Feature/local storage cache

cli/server.go

@@ -23,10 +23,11 @@ import (
 
 func server() *cobra.Command {
 var (
-address string
-artifactory string
-extdir string
-repo string
+address string
+artifactory string
+extdir string
+repo string
+listcacheduration time.Duration
 )
 
 cmd := &cobra.Command{
@@ -53,10 +54,11 @@ func server() *cobra.Command {
 }
 
 store, err := storage.NewStorage(ctx, &storage.Options{
-Artifactory: artifactory,
-ExtDir: extdir,
-Logger: logger,
-Repo: repo,
+Artifactory: artifactory,
+ExtDir: extdir,
+Logger: logger,
+Repo: repo,
+ListCacheDuration: listcacheduration,
 })
 if err != nil {
 return err
@@ -137,6 +139,7 @@ func server() *cobra.Command {
 cmd.Flags().StringVar(&artifactory, "artifactory", "", "Artifactory server URL.")
 cmd.Flags().StringVar(&repo, "repo", "", "Artifactory repository.")
 cmd.Flags().StringVar(&address, "address", "127.0.0.1:3001", "The address on which to serve the marketplace API.")
+cmd.Flags().DurationVar(&listcacheduration, "list-cache-duration", time.Minute, "The duration of the extension cache.")
 
 return cmd
 }

storage/artifactory.go

@@ -333,13 +333,6 @@ func (s *Artifactory) RemoveExtension(ctx context.Context, publisher, name strin
 return err
 }
 
-type extension struct {
-manifest *VSIXManifest
-name string
-publisher string
-versions []Version
-}
-
 func (s *Artifactory) listWithCache(ctx context.Context) *[]ArtifactoryFile {
 s.listMutex.Lock()
 defer s.listMutex.Unlock()

storage/local.go

@@ -8,6 +8,8 @@ import (
 "os"
 "path/filepath"
 "sort"
+"sync"
+"time"
 
 "cdr.dev/slog"
 )
@@ -16,21 +18,77 @@ import (
 // copying the VSIX and extracting said VSIX to a tree structure in the form of
 // publisher/extension/version to easily serve individual assets via HTTP.
 type Local struct {
-extdir string
-logger slog.Logger
+listCache []extension
+listDuration time.Duration
+listExpiration time.Time
+listMutex sync.Mutex
+extdir string
+logger slog.Logger
 }
 
-func NewLocalStorage(extdir string, logger slog.Logger) (*Local, error) {
-extdir, err := filepath.Abs(extdir)
+type LocalOptions struct {
+// How long to cache the list of extensions with their manifests. Zero means 
+// no cache.
+ListCacheDuration time.Duration
+ExtDir string
+}
+
+func NewLocalStorage(options *LocalOptions, logger slog.Logger) (*Local, error) {
+extdir, err := filepath.Abs(options.ExtDir)
 if err != nil {
 return nil, err
 }
 return &Local{
-extdir: extdir,
-logger: logger,
+// TODO: Eject the cache when adding/removing extensions and/or add a
+// command to eject the cache?
+extdir: extdir,
+listDuration: options.ListCacheDuration,
+logger: logger,
 }, nil
 }
 
+func (s *Local) list(ctx context.Context) []extension {
+var list []extension
+publishers, err := s.getDirNames(ctx, s.extdir)
+if err != nil {
+s.logger.Error(ctx, "Error reading publisher", slog.Error(err))
+}
+for _, publisher := range publishers {
+ctx := slog.With(ctx, slog.F("publisher", publisher))
+dir := filepath.Join(s.extdir, publisher)
+
+extensions, err := s.getDirNames(ctx, dir)
+if err != nil {
+s.logger.Error(ctx, "Error reading extensions", slog.Error(err))
+}
+for _, name := range extensions {
+ctx := slog.With(ctx, slog.F("extension", name))
+versions, err := s.Versions(ctx, publisher, name)
+if err != nil {
+s.logger.Error(ctx, "Error reading versions", slog.Error(err))
+}
+if len(versions) == 0 {
+continue
+}
+
+// The manifest from the latest version is used for filtering.
+manifest, err := s.Manifest(ctx, publisher, name, versions[0])
+if err != nil {
+s.logger.Error(ctx, "Unable to read extension manifest", slog.Error(err))
+continue
+}
+
+list = append(list, extension{
+manifest,
+name,
+publisher,
+versions,
+})
+}
+}
+return list
+}
+
 func (s *Local) AddExtension(ctx context.Context, manifest *VSIXManifest, vsix []byte) (string, error) {
 // Extract the zip to the correct path.
 identity := manifest.Metadata.Identity
@@ -118,39 +176,23 @@ func (s *Local) Versions(ctx context.Context, publisher, name string) ([]Version
 return versions, err
 }
 
-func (s *Local) WalkExtensions(ctx context.Context, fn func(manifest *VSIXManifest, versions []Version) error) error {
-publishers, err := s.getDirNames(ctx, s.extdir)
-if err != nil {
-s.logger.Error(ctx, "Error reading publisher", slog.Error(err))
+func (s *Local) listWithCache(ctx context.Context) []extension {
+s.listMutex.Lock()
+defer s.listMutex.Unlock()
+if s.listCache == nil || time.Now().After(s.listExpiration) {
+s.listExpiration = time.Now().Add(s.listDuration)
+s.listCache = s.list(ctx)
 }
-for _, publisher := range publishers {
-ctx := slog.With(ctx, slog.F("publisher", publisher))
-dir := filepath.Join(s.extdir, publisher)
-
-extensions, err := s.getDirNames(ctx, dir)
-if err != nil {
-s.logger.Error(ctx, "Error reading extensions", slog.Error(err))
-}
-for _, extension := range extensions {
-ctx := slog.With(ctx, slog.F("extension", extension))
-versions, err := s.Versions(ctx, publisher, extension)
-if err != nil {
-s.logger.Error(ctx, "Error reading versions", slog.Error(err))
-}
-if len(versions) == 0 {
-continue
-}
-
-// The manifest from the latest version is used for filtering.
-manifest, err := s.Manifest(ctx, publisher, extension, versions[0])
-if err != nil {
-s.logger.Error(ctx, "Unable to read extension manifest", slog.Error(err))
-continue
-}
+return s.listCache
+}
 
-if err = fn(manifest, versions); err != nil {
-return err
-}
+func (s *Local) WalkExtensions(ctx context.Context, fn func(manifest *VSIXManifest, versions []Version) error) error {
+// Walking through directories on disk and parsing manifest files takes several
+// minutes with many extensions installed, so if we already did that within
+// a specified duration, just load extensions from the cache instead.
+for _, extension := range s.listWithCache(ctx) {
+if err := fn(extension.manifest, extension.versions); err != nil {
+return err
 }
 }
 return nil

storage/local_test.go

@@ -15,7 +15,7 @@ import (
 func localFactory(t *testing.T) testStorage {
 extdir := t.TempDir()
 logger := slogtest.Make(t, &slogtest.Options{IgnoreErrors: true}).Leveled(slog.LevelDebug)
-s, err := storage.NewLocalStorage(extdir, logger)
+s, err := storage.NewLocalStorage(&storage.LocalOptions{ExtDir: extdir}, logger)
 require.NoError(t, err)
 return testStorage{
 storage: s,

storage/storage.go

@@ -123,10 +123,18 @@ type VSIXAsset struct {
 }
 
 type Options struct {
-Artifactory string
-ExtDir string
-Repo string
-Logger slog.Logger
+Artifactory string
+ExtDir string
+Repo string
+Logger slog.Logger
+ListCacheDuration time.Duration
+}
+
+type extension struct {
+manifest *VSIXManifest
+name string
+publisher string
+versions []Version
 }
 
 // Version is a subset of database.ExtVersion.
@@ -238,14 +246,17 @@ func NewStorage(ctx context.Context, options *Options) (Storage, error) {
 return nil, xerrors.Errorf("the %s environment variable must be set", ArtifactoryTokenEnvKey)
 }
 return NewArtifactoryStorage(ctx, &ArtifactoryOptions{
-ListCacheDuration: time.Minute,
+ListCacheDuration: options.ListCacheDuration,
 Logger: options.Logger,
 Repo: options.Repo,
 Token: token,
 URI: options.Artifactory,
 })
 } else if options.ExtDir != "" {
-return NewLocalStorage(options.ExtDir, options.Logger)
+return NewLocalStorage(&LocalOptions{
+ListCacheDuration: options.ListCacheDuration,
+ExtDir: options.ExtDir,
+}, options.Logger)
 }
 return nil, xerrors.Errorf("must provide an Artifactory repository or local directory")
 }