问：HyperLedger fabric-starter-kit 定制

Question

我遵循基本的guide 来启动和运行 HyperLedger fabric-starter-kit，它运行良好。我无法弄清楚如何成功更改 app.js 的开发目录而不会导致“无效的 ELF 标头”错误：

root@104efc36f09e:/user/env# node app
module.js:355
   Module._extensions[extension](this, filename);
                           ^
Error: /user/env/node_modules/grpc/src/node/extension_binary/grpc_node.node: invalid ELF header
   at Error (native)
   at Module.load (module.js:355:32)
   at Function.Module._load (module.js:310:12)
   at Module.require (module.js:365:17)
   at require (module.js:384:17)
   at Object.<anonymous> (/user/env/node_modules/grpc/src/node/src/grpc_extension.js:38:15)
   at Module._compile (module.js:460:26)
   at Object.Module._extensions..js (module.js:478:10)
   at Module.load (module.js:355:32)
   at Function.Module._load (module.js:310:12)
root@104efc36f09e:/user/env#

Dockerfile（不变）：

FROM hyperledger/fabric-peer:latest
WORKDIR $GOPATH/src/github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02
RUN go build
WORKDIR $GOPATH/src/github.com/hyperledger/fabric/examples/sdk/node
RUN npm install hfc`

docker-compose.yaml（将卷更改为本地工作目录：~/Documents/Work/Blockchain/env）：

membersrvc:
  container_name: membersrvc
  image: hyperledger/fabric-membersrvc
  command: membersrvc

peer:
  container_name: peer
  image: hyperledger/fabric-peer
  environment:
    - CORE_PEER_ADDRESSAUTODETECT=true
    - CORE_VM_ENDPOINT=unix:///var/run/docker.sock
    - CORE_LOGGING_LEVEL=DEBUG
    - CORE_PEER_ID=vp0
    - CORE_SECURITY_ENABLED=true
    - CORE_PEER_PKI_ECA_PADDR=membersrvc:7054
    - CORE_PEER_PKI_TCA_PADDR=membersrvc:7054
    - CORE_PEER_PKI_TLSCA_PADDR=membersrvc:7054
    - CORE_PEER_VALIDATOR_CONSENSUS_PLUGIN=noops
  # this gives access to the docker host daemon to deploy chain code in network mode
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock
  # have the peer wait 10 sec for membersrvc to start
  #  the following is to run the peer in Developer mode - also set sample DEPLOY_MODE=dev
  command: sh -c "sleep 10; peer node start --peer-chaincodedev"
  #command: sh -c "sleep 10; peer node start"
  links:
    - membersrvc

starter:
  container_name: starter
  image: hyperledger/fabric-starter-kit
  volumes:
    - ~/Documents/Work/Blockchain/env:/user/env
  environment:
    - MEMBERSRVC_ADDRESS=membersrvc:7054
    - PEER_ADDRESS=peer:7051
    - KEY_VALUE_STORE=/tmp/hl_sdk_node_key_value_store
    # set to following to 'dev' if peer running in Developer mode
    - DEPLOY_MODE=dev
    - CORE_CHAINCODE_ID_NAME=mycc
    - CORE_PEER_ADDRESS=peer:7051
  # the following command will start the chain code when this container starts and ready it for deployment by the app
  command: sh -c "sleep 20; /opt/gopath/src/github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02/chaincode_example02"
  stdin_open: true
  tty: true
  links:
    - membersrvc
    - peer

app.js（不变）：

/*
 * A simple application utilizing the Node.js Client SDK to:
 * 1) Enroll a user
 * 2) User deploys chaincode
 * 3) User queries chaincode
 */
// "HFC" stands for "Hyperledger Fabric Client"
var hfc = require("hfc");

console.log(" **** STARTING APP.JS ****");

// get the addresses from the docker-compose environment
var PEER_ADDRESS         = process.env.CORE_PEER_ADDRESS;
var MEMBERSRVC_ADDRESS   = process.env.MEMBERSRVC_ADDRESS;

var chain, chaincodeID;

// Create a chain object used to interact with the chain.
// You can name it anything you want as it is only used by client.
chain = hfc.newChain("mychain");

// Initialize the place to store sensitive private key information
chain.setKeyValStore( hfc.newFileKeyValStore('/tmp/keyValStore') );

// Set the URL to membership services and to the peer
console.log("member services address ="+MEMBERSRVC_ADDRESS);
console.log("peer address ="+PEER_ADDRESS);
chain.setMemberServicesUrl("grpc://"+MEMBERSRVC_ADDRESS);
chain.addPeer("grpc://"+PEER_ADDRESS);

// The following is required when the peer is started in dev mode
// (i.e. with the '--peer-chaincodedev' option)
var mode =  process.env['DEPLOY_MODE'];
console.log("DEPLOY_MODE=" + mode);
if (mode === 'dev') {
    chain.setDevMode(true);xs
    //Deploy will not take long as the chain should already be running
    chain.setDeployWaitTime(10);
} else {
    chain.setDevMode(false);
    //Deploy will take much longer in network mode
    chain.setDeployWaitTime(120);
}


chain.setInvokeWaitTime(10);

// Begin by enrolling the user
enroll();

// Enroll a user.
function enroll() {
   console.log("enrolling user admin ...");
   // Enroll "admin" which is preregistered in the membersrvc.yaml
   chain.enroll("admin", "Xurw3yU9zI0l", function(err, admin) {
      if (err) {
         console.log("ERROR: failed to register admin: %s",err);
         process.exit(1);
      }
      // Set this user as the chain's registrar which is authorized to register other users.
      chain.setRegistrar(admin);

      var userName = "JohnDoe";
      // registrationRequest
      var registrationRequest = {
          enrollmentID: userName,
          affiliation: "bank_a"
      };
      chain.registerAndEnroll(registrationRequest, function(error, user) {
          if (error) throw Error(" Failed to register and enroll " + userName + ": " + error);
          console.log("Enrolled %s successfully\n", userName);
          deploy(user);
      });      
   });
}

// Deploy chaincode
function deploy(user) {
   console.log("deploying chaincode; please wait ...");
   // Construct the deploy request
   var deployRequest = {
       chaincodeName: process.env.CORE_CHAINCODE_ID_NAME,
       fcn: "init",
       args: ["a", "100", "b", "200"]
   };
   // where is the chain code, ignored in dev mode
   deployRequest.chaincodePath = "github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02";

   // Issue the deploy request and listen for events
   var tx = user.deploy(deployRequest);
   tx.on('complete', function(results) {
       // Deploy request completed successfully
       console.log("deploy complete; results: %j",results);
       // Set the testChaincodeID for subsequent tests
       chaincodeID = results.chaincodeID;
       invoke(user);
   });
   tx.on('error', function(error) {
       console.log("Failed to deploy chaincode: request=%j, error=%k",deployRequest,error);
       process.exit(1);
   });

}

// Query chaincode
function query(user) {
   console.log("querying chaincode ...");
   // Construct a query request
   var queryRequest = {
      chaincodeID: chaincodeID,
      fcn: "query",
      args: ["a"]
   };
   // Issue the query request and listen for events
   var tx = user.query(queryRequest);
   tx.on('complete', function (results) {
      console.log("query completed successfully; results=%j",results);
      process.exit(0);
   });
   tx.on('error', function (error) {
      console.log("Failed to query chaincode: request=%j, error=%k",queryRequest,error);
      process.exit(1);
   });
}

//Invoke chaincode
function invoke(user) {
   console.log("invoke chaincode ...");
   // Construct a query request
   var invokeRequest = {
      chaincodeID: chaincodeID,
      fcn: "invoke",
      args: ["a", "b", "1"]
   };
   // Issue the invoke request and listen for events
   var tx = user.invoke(invokeRequest);
   tx.on('submitted', function (results) {
          console.log("invoke submitted successfully; results=%j",results);       
       });   
   tx.on('complete', function (results) {
      console.log("invoke completed successfully; results=%j",results);
      query(user);      
   });
   tx.on('error', function (error) {
      console.log("Failed to invoke chaincode: request=%j, error=%k",invokeRequest,error);
      process.exit(1);
   });
}

我的目标是使用 HFC 创建身份验证服务，以便 Android 应用调用事务。任何帮助将不胜感激。

Answer 1

你在你的 mac 中安装了节点模块，并在你的 Linux docker 镜像中使用了它们。这就是导致问题的原因。

确保npm 模块构建在您正在执行它的平台上。通过首先删除node_modules 并从starter docker 映像中运行npm install，在您的Linux 环境中重新安装您的节点模块。

请同时咨询这些问题，

NodeJs Google Compute Engine Invalid ELF Header when using 'gcloud' module

"invalid ELF header" when using the nodejs "ref" module on AWS Lambda

Answer 2

感谢 Sufiyan Ghori 指出这一点 - 问题是节点模块安装在我的主机 (mac) 中，因此与我尝试在其中执行代码的 linux docker 映像不兼容。

解决方案：

• 从工作目录中删除node_modules 文件夹。
• 从starter docker 镜像内部运行npm install hfc@0.6.x。