Dialogflow & Express——实现

Question

我在从 dialogflow 获取响应时遇到问题，而其他 express 调用工作正常。

我知道这是代理的问题，但我不确定问题是什么或如何解决，这就是我在这里提问的原因。

注意事项

正在将此代码添加到已测试的现有 Express 应用程序中
一直在使用 postman
可以找到 Dialogflow fullfillment 模板 webhook here
控制台成功输出We got hours!然后没有继续
如果您注释行 57 through 62 (the if section) 并取消注释行 56，代码会按预期响应
问题预计在 agents.hours 函数中
也试过this.currentlyOpen() === true

非常感谢。

dialogflow.ts

// import { google } from 'googleapis';
const {WebhookClient} = require('dialogflow-fulfillment');
// import { Card, Suggestion } from 'dialogflow-fulfillment';
/**
 * @private
 * Initialise the ai assist api
 */
export class Agents {
  aiassist:any

  async initialize (message:any) {
    var aiassist = {
      info: {
        configsuccess: false,
        message: message,
        data: [],
      }
    }
    process.env.DEBUG = 'dialogflow:debug';
    const url = message.headers.configlocation;
    await message.core.request({url: url, json: true}, function (error: any, response: { statusCode: number; }, data: any) {
      aiassist.info.data = data
      if (!error && response.statusCode === 200) {
        aiassist.info.configsuccess = true
      }
      return aiassist
    })
    this.aiassist = aiassist
    this.WebhookProcessing();
  }

  /**
  * @private
  * Find the map the agent
  */
  WebhookProcessing () {
    const agent = new WebhookClient({request: this.aiassist.info.message.full, response: this.aiassist.info.message.res});

    let intentMap = new Map();
    intentMap.set('Hours', this.hours);

    agent.handleRequest(intentMap);
  }

  /****************
  * AGENT        *
  *  DECLARATION *
  ****************/
  /**
  * [hours description]
  * @param  agent [description]
  * @return       [description]
  */
  hours (agent:any) {
    console.log("We got hours!")
    // agent.add(`We're open now! We close at 17:00 today. Is there anything else I can help you with?`);
    if (currentlyOpen(this.aiassist)) { // TypeError: Cannot read property 'aiassist' of undefined
      console.log("open!")
      agent.add(`We're open now! We close at 17:00 today. Is there anything else I can help you with?`);
    } else {
      console.log("closed!")
    }
  }

}

/******************
* FUNCTIONS      *
*    DECLARATION *
******************/

//  Check if currently open - Issues getting "aiassist" into this function
function currentlyOpen (aiassist:any) {
  // Get current datetime with proper timezone
  console.log("We got currentlyOpen!")
  // const date = new Date()
  console.log(aiassist.info.data.timeZoneOffset)
  // console.log("We finished currentlyOpen")
  // date.setHours(date.getHours() + parseInt(agent.this.aiassist.info.data.timeZoneOffset.split(':')[0]));
  // date.setMinutes(date.getMinutes() + parseInt(agent.this.aiassist.info.data.timeZoneOffset.split(':')[0][0] + agent.this.aiassist.info.data.timeZoneOffset.split(':')[1]));
  // return date.getDay() >= 1 &&
  // date.getDay() <= 5 &&
  // date.getHours() >= agent.this.aiassist.info.data.businessSetings.openTime &&
  // date.getHours() <= agent.this.aiassist.info.data.businessSetings.closeTime;
  return true
}

TypeError: Cannot read property 'aiassist' of undefined
  File "C:\Users\sjona\Desktop\TSC\repo\curr\built\routes\v1\dialogflow.js", line 53, col 32, in hours
    if (currentlyOpen(this.aiassist)) {
  File "C:\Users\sjona\Desktop\TSC\repo\curr\node_modules\dialogflow-fulfillment\src\dialogflow-fulfillment.js", line 313, col 44, in WebhookClient.handleRequest
    let result = handler.get(this.intent)(this);
  File "C:\Users\sjona\Desktop\TSC\repo\curr\built\routes\v1\dialogflow.js", line 39, col 15, in Agents.WebhookProcessing
    agent.handleRequest(intentMap);
  File "C:\Users\sjona\Desktop\TSC\repo\curr\built\routes\v1\dialogflow.js", line 29, col 14, in Agents.initialize
    this.WebhookProcessing();

编辑：更新代码以匹配评论。在出现问题时添加注释。

Answer 1

问题是 this 不是您认为的（或希望的），因为 hours() 的调用方式以及 this 的不同含义取决于它是怎么称呼的。 This page 深入细节，但简而言之（适用于您）：

被调用的函数 this 应用于 全局对象 ，而不是 this 的词法绑定版本（即 - 的值this 里面有一个 class
要获得 this 的词法绑定版本，您需要使用 bind() 将值绑定到函数，或使用箭头函数进行调用。

在您的情况下，这意味着您应该使用类似

的方式注册 Intent Handler

intentMap.set('Hours', agent => this.hours(agent));

Dialogflow & Express——实现

Dialogflow & Express -- Fulfilment

google-api

express

typescript

dialogflow-es

dialogflow-es-fulfillment