github.com/tenywen/fabric@v1.0.0-beta.0.20170620030522-a5b1ed380643/orderer/sample_clients/single_tx_client/single_tx_client.go (about) 1 /* 2 Copyright Digital Asset Holdings, LLC 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 "fmt" 21 "time" 22 23 "github.com/hyperledger/fabric/common/configtx/tool/provisional" 24 cb "github.com/hyperledger/fabric/protos/common" 25 ab "github.com/hyperledger/fabric/protos/orderer" 26 "github.com/hyperledger/fabric/protos/utils" 27 28 "github.com/golang/protobuf/proto" 29 "github.com/op/go-logging" 30 "golang.org/x/net/context" 31 "google.golang.org/grpc" 32 ) 33 34 var logger = logging.MustGetLogger("single_tx_client") 35 36 var UPDATE byte = 0 37 var SEND byte = 1 38 39 var NEEDED_UPDATES = 2 40 var NEEDED_SENT = 1 41 42 func main() { 43 logger.Info("Creating an Atomic Broadcast GRPC connection.") 44 timeout := 4 * time.Second 45 clientconn, err := grpc.Dial(":7101", grpc.WithBlock(), grpc.WithTimeout(timeout), grpc.WithInsecure()) 46 if err != nil { 47 logger.Errorf("Failed to connect to GRPC: %s", err) 48 return 49 } 50 client := ab.NewAtomicBroadcastClient(clientconn) 51 52 resultch := make(chan byte) 53 errorch := make(chan error) 54 55 logger.Info("Starting a goroutine waiting for ledger updates.") 56 go updateReceiver(resultch, errorch, client) 57 58 logger.Info("Starting a single broadcast sender goroutine.") 59 go broadcastSender(resultch, errorch, client) 60 61 checkResults(resultch, errorch) 62 } 63 64 func checkResults(resultch chan byte, errorch chan error) { 65 l := len(errorch) 66 for i := 0; i < l; i++ { 67 errres := <-errorch 68 logger.Error(errres) 69 } 70 71 updates := 0 72 sentBroadcast := 0 73 for i := 0; i < 3; i++ { 74 select { 75 case result := <-resultch: 76 switch result { 77 case UPDATE: 78 updates++ 79 case SEND: 80 sentBroadcast++ 81 } 82 case <-time.After(30 * time.Second): 83 continue 84 } 85 } 86 if updates != NEEDED_UPDATES { 87 logger.Errorf("We did not get all the ledger updates.") 88 } else if sentBroadcast != NEEDED_SENT { 89 logger.Errorf("We were unable to send all the broadcasts.") 90 } else { 91 logger.Info("Successfully sent and received everything.") 92 } 93 } 94 95 func updateReceiver(resultch chan byte, errorch chan error, client ab.AtomicBroadcastClient) { 96 logger.Info("{Update Receiver} Creating a ledger update delivery stream.") 97 dstream, err := client.Deliver(context.Background()) 98 if err != nil { 99 errorch <- fmt.Errorf("Failed to get Deliver stream: %s", err) 100 return 101 } 102 dstream.Send(&cb.Envelope{ 103 Payload: utils.MarshalOrPanic(&cb.Payload{ 104 Header: &cb.Header{ 105 ChannelHeader: utils.MarshalOrPanic(&cb.ChannelHeader{ 106 ChannelId: provisional.TestChainID, 107 }), 108 SignatureHeader: utils.MarshalOrPanic(&cb.SignatureHeader{}), 109 }, 110 Data: utils.MarshalOrPanic(&ab.SeekInfo{ 111 Start: &ab.SeekPosition{Type: &ab.SeekPosition_Newest{}}, 112 Stop: &ab.SeekPosition{Type: &ab.SeekPosition_Newest{}}, 113 Behavior: ab.SeekInfo_BLOCK_UNTIL_READY, 114 }), 115 }), 116 }) 117 118 logger.Info("{Update Receiver} Listening to ledger updates.") 119 for i := 0; i < 2; i++ { 120 m, inerr := dstream.Recv() 121 if inerr != nil { 122 errorch <- fmt.Errorf("Failed to receive consensus: %s", inerr) 123 return 124 } 125 b := m.Type.(*ab.DeliverResponse_Block) 126 logger.Info("{Update Receiver} Received a ledger update.") 127 for i, tx := range b.Block.Data.Data { 128 pl := &cb.Payload{} 129 e := &cb.Envelope{} 130 merr1 := proto.Unmarshal(tx, e) 131 merr2 := proto.Unmarshal(e.Payload, pl) 132 if merr1 == nil && merr2 == nil { 133 logger.Infof("{Update Receiver} %d - %v", i+1, pl.Data) 134 } 135 } 136 resultch <- UPDATE 137 } 138 logger.Info("{Update Receiver} Exiting...") 139 } 140 141 func broadcastSender(resultch chan byte, errorch chan error, client ab.AtomicBroadcastClient) { 142 logger.Info("{Broadcast Sender} Waiting before sending.") 143 <-time.After(5 * time.Second) 144 bstream, err := client.Broadcast(context.Background()) 145 if err != nil { 146 errorch <- fmt.Errorf("Failed to get broadcast stream: %s", err) 147 return 148 } 149 bs := []byte{0, 1, 2, 3} 150 pl := &cb.Payload{ 151 Header: &cb.Header{ 152 ChannelHeader: utils.MarshalOrPanic(&cb.ChannelHeader{ 153 ChannelId: provisional.TestChainID, 154 }), 155 }, 156 Data: bs, 157 } 158 mpl, err := proto.Marshal(pl) 159 if err != nil { 160 panic("Failed to marshal payload.") 161 } 162 bstream.Send(&cb.Envelope{Payload: mpl}) 163 logger.Infof("{Broadcast Sender} Broadcast sent: %v", bs) 164 logger.Info("{Broadcast Sender} Exiting...") 165 resultch <- SEND 166 }