791 lines
21 KiB
Go
791 lines
21 KiB
Go
package protocol
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import (
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"context"
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"crypto/rand"
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"fmt"
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"math"
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"math/big"
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"runtime"
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"sort"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"go.uber.org/zap"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/status-im/status-go/params"
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"github.com/status-im/status-go/services/mailservers"
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"github.com/status-im/status-go/signal"
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)
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const defaultBackoff = 10 * time.Second
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const graylistBackoff = 3 * time.Minute
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const isAndroidEmulator = runtime.GOOS == "android" && runtime.GOARCH == "amd64"
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const findNearestMailServer = !isAndroidEmulator
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func (m *Messenger) mailserversByFleet(fleet string) []mailservers.Mailserver {
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var items []mailservers.Mailserver
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for _, ms := range mailservers.DefaultMailservers() {
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if ms.Fleet == fleet {
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items = append(items, ms)
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}
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}
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return items
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}
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type byRTTMsAndCanConnectBefore []SortedMailserver
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func (s byRTTMsAndCanConnectBefore) Len() int {
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return len(s)
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}
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func (s byRTTMsAndCanConnectBefore) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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func (s byRTTMsAndCanConnectBefore) Less(i, j int) bool {
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// Slightly inaccurate as time sensitive sorting, but it does not matter so much
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now := time.Now()
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if s[i].CanConnectAfter.Before(now) && s[j].CanConnectAfter.Before(now) {
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return s[i].RTTMs < s[j].RTTMs
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}
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return s[i].CanConnectAfter.Before(s[j].CanConnectAfter)
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}
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func (m *Messenger) activeMailserverID() ([]byte, error) {
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if m.mailserverCycle.activeMailserver == nil {
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return nil, nil
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}
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return m.mailserverCycle.activeMailserver.IDBytes()
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}
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func (m *Messenger) StartMailserverCycle(mailservers []mailservers.Mailserver) error {
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m.mailserverCycle.allMailservers = mailservers
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version := m.transport.WakuVersion()
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switch version {
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case 1:
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if m.server == nil {
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m.logger.Warn("not starting mailserver cycle: no p2p server is set")
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return nil
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}
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m.mailserverCycle.events = make(chan *p2p.PeerEvent, 20)
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m.mailserverCycle.subscription = m.server.SubscribeEvents(m.mailserverCycle.events)
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go m.updateWakuV1PeerStatus()
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case 2:
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if len(mailservers) == 0 {
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m.logger.Warn("not starting mailserver cycle: empty mailservers list")
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return nil
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}
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for _, storenode := range mailservers {
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_, err := m.transport.AddStorePeer(storenode.Address)
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if err != nil {
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return err
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}
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}
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go m.verifyStorenodeStatus()
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default:
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return fmt.Errorf("unsupported waku version: %d", version)
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}
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m.logger.Debug("starting mailserver cycle",
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zap.Uint("WakuVersion", m.transport.WakuVersion()),
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zap.Any("mailservers", mailservers),
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)
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return nil
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}
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func (m *Messenger) DisconnectActiveMailserver() {
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m.mailserverCycle.Lock()
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defer m.mailserverCycle.Unlock()
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m.disconnectActiveMailserver()
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}
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func (m *Messenger) disconnectMailserver() error {
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if m.mailserverCycle.activeMailserver == nil {
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m.logger.Info("no active mailserver")
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return nil
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}
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m.logger.Info("disconnecting active mailserver", zap.String("nodeID", m.mailserverCycle.activeMailserver.ID))
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m.mailPeersMutex.Lock()
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pInfo, ok := m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID]
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if ok {
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pInfo.status = disconnected
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pInfo.canConnectAfter = time.Now().Add(graylistBackoff)
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m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID] = pInfo
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} else {
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m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID] = peerStatus{
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status: disconnected,
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mailserver: *m.mailserverCycle.activeMailserver,
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canConnectAfter: time.Now().Add(graylistBackoff),
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}
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}
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m.mailPeersMutex.Unlock()
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// WakuV2 does not keep an active storenode connection
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if m.mailserverCycle.activeMailserver.Version == 1 {
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node, err := m.mailserverCycle.activeMailserver.Enode()
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if err != nil {
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return err
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}
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m.server.RemovePeer(node)
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}
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m.mailserverCycle.activeMailserver = nil
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return nil
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}
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func (m *Messenger) disconnectActiveMailserver() {
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err := m.disconnectMailserver()
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if err != nil {
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m.logger.Error("failed to disconnect mailserver", zap.Error(err))
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}
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signal.SendMailserverChanged("", "")
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}
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func (m *Messenger) cycleMailservers() {
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m.logger.Info("Automatically switching mailserver")
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if m.mailserverCycle.activeMailserver != nil {
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m.disconnectActiveMailserver()
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}
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err := m.findNewMailserver()
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if err != nil {
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m.logger.Error("Error getting new mailserver", zap.Error(err))
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}
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}
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func poolSize(fleetSize int) int {
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return int(math.Ceil(float64(fleetSize) / 4))
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}
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func (m *Messenger) getFleet() (string, error) {
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var fleet string
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dbFleet, err := m.settings.GetFleet()
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if err != nil {
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return "", err
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}
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if dbFleet != "" {
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fleet = dbFleet
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} else if m.config.clusterConfig.Fleet != "" {
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fleet = m.config.clusterConfig.Fleet
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} else {
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fleet = params.FleetProd
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}
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return fleet, nil
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}
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func (m *Messenger) allMailservers() ([]mailservers.Mailserver, error) {
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// Get configured fleet
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fleet, err := m.getFleet()
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if err != nil {
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return nil, err
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}
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// Get default mailservers for given fleet
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allMailservers := m.mailserversByFleet(fleet)
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// Add custom configured mailservers
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if m.mailserversDatabase != nil {
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customMailservers, err := m.mailserversDatabase.Mailservers()
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if err != nil {
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return nil, err
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}
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for _, c := range customMailservers {
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if c.Fleet == fleet {
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c.Version = m.transport.WakuVersion()
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allMailservers = append(allMailservers, c)
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}
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}
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}
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// Filter mailservers by configured waku version
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wakuVersion := m.transport.WakuVersion()
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matchingMailservers := make([]mailservers.Mailserver, 0, len(allMailservers))
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for _, ms := range allMailservers {
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if ms.Version == wakuVersion {
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matchingMailservers = append(matchingMailservers, ms)
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}
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}
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return matchingMailservers, nil
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}
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type SortedMailserver struct {
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Address string
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RTTMs int
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CanConnectAfter time.Time
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}
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func (m *Messenger) findNewMailserver() error {
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pinnedMailserver, err := m.getPinnedMailserver()
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if err != nil {
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m.logger.Error("Could not obtain the pinned mailserver", zap.Error(err))
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return err
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}
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if pinnedMailserver != nil {
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return m.connectToMailserver(*pinnedMailserver)
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}
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allMailservers := m.mailserverCycle.allMailservers
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// TODO: remove this check once sockets are stable on x86_64 emulators
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if findNearestMailServer {
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m.logger.Info("Finding a new mailserver...")
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var mailserverStr []string
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for _, m := range allMailservers {
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mailserverStr = append(mailserverStr, m.Address)
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}
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if len(allMailservers) == 0 {
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m.logger.Warn("no mailservers available") // Do nothing...
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return nil
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}
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var parseFn func(string) (string, error)
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if allMailservers[0].Version == 2 {
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parseFn = mailservers.MultiAddressToAddress
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} else {
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parseFn = mailservers.EnodeStringToAddr
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}
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pingResult, err := mailservers.DoPing(context.Background(), mailserverStr, 500, parseFn)
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if err != nil {
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// pinging mailservers might fail, but we don't care
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m.logger.Warn("mailservers.DoPing failed with", zap.Error(err))
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}
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var availableMailservers []*mailservers.PingResult
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for _, result := range pingResult {
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if result.Err != nil {
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m.logger.Info("connecting error", zap.String("err", *result.Err))
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continue // The results with error are ignored
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}
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availableMailservers = append(availableMailservers, result)
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}
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if len(availableMailservers) == 0 {
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m.logger.Warn("No mailservers available") // Do nothing...
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return nil
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}
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mailserversByAddress := make(map[string]mailservers.Mailserver)
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for idx := range allMailservers {
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mailserversByAddress[allMailservers[idx].Address] = allMailservers[idx]
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}
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var sortedMailservers []SortedMailserver
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for _, ping := range availableMailservers {
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address := ping.Address
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ms := mailserversByAddress[address]
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sortedMailserver := SortedMailserver{
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Address: address,
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RTTMs: *ping.RTTMs,
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}
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m.mailPeersMutex.Lock()
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pInfo, ok := m.mailserverCycle.peers[ms.ID]
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m.mailPeersMutex.Unlock()
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if ok {
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if time.Now().Before(pInfo.canConnectAfter) {
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continue // We can't connect to this node yet
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}
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}
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sortedMailservers = append(sortedMailservers, sortedMailserver)
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}
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sort.Sort(byRTTMsAndCanConnectBefore(sortedMailservers))
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// Picks a random mailserver amongs the ones with the lowest latency
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// The pool size is 1/4 of the mailservers were pinged successfully
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pSize := poolSize(len(sortedMailservers) - 1)
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if pSize <= 0 {
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pSize = len(sortedMailservers)
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if pSize <= 0 {
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m.logger.Warn("No mailservers available") // Do nothing...
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return nil
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}
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}
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r, err := rand.Int(rand.Reader, big.NewInt(int64(pSize)))
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if err != nil {
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return err
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}
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msPing := sortedMailservers[r.Int64()]
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ms := mailserversByAddress[msPing.Address]
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m.logger.Info("connecting to mailserver", zap.String("address", ms.Address))
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return m.connectToMailserver(ms)
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}
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mailserversByAddress := make(map[string]mailservers.Mailserver)
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for idx := range allMailservers {
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mailserversByAddress[allMailservers[idx].Address] = allMailservers[idx]
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}
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pSize := poolSize(len(allMailservers) - 1)
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if pSize <= 0 {
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pSize = len(allMailservers)
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if pSize <= 0 {
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m.logger.Warn("No mailservers available") // Do nothing...
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return nil
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}
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}
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r, err := rand.Int(rand.Reader, big.NewInt(int64(pSize)))
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if err != nil {
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return err
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}
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msPing := allMailservers[r.Int64()]
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ms := mailserversByAddress[msPing.Address]
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m.logger.Info("connecting to mailserver", zap.String("address", ms.Address))
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return m.connectToMailserver(ms)
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}
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func (m *Messenger) activeMailserverStatus() (connStatus, error) {
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if m.mailserverCycle.activeMailserver == nil {
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return disconnected, errors.New("Active mailserver is not set")
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}
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mailserverID := m.mailserverCycle.activeMailserver.ID
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m.mailPeersMutex.Lock()
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status := m.mailserverCycle.peers[mailserverID].status
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m.mailPeersMutex.Unlock()
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return status, nil
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}
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func (m *Messenger) connectToMailserver(ms mailservers.Mailserver) error {
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m.logger.Info("connecting to mailserver", zap.Any("peer", ms.ID))
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m.mailserverCycle.activeMailserver = &ms
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signal.SendMailserverChanged(m.mailserverCycle.activeMailserver.Address, m.mailserverCycle.activeMailserver.ID)
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// Adding a peer and marking it as connected can't be executed sync in WakuV1, because
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// There's a delay between requesting a peer being added, and a signal being
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// received after the peer was added. So we first set the peer status as
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// Connecting and once a peerConnected signal is received, we mark it as
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// Connected
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activeMailserverStatus, err := m.activeMailserverStatus()
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if err != nil {
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return err
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}
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if ms.Version != m.transport.WakuVersion() {
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return errors.New("mailserver waku version doesn't match")
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}
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if activeMailserverStatus != connected {
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// WakuV2 does not require having the peer connected to query the peer
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// Attempt to connect to mailserver by adding it as a peer
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if ms.Version == 1 {
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node, err := ms.Enode()
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if err != nil {
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return err
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}
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m.server.AddPeer(node)
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if err := m.peerStore.Update([]*enode.Node{node}); err != nil {
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return err
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}
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}
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connectionStatus := connecting
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if ms.Version == 2 {
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connectionStatus = connected
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}
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m.mailPeersMutex.Lock()
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m.mailserverCycle.peers[ms.ID] = peerStatus{
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status: connectionStatus,
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lastConnectionAttempt: time.Now(),
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canConnectAfter: time.Now().Add(defaultBackoff),
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mailserver: ms,
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}
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m.mailPeersMutex.Unlock()
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if ms.Version == 2 {
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m.mailserverCycle.activeMailserver.FailedRequests = 0
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m.logger.Info("mailserver available", zap.String("address", m.mailserverCycle.activeMailserver.UniqueID()))
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m.EmitMailserverAvailable()
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signal.SendMailserverAvailable(m.mailserverCycle.activeMailserver.Address, m.mailserverCycle.activeMailserver.ID)
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// Query mailserver
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go func() {
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_, err := m.performMailserverRequest(func() (*MessengerResponse, error) { return m.RequestAllHistoricMessages(false) })
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if err != nil {
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m.logger.Error("could not perform mailserver request", zap.Error(err))
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}
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}()
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}
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}
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return nil
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}
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func (m *Messenger) getActiveMailserver() *mailservers.Mailserver {
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return m.mailserverCycle.activeMailserver
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}
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func (m *Messenger) isActiveMailserverAvailable() bool {
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mailserverStatus, err := m.activeMailserverStatus()
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if err != nil {
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return false
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}
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return mailserverStatus == connected
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}
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func (m *Messenger) mailserverAddressToID(uniqueID string, allMailservers []mailservers.Mailserver) (string, error) {
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for _, ms := range allMailservers {
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if uniqueID == ms.UniqueID() {
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return ms.ID, nil
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}
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}
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return "", nil
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}
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type ConnectedPeer struct {
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UniqueID string
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}
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func (m *Messenger) mailserverPeersInfo() []ConnectedPeer {
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var connectedPeers []ConnectedPeer
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for _, connectedPeer := range m.server.PeersInfo() {
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connectedPeers = append(connectedPeers, ConnectedPeer{
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// This is a bit fragile, but should work
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UniqueID: strings.TrimSuffix(connectedPeer.Enode, "?discport=0"),
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})
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}
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return connectedPeers
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}
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func (m *Messenger) penalizeMailserver(id string) {
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m.mailPeersMutex.Lock()
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defer m.mailPeersMutex.Unlock()
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pInfo, ok := m.mailserverCycle.peers[id]
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if !ok {
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pInfo.status = disconnected
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}
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pInfo.canConnectAfter = time.Now().Add(graylistBackoff)
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m.mailserverCycle.peers[id] = pInfo
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}
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func (m *Messenger) handleMailserverCycleEvent(connectedPeers []ConnectedPeer) error {
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m.logger.Debug("mailserver cycle event",
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zap.Any("connected", connectedPeers),
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zap.Any("peer-info", m.mailserverCycle.peers))
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m.mailPeersMutex.Lock()
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for pID, pInfo := range m.mailserverCycle.peers {
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if pInfo.status == disconnected {
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continue
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}
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// Removing disconnected
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found := false
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for _, connectedPeer := range connectedPeers {
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id, err := m.mailserverAddressToID(connectedPeer.UniqueID, m.mailserverCycle.allMailservers)
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if err != nil {
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m.logger.Error("failed to convert id to hex", zap.Error(err))
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return err
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}
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if pID == id {
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found = true
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break
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}
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}
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if !found && (pInfo.status == connected || (pInfo.status == connecting && pInfo.lastConnectionAttempt.Add(8*time.Second).Before(time.Now()))) {
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m.logger.Info("peer disconnected", zap.String("peer", pID))
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pInfo.status = disconnected
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pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
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}
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m.mailserverCycle.peers[pID] = pInfo
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}
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m.mailPeersMutex.Unlock()
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|
|
// Only evaluate connected peers once a mailserver has been set
|
|
// otherwise, we would attempt to retrieve history and end up with a mailserver
|
|
// not available error
|
|
if m.mailserverCycle.activeMailserver != nil {
|
|
for _, connectedPeer := range connectedPeers {
|
|
id, err := m.mailserverAddressToID(connectedPeer.UniqueID, m.mailserverCycle.allMailservers)
|
|
if err != nil {
|
|
m.logger.Error("failed to convert id to hex", zap.Error(err))
|
|
return err
|
|
}
|
|
if id == "" {
|
|
continue
|
|
}
|
|
|
|
m.mailPeersMutex.Lock()
|
|
pInfo, ok := m.mailserverCycle.peers[id]
|
|
if !ok || pInfo.status != connected {
|
|
m.logger.Info("peer connected", zap.String("peer", connectedPeer.UniqueID))
|
|
pInfo.status = connected
|
|
if pInfo.canConnectAfter.Before(time.Now()) {
|
|
pInfo.canConnectAfter = time.Now().Add(defaultBackoff)
|
|
}
|
|
m.mailserverCycle.peers[id] = pInfo
|
|
m.mailPeersMutex.Unlock()
|
|
|
|
if id == m.mailserverCycle.activeMailserver.ID {
|
|
m.mailserverCycle.activeMailserver.FailedRequests = 0
|
|
m.logger.Info("mailserver available", zap.String("address", connectedPeer.UniqueID))
|
|
m.EmitMailserverAvailable()
|
|
signal.SendMailserverAvailable(m.mailserverCycle.activeMailserver.Address, m.mailserverCycle.activeMailserver.ID)
|
|
}
|
|
// Query mailserver
|
|
go func() {
|
|
_, err := m.RequestAllHistoricMessagesWithRetries(false)
|
|
if err != nil {
|
|
m.logger.Error("failed to request historic messages", zap.Error(err))
|
|
}
|
|
}()
|
|
} else {
|
|
m.mailPeersMutex.Unlock()
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check whether we want to disconnect the mailserver
|
|
if m.mailserverCycle.activeMailserver != nil {
|
|
if m.mailserverCycle.activeMailserver.FailedRequests >= mailserverMaxFailedRequests {
|
|
m.penalizeMailserver(m.mailserverCycle.activeMailserver.ID)
|
|
signal.SendMailserverNotWorking()
|
|
m.logger.Info("connecting too many failed requests")
|
|
m.mailserverCycle.activeMailserver.FailedRequests = 0
|
|
|
|
return m.connectToNewMailserverAndWait()
|
|
}
|
|
|
|
m.mailPeersMutex.Lock()
|
|
pInfo, ok := m.mailserverCycle.peers[m.mailserverCycle.activeMailserver.ID]
|
|
m.mailPeersMutex.Unlock()
|
|
|
|
if ok {
|
|
if pInfo.status != connected && pInfo.lastConnectionAttempt.Add(20*time.Second).Before(time.Now()) {
|
|
m.logger.Info("penalizing mailserver & disconnecting connecting", zap.String("id", m.mailserverCycle.activeMailserver.ID))
|
|
|
|
signal.SendMailserverNotWorking()
|
|
m.penalizeMailserver(m.mailserverCycle.activeMailserver.ID)
|
|
m.disconnectActiveMailserver()
|
|
}
|
|
}
|
|
|
|
} else {
|
|
m.cycleMailservers()
|
|
}
|
|
|
|
m.logger.Debug("updated-peers", zap.Any("peers", m.mailserverCycle.peers))
|
|
|
|
return nil
|
|
}
|
|
|
|
func (m *Messenger) updateWakuV1PeerStatus() {
|
|
ticker := time.NewTicker(1 * time.Second)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
err := m.handleMailserverCycleEvent(m.mailserverPeersInfo())
|
|
if err != nil {
|
|
m.logger.Error("failed to handle mailserver cycle event", zap.Error(err))
|
|
continue
|
|
}
|
|
|
|
ms := m.getActiveMailserver()
|
|
if ms != nil {
|
|
node, err := ms.Enode()
|
|
if err != nil {
|
|
m.logger.Error("failed to parse enode", zap.Error(err))
|
|
continue
|
|
}
|
|
m.server.AddPeer(node)
|
|
if err := m.peerStore.Update([]*enode.Node{node}); err != nil {
|
|
m.logger.Error("failed to update peers", zap.Error(err))
|
|
continue
|
|
}
|
|
}
|
|
|
|
case <-m.mailserverCycle.events:
|
|
err := m.handleMailserverCycleEvent(m.mailserverPeersInfo())
|
|
if err != nil {
|
|
m.logger.Error("failed to handle mailserver cycle event", zap.Error(err))
|
|
return
|
|
}
|
|
case <-m.quit:
|
|
close(m.mailserverCycle.events)
|
|
m.mailserverCycle.subscription.Unsubscribe()
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (m *Messenger) verifyStorenodeStatus() {
|
|
ticker := time.NewTicker(1 * time.Second)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
err := m.disconnectStorenodeIfRequired()
|
|
if err != nil {
|
|
m.logger.Error("failed to handle mailserver cycle event", zap.Error(err))
|
|
continue
|
|
}
|
|
|
|
case <-m.quit:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (m *Messenger) getPinnedMailserver() (*mailservers.Mailserver, error) {
|
|
fleet, err := m.getFleet()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pinnedMailservers, err := m.settings.GetPinnedMailservers()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pinnedMailserver, ok := pinnedMailservers[fleet]
|
|
if !ok {
|
|
return nil, nil
|
|
}
|
|
|
|
fleetMailservers := mailservers.DefaultMailservers()
|
|
|
|
for _, c := range fleetMailservers {
|
|
if c.Fleet == fleet && c.ID == pinnedMailserver {
|
|
return &c, nil
|
|
}
|
|
}
|
|
|
|
if m.mailserversDatabase != nil {
|
|
customMailservers, err := m.mailserversDatabase.Mailservers()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, c := range customMailservers {
|
|
if c.Fleet == fleet && c.ID == pinnedMailserver {
|
|
c.Version = m.transport.WakuVersion()
|
|
return &c, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil, nil
|
|
}
|
|
|
|
func (m *Messenger) EmitMailserverAvailable() {
|
|
for _, s := range m.mailserverCycle.availabilitySubscriptions {
|
|
s <- struct{}{}
|
|
close(s)
|
|
l := len(m.mailserverCycle.availabilitySubscriptions)
|
|
m.mailserverCycle.availabilitySubscriptions = m.mailserverCycle.availabilitySubscriptions[:l-1]
|
|
}
|
|
}
|
|
|
|
func (m *Messenger) SubscribeMailserverAvailable() chan struct{} {
|
|
c := make(chan struct{})
|
|
m.mailserverCycle.availabilitySubscriptions = append(m.mailserverCycle.availabilitySubscriptions, c)
|
|
return c
|
|
}
|
|
|
|
func (m *Messenger) disconnectStorenodeIfRequired() error {
|
|
m.logger.Debug("wakuV2 storenode status verification")
|
|
|
|
if m.mailserverCycle.activeMailserver == nil {
|
|
// No active storenode, find a new one
|
|
m.cycleMailservers()
|
|
return nil
|
|
}
|
|
|
|
// Check whether we want to disconnect the active storenode
|
|
if m.mailserverCycle.activeMailserver.FailedRequests >= mailserverMaxFailedRequests {
|
|
m.penalizeMailserver(m.mailserverCycle.activeMailserver.ID)
|
|
signal.SendMailserverNotWorking()
|
|
m.logger.Info("too many failed requests", zap.String("storenode", m.mailserverCycle.activeMailserver.UniqueID()))
|
|
m.mailserverCycle.activeMailserver.FailedRequests = 0
|
|
return m.connectToNewMailserverAndWait()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (m *Messenger) waitForAvailableStoreNode(timeout time.Duration) bool {
|
|
// Add 1 second to timeout, because the mailserver cycle has 1 second ticker, which doesn't tick on start.
|
|
// This can be improved after merging https://github.com/status-im/status-go/pull/4380.
|
|
// NOTE: https://stackoverflow.com/questions/32705582/how-to-get-time-tick-to-tick-immediately
|
|
timeout += time.Second
|
|
|
|
finish := make(chan struct{})
|
|
cancel := make(chan struct{})
|
|
|
|
wg := sync.WaitGroup{}
|
|
wg.Add(1)
|
|
|
|
go func() {
|
|
defer func() {
|
|
wg.Done()
|
|
}()
|
|
for !m.isActiveMailserverAvailable() {
|
|
select {
|
|
case <-m.SubscribeMailserverAvailable():
|
|
case <-cancel:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
go func() {
|
|
defer func() {
|
|
close(finish)
|
|
}()
|
|
wg.Wait()
|
|
}()
|
|
|
|
select {
|
|
case <-finish:
|
|
case <-time.After(timeout):
|
|
close(cancel)
|
|
case <-m.ctx.Done():
|
|
close(cancel)
|
|
}
|
|
|
|
return m.isActiveMailserverAvailable()
|
|
}
|