package packet

import "errors"

var (
	// ErrWrongPacketType represents a wrong packet type.
	ErrWrongPacketType = errors.New("wrong packet type")
	// ErrPacketSizeExceed represents a wrong packet size.
	ErrPacketSizeExceed = errors.New("packet size exceed")
)

type (
	// IPacket 数据帧
	IPacket interface {
		GetHeader() any  // 数据帧头部 Header
		GetLen() uint64  // 数据帧长度 8bytes，根据实际情况进行转换
		GetBody() []byte // 数据 Body
	}

	// Packer 数据帧 封包/解包
	Packer interface {
		// Pack 封包，将原始数据构造为二进制流数据帧
		Pack(header any, data []byte) ([]byte, error)

		// Unpack 解包
		Unpack(data []byte) ([]IPacket, error)
	}

	// PackerBuilder Packer构建器
	PackerBuilder func() Packer
)