基于hyperledger联盟链的汽车轨迹追溯系统
Posted 计划是动力
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一、koa架构整理
在完成之前的六个流程之后，已经完成一个简易的可交互的前后端系统，在此基础上进行系统开发
之前的后端架构可移植性不好，这里进行后端架构的整理
在controller文件夹下建立工具模块tool.js
用于封装所有与区块链相关的业务(交易，查询，根据hash回溯交易）
const Fabric_Client = require('fabric-client');
const path = require('path');
const os = require('os')
const util = require('util')
const fs = require('fs');
// const theStotePath = '/home/zatnr/文档/sitpProject/20210302/carChain/app/hfc-key-store';
const theStotePath = './hfc-key-store';
async function excuteQuery (sendRequest)
const title = 'admin page'
let result = ''
var fabric_client = new Fabric_Client();
var key = "name"
// setup the fabric network
var channel = fabric_client.newChannel('mychannel');
var peer = fabric_client.newPeer('grpc://localhost:7051');
channel.addPeer(peer);
//
var member_user = null;
// var store_path = path.join(os.homedir(), '.hfc-key-store');
var store_path = path.join(theStotePath);
console.log('Store path:'+store_path);
// create the key value store as defined in the fabric-client/config/default.json 'key-value-store' setting
result = await Fabric_Client.newDefaultKeyValueStore( path: store_path
).then((state_store) =>
// assign the store to the fabric client
fabric_client.setStateStore(state_store);
var crypto_suite = Fabric_Client.newCryptoSuite();
// use the same location for the state store (where the users' certificate are kept)
// and the crypto store (where the users' keys are kept)
var crypto_store = Fabric_Client.newCryptoKeyStore(path: store_path);
crypto_suite.setCryptoKeyStore(crypto_store);
fabric_client.setCryptoSuite(crypto_suite);
// get the enrolled user from persistence, this user will sign all requests
return fabric_client.getUserContext('user1', true);
).then((user_from_store) =>
if (user_from_store && user_from_store.isEnrolled())
console.log('Successfully loaded user1 from persistence');
member_user = user_from_store;
else
throw new Error('Failed to get user1.... run registerUser.js');
// get a transaction id object based on the current user assigned to fabric client
tx_id = fabric_client.newTransactionID();
console.log("Assigning transaction_id: ", tx_id._transaction_id);
// recordTuna - requires 5 args, ID, vessel, location, timestamp,holder - ex: args: ['10', 'Hound', '-12.021, 28.012', '1504054225', 'Hansel'],
// send proposal to endorser
sendRequest.txId = tx_id;
console.log("sendRequest...."+sendRequest.txId)
const request = sendRequest;
// send the query proposal to the peer
return channel.queryByChaincode(request);
).then((query_responses) =>
console.log("Query has completed, checking results");
// query_responses could have more than one results if there multiple peers were used as targets
if (query_responses && query_responses.length == 1)
if (query_responses[0] instanceof Error)
console.error("error from query = ", query_responses[0]);
result = "Could not locate tuna"
else
console.log("Response is ", query_responses[0].toString());
return query_responses[0].toString()
else
console.log("No payloads were returned from query");
result = "Could not locate tuna"
).catch((err) =>
console.error('Failed to query successfully :: ' + err);
result = 'Failed to query successfully :: ' + err
);
// await ctx.render('index',
// title, result
// )
return result
async function executeTranSaction(sendRequest)
console.log(`request.....$sendRequest`)
var fabric_client = new Fabric_Client();
// setup the fabric network
var channel = fabric_client.newChannel('mychannel');
var peer = fabric_client.newPeer('grpc://localhost:7051');
var order = fabric_client.newOrderer('grpc://localhost:7050')
channel.addOrderer(order);
channel.addPeer(peer);
var member_user = null;
// var store_path = path.join(os.homedir(), '.hfc-key-store');
var store_path = path.join(theStotePath);
console.log('Store path:'+store_path);
// create the key value store as defined in the fabric-client/config/default.json 'key-value-store' setting
let result = await Fabric_Client.newDefaultKeyValueStore( path: store_path
).then((state_store) =>
// assign the store to the fabric client
fabric_client.setStateStore(state_store);
var crypto_suite = Fabric_Client.newCryptoSuite();
// use the same location for the state store (where the users' certificate are kept)
// and the crypto store (where the users' keys are kept)
var crypto_store = Fabric_Client.newCryptoKeyStore(path: store_path);
crypto_suite.setCryptoKeyStore(crypto_store);
fabric_client.setCryptoSuite(crypto_suite);
// get the enrolled user from persistence, this user will sign all requests
return fabric_client.getUserContext('user1', true);
).then((user_from_store) =>
if (user_from_store && user_from_store.isEnrolled())
console.log('Successfully loaded user1 from persistence');
member_user = user_from_store;
else
throw new Error('Failed to get user1.... run registerUser.js');
// get a transaction id object based on the current user assigned to fabric client
tx_id = fabric_client.newTransactionID();
console.log("Assigning transaction_id: ", tx_id._transaction_id);
// recordTuna - requires 5 args, ID, vessel, location, timestamp,holder - ex: args: ['10', 'Hound', '-12.021, 28.012', '1504054225', 'Hansel'],
// send proposal to endorser
sendRequest.txId = tx_id;
console.log("sendRequest...."+sendRequest.txId)
const request = sendRequest;
// send the transaction proposal to the peers
return channel.sendTransactionProposal(request);
).then((results) =>
var proposalResponses = results[0];
var proposal = results[1];
let isProposalGood = false;
if (proposalResponses && proposalResponses[0].response &&
proposalResponses[0].response.status === 200)
isProposalGood = true;
console.log('Transaction proposal was good');
else
console.error('Transaction proposal was bad');
if (isProposalGood)
console.log(util.format(
'Successfully sent Proposal and received ProposalResponse: Status - %s, message - "%s"',
proposalResponses[0].response.status, proposalResponses[0].response.message));
// build up the request for the orderer to have the transaction committed
var request =
proposalResponses: proposalResponses,
proposal: proposal
;
// set the transaction listener and set a timeout of 30 sec
// if the transaction did not get committed within the timeout period,
// report a TIMEOUT status
var transaction_id_string = tx_id.getTransactionID(); //Get the transaction ID string to be used by the event processing
var promises = [];
var sendPromise = channel.sendTransaction(request);
promises.push(sendPromise); //we want the send transaction first, so that we know where to check status
// get an eventhub once the fabric client has a user assigned. The user
// is required bacause the event registration must be signed
//------------------------------------------------------------
// let event_hub = fabric_client.newEventHub('grpc://localhost:7053');
// // let event_hub = new ChannelEventHub(channel, peer);
// //接下来设置EventHub，用于监听Transaction是否成功写入，这里也是启用了TLS
// let data = fs.readFileSync('/home/fabric/Documents/carChain/basic-network/crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt');
// let grpcOpts =
// 'pem': Buffer.from(data).toString(),
// 'ssl-target-name-override': "peer0.org1.example.com"
//
// event_hub.setPeerAddr('grpc://localhost:7053',grpcOpts);
// event_hub.connect();
// console.log('data:'+data);
// console.log('grpcOpts.pem:'+grpcOpts.pem);
//------------------------------------------------------------
let event_hub = channel.newChannelEventHub('localhost:7051');
//------------------------------------------------------------
// using resolve the promise so that result status may be processed
// under the then clause rather than having the catch clause process
// the status
let txPromise = new Promise((resolve, reject) =>
let handle = setTimeout(() =>
event_hub.disconnect();
resolve(event_status : 'TIMEOUT'); //we could use reject(new Error('Trnasaction did not complete within 30 seconds'));
, 3000);
event_hub.connect();
event_hub.registerTxEvent(transaction_id_string, (tx, code) =>
// this is the callback for transaction event status
// first some clean up of event listener
clearTimeout(handle);
event_hub.unregisterTxEvent(transaction_id_string);
event_hub.disconnect();
// now let the application know what happened
var return_status = event_status : code, tx_id : transaction_id_string;
if (code !== 'VALID')
console.error('The transaction was invalid, code = ' + code);
resolve(return_status); // we could use reject(new Error('Problem with the tranaction, event status ::'+code));
else
//-------------------------------------------------------------------------------------------
//console.log('The transaction has been committed on peer ' + event_hub._ep._endpoint.addr);
//-------------------------------------------------------------------------------------------
console.log('The transaction has been committed on peer ' + event_hub.getPeerAddr());
//-------------------------------------------------------------------------------------------
resolve(return_status);
, (err) =>
//this is the callback if something goes wrong with the event registration or processing
reject(new Error('There was a problem with the eventhub ::'+err));
);
);
promises.push(txPromise);
return Promise.all(promises);
else
console.error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
throw new Error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
).then((results) =>
console.log('Send transaction promise and event listener promise have completed');
// check the results in the order the promises were added to the promise all list
if (results && results[0] && results[0].status === 'SUCCESS')
console.log('Successfully sent transaction to the orderer.');
//res.send(tx_id.getTransactionID());
return tx_id.getTransactionID();
else
console.error('Failed to order the transaction. Error code: ' + response.status);
if(results && results[1] && results[1].event_status === 'VALID')
console.log('Successfully committed the change to the ledger by the peer');
//res.send(tx_id.getTransactionID());
return tx_id.getTransactionID();
else
console.log('Transaction failed to be committed to the ledger due to ::'+results[1].event_status);
).catch((err) =>
console.error('Failed to invoke successfully :: ' + err);
);
return result
async function excuteRecall ( hash )
var fabric_client = new Fabric_Client();
var key = "name"
// setup the fabric network
var channel = fabric_client.newChannel('mychannel');
var peer = fabric_client.newPeer('grpc://localhost:7051');
channel.addPeer(peer);
//
var member_user = null;
// var store_path = path.join(os.homedir(), '.hfc-key-store');
var store_path = path.join(theStotePath);
console.log('Store path:'+store_path);
// create the key value store as defined in the fabric-client/config/default.json 'key-value-store' setting
result = await Fabric_Client.newDefaultKeyValueStore( path: store_path
).then((state_store) =>
// assign the store to the fabric client
fabric_client.setStateStore(state_store);
var crypto_suite = Fabric_Client.newCryptoSuite();
// use the same location for the state store (where the users' certificate are kept)
// and the crypto store (where the users' keys are kept)
var crypto_store = Fabric_Client.newCryptoKeyStore(path: store_path);
crypto_suite.setCryptoKeyStore(crypto_store);
fabric_client.setCryptoSuite(crypto_suite);
// get the enrolled user from persistence, this user will sign all requests
return fabric_client.getUserContext('user1', true);
).then((user_from_store) =>
if (user_from_store && user_from_store.isEnrolled())
console.log('Successfully loaded user1 from persistence');
member_user = user_from_store;
else
throw new Error('Failed to get user1.... run registerUser.js');
// send the query proposal to the peer
return channel.queryBlockByTxID(hash,peer,true,false);
// return channel.queryByChaincode(request);
).then((query_responses) =>
console.log("Query has completed, checking results");
// query_responses could have more than one results if there multiple peers were used as targets
if (query_responses)
if (query_responses[0] instanceof Error)
console.error("error from query = ", query_responses[0]);
result = "Could not locate tuna"
else
console.log("Response is ", query_responses);
return query_responses
else
console.log("No payloads were returned from query");
result = "Could not locate tuna"
).catch((err) =>
console.error('Failed to query successfully :: ' + err);
result = 'Failed to query successfully :: ' + err
);
// await ctx.render('index',
// title, result
// )
return result
/**
* Calculate a 32 bit FNV-1a hash
* Found here: https://gist.github.com/vaiorabbit/5657561
* Ref.: http://isthe.com/chongo/tech/comp/fnv/
*
* @param string str the input value
* @param boolean [asString=false] set to true to return the hash value as
* 8-digit hex string instead of an integer
* @param integer [seed] optionally pass the hash of the previous chunk
* @returns integer | string
*/
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