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gitea/vendor/github.com/lunny/nodb/t_hash.go

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2019-02-05 16:52:51 +00:00
package nodb
import (
"encoding/binary"
"errors"
"time"
"github.com/lunny/nodb/store"
)
type FVPair struct {
Field []byte
Value []byte
}
var errHashKey = errors.New("invalid hash key")
var errHSizeKey = errors.New("invalid hsize key")
const (
hashStartSep byte = ':'
hashStopSep byte = hashStartSep + 1
)
func checkHashKFSize(key []byte, field []byte) error {
if len(key) > MaxKeySize || len(key) == 0 {
return errKeySize
} else if len(field) > MaxHashFieldSize || len(field) == 0 {
return errHashFieldSize
}
return nil
}
func (db *DB) hEncodeSizeKey(key []byte) []byte {
buf := make([]byte, len(key)+2)
buf[0] = db.index
buf[1] = HSizeType
copy(buf[2:], key)
return buf
}
func (db *DB) hDecodeSizeKey(ek []byte) ([]byte, error) {
if len(ek) < 2 || ek[0] != db.index || ek[1] != HSizeType {
return nil, errHSizeKey
}
return ek[2:], nil
}
func (db *DB) hEncodeHashKey(key []byte, field []byte) []byte {
buf := make([]byte, len(key)+len(field)+1+1+2+1)
pos := 0
buf[pos] = db.index
pos++
buf[pos] = HashType
pos++
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
pos += 2
copy(buf[pos:], key)
pos += len(key)
buf[pos] = hashStartSep
pos++
copy(buf[pos:], field)
return buf
}
func (db *DB) hDecodeHashKey(ek []byte) ([]byte, []byte, error) {
if len(ek) < 5 || ek[0] != db.index || ek[1] != HashType {
return nil, nil, errHashKey
}
pos := 2
keyLen := int(binary.BigEndian.Uint16(ek[pos:]))
pos += 2
if keyLen+5 > len(ek) {
return nil, nil, errHashKey
}
key := ek[pos : pos+keyLen]
pos += keyLen
if ek[pos] != hashStartSep {
return nil, nil, errHashKey
}
pos++
field := ek[pos:]
return key, field, nil
}
func (db *DB) hEncodeStartKey(key []byte) []byte {
return db.hEncodeHashKey(key, nil)
}
func (db *DB) hEncodeStopKey(key []byte) []byte {
k := db.hEncodeHashKey(key, nil)
k[len(k)-1] = hashStopSep
return k
}
func (db *DB) hSetItem(key []byte, field []byte, value []byte) (int64, error) {
t := db.hashBatch
ek := db.hEncodeHashKey(key, field)
var n int64 = 1
if v, _ := db.bucket.Get(ek); v != nil {
n = 0
} else {
if _, err := db.hIncrSize(key, 1); err != nil {
return 0, err
}
}
t.Put(ek, value)
return n, nil
}
// ps : here just focus on deleting the hash data,
// any other likes expire is ignore.
func (db *DB) hDelete(t *batch, key []byte) int64 {
sk := db.hEncodeSizeKey(key)
start := db.hEncodeStartKey(key)
stop := db.hEncodeStopKey(key)
var num int64 = 0
it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
for ; it.Valid(); it.Next() {
t.Delete(it.Key())
num++
}
it.Close()
t.Delete(sk)
return num
}
func (db *DB) hExpireAt(key []byte, when int64) (int64, error) {
t := db.hashBatch
t.Lock()
defer t.Unlock()
if hlen, err := db.HLen(key); err != nil || hlen == 0 {
return 0, err
} else {
db.expireAt(t, HashType, key, when)
if err := t.Commit(); err != nil {
return 0, err
}
}
return 1, nil
}
func (db *DB) HLen(key []byte) (int64, error) {
if err := checkKeySize(key); err != nil {
return 0, err
}
return Int64(db.bucket.Get(db.hEncodeSizeKey(key)))
}
func (db *DB) HSet(key []byte, field []byte, value []byte) (int64, error) {
if err := checkHashKFSize(key, field); err != nil {
return 0, err
} else if err := checkValueSize(value); err != nil {
return 0, err
}
t := db.hashBatch
t.Lock()
defer t.Unlock()
n, err := db.hSetItem(key, field, value)
if err != nil {
return 0, err
}
//todo add binlog
err = t.Commit()
return n, err
}
func (db *DB) HGet(key []byte, field []byte) ([]byte, error) {
if err := checkHashKFSize(key, field); err != nil {
return nil, err
}
return db.bucket.Get(db.hEncodeHashKey(key, field))
}
func (db *DB) HMset(key []byte, args ...FVPair) error {
t := db.hashBatch
t.Lock()
defer t.Unlock()
var err error
var ek []byte
var num int64 = 0
for i := 0; i < len(args); i++ {
if err := checkHashKFSize(key, args[i].Field); err != nil {
return err
} else if err := checkValueSize(args[i].Value); err != nil {
return err
}
ek = db.hEncodeHashKey(key, args[i].Field)
if v, err := db.bucket.Get(ek); err != nil {
return err
} else if v == nil {
num++
}
t.Put(ek, args[i].Value)
}
if _, err = db.hIncrSize(key, num); err != nil {
return err
}
//todo add binglog
err = t.Commit()
return err
}
func (db *DB) HMget(key []byte, args ...[]byte) ([][]byte, error) {
var ek []byte
it := db.bucket.NewIterator()
defer it.Close()
r := make([][]byte, len(args))
for i := 0; i < len(args); i++ {
if err := checkHashKFSize(key, args[i]); err != nil {
return nil, err
}
ek = db.hEncodeHashKey(key, args[i])
r[i] = it.Find(ek)
}
return r, nil
}
func (db *DB) HDel(key []byte, args ...[]byte) (int64, error) {
t := db.hashBatch
var ek []byte
var v []byte
var err error
t.Lock()
defer t.Unlock()
it := db.bucket.NewIterator()
defer it.Close()
var num int64 = 0
for i := 0; i < len(args); i++ {
if err := checkHashKFSize(key, args[i]); err != nil {
return 0, err
}
ek = db.hEncodeHashKey(key, args[i])
v = it.RawFind(ek)
if v == nil {
continue
} else {
num++
t.Delete(ek)
}
}
if _, err = db.hIncrSize(key, -num); err != nil {
return 0, err
}
err = t.Commit()
return num, err
}
func (db *DB) hIncrSize(key []byte, delta int64) (int64, error) {
t := db.hashBatch
sk := db.hEncodeSizeKey(key)
var err error
var size int64 = 0
if size, err = Int64(db.bucket.Get(sk)); err != nil {
return 0, err
} else {
size += delta
if size <= 0 {
size = 0
t.Delete(sk)
db.rmExpire(t, HashType, key)
} else {
t.Put(sk, PutInt64(size))
}
}
return size, nil
}
func (db *DB) HIncrBy(key []byte, field []byte, delta int64) (int64, error) {
if err := checkHashKFSize(key, field); err != nil {
return 0, err
}
t := db.hashBatch
var ek []byte
var err error
t.Lock()
defer t.Unlock()
ek = db.hEncodeHashKey(key, field)
var n int64 = 0
if n, err = StrInt64(db.bucket.Get(ek)); err != nil {
return 0, err
}
n += delta
_, err = db.hSetItem(key, field, StrPutInt64(n))
if err != nil {
return 0, err
}
err = t.Commit()
return n, err
}
func (db *DB) HGetAll(key []byte) ([]FVPair, error) {
if err := checkKeySize(key); err != nil {
return nil, err
}
start := db.hEncodeStartKey(key)
stop := db.hEncodeStopKey(key)
v := make([]FVPair, 0, 16)
it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
for ; it.Valid(); it.Next() {
_, f, err := db.hDecodeHashKey(it.Key())
if err != nil {
return nil, err
}
v = append(v, FVPair{Field: f, Value: it.Value()})
}
it.Close()
return v, nil
}
func (db *DB) HKeys(key []byte) ([][]byte, error) {
if err := checkKeySize(key); err != nil {
return nil, err
}
start := db.hEncodeStartKey(key)
stop := db.hEncodeStopKey(key)
v := make([][]byte, 0, 16)
it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
for ; it.Valid(); it.Next() {
_, f, err := db.hDecodeHashKey(it.Key())
if err != nil {
return nil, err
}
v = append(v, f)
}
it.Close()
return v, nil
}
func (db *DB) HValues(key []byte) ([][]byte, error) {
if err := checkKeySize(key); err != nil {
return nil, err
}
start := db.hEncodeStartKey(key)
stop := db.hEncodeStopKey(key)
v := make([][]byte, 0, 16)
it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
for ; it.Valid(); it.Next() {
_, _, err := db.hDecodeHashKey(it.Key())
if err != nil {
return nil, err
}
v = append(v, it.Value())
}
it.Close()
return v, nil
}
func (db *DB) HClear(key []byte) (int64, error) {
if err := checkKeySize(key); err != nil {
return 0, err
}
t := db.hashBatch
t.Lock()
defer t.Unlock()
num := db.hDelete(t, key)
db.rmExpire(t, HashType, key)
err := t.Commit()
return num, err
}
func (db *DB) HMclear(keys ...[]byte) (int64, error) {
t := db.hashBatch
t.Lock()
defer t.Unlock()
for _, key := range keys {
if err := checkKeySize(key); err != nil {
return 0, err
}
db.hDelete(t, key)
db.rmExpire(t, HashType, key)
}
err := t.Commit()
return int64(len(keys)), err
}
func (db *DB) hFlush() (drop int64, err error) {
t := db.hashBatch
t.Lock()
defer t.Unlock()
return db.flushType(t, HashType)
}
func (db *DB) HScan(key []byte, count int, inclusive bool, match string) ([][]byte, error) {
return db.scan(HSizeType, key, count, inclusive, match)
}
func (db *DB) HExpire(key []byte, duration int64) (int64, error) {
if duration <= 0 {
return 0, errExpireValue
}
return db.hExpireAt(key, time.Now().Unix()+duration)
}
func (db *DB) HExpireAt(key []byte, when int64) (int64, error) {
if when <= time.Now().Unix() {
return 0, errExpireValue
}
return db.hExpireAt(key, when)
}
func (db *DB) HTTL(key []byte) (int64, error) {
if err := checkKeySize(key); err != nil {
return -1, err
}
return db.ttl(HashType, key)
}
func (db *DB) HPersist(key []byte) (int64, error) {
if err := checkKeySize(key); err != nil {
return 0, err
}
t := db.hashBatch
t.Lock()
defer t.Unlock()
n, err := db.rmExpire(t, HashType, key)
if err != nil {
return 0, err
}
err = t.Commit()
return n, err
}