mirror of
https://github.com/HDT3213/godis.git
synced 2025-10-04 16:32:41 +08:00
389 lines
10 KiB
Go
389 lines
10 KiB
Go
package database
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import (
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"github.com/hdt3213/godis/aof"
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"github.com/hdt3213/godis/datastruct/dict"
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"github.com/hdt3213/godis/datastruct/list"
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"github.com/hdt3213/godis/datastruct/set"
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"github.com/hdt3213/godis/datastruct/sortedset"
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"github.com/hdt3213/godis/interface/redis"
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"github.com/hdt3213/godis/lib/utils"
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"github.com/hdt3213/godis/lib/wildcard"
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"github.com/hdt3213/godis/redis/protocol"
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"strconv"
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"strings"
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"time"
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)
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// execDel removes a key from db
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func execDel(db *DB, args [][]byte) redis.Reply {
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keys := make([]string, len(args))
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for i, v := range args {
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keys[i] = string(v)
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}
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deleted := db.Removes(keys...)
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if deleted > 0 {
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db.addAof(utils.ToCmdLine3("del", args...))
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}
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return protocol.MakeIntReply(int64(deleted))
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}
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func undoDel(db *DB, args [][]byte) []CmdLine {
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keys := make([]string, len(args))
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for i, v := range args {
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keys[i] = string(v)
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}
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return rollbackGivenKeys(db, keys...)
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}
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// execExists checks if given key is existed in db
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func execExists(db *DB, args [][]byte) redis.Reply {
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result := int64(0)
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for _, arg := range args {
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key := string(arg)
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_, exists := db.GetEntity(key)
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if exists {
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result++
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}
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}
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return protocol.MakeIntReply(result)
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}
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// execFlushDB removes all data in current db
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func execFlushDB(db *DB, args [][]byte) redis.Reply {
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db.Flush()
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db.addAof(utils.ToCmdLine3("flushdb", args...))
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return &protocol.OkReply{}
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}
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// execType returns the type of entity, including: string, list, hash, set and zset
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func execType(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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entity, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeStatusReply("none")
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}
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switch entity.Data.(type) {
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case []byte:
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return protocol.MakeStatusReply("string")
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case *list.LinkedList:
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return protocol.MakeStatusReply("list")
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case dict.Dict:
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return protocol.MakeStatusReply("hash")
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case *set.Set:
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return protocol.MakeStatusReply("set")
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case *sortedset.SortedSet:
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return protocol.MakeStatusReply("zset")
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}
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return &protocol.UnknownErrReply{}
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}
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func prepareRename(args [][]byte) ([]string, []string) {
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src := string(args[0])
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dest := string(args[1])
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return []string{dest}, []string{src}
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}
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// execRename a key
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func execRename(db *DB, args [][]byte) redis.Reply {
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if len(args) != 2 {
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return protocol.MakeErrReply("ERR wrong number of arguments for 'rename' command")
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}
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src := string(args[0])
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dest := string(args[1])
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entity, ok := db.GetEntity(src)
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if !ok {
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return protocol.MakeErrReply("no such key")
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}
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rawTTL, hasTTL := db.ttlMap.Get(src)
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db.PutEntity(dest, entity)
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db.Remove(src)
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if hasTTL {
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db.Persist(src) // clean src and dest with their ttl
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db.Persist(dest)
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expireTime, _ := rawTTL.(time.Time)
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db.Expire(dest, expireTime)
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}
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db.addAof(utils.ToCmdLine3("rename", args...))
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return &protocol.OkReply{}
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}
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func undoRename(db *DB, args [][]byte) []CmdLine {
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src := string(args[0])
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dest := string(args[1])
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return rollbackGivenKeys(db, src, dest)
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}
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// execRenameNx a key, only if the new key does not exist
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func execRenameNx(db *DB, args [][]byte) redis.Reply {
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src := string(args[0])
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dest := string(args[1])
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_, ok := db.GetEntity(dest)
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if ok {
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return protocol.MakeIntReply(0)
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}
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entity, ok := db.GetEntity(src)
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if !ok {
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return protocol.MakeErrReply("no such key")
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}
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rawTTL, hasTTL := db.ttlMap.Get(src)
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db.Removes(src, dest) // clean src and dest with their ttl
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db.PutEntity(dest, entity)
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if hasTTL {
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db.Persist(src) // clean src and dest with their ttl
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db.Persist(dest)
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expireTime, _ := rawTTL.(time.Time)
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db.Expire(dest, expireTime)
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}
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db.addAof(utils.ToCmdLine3("renamenx", args...))
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return protocol.MakeIntReply(1)
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}
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// execExpire sets a key's time to live in seconds
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func execExpire(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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ttlArg, err := strconv.ParseInt(string(args[1]), 10, 64)
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if err != nil {
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return protocol.MakeErrReply("ERR value is not an integer or out of range")
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}
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ttl := time.Duration(ttlArg) * time.Second
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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expireAt := time.Now().Add(ttl)
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db.Expire(key, expireAt)
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db.addAof(aof.MakeExpireCmd(key, expireAt).Args)
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return protocol.MakeIntReply(1)
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}
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// execExpireAt sets a key's expiration in unix timestamp
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func execExpireAt(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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raw, err := strconv.ParseInt(string(args[1]), 10, 64)
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if err != nil {
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return protocol.MakeErrReply("ERR value is not an integer or out of range")
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}
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expireAt := time.Unix(raw, 0)
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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db.Expire(key, expireAt)
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db.addAof(aof.MakeExpireCmd(key, expireAt).Args)
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return protocol.MakeIntReply(1)
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}
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// execPExpire sets a key's time to live in milliseconds
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func execPExpire(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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ttlArg, err := strconv.ParseInt(string(args[1]), 10, 64)
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if err != nil {
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return protocol.MakeErrReply("ERR value is not an integer or out of range")
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}
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ttl := time.Duration(ttlArg) * time.Millisecond
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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expireAt := time.Now().Add(ttl)
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db.Expire(key, expireAt)
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db.addAof(aof.MakeExpireCmd(key, expireAt).Args)
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return protocol.MakeIntReply(1)
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}
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// execPExpireAt sets a key's expiration in unix timestamp specified in milliseconds
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func execPExpireAt(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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raw, err := strconv.ParseInt(string(args[1]), 10, 64)
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if err != nil {
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return protocol.MakeErrReply("ERR value is not an integer or out of range")
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}
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expireAt := time.Unix(0, raw*int64(time.Millisecond))
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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db.Expire(key, expireAt)
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db.addAof(aof.MakeExpireCmd(key, expireAt).Args)
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return protocol.MakeIntReply(1)
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}
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// execTTL returns a key's time to live in seconds
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func execTTL(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(-2)
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}
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raw, exists := db.ttlMap.Get(key)
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if !exists {
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return protocol.MakeIntReply(-1)
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}
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expireTime, _ := raw.(time.Time)
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ttl := expireTime.Sub(time.Now())
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return protocol.MakeIntReply(int64(ttl / time.Second))
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}
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// execPTTL returns a key's time to live in milliseconds
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func execPTTL(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(-2)
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}
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raw, exists := db.ttlMap.Get(key)
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if !exists {
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return protocol.MakeIntReply(-1)
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}
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expireTime, _ := raw.(time.Time)
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ttl := expireTime.Sub(time.Now())
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return protocol.MakeIntReply(int64(ttl / time.Millisecond))
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}
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// execPersist removes expiration from a key
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func execPersist(db *DB, args [][]byte) redis.Reply {
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key := string(args[0])
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_, exists := db.GetEntity(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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_, exists = db.ttlMap.Get(key)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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db.Persist(key)
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db.addAof(utils.ToCmdLine3("persist", args...))
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return protocol.MakeIntReply(1)
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}
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// execKeys returns all keys matching the given pattern
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func execKeys(db *DB, args [][]byte) redis.Reply {
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pattern := wildcard.CompilePattern(string(args[0]))
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result := make([][]byte, 0)
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db.data.ForEach(func(key string, val interface{}) bool {
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if pattern.IsMatch(key) {
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result = append(result, []byte(key))
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}
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return true
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})
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return protocol.MakeMultiBulkReply(result)
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}
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func toTTLCmd(db *DB, key string) *protocol.MultiBulkReply {
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raw, exists := db.ttlMap.Get(key)
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if !exists {
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// has no TTL
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return protocol.MakeMultiBulkReply(utils.ToCmdLine("PERSIST", key))
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}
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expireTime, _ := raw.(time.Time)
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timestamp := strconv.FormatInt(expireTime.UnixNano()/1000/1000, 10)
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return protocol.MakeMultiBulkReply(utils.ToCmdLine("PEXPIREAT", key, timestamp))
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}
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func undoExpire(db *DB, args [][]byte) []CmdLine {
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key := string(args[0])
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return []CmdLine{
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toTTLCmd(db, key).Args,
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}
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}
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// execCopy usage: COPY source destination [DB destination-db] [REPLACE]
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// This command copies the value stored at the source key to the destination key.
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func execCopy(mdb *MultiDB, conn redis.Connection, args [][]byte) redis.Reply {
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dbIndex := conn.GetDBIndex()
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db := mdb.dbSet[dbIndex] // Current DB
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replaceFlag := false
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srcKey := string(args[0])
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destKey := string(args[1])
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// Parse options
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if len(args) > 2 {
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for i := 2; i < len(args); i++ {
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arg := strings.ToLower(string(args[i]))
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if arg == "db" {
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if i+1 >= len(args) {
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return &protocol.SyntaxErrReply{}
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}
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idx, err := strconv.Atoi(string(args[i+1]))
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if err != nil {
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return &protocol.SyntaxErrReply{}
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}
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if idx >= len(mdb.dbSet) || idx < 0 {
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return protocol.MakeErrReply("ERR DB index is out of range")
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}
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dbIndex = idx
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i++
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} else if arg == "replace" {
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replaceFlag = true
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} else {
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return &protocol.SyntaxErrReply{}
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}
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}
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}
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if srcKey == destKey && dbIndex == conn.GetDBIndex() {
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return protocol.MakeErrReply("ERR source and destination objects are the same")
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}
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// source key does not exist
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src, exists := db.GetEntity(srcKey)
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if !exists {
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return protocol.MakeIntReply(0)
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}
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destDB := mdb.dbSet[dbIndex]
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if _, exists = destDB.GetEntity(destKey); exists != false {
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// If destKey exists and there is no "replace" option
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if replaceFlag == false {
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return protocol.MakeIntReply(0)
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}
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}
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destDB.PutEntity(destKey, src)
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raw, exists := db.ttlMap.Get(srcKey)
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if exists {
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expire := raw.(time.Time)
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destDB.Expire(destKey, expire)
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}
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mdb.aofHandler.AddAof(conn.GetDBIndex(), utils.ToCmdLine3("copy", args...))
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return protocol.MakeIntReply(1)
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}
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func init() {
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RegisterCommand("Del", execDel, writeAllKeys, undoDel, -2, flagWrite)
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RegisterCommand("Expire", execExpire, writeFirstKey, undoExpire, 3, flagWrite)
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RegisterCommand("ExpireAt", execExpireAt, writeFirstKey, undoExpire, 3, flagWrite)
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RegisterCommand("PExpire", execPExpire, writeFirstKey, undoExpire, 3, flagWrite)
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RegisterCommand("PExpireAt", execPExpireAt, writeFirstKey, undoExpire, 3, flagWrite)
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RegisterCommand("TTL", execTTL, readFirstKey, nil, 2, flagReadOnly)
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RegisterCommand("PTTL", execPTTL, readFirstKey, nil, 2, flagReadOnly)
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RegisterCommand("Persist", execPersist, writeFirstKey, undoExpire, 2, flagWrite)
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RegisterCommand("Exists", execExists, readAllKeys, nil, -2, flagReadOnly)
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RegisterCommand("Type", execType, readFirstKey, nil, 2, flagReadOnly)
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RegisterCommand("Rename", execRename, prepareRename, undoRename, 3, flagReadOnly)
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RegisterCommand("RenameNx", execRenameNx, prepareRename, undoRename, 3, flagReadOnly)
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RegisterCommand("Keys", execKeys, noPrepare, nil, 2, flagReadOnly)
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}
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