142 lines
3.0 KiB
Go
142 lines
3.0 KiB
Go
package peermgr
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import (
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"context"
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"sync"
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"time"
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"github.com/filecoin-project/lotus/node/modules/dtypes"
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host "github.com/libp2p/go-libp2p-core/host"
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net "github.com/libp2p/go-libp2p-core/network"
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peer "github.com/libp2p/go-libp2p-core/peer"
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dht "github.com/libp2p/go-libp2p-kad-dht"
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logging "github.com/ipfs/go-log"
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)
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var log = logging.Logger("peermgr")
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const (
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MaxFilPeers = 32
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MinFilPeers = 8
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)
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type PeerMgr struct {
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bootstrappers []peer.AddrInfo
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// peerLeads is a set of peers we hear about through the network
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// and who may be good peers to connect to for expanding our peer set
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//peerLeads map[peer.ID]time.Time // TODO: unused
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peersLk sync.Mutex
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peers map[peer.ID]struct{}
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maxFilPeers int
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minFilPeers int
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expanding bool
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h host.Host
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dht *dht.IpfsDHT
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notifee *net.NotifyBundle
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}
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func NewPeerMgr(h host.Host, dht *dht.IpfsDHT, bootstrap dtypes.BootstrapPeers) *PeerMgr {
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pm := &PeerMgr{
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h: h,
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dht: dht,
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bootstrappers: bootstrap,
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peers: make(map[peer.ID]struct{}),
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maxFilPeers: MaxFilPeers,
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minFilPeers: MinFilPeers,
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}
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pm.notifee = &net.NotifyBundle{
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DisconnectedF: func(_ net.Network, c net.Conn) {
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pm.Disconnect(c.RemotePeer())
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},
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}
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h.Network().Notify(pm.notifee)
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return pm
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}
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func (pmgr *PeerMgr) AddFilecoinPeer(p peer.ID) {
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pmgr.peersLk.Lock()
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defer pmgr.peersLk.Unlock()
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pmgr.peers[p] = struct{}{}
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}
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func (pmgr *PeerMgr) Disconnect(p peer.ID) {
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if pmgr.h.Network().Connectedness(p) == net.NotConnected {
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pmgr.peersLk.Lock()
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defer pmgr.peersLk.Unlock()
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delete(pmgr.peers, p)
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}
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}
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func (pmgr *PeerMgr) Run(ctx context.Context) {
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tick := time.NewTicker(time.Second * 5)
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for {
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select {
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case <-tick.C:
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pcount := pmgr.getPeerCount()
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if pcount < pmgr.minFilPeers {
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pmgr.expandPeers()
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} else if pcount > pmgr.maxFilPeers {
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log.Debug("peer count about threshold: %d > %d", pcount, pmgr.maxFilPeers)
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}
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}
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}
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}
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func (pmgr *PeerMgr) getPeerCount() int {
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pmgr.peersLk.Lock()
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defer pmgr.peersLk.Unlock()
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return len(pmgr.peers)
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}
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func (pmgr *PeerMgr) expandPeers() {
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if pmgr.expanding {
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return
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}
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pmgr.expanding = true
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go func() {
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defer func() {
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pmgr.expanding = false
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}()
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ctx, cancel := context.WithTimeout(context.TODO(), time.Second*30)
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defer cancel()
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pmgr.doExpand(ctx)
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}()
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}
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func (pmgr *PeerMgr) doExpand(ctx context.Context) {
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pcount := pmgr.getPeerCount()
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if pcount == 0 {
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if len(pmgr.bootstrappers) == 0 {
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log.Warn("no peers connected, and no bootstrappers configured")
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return
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}
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log.Info("connecting to bootstrap peers")
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for _, bsp := range pmgr.bootstrappers {
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if err := pmgr.h.Connect(ctx, bsp); err != nil {
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log.Warnf("failed to connect to bootstrap peer: %s", err)
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}
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}
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return
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}
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// if we already have some peers and need more, the dht is really good at connecting to most peers. Use that for now until something better comes along.
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if err := pmgr.dht.Bootstrap(ctx); err != nil {
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log.Warnf("dht bootstrapping failed: %s", err)
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}
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}
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