github.com/tenywen/fabric@v1.0.0-beta.0.20170620030522-a5b1ed380643/core/ledger/kvledger/marble_example/main/marble_example.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 "fmt" 21 22 "os" 23 24 configtxtest "github.com/hyperledger/fabric/common/configtx/test" 25 "github.com/hyperledger/fabric/core/ledger" 26 "github.com/hyperledger/fabric/core/ledger/kvledger/example" 27 "github.com/hyperledger/fabric/core/ledger/ledgerconfig" 28 "github.com/hyperledger/fabric/core/ledger/ledgermgmt" 29 "github.com/hyperledger/fabric/core/ledger/testutil" 30 "github.com/hyperledger/fabric/core/ledger/util" 31 "github.com/hyperledger/fabric/protos/common" 32 logging "github.com/op/go-logging" 33 ) 34 35 const ( 36 ledgerID = "Default" 37 ) 38 39 var logger = logging.MustGetLogger("main") 40 41 var peerLedger ledger.PeerLedger 42 var marbleApp *example.MarbleApp 43 var committer *example.Committer 44 var consenter *example.Consenter 45 46 func init() { 47 48 // Initialization will get a handle to the ledger at the specified path 49 // Note, if subledgers are supported in the future, 50 // the various ledgers could be created/managed at this level 51 logger.Debugf("Marble Example main init()") 52 53 //call a helper method to load the core.yaml 54 testutil.SetupCoreYAMLConfig() 55 56 cleanup() 57 ledgermgmt.Initialize() 58 var err error 59 gb, _ := configtxtest.MakeGenesisBlock(ledgerID) 60 peerLedger, err = ledgermgmt.CreateLedger(gb) 61 62 if err != nil { 63 panic(fmt.Errorf("Error in NewKVLedger(): %s", err)) 64 } 65 marbleApp = example.ConstructMarbleAppInstance(peerLedger) 66 committer = example.ConstructCommitter(peerLedger) 67 consenter = example.ConstructConsenter() 68 } 69 70 func main() { 71 defer ledgermgmt.Close() 72 // Each of the functions here will emulate endorser, orderer, 73 // and committer by calling ledger APIs to similate the proposal, 74 // get simulation results, create a transaction, add it to a block, 75 // and then commit the block. 76 77 initApp() 78 transferMarble() 79 80 } 81 82 func initApp() { 83 logger.Debugf("Marble Example initApp() to create a marble") 84 marble := []string{"marble1", "blue", "35", "tom"} 85 tx, err := marbleApp.CreateMarble(marble) 86 handleError(err, true) 87 rawBlock := consenter.ConstructBlock(tx) 88 err = committer.Commit(rawBlock) 89 handleError(err, true) 90 printBlocksInfo(rawBlock) 91 } 92 93 func transferMarble() { 94 logger.Debugf("Marble Example transferMarble()") 95 tx1, err := marbleApp.TransferMarble([]string{"marble1", "jerry"}) 96 handleError(err, true) 97 rawBlock := consenter.ConstructBlock(tx1) 98 err = committer.Commit(rawBlock) 99 handleError(err, true) 100 printBlocksInfo(rawBlock) 101 } 102 103 func printBlocksInfo(block *common.Block) { 104 // Read invalid transactions filter 105 txsFltr := util.TxValidationFlags(block.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER]) 106 numOfInvalid := 0 107 // Count how many transaction indeed invalid 108 for i := 0; i < len(block.Data.Data); i++ { 109 if txsFltr.IsInvalid(i) { 110 numOfInvalid++ 111 } 112 } 113 fmt.Printf("Num txs in rawBlock = [%d], num invalidTxs = [%d]\n", 114 len(block.Data.Data), numOfInvalid) 115 } 116 117 func handleError(err error, quit bool) { 118 if err != nil { 119 if quit { 120 panic(fmt.Errorf("Error: %s\n", err)) 121 } else { 122 fmt.Printf("Error: %s\n", err) 123 } 124 } 125 } 126 127 func cleanup() { 128 ledgerRootPath := ledgerconfig.GetRootPath() 129 os.RemoveAll(ledgerRootPath) 130 }