github.com/myafeier/fabric@v1.0.1-0.20170722181825-3a4b1f2bce86/events/producer/producer.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package producer
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"time"
    23  
    24  	"github.com/hyperledger/fabric/common/flogging"
    25  	pb "github.com/hyperledger/fabric/protos/peer"
    26  )
    27  
    28  var logger = flogging.MustGetLogger("eventhub_producer")
    29  
    30  // EventsServer implementation of the Peer service
    31  type EventsServer struct {
    32  }
    33  
    34  //singleton - if we want to create multiple servers, we need to subsume events.gEventConsumers into EventsServer
    35  var globalEventsServer *EventsServer
    36  
    37  // NewEventsServer returns a EventsServer
    38  func NewEventsServer(bufferSize uint, timeout time.Duration) *EventsServer {
    39  	if globalEventsServer != nil {
    40  		panic("Cannot create multiple event hub servers")
    41  	}
    42  	globalEventsServer = new(EventsServer)
    43  	initializeEvents(bufferSize, timeout)
    44  	//initializeCCEventProcessor(bufferSize, timeout)
    45  	return globalEventsServer
    46  }
    47  
    48  // Chat implementation of the Chat bidi streaming RPC function
    49  func (p *EventsServer) Chat(stream pb.Events_ChatServer) error {
    50  	handler, err := newEventHandler(stream)
    51  	if err != nil {
    52  		return fmt.Errorf("error creating handler during handleChat initiation: %s", err)
    53  	}
    54  	defer handler.Stop()
    55  	for {
    56  		in, err := stream.Recv()
    57  		if err == io.EOF {
    58  			logger.Debug("Received EOF, ending Chat")
    59  			return nil
    60  		}
    61  		if err != nil {
    62  			e := fmt.Errorf("error during Chat, stopping handler: %s", err)
    63  			logger.Error(e.Error())
    64  			return e
    65  		}
    66  		err = handler.HandleMessage(in)
    67  		if err != nil {
    68  			logger.Errorf("Error handling message: %s", err)
    69  			return err
    70  		}
    71  	}
    72  }