Clear cache automaticly

2 files changed, 40 insertions, 16 deletions

diff --git a/lib/getUserIndex.js b/lib/getMeetingpointData.js
index 393eab0..fb4c6e4 100644
--- a/lib/getUserIndex.js
+++ b/lib/getMeetingpointData.js
@@ -5,8 +5,8 @@ const cheerio = require('cheerio')
 const _ = require('lodash')
 const request = Promise.promisify(require('request'))
 
-exports = {}
-module.exports = exports
+let meetingpointData
+let lastUpdate
 
 function getUsers (page) {
   const script = page('script').eq(1).text()
@@ -57,16 +57,35 @@ function getValidWeekNumbers(page) {
 }
 
 function requestData() {
+  lastUpdate = new Date()
+
   return request(`http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/frames/navbar.htm`).then((response) => {
     const page = cheerio.load(response.body)
     const users = getUsers(page)
     const validWeekNumbers = getValidWeekNumbers(page)
 
-    return { users, validWeekNumbers }
+    meetingpointData = { users, validWeekNumbers }
+
+    return meetingpointData
   })
 }
 
-requestData().then(({ users, validWeekNumbers }) => {
-  exports.users = users
-  exports.validWeekNumbers = validWeekNumbers
-})
+function getMeetingpointData () {
+  if (lastUpdate == null) {
+    return requestData()
+  } else if (!meetingpointData) {
+    // The first request hasn't resolved yet, throw an error.
+    return Promise.reject()
+  } else if (new Date() - lastUpdate > 10 * 60 * 1000) { // 10 minutes
+    return requestData().catch(function () {
+      console.warn('Unable to update userIndex, using cached.')
+
+      return meetingpointData
+    })
+  }
+   else {
+    return Promise.resolve(meetingpointData)
+  }
+}
+
+module.exports = getMeetingpointData
diff --git a/routes/index.js b/routes/index.js
index 570fe5f..68f29b7 100644
--- a/routes/index.js
+++ b/routes/index.js
@@ -2,19 +2,24 @@
 
 const express = require('express')
 const router = express.Router()
-const data = require('../lib/getUserIndex')
+const getMeetingpointData = require('../lib/getMeetingpointData')
 
 /* GET home page. */
 router.get('/', function (req, res, next) {
-  let flags = []
-  if (req.query.nfd != null) {
-    flags.push('NO_FEATURE_DETECT')
-  }
+  getMeetingpointData().then(data => {
+    let flags = []
+    if (req.query.nfd != null) {
+      flags.push('NO_FEATURE_DETECT')
+    }
 
-  const flagsStr = `var FLAGS = ${JSON.stringify(flags)};`
-  const usersStr = `var USERS = ${JSON.stringify(data.users)};`
-  const validWeekNumbersStr = `var VALID_WEEK_NUMBERS = ${JSON.stringify(data.validWeekNumbers)}`
-  res.render('index', { flagsStr, usersStr, validWeekNumbersStr })
+    const flagsStr = `var FLAGS = ${JSON.stringify(flags)};`
+    const usersStr = `var USERS = ${JSON.stringify(data.users)};`
+    const validWeekNumbersStr = `var VALID_WEEK_NUMBERS = ${JSON.stringify(data.validWeekNumbers)}`
+    res.render('index', { flagsStr, usersStr, validWeekNumbersStr })
+  }).catch(function () {
+    console.error('Unable to get user info, emergency redirect!')
+    res.redirect('http://www.meetingpointmco.nl/Roosters-AL/doc/')
+  })
 })
 
 module.exports = router