114 lines
2.2 KiB
Go
114 lines
2.2 KiB
Go
package whisper
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import (
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"fmt"
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"time"
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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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const (
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protocolVersion uint64 = 0x02
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)
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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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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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}
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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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func (self *peer) stop() {
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self.peer.Debugln("whisper stopped")
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close(self.quit)
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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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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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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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}
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s := rlp.NewStream(msg.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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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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}
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return msg.Discard() // ignore anything after protocol version
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}
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