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transport.go
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transport.go
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/*
Copyright Xilinx Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package fmprotocol
import (
"bytes"
"encoding/binary"
"net"
)
// BcmSession keeps blockchain machine protocol session information
type BcmSession struct {
addr string
sequence uint16
info uint32
udpConn *net.UDPConn
}
// BcmSessionMap records IP to blockchain machine protocol session relation
var BcmSessionMap map[string]BcmSession
type BcmTransportHeader struct {
sequence uint16
ctrl_type uint8
annotation_size uint8
}
// transportHeaderToBytes formats blockchain machine protocol header to binary
func transportHeaderToBytes(hdr BcmTransportHeader) (data []byte) {
buf := &bytes.Buffer{}
binary.Write(buf, binary.BigEndian, hdr)
data = buf.Bytes()
return data
}
// bcmSessionFindOrCreate searches session map for IP, creates a new session if not existed
func bcmSessionFindOrCreate(addr string) (session BcmSession) {
if BcmSessionMap == nil {
BcmSessionMap = make(map[string]BcmSession)
}
if BcmSessionMap[addr].addr != addr {
udpAddr, _ := net.ResolveUDPAddr("udp4", addr)
udpConn, err := net.DialUDP("udp", nil, udpAddr)
if err != nil {
return
}
BcmSessionMap[addr] = BcmSession{addr, 0, 0, udpConn}
}
return BcmSessionMap[addr]
}
// bcmSessionSend forms a packet from blockchain machine protocol message and send out via protocol session
func bcmSessionSend(session BcmSession, msgType byte, annotation_data []byte, annotation_num int, payload []byte) {
control := 0
bcmHeader := BcmTransportHeader{session.sequence, uint8(byte(control<<4) | msgType), uint8(annotation_num)}
var buff []byte
buff = append(buff, transportHeaderToBytes(bcmHeader)...)
buff = append(buff, annotation_data...)
buff = append(buff, payload...)
length, err := session.udpConn.Write(buff)
if err != nil {
return
}
if length > 9000 {
logger.Errorf("error: UDP too large")
} else {
logger.Debugf("send ok: ", len(annotation_data), len(payload), length)
}
}
// bcmSend sends a blockchain machine protocol message to destination IP address
func bcmSend(addr string, msgType byte, annotation_data []byte, annotation_num int, payload []byte) {
session := bcmSessionFindOrCreate(addr)
bcmSessionSend(session, msgType, annotation_data, annotation_num, payload)
}