forked from alexbakker/gonano
/
proto.go
162 lines (136 loc) · 3.01 KB
/
proto.go
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package proto
import (
"fmt"
"net"
)
type Network rune
const (
NetworkTest = 'Y'
NetworkBeta = 'Z'
NetworkLive = 'X'
)
var (
networkNames = map[Network]string{
NetworkTest: "test",
NetworkBeta: "beta",
NetworkLive: "live",
}
)
type Proto struct {
net Network
magic [2]byte
versions Versions
}
type Versions struct {
Max byte
Using byte
Min byte
}
func New(net Network) *Proto {
return &Proto{
net: net,
magic: [...]byte{'B', byte(net)},
versions: Versions{
Max: 0x07,
Using: 0x07,
Min: 0x07,
},
}
}
func (p *Proto) NewHeader(packetType byte) *Header {
return &Header{
Magic: p.magic,
VersionMax: p.versions.Max,
VersionUsing: p.versions.Using,
VersionMin: p.versions.Min,
MessageType: packetType,
}
}
func (p *Proto) NewKeepAlivePacket(peers []*net.UDPAddr) *KeepAlivePacket {
return &KeepAlivePacket{
Peers: peers,
}
}
func (p *Proto) UnmarshalPacket(data []byte) (Packet, error) {
if len(data) < HeaderSize {
return nil, ErrBadLength
}
header := Header{}
if err := header.UnmarshalBinary(data[:HeaderSize]); err != nil {
return nil, err
}
// check the magic
// todo: check version
if header.Magic != p.magic {
return nil, ErrBadMagic
}
// strip off the header
data = data[HeaderSize:]
var packet Packet
switch header.MessageType {
case idPacketKeepAlive:
packet = new(KeepAlivePacket)
case idPacketPublish:
packet = &PublishPacket{Type: header.BlockType()}
case idPacketConfirmReq:
packet = &ConfirmReqPacket{Type: header.BlockType()}
case idPacketConfirmAck:
packet = &ConfirmAckPacket{Type: header.BlockType()}
case idPacketBulkPull:
packet = new(BulkPullPacket)
//case idPacketBulkPush:
case idPacketFrontierReq:
packet = new(FrontierReqPacket)
case idPacketBulkPullBlocks:
packet = new(BulkPullBlocksPacket)
case idPacketNodeIDHandshake:
packet = new(HandshakePacket)
default:
return nil, ErrBadType
}
if err := packet.UnmarshalBinary(data); err != nil {
return nil, err
}
return packet, nil
}
func (p *Proto) MarshalPacket(packet Packet) ([]byte, error) {
header := p.NewHeader(packet.ID())
switch t := packet.(type) {
case *ConfirmReqPacket:
header.SetBlockType(t.Type)
case *PublishPacket:
header.SetBlockType(t.Type)
}
headerBytes, err := header.MarshalBinary()
if err != nil {
return nil, err
}
packetBytes, err := packet.MarshalBinary()
if err != nil {
return nil, err
}
return append(headerBytes, packetBytes...), nil
}
// MarshalText implements the encoding.TextMarshaler interface.
func (n Network) MarshalText() ([]byte, error) {
return []byte(n.String()), nil
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
func (n *Network) UnmarshalText(text []byte) error {
s := string(text)
for k, v := range networkNames {
if v == s {
*n = k
return nil
}
}
return fmt.Errorf("unknown network: %s", s)
}
// String implements the fmt.Stringer interface.
func (n Network) String() string {
s, ok := networkNames[n]
if !ok {
return "unknown"
}
return s
}