forked from Shiloh/githaven
b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
148 lines
3.7 KiB
Go
148 lines
3.7 KiB
Go
// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
|
|
// 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 (
|
|
"encoding/binary"
|
|
"fmt"
|
|
|
|
"github.com/syndtr/goleveldb/leveldb/errors"
|
|
"github.com/syndtr/goleveldb/leveldb/storage"
|
|
)
|
|
|
|
// ErrInternalKeyCorrupted records internal key corruption.
|
|
type ErrInternalKeyCorrupted struct {
|
|
Ikey []byte
|
|
Reason string
|
|
}
|
|
|
|
func (e *ErrInternalKeyCorrupted) Error() string {
|
|
return fmt.Sprintf("leveldb: internal key %q corrupted: %s", e.Ikey, e.Reason)
|
|
}
|
|
|
|
func newErrInternalKeyCorrupted(ikey []byte, reason string) error {
|
|
return errors.NewErrCorrupted(storage.FileDesc{}, &ErrInternalKeyCorrupted{append([]byte{}, ikey...), reason})
|
|
}
|
|
|
|
type keyType uint
|
|
|
|
func (kt keyType) String() string {
|
|
switch kt {
|
|
case keyTypeDel:
|
|
return "d"
|
|
case keyTypeVal:
|
|
return "v"
|
|
}
|
|
return "x"
|
|
}
|
|
|
|
// Value types encoded as the last component of internal keys.
|
|
// Don't modify; this value are saved to disk.
|
|
const (
|
|
keyTypeDel keyType = iota
|
|
keyTypeVal
|
|
)
|
|
|
|
// keyTypeSeek defines the keyType that should be passed when constructing an
|
|
// internal key for seeking to a particular sequence number (since we
|
|
// sort sequence numbers in decreasing order and the value type is
|
|
// embedded as the low 8 bits in the sequence number in internal keys,
|
|
// we need to use the highest-numbered ValueType, not the lowest).
|
|
const keyTypeSeek = keyTypeVal
|
|
|
|
const (
|
|
// Maximum value possible for sequence number; the 8-bits are
|
|
// used by value type, so its can packed together in single
|
|
// 64-bit integer.
|
|
keyMaxSeq = (uint64(1) << 56) - 1
|
|
// Maximum value possible for packed sequence number and type.
|
|
keyMaxNum = (keyMaxSeq << 8) | uint64(keyTypeSeek)
|
|
)
|
|
|
|
// Maximum number encoded in bytes.
|
|
var keyMaxNumBytes = make([]byte, 8)
|
|
|
|
func init() {
|
|
binary.LittleEndian.PutUint64(keyMaxNumBytes, keyMaxNum)
|
|
}
|
|
|
|
type internalKey []byte
|
|
|
|
func makeInternalKey(dst, ukey []byte, seq uint64, kt keyType) internalKey {
|
|
if seq > keyMaxSeq {
|
|
panic("leveldb: invalid sequence number")
|
|
} else if kt > keyTypeVal {
|
|
panic("leveldb: invalid type")
|
|
}
|
|
|
|
if n := len(ukey) + 8; cap(dst) < n {
|
|
dst = make([]byte, n)
|
|
} else {
|
|
dst = dst[:n]
|
|
}
|
|
copy(dst, ukey)
|
|
binary.LittleEndian.PutUint64(dst[len(ukey):], (seq<<8)|uint64(kt))
|
|
return internalKey(dst)
|
|
}
|
|
|
|
func parseInternalKey(ik []byte) (ukey []byte, seq uint64, kt keyType, err error) {
|
|
if len(ik) < 8 {
|
|
return nil, 0, 0, newErrInternalKeyCorrupted(ik, "invalid length")
|
|
}
|
|
num := binary.LittleEndian.Uint64(ik[len(ik)-8:])
|
|
seq, kt = uint64(num>>8), keyType(num&0xff)
|
|
if kt > keyTypeVal {
|
|
return nil, 0, 0, newErrInternalKeyCorrupted(ik, "invalid type")
|
|
}
|
|
ukey = ik[:len(ik)-8]
|
|
return
|
|
}
|
|
|
|
func validInternalKey(ik []byte) bool {
|
|
_, _, _, err := parseInternalKey(ik)
|
|
return err == nil
|
|
}
|
|
|
|
func (ik internalKey) assert() {
|
|
if ik == nil {
|
|
panic("leveldb: nil internalKey")
|
|
}
|
|
if len(ik) < 8 {
|
|
panic(fmt.Sprintf("leveldb: internal key %q, len=%d: invalid length", []byte(ik), len(ik)))
|
|
}
|
|
}
|
|
|
|
func (ik internalKey) ukey() []byte {
|
|
ik.assert()
|
|
return ik[:len(ik)-8]
|
|
}
|
|
|
|
func (ik internalKey) num() uint64 {
|
|
ik.assert()
|
|
return binary.LittleEndian.Uint64(ik[len(ik)-8:])
|
|
}
|
|
|
|
func (ik internalKey) parseNum() (seq uint64, kt keyType) {
|
|
num := ik.num()
|
|
seq, kt = uint64(num>>8), keyType(num&0xff)
|
|
if kt > keyTypeVal {
|
|
panic(fmt.Sprintf("leveldb: internal key %q, len=%d: invalid type %#x", []byte(ik), len(ik), kt))
|
|
}
|
|
return
|
|
}
|
|
|
|
func (ik internalKey) String() string {
|
|
if ik == nil {
|
|
return "<nil>"
|
|
}
|
|
|
|
if ukey, seq, kt, err := parseInternalKey(ik); err == nil {
|
|
return fmt.Sprintf("%s,%s%d", shorten(string(ukey)), kt, seq)
|
|
}
|
|
return "<invalid>"
|
|
}
|