mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-29 23:05:34 +08:00
102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package broker
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import (
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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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"github.com/chrislusf/seaweedfs/weed/util"
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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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subscriberId := in.Init.SubscriberId
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println("+ subscriber:", subscriberId)
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defer println("- subscriber:", subscriberId)
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// TODO look it up
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topicConfig := &messaging_pb.TopicConfiguration{
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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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// loop through all messages
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for {
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_, buf := lock.logBuffer.ReadFromBuffer(lastReadTime)
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for pos := 0; pos+4 < len(buf); {
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size := util.BytesToUint32(buf[pos : pos+4])
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entryData := buf[pos+4 : pos+4+int(size)]
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logEntry := &filer_pb.LogEntry{}
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if err = proto.Unmarshal(entryData, logEntry); err != nil {
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glog.Errorf("unexpected unmarshal messaging_pb.Message: %v", err)
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pos += 4 + int(size)
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continue
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}
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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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pos += 4 + int(size)
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continue
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}
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// fmt.Printf("sending : %d : %s\n", len(m.Value), string(m.Value))
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if err = eachMessageFn(m); err != nil {
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return err
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}
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lastReadTime = time.Unix(0, m.Timestamp)
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pos += 4 + int(size)
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}
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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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}
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}
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