168 lines
3.0 KiB
Go
168 lines
3.0 KiB
Go
package whisper
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import (
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"bytes"
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"sync"
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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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// MOVE ME
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type Hash struct {
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hash string
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}
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var EmptyHash Hash
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func H(hash []byte) Hash {
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return Hash{string(hash)}
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}
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func HS(hash string) Hash {
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return Hash{hash}
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}
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func (self Hash) Compare(other Hash) int {
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return bytes.Compare([]byte(self.hash), []byte(other.hash))
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}
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// MOVE ME END
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const (
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statusMsg = 0x0
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envelopesMsg = 0x01
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)
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type Whisper struct {
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pub, sec []byte
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protocol p2p.Protocol
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mmu sync.RWMutex
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messages map[Hash]*Envelope
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expiry map[int32]*set.SetNonTS
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quit chan struct{}
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}
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func New(pub, sec []byte) *Whisper {
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whisper := &Whisper{
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pub: pub,
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sec: sec,
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messages: make(map[Hash]*Envelope),
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expiry: make(map[int32]*set.SetNonTS),
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quit: make(chan struct{}),
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}
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go whisper.update()
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// p2p whisper sub protocol handler
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whisper.protocol = p2p.Protocol{
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Name: "shh",
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Version: 2,
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Length: 2,
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Run: whisper.msgHandler,
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}
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return whisper
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}
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func (self *Whisper) Stop() {
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close(self.quit)
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}
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func (self *Whisper) Send(ttl time.Duration, topics [][]byte, data *Message) {
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envelope := NewEnvelope(ttl, topics, data)
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envelope.Seal()
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self.add(envelope)
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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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// init 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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envelope, err := NewEnvelopeFromReader(msg.Payload)
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if err != nil {
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peer.Infoln(err)
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continue
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}
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self.add(envelope)
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}
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}
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// takes care of adding envelopes to the messages pool. At this moment no sanity checks are being performed.
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func (self *Whisper) add(envelope *Envelope) {
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self.mmu.Lock()
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defer self.mmu.Unlock()
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self.messages[envelope.Hash()] = envelope
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if self.expiry[envelope.Expiry] == nil {
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self.expiry[envelope.Expiry] = set.NewNonTS()
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}
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self.expiry[envelope.Expiry].Add(envelope.Hash())
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}
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func (self *Whisper) update() {
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expire := time.NewTicker(800 * time.Millisecond)
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out:
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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 <-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 *Whisper) expire() {
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self.mmu.Lock()
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defer self.mmu.Unlock()
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now := int32(time.Now().Unix())
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for then, hashSet := range self.expiry {
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if then > now {
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continue
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}
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hashSet.Each(func(v interface{}) bool {
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delete(self.messages, v.(Hash))
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return true
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})
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self.expiry[then].Clear()
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}
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}
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func (self *Whisper) envelopes() (envelopes []*Envelope) {
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self.mmu.RLock()
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defer self.mmu.RUnlock()
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envelopes = make([]*Envelope, len(self.messages))
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i := 0
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for _, envelope := range self.messages {
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envelopes[i] = envelope
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i++
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}
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return
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}
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func (self *Whisper) Protocol() p2p.Protocol {
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return self.protocol
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}
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