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message.go
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message.go
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// (c) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package message
import (
"errors"
"github.com/ethereum/go-ethereum/common"
"github.com/lasthyphen/dijetalgo/ids"
"github.com/lasthyphen/dijetalgo/utils/units"
)
const (
// EthMsgSoftCapSize is the ideal size of encoded transaction bytes we send in
// any [EthTxs] or [AtomicTx] message. We do not limit inbound messages to
// this size, however. Max inbound message size is enforced by the codec
// (512KB).
EthMsgSoftCapSize = common.StorageSize(64 * units.KiB)
)
var (
_ Message = &AtomicTx{}
_ Message = &EthTxs{}
errUnexpectedCodecVersion = errors.New("unexpected codec version")
)
type Message interface {
// Handle this message with the correct message handler
Handle(handler Handler, nodeID ids.ShortID, 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 AtomicTx struct {
message
Tx []byte `serialize:"true"`
}
func (msg *AtomicTx) Handle(handler Handler, nodeID ids.ShortID, requestID uint32) error {
return handler.HandleAtomicTx(nodeID, requestID, msg)
}
type EthTxs struct {
message
Txs []byte `serialize:"true"`
}
func (msg *EthTxs) Handle(handler Handler, nodeID ids.ShortID, requestID uint32) error {
return handler.HandleEthTxs(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
}