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/
node.go
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/
node.go
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// Copyright (C) 2018 MediBloc
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>
package net
import (
"context"
"io/ioutil"
"os"
"path"
"time"
"github.com/gogo/protobuf/proto"
libp2p "github.com/libp2p/go-libp2p"
connmgr "github.com/libp2p/go-libp2p-connmgr"
host "github.com/libp2p/go-libp2p-host"
dht "github.com/libp2p/go-libp2p-kad-dht"
dhtopts "github.com/libp2p/go-libp2p-kad-dht/opts"
inet "github.com/libp2p/go-libp2p-net"
peer "github.com/libp2p/go-libp2p-peer"
peerstore "github.com/libp2p/go-libp2p-peerstore"
"github.com/libp2p/go-libp2p/p2p/protocol/ping"
medletpb "github.com/medibloc/go-medibloc/medlet/pb"
netpb "github.com/medibloc/go-medibloc/net/pb"
"github.com/medibloc/go-medibloc/util/logging"
multiaddr "github.com/multiformats/go-multiaddr"
"github.com/sirupsen/logrus"
)
// Node the host can be used as both the client and the server
type Node struct {
cfg *medletpb.Config
recvMessageCh chan<- Message
host.Host
context context.Context
dht *dht.IpfsDHT
dhtTicker chan time.Time
messageSender *messageSender
messageReceiver *messageReceiver
chainID uint32
bloomFilter *BloomFilter
bootstrapConfig *BootstrapConfig
cacheFile string
cachePeriod time.Duration
}
// Addrs returns opened addrs (w/o p2p-circuit)
func (node *Node) Addrs() []multiaddr.Multiaddr {
addrs := make([]multiaddr.Multiaddr, 0)
for _, v := range node.Host.Addrs() {
if v.String() == "/p2p-circuit" {
continue
}
addrs = append(addrs, v)
}
return addrs
}
// DHT returns distributed hashed table
func (node *Node) DHT() *dht.IpfsDHT {
return node.dht
}
// PeersCount return stream count.
// Depreciated
func (node *Node) PeersCount() int32 {
return int32(len(node.Network().Conns()))
}
// EstablishedPeersCount return handShakeSucceed steam count.
// Depreciated
func (node *Node) EstablishedPeersCount() int32 {
return node.PeersCount()
}
// Connected returns connected peer ids
func (node *Node) Connected() []peer.ID {
connections := node.Network().Conns()
peers := make([]peer.ID, len(connections))
for i, n := range connections {
peers[i] = n.RemotePeer()
}
return peers
}
// NewNode return new Node according to the config.
func NewNode(cfg *medletpb.Config, recvMessageCh chan<- Message) (*Node, error) {
bCfg, err := NewBootstrapConfig(cfg)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"medletCfg": cfg,
"err": err,
}).Error("failed to make new bootstrap config")
return nil, err
}
cache := path.Join(cfg.Global.Datadir, DefaultCacheFile)
if cfg.Network.CacheFile != "" {
cache = cfg.Network.CacheFile
}
cachePeriod := DefaultCachePeriod
if cfg.Network.CachePeriod != 0 {
cachePeriod = time.Duration(cfg.Network.CachePeriod) * time.Second
}
bf := NewBloomFilter(
bloomFilterOfRecvMessageArgM,
bloomFilterOfRecvMessageArgK,
maxCountOfRecvMessageInBloomFiler,
)
return &Node{
cfg: cfg,
recvMessageCh: recvMessageCh,
dhtTicker: make(chan time.Time),
chainID: cfg.Global.ChainId,
bloomFilter: bf,
bootstrapConfig: bCfg,
cacheFile: cache,
cachePeriod: cachePeriod,
}, nil
}
func (node *Node) initHost(ctx context.Context) error {
cfg := node.cfg
// check Listen port.
if err := checkPortAvailable(cfg.Network.Listens); err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
"listen": cfg.Network.Listens,
}).Error("Listen port is not available.")
return err
}
networkKey, err := LoadOrNewNetworkKey(cfg)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to load network key")
return err
}
lw := int(cfg.Network.ConnMgrLowWaterMark)
if lw == 0 {
lw = DefaultConnMgrLowWater
}
hw := int(cfg.Network.ConnMgrHighWaterMark)
if hw == 0 {
hw = DefaultConnMgrHighWater
}
gp := time.Duration(cfg.Network.ConnMgrGracePeriod) * time.Second
if gp == 0 {
gp = DefaultConnMgrGracePeriod
}
connMgr := connmgr.NewConnManager(lw, hw, gp)
host, err := libp2p.New(ctx,
libp2p.Identity(networkKey),
libp2p.ListenAddrStrings(cfg.Network.Listens...),
libp2p.ConnectionManager(connMgr),
// TODO libp2p.BandwidthReporter(),
)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to init libp2p host")
return err
}
logging.Console().WithFields(logrus.Fields{
"id": host.ID().Pretty(),
"addrs": host.Addrs(),
}).Info("New host started")
d, err := dht.New(ctx, host, dhtopts.Protocols(MedDHTProtocolID))
if err != nil {
return err
}
node.context = ctx
node.Host = host
node.dht = d
node.messageSender = newMessageSender(ctx, host, int32(cfg.Network.MaxWriteConcurrency))
node.messageReceiver = newMessageReceiver(ctx, node.recvMessageCh, node.bloomFilter, int32(cfg.Network.MaxReadConcurrency))
return nil
}
// Start host & route table discovery
func (node *Node) Start(ctx context.Context) error {
logging.Console().Info("Starting MedService Node...")
if err := node.initHost(ctx); err != nil {
return err
}
node.SetStreamHandler(MedProtocolID, node.receiveMessage)
proc, err := node.dht.BootstrapOnSignal(dht.DefaultBootstrapConfig, node.dhtTicker)
if err != nil {
return err
}
go func() {
defer proc.Close()
select {
case <-node.context.Done():
case <-node.dht.Context().Done():
}
}()
err = node.loadPeerStoreFromCache(node.cacheFile)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Info("Failed to load peer store cache file.")
return err
}
node.messageSender.Start()
node.messageReceiver.Start()
node.Bootstrap()
node.DHTSync()
go node.loop()
logging.Console().WithFields(logrus.Fields{
"id": node.ID(),
"listening address": node.Addrs(),
}).Info("Started MedService Node.")
return nil
}
func (node *Node) loop() {
cacheTicker := time.NewTicker(node.cachePeriod)
defer cacheTicker.Stop()
bootstrapTicker := time.NewTicker(node.bootstrapConfig.Period)
defer bootstrapTicker.Stop()
dhtTicker := time.NewTicker(dht.DefaultBootstrapConfig.Period)
defer dhtTicker.Stop()
for {
// route table sync ticker
select {
case <-node.context.Done():
logging.Console().WithFields(logrus.Fields{
"id": node.ID(),
"listening address": node.Addrs(),
}).Info("Stopping MedService Node...")
node.Close()
return
case <-cacheTicker.C:
node.SaveCache()
case <-bootstrapTicker.C:
node.Bootstrap()
case <-dhtTicker.C:
node.DHTSync()
}
}
}
// DHTSync run dht bootstrap
func (node *Node) DHTSync() {
node.dhtTicker <- time.Now()
}
func (node *Node) receiveMessage(s inet.Stream) {
node.messageReceiver.streamCh <- s
}
func (node *Node) sendMessage(msg *SendMessage) {
node.messageSender.msgCh <- msg
}
// SendMessageToPeer send message to a peer.
func (node *Node) SendMessageToPeer(msgType string, data []byte, priority int, peerID string) {
id, err := peer.IDB58Decode(peerID)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
"peerID": peerID,
"msgType": msgType,
}).Error("invalid peer id")
return // ignore
}
msg, err := newSendMessage(node.chainID, msgType, data, priority, id)
if err != nil {
logging.Console().Debug("failed to make new sendMessage")
return
}
node.sendMessage(msg)
}
// SendMessageToPeers send messages to filtered peers
func (node *Node) SendMessageToPeers(msgType string, data []byte, priority int, filter PeerFilterAlgorithm) (peers []string) {
tempMsg, err := newSendMessage(node.chainID, msgType, data, priority, "")
if err != nil {
logging.Console().Debug("failed to make new sendMessage")
return nil
}
receivers := filter.Filter(node.Connected())
for _, p := range receivers {
msg := tempMsg.copy()
msg.SetReceiver(p)
node.sendMessage(msg)
}
ids := make([]string, len(receivers))
for i, p := range receivers {
ids[i] = p.Pretty()
}
return ids
}
// BroadcastMessage broadcast message.
func (node *Node) BroadcastMessage(msgType string, data []byte, priority int) {
tempMsg, err := newSendMessage(node.chainID, msgType, data, priority, "")
if err != nil {
logging.Console().Debug("failed to make new sendMessage")
return
}
receivers := node.Connected() // TODO: minimize broadcast target @drsleepytiger
for _, p := range receivers {
msg := tempMsg.copy()
msg.SetReceiver(p)
if node.bloomFilter.HasRecvMessage(msg) {
logging.Console().WithFields(logrus.Fields{
"hash": msg.Hash(),
"peerID": msg.receiver.Pretty(),
"msgType": msg.MessageType(),
}).Debug("avoid duplicate message broadcast")
continue
}
node.sendMessage(msg)
}
}
// ClosePeer close the connection to peer
func (node *Node) ClosePeer(peerID string, reason error) {
id, err := peer.IDB58Decode(peerID)
if err != nil {
return // ignore
}
for _, c := range node.Network().ConnsToPeer(id) {
c.Close()
}
}
func (node *Node) addPeer(pi peerstore.PeerInfo, ttl time.Duration) {
node.Peerstore().AddAddrs(pi.ID, pi.Addrs, ttl)
go func() {
ctx, cancel := context.WithTimeout(node.context, 1*time.Second)
defer cancel()
pings, err := ping.Ping(ctx, node, pi.ID)
if err != nil {
node.Peerstore().ClearAddrs(pi.ID)
return
}
_, ok := <-pings
if !ok {
node.Peerstore().ClearAddrs(pi.ID)
return
}
node.dht.Update(node.context, pi.ID)
}()
}
func (node *Node) addPeersFromProto(peers *netpb.Peers) error {
for _, p := range peers.Peers {
pid, err := peer.IDB58Decode(p.Id)
if err != nil {
logging.WithFields(logrus.Fields{
"pid": p.Id,
"err": err,
}).Warn("failed to decode pid")
return err
}
addrs := make([]multiaddr.Multiaddr, len(p.Addrs))
for i, addr := range p.Addrs {
addrs[i], err = multiaddr.NewMultiaddr(addr)
if err != nil {
logging.WithFields(logrus.Fields{
"add": p.Id,
"err": err,
}).Warn("failed to convert multiaddr")
return err
}
}
node.addPeer(peerstore.PeerInfo{ID: pid, Addrs: addrs}, peerstore.PermanentAddrTTL)
}
return nil
}
// loadPeerStoreFromCache load peerstore from cache file
func (node *Node) loadPeerStoreFromCache(cacheFile string) error {
_, err := os.Stat(cacheFile)
if os.IsNotExist(err) {
return nil
} else if err != nil {
return err
}
b, err := ioutil.ReadFile(cacheFile)
if err != nil {
return err
}
str := string(b)
peers := new(netpb.Peers)
if err := proto.UnmarshalText(str, peers); err != nil {
logging.WithFields(logrus.Fields{
"err": err,
}).Warn("failed to unmarshal peers from cache file")
return err
}
return node.addPeersFromProto(peers)
}