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stash.go
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stash.go
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package stash // import "a4.io/blobstash/pkg/stash"
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sync"
log "github.com/inconshreveable/log15"
"a4.io/blobstash/pkg/blob"
"a4.io/blobstash/pkg/blobstore"
"a4.io/blobstash/pkg/ctxutil"
"a4.io/blobstash/pkg/hub"
"a4.io/blobstash/pkg/kvstore"
"a4.io/blobstash/pkg/meta"
"a4.io/blobstash/pkg/stash/store"
"a4.io/blobstash/pkg/vkv"
)
type dataContext struct {
bs store.BlobStore
kvs store.KvStore
bsProxy store.BlobStore
kvsProxy store.KvStore
hub *hub.Hub
meta *meta.Meta
log log.Logger
dir string
root bool
closed bool
}
func (dc *dataContext) BlobStore() store.BlobStore {
return dc.bs
}
func (dc *dataContext) KvStore() store.KvStore {
return dc.kvs
}
func (dc *dataContext) BlobStoreProxy() store.BlobStore {
return dc.bsProxy
}
func (dc *dataContext) KvStoreProxy() store.KvStore {
return dc.kvsProxy
}
func (dc *dataContext) Closed() bool {
return dc.closed
}
func (dc *dataContext) Merge(ctx context.Context) error {
if dc.root {
return nil
}
blobs, _, err := dc.bs.Enumerate(ctx, "", "\xff", 0)
if err != nil {
return err
}
for _, blobRef := range blobs {
data, err := dc.bs.Get(ctx, blobRef.Hash)
if err != nil {
return err
}
b := &blob.Blob{Hash: blobRef.Hash, Data: data}
if _, err := dc.bsProxy.(*store.BlobStoreProxy).ReadSrc.Put(ctx, b); err != nil {
return err
}
}
return nil
}
func (dc *dataContext) Close() error {
if dc.closed || dc.root {
return nil
}
// TODO(tsileo): multi error
if err := dc.kvs.Close(); err != nil {
return err
}
if err := dc.bs.Close(); err != nil {
return err
}
dc.closed = true
return nil
}
func (dc *dataContext) Destroy() error {
if dc.root {
return nil
}
if err := dc.Close(); err != nil {
return err
}
// TODO(tsileo): only call Destroy from Stash and unexport this one, also remove from index
return os.RemoveAll(dc.dir)
}
type Stash struct {
rootDataContext *dataContext
contexes map[string]*dataContext
path string
sync.Mutex
}
func (s *Stash) destroy(dataContext *dataContext, name string) error {
if dataContext.root {
return fmt.Errorf("cannot destroy the root data context")
}
delete(s.contexes, name)
if err := dataContext.Destroy(); err != nil {
return err
}
return nil
}
func New(dir string, m *meta.Meta, bs *blobstore.BlobStore, kvs *kvstore.KvStore, h *hub.Hub, l log.Logger) (*Stash, error) {
s := &Stash{
contexes: map[string]*dataContext{},
path: dir,
rootDataContext: &dataContext{
bs: bs,
kvs: kvs,
bsProxy: bs,
kvsProxy: kvs,
hub: h,
meta: m,
log: l,
root: true,
},
}
stashes, err := ioutil.ReadDir(dir)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
if err == nil {
for _, dir := range stashes {
if _, err := s.NewDataContext(dir.Name()); err != nil {
return nil, err
}
}
}
// FIXME(tsileo): BlobStore.Scan should be triggered here??, and for all available stashes
return s, nil
}
func (s *Stash) NewDataContext(name string) (*dataContext, error) {
s.Lock()
defer s.Unlock()
path := filepath.Join(s.path, name)
if _, err := os.Stat(path); os.IsNotExist(err) {
if err := os.MkdirAll(path, 0700); err != nil {
return nil, err
}
}
l := s.rootDataContext.log.New("data_ctx", name)
h := hub.New(l.New("app", "hub"), false)
m, err := meta.New(l.New("app", "meta"), h)
if err != nil {
return nil, err
}
// XXX(tsileo): use a dumb single file cache instead of the blobstore?
bsDst, err := blobstore.New(l.New("app", "blobstore"), false, path, nil, h)
if err != nil {
return nil, err
}
bs := &store.BlobStoreProxy{
BlobStore: bsDst,
ReadSrc: s.rootDataContext.bs,
}
kvsDst, err := kvstore.New(l.New("app", "kvstore"), path, bs, m)
if err != nil {
return nil, err
}
kvs := &store.KvStoreProxy{
KvStore: kvsDst,
ReadSrc: s.rootDataContext.kvs,
}
dataCtx := &dataContext{
log: l,
meta: m,
hub: h,
bs: bsDst,
kvs: kvsDst,
kvsProxy: kvs,
bsProxy: bs,
dir: path,
}
s.contexes[name] = dataCtx
return dataCtx, nil
}
func (s *Stash) Close() error {
s.rootDataContext.Close()
s.Lock()
defer s.Unlock()
for _, dc := range s.contexes {
dc.Close()
}
return nil
}
func (s *Stash) Root() store.DataContext {
return s.rootDataContext
}
func (s *Stash) DoAndDestroy(ctx context.Context, name string, do func(context.Context, store.DataContext) error) error {
s.Lock()
dc, ok := s.contexes[name]
if !ok {
s.Unlock()
return fmt.Errorf("data context not found")
}
s.Unlock()
if err := do(ctx, dc); err != nil {
return err
}
s.Lock()
defer s.Unlock()
if err := s.destroy(dc, name); err != nil {
return err
}
return nil
}
func (s *Stash) MergeAndDestroy(ctx context.Context, name string) error {
s.Lock()
defer s.Unlock()
dc, ok := s.contexes[name]
if !ok {
return fmt.Errorf("data context not found")
}
if err := dc.Merge(ctx); err != nil {
return err
}
if err := s.destroy(dc, name); err != nil {
return err
}
return nil
}
func (s *Stash) Destroy(ctx context.Context, name string) error {
s.Lock()
defer s.Unlock()
dc, ok := s.contexes[name]
if !ok {
return fmt.Errorf("data context not found")
}
if err := s.destroy(dc, name); err != nil {
return err
}
return nil
}
func (s *Stash) dataContext(ctx context.Context) (*dataContext, error) {
// TODO(tsileo): handle destroyed context
name, _ := ctxutil.Namespace(ctx)
if ctx, ok := s.DataContextByName(name); ok {
return ctx, nil
}
// If it does not exist, create it now
return s.NewDataContext(name)
}
func (s *Stash) ContextNames() []string {
s.Lock()
defer s.Unlock()
var out []string
for k, _ := range s.contexes {
out = append(out, k)
}
return out
}
func (s *Stash) DataContextByName(name string) (*dataContext, bool) {
if name == "" {
return s.rootDataContext, true
}
// FIXME(tsileo): fix the deadlock
s.Lock()
defer s.Unlock()
if dc, ok := s.contexes[name]; ok {
return dc, true
}
return nil, false
}
func (s *Stash) BlobStore() *BlobStore {
return &BlobStore{s}
}
func (s *Stash) KvStore() *KvStore {
return &KvStore{s}
}
type BlobStore struct {
s *Stash
}
func (bs *BlobStore) Close() error { return nil } // TODO(tsileo): check if no closing is needed?
func (bs *BlobStore) Put(ctx context.Context, blob *blob.Blob) (bool, error) {
dataContext, err := bs.s.dataContext(ctx)
if err != nil {
return false, err
}
return dataContext.BlobStoreProxy().Put(ctx, blob)
}
func (bs *BlobStore) Get(ctx context.Context, hash string) ([]byte, error) {
dataContext, err := bs.s.dataContext(ctx)
if err != nil {
return nil, err
}
return dataContext.BlobStoreProxy().Get(ctx, hash)
}
func (bs *BlobStore) Stat(ctx context.Context, hash string) (bool, error) {
dataContext, err := bs.s.dataContext(ctx)
if err != nil {
return false, err
}
return dataContext.BlobStoreProxy().Stat(ctx, hash)
}
func (bs *BlobStore) Enumerate(ctx context.Context, start, end string, limit int) ([]*blob.SizedBlobRef, string, error) {
dataContext, err := bs.s.dataContext(ctx)
if err != nil {
return nil, "", err
}
return dataContext.BlobStoreProxy().Enumerate(ctx, start, end, limit)
}
type KvStore struct {
s *Stash
}
func (kv *KvStore) Close() error { return nil }
func (kv *KvStore) Put(ctx context.Context, key, ref string, data []byte, version int64) (*vkv.KeyValue, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return nil, err
}
return dataContext.KvStoreProxy().Put(ctx, key, ref, data, version)
}
func (kv *KvStore) Get(ctx context.Context, key string, version int64) (*vkv.KeyValue, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return nil, err
}
return dataContext.KvStoreProxy().Get(ctx, key, version)
}
func (kv *KvStore) GetMetaBlob(ctx context.Context, key string, version int64) (string, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return "", err
}
return dataContext.KvStoreProxy().GetMetaBlob(ctx, key, version)
}
func (kv *KvStore) Versions(ctx context.Context, key, start string, limit int) (*vkv.KeyValueVersions, string, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return nil, "", err
}
return dataContext.KvStoreProxy().Versions(ctx, key, start, limit)
}
func (kv *KvStore) Keys(ctx context.Context, start, end string, limit int) ([]*vkv.KeyValue, string, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return nil, "", err
}
return dataContext.KvStoreProxy().Keys(ctx, start, end, limit)
}
func (kv *KvStore) ReverseKeys(ctx context.Context, start, end string, limit int) ([]*vkv.KeyValue, string, error) {
dataContext, err := kv.s.dataContext(ctx)
if err != nil {
return nil, "", err
}
return dataContext.KvStoreProxy().ReverseKeys(ctx, start, end, limit)
}