mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-23 12:07:17 +00:00
246 lines
4.7 KiB
Go
246 lines
4.7 KiB
Go
package whisper
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import (
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"bytes"
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"crypto/ecdsa"
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"errors"
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"fmt"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/event/filter"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/obscuren/ecies"
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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 MessageEvent struct {
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To *ecdsa.PrivateKey
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From *ecdsa.PublicKey
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Message *Message
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}
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const DefaultTtl = 50 * time.Second
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var wlogger = logger.NewLogger("SHH")
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type Whisper struct {
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protocol p2p.Protocol
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filters *filter.Filters
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mmu sync.RWMutex
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messages map[Hash]*Envelope
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expiry map[uint32]*set.SetNonTS
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quit chan struct{}
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keys []*ecdsa.PrivateKey
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}
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func New() *Whisper {
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whisper := &Whisper{
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messages: make(map[Hash]*Envelope),
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filters: filter.New(),
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expiry: make(map[uint32]*set.SetNonTS),
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quit: make(chan struct{}),
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}
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whisper.filters.Start()
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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) Start() {
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wlogger.Infoln("Whisper started")
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go self.update()
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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(envelope *Envelope) error {
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return self.add(envelope)
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}
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func (self *Whisper) NewIdentity() *ecdsa.PrivateKey {
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key, err := crypto.GenerateKey()
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if err != nil {
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panic(err)
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}
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self.keys = append(self.keys, key)
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return key
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}
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func (self *Whisper) HasIdentity(key *ecdsa.PrivateKey) bool {
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for _, key := range self.keys {
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if key.D.Cmp(key.D) == 0 {
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return true
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}
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}
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return false
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}
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func (self *Whisper) Watch(opts Filter) int {
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return self.filters.Install(filter.Generic{
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Str1: string(crypto.FromECDSA(opts.To)),
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Str2: string(crypto.FromECDSAPub(opts.From)),
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Fn: func(data interface{}) {
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opts.Fn(data.(*Message))
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},
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})
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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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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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fmt.Println("recv")
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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.Infoln(err)
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}
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wpeer.addKnown(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) error {
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if !envelope.valid() {
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return errors.New("invalid pow provided for envelope")
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}
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self.mmu.Lock()
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defer self.mmu.Unlock()
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hash := envelope.Hash()
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self.messages[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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if !self.expiry[envelope.Expiry].Has(hash) {
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self.expiry[envelope.Expiry].Add(hash)
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self.postEvent(envelope)
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}
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return nil
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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 := uint32(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) postEvent(envelope *Envelope) {
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for _, key := range self.keys {
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if message, err := envelope.Open(key); err == nil || (err != nil && err == ecies.ErrInvalidPublicKey) {
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// Create a custom filter?
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self.filters.Notify(filter.Generic{
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Str1: string(crypto.FromECDSA(key)), Str2: string(crypto.FromECDSAPub(message.Recover())),
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}, message)
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} else {
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wlogger.Infoln(err)
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}
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}
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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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