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113 lines
3.6 KiB
113 lines
3.6 KiB
package host
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import (
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"encoding/binary"
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"net"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/harmony-one/harmony/p2p"
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)
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// SendMessage is to connect a socket given a port and send the given message.
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// TODO(minhdoan, rj): need to check if a peer is reachable or not.
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func SendMessage(host p2p.Host, p p2p.Peer, message []byte, lostPeer chan p2p.Peer) {
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// Construct normal p2p message
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content := ConstructP2pMessage(byte(0), message)
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go send(host, p, content, lostPeer)
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}
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// BroadcastMessage sends the message to a list of peers
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func BroadcastMessage(h p2p.Host, peers []p2p.Peer, msg []byte, lostPeer chan p2p.Peer) {
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if len(peers) == 0 {
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return
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}
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// Construct broadcast p2p message
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content := ConstructP2pMessage(byte(17), msg)
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length := len(content)
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// log.Info("Start Broadcasting", "gomaxprocs", runtime.GOMAXPROCS(0), "Size", length)
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// start := time.Now()
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for _, peer := range peers {
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peerCopy := peer
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go send(h, peerCopy, content, lostPeer)
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}
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// log.Info("Broadcasting Done", "time spent(s)", time.Since(start).Seconds())
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// Keep track of block propagation time
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// Assume 1M message is for block propagation
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if length > 1000000 {
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log.Debug("NET: START BLOCK PROPAGATION", "Size", length)
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}
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}
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// BroadcastMessageFromLeader sends the message to a list of peers from a leader.
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func BroadcastMessageFromLeader(h p2p.Host, peers []p2p.Peer, msg []byte, lostPeer chan p2p.Peer) {
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// TODO(minhdoan): Enable back for multicast.
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peers = SelectMyPeers(peers, 1, MaxBroadCast)
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BroadcastMessage(h, peers, msg, lostPeer)
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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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message := make([]byte, 5+len(content))
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message[0] = 17 // messageType 0x11
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binary.BigEndian.PutUint32(message[1:5], uint32(len(content)))
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copy(message[5:], content)
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return message
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}
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// BroadcastMessageFromValidator sends the message to a list of peers from a validator.
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func BroadcastMessageFromValidator(h p2p.Host, selfPeer p2p.Peer, peers []p2p.Peer, msg []byte) {
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peers = SelectMyPeers(peers, selfPeer.ValidatorID*MaxBroadCast+1, (selfPeer.ValidatorID+1)*MaxBroadCast)
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BroadcastMessage(h, peers, msg, nil)
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}
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// MaxBroadCast is the maximum number of neighbors to broadcast
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const MaxBroadCast = 20
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// SelectMyPeers chooses a list of peers based on the range of ValidatorID
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// This is a quick hack of the current p2p networking model
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func SelectMyPeers(peers []p2p.Peer, min int, max int) []p2p.Peer {
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res := []p2p.Peer{}
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for _, peer := range peers {
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if peer.ValidatorID >= min && peer.ValidatorID <= max {
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res = append(res, peer)
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}
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}
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return res
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}
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// Send a message to another node with given port.
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func send(h p2p.Host, peer p2p.Peer, message []byte, lostPeer chan p2p.Peer) {
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// Add attack code here.
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//attack.GetInstance().Run()
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backoff := p2p.NewExpBackoff(250*time.Millisecond, 5*time.Second, 2)
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for trial := 0; trial < 3; trial++ {
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err := h.SendMessage(peer, message)
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// No need to retry if new stream error or no error
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if err == nil || err == p2p.ErrNewStream {
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if trial > 0 {
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log.Warn("retry send", "rety", trial)
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}
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return
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}
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log.Info("sleeping before trying to send again",
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"duration", backoff.Cur, "addr", net.JoinHostPort(peer.IP, peer.Port))
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backoff.Sleep()
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}
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log.Error("gave up sending a message", "addr", net.JoinHostPort(peer.IP, peer.Port))
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if lostPeer != nil {
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// Notify lostPeer channel
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lostPeer <- peer
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}
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}
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// DialWithSocketClient joins host port and establishes connection
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func DialWithSocketClient(ip, port string) (conn net.Conn, err error) {
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addr := net.JoinHostPort(ip, port)
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conn, err = net.Dial("tcp", addr)
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return
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}
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