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Merge pull request #16210 from gluk256/288-filter-optimization

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whisper: message filtering optimization

Only run the message through filters who registered their interest.
This commit is contained in:
Guillaume Ballet 2018-02-28 17:28:09 +01:00 committed by GitHub
commit 9b4e182ce5
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 76 additions and 78 deletions
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96
whisper/whisperv6/filter.go
View File

@ -35,6 +35,7 @@ type Filter struct {
PoW float64 // Proof of work as described in the Whisper spec
AllowP2P bool // Indicates whether this filter is interested in direct peer-to-peer messages
SymKeyHash common.Hash // The Keccak256Hash of the symmetric key, needed for optimization
id string // unique identifier
Messages map[common.Hash]*ReceivedMessage
mutex sync.RWMutex
@ -43,15 +44,21 @@ type Filter struct {
// Filters represents a collection of filters
type Filters struct {
watchers map[string]*Filter
whisper *Whisper
mutex sync.RWMutex
topicMatcher map[TopicType]map[*Filter]struct{} // map a topic to the filters that are interested in being notified when a message matches that topic
allTopicsMatcher map[*Filter]struct{} // list all the filters that will be notified of a new message, no matter what its topic is
whisper *Whisper
mutex sync.RWMutex
}
// NewFilters returns a newly created filter collection
func NewFilters(w *Whisper) *Filters {
return &Filters{
watchers: make(map[string]*Filter),
whisper: w,
watchers: make(map[string]*Filter),
topicMatcher: make(map[TopicType]map[*Filter]struct{}),
allTopicsMatcher: make(map[*Filter]struct{}),
whisper: w,
}
}
@ -81,7 +88,9 @@ func (fs *Filters) Install(watcher *Filter) (string, error) {
watcher.SymKeyHash = crypto.Keccak256Hash(watcher.KeySym)
}
watcher.id = id
fs.watchers[id] = watcher
fs.addTopicMatcher(watcher)
return id, err
}
@ -91,12 +100,51 @@ func (fs *Filters) Uninstall(id string) bool {
fs.mutex.Lock()
defer fs.mutex.Unlock()
if fs.watchers[id] != nil {
fs.removeFromTopicMatchers(fs.watchers[id])
delete(fs.watchers, id)
return true
}
return false
}
// addTopicMatcher adds a filter to the topic matchers.
// If the filter's Topics array is empty, it will be tried on every topic.
// Otherwise, it will be tried on the topics specified.
func (fs *Filters) addTopicMatcher(watcher *Filter) {
if len(watcher.Topics) == 0 {
fs.allTopicsMatcher[watcher] = struct{}{}
} else {
for _, t := range watcher.Topics {
topic := BytesToTopic(t)
if fs.topicMatcher[topic] == nil {
fs.topicMatcher[topic] = make(map[*Filter]struct{})
}
fs.topicMatcher[topic][watcher] = struct{}{}
}
}
}
// removeFromTopicMatchers removes a filter from the topic matchers
func (fs *Filters) removeFromTopicMatchers(watcher *Filter) {
delete(fs.allTopicsMatcher, watcher)
for _, topic := range watcher.Topics {
delete(fs.topicMatcher[BytesToTopic(topic)], watcher)
}
}
// getWatchersByTopic returns a slice containing the filters that
// match a specific topic
func (fs *Filters) getWatchersByTopic(topic TopicType) []*Filter {
res := make([]*Filter, 0, len(fs.allTopicsMatcher))
for watcher := range fs.allTopicsMatcher {
res = append(res, watcher)
}
for watcher := range fs.topicMatcher[topic] {
res = append(res, watcher)
}
return res
}
// Get returns a filter from the collection with a specific ID
func (fs *Filters) Get(id string) *Filter {
fs.mutex.RLock()
@ -112,11 +160,10 @@ func (fs *Filters) NotifyWatchers(env *Envelope, p2pMessage bool) {
fs.mutex.RLock()
defer fs.mutex.RUnlock()
i := -1 // only used for logging info
for _, watcher := range fs.watchers {
i++
candidates := fs.getWatchersByTopic(env.Topic)
for _, watcher := range candidates {
if p2pMessage && !watcher.AllowP2P {
log.Trace(fmt.Sprintf("msg [%x], filter [%d]: p2p messages are not allowed", env.Hash(), i))
log.Trace(fmt.Sprintf("msg [%x], filter [%s]: p2p messages are not allowed", env.Hash(), watcher.id))
continue
}
@ -128,10 +175,10 @@ func (fs *Filters) NotifyWatchers(env *Envelope, p2pMessage bool) {
if match {
msg = env.Open(watcher)
if msg == nil {
log.Trace("processing message: failed to open", "message", env.Hash().Hex(), "filter", i)
log.Trace("processing message: failed to open", "message", env.Hash().Hex(), "filter", watcher.id)
}
} else {
log.Trace("processing message: does not match", "message", env.Hash().Hex(), "filter", i)
log.Trace("processing message: does not match", "message", env.Hash().Hex(), "filter", watcher.id)
}
}
@ -194,16 +241,17 @@ func (f *Filter) Retrieve() (all []*ReceivedMessage) {
// MatchMessage checks if the filter matches an already decrypted
// message (i.e. a Message that has already been handled by
// MatchEnvelope when checked by a previous filter)
// MatchEnvelope when checked by a previous filter).
// Topics are not checked here, since this is done by topic matchers.
func (f *Filter) MatchMessage(msg *ReceivedMessage) bool {
if f.PoW > 0 && msg.PoW < f.PoW {
return false
}
if f.expectsAsymmetricEncryption() && msg.isAsymmetricEncryption() {
return IsPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst) && f.MatchTopic(msg.Topic)
return IsPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst)
} else if f.expectsSymmetricEncryption() && msg.isSymmetricEncryption() {
return f.SymKeyHash == msg.SymKeyHash && f.MatchTopic(msg.Topic)
return f.SymKeyHash == msg.SymKeyHash
}
return false
}
@ -211,27 +259,9 @@ func (f *Filter) MatchMessage(msg *ReceivedMessage) bool {
// MatchEnvelope checks if it's worth decrypting the message. If
// it returns `true`, client code is expected to attempt decrypting
// the message and subsequently call MatchMessage.
// Topics are not checked here, since this is done by topic matchers.
func (f *Filter) MatchEnvelope(envelope *Envelope) bool {
if f.PoW > 0 && envelope.pow < f.PoW {
return false
}
return f.MatchTopic(envelope.Topic)
}
// MatchTopic checks that the filter captures a given topic.
func (f *Filter) MatchTopic(topic TopicType) bool {
if len(f.Topics) == 0 {
// any topic matches
return true
}
for _, bt := range f.Topics {
if matchSingleTopic(topic, bt) {
return true
}
}
return false
return f.PoW <= 0 || envelope.pow >= f.PoW
}
func matchSingleTopic(topic TopicType, bt []byte) bool {

29
whisper/whisperv6/filter_test.go
View File

@ -303,9 +303,8 @@ func TestMatchEnvelope(t *testing.T) {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
params.Topic[0] = 0xFF // ensure mismatch
params.Topic[0] = 0xFF // topic mismatch
// mismatch with pseudo-random data
msg, err := NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
@ -314,14 +313,6 @@ func TestMatchEnvelope(t *testing.T) {
if err != nil {
t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
}
match := fsym.MatchEnvelope(env)
if match {
t.Fatalf("failed MatchEnvelope symmetric with seed %d.", seed)
}
match = fasym.MatchEnvelope(env)
if match {
t.Fatalf("failed MatchEnvelope asymmetric with seed %d.", seed)
}
// encrypt symmetrically
i := mrand.Int() % 4
@ -337,7 +328,7 @@ func TestMatchEnvelope(t *testing.T) {
}
// symmetric + matching topic: match
match = fsym.MatchEnvelope(env)
match := fsym.MatchEnvelope(env)
if !match {
t.Fatalf("failed MatchEnvelope() symmetric with seed %d.", seed)
}
@ -396,7 +387,7 @@ func TestMatchEnvelope(t *testing.T) {
// asymmetric + matching topic: match
fasym.Topics[i] = fasym.Topics[i+1]
match = fasym.MatchEnvelope(env)
if match {
if !match {
t.Fatalf("failed MatchEnvelope(asymmetric + matching topic) with seed %d.", seed)
}
@ -431,7 +422,8 @@ func TestMatchEnvelope(t *testing.T) {
// filter with topic + envelope without topic: mismatch
fasym.Topics = fsym.Topics
match = fasym.MatchEnvelope(env)
if match {
if !match {
// topic mismatch should have no affect, as topics are handled by topic matchers
t.Fatalf("failed MatchEnvelope(filter without topic + envelope without topic) with seed %d.", seed)
}
}
@ -487,7 +479,8 @@ func TestMatchMessageSym(t *testing.T) {
// topic mismatch
f.Topics[index][0]++
if f.MatchMessage(msg) {
if !f.MatchMessage(msg) {
// topic mismatch should have no affect, as topics are handled by topic matchers
t.Fatalf("failed MatchEnvelope(topic mismatch) with seed %d.", seed)
}
f.Topics[index][0]--
@ -580,7 +573,8 @@ func TestMatchMessageAsym(t *testing.T) {
// topic mismatch
f.Topics[index][0]++
if f.MatchMessage(msg) {
if !f.MatchMessage(msg) {
// topic mismatch should have no affect, as topics are handled by topic matchers
t.Fatalf("failed MatchEnvelope(topic mismatch) with seed %d.", seed)
}
f.Topics[index][0]--
@ -829,8 +823,9 @@ func TestVariableTopics(t *testing.T) {
f.Topics[i][lastTopicByte]++
match = f.MatchEnvelope(env)
if match {
t.Fatalf("MatchEnvelope symmetric with seed %d, step %d: false positive.", seed, i)
if !match {
// topic mismatch should have no affect, as topics are handled by topic matchers
t.Fatalf("MatchEnvelope symmetric with seed %d, step %d.", seed, i)
}
}
}

18
whisper/whisperv6/whisper.go
View File

@ -928,24 +928,6 @@ func (whisper *Whisper) Envelopes() []*Envelope {
return all
}
// Messages iterates through all currently floating envelopes
// and retrieves all the messages, that this filter could decrypt.
func (whisper *Whisper) Messages(id string) []*ReceivedMessage {
result := make([]*ReceivedMessage, 0)
whisper.poolMu.RLock()
defer whisper.poolMu.RUnlock()
if filter := whisper.filters.Get(id); filter != nil {
for _, env := range whisper.envelopes {
msg := filter.processEnvelope(env)
if msg != nil {
result = append(result, msg)
}
}
}
return result
}
// isEnvelopeCached checks if envelope with specific hash has already been received and cached.
func (whisper *Whisper) isEnvelopeCached(hash common.Hash) bool {
whisper.poolMu.Lock()

11
whisper/whisperv6/whisper_test.go
View File

@ -75,10 +75,6 @@ func TestWhisperBasic(t *testing.T) {
if len(mail) != 0 {
t.Fatalf("failed w.Envelopes().")
}
m := w.Messages("non-existent")
if len(m) != 0 {
t.Fatalf("failed w.Messages.")
}
derived := pbkdf2.Key([]byte(peerID), nil, 65356, aesKeyLength, sha256.New)
if !validateDataIntegrity(derived, aesKeyLength) {
@ -593,7 +589,7 @@ func TestCustomization(t *testing.T) {
}
// check w.messages()
id, err := w.Subscribe(f)
_, err = w.Subscribe(f)
if err != nil {
t.Fatalf("failed subscribe with seed %d: %s.", seed, err)
}
@ -602,11 +598,6 @@ func TestCustomization(t *testing.T) {
if len(mail) > 0 {
t.Fatalf("received premature mail")
}
mail = w.Messages(id)
if len(mail) != 2 {
t.Fatalf("failed to get whisper messages")
}
}
func TestSymmetricSendCycle(t *testing.T) {