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waku.go
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waku.go
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// Copyright 2019 The Waku Library Authors.
//
// The Waku 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 Waku library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty off
// 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 Waku library. If not, see <http://www.gnu.org/licenses/>.
//
// This software uses the go-ethereum library, which is licensed
// under the GNU Lesser General Public Library, version 3 or any later.
package wakuv2
import (
"context"
"crypto/ecdsa"
"crypto/sha256"
"database/sql"
"errors"
"fmt"
"math"
"net"
"runtime"
"sort"
"strings"
"sync"
"time"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/p2p/protocol/identify"
"github.com/multiformats/go-multiaddr"
"go.uber.org/zap"
mapset "github.com/deckarep/golang-set"
"golang.org/x/crypto/pbkdf2"
gethcommon "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/rpc"
"github.com/libp2p/go-libp2p"
pubsub "github.com/libp2p/go-libp2p-pubsub"
"github.com/libp2p/go-libp2p/core/metrics"
"github.com/waku-org/go-waku/waku/v2/dnsdisc"
wps "github.com/waku-org/go-waku/waku/v2/peerstore"
"github.com/waku-org/go-waku/waku/v2/protocol"
"github.com/waku-org/go-waku/waku/v2/protocol/filter"
"github.com/waku-org/go-waku/waku/v2/protocol/peer_exchange"
"github.com/waku-org/go-waku/waku/v2/protocol/relay"
"github.com/status-im/status-go/connection"
"github.com/status-im/status-go/eth-node/types"
"github.com/status-im/status-go/timesource"
"github.com/status-im/status-go/wakuv2/common"
"github.com/status-im/status-go/wakuv2/persistence"
node "github.com/waku-org/go-waku/waku/v2/node"
"github.com/waku-org/go-waku/waku/v2/protocol/pb"
"github.com/waku-org/go-waku/waku/v2/protocol/store"
storepb "github.com/waku-org/go-waku/waku/v2/protocol/store/pb"
)
const messageQueueLimit = 1024
const requestTimeout = 30 * time.Second
const bootnodesQueryBackoffMs = 200
const bootnodesMaxRetries = 7
type settings struct {
LightClient bool // Indicates if the node is a light client
MinPeersForRelay int // Indicates the minimum number of peers required for using Relay Protocol
MinPeersForFilter int // Indicates the minimum number of peers required for using Filter Protocol
MaxMsgSize uint32 // Maximal message length allowed by the waku node
EnableConfirmations bool // Enable sending message confirmations
PeerExchange bool // Enable peer exchange
DiscoveryLimit int // Indicates the number of nodes to discover
Nameserver string // Optional nameserver to use for dns discovery
EnableDiscV5 bool // Indicates whether discv5 is enabled or not
Options []node.WakuNodeOption
}
// Waku represents a dark communication interface through the Ethereum
// network, using its very own P2P communication layer.
type Waku struct {
node *node.WakuNode // reference to a libp2p waku node
identifyService identify.IDService
appDB *sql.DB
dnsAddressCache map[string][]dnsdisc.DiscoveredNode // Map to store the multiaddresses returned by dns discovery
dnsAddressCacheLock *sync.RWMutex // lock to handle access to the map
// Filter-related
filters *common.Filters // Message filters installed with Subscribe function
filterSubscriptions map[*common.Filter]map[string]*filter.SubscriptionDetails // wakuv2 filter subscription details
filterPeerDisconnectMap map[peer.ID]int64
isFilterSubAlive func(sub *filter.SubscriptionDetails) error
privateKeys map[string]*ecdsa.PrivateKey // Private key storage
symKeys map[string][]byte // Symmetric key storage
keyMu sync.RWMutex // Mutex associated with key stores
envelopes map[gethcommon.Hash]*common.ReceivedMessage // Pool of envelopes currently tracked by this node
expirations map[uint32]mapset.Set // Message expiration pool
poolMu sync.RWMutex // Mutex to sync the message and expiration pools
bandwidthCounter *metrics.BandwidthCounter
protectedTopicStore *persistence.ProtectedTopicsStore
sendQueue chan *protocol.Envelope
msgQueue chan *common.ReceivedMessage // Message queue for waku messages that havent been decoded
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
cfg *Config
settings settings // Holds configuration settings that can be dynamically changed
settingsMu sync.RWMutex // Mutex to sync the settings access
envelopeFeed event.Feed
storeMsgIDs map[gethcommon.Hash]bool // Map of the currently processing ids
storeMsgIDsMu sync.RWMutex
connStatusChan chan node.ConnStatus
connStatusSubscriptions map[string]*types.ConnStatusSubscription
connStatusMu sync.Mutex
logger *zap.Logger
// NTP Synced timesource
timesource *timesource.NTPTimeSource
// seededBootnodesForDiscV5 indicates whether we manage to retrieve discovery
// bootnodes successfully
seededBootnodesForDiscV5 bool
// offline indicates whether we have detected connectivity
offline bool
// connectionChanged is channel that notifies when connectivity has changed
connectionChanged chan struct{}
// discV5BootstrapNodes is the ENR to be used to fetch bootstrap nodes for discovery
discV5BootstrapNodes []string
onHistoricMessagesRequestFailed func([]byte, peer.ID, error)
onPeerStats func(types.ConnStatus)
}
func getUsableUDPPort() (int, error) {
conn, err := net.ListenUDP("udp", &net.UDPAddr{
IP: net.IPv4zero,
Port: 0,
})
if err != nil {
return 0, err
}
defer conn.Close()
return conn.LocalAddr().(*net.UDPAddr).Port, nil
}
// New creates a WakuV2 client ready to communicate through the LibP2P network.
func New(nodeKey string, fleet string, cfg *Config, logger *zap.Logger, appDB *sql.DB, ts *timesource.NTPTimeSource, onHistoricMessagesRequestFailed func([]byte, peer.ID, error), onPeerStats func(types.ConnStatus)) (*Waku, error) {
var err error
if logger == nil {
logger, err = zap.NewDevelopment()
if err != nil {
return nil, err
}
}
if ts == nil {
ts = timesource.Default()
}
cfg = setDefaults(cfg)
if cfg.UDPPort == 0 {
cfg.UDPPort, err = getUsableUDPPort()
if err != nil {
return nil, err
}
}
logger.Debug("starting wakuv2 with config", zap.Any("config", cfg))
waku := &Waku{
appDB: appDB,
cfg: cfg,
privateKeys: make(map[string]*ecdsa.PrivateKey),
symKeys: make(map[string][]byte),
envelopes: make(map[gethcommon.Hash]*common.ReceivedMessage),
expirations: make(map[uint32]mapset.Set),
msgQueue: make(chan *common.ReceivedMessage, messageQueueLimit),
sendQueue: make(chan *protocol.Envelope, 1000),
connStatusChan: make(chan node.ConnStatus, 100),
connStatusSubscriptions: make(map[string]*types.ConnStatusSubscription),
wg: sync.WaitGroup{},
dnsAddressCache: make(map[string][]dnsdisc.DiscoveredNode),
dnsAddressCacheLock: &sync.RWMutex{},
storeMsgIDs: make(map[gethcommon.Hash]bool),
filterPeerDisconnectMap: make(map[peer.ID]int64),
filterSubscriptions: make(map[*common.Filter]map[string]*filter.SubscriptionDetails),
timesource: ts,
storeMsgIDsMu: sync.RWMutex{},
logger: logger,
discV5BootstrapNodes: cfg.DiscV5BootstrapNodes,
onHistoricMessagesRequestFailed: onHistoricMessagesRequestFailed,
onPeerStats: onPeerStats,
}
// This fn is being mocked in test
waku.isFilterSubAlive = func(sub *filter.SubscriptionDetails) error {
return waku.node.FilterLightnode().IsSubscriptionAlive(waku.ctx, sub)
}
waku.settings = settings{
MaxMsgSize: cfg.MaxMessageSize,
LightClient: cfg.LightClient,
MinPeersForRelay: cfg.MinPeersForRelay,
MinPeersForFilter: cfg.MinPeersForFilter,
PeerExchange: cfg.PeerExchange,
DiscoveryLimit: cfg.DiscoveryLimit,
Nameserver: cfg.Nameserver,
EnableDiscV5: cfg.EnableDiscV5,
}
waku.filters = common.NewFilters()
waku.bandwidthCounter = metrics.NewBandwidthCounter()
var privateKey *ecdsa.PrivateKey
if nodeKey != "" {
privateKey, err = crypto.HexToECDSA(nodeKey)
} else {
// If no nodekey is provided, create an ephemeral key
privateKey, err = crypto.GenerateKey()
}
if err != nil {
return nil, fmt.Errorf("failed to setup the go-waku private key: %v", err)
}
hostAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprint(cfg.Host, ":", cfg.Port))
if err != nil {
return nil, fmt.Errorf("failed to setup the network interface: %v", err)
}
if cfg.KeepAliveInterval == 0 {
cfg.KeepAliveInterval = DefaultConfig.KeepAliveInterval
}
libp2pOpts := node.DefaultLibP2POptions
libp2pOpts = append(libp2pOpts, libp2p.BandwidthReporter(waku.bandwidthCounter))
libp2pOpts = append(libp2pOpts, libp2p.NATPortMap())
opts := []node.WakuNodeOption{
node.WithLibP2POptions(libp2pOpts...),
node.WithPrivateKey(privateKey),
node.WithHostAddress(hostAddr),
node.WithConnectionStatusChannel(waku.connStatusChan),
node.WithKeepAlive(time.Duration(cfg.KeepAliveInterval) * time.Second),
node.WithMaxPeerConnections(cfg.DiscoveryLimit),
node.WithLogger(logger),
}
if cfg.EnableDiscV5 {
bootnodes, err := waku.getDiscV5BootstrapNodes(context.Background(), cfg.DiscV5BootstrapNodes)
if err != nil {
logger.Error("failed to get bootstrap nodes", zap.Error(err))
return nil, err
}
opts = append(opts, node.WithDiscoveryV5(uint(cfg.UDPPort), bootnodes, cfg.AutoUpdate))
}
if cfg.LightClient {
opts = append(opts, node.WithWakuFilterLightNode())
} else {
relayOpts := []pubsub.Option{
pubsub.WithMaxMessageSize(int(waku.settings.MaxMsgSize)),
}
opts = append(opts, node.WithWakuRelayAndMinPeers(waku.settings.MinPeersForRelay, relayOpts...))
}
if cfg.EnableStore {
opts = append(opts, node.WithWakuStore())
dbStore, err := persistence.NewDBStore(logger, persistence.WithDB(appDB), persistence.WithRetentionPolicy(cfg.StoreCapacity, time.Duration(cfg.StoreSeconds)*time.Second))
if err != nil {
return nil, err
}
opts = append(opts, node.WithMessageProvider(dbStore))
}
if appDB != nil {
waku.protectedTopicStore, err = persistence.NewProtectedTopicsStore(logger, appDB)
if err != nil {
return nil, err
}
}
waku.settings.Options = opts
waku.logger.Info("setup the go-waku node successfully")
return waku, nil
}
func (w *Waku) SubscribeToConnStatusChanges() *types.ConnStatusSubscription {
w.connStatusMu.Lock()
defer w.connStatusMu.Unlock()
subscription := types.NewConnStatusSubscription()
w.connStatusSubscriptions[subscription.ID] = subscription
return subscription
}
func (w *Waku) getDiscV5BootstrapNodes(ctx context.Context, addresses []string) ([]*enode.Node, error) {
wg := sync.WaitGroup{}
mu := sync.Mutex{}
var result []*enode.Node
retrieveENR := func(d dnsdisc.DiscoveredNode, wg *sync.WaitGroup) {
mu.Lock()
defer mu.Unlock()
defer wg.Done()
if d.ENR != nil {
result = append(result, d.ENR)
}
}
for _, addrString := range addresses {
if addrString == "" {
continue
}
if strings.HasPrefix(addrString, "enrtree://") {
// Use DNS Discovery
wg.Add(1)
go func(addr string) {
defer wg.Done()
w.dnsDiscover(ctx, addr, retrieveENR)
}(addrString)
} else {
// It's a normal enr
bootnode, err := enode.Parse(enode.ValidSchemes, addrString)
if err != nil {
return nil, err
}
result = append(result, bootnode)
}
}
wg.Wait()
w.seededBootnodesForDiscV5 = len(result) > 0
return result, nil
}
type fnApplyToEachPeer func(d dnsdisc.DiscoveredNode, wg *sync.WaitGroup)
func (w *Waku) dnsDiscover(ctx context.Context, enrtreeAddress string, apply fnApplyToEachPeer) {
w.logger.Info("retrieving nodes", zap.String("enr", enrtreeAddress))
ctx, cancel := context.WithTimeout(ctx, requestTimeout)
defer cancel()
w.dnsAddressCacheLock.Lock()
defer w.dnsAddressCacheLock.Unlock()
discNodes, ok := w.dnsAddressCache[enrtreeAddress]
if !ok {
w.settingsMu.RLock()
nameserver := w.settings.Nameserver
w.settingsMu.RUnlock()
var opts []dnsdisc.DnsDiscoveryOption
if nameserver != "" {
opts = append(opts, dnsdisc.WithNameserver(nameserver))
}
discoveredNodes, err := dnsdisc.RetrieveNodes(ctx, enrtreeAddress, opts...)
if err != nil {
w.logger.Warn("dns discovery error ", zap.Error(err))
return
}
if len(discoveredNodes) != 0 {
w.dnsAddressCache[enrtreeAddress] = append(w.dnsAddressCache[enrtreeAddress], discoveredNodes...)
discNodes = w.dnsAddressCache[enrtreeAddress]
}
}
wg := &sync.WaitGroup{}
wg.Add(len(discNodes))
for _, d := range discNodes {
apply(d, wg)
}
wg.Wait()
}
func (w *Waku) addWakuV2Peers(ctx context.Context, cfg *Config) error {
fnApply := func(d dnsdisc.DiscoveredNode, wg *sync.WaitGroup) {
if len(d.PeerInfo.Addrs) != 0 {
go func(ma multiaddr.Multiaddr) {
w.identifyAndConnect(ctx, w.settings.LightClient, ma)
wg.Done()
}(d.PeerInfo.Addrs[0])
}
}
identifyWg := &sync.WaitGroup{}
identifyWg.Add(len(cfg.WakuNodes))
for _, addrString := range cfg.WakuNodes {
addrString := addrString
if strings.HasPrefix(addrString, "enrtree://") {
// Use DNS Discovery
go func() {
w.dnsDiscover(ctx, addrString, fnApply)
identifyWg.Done()
}()
} else {
// It is a normal multiaddress
addr, err := multiaddr.NewMultiaddr(addrString)
if err != nil {
w.logger.Warn("invalid peer multiaddress", zap.String("ma", addrString), zap.Error(err))
continue
}
go func(ma multiaddr.Multiaddr) {
w.identifyAndConnect(ctx, cfg.LightClient, ma)
identifyWg.Done()
}(addr)
}
}
identifyWg.Wait()
return nil
}
func (w *Waku) identifyAndConnect(ctx context.Context, isLightClient bool, ma multiaddr.Multiaddr) {
peerInfo, err := peer.AddrInfoFromP2pAddr(ma)
if err != nil {
w.logger.Warn("invalid peer multiaddress", zap.String("addr", ma.String()), zap.Error(err))
return
}
ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
defer cancel()
err = w.node.Host().Connect(ctx, *peerInfo)
if err != nil {
w.logger.Error("could not extract peerinfo", zap.String("ma", ma.String()), zap.Error(err))
return
}
conns := w.node.Host().Network().ConnsToPeer(peerInfo.ID)
if len(conns) == 0 {
return // No connection
}
w.identifyService.IdentifyConn(conns[0])
if isLightClient {
err = w.node.Host().Network().ClosePeer(peerInfo.ID)
if err != nil {
w.logger.Error("could not close connections to peer", zap.Any("peer", peerInfo.ID), zap.Error(err))
}
return
}
supportedProtocols, err := w.node.Host().Peerstore().SupportsProtocols(peerInfo.ID, relay.WakuRelayID_v200)
if err != nil {
w.logger.Error("could not obtain protocols", zap.Any("peer", peerInfo.ID), zap.Error(err))
return
}
if len(supportedProtocols) == 0 {
err = w.node.Host().Network().ClosePeer(peerInfo.ID)
if err != nil {
w.logger.Error("could not close connections to peer", zap.Any("peer", peerInfo.ID), zap.Error(err))
}
}
}
func (w *Waku) telemetryBandwidthStats(telemetryServerURL string) {
if telemetryServerURL == "" {
return
}
telemetry := NewBandwidthTelemetryClient(w.logger, telemetryServerURL)
ticker := time.NewTicker(time.Second * 20)
defer ticker.Stop()
today := time.Now()
for {
select {
case <-w.ctx.Done():
return
case now := <-ticker.C:
// Reset totals when day changes
if now.Day() != today.Day() {
today = now
w.bandwidthCounter.Reset()
}
storeStats := w.bandwidthCounter.GetBandwidthForProtocol(store.StoreID_v20beta4)
relayStats := w.bandwidthCounter.GetBandwidthForProtocol(relay.WakuRelayID_v200)
go telemetry.PushProtocolStats(relayStats, storeStats)
}
}
}
func (w *Waku) GetStats() types.StatsSummary {
stats := w.bandwidthCounter.GetBandwidthTotals()
return types.StatsSummary{
UploadRate: uint64(stats.RateOut),
DownloadRate: uint64(stats.RateIn),
}
}
func (w *Waku) runPeerExchangeLoop() {
defer w.wg.Done()
if !w.settings.PeerExchange || !w.settings.LightClient {
// Currently peer exchange is only used for full nodes
// TODO: should it be used for lightpush? or lightpush nodes
// are only going to be selected from a specific set of peers?
return
}
ticker := time.NewTicker(time.Second * 5)
defer ticker.Stop()
for {
select {
case <-w.ctx.Done():
return
case <-ticker.C:
w.logger.Debug("Running peer exchange loop")
connectedPeers := w.node.Host().Network().Peers()
peersWithRelay := 0
for _, p := range connectedPeers {
supportedProtocols, err := w.node.Host().Peerstore().SupportsProtocols(p, relay.WakuRelayID_v200)
if err != nil {
continue
}
if len(supportedProtocols) != 0 {
peersWithRelay++
}
}
peersToDiscover := w.settings.DiscoveryLimit - peersWithRelay
if peersToDiscover <= 0 {
continue
}
// We select only the nodes discovered via DNS Discovery that support peer exchange
w.dnsAddressCacheLock.RLock()
var withThesePeers []peer.ID
for _, record := range w.dnsAddressCache {
for _, discoveredNode := range record {
if len(discoveredNode.PeerInfo.Addrs) == 0 {
continue
}
// Obtaining peer ID
peerIDString, err := discoveredNode.PeerInfo.Addrs[0].ValueForProtocol(multiaddr.P_P2P)
if err != nil {
w.logger.Warn("multiaddress does not contain peerID", zap.String("multiaddr", discoveredNode.PeerInfo.Addrs[0].String()))
continue // No peer ID available somehow
}
peerID, err := peer.Decode(peerIDString)
if err != nil {
w.logger.Warn("couldnt decode peerID", zap.String("peerIDString", peerIDString))
continue // Couldnt decode the peerID for some reason?
}
supportsProtocol, _ := w.node.Host().Peerstore().SupportsProtocols(peerID, peer_exchange.PeerExchangeID_v20alpha1)
if len(supportsProtocol) != 0 {
withThesePeers = append(withThesePeers, peerID)
}
}
}
w.dnsAddressCacheLock.RUnlock()
if len(withThesePeers) == 0 {
continue // No peers with peer exchange have been discovered via DNS Discovery so far, skip this iteration
}
err := w.node.PeerExchange().Request(w.ctx, peersToDiscover, peer_exchange.WithAutomaticPeerSelection(withThesePeers...))
if err != nil {
w.logger.Error("couldnt request peers via peer exchange", zap.Error(err))
}
}
}
}
func (w *Waku) subscribeToPubsubTopicWithWakuRelay(topic string, pubkey *ecdsa.PublicKey) error {
if w.settings.LightClient {
return errors.New("only available for full nodes")
}
if w.node.Relay().IsSubscribed(topic) {
return nil
}
if pubkey != nil {
err := w.node.Relay().AddSignedTopicValidator(topic, pubkey)
if err != nil {
return err
}
}
sub, err := w.node.Relay().SubscribeToTopic(context.Background(), topic)
if err != nil {
return err
}
w.wg.Add(1)
go func() {
defer w.wg.Done()
for {
select {
case <-w.ctx.Done():
sub.Unsubscribe()
return
case env := <-sub.Ch:
envelopeErrors, err := w.OnNewEnvelopes(env, common.RelayedMessageType)
if err != nil {
w.logger.Error("onNewEnvelope error", zap.Error(err))
}
// TODO: should these be handled?
_ = envelopeErrors
_ = err
}
}
}()
return nil
}
func (w *Waku) runFilterSubscriptionLoop(sub *filter.SubscriptionDetails) {
for {
select {
case <-w.ctx.Done():
return
case env, ok := <-sub.C:
if ok {
envelopeErrors, err := w.OnNewEnvelopes(env, common.RelayedMessageType)
// TODO: should these be handled?
_ = envelopeErrors
_ = err
} else {
return
}
}
}
}
func (w *Waku) runFilterMsgLoop() {
defer w.wg.Done()
if !w.settings.LightClient {
return
}
// Use it to ping filter peer(s) periodically
ticker := time.NewTicker(time.Duration(w.cfg.KeepAliveInterval) * time.Second)
defer ticker.Stop()
for {
select {
case <-w.ctx.Done():
return
case <-ticker.C:
for f, subMap := range w.filterSubscriptions {
if len(subMap) == 0 {
// All peers have disconnected on previous iteration,
// attempt full reconnect
err := w.subscribeToFilter(f)
if err != nil {
w.logger.Error("Failed to subscribe to filter")
}
break
}
for id, sub := range subMap {
err := w.isFilterSubAlive(sub)
if err != nil {
// Unsubscribe on light node
contentFilter := w.buildContentFilter(f.PubsubTopic, f.Topics)
// TODO Better return value handling for WakuFilterPushResult
_, err := w.node.FilterLightnode().Unsubscribe(w.ctx, contentFilter, filter.Peer(sub.PeerID))
if err != nil {
w.logger.Warn("could not unsubscribe wakuv2 filter for peer", zap.Any("peer", sub.PeerID))
continue
}
// Remove entry from maps
w.filterPeerDisconnectMap[sub.PeerID] = time.Now().Unix()
delete(subMap, id)
// Re-subscribe
peers := w.findFilterPeers()
if len(peers) > 0 && len(subMap) < w.settings.MinPeersForFilter {
subDetails, err := w.node.FilterLightnode().Subscribe(w.ctx, contentFilter, filter.WithPeer(peers[0]))
if err != nil {
w.logger.Warn("could not add wakuv2 filter for peer", zap.Any("peer", peers[0]))
break
}
subMap[subDetails.ID] = subDetails
go w.runFilterSubscriptionLoop(subDetails)
break
}
}
}
}
}
}
}
func (w *Waku) buildContentFilter(pubsubTopic string, topics [][]byte) filter.ContentFilter {
contentFilter := filter.ContentFilter{
Topic: pubsubTopic,
}
for _, topic := range topics {
contentFilter.ContentTopics = append(contentFilter.ContentTopics, common.BytesToTopic(topic).ContentTopic())
}
return contentFilter
}
// MaxMessageSize returns the maximum accepted message size.
func (w *Waku) MaxMessageSize() uint32 {
w.settingsMu.RLock()
defer w.settingsMu.RUnlock()
return w.settings.MaxMsgSize
}
// ConfirmationsEnabled returns true if message confirmations are enabled.
func (w *Waku) ConfirmationsEnabled() bool {
w.settingsMu.RLock()
defer w.settingsMu.RUnlock()
return w.settings.EnableConfirmations
}
// CurrentTime returns current time.
func (w *Waku) CurrentTime() time.Time {
return w.timesource.Now()
}
// APIs returns the RPC descriptors the Waku implementation offers
func (w *Waku) APIs() []rpc.API {
return []rpc.API{
{
Namespace: Name,
Version: VersionStr,
Service: NewPublicWakuAPI(w),
Public: false,
},
}
}
// Protocols returns the waku sub-protocols ran by this particular client.
func (w *Waku) Protocols() []p2p.Protocol {
return []p2p.Protocol{}
}
func (w *Waku) SendEnvelopeEvent(event common.EnvelopeEvent) int {
return w.envelopeFeed.Send(event)
}
// SubscribeEnvelopeEvents subscribes to envelopes feed.
// In order to prevent blocking waku producers events must be amply buffered.
func (w *Waku) SubscribeEnvelopeEvents(events chan<- common.EnvelopeEvent) event.Subscription {
return w.envelopeFeed.Subscribe(events)
}
// NewKeyPair generates a new cryptographic identity for the client, and injects
// it into the known identities for message decryption. Returns ID of the new key pair.
func (w *Waku) NewKeyPair() (string, error) {
key, err := crypto.GenerateKey()
if err != nil || !validatePrivateKey(key) {
key, err = crypto.GenerateKey() // retry once
}
if err != nil {
return "", err
}
if !validatePrivateKey(key) {
return "", fmt.Errorf("failed to generate valid key")
}
id, err := toDeterministicID(hexutil.Encode(crypto.FromECDSAPub(&key.PublicKey)), common.KeyIDSize)
if err != nil {
return "", err
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
if w.privateKeys[id] != nil {
return "", fmt.Errorf("failed to generate unique ID")
}
w.privateKeys[id] = key
return id, nil
}
// DeleteKeyPair deletes the specified key if it exists.
func (w *Waku) DeleteKeyPair(key string) bool {
deterministicID, err := toDeterministicID(key, common.KeyIDSize)
if err != nil {
return false
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
if w.privateKeys[deterministicID] != nil {
delete(w.privateKeys, deterministicID)
return true
}
return false
}
// AddKeyPair imports a asymmetric private key and returns it identifier.
func (w *Waku) AddKeyPair(key *ecdsa.PrivateKey) (string, error) {
id, err := makeDeterministicID(hexutil.Encode(crypto.FromECDSAPub(&key.PublicKey)), common.KeyIDSize)
if err != nil {
return "", err
}
if w.HasKeyPair(id) {
return id, nil // no need to re-inject
}
w.keyMu.Lock()
w.privateKeys[id] = key
w.keyMu.Unlock()
return id, nil
}
// SelectKeyPair adds cryptographic identity, and makes sure
// that it is the only private key known to the node.
func (w *Waku) SelectKeyPair(key *ecdsa.PrivateKey) error {
id, err := makeDeterministicID(hexutil.Encode(crypto.FromECDSAPub(&key.PublicKey)), common.KeyIDSize)
if err != nil {
return err
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
w.privateKeys = make(map[string]*ecdsa.PrivateKey) // reset key store
w.privateKeys[id] = key
return nil
}
// DeleteKeyPairs removes all cryptographic identities known to the node
func (w *Waku) DeleteKeyPairs() error {
w.keyMu.Lock()
defer w.keyMu.Unlock()
w.privateKeys = make(map[string]*ecdsa.PrivateKey)
return nil
}
// HasKeyPair checks if the waku node is configured with the private key
// of the specified public pair.
func (w *Waku) HasKeyPair(id string) bool {
deterministicID, err := toDeterministicID(id, common.KeyIDSize)
if err != nil {
return false
}
w.keyMu.RLock()
defer w.keyMu.RUnlock()
return w.privateKeys[deterministicID] != nil
}
// GetPrivateKey retrieves the private key of the specified identity.
func (w *Waku) GetPrivateKey(id string) (*ecdsa.PrivateKey, error) {
deterministicID, err := toDeterministicID(id, common.KeyIDSize)
if err != nil {
return nil, err
}
w.keyMu.RLock()
defer w.keyMu.RUnlock()
key := w.privateKeys[deterministicID]
if key == nil {
return nil, fmt.Errorf("invalid id")
}
return key, nil
}
// GenerateSymKey generates a random symmetric key and stores it under id,
// which is then returned. Will be used in the future for session key exchange.
func (w *Waku) GenerateSymKey() (string, error) {
key, err := common.GenerateSecureRandomData(common.AESKeyLength)
if err != nil {
return "", err
} else if !common.ValidateDataIntegrity(key, common.AESKeyLength) {
return "", fmt.Errorf("error in GenerateSymKey: crypto/rand failed to generate random data")
}
id, err := common.GenerateRandomID()
if err != nil {
return "", fmt.Errorf("failed to generate ID: %s", err)
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
if w.symKeys[id] != nil {
return "", fmt.Errorf("failed to generate unique ID")
}
w.symKeys[id] = key
return id, nil
}
// AddSymKey stores the key with a given id.
func (w *Waku) AddSymKey(id string, key []byte) (string, error) {
deterministicID, err := toDeterministicID(id, common.KeyIDSize)
if err != nil {
return "", err
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
if w.symKeys[deterministicID] != nil {
return "", fmt.Errorf("key already exists: %v", id)
}
w.symKeys[deterministicID] = key
return deterministicID, nil
}
// AddSymKeyDirect stores the key, and returns its id.
func (w *Waku) AddSymKeyDirect(key []byte) (string, error) {
if len(key) != common.AESKeyLength {
return "", fmt.Errorf("wrong key size: %d", len(key))
}
id, err := common.GenerateRandomID()
if err != nil {
return "", fmt.Errorf("failed to generate ID: %s", err)
}
w.keyMu.Lock()
defer w.keyMu.Unlock()
if w.symKeys[id] != nil {
return "", fmt.Errorf("failed to generate unique ID")
}
w.symKeys[id] = key
return id, nil
}
// AddSymKeyFromPassword generates the key from password, stores it, and returns its id.
func (w *Waku) AddSymKeyFromPassword(password string) (string, error) {
id, err := common.GenerateRandomID()
if err != nil {
return "", fmt.Errorf("failed to generate ID: %s", err)
}
if w.HasSymKey(id) {
return "", fmt.Errorf("failed to generate unique ID")
}
// kdf should run no less than 0.1 seconds on an average computer,
// because it's an once in a session experience
derived := pbkdf2.Key([]byte(password), nil, 65356, common.AESKeyLength, sha256.New)
w.keyMu.Lock()
defer w.keyMu.Unlock()
// double check is necessary, because deriveKeyMaterial() is very slow
if w.symKeys[id] != nil {
return "", fmt.Errorf("critical error: failed to generate unique ID")
}
w.symKeys[id] = derived
return id, nil
}