Scheduling a function in Cloud Functions for Firebase

index.js

const functions = require("firebase-functions");
const request = require("request-promise");

const OPENWEATHER_APPID = "<YOUR-OPEN-WEATHER-APP-ID>";

const LINE_MESSAGING_API = "https://api.line.me/v2/bot/message";
const LINE_UID = "<YOUR-LINE-ID>";
const LINE_HEADER = {
  "Content-Type": "application/json",
  Authorization:
    "Bearer <YOUR-CHANNEL-ACCESS-TOKEN>"
};

exports.scheduledFunction = functions.pubsub.schedule("* * * * *").timeZone('Asia/Bangkok').onRun((context) => {
  return request({
    method: "GET",
    uri: `https://api.openweathermap.org/data/2.5/weather?appid=${OPENWEATHER_APPID}&units=metric&type=accurate&zip=10330,th`,
    json: true
  }).then(response => {
    const message = `City: ${response.name}\nTemperature: ${response.main.temp}`;
    return request({
      method: "POST",
      uri: `${LINE_MESSAGING_API}/push`,
      headers: LINE_HEADER,
      body: JSON.stringify({
        to: LINE_UID,
        messages: [
          {
            type: "text",
            text: message
          }
        ]
      })
    }).then(() => {
      return console.info("Done");
    }).catch(error => {
      return Promise.reject(error);
    });
  })
});