我有三个客户端应用程序,分别使用Java,Node.js和Go SDK与我的区块链结构进行交互。使用它们,我可以成功查询和更新分类帐。
现在,我想测量分类帐更新期间的延迟。因此,我当时想在提交请求之前先加上一个时间戳,然后在事务已成功提交到分类账之后再加上一个时间戳,然后计算差异。
我的问题是我找不到关于Java,Go和Node.js的SDK API的完整文档,所以我不知道在提交方法返回时,是否可以将事务视为已正确提交到分类帐。
这是我三个客户的代码。 Java:
NetworkConfig ccp = NetworkConfig.fromJsonFile(networkConfigPath.toFile());
// initialize default cryptosuite and setup the client
CryptoSuite cryptoSuite = CryptoSuite.Factory.getCryptoSuite();
HFClient client = HFClient.createNewInstance();
client.setCryptoSuite(cryptoSuite);
Channel channel = client.loadChannelFromConfig(ccp.getChannelNames().iterator().next(), ccp);
channel.initialize();
TransactionProposalRequest transactionProposal = client.newTransactionProposalRequest();
// build chaincode id providing the chaincode name
ChaincodeID mychaincodeID = ChaincodeID.newBuilder().setName("mychaincode").build();
transactionProposal.setChaincodeID(mychaincodeID);
// calling chaincode function
transactionProposal.setFcn("mymethod");
transactionProposal.setArgs("a1");
Collection<ProposalResponse> res = channel.sendTransactionProposal(transactionProposal);
channel.sendTransaction(res);
Node.js:
const gateway = new Gateway();
await gateway.connect(ccp, { wallet: wallet, identity: userName, discovery: { enabled: false } });
// Get the network (channel) our contract is deployed to.
const network = await gateway.getNetwork('mychannel');
// Get the contract from the network.
const contract = network.getContract('mychaincode');
const result = await contract.submitTransaction('mymethod', 'a1');
开始:
sdk, err := fabsdk.New(config.FromFile(configFile))
if err != nil {
fmt.Printf("failed to create SDK: %v\n", err)
return
}
fmt.Println("SDK created")
// Prepare channel client context using client context
clientChannelContext := sdk.ChannelContext(channelID, fabsdk.WithUser(userName), fabsdk.WithOrg(orgName))
// ChannelClient is used to query and execute transactions
client, err := channel.New(clientChannelContext)
if err != nil {
fmt.Printf("failed to create new channel client: %v\n", err)
return
}
fmt.Println("channel client created")
response, err := client.Execute(channel.Request{ChaincodeID: ccID, Fcn: "mymethod", Args: [][]byte{[]byte("a1")}}, channel.WithRetry(retry.DefaultChannelOpts))
if err != nil {
fmt.Printf("failed to execute the invoke function: %v\n", err)
} else {
fmt.Println("Proposal responses: ")
for _, element := range response.Responses {
fmt.Printf("Endorser: %s Status: %d ChaincodeStatus: %d\n", element.Endorser, element.Status, element.ChaincodeStatus)
}
fmt.Println("chaincode transaction completed: " + string(response.Payload))
}
// Close SDK
sdk.Close()
这些代码有效。我的问题是:确定行后是否可以
channel.sendTransaction(res)
(在Java中)
const result = await contract.submitTransaction('mymethod', 'a1');
(在Node.js中)
response, err := client.Execute(channel.Request{ChaincodeID: ccID, Fcn: "mymethod", Args: [][]byte{[]byte("a1")}}, channel.WithRetry(retry.DefaultChannelOpts))
(在Go中) 交易已提交到分类帐吗?
我只在文档上发现了这一点
“将事务提交到分类帐。将在背书的对等方上评估事务功能名称,然后将其提交到订购服务以提交到分类帐。” https://fabric-sdk-node.github.io/release-1.4/module-fabric-network.Contract.html#submitTransaction__anchor
中的Node.js中的SubmitTransaction和
“执行并使用请求和可选请求选项准备和执行事务”,用于执行https://godoc.org/github.com/hyperledger/fabric-sdk-go/pkg/client/channel#Client.Execute处的执行
对于Java,我找不到文档...而且我也不确定Node.js和Go。
答案 0 :(得分:2)
另一个答案,以帮助可能需要CLI的人。
默认情况下,当订单接收到交易时,CLI成功返回。
要等到对peer chaincode invoke
的提交提交,请添加标志--waitForEvent
这样,cli将等待来自同级的提交事件。
希望有帮助。
答案 1 :(得分:1)
我想我解决了。在每个客户端应用程序中,我尝试在请求后的行中向分类帐添加查询。该测试的结果是Node.js and Go版本运行良好:
const result = await contract.submitTransaction('mymethod', 'a1');
和
response, err := client.Execute(channel.Request{ChaincodeID: ccID, Fcn: "mymethod", Args: [][]byte{[]byte("a1")}}, channel.WithRetry(retry.DefaultChannelOpts))
查询结果正常,我得到正确的新值。因此,这意味着在执行方法之后,分类账将正确更新。
对于Java版本,我是通过以下方式解决的:
NetworkConfig ccp = NetworkConfig.fromJsonFile(networkConfigPath.toFile());
// initialize default cryptosuite and setup the client
CryptoSuite cryptoSuite = CryptoSuite.Factory.getCryptoSuite();
HFClient client = HFClient.createNewInstance();
client.setCryptoSuite(cryptoSuite);
Channel channel = client.loadChannelFromConfig(ccp.getChannelNames().iterator().next(), ccp);
channel.initialize();
TransactionProposalRequest transactionProposal = client.newTransactionProposalRequest();
// build chaincode id providing the chaincode name
ChaincodeID mychaincodeID = ChaincodeID.newBuilder().setName("mychaincode").build();
transactionProposal.setChaincodeID(mychaincodeID);
// calling chaincode function
transactionProposal.setFcn("mymethod");
transactionProposal.setArgs("a1");
Collection<ProposalResponse> res = channel.sendTransactionProposal(transactionProposal);
CompletableFuture<TransactionEvent> cf = channel.sendTransaction(res);
TransactionEvent te = cf.get();
logger.info("Status: " + te.isValid());
logger.info("Committed the transaction with transactionID + " + te.getTransactionID());
希望它会有所帮助。当然,如果有人发表评论,他们就会被接受。
答案 2 :(得分:0)
我认为执行此操作的更好方法是使用Fabric EventHub,即注册侦听器并在事件提交时接收事件。使用查询会导致您处理不一致的结果并为延迟的事务执行重试。
下面的代码段可以与NodeSDK一起使用,我认为这将是有用的,更多示例和文档可以在这里找到:https://fabric-sdk-node.github.io/release-1.4/tutorial-listening-to-events.html
var options = {
wallet_path: path.join(__dirname, './creds'),
user_id: 'PeerAdmin',
channel_id: 'mychannel',
chaincode_id: 'fabcar',
peer_url: 'grpc://localhost:7051',
event_url: 'grpc://localhost:7053',
orderer_url: 'grpc://localhost:7050'
};
let eh = client.newEventHub();
eh.setPeerAddr(options.event_url);
eh.connect();
let txPromise = new Promise((resolve, reject) => {
let handle = setTimeout(() => {
eh.disconnect();
reject();
}, 30000);
eh.registerTxEvent(transactionID, (tx, code) => {
clearTimeout(handle);
eh.unregisterTxEvent(transactionID);
eh.disconnect();
if (code !== 'VALID') {
console.error(
'The transaction was invalid, code = ' + code);
reject();
} else {
console.log(
'The transaction has been committed on peer ' +
eh._ep._endpoint.addr);
resolve();
}
});
});
eventPromises.push(txPromise);