You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.3 KiB
94 lines
2.3 KiB
package broker
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import (
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"fmt"
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"io"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
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)
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func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_SubscribeServer) error {
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// process initial request
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in, err := stream.Recv()
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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var messageCount int64
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subscriberId := in.Init.SubscriberId
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fmt.Printf("+ subscriber %s\n", subscriberId)
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defer func() {
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fmt.Printf("- subscriber %s: %d messages\n", subscriberId, messageCount)
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}()
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// TODO look it up
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topicConfig := &messaging_pb.TopicConfiguration{
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IsTransient: true,
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}
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if err = stream.Send(&messaging_pb.BrokerMessage{
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Redirect: nil,
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}); err != nil {
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return err
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}
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// get lock
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tp := TopicPartition{
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Namespace: in.Init.Namespace,
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Topic: in.Init.Topic,
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Partition: in.Init.Partition,
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}
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lock := broker.topicLocks.RequestLock(tp, topicConfig, false)
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defer broker.topicLocks.ReleaseLock(tp, false)
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lastReadTime := time.Now()
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switch in.Init.StartPosition {
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case messaging_pb.SubscriberMessage_InitMessage_TIMESTAMP:
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lastReadTime = time.Unix(0, in.Init.TimestampNs)
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case messaging_pb.SubscriberMessage_InitMessage_LATEST:
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case messaging_pb.SubscriberMessage_InitMessage_EARLIEST:
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}
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// how to process each message
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// an error returned will end the subscription
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eachMessageFn := func(m *messaging_pb.Message) error {
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err := stream.Send(&messaging_pb.BrokerMessage{
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Data: m,
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})
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if err != nil {
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glog.V(0).Infof("=> subscriber %v: %+v", subscriberId, err)
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}
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return err
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}
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messageCount, err = lock.logBuffer.LoopProcessLogData(lastReadTime, func() bool {
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lock.Mutex.Lock()
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lock.cond.Wait()
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lock.Mutex.Unlock()
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return true
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}, func(logEntry *filer_pb.LogEntry) error {
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m := &messaging_pb.Message{}
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if err = proto.Unmarshal(logEntry.Data, m); err != nil {
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glog.Errorf("unexpected unmarshal messaging_pb.Message: %v", err)
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return err
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}
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// fmt.Printf("sending : %d bytes\n", len(m.Value))
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if err = eachMessageFn(m); err != nil {
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glog.Errorf("sending %d bytes to %s: %s", len(m.Value), subscriberId, err)
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return err
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}
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return nil
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})
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return err
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}
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