo) error { + err := handleRepository(fileInfo, root, last, func(repoPath string) error { + foundRepos = append(foundRepos, repoPath) + return nil + }) + if err != nil { + return err } - foundRepos = append(foundRepos, repoPath) + // if we've filled our array, no need to walk any further + if len(foundRepos) == len(repos) { + finishedWalk = true + return driver.ErrSkipDir + } return nil }) @@ -66,7 +64,11 @@ func (reg *registry) Enumerate(ctx context.Context, ingester func(string) error) return err } - return reg.getRepositories(ctx, root, "", ingester) + err = reg.blobStore.driver.Walk(ctx, root, func(fileInfo driver.FileInfo) error { + return handleRepository(fileInfo, root, "", ingester) + }) + + return err } // Remove removes a repository from storage @@ -79,95 +81,78 @@ func (reg *registry) Remove(ctx context.Context, name reference.Named) error { return reg.driver.Delete(ctx, repoDir) } -// getRepositories is a helper function for getRepositoriesRec calls -// the function fn with a repository path, if the current path looked -// at is a repository and is lexicographically after last. It is possible -// to return driver.ErrSkipDir, if there is no interest in any repositories -// under the given `repoPath`, or call ErrStopRec if the recursion should stop. -func (reg *registry) getRepositories(ctx context.Context, root, last string, fn func(repoPath string) error) error { - midFn := fn - - // middleware func to exclude the `last` repo - // only use it, if there is set a last. - if last != "" { - midFn = func(repoPath string) error { - if repoPath != last { - return fn(repoPath) - } - return nil - } - } - - // call our recursive func, with the midFn and the start path - // of where we want to find repositories. - err := reg.getRepositoriesRec(ctx, root, root, last, midFn) - if err == ErrStopRec { - return nil - } - return err +// lessPath returns true if one path a is less than path b. +// +// A component-wise comparison is done, rather than the lexical comparison of +// strings. +func lessPath(a, b string) bool { + // we provide this behavior by making separator always sort first. + return compareReplaceInline(a, b, '/', '\x00') < 0 } -// getRepositoriesRec recurse through all folders it the `lookPath`, -// there it will try to find repositories. See getRepositories for more. -func (reg *registry) getRepositoriesRec(ctx context.Context, root, lookPath, last string, fn func(repoPath string) error) error { - // ensure that the current path is a dir, otherwise we just return - if f, err := reg.blobStore.driver.Stat(ctx, lookPath); err != nil || !f.IsDir() { - if err != nil { - return err - } - return nil +// compareReplaceInline modifies runtime.cmpstring to replace old with new +// during a byte-wise comparison. +func compareReplaceInline(s1, s2 string, old, new byte) int { + // TODO(stevvooe): We are missing an optimization when the s1 and s2 have + // the exact same slice header. It will make the code unsafe but can + // provide some extra performance. + + l := len(s1) + if len(s2) < l { + l = len(s2) } - // get children in the current path - children, err := reg.blobStore.driver.List(ctx, lookPath) - if err != nil { - return err - } - - // sort this, so that it will be added in the correct order - sort.Strings(children) - - if last != "" { - splitLasts := strings.Split(last, "/") - - // call the next iteration of getRepositoriesRec if any, but - // exclude the current one. - if len(splitLasts) > 1 { - if err := reg.getRepositoriesRec(ctx, root, lookPath+"/"+splitLasts[0], strings.Join(splitLasts[1:], "/"), fn); err != nil { - return err - } + for i := 0; i < l; i++ { + c1, c2 := s1[i], s2[i] + if c1 == old { + c1 = new } - // find current last path in our children - n := sort.SearchStrings(children, lookPath+"/"+splitLasts[0]) - if n == len(children) || children[n] != lookPath+"/"+splitLasts[0] { - return errors.New("the provided 'last' repositories does not exists") + if c2 == old { + c2 = new } - // if this is not a final `last` (there are more `/` left) - // then exclude the current index, else include it - if len(splitLasts) > 1 { - children = children[n+1:] - } else { - children = children[n:] + if c1 < c2 { + return -1 + } + + if c1 > c2 { + return +1 } } - for _, child := range children { - _, file := path.Split(child) + if len(s1) < len(s2) { + return -1 + } - if file == "_manifest" { - if err := fn(strings.TrimPrefix(lookPath, root+"/")); err != nil { - if err == driver.ErrSkipDir { - break - } - return err - } - } else if file[0] != '_' { - if err := reg.getRepositoriesRec(ctx, root, child, "", fn); err != nil { + if len(s1) > len(s2) { + return +1 + } + + return 0 +} + +// handleRepository calls function fn with a repository path if fileInfo +// has a path of a repository under root and that it is lexographically +// after last. Otherwise, it will return ErrSkipDir. This should be used +// with Walk to do handling with repositories in a storage. +func handleRepository(fileInfo driver.FileInfo, root, last string, fn func(repoPath string) error) error { + filePath := fileInfo.Path() + + // lop the base path off + repo := filePath[len(root)+1:] + + _, file := path.Split(repo) + if file == "_manifests" { + repo = strings.TrimSuffix(repo, "/_manifests") + if lessPath(last, repo) { + if err := fn(repo); err != nil { return err } } + return driver.ErrSkipDir + } else if strings.HasPrefix(file, "_") { + return driver.ErrSkipDir } return nil diff --git a/registry/storage/catalog_test.go b/registry/storage/catalog_test.go index 20764055..14ba4e83 100644 --- a/registry/storage/catalog_test.go +++ b/registry/storage/catalog_test.go @@ -4,6 +4,7 @@ import ( "context" "fmt" "io" + "math/rand" "testing" "github.com/distribution/distribution/v3" @@ -240,7 +241,6 @@ func TestCatalogWalkError(t *testing.T) { t.Errorf("Expected catalog driver list error") } } -<<<<<<< HEAD func BenchmarkPathCompareEqual(B *testing.B) { B.StopTimer() @@ -323,5 +323,3 @@ func randomFilename(length int64) string { } return string(b) } -======= ->>>>>>> 27bd92bd (fix bug in catalog last param and optimized it)