mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-04 11:09:03 +08:00
110 lines
3.4 KiB
Go
110 lines
3.4 KiB
Go
package broker
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"github.com/seaweedfs/seaweedfs/weed/glog"
|
|
"github.com/seaweedfs/seaweedfs/weed/mq/topic"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
|
|
"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
|
|
"time"
|
|
)
|
|
|
|
func (b *MessageQueueBroker) SubscribeMessage(req *mq_pb.SubscribeMessageRequest, stream mq_pb.SeaweedMessaging_SubscribeMessageServer) error {
|
|
|
|
t := topic.FromPbTopic(req.GetInit().Topic)
|
|
partition := topic.FromPbPartition(req.GetInit().GetPartitionOffset().GetPartition())
|
|
localTopicPartition := b.localTopicManager.GetTopicPartition(t, partition)
|
|
if localTopicPartition == nil {
|
|
stream.Send(&mq_pb.SubscribeMessageResponse{
|
|
Message: &mq_pb.SubscribeMessageResponse_Ctrl{
|
|
Ctrl: &mq_pb.SubscribeMessageResponse_CtrlMessage{
|
|
Error: "not initialized",
|
|
},
|
|
},
|
|
})
|
|
return nil
|
|
}
|
|
|
|
clientName := fmt.Sprintf("%s/%s-%s", req.GetInit().ConsumerGroup, req.GetInit().ConsumerId, req.GetInit().ClientId)
|
|
localTopicPartition.Subscribers.AddSubscriber(clientName, topic.NewLocalSubscriber())
|
|
glog.V(0).Infof("Subscriber %s connected on %v %v", clientName, t, partition)
|
|
isConnected := true
|
|
sleepIntervalCount := 0
|
|
defer func() {
|
|
isConnected = false
|
|
localTopicPartition.Subscribers.RemoveSubscriber(clientName)
|
|
glog.V(0).Infof("Subscriber %s on %v %v disconnected", clientName, t, partition)
|
|
}()
|
|
|
|
ctx := stream.Context()
|
|
var startPosition log_buffer.MessagePosition
|
|
var inMemoryOnly bool
|
|
if req.GetInit()!=nil && req.GetInit().GetPartitionOffset() != nil {
|
|
offset := req.GetInit().GetPartitionOffset()
|
|
if offset.StartTsNs != 0 {
|
|
startPosition = log_buffer.NewMessagePosition(offset.StartTsNs, -2)
|
|
}
|
|
if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST {
|
|
startPosition = log_buffer.NewMessagePosition(1, -2)
|
|
} else if offset.StartType == mq_pb.PartitionOffsetStartType_LATEST {
|
|
startPosition = log_buffer.NewMessagePosition(time.Now().UnixNano(), -2)
|
|
} else if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST_IN_MEMORY {
|
|
inMemoryOnly = true
|
|
for !localTopicPartition.HasData() {
|
|
time.Sleep(337 * time.Millisecond)
|
|
}
|
|
memPosition := localTopicPartition.GetEarliestInMemoryMessagePosition()
|
|
if startPosition.Before(memPosition.Time) {
|
|
startPosition = memPosition
|
|
}
|
|
}
|
|
}
|
|
|
|
localTopicPartition.Subscribe(clientName, startPosition, inMemoryOnly, func() bool {
|
|
if !isConnected {
|
|
return false
|
|
}
|
|
sleepIntervalCount++
|
|
if sleepIntervalCount > 10 {
|
|
sleepIntervalCount = 10
|
|
}
|
|
time.Sleep(time.Duration(sleepIntervalCount) * 337 * time.Millisecond)
|
|
|
|
// Check if the client has disconnected by monitoring the context
|
|
select {
|
|
case <-ctx.Done():
|
|
err := ctx.Err()
|
|
if err == context.Canceled {
|
|
// Client disconnected
|
|
return false
|
|
}
|
|
glog.V(0).Infof("Subscriber %s disconnected: %v", clientName, err)
|
|
return false
|
|
default:
|
|
// Continue processing the request
|
|
}
|
|
|
|
return true
|
|
}, func(logEntry *filer_pb.LogEntry) error {
|
|
// reset the sleep interval count
|
|
sleepIntervalCount = 0
|
|
|
|
value := logEntry.GetData()
|
|
if err := stream.Send(&mq_pb.SubscribeMessageResponse{Message: &mq_pb.SubscribeMessageResponse_Data{
|
|
Data: &mq_pb.DataMessage{
|
|
Key: []byte(fmt.Sprintf("key-%d", logEntry.PartitionKeyHash)),
|
|
Value: value,
|
|
TsNs: logEntry.TsNs,
|
|
},
|
|
}}); err != nil {
|
|
glog.Errorf("Error sending setup response: %v", err)
|
|
return err
|
|
}
|
|
return nil
|
|
})
|
|
|
|
return nil
|
|
}
|