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87 lines
2.1 KiB
87 lines
2.1 KiB
package p2p
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import (
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"bytes"
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"encoding/binary"
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"harmony-benchmark/attack"
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"log"
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"net"
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"strings"
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"sync"
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)
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// Peer is the object for a p2p peer (node)
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type Peer struct {
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Ip string // Ip address of the peer
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Port string // Port number of the peer
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PubKey string // Public key of the peer
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}
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// SendMessage sends the message to the peer
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func SendMessage(peer Peer, msg []byte) {
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// Construct normal p2p message
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content := ConstructP2pMessage(byte(0), msg)
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send(peer.Ip, peer.Port, content)
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}
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// BroadcastMessage sends the message to a list of peers
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func BroadcastMessage(peers []Peer, msg []byte) {
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// Construct broadcast p2p message
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content := ConstructP2pMessage(byte(17), msg)
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var wg sync.WaitGroup
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wg.Add(len(peers))
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for _, peer := range peers {
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peerCopy := peer
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go func() {
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defer wg.Done()
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send(peerCopy.Ip, peerCopy.Port, content)
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}()
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}
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wg.Wait()
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}
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// ConstructP2pMessage constructs the p2p message as [messageType, contentSize, content]
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func ConstructP2pMessage(msgType byte, content []byte) []byte {
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firstByte := byte(17) // messageType 0x11
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sizeBytes := make([]byte, 4) // contentSize
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binary.BigEndian.PutUint32(sizeBytes, uint32(len(content)))
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byteBuffer := bytes.NewBuffer([]byte{})
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byteBuffer.WriteByte(firstByte)
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byteBuffer.Write(sizeBytes)
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byteBuffer.Write(content)
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return byteBuffer.Bytes()
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}
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// SocketClient is to connect a socket given a port and send the given message.
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func sendWithSocketClient(ip, port string, message []byte) (res string) {
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//log.Printf("Sending message to ip %s and port %s\n", ip, port)
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addr := strings.Join([]string{ip, port}, ":")
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conn, err := net.Dial("tcp", addr)
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if err != nil {
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log.Println(err)
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return
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}
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defer conn.Close()
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conn.Write(message)
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//log.Printf("Sent to ip %s and port %s: %s\n", ip, port, message)
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// No ack (reply) message from the receiver for now.
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return
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}
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// Send a message to another node with given port.
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func send(ip, port string, message []byte) (returnMessage string) {
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// Add attack code here.
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attack.GetAttackModel().DelayResponse()
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sendWithSocketClient(ip, port, message)
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return
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}
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