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package sub_client
import (
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/mq/topic"
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
"sync"
"time"
)
type ProcessorState struct {
stopCh chan struct{}
}
// Subscribe subscribes to a topic's specified partitions.
// If a partition is moved to another broker, the subscriber will automatically reconnect to the new broker.
func (sub *TopicSubscriber) Subscribe() error {
go sub.startProcessors()
// loop forever
sub.doKeepConnectedToSubCoordinator()
return nil
}
func (sub *TopicSubscriber) startProcessors() {
// listen to the messages from the sub coordinator
// start one processor per partition
var wg sync.WaitGroup
semaphore := make(chan struct{}, sub.SubscriberConfig.MaxPartitionCount)
for message := range sub.brokerPartitionAssignmentChan {
if assigned := message.GetAssignment(); assigned != nil {
wg.Add(1)
semaphore <- struct{}{}
topicPartition := topic.FromPbPartition(assigned.PartitionAssignment.Partition)
// wait until no covering partition is still in progress
sub.waitUntilNoOverlappingPartitionInFlight(topicPartition)
// start a processors
stopChan := make(chan struct{})
sub.activeProcessorsLock.Lock()
sub.activeProcessors[topicPartition] = &ProcessorState{
stopCh: stopChan,
}
sub.activeProcessorsLock.Unlock()
go func(assigned *mq_pb.BrokerPartitionAssignment, topicPartition topic.Partition) {
defer func() {
sub.activeProcessorsLock.Lock()
delete(sub.activeProcessors, topicPartition)
sub.activeProcessorsLock.Unlock()
<-semaphore
wg.Done()
}()
glog.V(0).Infof("subscriber %s/%s assigned partition %+v at %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
sub.brokerPartitionAssignmentAckChan <- &mq_pb.SubscriberToSubCoordinatorRequest{
Message: &mq_pb.SubscriberToSubCoordinatorRequest_AckAssignment{
AckAssignment: &mq_pb.SubscriberToSubCoordinatorRequest_AckAssignmentMessage{
Partition: assigned.Partition,
},
},
}
err := sub.onEachPartition(assigned, stopChan)
if err != nil {
glog.V(0).Infof("subscriber %s/%s partition %+v at %v: %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker, err)
} else {
glog.V(0).Infof("subscriber %s/%s partition %+v at %v completed", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
}
sub.brokerPartitionAssignmentAckChan <- &mq_pb.SubscriberToSubCoordinatorRequest{
Message: &mq_pb.SubscriberToSubCoordinatorRequest_AckUnAssignment{
AckUnAssignment: &mq_pb.SubscriberToSubCoordinatorRequest_AckUnAssignmentMessage{
Partition: assigned.Partition,
},
},
}
}(assigned.PartitionAssignment, topicPartition)
}
if unAssignment := message.GetUnAssignment(); unAssignment != nil {
topicPartition := topic.FromPbPartition(unAssignment.Partition)
sub.activeProcessorsLock.Lock()
if processor, found := sub.activeProcessors[topicPartition]; found {
close(processor.stopCh)
delete(sub.activeProcessors, topicPartition)
}
sub.activeProcessorsLock.Unlock()
}
}
wg.Wait()
}
func (sub *TopicSubscriber) waitUntilNoOverlappingPartitionInFlight(topicPartition topic.Partition) {
foundOverlapping := true
for foundOverlapping {
sub.activeProcessorsLock.Lock()
foundOverlapping = false
var overlappedPartition topic.Partition
for partition, _ := range sub.activeProcessors {
if partition.Overlaps(topicPartition) {
if partition.Equals(topicPartition) {
continue
}
foundOverlapping = true
overlappedPartition = partition
break
}
}
sub.activeProcessorsLock.Unlock()
if foundOverlapping {
glog.V(0).Infof("subscriber %s new partition %v waiting for partition %+v to complete", sub.ContentConfig.Topic, topicPartition, overlappedPartition)
time.Sleep(1 * time.Second)
}
}
}
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