whisper: add known message expiration to peers, cleanup
This commit is contained in:
Péter Szilágyi
parent
59bff46505
commit
e2b7498c9d
177
whisper/peer.go
177
whisper/peer.go
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@ -4,106 +4,155 @@ import (
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"fmt"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/rlp"
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"gopkg.in/fatih/set.v0"
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)
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// peer represents a whisper protocol peer connection.
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type peer struct {
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host *Whisper
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peer *p2p.Peer
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ws p2p.MsgReadWriter
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// XXX Eventually this is going to reach exceptional large space. We need an expiry here
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known *set.Set
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known *set.Set // Messages already known by the peer to avoid wasting bandwidth
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quit chan struct{}
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}
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func NewPeer(host *Whisper, p *p2p.Peer, ws p2p.MsgReadWriter) *peer {
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return &peer{host, p, ws, set.New(), make(chan struct{})}
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}
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func (self *peer) init() error {
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if err := self.handleStatus(); err != nil {
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return err
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}
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return nil
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// newPeer creates and initializes a new whisper peer connection, returning either
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// the newly constructed link or a failure reason.
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func newPeer(host *Whisper, remote *p2p.Peer, rw p2p.MsgReadWriter) (*peer, error) {
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p := &peer{
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host: host,
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peer: remote,
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ws: rw,
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known: set.New(),
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quit: make(chan struct{}),
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}
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if err := p.handshake(); err != nil {
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return nil, err
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}
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return p, nil
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}
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// start initiates the peer updater, periodically broadcasting the whisper packets
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// into the network.
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func (self *peer) start() {
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go self.update()
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self.peer.Debugln("whisper started")
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}
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// stop terminates the peer updater, stopping message forwarding to it.
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func (self *peer) stop() {
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self.peer.Debugln("whisper stopped")
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close(self.quit)
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self.peer.Debugln("whisper stopped")
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}
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func (self *peer) update() {
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relay := time.NewTicker(300 * time.Millisecond)
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out:
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for {
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select {
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case <-relay.C:
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err := self.broadcast(self.host.envelopes())
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if err != nil {
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self.peer.Infoln("broadcast err:", err)
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break out
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}
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case <-self.quit:
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break out
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}
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}
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}
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func (self *peer) broadcast(envelopes []*Envelope) error {
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envs := make([]*Envelope, 0, len(envelopes))
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for _, env := range envelopes {
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if !self.known.Has(env.Hash()) {
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envs = append(envs, env)
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self.known.Add(env.Hash())
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}
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}
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if len(envs) > 0 {
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if err := p2p.Send(self.ws, envelopesMsg, envs); err != nil {
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// handshake sends the protocol initiation status message to the remote peer and
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// verifies the remote status too.
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func (self *peer) handshake() error {
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// Send own status message, fetch remote one
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if err := p2p.SendItems(self.ws, statusCode, protocolVersion); err != nil {
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return err
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}
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self.peer.DebugDetailln("broadcasted", len(envs), "message(s)")
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}
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return nil
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}
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func (self *peer) addKnown(envelope *Envelope) {
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self.known.Add(envelope.Hash())
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}
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func (self *peer) handleStatus() error {
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ws := self.ws
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if err := p2p.SendItems(ws, statusMsg, protocolVersion); err != nil {
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return err
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}
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msg, err := ws.ReadMsg()
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packet, err := self.ws.ReadMsg()
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if err != nil {
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return err
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}
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if msg.Code != statusMsg {
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return fmt.Errorf("peer send %x before status msg", msg.Code)
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if packet.Code != statusCode {
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return fmt.Errorf("peer sent %x before status packet", packet.Code)
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}
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s := rlp.NewStream(msg.Payload)
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// Decode the rest of the status packet and verify protocol match
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s := rlp.NewStream(packet.Payload)
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if _, err := s.List(); err != nil {
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return fmt.Errorf("bad status message: %v", err)
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}
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pv, err := s.Uint()
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peerVersion, err := s.Uint()
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if err != nil {
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return fmt.Errorf("bad status message: %v", err)
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}
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if pv != protocolVersion {
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return fmt.Errorf("protocol version mismatch %d != %d", pv, protocolVersion)
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if peerVersion != protocolVersion {
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return fmt.Errorf("protocol version mismatch %d != %d", peerVersion, protocolVersion)
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}
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return msg.Discard() // ignore anything after protocol version
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return packet.Discard() // ignore anything after protocol version
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}
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// update executes periodic operations on the peer, including message transmission
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// and expiration.
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func (self *peer) update() {
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// Start the tickers for the updates
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expire := time.NewTicker(expirationTicks)
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transmit := time.NewTicker(transmissionTicks)
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// Loop and transmit until termination is requested
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for {
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select {
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case <-expire.C:
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self.expire()
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case <-transmit.C:
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if err := self.broadcast(); err != nil {
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self.peer.Infoln("broadcast failed:", err)
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return
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}
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case <-self.quit:
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return
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}
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}
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}
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// mark marks an envelope known to the peer so that it won't be sent back.
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func (self *peer) mark(envelope *Envelope) {
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self.known.Add(envelope.Hash())
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}
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// marked checks if an envelope is already known to the remote peer.
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func (self *peer) marked(envelope *Envelope) bool {
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return self.known.Has(envelope.Hash())
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}
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// expire iterates over all the known envelopes in the host and removes all
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// expired (unknown) ones from the known list.
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func (self *peer) expire() {
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// Assemble the list of available envelopes
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available := set.NewNonTS()
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for _, envelope := range self.host.envelopes() {
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available.Add(envelope.Hash())
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}
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// Cross reference availability with known status
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unmark := make(map[common.Hash]struct{})
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self.known.Each(func(v interface{}) bool {
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if !available.Has(v.(common.Hash)) {
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unmark[v.(common.Hash)] = struct{}{}
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}
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return true
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})
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// Dump all known but unavailable
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for hash, _ := range unmark {
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self.known.Remove(hash)
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}
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}
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// broadcast iterates over the collection of envelopes and transmits yet unknown
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// ones over the network.
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func (self *peer) broadcast() error {
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// Fetch the envelopes and collect the unknown ones
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envelopes := self.host.envelopes()
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transmit := make([]*Envelope, 0, len(envelopes))
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for _, envelope := range envelopes {
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if !self.marked(envelope) {
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transmit = append(transmit, envelope)
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self.mark(envelope)
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}
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}
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// Transmit the unknown batch (potentially empty)
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if err := p2p.Send(self.ws, messagesCode, transmit); err != nil {
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return err
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}
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self.peer.DebugDetailln("broadcasted", len(transmit), "message(s)")
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return nil
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}
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@ -16,8 +16,8 @@ import (
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)
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const (
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statusMsg = 0x00
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envelopesMsg = 0x01
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statusCode = 0x00
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messagesCode = 0x01
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protocolVersion uint64 = 0x02
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protocolName = "shh"
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@ -26,6 +26,7 @@ const (
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signatureLength = 65
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expirationTicks = 800 * time.Millisecond
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transmissionTicks = 300 * time.Millisecond
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)
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const (
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@ -69,7 +70,7 @@ func New() *Whisper {
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Name: protocolName,
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Version: uint(protocolVersion),
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Length: 2,
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Run: whisper.msgHandler,
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Run: whisper.handlePeer,
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}
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return whisper
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@ -168,6 +169,40 @@ func (self *Whisper) Stop() {
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return
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}*/
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// handlePeer is called by the underlying P2P layer when the whisper sub-protocol
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// connection is negotiated.
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func (self *Whisper) handlePeer(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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// Create, initialize and start the whisper peer
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whisperPeer, err := newPeer(self, peer, rw)
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if err != nil {
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return err
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}
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whisperPeer.start()
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defer whisperPeer.stop()
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// Read and process inbound messages directly to merge into client-global state
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for {
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// Fetch the next packet and decode the contained envelopes
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packet, err := rw.ReadMsg()
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if err != nil {
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return err
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}
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var envelopes []*Envelope
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if err := packet.Decode(&envelopes); err != nil {
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peer.Infof("failed to decode enveloped: %v", err)
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continue
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}
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// Inject all envelopes into the internal pool
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for _, envelope := range envelopes {
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if err := self.add(envelope); err != nil {
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// TODO Punish peer here. Invalid envelope.
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peer.Debugf("failed to pool envelope: %f", err)
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}
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whisperPeer.mark(envelope)
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}
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}
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}
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// add inserts a new envelope into the message pool to be distributed within the
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// whisper network. It also inserts the envelope into the expiration pool at the
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// appropriate time-stamp.
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@ -198,40 +233,6 @@ func (self *Whisper) add(envelope *Envelope) error {
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return nil
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}
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// Main handler for passing whisper messages to whisper peer objects
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func (self *Whisper) msgHandler(peer *p2p.Peer, ws p2p.MsgReadWriter) error {
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wpeer := NewPeer(self, peer, ws)
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// initialise whisper peer (handshake/status)
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if err := wpeer.init(); err != nil {
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return err
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}
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// kick of the main handler for broadcasting/managing envelopes
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go wpeer.start()
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defer wpeer.stop()
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// Main *read* loop. Writing is done by the peer it self.
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for {
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msg, err := ws.ReadMsg()
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if err != nil {
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return err
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}
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var envelopes []*Envelope
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if err := msg.Decode(&envelopes); err != nil {
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peer.Infoln(err)
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continue
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}
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for _, envelope := range envelopes {
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if err := self.add(envelope); err != nil {
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// TODO Punish peer here. Invalid envelope.
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peer.Debugln(err)
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}
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wpeer.addKnown(envelope)
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}
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}
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}
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// postEvent opens an envelope with the configured identities and delivers the
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// message upstream from application processing.
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func (self *Whisper) postEvent(envelope *Envelope) {
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