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protocol: switch to binary MessageCommand

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closes #888
This commit is contained in:
Anna Shaleva 2020-05-19 14:54:51 +03:00
parent 1317666167
commit 3bcc56bdcf
5 changed files with 140 additions and 117 deletions
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148
pkg/network/message.go
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@ -11,20 +11,15 @@ import (
"github.com/nspcc-dev/neo-go/pkg/network/payload"
)
const (
// The minimum size of a valid message.
minMessageSize = 24
cmdSize = 12
)
//go:generate stringer -type=CommandType
// Message is the complete message send between nodes.
type Message struct {
// NetMode of the node that sends this message.
Magic config.NetMode
// Command is utf8 code, of which the length is 12 bytes,
// the extra part is filled with 0.
Command [cmdSize]byte
// Command is byte command code.
Command CommandType
// Length of the payload.
Length uint32
@ -34,30 +29,41 @@ type Message struct {
}
// CommandType represents the type of a message command.
type CommandType string
type CommandType byte
// Valid protocol commands used to send between nodes.
const (
CMDAddr CommandType = "addr"
CMDBlock CommandType = "block"
CMDConsensus CommandType = "consensus"
CMDFilterAdd CommandType = "filteradd"
CMDFilterClear CommandType = "filterclear"
CMDFilterLoad CommandType = "filterload"
CMDGetAddr CommandType = "getaddr"
CMDGetBlocks CommandType = "getblocks"
CMDGetData CommandType = "getdata"
CMDGetHeaders CommandType = "getheaders"
CMDHeaders CommandType = "headers"
CMDInv CommandType = "inv"
CMDMempool CommandType = "mempool"
CMDMerkleBlock CommandType = "merkleblock"
CMDPing CommandType = "ping"
CMDPong CommandType = "pong"
CMDTX CommandType = "tx"
CMDUnknown CommandType = "unknown"
CMDVerack CommandType = "verack"
CMDVersion CommandType = "version"
// handshaking
CMDVersion CommandType = 0x00
CMDVerack CommandType = 0x01
// connectivity
CMDGetAddr CommandType = 0x10
CMDAddr CommandType = 0x11
CMDPing CommandType = 0x18
CMDPong CommandType = 0x19
// synchronization
CMDGetHeaders CommandType = 0x20
CMDHeaders CommandType = 0x21
CMDGetBlocks CommandType = 0x24
CMDMempool CommandType = 0x25
CMDInv CommandType = 0x27
CMDGetData CommandType = 0x28
CMDUnknown CommandType = 0x2a
CMDTX CommandType = 0x2b
CMDBlock CommandType = 0x2c
CMDConsensus CommandType = 0x2d
CMDReject CommandType = 0x2f
// SPV protocol
CMDFilterLoad CommandType = 0x30
CMDFilterAdd CommandType = 0x31
CMDFilterClear CommandType = 0x32
CMDMerkleBlock CommandType = 0x38
// others
CMDAlert CommandType = 0x40
)
// NewMessage returns a new message with the given payload.
@ -78,63 +84,16 @@ func NewMessage(magic config.NetMode, cmd CommandType, p payload.Payload) *Messa
return &Message{
Magic: magic,
Command: cmdToByteArray(cmd),
Command: cmd,
Length: size,
Payload: p,
}
}
// CommandType converts the 12 byte command slice to a CommandType.
func (m *Message) CommandType() CommandType {
cmd := cmdByteArrayToString(m.Command)
switch cmd {
case "addr":
return CMDAddr
case "block":
return CMDBlock
case "consensus":
return CMDConsensus
case "filteradd":
return CMDFilterAdd
case "filterclear":
return CMDFilterClear
case "filterload":
return CMDFilterLoad
case "getaddr":
return CMDGetAddr
case "getblocks":
return CMDGetBlocks
case "getdata":
return CMDGetData
case "getheaders":
return CMDGetHeaders
case "headers":
return CMDHeaders
case "inv":
return CMDInv
case "mempool":
return CMDMempool
case "merkleblock":
return CMDMerkleBlock
case "ping":
return CMDPing
case "pong":
return CMDPong
case "tx":
return CMDTX
case "verack":
return CMDVerack
case "version":
return CMDVersion
default:
return CMDUnknown
}
}
// Decode decodes a Message from the given reader.
func (m *Message) Decode(br *io.BinReader) error {
m.Magic = config.NetMode(br.ReadU32LE())
br.ReadBytes(m.Command[:])
m.Command = CommandType(br.ReadB())
m.Length = br.ReadU32LE()
if br.Err != nil {
return br.Err
@ -155,7 +114,7 @@ func (m *Message) decodePayload(br *io.BinReader) error {
r := io.NewBinReaderFromBuf(buf)
var p payload.Payload
switch m.CommandType() {
switch m.Command {
case CMDVersion:
p = &payload.Version{}
case CMDInv, CMDGetData:
@ -179,7 +138,7 @@ func (m *Message) decodePayload(br *io.BinReader) error {
case CMDPing, CMDPong:
p = &payload.Ping{}
default:
return fmt.Errorf("can't decode command %s", cmdByteArrayToString(m.Command))
return fmt.Errorf("can't decode command %s", m.Command.String())
}
p.DecodeBinary(r)
if r.Err == nil || r.Err == payload.ErrTooManyHeaders {
@ -192,7 +151,7 @@ func (m *Message) decodePayload(br *io.BinReader) error {
// Encode encodes a Message to any given BinWriter.
func (m *Message) Encode(br *io.BinWriter) error {
br.WriteU32LE(uint32(m.Magic))
br.WriteBytes(m.Command[:])
br.WriteB(byte(m.Command))
br.WriteU32LE(m.Length)
if m.Payload != nil {
m.Payload.EncodeBinary(br)
@ -215,30 +174,3 @@ func (m *Message) Bytes() ([]byte, error) {
}
return w.Bytes(), nil
}
// convert a command (string) to a byte slice filled with 0 bytes till
// size 12.
func cmdToByteArray(cmd CommandType) [cmdSize]byte {
cmdLen := len(cmd)
if cmdLen > cmdSize {
panic("exceeded command max length of size 12")
}
// The command can have max 12 bytes, rest is filled with 0.
b := [cmdSize]byte{}
for i := 0; i < cmdLen; i++ {
b[i] = cmd[i]
}
return b
}
func cmdByteArrayToString(cmd [cmdSize]byte) string {
buf := make([]byte, 0, cmdSize)
for i := 0; i < cmdSize; i++ {
if cmd[i] != 0 {
buf = append(buf, cmd[i])
}
}
return string(buf)
}