func (x *singleReader) Read(p []byte) (int, error) {
r := x.r
if r.seq != x.seq {
return 0, errors.New("leveldb/journal: stale reader")
}
if x.err != nil {
return 0, x.err
}
if r.err != nil {
return 0, r.err
}
for r.i == r.j {
if r.last {
return 0, io.EOF
}
x.err = r.nextChunk(false)
if x.err != nil {
if x.err == errSkip {
x.err = io.ErrUnexpectedEOF
}
return 0, x.err
}
}
n := copy(p, r.buf[r.i:r.j])
r.i += n
return n, nil
}
func (x singleWriter) Write(p []byte) (int, error) {
w := x.w
if w.seq != x.seq {
return 0, errors.New("leveldb/journal: stale writer")
}
if w.err != nil {
return 0, w.err
}
n0 := len(p)
for len(p) > 0 {
// Write a block, if it is full.
if w.j == blockSize {
w.fillHeader(false)
w.writeBlock()
if w.err != nil {
return 0, w.err
}
w.first = false
}
// Copy bytes into the buffer.
n := copy(w.buf[w.j:], p)
w.j += n
p = p[n:]
}
return n0, nil
}
func (x *singleReader) ReadByte() (byte, error) {
r := x.r
if r.seq != x.seq {
return 0, errors.New("leveldb/journal: stale reader")
}
if x.err != nil {
return 0, x.err
}
if r.err != nil {
return 0, r.err
}
for r.i == r.j {
if r.last {
return 0, io.EOF
}
x.err = r.nextChunk(false)
if x.err != nil {
if x.err == errSkip {
x.err = io.ErrUnexpectedEOF
}
return 0, x.err
}
}
c := r.buf[r.i]
r.i++
return c, nil
}
func (r *Reader) readFilterBlockCached(bh blockHandle, fillCache bool) (*filterBlock, util.Releaser, error) {
if r.cache != nil {
var (
err error
ch *cache.Handle
)
if fillCache {
ch = r.cache.Get(bh.offset, func() (size int, value cache.Value) {
var b *filterBlock
b, err = r.readFilterBlock(bh)
if err != nil {
return 0, nil
}
return cap(b.data), b
})
} else {
ch = r.cache.Get(bh.offset, nil)
}
if ch != nil {
b, ok := ch.Value().(*filterBlock)
if !ok {
ch.Release()
return nil, nil, errors.New("leveldb/table: inconsistent block type")
}
return b, ch, err
} else if err != nil {
return nil, nil, err
}
}
b, err := r.readFilterBlock(bh)
return b, b, err
}
// Close finishes the current journal and closes the writer.
func (w *Writer) Close() error {
w.seq++
w.writePending()
if w.err != nil {
return w.err
}
w.err = errors.New("leveldb/journal: closed Writer")
return nil
}
func (r *Reader) newBlockIter(b *block, bReleaser util.Releaser, slice *util.Range, inclLimit bool) *blockIter {
bi := &blockIter{
tr: r,
block: b,
blockReleaser: bReleaser,
// Valid key should never be nil.
key: make([]byte, 0),
dir: dirSOI,
riStart: 0,
riLimit: b.restartsLen,
offsetStart: 0,
offsetRealStart: 0,
offsetLimit: b.restartsOffset,
}
if slice != nil {
if slice.Start != nil {
if bi.Seek(slice.Start) {
bi.riStart = b.restartIndex(bi.restartIndex, b.restartsLen, bi.prevOffset)
bi.offsetStart = b.restartOffset(bi.riStart)
bi.offsetRealStart = bi.prevOffset
} else {
bi.riStart = b.restartsLen
bi.offsetStart = b.restartsOffset
bi.offsetRealStart = b.restartsOffset
}
}
if slice.Limit != nil {
if bi.Seek(slice.Limit) && (!inclLimit || bi.Next()) {
bi.offsetLimit = bi.prevOffset
bi.riLimit = bi.restartIndex + 1
}
}
bi.reset()
if bi.offsetStart > bi.offsetLimit {
bi.sErr(errors.New("leveldb/table: invalid slice range"))
}
}
return bi
}
func (r *lockedSource) Int63() (n int64) {
r.lk.Lock()
n = r.src.Int63()
r.lk.Unlock()
return
}
func (r *lockedSource) Seed(seed int64) {
r.lk.Lock()
r.src.Seed(seed)
r.lk.Unlock()
}
var (
ErrNotFound = errors.ErrNotFound
ErrIterReleased = errors.New("leveldb/memdb: iterator released")
rnd = rand.New(&lockedSource{
src: rand.NewSource(0xdeadbeef),
})
)
const tMaxHeight = 12
type dbIter struct {
util.BasicReleaser
p *DB
slice *util.Range
node int
forward bool
key, value []byte
err error
}
// NewReader returns a new reader. The dropper may be nil, and if
// strict is true then corrupted or invalid chunk will halt the journal
// reader entirely.
func NewReader(r io.Reader, dropper Dropper, strict, checksum bool) *Reader {
return &Reader{
r: r,
dropper: dropper,
strict: strict,
checksum: checksum,
last: true,
}
}
var errSkip = errors.New("leveldb/journal: skipped")
func (r *Reader) corrupt(n int, reason string, skip bool) error {
if r.dropper != nil {
r.dropper.Drop(&ErrCorrupted{n, reason})
}
if r.strict && !skip {
r.err = errors.NewErrCorrupted(storage.FileDesc{}, &ErrCorrupted{n, reason})
return r.err
}
return errSkip
}
// nextChunk sets r.buf[r.i:r.j] to hold the next chunk's payload, reading the
// next block into the buffer if necessary.
func (r *Reader) nextChunk(first bool) error {
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package leveldb
import (
"sync"
"time"
"github.com/pingcap/goleveldb/leveldb/errors"
"github.com/pingcap/goleveldb/leveldb/opt"
"github.com/pingcap/goleveldb/leveldb/storage"
)
var (
errCompactionTransactExiting = errors.New("leveldb: compaction transact exiting")
)
type cStat struct {
duration time.Duration
read int64
write int64
}
func (p *cStat) add(n *cStatStaging) {
p.duration += n.duration
p.read += n.read
p.write += n.write
}
func (p *cStat) get() (duration time.Duration, read, write int64) {
// NewReader creates a new initialized table reader for the file.
// The fi, cache and bpool is optional and can be nil.
//
// The returned table reader instance is goroutine-safe.
func NewReader(f io.ReaderAt, size int64, fd storage.FileDesc, cache *cache.NamespaceGetter, bpool *util.BufferPool, o *opt.Options) (*Reader, error) {
if f == nil {
return nil, errors.New("leveldb/table: nil file")
}
r := &Reader{
fd: fd,
reader: f,
cache: cache,
bpool: bpool,
o: o,
cmp: o.GetComparer(),
verifyChecksum: o.GetStrict(opt.StrictBlockChecksum),
}
if size < footerLen {
r.err = r.newErrCorrupted(0, size, "table", "too small")
return r, nil
}
footerPos := size - footerLen
var footer [footerLen]byte
if _, err := r.reader.ReadAt(footer[:], footerPos); err != nil && err != io.EOF {
return nil, err
}
if string(footer[footerLen-len(magic):footerLen]) != magic {
r.err = r.newErrCorrupted(footerPos, footerLen, "table-footer", "bad magic number")
return r, nil
}
var n int
// Decode the metaindex block handle.
r.metaBH, n = decodeBlockHandle(footer[:])
if n == 0 {
r.err = r.newErrCorrupted(footerPos, footerLen, "table-footer", "bad metaindex block handle")
return r, nil
}
// Decode the index block handle.
r.indexBH, n = decodeBlockHandle(footer[n:])
if n == 0 {
r.err = r.newErrCorrupted(footerPos, footerLen, "table-footer", "bad index block handle")
return r, nil
}
// Read metaindex block.
metaBlock, err := r.readBlock(r.metaBH, true)
if err != nil {
if errors.IsCorrupted(err) {
r.err = err
return r, nil
} else {
return nil, err
}
}
// Set data end.
r.dataEnd = int64(r.metaBH.offset)
// Read metaindex.
metaIter := r.newBlockIter(metaBlock, nil, nil, true)
for metaIter.Next() {
key := string(metaIter.Key())
if !strings.HasPrefix(key, "filter.") {
continue
}
fn := key[7:]
if f0 := o.GetFilter(); f0 != nil && f0.Name() == fn {
r.filter = f0
} else {
for _, f0 := range o.GetAltFilters() {
if f0.Name() == fn {
r.filter = f0
break
}
}
}
if r.filter != nil {
filterBH, n := decodeBlockHandle(metaIter.Value())
if n == 0 {
continue
}
r.filterBH = filterBH
// Update data end.
r.dataEnd = int64(filterBH.offset)
break
}
}
metaIter.Release()
metaBlock.Release()
// Cache index and filter block locally, since we don't have global cache.
if cache == nil {
r.indexBlock, err = r.readBlock(r.indexBH, true)
if err != nil {
if errors.IsCorrupted(err) {
r.err = err
return r, nil
} else {
return nil, err
}
}
if r.filter != nil {
r.filterBlock, err = r.readFilterBlock(r.filterBH)
if err != nil {
if !errors.IsCorrupted(err) {
return nil, err
}
// Don't use filter then.
r.filter = nil
}
}
}
return r, nil
}
"github.com/golang/snappy"
"github.com/pingcap/goleveldb/leveldb/cache"
"github.com/pingcap/goleveldb/leveldb/comparer"
"github.com/pingcap/goleveldb/leveldb/errors"
"github.com/pingcap/goleveldb/leveldb/filter"
"github.com/pingcap/goleveldb/leveldb/iterator"
"github.com/pingcap/goleveldb/leveldb/opt"
"github.com/pingcap/goleveldb/leveldb/storage"
"github.com/pingcap/goleveldb/leveldb/util"
)
var (
ErrNotFound = errors.ErrNotFound
ErrReaderReleased = errors.New("leveldb/table: reader released")
ErrIterReleased = errors.New("leveldb/table: iterator released")
)
type ErrCorrupted struct {
Pos int64
Size int64
Kind string
Reason string
}
func (e *ErrCorrupted) Error() string {
return fmt.Sprintf("leveldb/table: corruption on %s (pos=%d): %s", e.Kind, e.Pos, e.Reason)
}
func max(x, y int) int {
// Copyright (c) 2014, Suryandaru Triandana <*****@*****.**>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package leveldb
import (
"github.com/pingcap/goleveldb/leveldb/errors"
)
var (
ErrNotFound = errors.ErrNotFound
ErrReadOnly = errors.New("leveldb: read-only mode")
ErrSnapshotReleased = errors.New("leveldb: snapshot released")
ErrIterReleased = errors.New("leveldb: iterator released")
ErrClosed = errors.New("leveldb: closed")
)