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messenger_mailserver_cycle.go
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messenger_mailserver_cycle.go
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package protocol
import (
"context"
"crypto/rand"
"math"
"math/big"
"sort"
"strings"
"sync"
"time"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/multiformats/go-multiaddr"
"github.com/pkg/errors"
"go.uber.org/zap"
"github.com/status-im/go-waku/waku/v2/dnsdisc"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/status-im/status-go/params"
"github.com/status-im/status-go/services/mailservers"
"github.com/status-im/status-go/signal"
)
const defaultBackoff = 30 * time.Second
type byRTTMs []*mailservers.PingResult
func (s byRTTMs) Len() int {
return len(s)
}
func (s byRTTMs) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s byRTTMs) Less(i, j int) bool {
return *s[i].RTTMs < *s[j].RTTMs
}
func (m *Messenger) StartMailserverCycle() error {
canUseMailservers, err := m.settings.CanUseMailservers()
if err != nil {
return err
}
if !canUseMailservers {
return errors.New("mailserver use is not allowed")
}
m.logger.Debug("started mailserver cycle")
m.mailserverCycle.events = make(chan *p2p.PeerEvent, 20)
m.mailserverCycle.subscription = m.server.SubscribeEvents(m.mailserverCycle.events)
go m.checkMailserverConnection()
go m.updateWakuV1PeerStatus()
go m.updateWakuV2PeerStatus()
return nil
}
func (m *Messenger) DisconnectActiveMailserver() {
m.mailserverCycle.Lock()
defer m.mailserverCycle.Unlock()
m.disconnectActiveMailserver()
}
func (m *Messenger) disconnectV1Mailserver() {
// TODO: remove this function once WakuV1 is deprecated
if m.mailserverCycle.activeMailserver == nil {
return
}
m.logger.Info("Disconnecting active mailserver", zap.Any("nodeID", m.mailserverCycle.activeMailserver.ID()))
pInfo, ok := m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID().String()]
if ok {
pInfo.status = disconnected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID().String()] = pInfo
} else {
m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID().String()] = peerStatus{
status: disconnected,
canConnectAfter: time.Now().Add(defaultBackoff),
}
}
m.server.RemovePeer(m.mailserverCycle.activeMailserver)
m.mailserverCycle.activeMailserver = nil
}
func (m *Messenger) disconnectStoreNode() {
if m.mailserverCycle.activeStoreNode == nil {
return
}
m.logger.Info("Disconnecting active storeNode", zap.Any("nodeID", m.mailserverCycle.activeStoreNode.Pretty()))
pInfo, ok := m.mailserverCycle.peers[string(*m.mailserverCycle.activeStoreNode)]
if ok {
pInfo.status = disconnected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
m.mailserverCycle.peers[string(*m.mailserverCycle.activeStoreNode)] = pInfo
} else {
m.mailserverCycle.peers[string(*m.mailserverCycle.activeStoreNode)] = peerStatus{
status: disconnected,
canConnectAfter: time.Now().Add(defaultBackoff),
}
}
err := m.transport.DropPeer(string(*m.mailserverCycle.activeStoreNode))
if err != nil {
m.logger.Warn("Could not drop peer")
}
m.mailserverCycle.activeStoreNode = nil
}
func (m *Messenger) disconnectActiveMailserver() {
switch m.transport.WakuVersion() {
case 1:
m.disconnectV1Mailserver()
case 2:
m.disconnectStoreNode()
}
signal.SendMailserverChanged("")
}
func (m *Messenger) cycleMailservers() {
m.mailserverCycle.Lock()
defer m.mailserverCycle.Unlock()
m.logger.Info("Automatically switching mailserver")
if m.mailserverCycle.activeMailserver != nil {
m.disconnectActiveMailserver()
}
err := m.findNewMailserver()
if err != nil {
m.logger.Error("Error getting new mailserver", zap.Error(err))
}
}
func poolSize(fleetSize int) int {
return int(math.Ceil(float64(fleetSize) / 4))
}
func (m *Messenger) findNewMailserver() error {
switch m.transport.WakuVersion() {
case 1:
return m.findNewMailserverV1()
case 2:
return m.findStoreNode()
default:
return errors.New("waku version is not supported")
}
}
func (m *Messenger) findStoreNode() error {
allMailservers := parseStoreNodeConfig(m.config.clusterConfig.StoreNodes)
// TODO: append user mailservers once that functionality is available for waku2
var mailserverList []multiaddr.Multiaddr
now := time.Now()
for _, node := range allMailservers {
pID, err := getPeerID(node)
if err != nil {
continue
}
pInfo, ok := m.mailserverCycle.peers[string(pID)]
if !ok || pInfo.canConnectAfter.Before(now) {
mailserverList = append(mailserverList, node)
}
}
m.logger.Info("Finding a new store node...")
var mailserverStr []string
for _, m := range mailserverList {
mailserverStr = append(mailserverStr, m.String())
}
pingResult, err := mailservers.DoPing(context.Background(), mailserverStr, 500, mailservers.MultiAddressToAddress)
if err != nil {
return err
}
var availableMailservers []*mailservers.PingResult
for _, result := range pingResult {
if result.Err != nil {
continue // The results with error are ignored
}
availableMailservers = append(availableMailservers, result)
}
sort.Sort(byRTTMs(availableMailservers))
if len(availableMailservers) == 0 {
m.logger.Warn("No store nodes available") // Do nothing...
return nil
}
// Picks a random mailserver amongs the ones with the lowest latency
// The pool size is 1/4 of the mailservers were pinged successfully
pSize := poolSize(len(availableMailservers) - 1)
if pSize <= 0 {
m.logger.Warn("No store nodes available") // Do nothing...
return nil
}
r, err := rand.Int(rand.Reader, big.NewInt(int64(pSize)))
if err != nil {
return err
}
return m.connectToStoreNode(parseMultiaddresses([]string{availableMailservers[r.Int64()].Address})[0])
}
func (m *Messenger) getFleet() (string, error) {
var fleet string
dbFleet, err := m.settings.GetFleet()
if err != nil {
return "", err
}
if dbFleet != "" {
fleet = dbFleet
} else if m.config.clusterConfig.Fleet != "" {
fleet = m.config.clusterConfig.Fleet
} else {
fleet = params.FleetProd
}
return fleet, nil
}
func (m *Messenger) findNewMailserverV1() error {
// TODO: remove this function once WakuV1 is deprecated
allMailservers := parseNodes(m.config.clusterConfig.TrustedMailServers)
// Append user mailservers
fleet, err := m.getFleet()
if err != nil {
return err
}
customMailservers, err := m.mailservers.Mailservers()
if err != nil {
return err
}
for _, c := range customMailservers {
if c.Fleet == fleet {
mNode, err := enode.ParseV4(c.Address)
if err != nil {
allMailservers = append(allMailservers, mNode)
}
}
}
var mailserverList []*enode.Node
now := time.Now()
for _, node := range allMailservers {
pInfo, ok := m.mailserverCycle.peers[node.ID().String()]
if !ok || pInfo.canConnectAfter.Before(now) {
mailserverList = append(mailserverList, node)
}
}
m.logger.Info("Finding a new mailserver...")
var mailserverStr []string
for _, m := range mailserverList {
mailserverStr = append(mailserverStr, m.String())
}
pingResult, err := mailservers.DoPing(context.Background(), mailserverStr, 500, mailservers.EnodeStringToAddr)
if err != nil {
return err
}
var availableMailservers []*mailservers.PingResult
for _, result := range pingResult {
if result.Err != nil {
continue // The results with error are ignored
}
availableMailservers = append(availableMailservers, result)
}
sort.Sort(byRTTMs(availableMailservers))
if len(availableMailservers) == 0 {
m.logger.Warn("No mailservers available") // Do nothing...
return nil
}
// Picks a random mailserver amongs the ones with the lowest latency
// The pool size is 1/4 of the mailservers were pinged successfully
pSize := poolSize(len(availableMailservers) - 1)
if pSize <= 0 {
m.logger.Warn("No store nodes available") // Do nothing...
return nil
}
r, err := rand.Int(rand.Reader, big.NewInt(int64(pSize)))
if err != nil {
return err
}
return m.connectToMailserver(parseNodes([]string{availableMailservers[r.Int64()].Address})[0])
}
func (m *Messenger) activeMailserverStatus() (connStatus, error) {
var mailserverID string
switch m.transport.WakuVersion() {
case 1:
if m.mailserverCycle.activeMailserver == nil {
return disconnected, errors.New("Active mailserver is not set")
}
mailserverID = m.mailserverCycle.activeMailserver.ID().String()
case 2:
if m.mailserverCycle.activeStoreNode == nil {
return disconnected, errors.New("Active storenode is not set")
}
mailserverID = string(*m.mailserverCycle.activeStoreNode)
default:
return disconnected, errors.New("waku version is not supported")
}
return m.mailserverCycle.peers[mailserverID].status, nil
}
func (m *Messenger) connectToMailserver(node *enode.Node) error {
// TODO: remove this function once WakuV1 is deprecated
if m.transport.WakuVersion() != 1 {
return nil // This can only be used with wakuV1
}
m.logger.Info("Connecting to mailserver", zap.Any("peer", node.ID()))
nodeConnected := false
m.mailserverCycle.activeMailserver = node
signal.SendMailserverChanged(m.mailserverCycle.activeMailserver.String())
// Adding a peer and marking it as connected can't be executed sync in WakuV1, because
// There's a delay between requesting a peer being added, and a signal being
// received after the peer was added. So we first set the peer status as
// Connecting and once a peerConnected signal is received, we mark it as
// Connected
activeMailserverStatus, err := m.activeMailserverStatus()
if err != nil {
return err
}
if activeMailserverStatus == connected {
nodeConnected = true
} else {
// Attempt to connect to mailserver by adding it as a peer
m.SetMailserver(node.ID().Bytes())
m.server.AddPeer(node)
if err := m.peerStore.Update([]*enode.Node{node}); err != nil {
return err
}
pInfo, ok := m.mailserverCycle.peers[node.ID().String()]
if ok {
pInfo.status = connecting
pInfo.lastConnectionAttempt = time.Now()
m.mailserverCycle.peers[node.ID().String()] = pInfo
} else {
m.mailserverCycle.peers[node.ID().String()] = peerStatus{
status: connecting,
lastConnectionAttempt: time.Now(),
}
}
}
if nodeConnected {
m.logger.Info("Mailserver available")
signal.SendMailserverAvailable(m.mailserverCycle.activeMailserver.String())
}
return nil
}
func (m *Messenger) connectToStoreNode(node multiaddr.Multiaddr) error {
if m.transport.WakuVersion() != 2 {
return nil // This can only be used with wakuV2
}
m.logger.Info("Connecting to storenode", zap.Any("peer", node))
nodeConnected := false
peerID, err := getPeerID(node)
if err != nil {
return err
}
m.mailserverCycle.activeStoreNode = &peerID
signal.SendMailserverChanged(m.mailserverCycle.activeStoreNode.Pretty())
// Adding a peer and marking it as connected can't be executed sync in WakuV1, because
// There's a delay between requesting a peer being added, and a signal being
// received after the peer was added. So we first set the peer status as
// Connecting and once a peerConnected signal is received, we mark it as
// Connected
activeMailserverStatus, err := m.activeMailserverStatus()
if err != nil {
return err
}
if activeMailserverStatus == connected {
nodeConnected = true
} else {
// Attempt to connect to mailserver by adding it as a peer
m.SetMailserver([]byte(peerID.Pretty()))
if err := m.transport.DialPeer(node.String()); err != nil {
return err
}
pInfo, ok := m.mailserverCycle.peers[string(peerID)]
if ok {
pInfo.status = connected
pInfo.lastConnectionAttempt = time.Now()
} else {
m.mailserverCycle.peers[string(peerID)] = peerStatus{
status: connected,
lastConnectionAttempt: time.Now(),
}
}
nodeConnected = true
}
if nodeConnected {
m.logger.Info("Storenode available")
signal.SendMailserverAvailable(m.mailserverCycle.activeStoreNode.Pretty())
}
return nil
}
func (m *Messenger) getActiveMailserver() *enode.Node {
m.mailserverCycle.RLock()
defer m.mailserverCycle.RUnlock()
return m.mailserverCycle.activeMailserver
}
func (m *Messenger) isActiveMailserverAvailable() bool {
m.mailserverCycle.RLock()
defer m.mailserverCycle.RUnlock()
mailserverStatus, err := m.activeMailserverStatus()
if err != nil {
return false
}
return mailserverStatus == connected
}
func (m *Messenger) updateWakuV2PeerStatus() {
if m.transport.WakuVersion() != 2 {
return // This can only be used with wakuV2
}
connSubscription, err := m.transport.SubscribeToConnStatusChanges()
if err != nil {
m.logger.Error("Could not subscribe to connection status changes", zap.Error(err))
}
for {
select {
case status := <-connSubscription.C:
m.mailserverCycle.Lock()
for pID, pInfo := range m.mailserverCycle.peers {
if pInfo.status == disconnected {
continue
}
// Removing disconnected
found := false
for connectedPeer := range status.Peers {
peerID, err := peer.Decode(connectedPeer)
if err != nil {
continue
}
if string(peerID) == pID {
found = true
break
}
}
if !found && pInfo.status == connected {
m.logger.Info("Peer disconnected", zap.String("peer", peer.ID(pID).Pretty()))
pInfo.status = disconnected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
}
m.mailserverCycle.peers[pID] = pInfo
}
for connectedPeer := range status.Peers {
peerID, err := peer.Decode(connectedPeer)
if err != nil {
continue
}
pInfo, ok := m.mailserverCycle.peers[string(peerID)]
if !ok || pInfo.status != connected {
m.logger.Info("Peer connected", zap.String("peer", connectedPeer))
pInfo.status = connected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
m.mailserverCycle.peers[string(peerID)] = pInfo
}
}
m.mailserverCycle.Unlock()
case <-m.quit:
connSubscription.Unsubscribe()
return
}
}
}
func (m *Messenger) updateWakuV1PeerStatus() {
// TODO: remove this function once WakuV1 is deprecated
if m.transport.WakuVersion() != 1 {
return // This can only be used with wakuV1
}
for {
select {
case <-m.mailserverCycle.events:
connectedPeers := m.server.PeersInfo()
m.mailserverCycle.Lock()
for pID, pInfo := range m.mailserverCycle.peers {
if pInfo.status == disconnected {
continue
}
// Removing disconnected
found := false
for _, connectedPeer := range connectedPeers {
if enode.HexID(connectedPeer.ID) == enode.HexID(pID) {
found = true
break
}
}
if !found && (pInfo.status == connected || (pInfo.status == connecting && pInfo.lastConnectionAttempt.Add(8*time.Second).Before(time.Now()))) {
m.logger.Info("Peer disconnected", zap.String("peer", enode.HexID(pID).String()))
pInfo.status = disconnected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
}
m.mailserverCycle.peers[pID] = pInfo
}
for _, connectedPeer := range connectedPeers {
hexID := enode.HexID(connectedPeer.ID).String()
pInfo, ok := m.mailserverCycle.peers[hexID]
if !ok || pInfo.status != connected {
m.logger.Info("Peer connected", zap.String("peer", hexID))
pInfo.status = connected
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
if m.mailserverCycle.activeMailserver != nil && hexID == m.mailserverCycle.activeMailserver.ID().String() {
m.logger.Info("Mailserver available")
signal.SendMailserverAvailable(m.mailserverCycle.activeMailserver.String())
}
m.mailserverCycle.peers[hexID] = pInfo
}
}
m.mailserverCycle.Unlock()
case <-m.quit:
m.mailserverCycle.Lock()
defer m.mailserverCycle.Unlock()
close(m.mailserverCycle.events)
m.mailserverCycle.subscription.Unsubscribe()
return
}
}
}
func (m *Messenger) getPinnedMailserver() (string, error) {
// TODO: Pinned mailservers are ony available in V1 for now
if m.transport.WakuVersion() != 1 {
return "", nil
}
fleet, err := m.getFleet()
if err != nil {
return "", err
}
pinnedMailservers, err := m.settings.GetPinnedMailservers()
if err != nil {
return "", err
}
pinnedMailserver, ok := pinnedMailservers[fleet]
if !ok {
return "", nil
}
return pinnedMailserver, nil
}
func (m *Messenger) checkMailserverConnection() {
ticker := time.NewTicker(10 * time.Second)
defer ticker.Stop()
for {
m.logger.Info("Verifying mailserver connection state...")
pinnedMailserver, err := m.getPinnedMailserver()
if err != nil {
m.logger.Error("Could not obtain the pinned mailserver", zap.Error(err))
continue
}
if pinnedMailserver != "" {
pinnedNode := parseNodes([]string{pinnedMailserver})[0]
activeMailserver := m.getActiveMailserver()
if activeMailserver == nil || activeMailserver.String() != pinnedMailserver {
m.logger.Info("New pinned mailserver", zap.Any("pinnedMailserver", pinnedMailserver))
err = m.connectToMailserver(pinnedNode)
if err != nil {
m.logger.Error("Could not connect to pinned mailserver", zap.Error(err))
continue
}
}
} else {
// or setup a random mailserver:
if !m.isActiveMailserverAvailable() {
m.cycleMailservers()
}
}
select {
case <-m.quit:
return
case <-ticker.C:
continue
}
}
}
func parseNodes(enodes []string) []*enode.Node {
var nodes []*enode.Node
for _, item := range enodes {
parsedPeer, err := enode.ParseV4(item)
if err == nil {
nodes = append(nodes, parsedPeer)
}
}
return nodes
}
func parseMultiaddresses(addresses []string) []multiaddr.Multiaddr {
var result []multiaddr.Multiaddr
for _, item := range addresses {
ma, err := multiaddr.NewMultiaddr(item)
if err == nil {
result = append(result, ma)
}
}
return result
}
func parseStoreNodeConfig(addresses []string) []multiaddr.Multiaddr {
// TODO: once a scoring/reputation mechanism is added to waku,
// this function can be modified to retrieve the storenodes
// from waku peerstore.
// We don't do that now because we can't trust any random storenode
// So we use only those specified in the cluster config
var result []multiaddr.Multiaddr
var dnsDiscWg sync.WaitGroup
maChan := make(chan multiaddr.Multiaddr, 1000)
for _, addrString := range addresses {
if strings.HasPrefix(addrString, "enrtree://") {
// Use DNS Discovery
dnsDiscWg.Add(1)
go func(addr string) {
defer dnsDiscWg.Done()
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
multiaddresses, err := dnsdisc.RetrieveNodes(ctx, addr)
if err == nil {
for _, ma := range multiaddresses {
maChan <- ma
}
}
}(addrString)
} else {
// It's a normal multiaddress
ma, err := multiaddr.NewMultiaddr(addrString)
if err == nil {
maChan <- ma
}
}
}
dnsDiscWg.Wait()
close(maChan)
for ma := range maChan {
result = append(result, ma)
}
return result
}
func getPeerID(addr multiaddr.Multiaddr) (peer.ID, error) {
idStr, err := addr.ValueForProtocol(multiaddr.P_P2P)
if err != nil {
return "", err
}
return peer.Decode(idStr)
}