我一直在尝试从Java SDK为Hyperledger Fabric v1.4.4中的BYFN网络调用和查询事务，到目前为止，我已经启动了网络（在两个组织中有两个对等点，安装了订购者和链码mycc） 。网络成功启动，脚本和测试完成。
这是我的Java SDK代码，用于通过Java操作网络并进行查询和调用
主类：
public class sdksample {
// Main program to simply call the client, Am i making some mistake here ?? persistency ?
public static void main(String[] args) throws Exception {
// create fabric-ca client
BlockChainHFClient.getInstance().setupCryptoMaterialsForClient();
BlockChainHFClient.getInstance().initChannel();
// get HFC client instance
BlockChainHFClient client = BlockChainHFClient.getInstance();
System.out.println(client);
}
}
BlockchainClient类：
public class BlockChainHFClient {
private static BlockChainHFClient instance;
/**
* Client instance constructor
*/
private BlockChainHFClient() {
}
/**
* Returns an instance of the Fabric client
*
* @return instance
*/
public static synchronized BlockChainHFClient getInstance() {
if (instance == null) {
instance = new BlockChainHFClient();
}
return instance;
}
/**
* Fabric client object
*/
final HFClient hfClient = HFClient.createNewInstance();
/**
* Crypto config folder location . keep crypto-config folder in user/home
*/
final String CRYPTO_CONFIG_HOME_DIR = System.getProperty("user.home");
/**
* Grpcs URL
*/
final String GRPCS = "grpcs://";
/**
* Dot for utility
*/
final String DOT = ".";
/**
* MSP ID Root
*/
final String ROOT_MSP_ID = "Org1MSP";
/**
* Admin user
*/
final String PEER_ADMIN = "PeerAdmin";
/**
* Channel object
*/
Channel channel;
/**
* Channel initialize timeout values
*/
final Long ChannelBuilderOptionkeepAliveMinutes = 15L;
final Long ChannelBuilderOptionkeepAliveSeconds = 15L;
/**
* Get channel instance
*
* @return channel
*/
public Channel getChannel() {
return channel;
}
/**
* Get HF client
*
* @return HF client
*/
public HFClient getClient() {
return hfClient;
}
/**
* Set up User contexts by using Crypto materials - Private key and cert files
*
* @throws CryptoException
* @throws InvalidArgumentException
* @throws IllegalAccessException
* @throws InstantiationException
* @throws ClassNotFoundException
* @throws NoSuchMethodException
* @throws InvocationTargetException
*/
public void setupCryptoMaterialsForClient()
throws CryptoException, InvalidArgumentException, IllegalAccessException, InstantiationException,
ClassNotFoundException, NoSuchMethodException, InvocationTargetException {
hfClient.setCryptoSuite(CryptoSuite.Factory.getCryptoSuite());
hfClient.setUserContext(new User() {
public String getName() {
return PEER_ADMIN;
}
public Set<String> getRoles() {
return null;
}
public String getAccount() {
return null;
}
public String getAffiliation() {
return null;
}
public Enrollment getEnrollment() {
return new Enrollment() {
public PrivateKey getKey() {
PrivateKey privateKey = null;
File privateKeyFile = findFileSk(
"D:\\Hyperledger Fabric_Research_Blockchain\\Fabric1.4.4\\fabric-samples\\first-network\\crypto-config\\peerOrganizations\\org1.example.com\\users\\Admin@org1.example.com\\msp\\keystore");
try {
privateKey = getPrivateKeyFromBytes(
IOUtils.toByteArray(new FileInputStream(privateKeyFile)));
} catch (IOException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return privateKey;
}
public String getCert() {
String certificate = null;
try {
File certificateFile = new File(
"D:\\Hyperledger Fabric_Research_Blockchain\\Fabric1.4.4\\fabric-samples\\first-network\\crypto-config\\peerOrganizations\\org1.example.com\\users\\Admin@org1.example.com\\msp\\signcerts\\Admin@org1.example.com-cert.pem");
certificate = new String(IOUtils.toByteArray(new FileInputStream(certificateFile)),
"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return certificate;
}
};
}
public String getMspId() {
return ROOT_MSP_ID;
}
});
}
public void initChannel() throws Exception {
Properties peerProperties = new Properties();
peerProperties.setProperty("pemFile",
"D:\\Hyperledger Fabric_Research_Blockchain\\Fabric1.4.4\\fabric-samples\\first-network\\crypto-config\\peerOrganizations\\org1.example.com\\peers\\peer0.org1.example.com\\tls\\server.crt");
peerProperties.setProperty("trustServerCertificate", "true"); // testing environment only NOT FOR PRODUCTION!
peerProperties.setProperty("hostnameOverride", "peer0.org1.example.com");
peerProperties.setProperty("sslProvider", "openSSL");
peerProperties.setProperty("negotiationType", "TLS");
peerProperties.put("grpc.NettyChannelBuilderOption.maxInboundMessageSize", 9000000);
Peer peer = hfClient.newPeer("peer0.org1.example.com", "grpcs://localhost:7051");
Properties ordererProperties = new Properties();
ordererProperties.setProperty("pemFile",
"D:\\Hyperledger Fabric_Research_Blockchain\\Fabric1.4.4\\fabric-samples\\first-network\\crypto-config\\ordererOrganizations\\example.com\\orderers\\orderer.example.com\\tls\\server.crt");
ordererProperties.setProperty("trustServerCertificate", "true"); // testing environment only NOT FOR PRODUCTION!
ordererProperties.setProperty("hostnameOverride", "orderer.example.com");
ordererProperties.setProperty("sslProvider", "openSSL");
ordererProperties.setProperty("negotiationType", "TLS");
ordererProperties.put("grpc.NettyChannelBuilderOption.keepAliveTime", new Object[] { 5L, TimeUnit.MINUTES });
ordererProperties.put("grpc.NettyChannelBuilderOption.keepAliveTimeout", new Object[] { 8L, TimeUnit.SECONDS });
Orderer orderer = hfClient.newOrderer("orderer.example.com", "grpcs://localhost:7050");
Channel channel = hfClient.newChannel("mychannel");
channel.addPeer(peer);
channel.addOrderer(orderer);
channel.initialize();
moveUnits(hfClient);
queryBlockChain(hfClient);
}
private String printableString(String string) {
int maxLogStringLength = 10000;
if (string == null || string.length() == 0) {
return string;
}
String ret = string.replaceAll("[^\\p{Print}]", "\n");
ret = ret.substring(0, Math.min(ret.length(), maxLogStringLength))
+ (ret.length() > maxLogStringLength ? "..." : "");
return ret;
}
void queryBlockChain(HFClient client) throws ProposalException, InvalidArgumentException {
// get channel instance from client
Channel channel = client.getChannel("mychannel");
// create chaincode request
QueryByChaincodeRequest qpr = client.newQueryProposalRequest();
// build cc id providing the chaincode name. Version is omitted here.
ChaincodeID cid = ChaincodeID.newBuilder().setName("mycc").build();
qpr.setChaincodeID(cid);
// CC function to be called
qpr.setFcn("query");
qpr.setArgs(new String[] { "a" });
Collection<ProposalResponse> res = channel.queryByChaincode(qpr);
// display response
for (ProposalResponse pres : res) {
String stringResponse = new String(pres.getChaincodeActionResponsePayload());
System.out.println(stringResponse);
}
}
void moveUnits(HFClient client)
throws Exception {
Channel channel = client.getChannel("mychannel");
TransactionProposalRequest req = client.newTransactionProposalRequest();
ChaincodeID cid = ChaincodeID.newBuilder().setName("mycc").setVersion("1.0").build();
req.setChaincodeID(cid);
req.setFcn("invoke");
req.setArgs(new String[] {"a","b","50"});
Collection<ProposalResponse> resps = channel.sendTransactionProposal(req);
channel.sendTransaction(resps);
}
/**
* Utility method to get private key from bytes using Bouncy Castle Security
* Provider
*
* @param data
* @return privateKey
* @throws IOException
* @throws NoSuchProviderException
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
private PrivateKey getPrivateKeyFromBytes(byte[] data)
throws IOException, NoSuchProviderException, NoSuchAlgorithmException, InvalidKeySpecException {
final Reader pemReader = new StringReader(new String(data));
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
final PrivateKeyInfo pemPair;
try (PEMParser pemParser = new PEMParser(pemReader)) {
pemPair = (PrivateKeyInfo) pemParser.readObject();
}
PrivateKey privateKey = new JcaPEMKeyConverter().setProvider(BouncyCastleProvider.PROVIDER_NAME)
.getPrivateKey(pemPair);
return privateKey;
}
/**
* Find files ending with _sk
*
* @param directorys
* @return file
*/
private File findFileSk(String directorys) {
File directory = new File(directorys);
File[] matches = directory.listFiles((dir, name) -> name.endsWith("_sk"));
if (null == matches) {
throw new RuntimeException(
format("Matches returned null does %s directory exist?", directory.getAbsoluteFile().getName()));
}
if (matches.length != 1) {
throw new RuntimeException(format("Expected in %s only 1 sk file but found %d",
directory.getAbsoluteFile().getName(), matches.length));
}
return matches[0];
}
}
设置加密资料部分和通道初始化部分工作正常（向通道添加对等点和订单并对其进行初始化）
在QueryProposal或TransactionProposal期间出现错误，也就是说，如果我在使用所需的加密材料初始化通道后想要执行任何操作
这是错误跟踪：
消息请求处理失败；嵌套异常为 org.hyperledger.fabric.sdk.exception.ProposalException： org.hyperledger.fabric.sdk.exception.ProposalException：频道 对等端peer0.org1.example.com上的mychannel提案失败 org.hyperledger.fabric.sdk.exception.TransactionException： org.hyperledger.fabric.sdk.exception.ProposalException：getConfigBlock 频道mychannel失败，对等方peer0.org1.example.com。状态 失败，详细信息：频道频道{id：1，名称：mychannel}正在发送 交易建议： 3323e96e7e9147ccee2491b310e6dacfc2db93d50578f08a43a5c997a211135a至 Peer {id：7，name：peer0.org1.example.com，channelName：mychannel， url：grpcs：// localhost：7051}由于以下原因而失败：gRPC failure =状态{code =不可用，description = io异常， cause = io.netty.channel.AbstractChannel $ AnnotatedConnectException： 连接被拒绝：没有更多信息： 本地主机/ 0：0：0：0：0：0：0：1：7051
我尝试更改docker映像，但没有工作，同样的错误，我感觉到此错误与grpcs拒绝与端口上的对等方连接有关吗？有什么我想念的东西或可以阻止访问同行的东西。该端口已经使用过某个地方，或者可能是防火墙？因为这在具有相同步骤的另一个系统中起作用。对此不太确定。 建议会有所帮助！
谢谢