将 DialogflowChatbot 与 PostgreSQL 数据库连接

Question

我想将 Dialogflow 中的自定义聊天机器人与 PostgreSQL 数据库连接起来。场景是用户将他/她的查询提交给机器人，然后它将 SQL 查询提交给数据库。我知道应该使用 Webhook/Fulfillment and Integration，但问题是如何。

直到现在，我都尝试在 Fulfillment/Inside Editor 中通过放置...

const pg = require('pg');
const connectionString = process.env.DATABASE_URL || 'postgres://un:pass@localhost:5432/postgres';
const client = new pg.Client(connectionString);
client.connect();
const query = client.query('CREATE TABLE items(id SERIAL PRIMARY KEY, text VARCHAR(40) not null, complete BOOLEAN)');
    query.on('end', () => { client.end(); });

...进入 index.js。此外，在尝试使用 Google Assistant 时，我总是会收到 Webhook 错误，但没有任何指示性解释：

textPayload: "MalformedResponse: Webhook error (206)"  

我不想将机器人连接到其他中间网站；聊天机器人应该能够自己进行查询和检查数据库。

有人对我有什么建议吗？ 谢谢！

日志摘录如下：

7:10:03.013 PM
dialogflowFirebaseFulfillment
Ignoring exception from a finished function
7:10:02.995 PM
dialogflowFirebaseFulfillment
Function execution took 10 ms, finished with status code: 200
7:10:02.986 PM
dialogflowFirebaseFulfillment
Billing account not configured. External network is not accessible and quotas are severely limited. Configure billing account to remove these restrictions
7:10:02.986 PM
dialogflowFirebaseFulfillment
Function execution started
7:09:49.540 PM
dialogflowFirebaseFulfillment
Ignoring exception from a finished function
7:09:48.543 PM
dialogflowFirebaseFulfillment
Function execution took 865 ms, finished with status code: 200
7:09:47.678 PM
dialogflowFirebaseFulfillment
Billing account not configured. External network is not accessible and quotas are severely limited. Configure billing account to remove these restrictions
7:09:47.678 PM
dialogflowFirebaseFulfillment
Function execution started
7:09:12.659 PM
dialogflowFirebaseFulfillment
Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail
7:08:41.442 PM
dialogflowFirebaseFulfillment
Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail
7:04:51.279 PM
dialogflowFirebaseFulfillment
Ignoring exception from a finished function
7:04:51.238 PM
dialogflowFirebaseFulfillment
Function execution took 896 ms, finished with status code: 200
7:04:50.343 PM
dialogflowFirebaseFulfillment
Billing account not configured. External network is not accessible and quotas are severely limited. Configure billing account to remove these restrictions
7:04:50.343 PM
dialogflowFirebaseFulfillment
Function execution started
7:04:33.195 PM
dialogflowFirebaseFulfillment
Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail

Answer 1

我最近写了一篇关于将 MongoDB 与 Dialogflow here 连接起来的文章。

正如我之前所说，您将无法连接到在 localhost:5432 上运行的 Postgres 的本地实例（localhost:8080 上的 MySQL 也不行）。 您必须使用 托管 Postgres 服务，例如 ElephantSQL（也适用于除 Firebase/Firestore 之外的其他数据库。）

现在朝着你的答案前进， 首先，认真对待这条日志消息很重要：

未配置结算帐号。外部网络无法访问并且 名额受到严格限制。配置结算帐户以删除这些 限制

要解决这个问题，非常重要您使用计费帐户，例如，firebase 的 Blaze 计划来访问外部网络（在您的情况下是作为服务托管的数据库）请参阅 @987654323 @。

代码

'use strict';

const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');

const pg = require('pg');
const connectionString = process.env.DATABASE_URL || 'postgres://fsdgubow:K4R2HEcfFeYHPY1iLYvwums3oWezZFJy@stampy.db.elephantsql.com:5432/fsdgubow';
const client = new pg.Client(connectionString);
client.connect();
//const query = client.query('CREATE TABLE items(id SERIAL PRIMARY KEY, text VARCHAR(40) not null, complete BOOLEAN)');

});

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
  console.log('Dialogflow Request body: ' + JSON.stringify(request.body));

  function welcome(agent) {

     const text = 'INSERT INTO items(text, complete) VALUES($1, $2) RETURNING *'
     const values = ['some item text', '1' ]

    // insert demo in your items database
    client.query(text, values)
      .then(res => {
        console.log(res.rows[0])
        //see log for output
      })
     .catch(e => console.error(e.stack))

    // sample query returning current time...
     return client.query('SELECT NOW() as now')
           .then((res) => { 
               console.log(res.rows[0]);
               agent.add(`Welcome to my agent! Time is  ${res.rows[0].now}!`);
           })
           .catch(e => console.error(e.stack))

  }

  function fallback(agent) {
    agent.add(`I didn't understand`);
    agent.add(`I'm sorry, can you try again?`);
}

  // Run the proper function handler based on the matched Dialogflow intent name
  let intentMap = new Map();
  intentMap.set('welcome', welcome);
  intentMap.set('Default Fallback Intent', fallback);
  // intentMap.set('your intent name here', yourFunctionHandler);
  // intentMap.set('your intent name here', googleAssistantHandler);
  agent.handleRequest(intentMap);

});

ElephantSQL 控制台

Firebase 日志

Google 助理

我在这里使用 ElephantSQL 进行演示。 寻找更多queries。确保在它们之前放置 return 以成功执行并避免 "MalformedResponse: Webhook error (206)"!

希望能解答您的所有疑问。祝你好运！