add error variables for p2p/host

no retry on newstream error
reduce number of retry

Signed-off-by: Leo Chen <leo@harmony.one>

p2p/errors.go

@@ -0,0 +1,9 @@
+package p2p
+
+import "errors"
+
+// Error of host package
+var (
+	ErrNewStream = errors.New("[HOST]: new stream error")
+	ErrMsgWrite  = errors.New("[HOST]: send message write error")
+)

p2p/host/hostv2/hostv2.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/harmony-one/harmony/p2p"
+
 	libp2p "github.com/libp2p/go-libp2p"
 	p2p_crypto "github.com/libp2p/go-libp2p-crypto"
 	p2p_host "github.com/libp2p/go-libp2p-host"
@@ -186,12 +187,11 @@ func (host *HostV2) SendMessage(p p2p.Peer, message []byte) error {
 	if err != nil {
 		logger.Error("NewStream() failed", "peerID", p.PeerID,
 			"protocolID", ProtocolID, "error", err)
-		return fmt.Errorf("NewStream(%v, %v) failed: %v", p.PeerID,
-			ProtocolID, err)
+		return p2p.ErrNewStream
 	}
 	if nw, err := s.Write(message); err != nil {
 		logger.Error("Write() failed", "error", err)
-		return fmt.Errorf("Write() failed: %v", err)
+		return p2p.ErrMsgWrite
 	} else if nw < len(message) {
 		logger.Error("Short Write()", "expected", len(message), "actual", nw)
 		return io.ErrShortWrite

p2p/host/message.go

@@ -83,10 +83,12 @@ func SelectMyPeers(peers []p2p.Peer, min int, max int) []p2p.Peer {
 func send(h p2p.Host, peer p2p.Peer, message []byte, lostPeer chan p2p.Peer) {
 	// Add attack code here.
 	//attack.GetInstance().Run()
-	backoff := p2p.NewExpBackoff(150*time.Millisecond, 5*time.Second, 2)
+	backoff := p2p.NewExpBackoff(250*time.Millisecond, 5*time.Second, 2)
 
-	for trial := 0; trial < 10; trial++ {
-		if err := h.SendMessage(peer, message); err == nil {
+	for trial := 0; trial < 3; trial++ {
+		err := h.SendMessage(peer, message)
+		// No need to retry if new stream error or no error
+		if err == nil || err == p2p.ErrNewStream {
 			if trial > 0 {
 				log.Warn("retry send", "rety", trial)
 			}

p2p/host/message_test.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/harmony-one/harmony/internal/utils"
 	"github.com/harmony-one/harmony/p2p"
-	"github.com/harmony-one/harmony/p2p/host/hostv2"
+	"github.com/harmony-one/harmony/p2p/p2pimpl"
 
 	peer "github.com/libp2p/go-libp2p-peer"
 	multiaddr "github.com/multiformats/go-multiaddr"
@@ -21,7 +21,7 @@ func TestSendMessage(test *testing.T) {
 	priKey1, pubKey1, _ := utils.GenKeyP2P(peer1.IP, peer1.Port)
 	peerID1, _ := peer.IDFromPublicKey(pubKey1)
 	peer1.PeerID = peerID1
-	host1 := hostv2.New(&peer1, priKey1)
+	host1, _ := p2pimpl.NewHost(&peer1, priKey1)
 
 	peer2 := p2p.Peer{IP: "127.0.0.1", Port: "9001"}
 	selfAddr2, _ := multiaddr.NewMultiaddr(fmt.Sprintf("/ip4/0.0.0.0/tcp/%s", peer2.Port))
@@ -29,7 +29,7 @@ func TestSendMessage(test *testing.T) {
 	priKey2, pubKey2, _ := utils.GenKeyP2P(peer2.IP, peer2.Port)
 	peerID2, _ := peer.IDFromPublicKey(pubKey2)
 	peer2.PeerID = peerID2
-	host2 := hostv2.New(&peer2, priKey2)
+	host2, _ := p2pimpl.NewHost(&peer2, priKey2)
 
 	msg := []byte{0x00, 0x01, 0x02, 0x03, 0x04}
 	if err := host1.AddPeer(&peer2); err != nil {