proto.go

// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package proto

import (
	"io"
	"io/ioutil"

	"github.com/gogo/protobuf/proto"
	"github.com/vine-io/vine/core/codec"
)

type Codec struct {
	Conn io.ReadWriteCloser
}

func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
	return nil
}

func (c *Codec) ReadBody(b interface{}) error {
	if b == nil {
		return nil
	}
	buf, err := ioutil.ReadAll(c.Conn)
	if err != nil {
		return err
	}
	m, ok := b.(proto.Message)
	if !ok {
		return codec.ErrInvalidMessage
	}
	return proto.Unmarshal(buf, m)
}

func (c *Codec) Write(m *codec.Message, b interface{}) error {
	p, ok := b.(proto.Message)
	if !ok {
		return codec.ErrInvalidMessage
	}
	buf, err := proto.Marshal(p)
	if err != nil {
		return err
	}
	_, err = c.Conn.Write(buf)
	return err
}

func (c *Codec) Close() error {
	return c.Conn.Close()
}

func (c *Codec) String() string {
	return "proto"
}

func NewCodec(c io.ReadWriteCloser) codec.Codec {
	return &Codec{
		Conn: c,
	}
}