github.com/myafeier/fabric@v1.0.1-0.20170722181825-3a4b1f2bce86/peer/common/ordererclient.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 common
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  	"time"
    23  
    24  	cb "github.com/hyperledger/fabric/protos/common"
    25  	ab "github.com/hyperledger/fabric/protos/orderer"
    26  	"golang.org/x/net/context"
    27  	"google.golang.org/grpc"
    28  	"google.golang.org/grpc/credentials"
    29  )
    30  
    31  type BroadcastClient interface {
    32  	//Send data to orderer
    33  	Send(env *cb.Envelope) error
    34  	Close() error
    35  }
    36  
    37  type broadcastClient struct {
    38  	conn   *grpc.ClientConn
    39  	client ab.AtomicBroadcast_BroadcastClient
    40  }
    41  
    42  // GetBroadcastClient creates a simple instance of the BroadcastClient interface
    43  func GetBroadcastClient(orderingEndpoint string, tlsEnabled bool, caFile string) (BroadcastClient, error) {
    44  
    45  	if len(strings.Split(orderingEndpoint, ":")) != 2 {
    46  		return nil, fmt.Errorf("Ordering service endpoint %s is not valid or missing", orderingEndpoint)
    47  	}
    48  
    49  	var opts []grpc.DialOption
    50  	// check for TLS
    51  	if tlsEnabled {
    52  		if caFile != "" {
    53  			creds, err := credentials.NewClientTLSFromFile(caFile, "")
    54  			if err != nil {
    55  				return nil, fmt.Errorf("Error connecting to %s due to %s", orderingEndpoint, err)
    56  			}
    57  			opts = append(opts, grpc.WithTransportCredentials(creds))
    58  		}
    59  	} else {
    60  		opts = append(opts, grpc.WithInsecure())
    61  	}
    62  
    63  	opts = append(opts, grpc.WithTimeout(3*time.Second))
    64  	opts = append(opts, grpc.WithBlock())
    65  
    66  	conn, err := grpc.Dial(orderingEndpoint, opts...)
    67  	if err != nil {
    68  		return nil, fmt.Errorf("Error connecting to %s due to %s", orderingEndpoint, err)
    69  	}
    70  	client, err := ab.NewAtomicBroadcastClient(conn).Broadcast(context.TODO())
    71  	if err != nil {
    72  		conn.Close()
    73  		return nil, fmt.Errorf("Error connecting to %s due to %s", orderingEndpoint, err)
    74  	}
    75  
    76  	return &broadcastClient{conn: conn, client: client}, nil
    77  }
    78  
    79  func (s *broadcastClient) getAck() error {
    80  	msg, err := s.client.Recv()
    81  	if err != nil {
    82  		return err
    83  	}
    84  	if msg.Status != cb.Status_SUCCESS {
    85  		return fmt.Errorf("Got unexpected status: %v", msg.Status)
    86  	}
    87  	return nil
    88  }
    89  
    90  //Send data to orderer
    91  func (s *broadcastClient) Send(env *cb.Envelope) error {
    92  	if err := s.client.Send(env); err != nil {
    93  		return fmt.Errorf("Could not send :%s)", err)
    94  	}
    95  
    96  	err := s.getAck()
    97  
    98  	return err
    99  }
   100  
   101  func (s *broadcastClient) Close() error {
   102  	return s.conn.Close()
   103  }