Dialogflow es dialogflow'的基于承诺的函数；s动作图

通过NodeJS Google Actions SDK设置Google Assistant应用程序的方式如下：

这些似乎是同步函数（根据上提供的文档）

pickOption

和

optionPicked

是否可能是异步函数？即，将

pickOption

实现为

function pickOption(){
   var pickOptionPromise = Q.defer();
   pickOptionPromise.resolve({
     /*Some results here*/
   });
   return pickOptionPromise.promise;
}

---

是的，有两个函数在大多数情况下用于将响应返回给助手。

app.ask

和

app.tell

。这两个函数将您的响应包装成JSON对象并返回给Google

---

您的

pickOption

和

optionpick

函数可以异步运行，并在逻辑完成后运行

app.tell

。

对于初学者，根本不要求您使用

app.handleRequest（）

（您甚至不需要使用

app

，但这不是您的问题。）它是一种方便的方法，可以将意图映射到函数，但您可以通过其他方式自由地执行该任务

function handler1( app ){
  // Does the logic asynchronously, but no voice response for some situation.
  // Returns a Promise that resolves to an Object about what we did
}

function handler2( app ){
  // Does the logic asynchronously, but no voice response for some situation.
  // Returns a Promise that resolves to an Object about what we did
}

function chooseHandler( app ){
  // Some logic which may be async, but which returns
  // a Promise that will resolve to either handler1 or 2
}

function sendResponse( app, handlerResult ){
  // Uses the handlerResult object to determine what to
  // send back to the user. This may involve async database calls.
  // Calls either app.ask(), or app.tell(), or a related call.
  // Returns a Promise indicating success
}

chooseHandler( app )
  .then( handler => handler( app ) )
  .then( result  => sendResponse( app, result ) )
  .catch( err => {
    // Log the error or something
  } );

（这是为了说明问题。它没有经过实际测试，也不能保证为特定用途提供最高质量或最佳设计。）

在本例中，

chooseHandler（）

通常是同步的，但如果我们需要检查用户以前是否与我们在一起，并在此基础上选择其他处理程序，则可以是异步的。处理程序几乎总是异步的，重要的一点是它们实际上不会选择发送回用户的短语-这在

sendResponse（）中完成

，还可能涉及异步的数据库调用

function handler1( app ){
  // Does the logic asynchronously, but no voice response for some situation.
  // Returns a Promise that resolves to an Object about what we did
}

function handler2( app ){
  // Does the logic asynchronously, but no voice response for some situation.
  // Returns a Promise that resolves to an Object about what we did
}

function chooseHandler( app ){
  // Some logic which may be async, but which returns
  // a Promise that will resolve to either handler1 or 2
}

function sendResponse( app, handlerResult ){
  // Uses the handlerResult object to determine what to
  // send back to the user. This may involve async database calls.
  // Calls either app.ask(), or app.tell(), or a related call.
  // Returns a Promise indicating success
}

chooseHandler( app )
  .then( handler => handler( app ) )
  .then( result  => sendResponse( app, result ) )
  .catch( err => {
    // Log the error or something
  } );