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message.go
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message.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package message
import (
"errors"
"github.com/ava-labs/avalanchego/ids"
)
var (
_ Message = &Tx{}
errUnexpectedCodecVersion = errors.New("unexpected codec version")
)
type Message interface {
// Handle this message with the correct message handler
Handle(handler Handler, nodeID ids.NodeID, requestID uint32) error
// initialize should be called whenever a message is built or parsed
initialize([]byte)
// Bytes returns the binary representation of this message
//
// Bytes should only be called after being initialized
Bytes() []byte
}
type message []byte
func (m *message) initialize(bytes []byte) { *m = bytes }
func (m *message) Bytes() []byte { return *m }
type Tx struct {
message
Tx []byte `serialize:"true"`
}
func (msg *Tx) Handle(handler Handler, nodeID ids.NodeID, requestID uint32) error {
return handler.HandleTx(nodeID, requestID, msg)
}
func Parse(bytes []byte) (Message, error) {
var msg Message
version, err := c.Unmarshal(bytes, &msg)
if err != nil {
return nil, err
}
if version != codecVersion {
return nil, errUnexpectedCodecVersion
}
msg.initialize(bytes)
return msg, nil
}
func Build(msg Message) ([]byte, error) {
bytes, err := c.Marshal(codecVersion, &msg)
msg.initialize(bytes)
return bytes, err
}