ledis

package
v0.0.0-...-1b73a3d Latest Latest
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 Go to latest Published: Apr 24, 2020 License: MIT Imports: 25 Imported by: 0

Documentation

Overview

Package ledis is a high performance embedded NoSQL.

Ledis supports various data structure like kv, list, hash and zset like redis.

Other features include replication, data with a limited time-to-live.

Usage

First create a ledis instance before use: 

l := ledis.Open(cfg)

cfg is a Config instance which contains configuration for ledis use, like DataDir (root directory for ledis working to store data).

After you create a ledis instance, you can select a DB to store you data: 

db, _ := l.Select(0)

DB must be selected by a index, ledis supports only 16 databases, so the index range is [0-15].

KV

KV is the most basic ledis type like any other key-value database. 

err := db.Set(key, value)
value, err := db.Get(key)

List

List is simply lists of values, sorted by insertion order. You can push or pop value on the list head (left) or tail (right). 

err := db.LPush(key, value1)
err := db.RPush(key, value2)
value1, err := db.LPop(key)
value2, err := db.RPop(key)

Hash

Hash is a map between fields and values. 

n, err := db.HSet(key, field1, value1)
n, err := db.HSet(key, field2, value2)
value1, err := db.HGet(key, field1)
value2, err := db.HGet(key, field2)

ZSet

ZSet is a sorted collections of values. Every member of zset is associated with score, a int64 value which used to sort, from smallest to greatest score. Members are unique, but score may be same. 

n, err := db.ZAdd(key, ScorePair{score1, member1}, ScorePair{score2, member2})
ay, err := db.ZRangeByScore(key, minScore, maxScore, 0, -1)

Index

Constants

View Source 
const (
	KVName   = "KV"
	ListName = "LIST"
	HashName = "HASH"
	SetName  = "SET"
	ZSetName = "ZSET"
)

For different type name

View Source 
const (
	NoneType   byte = 0
	KVType     byte = 1
	HashType   byte = 2
	HSizeType  byte = 3
	ListType   byte = 4
	LMetaType  byte = 5
	ZSetType   byte = 6
	ZSizeType  byte = 7
	ZScoreType byte = 8
	// BitType     byte = 9
	// BitMetaType byte = 10
	SetType   byte = 11
	SSizeType byte = 12

	/*
		I make a big mistake about TTL time key format and have to use a new one (change 101 to 103).
		You must run the ledis-upgrade-ttl to upgrade db.
	*/
	ObsoleteExpTimeType byte = 101
	ExpMetaType         byte = 102
	ExpTimeType         byte = 103

	MetaType byte = 201
)

for backend store

View Source 
const (
	// max allowed databases
	MaxDatabases int = 10240

	// max key size
	MaxKeySize int = 1024

	// max hash field size
	MaxHashFieldSize int = 1024

	// max zset member size
	MaxZSetMemberSize int = 1024

	// max set member size
	MaxSetMemberSize int = 1024

	// max value size
	MaxValueSize int = 1024 * 1024 * 1024
)

For different const size configuration

View Source 
const (
	BitAND = "and"
	BitOR  = "or"
	BitXOR = "xor"
	BitNot = "not"
)

For bit operation

View Source 
const (
	UnionType byte = 51
	DiffType  byte = 52
	InterType byte = 53
)

For set operation type.

View Source 
const (
	MinScore     int64 = -1<<63 + 1
	MaxScore     int64 = 1<<63 - 1
	InvalidScore int64 = -1 << 63

	AggregateSum byte = 0
	AggregateMin byte = 1
	AggregateMax byte = 2
)

For zset const.

View Source 
const Version = "0.5"

Version is for version

Variables

View Source 
var (
	ErrScoreMiss     = errors.New("zset score miss")
	ErrWriteInROnly  = errors.New("write not support in readonly mode")
	ErrRplInRDWR     = errors.New("replication not support in read write mode")
	ErrRplNotSupport = errors.New("replication not support")
)

For different common errors

View Source 
var (
	ErrLogMissed = errors.New("log is pured in server")
)

For replication error.

View Source 
var TypeName = map[byte]string{
	KVType:     "kv",
	HashType:   "hash",
	HSizeType:  "hsize",
	ListType:   "list",
	LMetaType:  "lmeta",
	ZSetType:   "zset",
	ZSizeType:  "zsize",
	ZScoreType: "zscore",

	SetType:     "set",
	SSizeType:   "ssize",
	ExpTimeType: "exptime",
	ExpMetaType: "expmeta",
}

TypeName is the map of type -> name

Functions

func AsyncNotify 

func AsyncNotify(ch chan struct{})

AsyncNotify notices the channel.

func Int64 

func Int64(v []byte, err error) (int64, error)

Int64 gets 64 integer with the little endian format.

func PutInt64 

func PutInt64(v int64) []byte

PutInt64 puts the 64 integer.

func StrInt32 

func StrInt32(v []byte, err error) (int32, error)

StrInt32 gets the 32 integer with string format.

func StrInt64 

func StrInt64(v []byte, err error) (int64, error)

StrInt64 gets the 64 integer with string format.

func StrInt8 

func StrInt8(v []byte, err error) (int8, error)

StrInt8 ets the 8 integer with string format.

func StrUint64 

func StrUint64(v []byte, err error) (uint64, error)

StrUint64 gets the unsigned 64 integer with string format.

func Uint64 

func Uint64(v []byte, err error) (uint64, error)

Uint64 gets unsigned 64 integer.

Types

type DB 

type DB struct {
	// contains filtered or unexported fields
}

DB is the database.

func (*DB) Append 

func (db *DB) Append(key []byte, value []byte) (int64, error)

Append appends the value to the data.

func (*DB) BLPop 

func (db *DB) BLPop(keys [][]byte, timeout time.Duration) ([]interface{}, error)

BLPop pops the list with block way.

func (*DB) BRPop 

func (db *DB) BRPop(keys [][]byte, timeout time.Duration) ([]interface{}, error)

BRPop bpops the list with block way.

func (*DB) BitCount 

func (db *DB) BitCount(key []byte, start int, end int) (int64, error)

BitCount returns the bit count of data.

func (*DB) BitOP 

func (db *DB) BitOP(op string, destKey []byte, srcKeys ...[]byte) (int64, error)

BitOP does the bit operations in data.

func (*DB) BitPos 

func (db *DB) BitPos(key []byte, on int, start int, end int) (int64, error)

BitPos returns the pos of the data.

func (*DB) Decr 

func (db *DB) Decr(key []byte) (int64, error)

Decr decreases the data.

func (*DB) DecrBy 

func (db *DB) DecrBy(key []byte, decrement int64) (int64, error)

DecrBy decreases the data by decrement.

func (*DB) Del 

func (db *DB) Del(keys ...[]byte) (int64, error)

Del deletes the data.

func (*DB) Dump 

func (db *DB) Dump(key []byte) ([]byte, error)

Dump dumps the KV value of key

func (*DB) Exists 

func (db *DB) Exists(key []byte) (int64, error)

Exists check data exists or not.

func (*DB) Expire 

func (db *DB) Expire(key []byte, duration int64) (int64, error)

Expire expires the data.

func (*DB) ExpireAt 

func (db *DB) ExpireAt(key []byte, when int64) (int64, error)

ExpireAt expires the data at when.

func (*DB) FlushAll 

func (db *DB) FlushAll() (drop int64, err error)

FlushAll flushes the data.

func (*DB) Get 

func (db *DB) Get(key []byte) ([]byte, error)

Get gets the value.

func (*DB) GetBit 

func (db *DB) GetBit(key []byte, offset int) (int64, error)

GetBit gets the bit of data at offset.

func (*DB) GetRange 

func (db *DB) GetRange(key []byte, start int, end int) ([]byte, error)

GetRange gets the range of the data.

func (*DB) GetSet 

func (db *DB) GetSet(key []byte, value []byte) ([]byte, error)

GetSet gets the value and sets new value.

func (*DB) GetSlice 

func (db *DB) GetSlice(key []byte) (store.Slice, error)

GetSlice gets the slice of the data.

func (*DB) HClear 

func (db *DB) HClear(key []byte) (int64, error)

HClear clears the data.

func (*DB) HDel 

func (db *DB) HDel(key []byte, args ...[]byte) (int64, error)

HDel deletes the fields.

func (*DB) HDump 

func (db *DB) HDump(key []byte) ([]byte, error)

HDump dumps the hash value of key

func (*DB) HExpire 

func (db *DB) HExpire(key []byte, duration int64) (int64, error)

HExpire expires the data with duration.

func (*DB) HExpireAt 

func (db *DB) HExpireAt(key []byte, when int64) (int64, error)

HExpireAt expires the data at time when.

func (*DB) HGet 

func (db *DB) HGet(key []byte, field []byte) ([]byte, error)

HGet gets the value of the field.

func (*DB) HGetAll 

func (db *DB) HGetAll(key []byte) ([]FVPair, error)

HGetAll returns all field-values.

func (*DB) HIncrBy 

func (db *DB) HIncrBy(key []byte, field []byte, delta int64) (int64, error)

HIncrBy increases the value of field by delta.

func (*DB) HKeyExists 

func (db *DB) HKeyExists(key []byte) (int64, error)

HKeyExists checks whether data exists or not.

func (*DB) HKeys 

func (db *DB) HKeys(key []byte) ([][]byte, error)

HKeys returns the all fields.

func (*DB) HLen 

func (db *DB) HLen(key []byte) (int64, error)

HLen returns the lengh of hash.

func (*DB) HMclear 

func (db *DB) HMclear(keys ...[]byte) (int64, error)

HMclear cleans multi data.

func (*DB) HMget 

func (db *DB) HMget(key []byte, args ...[]byte) ([][]byte, error)

HMget gets multi values of fields

func (*DB) HMset 

func (db *DB) HMset(key []byte, args ...FVPair) error

HMset sets multi field-values.

func (*DB) HPersist 

func (db *DB) HPersist(key []byte) (int64, error)

HPersist removes the TTL of data.

func (*DB) HRevScan 

func (db *DB) HRevScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([]FVPair, error)

HRevScan reversed scans data for hash.

func (*DB) HScan 

func (db *DB) HScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([]FVPair, error)

HScan scans data for hash.

func (*DB) HSet 

func (db *DB) HSet(key []byte, field []byte, value []byte) (int64, error)

HSet sets the field with value of key.

func (*DB) HTTL 

func (db *DB) HTTL(key []byte) (int64, error)

HTTL gets the TTL of data.

func (*DB) HValues 

func (db *DB) HValues(key []byte) ([][]byte, error)

HValues returns all values

func (*DB) Incr 

func (db *DB) Incr(key []byte) (int64, error)

Incr increases the data.

func (*DB) IncrBy 

func (db *DB) IncrBy(key []byte, increment int64) (int64, error)

IncrBy increases the data by increment.

func (*DB) Index 

func (db *DB) Index() int

Index gets the index of database.

func (*DB) LClear 

func (db *DB) LClear(key []byte) (int64, error)

LClear clears the list.

func (*DB) LDump 

func (db *DB) LDump(key []byte) ([]byte, error)

LDump dumps the list value of key

func (*DB) LExpire 

func (db *DB) LExpire(key []byte, duration int64) (int64, error)

LExpire expires the list.

func (*DB) LExpireAt 

func (db *DB) LExpireAt(key []byte, when int64) (int64, error)

LExpireAt expires the list at when.

func (*DB) LIndex 

func (db *DB) LIndex(key []byte, index int32) ([]byte, error)

LIndex returns the value at index.

func (*DB) LKeyExists 

func (db *DB) LKeyExists(key []byte) (int64, error)

LKeyExists check list existed or not.

func (*DB) LLen 

func (db *DB) LLen(key []byte) (int64, error)

LLen gets the length of the list.

func (*DB) LMclear 

func (db *DB) LMclear(keys ...[]byte) (int64, error)

LMclear clears multi lists.

func (*DB) LPersist 

func (db *DB) LPersist(key []byte) (int64, error)

LPersist removes the TTL of list.

func (*DB) LPop 

func (db *DB) LPop(key []byte) ([]byte, error)

LPop pops the value.

func (*DB) LPush 

func (db *DB) LPush(key []byte, args ...[]byte) (int64, error)

LPush push the value to the list.

func (*DB) LRange 

func (db *DB) LRange(key []byte, start int32, stop int32) ([][]byte, error)

LRange gets the value of list at range.

func (*DB) LSet 

func (db *DB) LSet(key []byte, index int32, value []byte) error

LSet sets the value at index.

func (*DB) LTTL 

func (db *DB) LTTL(key []byte) (int64, error)

LTTL gets the TTL of list.

func (*DB) LTrim 

func (db *DB) LTrim(key []byte, start, stop int64) error

LTrim trims the value from start to stop.

func (*DB) LTrimBack 

func (db *DB) LTrimBack(key []byte, trimSize int32) (int32, error)

LTrimBack trims the value from back.

func (*DB) LTrimFront 

func (db *DB) LTrimFront(key []byte, trimSize int32) (int32, error)

LTrimFront trims the value from top.

func (*DB) MGet 

func (db *DB) MGet(keys ...[]byte) ([][]byte, error)

MGet gets multi data.

func (*DB) MSet 

func (db *DB) MSet(args ...KVPair) error

MSet sets multi data.

func (*DB) Persist 

func (db *DB) Persist(key []byte) (int64, error)

Persist removes the TTL of the data.

func (*DB) RPop 

func (db *DB) RPop(key []byte) ([]byte, error)

RPop rpops the value.

func (*DB) RPush 

func (db *DB) RPush(key []byte, args ...[]byte) (int64, error)

RPush rpushs the value .

func (*DB) Restore 

func (db *DB) Restore(key []byte, ttl int64, data []byte) error

Restore restores a key into database.

func (*DB) RevScan 

func (db *DB) RevScan(dataType DataType, cursor []byte, count int, inclusive bool, match string) ([][]byte, error)

RevScan scans the data reversed. if inclusive is true, revscan range (-inf, cursor] else (inf, cursor)

func (*DB) SAdd 

func (db *DB) SAdd(key []byte, args ...[]byte) (int64, error)

SAdd adds the value to the set.

func (*DB) SCard 

func (db *DB) SCard(key []byte) (int64, error)

SCard gets the size of set.

func (*DB) SClear 

func (db *DB) SClear(key []byte) (int64, error)

SClear clears the set.

func (*DB) SDiff 

func (db *DB) SDiff(keys ...[]byte) ([][]byte, error)

SDiff gets the different of sets.

func (*DB) SDiffStore 

func (db *DB) SDiffStore(dstKey []byte, keys ...[]byte) (int64, error)

SDiffStore gets the different of sets and stores to dest set.

func (*DB) SDump 

func (db *DB) SDump(key []byte) ([]byte, error)

SDump dumps the set value of key

func (*DB) SExpire 

func (db *DB) SExpire(key []byte, duration int64) (int64, error)

SExpire expries the set.

func (*DB) SExpireAt 

func (db *DB) SExpireAt(key []byte, when int64) (int64, error)

SExpireAt expires the set at when.

func (*DB) SInter 

func (db *DB) SInter(keys ...[]byte) ([][]byte, error)

SInter intersects the sets.

func (*DB) SInterStore 

func (db *DB) SInterStore(dstKey []byte, keys ...[]byte) (int64, error)

SInterStore intersects the sets and stores to dest set.

func (*DB) SIsMember 

func (db *DB) SIsMember(key []byte, member []byte) (int64, error)

SIsMember checks member in set.

func (*DB) SKeyExists 

func (db *DB) SKeyExists(key []byte) (int64, error)

SKeyExists checks whether set existed or not.

func (*DB) SMclear 

func (db *DB) SMclear(keys ...[]byte) (int64, error)

SMclear clears multi sets.

func (*DB) SMembers 

func (db *DB) SMembers(key []byte) ([][]byte, error)

SMembers gets members of set.

func (*DB) SPersist 

func (db *DB) SPersist(key []byte) (int64, error)

SPersist removes the TTL of set.

func (*DB) SRem 

func (db *DB) SRem(key []byte, args ...[]byte) (int64, error)

SRem removes the members of set.

func (*DB) SRevScan 

func (db *DB) SRevScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([][]byte, error)

SRevScan scans data reversed for set.

func (*DB) SScan 

func (db *DB) SScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([][]byte, error)

SScan scans data for set.

func (*DB) STTL 

func (db *DB) STTL(key []byte) (int64, error)

STTL gets the TTL of set.

func (*DB) SUnion 

func (db *DB) SUnion(keys ...[]byte) ([][]byte, error)

SUnion unions the sets.

func (*DB) SUnionStore 

func (db *DB) SUnionStore(dstKey []byte, keys ...[]byte) (int64, error)

SUnionStore unions the sets and stores to the dest set.

func (*DB) Scan 

func (db *DB) Scan(dataType DataType, cursor []byte, count int, inclusive bool, match string) ([][]byte, error)

Scan scans the data. If inclusive is true, scan range [cursor, inf) else (cursor, inf)

func (*DB) Set 

func (db *DB) Set(key []byte, value []byte) error

Set sets the data.

func (*DB) SetBit 

func (db *DB) SetBit(key []byte, offset int, on int) (int64, error)

SetBit sets the bit to the data.

func (*DB) SetEX 

func (db *DB) SetEX(key []byte, duration int64, value []byte) error

SetEX sets the data with a TTL.

func (*DB) SetNX 

func (db *DB) SetNX(key []byte, value []byte) (int64, error)

SetNX sets the data if not existed.

func (*DB) SetRange 

func (db *DB) SetRange(key []byte, offset int, value []byte) (int64, error)

SetRange sets the data with new value from offset.

func (*DB) StrLen 

func (db *DB) StrLen(key []byte) (int64, error)

StrLen returns the length of the data.

func (*DB) TTL 

func (db *DB) TTL(key []byte) (int64, error)

TTL returns the TTL of the data.

func (*DB) XLSort 

func (db *DB) XLSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error)

XLSort sorts list.

func (*DB) XSSort 

func (db *DB) XSSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error)

XSSort sorts set.

func (*DB) XZSort 

func (db *DB) XZSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error)

XZSort sorts zset.

func (*DB) ZAdd 

func (db *DB) ZAdd(key []byte, args ...ScorePair) (int64, error)

ZAdd add the members.

func (*DB) ZCard 

func (db *DB) ZCard(key []byte) (int64, error)

ZCard gets the size of the zset.

func (*DB) ZClear 

func (db *DB) ZClear(key []byte) (int64, error)

ZClear clears the zset.

func (*DB) ZCount 

func (db *DB) ZCount(key []byte, min int64, max int64) (int64, error)

ZCount gets the number of score in [min, max]

func (*DB) ZDump 

func (db *DB) ZDump(key []byte) ([]byte, error)

ZDump dumps the zset value of key

func (*DB) ZExpire 

func (db *DB) ZExpire(key []byte, duration int64) (int64, error)

ZExpire expires the zset.

func (*DB) ZExpireAt 

func (db *DB) ZExpireAt(key []byte, when int64) (int64, error)

ZExpireAt expires the zset at when.

func (*DB) ZIncrBy 

func (db *DB) ZIncrBy(key []byte, delta int64, member []byte) (int64, error)

ZIncrBy increases the score of member with delta.

func (*DB) ZInterStore 

func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, aggregate byte) (int64, error)

ZInterStore intersects the zsets and stores to dest zset.

func (*DB) ZKeyExists 

func (db *DB) ZKeyExists(key []byte) (int64, error)

ZKeyExists checks zset existed or not.

func (*DB) ZLexCount 

func (db *DB) ZLexCount(key []byte, min []byte, max []byte, rangeType uint8) (int64, error)

ZLexCount gets the count of zset lexicographically.

func (*DB) ZMclear 

func (db *DB) ZMclear(keys ...[]byte) (int64, error)

ZMclear clears multi zsets.

func (*DB) ZPersist 

func (db *DB) ZPersist(key []byte) (int64, error)

ZPersist removes the TTL of zset.

func (*DB) ZRange 

func (db *DB) ZRange(key []byte, start int, stop int) ([]ScorePair, error)

ZRange gets the members from start to stop.

func (*DB) ZRangeByLex 

func (db *DB) ZRangeByLex(key []byte, min []byte, max []byte, rangeType uint8, offset int, count int) ([][]byte, error)

ZRangeByLex scans the zset lexicographically

func (*DB) ZRangeByScore 

func (db *DB) ZRangeByScore(key []byte, min int64, max int64,
	offset int, count int) ([]ScorePair, error)

ZRangeByScore gets the data with score in min and max. min and max must be inclusive if no limit, set offset = 0 and count = -1

func (*DB) ZRangeByScoreGeneric 

func (db *DB) ZRangeByScoreGeneric(key []byte, min int64, max int64,
	offset int, count int, reverse bool) ([]ScorePair, error)

ZRangeByScoreGeneric is a generic function to scan zset with score. min and max must be inclusive if no limit, set offset = 0 and count = -1

func (*DB) ZRangeGeneric 

func (db *DB) ZRangeGeneric(key []byte, start int, stop int, reverse bool) ([]ScorePair, error)

ZRangeGeneric is a generic function for scan zset.

func (*DB) ZRank 

func (db *DB) ZRank(key []byte, member []byte) (int64, error)

ZRank gets the rank of member.

func (*DB) ZRem 

func (db *DB) ZRem(key []byte, members ...[]byte) (int64, error)

ZRem removes members

func (*DB) ZRemRangeByLex 

func (db *DB) ZRemRangeByLex(key []byte, min []byte, max []byte, rangeType uint8) (int64, error)

ZRemRangeByLex remvoes members in [min, max] lexicographically

func (*DB) ZRemRangeByRank 

func (db *DB) ZRemRangeByRank(key []byte, start int, stop int) (int64, error)

ZRemRangeByRank removes the member at range from start to stop.

func (*DB) ZRemRangeByScore 

func (db *DB) ZRemRangeByScore(key []byte, min int64, max int64) (int64, error)

ZRemRangeByScore removes the data with score at [min, max]

func (*DB) ZRevRange 

func (db *DB) ZRevRange(key []byte, start int, stop int) ([]ScorePair, error)

ZRevRange gets the data reversed.

func (*DB) ZRevRangeByScore 

func (db *DB) ZRevRangeByScore(key []byte, min int64, max int64, offset int, count int) ([]ScorePair, error)

ZRevRangeByScore gets the data with score at [min, max] min and max must be inclusive if no limit, set offset = 0 and count = -1

func (*DB) ZRevRank 

func (db *DB) ZRevRank(key []byte, member []byte) (int64, error)

ZRevRank gets the rank of member reversed.

func (*DB) ZRevScan 

func (db *DB) ZRevScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([]ScorePair, error)

ZRevScan scans data reversed for zset.

func (*DB) ZScan 

func (db *DB) ZScan(key []byte, cursor []byte, count int, inclusive bool, match string) ([]ScorePair, error)

ZScan scans data for zset.

func (*DB) ZScore 

func (db *DB) ZScore(key []byte, member []byte) (int64, error)

ZScore gets the score of member.

func (*DB) ZTTL 

func (db *DB) ZTTL(key []byte) (int64, error)

ZTTL gets the TTL of zset.

func (*DB) ZUnionStore 

func (db *DB) ZUnionStore(destKey []byte, srcKeys [][]byte, weights []int64, aggregate byte) (int64, error)

ZUnionStore unions the zsets and stores to dest zset.

type DataType 

type DataType byte

DataType is defined for the different types 

const (
	KV DataType = iota
	LIST
	HASH
	SET
	ZSET
)

for out use

func (DataType) String 

func (d DataType) String() string

type DumpHead 

type DumpHead struct {
	CommitID uint64
}

DumpHead is the head of a dump.

func (*DumpHead) Read 

func (h *DumpHead) Read(r io.Reader) error

Read reads meta from the Reader.

func (*DumpHead) Write 

func (h *DumpHead) Write(w io.Writer) error

Write writes meta to the Writer

type FVPair 

type FVPair struct {
	Field []byte
	Value []byte
}

FVPair is the pair of field and value.

type KVPair 

type KVPair struct {
	Key   []byte
	Value []byte
}

KVPair is the pair of key-value.

type Ledis 

type Ledis struct {
	// contains filtered or unexported fields
}

Ledis is the core structure to handle the database.

func Open 

func Open(cfg *config.Config) (*Ledis, error)

Open opens the Ledis with a config.

func (*Ledis) AddNewLogEventHandler 

func (l *Ledis) AddNewLogEventHandler(h NewLogEventHandler) error

AddNewLogEventHandler adds the handler for the new log event

func (*Ledis) Close 

func (l *Ledis) Close()

Close closes the Ledis.

func (*Ledis) CompactStore 

func (l *Ledis) CompactStore() error

CompactStore compacts the backend storage.

func (*Ledis) Dump 

func (l *Ledis) Dump(w io.Writer) error

Dump dumps data to the Writer.

func (*Ledis) DumpFile 

func (l *Ledis) DumpFile(path string) error

DumpFile dumps data to the file

func (*Ledis) FlushAll 

func (l *Ledis) FlushAll() error

FlushAll will clear all data and replication logs

func (*Ledis) IsReadOnly 

func (l *Ledis) IsReadOnly() bool

IsReadOnly returns whether Ledis is read only or not.

func (*Ledis) LoadDump 

func (l *Ledis) LoadDump(r io.Reader) (*DumpHead, error)

LoadDump clears all data and loads dump file to db

func (*Ledis) LoadDumpFile 

func (l *Ledis) LoadDumpFile(path string) (*DumpHead, error)

LoadDumpFile clears all data and loads dump file to db

func (*Ledis) ReadLogsTo 

func (l *Ledis) ReadLogsTo(startLogID uint64, w io.Writer) (n int, nextLogID uint64, err error)

ReadLogsTo reads logs and write to the Writer.

func (*Ledis) ReadLogsToTimeout 

func (l *Ledis) ReadLogsToTimeout(startLogID uint64, w io.Writer, timeout int, quitCh chan struct{}) (n int, nextLogID uint64, err error)

ReadLogsToTimeout tries to read events, if no events read, tres to wait the new event singal until timeout seconds

func (*Ledis) ReplicationStat 

func (l *Ledis) ReplicationStat() (*rpl.Stat, error)

ReplicationStat returns the statistics of repliaciton.

func (*Ledis) ReplicationUsed 

func (l *Ledis) ReplicationUsed() bool

ReplicationUsed returns whether replication is used or not.

func (*Ledis) Select 

func (l *Ledis) Select(index int) (*DB, error)

Select chooses a database.

func (*Ledis) StoreLogsFromData 

func (l *Ledis) StoreLogsFromData(data []byte) error

StoreLogsFromData stores logs from data.

func (*Ledis) StoreLogsFromReader 

func (l *Ledis) StoreLogsFromReader(rb io.Reader) error

StoreLogsFromReader stores logs from the Reader

func (*Ledis) StoreStat 

func (l *Ledis) StoreStat() *store.Stat

StoreStat returns the statistics.

func (*Ledis) WaitReplication 

func (l *Ledis) WaitReplication() error

WaitReplication waits replication done

type Limit 

type Limit struct {
	Offset int
	Size   int
}

Limit is for sort.

type NewLogEventHandler 

type NewLogEventHandler func(rl *rpl.Log)

NewLogEventHandler is the handler to handle new log event.

type ScorePair 

type ScorePair struct {
	Score  int64
	Member []byte
}

ScorePair is the pair of score and member.

Source Files

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