// handleChainPublication processes an Authenticated Broadcast publication.
// It takes as input a publication.
func (s *Subscriber) handleChainPublication(pub *pb.Publication) bool {
// Verify MACs
verified := s.verifyChainMACs(pub, s.chainRange)
if !verified {
// fmt.Printf("Not verified\n")
return false
}
// fmt.Printf("Verified\n")
// Make the map so not trying to access nil reference
if s.pubsLearned[pub.PublisherID] == nil {
s.pubsLearned[pub.PublisherID] = make(map[int64]string)
}
// If already learned this publication
if s.pubsLearned[pub.PublisherID][pub.PublicationID] != "" {
// fmt.Printf("Already learned publication %v from publisher %v.\n", pub.PublicationID, pub.PublisherID)
return false
}
s.pubsLearned[pub.PublisherID][pub.PublicationID] = common.GetInfo(pub)
//fmt.Printf("Learned publication %v from publisher %v.\n", pub.PublicationID, pub.PublisherID)
return true
}
// handleBrbPublication processes a Bracha's Reliable Broadcast publication.
// It takes as input a publication.
func (s *Subscriber) handleBrbPublication(pub *pb.Publication) bool {
foundQuorum := false
// Make the map so not trying to access nil reference
if s.pubsReceived[pub.PublisherID] == nil {
s.pubsReceived[pub.PublisherID] = make(map[int64]map[uint64]string)
}
// Make the map so not trying to access nil reference
if s.pubsReceived[pub.PublisherID][pub.PublicationID] == nil {
s.pubsReceived[pub.PublisherID][pub.PublicationID] = make(map[uint64]string)
}
// Publication has not been received yet for this publisher ID, publication ID, broker ID
if s.pubsReceived[pub.PublisherID][pub.PublicationID][pub.BrokerID] == "" {
// So record it
s.pubsReceived[pub.PublisherID][pub.PublicationID][pub.BrokerID] = common.GetInfo(pub)
// Check if there is a quorum yet for this publisher ID and publication ID
foundQuorum = s.checkQuorum(pub.PublisherID, pub.PublicationID)
if foundQuorum && pub.PublicationID < 0 {
s.handleHistoryPublication(pub)
}
}
return foundQuorum
}
// handleEcho handles echo requests from Bracha's Reliable Broadcast.
// It takes the request as input.
func (b Broker) handleEcho(pub *pb.Publication) {
// fmt.Printf("Handle echo Publication %v, Publisher %v, Broker %v.\n", pub.PublicationID, pub.PublisherID, pub.BrokerID)
// Make the map so not trying to access nil reference
if b.echoesReceived[pub.PublisherID] == nil {
b.echoesReceived[pub.PublisherID] = make(map[int64]map[uint64]string)
}
// Make the map so not trying to access nil reference
if b.echoesReceived[pub.PublisherID][pub.PublicationID] == nil {
b.echoesReceived[pub.PublisherID][pub.PublicationID] = make(map[uint64]string)
}
// Echo has not been received yet for this publisher ID, publication ID, broker ID
if b.echoesReceived[pub.PublisherID][pub.PublicationID][pub.BrokerID] == "" {
// So record it
b.echoesReceived[pub.PublisherID][pub.PublicationID][pub.BrokerID] = common.GetInfo(pub)
// Check if there is a quorum yet for this publisher ID and publication ID
foundQuorum := b.checkEchoQuorum(pub.PublisherID, pub.PublicationID)
if b.readiesSent[pub.PublisherID] == nil {
b.readiesSent[pub.PublisherID] = make(map[int64]bool)
}
// If this publication has not been readied yet
if foundQuorum && b.readiesSent[pub.PublisherID][pub.PublicationID] == false {
// Update broker ID
pub.BrokerID = b.localID
// "Send" the ready request to itself
b.fromBrokerReadyCh <- *pub
// Send the ready to all other brokers
b.remoteBrokersMutex.RLock()
for _, remoteBroker := range b.remoteBrokers {
if remoteBroker.toReadyCh != nil {
remoteBroker.toReadyCh <- *pub
if len(remoteBroker.toReadyCh) > b.toBrbChLen/2 {
b.setBusy()
}
}
}
b.remoteBrokersMutex.RUnlock()
// Send the publication to all subscribers
b.subscribersMutex.RLock()
for _, subscriber := range b.subscribers {
// Only if they are interested in the topic
if subscriber.toCh != nil && subscriber.topics[pub.TopicID] == true {
subscriber.toCh <- *pub
if len(subscriber.toCh) > b.toSubscriberChLen/2 {
b.setBusy()
}
}
}
b.subscribersMutex.RUnlock()
// Mark this publication as readied
b.readiesSent[pub.PublisherID][pub.PublicationID] = true
// fmt.Printf("handleEcho: Sent readies for publication %v by publisher %v.\n", pub.PublicationID, pub.PublisherID)
// For performance testing, get the time of the last step for this broker
b.incrementPublicationCount(pub)
}
}
}