如何使用Dialogflow建立Google Home App
#7 介紹
#8 Actions on Google 開發環境設定
#9 使用fulfilment串API
#10 release App

為了對 google Home 有完整支援，建議使用 actions-on-google 的 dialogflow元件來做，不過本篇還是先偷懶，直接倒json回去；不是啦，必竟有講說要讓不會程式的人也能用了，是吧！

https://medium.com/@wolkesau/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8dialogflow%E5%BB%BA%E7%AB%8Bchatbot-5-%E4%BD%BF%E7%94%A8fulfilment-webhook%E4%B8%B2api-b0e21689a93e

如同 #5 我將直接使用 serverless framework 來開 GCP 的cloud function.

不熟 serverless framework 的朋友，請先 follow 這個教學
https://serverless.com/framework/docs/providers/google/guide/quick-start/

hello world 開好正常運作後，直接將下面的code copy到你的index.js上。

'use strict';
const http = require('http');

exports.parking_eng = (request, response) => {
  console.log("request.body.queryResult", request.body.queryResult)
  var s = "";
  const RoadName = request.body.queryResult.parameters.RoadName;
  // console.log(RoadName);
  if (RoadName === undefined) {
    response.json({ 'fulfillmentText': "do not get this road!" });
    return
  }
  var ChineseRoadName = getChineseRoadName(RoadName);
  if (ChineseRoadName === undefined) {
    response.json({ 'fulfillmentText': "do not get this in chinese name!" });
    return
  }
  callRoadApi(ChineseRoadName).then(obj => {
    let s = "";
    if (obj.length > 0) {
      obj.map(i => {
        s += `${RoadName} get ${i.rd_count} parking space!`
      })
    } else {
      s = `${RoadName} is no parking space!`
    }
    console.log(s)
    response.json({ 'fulfillmentText': s });

  }).catch(() => {
    response.json({ 'fulfillmentText': `something fail! call me later!` });
  })
}
const { road } = require("./roadName");

var getChineseRoadName = (RoadName) => {
  // console.log(road[0].zh)
  let item;
  road.map(i => {
    console.log(i, (i.en.indexOf(RoadName) > -1))
    if (i.en.indexOf(RoadName) > -1) {
      item = i
    };
  })
  return item;

}

var callRoadApi = (roadName) => {
  return new Promise((resolve, reject) => {
    // let path = "http://data.tycg.gov.tw/api/v1/rest/datastore/27d2edc9-890e-4a42-bcae-6ba78dd3c331?format=json";
    http.get({ host: "data.tycg.gov.tw", path: "/api/v1/rest/datastore/27d2edc9-890e-4a42-bcae-6ba78dd3c331?format=json" }, (res) => {
      // http.get(path, res => {
      let body = ''; // var to store the response chunks
      res.on('data', (d) => { body += d; }); // store each response chunk
      res.on('end', () => {
        let response = JSON.parse(body);
        let records = response.result.records;
        let r = records.filter((n) => {
          if (n.rd_name.indexOf(roadName) > -1) {
            return n
          }
        })
        if (r.length > 0) {
          resolve(r)
        } else {
          console.log("fail it")
          reject()
        }
      });
      res.on('error', (error) => {
        console.log(`Error calling the weather API: ${error}`)
        reject();
      });
    })
  })
}

serverless.yaml 加這個

third:
handler: parking_eng
events:
- http: path

再 sls deploy 上去吧

產出webhook後，填至url裡。

搞定！