Request info about community from mailserver (#2177)

VERSION

@@ -1 +1 @@
-0.76.2
+0.76.3

go.mod

@@ -54,10 +54,12 @@ require (
 	github.com/pborman/uuid v1.2.0
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.5.0
+	github.com/prometheus/common v0.9.1
 	github.com/russolsen/ohyeah v0.0.0-20160324131710-f4938c005315 // indirect
 	github.com/russolsen/same v0.0.0-20160222130632-f089df61f51d // indirect
 	github.com/russolsen/transit v0.0.0-20180705123435-0794b4c4505a
 	github.com/status-im/doubleratchet v3.0.0+incompatible
+	github.com/status-im/go-ethereum v1.9.1 // indirect
 	github.com/status-im/keycard-go v0.0.0-20200107115650-f38e9a19958e // indirect
 	github.com/status-im/markdown v0.0.0-20201022101546-c0cbdd5763bf
 	github.com/status-im/migrate/v4 v4.6.2-status.2

go.sum

@@ -647,6 +647,8 @@ github.com/spf13/viper v1.3.2/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DM
 github.com/src-d/envconfig v1.0.0/go.mod h1:Q9YQZ7BKITldTBnoxsE5gOeB5y66RyPXeue/R4aaNBc=
 github.com/status-im/doubleratchet v3.0.0+incompatible h1:aJ1ejcSERpSzmWZBgtfYtiU2nF0Q8ZkGyuEPYETXkCY=
 github.com/status-im/doubleratchet v3.0.0+incompatible/go.mod h1:1sqR0+yhiM/bd+wrdX79AOt2csZuJOni0nUDzKNuqOU=
+github.com/status-im/go-ethereum v1.9.1 h1:N3E3g++Isr4OORPVPwWFlaHp+3EOV9X4A88MbcRsk2Y=
+github.com/status-im/go-ethereum v1.9.1/go.mod h1:rdSZTVW2L1V6dsRpW77o4gwqWRUYfb/e9nNHcIgVEO4=
 github.com/status-im/go-ethereum v1.9.5-status.10 h1:QAPL3CMm84nHQG08wfra3HpLUehk+DxaQYMAfda0BzY=
 github.com/status-im/go-ethereum v1.9.5-status.10/go.mod h1:YyH5DKB6+z+Vaya7eIm67pnuPZ1oiUMbbsZW41ktN0g=
 github.com/status-im/go-multiaddr-ethv4 v1.2.0 h1:OT84UsUzTCwguqCpJqkrCMiL4VZ1SvUtH9a5MsZupBk=
@@ -763,6 +765,7 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20191119213627-4f8c1d86b1ba/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c h1:/nJuwDLoL/zrqY6gf57vxC+Pi+pZ8bfhpPkicO5H7W4=
 golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 h1:/ZScEX8SfEmUGRHs0gxpqteO5nfNW6axyZbBdw9A12g=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/image v0.0.0-20200927104501-e162460cd6b5 h1:QelT11PB4FXiDEXucrfNckHoFxwt8USGY1ajP1ZF5lM=
 golang.org/x/image v0.0.0-20200927104501-e162460cd6b5/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=

protocol/communities/community.go

@@ -133,7 +133,32 @@ func (o *Community) MarshalJSON() ([]byte, error) {
 }
 
 func (o *Community) Name() string {
-	return o.config.CommunityDescription.Identity.DisplayName
+	if o != nil &&
+		o.config != nil &&
+		o.config.CommunityDescription != nil &&
+		o.config.CommunityDescription.Identity != nil {
+		return o.config.CommunityDescription.Identity.DisplayName
+	}
+	return ""
+}
+
+func (o *Community) Description() string {
+	if o != nil &&
+		o.config != nil &&
+		o.config.CommunityDescription != nil &&
+		o.config.CommunityDescription.Identity != nil {
+		return o.config.CommunityDescription.Identity.Description
+	}
+	return ""
+}
+
+func (o *Community) MembersCount() int {
+	if o != nil &&
+		o.config != nil &&
+		o.config.CommunityDescription != nil {
+		return len(o.config.CommunityDescription.Members)
+	}
+	return 0
 }
 
 func (o *Community) initialize() {

protocol/messenger.go

@@ -105,6 +105,7 @@ type Messenger struct {
 	account                    *multiaccounts.Account
 	mailserversDatabase        *mailservers.Database
 	quit                       chan struct{}
+	requestedCommunities       map[string]*transport.Filter
 
 	// TODO(samyoul) Determine if/how the remaining usage of this mutex can be removed
 	mutex sync.Mutex
@@ -313,6 +314,7 @@ func NewMessenger(
 		mailserversDatabase:        c.mailserversDatabase,
 		account:                    c.account,
 		quit:                       make(chan struct{}),
+		requestedCommunities:       make(map[string]*transport.Filter),
 		shutdownTasks: []func() error{
 			ensVerifier.Stop,
 			pushNotificationClient.Stop,
@@ -2403,13 +2405,13 @@ func (m *Messenger) markDeliveredMessages(acks [][]byte) {
 		}
 
 		//send signal to client that message status updated
-		if m.config.messageDeliveredHandler != nil {
+		if m.config.messengerSignalsHandler != nil {
 			message, err := m.persistence.MessageByID(messageID)
 			if err != nil {
 				m.logger.Debug("Can't get message from database", zap.Error(err))
 				continue
 			}
-			m.config.messageDeliveredHandler(message.LocalChatID, messageID)
+			m.config.messengerSignalsHandler.MessageDelivered(message.LocalChatID, messageID)
 		}
 	}
 }
@@ -2795,6 +2797,14 @@ func (m *Messenger) handleRetrievedMessages(chatWithMessages map[transport.Filte
 							allMessagesProcessed = false
 							continue
 						}
+
+						//if community was among requested ones, send its info and remove filter
+						for communityID := range m.requestedCommunities {
+							if _, ok := messageState.Response.communities[communityID]; ok {
+								m.passStoredCommunityInfoToSignalHandler(communityID)
+							}
+						}
+
 					case protobuf.CommunityInvitation:
 						logger.Debug("Handling CommunityInvitation")
 						invitation := msg.ParsedMessage.Interface().(protobuf.CommunityInvitation)
@@ -3008,11 +3018,26 @@ func (m *Messenger) RequestHistoricMessages(
 	ctx context.Context,
 	from, to uint32,
 	cursor []byte,
+	waitForResponse bool,
 ) ([]byte, error) {
 	if m.mailserver == nil {
 		return nil, errors.New("no mailserver selected")
 	}
-	return m.transport.SendMessagesRequest(ctx, m.mailserver, from, to, cursor)
+	return m.transport.SendMessagesRequest(ctx, m.mailserver, from, to, cursor, waitForResponse)
+}
+
+func (m *Messenger) RequestHistoricMessagesForFilter(
+	ctx context.Context,
+	from, to uint32,
+	cursor []byte,
+	filter *transport.Filter,
+	waitForResponse bool,
+) ([]byte, error) {
+	if m.mailserver == nil {
+		return nil, errors.New("no mailserver selected")
+	}
+
+	return m.transport.SendMessagesRequestForFilter(ctx, m.mailserver, from, to, cursor, filter, waitForResponse)
 }
 
 func (m *Messenger) LoadFilters(filters []*transport.Filter) ([]*transport.Filter, error) {

protocol/messenger_communities.go

@@ -3,6 +3,7 @@ package protocol
 import (
 	"context"
 	"crypto/ecdsa"
+	"fmt"
 	"time"
 
 	"github.com/golang/protobuf/proto"
@@ -14,6 +15,7 @@ import (
 	"github.com/status-im/status-go/protocol/communities"
 	"github.com/status-im/status-go/protocol/protobuf"
 	"github.com/status-im/status-go/protocol/requests"
+	"github.com/status-im/status-go/protocol/transport"
 )
 
 const communityInvitationText = "Upgrade to see a community invitation"
@@ -371,6 +373,10 @@ func (m *Messenger) ImportCommunity(key *ecdsa.PrivateKey) (*MessengerResponse,
 		return nil, err
 	}
 
+	//request info already stored on mailserver, but its success is not crucial
+	// for import
+	_ = m.RequestCommunityInfoFromMailserver(org.IDString())
+
 	return &MessengerResponse{
 		Filters: filters,
 	}, nil
@@ -493,3 +499,97 @@ func (m *Messenger) BanUserFromCommunity(request *requests.BanUserFromCommunity)
 	response.AddCommunity(community)
 	return response, nil
 }
+
+// RequestCommunityInfoFromMailserver installs filter for community and requests its details
+// from mailserver. When response received it will be passed through signals handler
+func (m *Messenger) RequestCommunityInfoFromMailserver(communityID string) error {
+
+	if _, ok := m.requestedCommunities[communityID]; ok {
+		return nil
+	}
+
+	//If filter wasn't installed we create it and remember for deinstalling after
+	//response received
+	filter := m.transport.FilterByChatID(communityID)
+	if filter == nil {
+		filters, err := m.transport.InitPublicFilters([]string{communityID})
+		if err != nil {
+			return fmt.Errorf("Can't install filter for community: %v", err)
+		}
+		if len(filters) != 1 {
+			return fmt.Errorf("Unexpected amount of filters created")
+		}
+		filter = filters[0]
+		m.requestedCommunities[communityID] = filter
+	} else {
+		//we don't remember filter id associated with community because it was already installed
+		m.requestedCommunities[communityID] = nil
+	}
+
+	now := uint32(m.transport.GetCurrentTime() / 1000)
+	monthAgo := now - (86400 * 30)
+
+	_, err := m.RequestHistoricMessagesForFilter(context.Background(),
+		monthAgo,
+		now,
+		nil,
+		filter,
+		false)
+
+	//It is possible that we already processed last existing message for community
+	//and won't get any updates, so send stored info in this case after timeout
+	go func() {
+		time.Sleep(15 * time.Second)
+		m.mutex.Lock()
+		defer m.mutex.Unlock()
+
+		if _, ok := m.requestedCommunities[communityID]; ok {
+			m.passStoredCommunityInfoToSignalHandler(communityID)
+		}
+	}()
+
+	return err
+}
+
+// forgetCommunityRequest removes community from requested ones and removes filter
+func (m *Messenger) forgetCommunityRequest(communityID string) {
+	filter, ok := m.requestedCommunities[communityID]
+	if !ok {
+		return
+	}
+
+	if filter != nil {
+		err := m.transport.RemoveFilters([]*transport.Filter{filter})
+		if err != nil {
+			m.logger.Warn("cant remove filter", zap.Error(err))
+		}
+	}
+
+	delete(m.requestedCommunities, communityID)
+}
+
+// passStoredCommunityInfoToSignalHandler calls signal handler with community info
+func (m *Messenger) passStoredCommunityInfoToSignalHandler(communityID string) {
+	if m.config.messengerSignalsHandler == nil {
+		return
+	}
+
+	//send signal to client that message status updated
+	community, err := m.communitiesManager.GetByIDString(communityID)
+	if community == nil {
+		return
+	}
+
+	//if there is no info helpful for client, we don't post it
+	if community.Name() == "" && community.Description() == "" && community.MembersCount() == 0 {
+		return
+	}
+
+	if err != nil {
+		m.logger.Warn("cant get community and pass it to signal handler", zap.Error(err))
+		return
+	}
+
+	m.config.messengerSignalsHandler.CommunityInfoFound(community)
+	m.forgetCommunityRequest(communityID)
+}

protocol/messenger_config.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/status-im/status-go/multiaccounts"
 	"github.com/status-im/status-go/protocol/common"
+	"github.com/status-im/status-go/protocol/communities"
 	"github.com/status-im/status-go/protocol/protobuf"
 	"github.com/status-im/status-go/protocol/pushnotificationclient"
 	"github.com/status-im/status-go/protocol/pushnotificationserver"
@@ -16,6 +17,11 @@ import (
 
 type MessageDeliveredHandler func(string, string)
 
+type MessengerSignalsHandler interface {
+	MessageDelivered(chatID string, messageID string)
+	CommunityInfoFound(community *communities.Community)
+}
+
 type config struct {
 	// This needs to be exposed until we move here mailserver logic
 	// as otherwise the client is not notified of a new filter and
@@ -47,7 +53,7 @@ type config struct {
 
 	logger *zap.Logger
 
-	messageDeliveredHandler MessageDeliveredHandler
+	messengerSignalsHandler MessengerSignalsHandler
 }
 
 type Option func(*config) error
@@ -152,9 +158,9 @@ func WithEnvelopesMonitorConfig(emc *transport.EnvelopesMonitorConfig) Option {
 	}
 }
 
-func WithDeliveredHandler(h MessageDeliveredHandler) Option {
+func WithSignalsHandler(h MessengerSignalsHandler) Option {
 	return func(c *config) error {
-		c.messageDeliveredHandler = h
+		c.messengerSignalsHandler = h
 		return nil
 	}
 }

protocol/messenger_test.go

@@ -2207,7 +2207,7 @@ func (s *MessengerSuite) TestRequestHistoricMessagesRequest() {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
 	defer cancel()
 	m.mailserver = []byte("mailserver-id")
-	cursor, err := m.RequestHistoricMessages(ctx, 10, 20, []byte{0x01})
+	cursor, err := m.RequestHistoricMessages(ctx, 10, 20, []byte{0x01}, true)
 	s.EqualError(err, ctx.Err().Error())
 	s.Empty(cursor)
 	// verify request is correct

protocol/transport/filters_manager.go

@@ -225,6 +225,14 @@ func (s *FiltersManager) FilterByFilterID(filterID string) *Filter {
 	return nil
 }
 
+// FilterByChatID returns a Filter for given chat id
+func (s *FiltersManager) FilterByChatID(chatID string) *Filter {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	return s.filters[chatID]
+}
+
 func (s *FiltersManager) FiltersByPublicKey(publicKey *ecdsa.PublicKey) (result []*Filter) {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()

protocol/transport/transport.go

@@ -30,8 +30,19 @@ type Transport interface {
 		peerID []byte,
 		from, to uint32,
 		previousCursor []byte,
+		waitForResponse bool,
 	) (cursor []byte, err error)
 
+	SendMessagesRequestForFilter(
+		ctx context.Context,
+		peerID []byte,
+		from, to uint32,
+		previousCursor []byte,
+		filter *Filter,
+		waitForResponse bool,
+	) (cursor []byte, err error)
+	FilterByChatID(string) *Filter
+
 	Track(identifiers [][]byte, hash []byte, newMessage *types.NewMessage)
 
 	InitFilters(chatIDs []string, publicKeys []*ecdsa.PublicKey) ([]*Filter, error)

protocol/transport/waku/waku_service.go

@@ -141,6 +141,10 @@ func (a *Transport) Filters() []*transport.Filter {
 	return a.filters.Filters()
 }
 
+func (a *Transport) FilterByChatID(chatID string) *transport.Filter {
+	return a.filters.FilterByChatID(chatID)
+}
+
 func (a *Transport) LoadFilters(filters []*transport.Filter) ([]*transport.Filter, error) {
 	return a.filters.InitWithFilters(filters)
 }
@@ -410,17 +414,14 @@ func (a *Transport) cleanFiltersLoop() {
 	}()
 }
 
-// RequestHistoricMessages requests historic messages for all registered filters.
-func (a *Transport) SendMessagesRequest(
+func (a *Transport) sendMessagesRequestForTopics(
 	ctx context.Context,
 	peerID []byte,
 	from, to uint32,
 	previousCursor []byte,
+	topics []types.TopicType,
+	waitForResponse bool,
 ) (cursor []byte, err error) {
-	topics := make([]types.TopicType, len(a.Filters()))
-	for _, f := range a.Filters() {
-		topics = append(topics, f.Topic)
-	}
 
 	r := createMessagesRequest(from, to, previousCursor, topics)
 	r.SetDefaults(a.waku.GetCurrentTime())
@@ -434,6 +435,10 @@ func (a *Transport) SendMessagesRequest(
 		return
 	}
 
+	if !waitForResponse {
+		return
+	}
+
 	resp, err := a.waitForRequestCompleted(ctx, r.ID, events)
 	if err == nil && resp != nil && resp.Error != nil {
 		err = resp.Error
@@ -443,15 +448,42 @@ func (a *Transport) SendMessagesRequest(
 	return
 }
 
+// RequestHistoricMessages requests historic messages for all registered filters.
+func (a *Transport) SendMessagesRequest(
+	ctx context.Context,
+	peerID []byte,
+	from, to uint32,
+	previousCursor []byte,
+	waitForResponse bool,
+) (cursor []byte, err error) {
+
+	topics := make([]types.TopicType, len(a.Filters()))
+	for _, f := range a.Filters() {
+		topics = append(topics, f.Topic)
+	}
+
+	return a.sendMessagesRequestForTopics(ctx, peerID, from, to, previousCursor, topics, waitForResponse)
+}
+
+func (a *Transport) SendMessagesRequestForFilter(
+	ctx context.Context,
+	peerID []byte,
+	from, to uint32,
+	previousCursor []byte,
+	filter *transport.Filter,
+	waitForResponse bool,
+) (cursor []byte, err error) {
+
+	topics := make([]types.TopicType, len(a.Filters()))
+	topics = append(topics, filter.Topic)
+
+	return a.sendMessagesRequestForTopics(ctx, peerID, from, to, previousCursor, topics, waitForResponse)
+}
+
 func (a *Transport) waitForRequestCompleted(ctx context.Context, requestID []byte, events chan types.EnvelopeEvent) (*types.MailServerResponse, error) {
 	for {
 		select {
 		case ev := <-events:
-			a.logger.Debug(
-				"waiting for request completed and received an event",
-				zap.Binary("requestID", requestID),
-				zap.Any("event", ev),
-			)
 			if !bytes.Equal(ev.Hash.Bytes(), requestID) {
 				continue
 			}

protocol/transport/whisper/whisper_service.go

@@ -139,6 +139,10 @@ func (a *Transport) Filters() []*transport.Filter {
 	return a.filters.Filters()
 }
 
+func (a *Transport) FilterByChatID(chatID string) *transport.Filter {
+	return a.filters.FilterByChatID(chatID)
+}
+
 func (a *Transport) LoadFilters(filters []*transport.Filter) ([]*transport.Filter, error) {
 	return a.filters.InitWithFilters(filters)
 }
@@ -418,6 +422,7 @@ func (a *Transport) SendMessagesRequest(
 	peerID []byte,
 	from, to uint32,
 	previousCursor []byte,
+	waitForResponse bool,
 ) (cursor []byte, err error) {
 	topics := make([]types.TopicType, len(a.Filters()))
 	for _, f := range a.Filters() {
@@ -436,6 +441,10 @@ func (a *Transport) SendMessagesRequest(
 		return
 	}
 
+	if !waitForResponse {
+		return
+	}
+
 	resp, err := a.waitForRequestCompleted(ctx, r.ID, events)
 	if err == nil && resp != nil && resp.Error != nil {
 		err = resp.Error
@@ -445,6 +454,18 @@ func (a *Transport) SendMessagesRequest(
 	return
 }
 
+//TODO: kozieiev: fix
+func (a *Transport) SendMessagesRequestForFilter(
+	ctx context.Context,
+	peerID []byte,
+	from, to uint32,
+	previousCursor []byte,
+	filter *transport.Filter,
+	waitForResponse bool,
+) (cursor []byte, err error) {
+	return nil, nil
+}
+
 func (a *Transport) LoadKeyFilters(key *ecdsa.PrivateKey) (*transport.Filter, error) {
 	return a.filters.LoadPartitioned(&key.PublicKey, key, true)
 }

services/ext/api.go

@@ -700,6 +700,10 @@ func (api *PublicAPI) EnsVerified(pk, ensName string) error {
 	return api.service.messenger.ENSVerified(pk, ensName)
 }
 
+func (api *PublicAPI) RequestCommunityInfoFromMailserver(communityID string) error {
+	return api.service.messenger.RequestCommunityInfoFromMailserver(communityID)
+}
+
 func (api *PublicAPI) UnreadActivityCenterNotificationsCount() (uint64, error) {
 	return api.service.messenger.UnreadActivityCenterNotificationsCount()
 }

services/ext/service.go

@@ -153,7 +153,7 @@ func (s *Service) InitProtocol(identity *ecdsa.PrivateKey, db *sql.DB, multiAcco
 	s.multiAccountsDB = multiAccountDb
 	s.account = acc
 
-	options, err := buildMessengerOptions(s.config, identity, db, s.multiAccountsDB, acc, envelopesMonitorConfig, s.accountsDB, logger, signal.SendMessageDelivered)
+	options, err := buildMessengerOptions(s.config, identity, db, s.multiAccountsDB, acc, envelopesMonitorConfig, s.accountsDB, logger, &MessengerSignalsHandler{})
 	if err != nil {
 		return err
 	}
@@ -442,7 +442,7 @@ func buildMessengerOptions(
 	envelopesMonitorConfig *transport.EnvelopesMonitorConfig,
 	accountsDB *accounts.Database,
 	logger *zap.Logger,
-	messageDeliveredHandler protocol.MessageDeliveredHandler,
+	messengerSignalsHandler protocol.MessengerSignalsHandler,
 ) ([]protocol.Option, error) {
 	options := []protocol.Option{
 		protocol.WithCustomLogger(logger),
@@ -453,7 +453,7 @@ func buildMessengerOptions(
 		protocol.WithAccount(account),
 		protocol.WithEnvelopesMonitorConfig(envelopesMonitorConfig),
 		protocol.WithOnNegotiatedFilters(onNegotiatedFilters),
-		protocol.WithDeliveredHandler(messageDeliveredHandler),
+		protocol.WithSignalsHandler(messengerSignalsHandler),
 		protocol.WithENSVerificationConfig(publishMessengerResponse, config.VerifyENSURL, config.VerifyENSContractAddress),
 	}
 

services/ext/signal.go

@@ -3,6 +3,7 @@ package ext
 import (
 	"github.com/status-im/status-go/eth-node/types"
 	"github.com/status-im/status-go/protocol"
+	"github.com/status-im/status-go/protocol/communities"
 	"github.com/status-im/status-go/signal"
 )
 
@@ -48,3 +49,16 @@ func (h PublisherSignalHandler) FilterAdded(filters []*signal.Filter) {
 func (h PublisherSignalHandler) NewMessages(response *protocol.MessengerResponse) {
 	signal.SendNewMessages(response)
 }
+
+// MessengerSignalHandler sends signals on messenger events
+type MessengerSignalsHandler struct{}
+
+// MessageDelivered passes information that message was delivered
+func (m MessengerSignalsHandler) MessageDelivered(chatID string, messageID string) {
+	signal.SendMessageDelivered(chatID, messageID)
+}
+
+// MessageDelivered passes info about community that was requested before
+func (m MessengerSignalsHandler) CommunityInfoFound(community *communities.Community) {
+	signal.SendCommunityInfoFound(community)
+}

signal/events_messenger.go

@@ -1,9 +1,15 @@
 package signal
 
+import "github.com/status-im/status-go/protocol/communities"
+
 const (
 
 	// EventMesssageDelivered triggered when we got acknowledge from datasync level, that means peer got message
 	EventMesssageDelivered = "message.delivered"
+
+	// EventCommunityFound triggered when user requested info about some community and messenger successfully
+	// retrieved it from mailserver
+	EventCommunityInfoFound = "community.found"
 )
 
 // MessageDeliveredSignal specifies chat and message that was delivered
@@ -12,7 +18,20 @@ type MessageDeliveredSignal struct {
 	MessageID string `json:"messageID"`
 }
 
+// MessageDeliveredSignal specifies chat and message that was delivered
+type CommunityInfoFoundSignal struct {
+	Name         string `json:"name"`
+	Description  string `json:"description"`
+	MembersCount int    `json:"membersCount"`
+	Verified     bool   `json:"verified"`
+}
+
 // SendMessageDelivered notifies about delivered message
 func SendMessageDelivered(chatID string, messageID string) {
 	send(EventMesssageDelivered, MessageDeliveredSignal{ChatID: chatID, MessageID: messageID})
 }
+
+// SendMessageDelivered notifies about delivered message
+func SendCommunityInfoFound(community *communities.Community) {
+	send(EventCommunityInfoFound, community)
+}