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 }