add Python server backend

server-node/index.ts

@@ -0,0 +1,104 @@
+import dotenv from 'dotenv'
+import express from 'express'
+import type { Request, Response } from 'express'
+import mongo from 'mongodb'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+dotenv.config()
+
+console.log('Starting with parameters:')
+console.table(
+  ['MONGO_SERVER', 'MONGO_DB'].map((parameter) => {
+    return {
+      parameter,
+      value: process.env[parameter]
+    }
+  })
+)
+const app = express()
+
+app.listen(3000, () => {
+  console.log('Listening on ' + 3000)
+})
+
+let db: mongo.Db
+
+async function connectToMongo() {
+  try {
+    const mongoUrl = `mongodb://${process.env.MONGO_SERVER}:27017`
+    const client = await mongo.MongoClient.connect(mongoUrl)
+    db = client.db(process.env.MONGO_DB)
+    console.log('Connected succesfully to server')
+  } catch (e) {
+    console.log(e)
+    setTimeout(connectToMongo, 5000)
+  }
+}
+
+connectToMongo()
+
+function objectIdFromDate(date: Date) {
+  return new mongo.ObjectId(Math.floor(date.getTime() / 1000).toString(16) + '0000000000000000')
+}
+
+app.use(function (req: Request, res: Response, next) {
+  res.header('Access-Control-Allow-Origin', '*')
+  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
+  next()
+})
+
+app.get('/type/:type/startDate/:startDate/endDate/:endDate/sample/:sample', async (req: Request, res: Response) => {
+  const startDate = new Date(parseInt(req.params.startDate) * 1000)
+  const endDate = new Date(parseInt(req.params.endDate) * 1000)
+  const sample = parseInt(req.params.sample)
+  const type = req.params.type
+  const agg = [
+    {
+      $match: {
+        $and: [
+          { _id: { $gt: objectIdFromDate(startDate), $lt: objectIdFromDate(endDate) } },
+          { type },
+          { value: { $ne: NaN } }
+        ]
+      }
+    },
+    {
+      $group: {
+        _id: {
+          $toDate: {
+            $subtract: [
+              { $toLong: { $toDate: '$_id' } },
+              { $mod: [{ $toLong: { $toDate: '$_id' } }, 1000 * 60 * sample] }
+            ]
+          }
+        },
+        value: { $avg: '$value' },
+        date: { $min: { $toDate: '$_id' } }
+      }
+    },
+    {
+      $project: {
+        _id: 0,
+        value: { $round: ['$value', 1] },
+        date: { $toLong: '$date' }
+      }
+    },
+    { $sort: { date: 1 } }
+  ]
+  try {
+    const docs = await db.collection('dht22').aggregate(agg).toArray()
+    res.json(docs)
+  } catch (err) {
+    console.log(err)
+  }
+})
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
+app.use(express.static(path.join(__dirname, '../dist')))
+
+app.get('/*', function (req: Request, res: Response) {
+  res.sendFile(path.join(__dirname, '../dist/index.html'))
+})