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package whisper
import (
"fmt"
"io/ioutil"
"time"
"github.com/ethereum/go-ethereum/p2p"
"gopkg.in/fatih/set.v0"
)
const (
protocolVersion = 0x02
)
type peer struct {
host *Whisper
peer *p2p.Peer
ws p2p.MsgReadWriter
// XXX Eventually this is going to reach exceptional large space. We need an expiry here
known *set.Set
quit chan struct{}
}
func NewPeer(host *Whisper, p *p2p.Peer, ws p2p.MsgReadWriter) *peer {
return &peer{host, p, ws, set.New(), make(chan struct{})}
}
func (self *peer) init() error {
if err := self.handleStatus(); err != nil {
return err
}
return nil
}
func (self *peer) start() {
go self.update()
self.peer.Infoln("whisper started")
}
func (self *peer) stop() {
self.peer.Infoln("whisper stopped")
close(self.quit)
}
func (self *peer) update() {
relay := time.NewTicker(300 * time.Millisecond)
out:
for {
select {
case <-relay.C:
err := self.broadcast(self.host.envelopes())
if err != nil {
self.peer.Infoln("broadcast err:", err)
break out
}
case <-self.quit:
break out
}
}
}
func (self *peer) broadcast(envelopes []*Envelope) error {
envs := make([]interface{}, len(envelopes))
i := 0
for _, envelope := range envelopes {
if !self.known.Has(envelope.Hash()) {
envs[i] = envelope
self.known.Add(envelope.Hash())
i++
}
}
if i > 0 {
msg := p2p.NewMsg(envelopesMsg, envs[:i]...)
if err := self.ws.WriteMsg(msg); err != nil {
return err
}
self.peer.Infoln("broadcasted", i, "message(s)")
}
return nil
}
func (self *peer) addKnown(envelope *Envelope) {
self.known.Add(envelope.Hash())
}
func (self *peer) handleStatus() error {
ws := self.ws
if err := ws.WriteMsg(self.statusMsg()); err != nil {
return err
}
msg, err := ws.ReadMsg()
if err != nil {
return err
}
if msg.Code != statusMsg {
return fmt.Errorf("peer send %x before status msg", msg.Code)
}
data, err := ioutil.ReadAll(msg.Payload)
if err != nil {
return err
}
if len(data) == 0 {
return fmt.Errorf("malformed status. data len = 0")
}
if pv := data[0]; pv != protocolVersion {
return fmt.Errorf("protocol version mismatch %d != %d", pv, protocolVersion)
}
return nil
}
func (self *peer) statusMsg() p2p.Msg {
return p2p.NewMsg(statusMsg, protocolVersion)
}
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