mirror of
https://github.com/seaweedfs/seaweedfs.git
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79 lines
2.5 KiB
Go
79 lines
2.5 KiB
Go
package broker
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import (
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"context"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/mq/sub_coordinator"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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// SubscriberToSubCoordinator coordinates the subscribers
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func (b *MessageQueueBroker) SubscriberToSubCoordinator(stream mq_pb.SeaweedMessaging_SubscriberToSubCoordinatorServer) error {
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if !b.lockAsBalancer.IsLocked() {
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return status.Errorf(codes.Unavailable, "not current broker balancer")
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}
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req, err := stream.Recv()
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if err != nil {
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return err
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}
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var cgi *sub_coordinator.ConsumerGroupInstance
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// process init message
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initMessage := req.GetInit()
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if initMessage != nil {
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cgi = b.Coordinator.AddSubscriber(initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic)
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glog.V(0).Infof("subscriber %s/%s/%s connected", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic)
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} else {
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return status.Errorf(codes.InvalidArgument, "subscriber init message is empty")
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}
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defer func() {
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b.Coordinator.RemoveSubscriber(initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic)
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glog.V(0).Infof("subscriber %s/%s/%s disconnected: %v", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic, err)
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}()
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ctx := stream.Context()
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// process ack messages
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go func() {
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for {
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_, err := stream.Recv()
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if err != nil {
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glog.V(0).Infof("subscriber %s/%s/%s receive: %v", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic, err)
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}
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select {
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case <-ctx.Done():
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err := ctx.Err()
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if err == context.Canceled {
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// Client disconnected
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return
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}
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return
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default:
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// Continue processing the request
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}
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}
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}()
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// send commands to subscriber
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for {
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select {
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case <-ctx.Done():
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err := ctx.Err()
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if err == context.Canceled {
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// Client disconnected
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return err
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}
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glog.V(0).Infof("subscriber %s/%s/%s disconnected: %v", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic, err)
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return err
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case message := <-cgi.ResponseChan:
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glog.V(0).Infof("subscriber %s/%s/%s send: %v", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic, message)
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if err := stream.Send(message); err != nil {
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glog.V(0).Infof("subscriber %s/%s/%s send: %v", initMessage.ConsumerGroup, initMessage.ConsumerGroupInstanceId, initMessage.Topic, err)
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}
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}
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}
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}
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