/
peer_handler.go
166 lines (138 loc) · 4.78 KB
/
peer_handler.go
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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package backend
import (
"github.com/mapprotocol/atlas/p2p"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/mapprotocol/atlas/consensus/istanbul"
)
type validatorPeerHandler struct {
sb *Backend
threadRunning bool
threadRunningMu sync.RWMutex
threadWg *sync.WaitGroup
threadQuit chan struct{}
}
func newVPH(sb *Backend) *validatorPeerHandler {
return &validatorPeerHandler{
sb: sb,
threadWg: new(sync.WaitGroup),
threadQuit: make(chan struct{}),
}
}
func (vph *validatorPeerHandler) startThread() error {
vph.threadRunningMu.Lock()
defer vph.threadRunningMu.Unlock()
if vph.threadRunning {
return istanbul.ErrStartedVPHThread
}
vph.threadRunning = true
go vph.thread()
return nil
}
func (vph *validatorPeerHandler) stopThread() error {
vph.threadRunningMu.Lock()
defer vph.threadRunningMu.Unlock()
if !vph.threadRunning {
return istanbul.ErrStoppedVPHThread
}
vph.threadQuit <- struct{}{}
vph.threadWg.Wait()
vph.threadRunning = false
return nil
}
func (vph *validatorPeerHandler) thread() {
vph.threadWg.Add(1)
defer vph.threadWg.Done()
refreshValidatorPeersTicker := time.NewTicker(1 * time.Minute)
refreshValPeersFunc := func() {
if vph.MaintainValConnections() {
if err := vph.sb.RefreshValPeers(); err != nil {
vph.sb.logger.Warn("Error refreshing validator peers", "err", err)
}
}
}
refreshValPeersFunc()
// Every 5 minute, check to see if we need to refresh the validator peers
for {
select {
case <-refreshValidatorPeersTicker.C:
refreshValPeersFunc()
case <-vph.threadQuit:
refreshValidatorPeersTicker.Stop()
return
}
}
}
// Returns whether this node should maintain validator connections
// Only proxies and non proxied validators need to connect maintain validator connections
func (vph *validatorPeerHandler) MaintainValConnections() bool {
return vph.sb.IsProxy() || (vph.sb.IsValidator() && !vph.sb.IsProxiedValidator())
}
func (vph *validatorPeerHandler) AddValidatorPeer(node *enode.Node, address common.Address) {
if !vph.MaintainValConnections() {
return
}
// Connect to the remote peer if it's part of the current epoch's valset and
// if this node is also part of the current epoch's valset
valConnSet, err := vph.sb.RetrieveValidatorConnSet()
if err != nil {
vph.sb.logger.Error("Error in retrieving val conn set in AddValidatorPeer", "err", err)
return
}
if valConnSet[address] && valConnSet[vph.sb.ValidatorAddress()] {
vph.sb.p2pserver.AddPeer(node, p2p.ValidatorPurpose)
vph.sb.p2pserver.AddTrustedPeer(node, p2p.ValidatorPurpose)
}
}
func (vph *validatorPeerHandler) RemoveValidatorPeer(node *enode.Node) {
vph.sb.p2pserver.RemovePeer(node, p2p.ValidatorPurpose)
vph.sb.p2pserver.RemoveTrustedPeer(node, p2p.ValidatorPurpose)
}
func (vph *validatorPeerHandler) ReplaceValidatorPeers(newNodes []*enode.Node) {
nodeIDSet := make(map[enode.ID]bool)
for _, node := range newNodes {
nodeIDSet[node.ID()] = true
}
// Remove old Validator Peers
for existingPeerID, existingPeer := range vph.sb.broadcaster.FindPeers(nil, p2p.ValidatorPurpose) {
if !nodeIDSet[existingPeerID] {
vph.RemoveValidatorPeer(existingPeer.Node())
}
}
if vph.MaintainValConnections() {
// Add new Validator Peers (adds all the nodes in newNodes. Note that add is noOp on already existent ones)
for _, newNode := range newNodes {
vph.sb.p2pserver.AddPeer(newNode, p2p.ValidatorPurpose)
vph.sb.p2pserver.AddTrustedPeer(newNode, p2p.ValidatorPurpose)
}
}
}
func (vph *validatorPeerHandler) ClearValidatorPeers() {
for _, peer := range vph.sb.broadcaster.FindPeers(nil, p2p.ValidatorPurpose) {
vph.sb.p2pserver.RemovePeer(peer.Node(), p2p.ValidatorPurpose)
vph.sb.p2pserver.RemoveTrustedPeer(peer.Node(), p2p.ValidatorPurpose)
}
}
func (sb *Backend) AddPeer(node *enode.Node, purpose p2p.PurposeFlag) {
sb.p2pserver.AddPeer(node, purpose)
}
func (sb *Backend) RemovePeer(node *enode.Node, purpose p2p.PurposeFlag) {
sb.p2pserver.RemovePeer(node, purpose)
}