turn reply.MakeErrReply("no such key")
}
db.PutEntity(dest, entity)
db.Remove(src)
return &reply.OkReply{}
}
// execRenameNx：renamenx k1 k2
func execRenameNx(db *DB, args [][]byte) resp.Reply {
src := string(args[0])
dest := string(args[1])
_, exist := db.GetEntity(dest)
if exist {
return reply.MakeIntReply(0)
}
entity, ok := db.GetEntity(src)
if !ok {
return reply.MakeErrReply("no such key")
}
db.Removes(src, dest)
db.PutEntity(dest, entity)
return reply.MakeIntReply(1)
}
// execKeys：keys
func execKeys(db *DB, args [][]byte) resp.Reply {
pattern := wildcard.CompilePattern(string(args[0]))
result := make([][]byte, 0)
db.data.ForEach(func(key string, val interface{}) bool {
if pattern.IsMatch(key) {
result = append(result, []byte(key))
}
return true
})
return reply.MakeMultiBulkReply(result)
}
func init() {
RegisterCommand("Del", execDel, -2)
RegisterCommand("Exists", execExists, -2)
RegisterCommand("Keys", execKeys, 2)
RegisterCommand("FlushDB", execFlushDB, -1)
RegisterCommand("Type", execType, 2)
RegisterCommand("Rename", execRename, 3)
RegisterCommand("RenameNx", execRenameNx, 3)
}
keys.go实现以下指令：
execDel：del k1 k2 k3 ...
execExists：exist k1 k2 k3 ...
execFlushDB：flushdb
execType：type k1
execRename：rename k1 k2
execRenameNx：renamenx k1 k2
execKeys：keys（依赖lib包的工具类wildcard.go）
database/string.go
// execGet：get k1
func execGet(db *DB, args [][]byte) resp.Reply {
key := string(args[0])
bytes, err := db.getAsString(key)
if err != nil {
return err
}
if bytes == nil {
return &reply.NullBulkReply{}
}
return reply.MakeBulkReply(bytes)
}
// execSet：set k v
func (db *DB) getAsString(key string) ([]byte, reply.ErrorReply) {
entity, ok := db.GetEntity(key)
if !ok {
return nil, nil
}
bytes, ok := entity.Data.([]byte)
if !ok {
return nil, &reply.WrongTypeErrReply{}
}
return bytes, nil
}
func execSet(db *DB, args [][]byte) resp.Reply {
key := string(args[0])
value := args[1]
entity := &database.DataEntity{
Data: value,
}
db.PutEntity(key, entity)
return &reply.OkReply{}
}
// execSetNX：setnex k v
func execSetNX(db *DB, args [][]byte) resp.Reply {
key := string(args[0])
value := args[1]
entity := &database.DataEntity{
Data: value,
}
result := db.PutIfAbsent(key, entity)
return reply.MakeIntReply(int64(result))
}
// execGetSet：getset k v 返回旧值
func execGetSet(db *DB, args [][]byte) resp.Reply {
key := string(args[0])
value := args[1]
entity, exists := db.GetEntity(key)
db.PutEntity(key, &database.DataEntity{Data: value})
if !exists {
return reply.MakeNullBulkReply()
}
old := entity.Data.([]byte)
return reply.MakeBulkReply(old)
}
// execStrLen：strlen k
func execStrLen(db *DB, args [][]byte) resp.Reply {
key := string(args[0])
entity, exists := db.GetEntity(key)
if !exists {
return reply.MakeNullBulkReply()
}
old := entity.Data.([]byte)
return reply.MakeIntReply(int64(len(old)))
}
func init() {
RegisterCommand("Get", execGet, 2)
RegisterCommand("Set", execSet, -3)
RegisterCommand("SetNx", execSetNX, 3)
RegisterCommand("GetSet", execGetSet, 3)
RegisterCommand("StrLen", execStrLen, 2)
}
string.go实现以下指令：
execGet：get k1
execS