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 (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
}
// 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
}
// GetProperty returns value of the given property name.
//
// Property names:
// leveldb.num-files-at-level{n}
// Returns the number of files at level 'n'.
// leveldb.stats
// Returns statistics of the underlying DB.
// leveldb.sstables
// Returns sstables list for each level.
// leveldb.blockpool
// Returns block pool stats.
// leveldb.cachedblock
// Returns size of cached block.
// leveldb.openedtables
// Returns number of opened tables.
// leveldb.alivesnaps
// Returns number of alive snapshots.
// leveldb.aliveiters
// Returns number of alive iterators.
func (db *DB) GetProperty(name string) (value string, err error) {
err = db.ok()
if err != nil {
return
}
const prefix = "leveldb."
if !strings.HasPrefix(name, prefix) {
return "", errors.New("leveldb: GetProperty: unknown property: " + name)
}
p := name[len(prefix):]
v := db.s.version()
defer v.release()
numFilesPrefix := "num-files-at-level"
switch {
case strings.HasPrefix(p, numFilesPrefix):
var level uint
var rest string
n, _ := fmt.Sscanf(p[len(numFilesPrefix):], "%d%s", &level, &rest)
if n != 1 || int(level) >= db.s.o.GetNumLevel() {
err = errors.New("leveldb: GetProperty: invalid property: " + name)
} else {
value = fmt.Sprint(v.tLen(int(level)))
}
case p == "stats":
value = "Compactions\n" +
" Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)\n" +
"-------+------------+---------------+---------------+---------------+---------------\n"
for level, tables := range v.tables {
duration, read, write := db.compStats[level].get()
if len(tables) == 0 && duration == 0 {
continue
}
value += fmt.Sprintf(" %3d | %10d | %13.5f | %13.5f | %13.5f | %13.5f\n",
level, len(tables), float64(tables.size())/1048576.0, duration.Seconds(),
float64(read)/1048576.0, float64(write)/1048576.0)
}
case p == "sstables":
for level, tables := range v.tables {
value += fmt.Sprintf("--- level %d ---\n", level)
for _, t := range tables {
value += fmt.Sprintf("%d:%d[%q .. %q]\n", t.file.Num(), t.size, t.imin, t.imax)
}
}
case p == "blockpool":
value = fmt.Sprintf("%v", db.s.tops.bpool)
case p == "cachedblock":
if db.s.tops.bcache != nil {
value = fmt.Sprintf("%d", db.s.tops.bcache.Size())
} else {
value = "<nil>"
}
case p == "openedtables":
value = fmt.Sprintf("%d", db.s.tops.cache.Size())
case p == "alivesnaps":
value = fmt.Sprintf("%d", atomic.LoadInt32(&db.aliveSnaps))
case p == "aliveiters":
value = fmt.Sprintf("%d", atomic.LoadInt32(&db.aliveIters))
default:
err = errors.New("leveldb: GetProperty: unknown property: " + name)
}
return
}
// 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/rwcarlsen/cloudlus/Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/errors"
"github.com/rwcarlsen/cloudlus/Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/memdb"
"github.com/rwcarlsen/cloudlus/Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/opt"
)
var (
errCompactionTransactExiting = errors.New("leveldb: compaction transact exiting")
)
type cStats struct {
sync.Mutex
duration time.Duration
read uint64
write uint64
}
func (p *cStats) add(n *cStatsStaging) {
p.Lock()
p.duration += n.duration
p.read += n.read
p.write += n.write
p.Unlock()
}
// 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(nil, &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 {