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store.go
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store.go
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// Copyright 2021 The June Authors. All rights reserved.
// Use of this source code is governed by Apache License
// that can be found in the LICENSE file.
package storekv
import (
"bytes"
"context"
"fmt"
"io"
"github.com/reusee/e5"
"github.com/reusee/june/key"
"github.com/reusee/june/opts"
"github.com/reusee/june/store"
"github.com/reusee/sb"
)
func (s *Store) ID() (StoreID, error) {
return s.getID()
}
func (s *Store) Exists(key Key) (bool, error) {
path := s.keyToPath(key)
return s.kv.KeyExists(path)
}
func (s *Store) IterAllKeys(fn func(Key) error) error {
return s.kv.KeyIter(s.objPrefix(), func(k string) error {
key, err := s.pathToKey(k)
if err != nil {
// ignore
return nil
}
return fn(key)
})
}
var shards = func() []string {
var ret []string
for i := 0; i < 256; i++ {
ret = append(ret, fmt.Sprintf("%02x", i))
}
return ret
}()
func (s *Store) IterKeys(ns key.Namespace, fn func(Key) error) error {
nsPrefix := s.nsPrefix(ns)
ctx, cancel := context.WithCancel(s.wg)
defer cancel()
keys := make(chan *Key)
errCh := make(chan error, 1)
setErr := func(err error) {
select {
case errCh <- err:
default:
}
}
go func() {
sem := make(chan struct{}, s.parallel)
loop:
for _, shard := range shards {
shard := shard
select {
case sem <- struct{}{}:
case <-ctx.Done():
break loop
}
go func() {
defer func() {
<-sem
}()
prefix := nsPrefix + shard
if err := s.kv.KeyIter(prefix, func(k string) error {
key, err := s.pathToKey(k)
if err != nil {
// ignore
return nil
}
if key.Namespace != ns {
return nil
}
select {
case keys <- &key:
case <-ctx.Done():
return Break
}
return nil
}); err != nil {
setErr(err)
return
}
}()
}
for i := 0; i < cap(sem); i++ {
sem <- struct{}{}
}
close(keys)
}()
defer func() {
// wait close
<-keys
}()
loop:
for {
select {
case key := <-keys:
if key == nil {
break loop
}
if err := fn(*key); is(err, store.Break) {
break loop
} else if err != nil {
return err
}
case err := <-errCh:
return err
}
}
select {
case err := <-errCh:
return err
default:
}
return nil
}
func (s *Store) Read(key Key, fn func(sb.Stream) error) error {
// cache
if s.cache != nil {
if err := s.cache.CacheGet(key, func(stream sb.Stream) (err error) {
defer he(&err)
// cache hit, check exists
exists, err := s.Exists(key)
ce(err)
if !exists {
return we.With(e5.With(key))(ErrKeyNotFound)
}
err = fn(stream)
ce(err, e5.With(ErrRead), e5.With(key))
return nil
}); is(err, ErrKeyNotFound) {
// skip
} else if err != nil {
return err
} else {
return nil
}
}
path := s.keyToPath(key)
return s.kv.KeyGet(path, func(r io.Reader) (err error) {
defer he(&err)
var tokens sb.Tokens
var sum []byte
if len(s.offloads) > 0 {
// offload
if err := sb.Copy(
sb.Deref(
s.codec.Decode(sb.Decode(r)),
func(value []byte) (sb.Stream, error) {
if !bytes.Equal(value, []byte("offloaded")) {
return nil, nil
}
for _, offload := range s.offloads {
offloadStore := offload(key, -1)
if offloadStore == nil {
continue
}
var offloadTokens sb.Tokens
err := offloadStore.Read(key, func(s sb.Stream) error {
return sb.Copy(
s,
sb.CollectTokens(&offloadTokens),
)
})
if is(err, ErrKeyNotFound) {
continue
}
ce(err)
return offloadTokens.Iter(), nil
}
return nil, nil
},
),
sb.CollectTokens(&tokens),
sb.Hash(s.newHashState, &sum, nil),
); err != nil {
return err
}
} else {
if err := sb.Copy(
s.codec.Decode(sb.Decode(r)),
sb.CollectTokens(&tokens),
sb.Hash(s.newHashState, &sum, nil),
); err != nil {
return err
}
}
if !bytes.Equal(key.Hash[:], sum) {
return we.With(e5.With(key))(ErrKeyNotMatch)
}
err = fn(tokens.Iter())
ce(err, e5.With(ErrRead), e5.With(key))
return nil
})
}
func (s *Store) Write(
ns key.Namespace,
stream sb.Stream,
options ...WriteOption,
) (res store.WriteResult, err error) {
defer he(&err)
var tapKey TapKey
var tapResult TapWriteResult
var newBytesBuffer opts.NewBytesBuffer
for _, option := range options {
switch option := option.(type) {
case TapKey:
tapKey = option
case TapWriteResult:
tapResult = option
case opts.NewBytesBuffer:
newBytesBuffer = option
}
}
defer func() {
if err == nil && tapResult != nil {
tapResult(res)
}
}()
var hash []byte
var tokens sb.Tokens
var encodedLen int
if err = sb.Copy(
stream,
sb.Hash(s.newHashState, &hash, nil),
sb.CollectTokens(&tokens),
sb.EncodedLen(&encodedLen, nil),
); err != nil {
return
}
copy(res.Key.Hash[:], hash)
res.Key.Namespace = ns
if tapKey != nil {
tapKey(res.Key)
}
// put cache
if s.cache != nil && len(tokens) > 0 {
err := s.cache.CachePut(res.Key, tokens, store.EncodedLen(encodedLen))
ce(err)
}
path := s.keyToPath(res.Key)
if s.costInfo.Exists <= s.costInfo.Put {
var ok bool
ok, err = s.kv.KeyExists(path)
ce(err)
if ok {
return
}
}
// offload
offloaded := false
if len(s.offloads) > 0 {
for _, offload := range s.offloads {
offloadStore := offload(res.Key, encodedLen)
if offloadStore == nil {
continue
}
offloaded = true
result, e := offloadStore.Write(ns, tokens.Iter(), options...)
ce(e)
if result.Key != res.Key {
err = we(ErrKeyNotMatch)
return
}
}
}
buf := new(bytes.Buffer)
var sink sb.Sink
if newBytesBuffer != nil {
sink = s.codec.Encode(
sb.Encode(buf),
newBytesBuffer,
)
} else {
sink = s.codec.Encode(
sb.Encode(buf),
)
}
var src sb.Stream
if offloaded {
src = sb.Tokens{
{
Kind: sb.KindRef,
Value: []byte("offloaded"),
},
}.Iter()
} else {
src = tokens.Iter()
}
if err = sb.Copy(
src,
sink,
); err != nil {
return
}
res.BytesWritten += int64(buf.Len())
err = s.kv.KeyPut(path, buf)
ce(err)
res.Written = true
return
}
func (s *Store) Delete(keys []Key) error {
var paths []string
for _, key := range keys {
paths = append(paths, s.keyToPath(key))
}
return s.kv.KeyDelete(paths...)
}