framework/net/gap/msg_forward.go at main · pangdogs/framework · GitHub

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/*
 * This file is part of Golaxy Distributed Service Development Framework.
 *
 * Golaxy Distributed Service Development Framework is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * Golaxy Distributed Service Development Framework is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Golaxy Distributed Service Development Framework. If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (c) 2024 pangdogs.
 */

package gap

import (
	"io"

	"git.golaxy.org/framework/utils/binaryutil"
)

// MsgForward 转发
type MsgForward struct {
	Src       Origin // 源信息
	Dst       string // 目标地址
	CorrId    int64  // 关联Id，用于支持Future等异步模型
	TransId   MsgId  // 传输消息Id
	TransData []byte // 传输消息内容（引用）
}

// Read implements io.Reader
func (m MsgForward) Read(p []byte) (int, error) {
	bs := binaryutil.NewBigEndianStream(p)
	if _, err := binaryutil.CopyToByteStream(&bs, m.Src); err != nil {
		return bs.BytesWritten(), err
	}
	if err := bs.WriteString(m.Dst); err != nil {
		return bs.BytesWritten(), err
	}
	if err := bs.WriteVarint(m.CorrId); err != nil {
		return bs.BytesWritten(), err
	}
	if err := bs.WriteUint32(m.TransId); err != nil {
		return bs.BytesWritten(), err
	}
	if err := bs.WriteBytes(m.TransData); err != nil {
		return bs.BytesWritten(), err
	}
	return bs.BytesWritten(), io.EOF
}

// Write implements io.Writer
func (m *MsgForward) Write(p []byte) (int, error) {
	bs := binaryutil.NewBigEndianStream(p)
	var err error

	_, err = bs.WriteTo(&m.Src)
	if err != nil {
		return bs.BytesRead(), err
	}

	m.Dst, err = bs.ReadString()
	if err != nil {
		return bs.BytesRead(), err
	}

	m.CorrId, err = bs.ReadVarint()
	if err != nil {
		return bs.BytesRead(), err
	}

	m.TransId, err = bs.ReadUint32()
	if err != nil {
		return bs.BytesRead(), err
	}

	m.TransData, err = bs.ReadBytesRef()
	if err != nil {
		return bs.BytesRead(), err
	}

	return bs.BytesRead(), nil
}

// Size 大小
func (m MsgForward) Size() int {
	return m.Src.Size() + binaryutil.SizeofString(m.Dst) + binaryutil.SizeofVarint(m.CorrId) + binaryutil.SizeofUint32 + binaryutil.SizeofBytes(m.TransData)
}

// MsgId 消息Id
func (MsgForward) MsgId() MsgId {
	return MsgId_Forward
}