github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/orderer/sample_clients/deliver_stdout/client.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 main
    18  
    19  import (
    20  	"flag"
    21  	"fmt"
    22  	"math"
    23  
    24  	"github.com/hyperledger/fabric/common/configtx/tool/provisional"
    25  	"github.com/hyperledger/fabric/orderer/localconfig"
    26  	cb "github.com/hyperledger/fabric/protos/common"
    27  	ab "github.com/hyperledger/fabric/protos/orderer"
    28  	"github.com/hyperledger/fabric/protos/utils"
    29  	"golang.org/x/net/context"
    30  	"google.golang.org/grpc"
    31  )
    32  
    33  type deliverClient struct {
    34  	client  ab.AtomicBroadcast_DeliverClient
    35  	chainID string
    36  }
    37  
    38  func newDeliverClient(client ab.AtomicBroadcast_DeliverClient, chainID string) *deliverClient {
    39  	return &deliverClient{client: client, chainID: chainID}
    40  }
    41  
    42  func seekHelper(chainID string, start *ab.SeekPosition) *cb.Envelope {
    43  	return &cb.Envelope{
    44  		Payload: utils.MarshalOrPanic(&cb.Payload{
    45  			Header: &cb.Header{
    46  				ChannelHeader: utils.MarshalOrPanic(&cb.ChannelHeader{
    47  					ChannelId: chainID,
    48  				}),
    49  				SignatureHeader: utils.MarshalOrPanic(&cb.SignatureHeader{}),
    50  			},
    51  
    52  			Data: utils.MarshalOrPanic(&ab.SeekInfo{
    53  				Start:    &ab.SeekPosition{Type: &ab.SeekPosition_Oldest{Oldest: &ab.SeekOldest{}}},
    54  				Stop:     &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: math.MaxUint64}}},
    55  				Behavior: ab.SeekInfo_BLOCK_UNTIL_READY,
    56  			}),
    57  		}),
    58  	}
    59  }
    60  
    61  func (r *deliverClient) seekOldest() error {
    62  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Oldest{Oldest: &ab.SeekOldest{}}}))
    63  }
    64  
    65  func (r *deliverClient) seekNewest() error {
    66  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Newest{Newest: &ab.SeekNewest{}}}))
    67  }
    68  
    69  func (r *deliverClient) seek(blockNumber uint64) error {
    70  	return r.client.Send(seekHelper(r.chainID, &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: blockNumber}}}))
    71  }
    72  
    73  func (r *deliverClient) readUntilClose() {
    74  	for {
    75  		msg, err := r.client.Recv()
    76  		if err != nil {
    77  			fmt.Println("Error receiving:", err)
    78  			return
    79  		}
    80  
    81  		switch t := msg.Type.(type) {
    82  		case *ab.DeliverResponse_Status:
    83  			fmt.Println("Got status ", t)
    84  			return
    85  		case *ab.DeliverResponse_Block:
    86  			fmt.Println("Received block: ", t.Block)
    87  		}
    88  	}
    89  }
    90  
    91  func main() {
    92  	config := config.Load()
    93  
    94  	var chainID string
    95  	var serverAddr string
    96  
    97  	flag.StringVar(&serverAddr, "server", fmt.Sprintf("%s:%d", config.General.ListenAddress, config.General.ListenPort), "The RPC server to connect to.")
    98  	flag.StringVar(&chainID, "chainID", provisional.TestChainID, "The chain ID to deliver from.")
    99  	flag.Parse()
   100  
   101  	conn, err := grpc.Dial(serverAddr, grpc.WithInsecure())
   102  	if err != nil {
   103  		fmt.Println("Error connecting:", err)
   104  		return
   105  	}
   106  	client, err := ab.NewAtomicBroadcastClient(conn).Deliver(context.TODO())
   107  	if err != nil {
   108  		fmt.Println("Error connecting:", err)
   109  		return
   110  	}
   111  
   112  	s := newDeliverClient(client, chainID)
   113  	err = s.seekOldest()
   114  	if err != nil {
   115  		fmt.Println("Received error:", err)
   116  	}
   117  
   118  	s.readUntilClose()
   119  }