Golang carrier-command-command.Command类(方法)实例源码

func MSetCommand(cmd command.Command, msg protocol.Message) (msgAck protocol.Message) {
	var elements []protocol.Message = msg.GetArraysValue()
	if msg.GetIntegersValue()%2 != 1 {
		return protocol.NewMessageString(protocol.ERR_wrong_number_command, cmd.Name())
	}

	var (
		keyIndex       int64
		hashSlot       uint16
		classification map[uint16]protocol.Message = make(map[uint16]protocol.Message)
		msgSpice       protocol.Message
		ok             bool
	)
	for keyIndex = 1; keyIndex < msg.GetIntegersValue(); keyIndex += 2 {
		hashSlot = crc16.HashSlot(elements[keyIndex].GetBytesValue())
		if msgSpice, ok = classification[hashSlot]; !ok {
			msgSpice = protocol.NewMessage().AppendArraysValue(elements[0])
		}
		classification[hashSlot] = msgSpice.AppendArraysValue(elements[keyIndex]).AppendArraysValue(elements[keyIndex+1])
	}
	// 按slot分命令
	var node nodes.Nodes
	for hashSlot, msgSpice = range classification {
		if node, ok = cluster.GetClusterParameter().GetSlot(hashSlot); !ok {
			logger.Warningf("获取不到slot节点: %d", hashSlot)
			continue
		}
		forwardMsg(msgSpice, node, cmd.CheckReadonly())
	}
	return protocol.OK
}

func DelCommand(cmd command.Command, msg protocol.Message) (msgAck protocol.Message) {
	var (
		elements       []protocol.Message = msg.GetArraysValue()
		element        protocol.Message
		hashSlot       uint16
		classification map[uint16]protocol.Message = make(map[uint16]protocol.Message)
		msgSpice       protocol.Message
		ok             bool
	)
	for _, element = range elements[1:] {
		hashSlot = crc16.HashSlot(element.GetBytesValue())
		if msgSpice, ok = classification[hashSlot]; !ok {
			msgSpice = protocol.NewMessage().AppendArraysValue(elements[0])
		}
		classification[hashSlot] = msgSpice.AppendArraysValue(element)
	}
	// 按slot分命令
	var (
		node        nodes.Nodes
		msgAckSplit protocol.Message
	)
	msgAck = protocol.NewMessage()
	for hashSlot, msgSpice = range classification {
		if node, ok = cluster.GetClusterParameter().GetSlot(hashSlot); !ok {
			logger.Warningf("获取不到slot节点: %d", hashSlot)
			continue
		}
		msgAckSplit = forwardMsg(msgSpice, node, cmd.CheckReadonly())
		msgAck.AppendIntegersValue(msgAckSplit)
	}
	return
}

func PingCommand(cmd command.Command, msg protocol.Message) protocol.Message {
	if msg.GetIntegersValue() > 2 {
		return protocol.NewMessageString(protocol.ERR_wrong_number_command, cmd.Name())
	}
	if msg.GetIntegersValue() == 2 {
		return msg.GetArraysValue()[1]
	}
	return protocol.PONG
}

func MGetCommand(cmd command.Command, msg protocol.Message) (msgAck protocol.Message) {
	var (
		elements       []protocol.Message = msg.GetArraysValue()
		element        protocol.Message
		hashSlot       uint16
		classification map[uint16]protocol.Message = make(map[uint16]protocol.Message)
		msgSpice       protocol.Message
		ok             bool
	)
	for _, element = range elements[1:] {
		hashSlot = crc16.HashSlot(element.GetBytesValue())
		if msgSpice, ok = classification[hashSlot]; !ok {
			msgSpice = protocol.NewMessage().AppendArraysValue(elements[0])
		}
		classification[hashSlot] = msgSpice.AppendArraysValue(element)
	}
	// 按slot分命令
	var (
		node        nodes.Nodes
		msgAckSplit protocol.Message
		msgAckMap   map[protocol.Message]protocol.Message = make(map[protocol.Message]protocol.Message)

		msgKey   int
		msgValue protocol.Message
	)
	for hashSlot, msgSpice = range classification {
		if node, ok = cluster.GetClusterParameter().GetSlot(hashSlot); !ok {
			logger.Warningf("获取不到slot节点: %d", hashSlot)
			continue
		}
		msgAckSplit = forwardMsg(msgSpice, node, cmd.CheckReadonly())
		if msgAckSplit.GetProtocolType() != protocol.ArraysType {
			logger.Warningf("命令结果预期不符: %v", msgSpice)
			continue
		}
		if msgSpice.GetIntegersValue()-1 != msgAckSplit.GetIntegersValue() {
			logger.Warningf("命令结果预期不符: %v", msgSpice)
			continue
		}
		for msgKey, msgValue = range msgSpice.GetArraysValue()[1:] {
			msgAckMap[msgValue] = msgAckSplit.GetArraysValue()[msgKey]
		}
	}
	// 整合结果
	msgAck = protocol.NewMessage()
	for _, element = range elements[1:] {
		if msgValue, ok = msgAckMap[element]; ok {
			msgAck.AppendArraysValue(msgAckMap[element])
		} else {
			msgAck.AppendArraysValue(protocol.NullBulkString)
		}
	}
	return
}

func ProcKeyCommand(cmd command.Command, msg protocol.Message) (msgAck protocol.Message) {
	var (
		slot uint16 = crc16.HashSlot(msg.GetArraysValue()[1].GetBytesValue()) // 第一个参数是Key
		node nodes.Nodes
		ok   bool
	)
	if node, ok = cluster.GetClusterParameter().GetSlot(slot); !ok {
		logger.Warningf("获取不到slot节点: %d", slot)
		return protocol.ERR_ClusterSlots
	}
	return forwardMsg(msg, node, cmd.CheckReadonly())
}

func ForbiddenCommand(cmd command.Command, msg protocol.Message) protocol.Message {
	return protocol.NewMessageString(protocol.ERR_forbidden_command, cmd.Name())
}

func init() {
	var cmd command.Command
	for _, cmd = range CommandTable {
		commandSet.AddCommand(cmd.Name(), cmd)
	}
}

func ProcessCommand(msg protocol.Message) protocol.Message {
	var (
		name []byte
		argc int64
		cmd  command.Command
		ok   bool
	)
	switch msg.GetProtocolType() {
	case protocol.ArraysType:
		if argc = msg.GetIntegersValue(); argc > 0 {
			name = msg.GetArraysValue()[0].GetBytesValue()
		}
	}

	if cmd, ok = commandSet.SearchCommand(name); !ok {
		return protocol.NewMessageString(protocol.ERR_unknown_command, name)
	}
	if !cmd.CheckArgc(argc) {
		return protocol.NewMessageString(protocol.ERR_wrong_number_command, cmd.Name())
	}
	if cmd.CheckForbidden() {
		return protocol.NewMessageString(protocol.ERR_forbidden_command, cmd.Name())
	}
	return cmd.Proc(cmd, msg)
}