如何订阅和查看来自 Hyperledger Composer 交易的事件

Question

我是运行一个 NodeJS 服务器，使用以下代码连接到 Hyperledger 运行时：

const BusinessNetworkConnection = require("composer-client")
  .BusinessNetworkConnection;
this.businessNetworkConnection = new BusinessNetworkConnection();
this.CONNECTION_PROFILE_NAME = "hlfv1";
this.businessNetworkIdentifier = "testNetwork";
this.businessNetworkConnection
  .connect(
    this.CONNECTION_PROFILE_NAME,
    this.businessNetworkIdentifier,
    "admin",
    "adminpwd"
  )
  .then(result => {
    this.businessNetworkDefinition = result;
    console.log("BusinessNetworkConnection: ", result);
  })
  .then(() => {
    // Subscribe to events.
    this.businessNetworkConnection.on("events", events => {
      console.log("**********business event received**********", events);
    });
  })
  // and catch any exceptions that are triggered
  .catch(function(error) {
    throw error;
  });

我在 result 对象中看到建立连接后返回的数据，这是已部署的正确网络数据。

但是，当我提交交易并通过我生成的 REST API 发出请求时，我的服务器看不到任何事件。在 Historian 中，我可以看到事件已发出。我还应该做些什么来查看我的交易发出的那些事件吗？

Answer 1

我试过同样的测试，我可以收到事件。我比较了我的测试代码和你的，我发现了以下差异：

this.bizNetworkConnection.on('events'

this.bizNetworkConnection.on('event'

希望对您有所帮助。

如何订阅和查看来自 Hyperledger Composer 交易的事件

How to subscribe to and see events from Hyperledger Composer transactions

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hyperledger-composer