cleaning up some dead code and fixing memorystore consistency

Signed-off-by: David Lawrence <david.lawrence@docker.com> (github: endophage)

tuf/client/client.go

@@ -6,7 +6,6 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
-	"io"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/notary"
@@ -541,18 +540,3 @@ func (c Client) TargetMeta(role, path string, excludeRoles ...string) (*data.Fil
 	}
 	return meta, ""
 }
-
-// DownloadTarget downloads the target to dst from the remote
-func (c Client) DownloadTarget(dst io.Writer, path string, meta *data.FileMeta) error {
-	reader, err := c.remote.GetTarget(path)
-	if err != nil {
-		return err
-	}
-	defer reader.Close()
-	r := io.TeeReader(
-		io.LimitReader(reader, meta.Length),
-		dst,
-	)
-	err = utils.ValidateTarget(r, meta)
-	return err
-}

tuf/store/interfaces.go

@@ -1,8 +1,6 @@
 package store
 
 import (
-	"io"
-
 	"github.com/docker/notary/tuf/data"
 )
 
@@ -23,17 +21,9 @@ type PublicKeyStore interface {
 	GetKey(role string) ([]byte, error)
 }
 
-// TargetStore represents a collection of targets that can be walked similarly
-// to walking a directory, passing a callback that receives the path and meta
-// for each target
-type TargetStore interface {
-	WalkStagedTargets(paths []string, targetsFn targetsWalkFunc) error
-}
-
 // LocalStore represents a local TUF sture
 type LocalStore interface {
 	MetadataStore
-	TargetStore
 }
 
 // RemoteStore is similar to LocalStore with the added expectation that it should
@@ -41,5 +31,4 @@ type LocalStore interface {
 type RemoteStore interface {
 	MetadataStore
 	PublicKeyStore
-	GetTarget(path string) (io.ReadCloser, error)
 }

tuf/store/memorystore.go

@@ -1,10 +1,8 @@
 package store
 
 import (
-	"bytes"
 	"crypto/sha256"
 	"fmt"
-	"io"
 
 	"github.com/docker/notary"
 	"github.com/docker/notary/tuf/data"
@@ -45,7 +43,10 @@ type MemoryStore struct {
 	keys       map[string][]data.PrivateKey
 }
 
+// GetMeta returns up to size bytes of data references by name.
 // If size is -1, this corresponds to "infinite," but we cut off at 100MB
+// as we will always know the size for everything but a timestamp and
+// sometimes a root, neither of which should be exceptionally large
 func (m *MemoryStore) GetMeta(name string, size int64) ([]byte, error) {
 	d, ok := m.meta[name]
 	if ok {
@@ -67,6 +68,7 @@ func (m *MemoryStore) GetMeta(name string, size int64) ([]byte, error) {
 	return nil, ErrMetaNotFound{Resource: name}
 }
 
+// SetMeta sets the metadata value for the given name
 func (m *MemoryStore) SetMeta(name string, meta []byte) error {
 	m.meta[name] = meta
 
@@ -76,6 +78,8 @@ func (m *MemoryStore) SetMeta(name string, meta []byte) error {
 	return nil
 }
 
+// SetMultiMeta sets multiple pieces of metadata for multiple names
+// in a single operation.
 func (m *MemoryStore) SetMultiMeta(metas map[string][]byte) error {
 	for role, blob := range metas {
 		m.SetMeta(role, blob)
@@ -86,56 +90,22 @@ func (m *MemoryStore) SetMultiMeta(metas map[string][]byte) error {
 // RemoveMeta removes the metadata for a single role - if the metadata doesn't
 // exist, no error is returned
 func (m *MemoryStore) RemoveMeta(name string) error {
+	if meta, ok := m.meta[name]; ok {
+		checksum := sha256.Sum256(meta)
+		path := utils.URLFilePath(name, checksum[:], true)
 		delete(m.meta, name)
-	return nil
-}
-
-func (m *MemoryStore) GetTarget(path string) (io.ReadCloser, error) {
-	return &utils.NoopCloser{Reader: bytes.NewReader(m.files[path])}, nil
-}
-
-func (m *MemoryStore) WalkStagedTargets(paths []string, targetsFn targetsWalkFunc) error {
-	if len(paths) == 0 {
-		for path, dat := range m.files {
-			meta, err := data.NewFileMeta(bytes.NewReader(dat), "sha256")
-			if err != nil {
-				return err
-			}
-			if err = targetsFn(path, meta); err != nil {
-				return err
-			}
-		}
-		return nil
-	}
-
-	for _, path := range paths {
-		dat, ok := m.files[path]
-		if !ok {
-			return ErrMetaNotFound{Resource: path}
-		}
-		meta, err := data.NewFileMeta(bytes.NewReader(dat), "sha256")
-		if err != nil {
-			return err
-		}
-		if err = targetsFn(path, meta); err != nil {
-			return err
-		}
+		delete(m.consistent, path)
 	}
 	return nil
 }
 
-func (m *MemoryStore) Commit(map[string][]byte, bool, map[string]data.Hashes) error {
-	return nil
-}
-
+// GetKey returns the public key for the given role
 func (m *MemoryStore) GetKey(role string) ([]byte, error) {
 	return nil, fmt.Errorf("GetKey is not implemented for the MemoryStore")
 }
 
-// Clear this existing memory store by setting this store as new empty one
+// RemoveAll clears the existing memory store by setting this store as new empty one
 func (m *MemoryStore) RemoveAll() error {
-	m.meta = make(map[string][]byte)
-	m.files = make(map[string][]byte)
-	m.keys = make(map[string][]data.PrivateKey)
+	*m = *NewMemoryStore(nil, nil)
 	return nil
 }

tuf/testutils/corrupt_memorystore.go

@@ -9,11 +9,15 @@ type CorruptingMemoryStore struct {
 	store.MemoryStore
 }
 
+// NewCorruptingMemoryStore returns a new instance of memory store that
+// corrupts all data requested from it.
 func NewCorruptingMemoryStore(meta map[string][]byte, files map[string][]byte) *CorruptingMemoryStore {
 	s := store.NewMemoryStore(meta, files)
 	return &CorruptingMemoryStore{MemoryStore: *s}
 }
 
+// GetMeta returns up to size bytes of meta identified by string. It will
+// always be corrupted by setting the first character to }
 func (cm CorruptingMemoryStore) GetMeta(name string, size int64) ([]byte, error) {
 	d, err := cm.MemoryStore.GetMeta(name, size)
 	if err != nil {