129 lines
2.2 KiB
Go
129 lines
2.2 KiB
Go
package whisper
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import (
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"fmt"
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"io/ioutil"
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"time"
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"github.com/ethereum/go-ethereum/p2p"
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"gopkg.in/fatih/set.v0"
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)
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const (
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protocolVersion = 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.Infoln("whisper started")
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}
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func (self *peer) stop() {
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self.peer.Infoln("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([]interface{}, len(envelopes))
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i := 0
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for _, envelope := range envelopes {
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if !self.known.Has(envelope.Hash()) {
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envs[i] = envelope
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self.known.Add(envelope.Hash())
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i++
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}
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}
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if i > 0 {
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msg := p2p.NewMsg(envelopesMsg, envs[:i]...)
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if err := self.ws.WriteMsg(msg); err != nil {
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return err
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}
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self.peer.Infoln("broadcasted", i, "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 := ws.WriteMsg(self.statusMsg()); 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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data, err := ioutil.ReadAll(msg.Payload)
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if err != nil {
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return err
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}
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if len(data) == 0 {
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return fmt.Errorf("malformed status. data len = 0")
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}
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if pv := data[0]; 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 nil
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}
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func (self *peer) statusMsg() p2p.Msg {
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return p2p.NewMsg(statusMsg, protocolVersion)
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}
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