我已经在IBM Blockchain平台上部署了示例fabcar网络，并正在使用来自repository的代码与之交互。当我分别调用每个函数时，交互效果很好。
问题出在我开发节点服务器并公开用于调用链码的API时。完成此操作后，我开始收到错误
无法成功调用:::错误：eventhub出了问题::错误：EventHub已关闭
奇怪的是，当我同时向POST调用发送3个请求时，出现此错误。但是记录被插入到IBM云中。
当我同时发送100个请求时，只有大约20个被插入到云中，其余的显示此错误以及其他类似错误
错误：[Orderer.js]：sendBroadcast-错误：“错误：14无法使用：在createStatusError（/ home / trs-laptop-20 / Downloads / fabcar-network / node_modules / fabric-client / ClientDuplexStream._emitStatusIfDone（/ home / trs-laptop-20 / Downloads / fabcar-network / node_modules / fabric-client / node_modules / grpc / src / client上的node_modules / grpc / src / client.js：64：15）\ n。 js：270：19）\ n在ClientDuplexStream._readsDone（/home/trs-laptop-20/Downloads/fabcar-network/node_modules/fabric-client/node_modules/grpc/src/client.js:236:8)\n在readCallback（/home/trs-laptop-20/Downloads/fabcar-network/node_modules/fabric-client/node_modules/grpc/src/client.js:296:12）“
在某些情况下
错误：[client-utils.js]：sendPeersProposal-承诺被拒绝：错误：14不可用：连接失败 在新的createStatusError（/home/trs-laptop-20/Downloads/fabcar-network/node_modules/fabric-client/node_modules/grpc/src/client.js:64:15） 在/home/trs-laptop-20/Downloads/fabcar-network/node_modules/fabric-client/node_modules/grpc/src/client.js:583:15
我不明白为什么显示这些错误。我必须开发一个可以处理负载的高性能应用程序，我们将不胜感激任何帮助和指导。
这是我的app.js代码：
'use strict';
//get libraries
const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const path = require('path');
//create express web-app
const app = express();
const router = express.Router();
app.use(bodyParser.json());
const invoke = require('./invokeNetwork.js');
//declare port
var port = process.env.PORT || 8000;
if (process.env.VCAP_APPLICATION) {
port = process.env.PORT;
}
//run app on port
app.listen(port, function() {
console.log('app running on port: %d', port);
});
app.post('/api/post', async function(req,res){
var carID = req.body.carID;
var make = req.body.make;
var model = req.body.model;
var color = req.body.color;
var owner = req.body.owner;
await invoke.invokeCreate(carID, make, model, color, owner).then((response) => {
//return error if error in response
if (response.status == 500) {
res.status(500).send({ error: response.message });
} else {
//else return success
res.status(200).send({ message: response.message });
}
}).catch(err => {
console.log(err);
});
});
这是invokeNetwork.js代码
'use strict';
var Fabric_Client = require('fabric-client');
var path = require('path');
var util = require('util');
var os = require('os');
var fs = require('fs');
var isError = false;
var throwError = "";
//make sure we have the profiles we need
var networkConfig = path.join(__dirname, './config/network-profile.json')
var clientConfig = path.join(__dirname, './config/client-profile.json');
module.exports = {
invokeCreate: async function(carID, make, model, color, owner) {
isError = false;
//try {
checkProfilesExist(networkConfig, clientConfig); //terminates early if they are not found
// load the base network profile
var fabric_client = Fabric_Client.loadFromConfig(path.join(__dirname, './config/network-profile.json'));
// overlay the client profile over the network profile
fabric_client.loadFromConfig(path.join(__dirname, './config/client-profile.json'));
// setup the fabric network - get the channel that was loaded from the network profile
var channel = fabric_client.getChannel('defaultchannel');
var tx_id = null;
//load the user who is going to unteract with the network
fabric_client.initCredentialStores().then(() => {
// 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');
} else {
throw new Error('Failed to get user1.... run registerUserNetwork.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);
// createCar chaincode function - requires 5 args, ex: args: ['CAR11', 'Honda', 'Accord', 'Black', 'Dave'],
// changeCarOwner chaincode function - requires 2 args , ex: args: ['CAR11', 'MGK'],
var request = {
chaincodeId: 'fabcar',
fcn: 'createCar',
args: [carID, make, model, color, owner],
txId: tx_id
};
// send the transaction proposal to the endorsing 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
console.error('Getting event hub');
let event_hub = fabric_client.getEventHub('org1-peer1');
// 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);
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));
throwError += 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.');
} else {
console.error('Failed to order the transaction. Error code: ' + response.status);
throw new exception("Transaction");
}
if (results && results[1] && results[1].event_status === 'VALID') {
console.log('Successfully committed the change to the ledger by the peer');
return true;
} 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);
isError = true;
throwError += err;
});
console.log(isError);
return {
message: (isError) ? throwError : 'Success Transaction'
}
function checkProfilesExist(networkConfig, clientConfig) {
if (!fs.existsSync(networkConfig)) {
console.log("Error: config file 'network-profile.json' not found.");
console.log("Make sure 'network-profile.json' is copied into the './config' folder.");
process.exit()
}
//make sure we have the client profile we need
if (!fs.existsSync(clientConfig)) {
console.log("Error: config file 'client-profile.json' not found.");
console.log("Make sure 'client-profile.json' is copied into the './config' folder.");
process.exit()
}
}
}
}
//throw new exception("Exceoption thrown");
//return true;
// }
// catch(err) {
// //print and return error
// console.log(err);
// var error = {};
// error.error = err.message;
// return error;
// }
// }
// }
答案 0 :(得分：3)
因此，我们一直在研究面料，并尝试测试一些性能。我遇到了您处理过的所有相同问题，因此将解释我们的问题，并希望它们能为您提供帮助。
Error: There was a problem with the eventhub ::Error: EventHub has been shutdown
有意思的是，这在我们发送大量交易时会出现，并且在我们使用狡猾的Internet连接时也会出现。 fabric docs state：
事件是短暂的，因此，如果在事件发布时注册的侦听器崩溃，则侦听器将错过该事件
我认为问题是eventhub试图连接到我们的API，但是连接存在问题。然后，这会导致eventhub超时（因为它没有收到响应），这将导致eventhub关闭。
同样的面料文档建议：
检出此pastebin中的基本块侦听器-> https://pastebin.com/wCd6Ni46
我们注意到，当我们开始发送大量交易时，我们还会遇到一个错误：14 Unavailable，但这是在大量交易真正淹没网络之后。 我认为我们可以批量处理20个，但是当我们连续快速发送50个或更多时，它就无法处理。
至少在IBP启动程序添加时，记住块被限制为每个块10个事务，因此它需要等待其被挖掘后才能处理下一组事务。在此过程中，我相信缓冲区已满，然后您无法发送太多。
所以您的两个错误是订购者被淹没或同行被太多的交易淹没了。
将事务分成多个块，并等待确认这些事务后再发送更多。这为您的同辈和订购者提供了一些喘息的空间。
希望这会有所帮助！
答案 1 :(得分：0)
正如Priyav Shah非常清楚地解释的那样，要想完全解决该问题，您需要修改API来解决问题。
如果您只是想在短期解决方案上重新启动对等端上的eventhub侦听器，则简单的解决方法是重新启动对等端，并使它重新加入频道并在其上重新安装链码。