Add `shhext_getNewFilterMessages` function to RPC APIs.

This function returns only the new messages from the filter, never
returns the same message for the same user twice.

Gopkg.lock

@@ -483,6 +483,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "bc797975b48cf461eb29215dfd5870a3f74a1f4cf1172bdd11372d1d693461ea"
+  inputs-digest = "52c415dac55089fc7b13ce6cd05f773a88a62e5e472952f13eb49c4605711f90"
   solver-name = "gps-cdcl"
   solver-version = 1

Makefile

@@ -123,7 +123,7 @@ docker-test: ##@tests Run tests in a docker container with golang.
 test: test-unit-coverage ##@tests Run basic, short tests during development
 
 test-unit: ##@tests Run unit and integration tests
-	go test $(UNIT_TEST_PACKAGES) $(gotest_extraflags)
+	go test -v $(UNIT_TEST_PACKAGES) $(gotest_extraflags)
 
 test-unit-coverage: ##@tests Run unit and integration tests with coverage
 	go test -coverpkg= $(UNIT_TEST_PACKAGES) $(gotest_extraflags)

_assets/patches/geth/0014-whisperv6-notifications.patch

@@ -190,3 +190,19 @@ index 880cced09..702556079 100644
  func isFullNode(bloom []byte) bool {
  	if bloom == nil {
  		return true
+@@ -1048,3 +1139,15 @@ func addBloom(a, b []byte) []byte {
+ 	}
+ 	return c
+ }
++
++// SelectedKeyPairID returns the id of currently selected key pair.
++// It helps distinguish between different users w/o exposing the user identity itself.
++func (whisper *Whisper) SelectedKeyPairID() string {
++	whisper.keyMu.RLock()
++	defer whisper.keyMu.RUnlock()
++
++	for id := range whisper.privateKeys {
++		return id
++	}
++	return ""
++}

geth/db/db.go

@@ -1,14 +1,50 @@
 package db
 
 import (
+	"path/filepath"
+
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/syndtr/goleveldb/leveldb"
 	"github.com/syndtr/goleveldb/leveldb/errors"
 	"github.com/syndtr/goleveldb/leveldb/opt"
+	"github.com/syndtr/goleveldb/leveldb/storage"
 )
 
+type storagePrefix byte
+
+const (
+	// PeersCache is used for the db entries used for peers DB
+	PeersCache storagePrefix = iota
+	// DeduplicatorCache is used for the db entries used for messages
+	// deduplication cache
+	DeduplicatorCache
+)
+
+// Key creates a DB key for a specified service with specified data
+func Key(prefix storagePrefix, data ...[]byte) []byte {
+	keyLength := 1
+	for _, d := range data {
+		keyLength += len(d)
+	}
+	key := make([]byte, keyLength)
+	key[0] = byte(prefix)
+	startPos := 1
+	for _, d := range data {
+		copy(key[startPos:], d[:])
+		startPos += len(d)
+	}
+
+	return key
+}
+
 // Create returns status pointer to leveldb.DB.
-func Create(path string) (*leveldb.DB, error) {
+func Create(path, dbName string) (*leveldb.DB, error) {
+	// Create euphemeral storage if the node config path isn't provided
+	if path == "" {
+		return leveldb.Open(storage.NewMemStorage(), nil)
+	}
+
+	path = filepath.Join(path, dbName)
 	opts := &opt.Options{OpenFilesCacheCapacity: 5}
 	db, err := leveldb.OpenFile(path, opts)
 	if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {

geth/db/db_test.go

@@ -0,0 +1,37 @@
+package db
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDBKey(t *testing.T) {
+	data1 := []byte{0x01, 0x02, 0x03}
+	data2 := []byte{0x04, 0x05, 0x06, 0x07, 0x08}
+
+	key := Key(PeersCache, data1, data2)
+	assert.Equal(t, len(data1)+len(data2)+1, len(key))
+	assert.Equal(t, byte(PeersCache), key[0])
+
+	expectedKey := append([]byte{byte(PeersCache)}, data1...)
+	expectedKey = append(expectedKey, data2...)
+
+	assert.Equal(t, expectedKey, key)
+
+	key = Key(DeduplicatorCache, data1)
+	assert.Equal(t, len(data1)+1, len(key))
+	assert.Equal(t, byte(DeduplicatorCache), key[0])
+
+	expectedKey = append([]byte{byte(DeduplicatorCache)}, data1...)
+
+	assert.Equal(t, expectedKey, key)
+
+	key = Key(DeduplicatorCache, data2)
+	assert.Equal(t, len(data2)+1, len(key))
+	assert.Equal(t, byte(DeduplicatorCache), key[0])
+
+	expectedKey = append([]byte{byte(DeduplicatorCache)}, data2...)
+
+	assert.Equal(t, expectedKey, key)
+}

geth/node/status_node.go

@@ -22,6 +22,7 @@ import (
 	"github.com/status-im/status-go/geth/params"
 	"github.com/status-im/status-go/geth/peers"
 	"github.com/status-im/status-go/geth/rpc"
+	"github.com/status-im/status-go/services/shhext"
 )
 
 // tickerResolution is the delta to check blockchain sync progress.
@@ -98,6 +99,17 @@ func (n *StatusNode) Start(config *params.NodeConfig, services ...node.ServiceCo
 		return err
 	}
 
+	statusDB, err := db.Create(n.config.DataDir, params.StatusDatabase)
+	if err != nil {
+		return err
+	}
+
+	n.db = statusDB
+
+	if err := n.setupDeduplicator(); err != nil {
+		return err
+	}
+
 	if n.config.Discovery {
 		return n.startPeerPool()
 	}
@@ -105,6 +117,20 @@ func (n *StatusNode) Start(config *params.NodeConfig, services ...node.ServiceCo
 	return nil
 }
 
+func (n *StatusNode) setupDeduplicator() error {
+	var s shhext.Service
+
+	err := n.gethService(&s)
+	if err == node.ErrServiceUnknown {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	return s.Deduplicator.Start(n.db)
+}
+
 func (n *StatusNode) createNode(config *params.NodeConfig) (err error) {
 	n.gethNode, err = MakeNode(config)
 	return
@@ -143,11 +169,6 @@ func (n *StatusNode) setupRPCClient() (err error) {
 }
 
 func (n *StatusNode) startPeerPool() error {
-	statusDB, err := db.Create(filepath.Join(n.config.DataDir, params.StatusDatabase))
-	if err != nil {
-		return err
-	}
-	n.db = statusDB
 	n.register = peers.NewRegister(n.config.RegisterTopics...)
 	// TODO(dshulyak) consider adding a flag to define this behaviour
 	stopOnMax := len(n.config.RegisterTopics) == 0
@@ -182,7 +203,6 @@ func (n *StatusNode) stop() error {
 	}
 	n.register = nil
 	n.peerPool = nil
-	n.db = nil
 
 	if err := n.gethNode.Stop(); err != nil {
 		return err
@@ -195,6 +215,11 @@ func (n *StatusNode) stop() error {
 	n.gethNode = nil
 	n.config = nil
 
+	if err := n.db.Close(); err != nil {
+		return err
+	}
+	n.db = nil
+
 	return nil
 }
 
@@ -205,7 +230,7 @@ func (n *StatusNode) stopPeerPool() error {
 
 	n.register.Stop()
 	n.peerPool.Stop()
-	return n.db.Close()
+	return nil
 }
 
 // ResetChainData removes chain data if node is not running.

geth/peers/cache.go

@@ -3,6 +3,7 @@ package peers
 import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/discv5"
+	"github.com/status-im/status-go/geth/db"
 	"github.com/syndtr/goleveldb/leveldb"
 	"github.com/syndtr/goleveldb/leveldb/util"
 )
@@ -18,12 +19,7 @@ type Cache struct {
 }
 
 func makePeerKey(peerID discv5.NodeID, topic discv5.Topic) []byte {
-	topicLen := len([]byte(topic))
-	lth := topicLen + len(peerID)
-	key := make([]byte, lth)
-	copy(key[:], topic[:])
-	copy(key[topicLen:], peerID[:])
-	return key
+	return db.Key(db.PeersCache, []byte(topic), peerID[:])
 }
 
 // AddPeer stores peer with a following key: <topic><peer ID>
@@ -42,9 +38,7 @@ func (d *Cache) RemovePeer(peerID discv5.NodeID, topic discv5.Topic) error {
 
 // GetPeersRange returns peers for a given topic with a limit.
 func (d *Cache) GetPeersRange(topic discv5.Topic, limit int) (nodes []*discv5.Node) {
-	topicLen := len([]byte(topic))
-	key := make([]byte, topicLen)
-	copy(key[:], []byte(topic))
+	key := db.Key(db.PeersCache, []byte(topic))
 	iterator := d.db.NewIterator(&util.Range{Start: key}, nil)
 	defer iterator.Release()
 	count := 0

geth/peers/cache_test.go

@@ -1,9 +1,7 @@
 package peers
 
 import (
-	"io/ioutil"
 	"net"
-	"os"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/p2p/discv5"
@@ -13,12 +11,7 @@ import (
 )
 
 func TestPeersRange(t *testing.T) {
-	path, err := ioutil.TempDir("/tmp", "status-peers-test-")
-	require.NoError(t, err)
-	defer func() {
-		require.NoError(t, os.RemoveAll(path))
-	}()
-	rootDB, err := db.Create(path)
+	rootDB, err := db.Create("", "status-peers-test")
 	require.NoError(t, err)
 	defer func() {
 		assert.NoError(t, rootDB.Close())

services/shhext/api.go

@@ -121,6 +121,15 @@ func (api *PublicAPI) RequestMessages(_ context.Context, r MessagesRequest) (boo
 	return true, nil
 }
 
+// GetNewFilterMessages is a prototype method with deduplication
+func (api *PublicAPI) GetNewFilterMessages(filterID string) ([]*whisper.Message, error) {
+	msgs, err := api.publicAPI.GetFilterMessages(filterID)
+	if err != nil {
+		return nil, err
+	}
+	return api.service.Deduplicator.Deduplicate(msgs), err
+}
+
 // -----
 // HELPER
 // -----
@@ -151,5 +160,4 @@ func makePayload(r MessagesRequest) []byte {
 	binary.BigEndian.PutUint32(data[4:], r.To)
 	copy(data[8:], whisper.TopicToBloom(r.Topic))
 	return data
-
 }

services/shhext/dedup/cache.go

@@ -0,0 +1,110 @@
+package dedup
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto/sha3"
+	whisper "github.com/ethereum/go-ethereum/whisper/whisperv6"
+	"github.com/status-im/status-go/geth/db"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+// cache represents a cache of whisper messages with a limit of 2 days.
+// the limit is counted from the time when the message was added to the cache.
+type cache struct {
+	db  *leveldb.DB
+	now func() time.Time
+}
+
+func newCache(db *leveldb.DB) *cache {
+	return &cache{db, time.Now}
+}
+
+func (d *cache) Has(filterID string, message *whisper.Message) (bool, error) {
+	has, err := d.db.Has(d.keyToday(filterID, message), nil)
+
+	if err != nil {
+		return false, err
+	}
+	if has {
+		return true, nil
+	}
+
+	return d.db.Has(d.keyYesterday(filterID, message), nil)
+}
+
+func (d *cache) Put(filterID string, messages []*whisper.Message) error {
+	batch := leveldb.Batch{}
+
+	for _, msg := range messages {
+		batch.Put(d.keyToday(filterID, msg), []byte{})
+	}
+
+	err := d.db.Write(&batch, nil)
+	if err != nil {
+		return err
+	}
+
+	return d.cleanOldEntries()
+}
+
+func (d *cache) cleanOldEntries() error {
+	// Cleaning up everything that is older than 2 days
+	// We are using the fact that leveldb can do prefix queries and that
+	// the entries are sorted by keys.
+	// Here, we are looking for all the keys that are between
+	// 00000000.* and <yesterday's date>.*
+	// e.g. (0000000.* -> 20180424.*)
+
+	limit := d.yesterdayDateString()
+
+	r := &util.Range{
+		Start: db.Key(db.DeduplicatorCache, []byte("00000000")),
+		Limit: db.Key(db.DeduplicatorCache, []byte(limit)),
+	}
+
+	batch := leveldb.Batch{}
+	iter := d.db.NewIterator(r, nil)
+	for iter.Next() {
+		batch.Delete(iter.Key())
+	}
+	iter.Release()
+
+	return d.db.Write(&batch, nil)
+}
+
+func (d *cache) keyYesterday(filterID string, message *whisper.Message) []byte {
+	return prefixedKey(d.yesterdayDateString(), filterID, message)
+}
+
+func (d *cache) keyToday(filterID string, message *whisper.Message) []byte {
+	return prefixedKey(d.todayDateString(), filterID, message)
+}
+
+func (d *cache) todayDateString() string {
+	return dateString(d.now())
+}
+
+func (d *cache) yesterdayDateString() string {
+	now := d.now()
+	yesterday := now.Add(-24 * time.Hour)
+	return dateString(yesterday)
+}
+
+func dateString(t time.Time) string {
+	// Layouts must use the reference time Mon Jan 2 15:04:05 MST 2006
+	return t.Format("20060102")
+}
+
+func prefixedKey(date, filterID string, message *whisper.Message) []byte {
+	return db.Key(db.DeduplicatorCache, []byte(date), []byte(filterID), key(message))
+}
+
+func key(message *whisper.Message) []byte {
+	data := make([]byte, len(message.Payload)+len(message.Topic))
+	copy(data[:], message.Payload)
+	copy(data[len(message.Payload):], message.Topic[:])
+	digest := sha3.Sum512(data)
+	return digest[:]
+}

services/shhext/dedup/cache_test.go

@@ -0,0 +1,128 @@
+package dedup
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+)
+
+func TestDedupCacheTestSuite(t *testing.T) {
+	suite.Run(t, new(DedupCacheTestSuite))
+}
+
+type DedupCacheTestSuite struct {
+	suite.Suite
+	c  *cache
+	db *leveldb.DB
+}
+
+func (s *DedupCacheTestSuite) SetupTest() {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
+
+	if err != nil {
+		panic(err)
+	}
+	s.db = db
+
+	s.c = newCache(db)
+}
+
+func (s *DedupCacheTestSuite) TearDownTest() {
+	s.NoError(s.db.Close())
+}
+
+func (s *DedupCacheTestSuite) TestMultipleFilterIDs() {
+	filterID1 := "filter-id1"
+	filterID2 := "filter-id2"
+	filterID3 := "filter-id"
+	messagesFilter1 := generateMessages(10)
+	s.NoError(s.c.Put(filterID1, messagesFilter1))
+
+	for _, msg := range messagesFilter1 {
+		has, err := s.c.Has(filterID1, msg)
+		s.NoError(err)
+		s.True(has)
+
+		has, err = s.c.Has(filterID2, msg)
+		s.NoError(err)
+		s.False(has)
+
+		has, err = s.c.Has(filterID3, msg)
+		s.NoError(err)
+		s.False(has)
+	}
+
+	messagesFilter2 := generateMessages(10)
+	s.NoError(s.c.Put(filterID2, messagesFilter2))
+
+	for _, msg := range messagesFilter2 {
+		has, err := s.c.Has(filterID1, msg)
+		s.NoError(err)
+		s.False(has)
+
+		has, err = s.c.Has(filterID2, msg)
+		s.NoError(err)
+		s.True(has)
+
+		has, err = s.c.Has(filterID3, msg)
+		s.NoError(err)
+		s.False(has)
+	}
+}
+
+func (s *DedupCacheTestSuite) TestCleaningUp() {
+	filterID := "filter-id"
+	// - 2 days
+	s.c.now = func() time.Time { return time.Now().Add(-48 * time.Hour) }
+	messages2DaysOld := generateMessages(10)
+	s.NoError(s.c.Put(filterID, messages2DaysOld))
+
+	for _, msg := range messages2DaysOld {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.True(has)
+	}
+
+	// - 1 days
+	s.c.now = func() time.Time { return time.Now().Add(-24 * time.Hour) }
+	messages1DayOld := generateMessages(10)
+	s.NoError(s.c.Put(filterID, messages1DayOld))
+
+	for _, msg := range messages2DaysOld {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.True(has)
+	}
+
+	for _, msg := range messages1DayOld {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.True(has)
+	}
+
+	// now
+	s.c.now = time.Now
+	messagesToday := generateMessages(10)
+	s.NoError(s.c.Put(filterID, messagesToday))
+
+	for _, msg := range messages2DaysOld {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.False(has)
+	}
+
+	for _, msg := range messages1DayOld {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.True(has)
+	}
+
+	for _, msg := range messagesToday {
+		has, err := s.c.Has(filterID, msg)
+		s.NoError(err)
+		s.True(has)
+	}
+}

services/shhext/dedup/deduplicator.go

@@ -0,0 +1,63 @@
+package dedup
+
+import (
+	"github.com/ethereum/go-ethereum/log"
+	whisper "github.com/ethereum/go-ethereum/whisper/whisperv6"
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+type keyPairProvider interface {
+	SelectedKeyPairID() string
+}
+
+// Deduplicator filters out already received messages for a current filter.
+// It keeps a limited cache of the messages.
+type Deduplicator struct {
+	keyPairProvider keyPairProvider
+	cache           *cache
+	log             log.Logger
+}
+
+// NewDeduplicator creates a new deduplicator
+func NewDeduplicator(keyPairProvider keyPairProvider) *Deduplicator {
+	return &Deduplicator{
+		log:             log.New("package", "status-go/services/sshext.deduplicator"),
+		keyPairProvider: keyPairProvider,
+	}
+}
+
+// Start enabled deduplication.
+func (d *Deduplicator) Start(db *leveldb.DB) error {
+	d.cache = newCache(db)
+	return nil
+}
+
+// Deduplicate receives a list of whisper messages and
+// returns the list of the messages that weren't filtered previously for the
+// specified filter.
+func (d *Deduplicator) Deduplicate(messages []*whisper.Message) []*whisper.Message {
+	if d.cache == nil {
+		d.log.Info("Deduplication wasn't started. Returning all the messages.")
+		return messages
+	}
+	result := make([]*whisper.Message, 0)
+
+	for _, message := range messages {
+		if has, err := d.cache.Has(d.keyPairProvider.SelectedKeyPairID(), message); !has {
+			if err != nil {
+				d.log.Error("error while deduplicating messages: search cache failed", "err", err)
+			}
+			result = append(result, message)
+		}
+	}
+
+	// Put all the messages there, for simplicity.
+	// That way, we will always have repeating messages in the current day.
+	// Performance implications seem negligible on 30000 messages/day
+	err := d.cache.Put(d.keyPairProvider.SelectedKeyPairID(), messages)
+	if err != nil {
+		d.log.Error("error while deduplicating messages: cache update failed", "err", err)
+	}
+
+	return result
+}

services/shhext/dedup/deduplicator_test.go

@@ -0,0 +1,128 @@
+package dedup
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+)
+
+type dummyKeyPairProvider struct {
+	id string
+}
+
+func (p dummyKeyPairProvider) SelectedKeyPairID() string {
+	return p.id
+}
+
+func BenchmarkDeduplicate30000MessagesADay(b *testing.B) {
+	// using on-disk db here for real benchmarks
+	dir, err := ioutil.TempDir("", "dedup-30000")
+	if err != nil {
+		panic(err)
+	}
+
+	defer func() {
+		err := os.RemoveAll(dir)
+		if err != nil {
+			panic(err)
+		}
+	}()
+
+	db, err := leveldb.OpenFile(dir, nil)
+	if err != nil {
+		panic(err)
+	}
+
+	d := NewDeduplicator(dummyKeyPairProvider{})
+	if err := d.Start(db); err != nil {
+		panic(err)
+	}
+
+	b.Log("generating messages")
+	messagesOld := generateMessages(100000)
+	b.Log("generation is done")
+
+	// pre-fill deduplicator
+	d.Deduplicate(messagesOld[:1000])
+
+	b.ResetTimer()
+	length := 300
+	start := 1000
+	for n := 0; n < b.N; n++ {
+		if n%100 == 0 {
+			d.cache.now = func() time.Time { return time.Now().Add(time.Duration(24*(n/100)) * time.Hour) }
+		}
+		if (start + length) >= len(messagesOld) {
+			start = 0
+			fmt.Println("cycle!")
+		}
+		messages := messagesOld[start:(start + length)]
+		start += length
+		d.Deduplicate(messages)
+	}
+}
+
+func TestDeduplicatorTestSuite(t *testing.T) {
+	suite.Run(t, new(DeduplicatorTestSuite))
+}
+
+type DeduplicatorTestSuite struct {
+	suite.Suite
+	d  *Deduplicator
+	db *leveldb.DB
+}
+
+func (s *DeduplicatorTestSuite) SetupTest() {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
+	if err != nil {
+		panic(err)
+	}
+	s.db = db
+	s.d = NewDeduplicator(dummyKeyPairProvider{})
+	s.NoError(s.d.Start(db))
+}
+
+func (s *DeduplicatorTestSuite) TearDownTest() {
+	s.NoError(s.db.Close())
+}
+
+func (s *DeduplicatorTestSuite) TestDeduplicateSingleFilter() {
+	s.d.keyPairProvider = dummyKeyPairProvider{"acc1"}
+	messages1 := generateMessages(10)
+	messages2 := generateMessages(12)
+
+	result := s.d.Deduplicate(messages1)
+	s.Equal(len(messages1), len(result))
+
+	result = s.d.Deduplicate(messages1)
+	s.Equal(0, len(result))
+
+	result = s.d.Deduplicate(messages2)
+	s.Equal(len(messages2), len(result))
+
+	messages3 := append(messages2, generateMessages(11)...)
+
+	result = s.d.Deduplicate(messages3)
+	s.Equal(11, len(result))
+}
+
+func (s *DeduplicatorTestSuite) TestDeduplicateMultipleFilters() {
+	messages1 := generateMessages(10)
+
+	s.d.keyPairProvider = dummyKeyPairProvider{"acc1"}
+	result := s.d.Deduplicate(messages1)
+	s.Equal(len(messages1), len(result))
+
+	result = s.d.Deduplicate(messages1)
+	s.Equal(0, len(result))
+
+	s.d.keyPairProvider = dummyKeyPairProvider{"acc2"}
+	result = s.d.Deduplicate(messages1)
+	s.Equal(len(messages1), len(result))
+}

services/shhext/dedup/utils_test.go

@@ -0,0 +1,26 @@
+package dedup
+
+import (
+	"crypto/rand"
+
+	whisper "github.com/ethereum/go-ethereum/whisper/whisperv6"
+)
+
+func generateMessages(count int) []*whisper.Message {
+	result := []*whisper.Message{}
+	for ; count > 0; count-- {
+		content := mustGenerateRandomBytes()
+		result = append(result, &whisper.Message{Payload: content})
+	}
+	return result
+}
+
+func mustGenerateRandomBytes() []byte {
+	c := 2048
+	b := make([]byte, c)
+	_, err := rand.Read(b)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}

services/shhext/service.go

@@ -10,6 +10,7 @@ import (
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/rpc"
 	whisper "github.com/ethereum/go-ethereum/whisper/whisperv6"
+	"github.com/status-im/status-go/services/shhext/dedup"
 )
 
 // EnvelopeState in local tracker
@@ -33,6 +34,7 @@ type Service struct {
 	w            *whisper.Whisper
 	tracker      *tracker
 	nodeID       *ecdsa.PrivateKey
+	Deduplicator *dedup.Deduplicator
 }
 
 // Make sure that Service implements node.Service interface.
@@ -48,6 +50,7 @@ func New(w *whisper.Whisper, handler EnvelopeEventsHandler) *Service {
 	return &Service{
 		w:            w,
 		tracker:      track,
+		Deduplicator: dedup.NewDeduplicator(w),
 	}
 }
 

vendor/github.com/ethereum/go-ethereum/whisper/whisperv6/whisper.go

@@ -1177,3 +1177,15 @@ func addBloom(a, b []byte) []byte {
 	}
 	return c
 }
+
+// SelectedKeyPairID returns the id of currently selected key pair.
+// It helps distinguish between different users w/o exposing the user identity itself.
+func (whisper *Whisper) SelectedKeyPairID() string {
+	whisper.keyMu.RLock()
+	defer whisper.keyMu.RUnlock()
+
+	for id := range whisper.privateKeys {
+		return id
+	}
+	return ""
+}