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| // fixed version of https://javascript.plainenglish.io/introduction-to-redis-and-caching-with-node-js-using-upstash-88efbe39eea2 | |
| import express from 'express' | |
| import mongoose from 'mongoose' | |
| import bodyParser from 'body-parser' | |
| import { createClient } from 'redis' | |
| import { v4 as uuidv4 } from 'uuid' | |
| const app = express() | |
| app.use(bodyParser.json()) | |
| const client = createClient({ | |
| url: 'redis://:password@eu1-foo-bar-12345.upstash.io:12345', | |
| }) | |
| client.on('error', err => console.log('Redis Client Error', err)) | |
| await client.connect() | |
| mongoose.connect( | |
| 'mongodb://localhost:27017/', | |
| { | |
| dbName: 'notes', | |
| useNewUrlParser: true, | |
| useUnifiedTopology: true, | |
| family: 4, | |
| }, | |
| err => (err ? console.log(err) : console.log('Connected to database')) | |
| ) | |
| const NoteSchema = new mongoose.Schema({ | |
| title: String, | |
| note: String, | |
| }) | |
| const Note = mongoose.model('Note', NoteSchema) | |
| app.post('/api/notes', async (req, res, next) => { | |
| const { title, note } = req.body | |
| const _note = new Note({ | |
| title: title, | |
| note: note, | |
| }) | |
| _note.save((err, note) => { | |
| if (err) { | |
| return res.status(404).json(err) | |
| } | |
| const id = uuidv4() | |
| const data = JSON.stringify(req.body) | |
| try { | |
| // todo: determine how to set a timestamp on the resource | |
| // i.e. before time get redis, after get from mongo | |
| await client.set(id, data) | |
| return res.status(201).json({ | |
| message: 'Note has been saved', | |
| data: req.body, | |
| }) | |
| } catch (error) { | |
| return res.status(400).json({ | |
| message: 'redis error', | |
| }) | |
| } | |
| }) | |
| }) | |
| const isCached = (req, res, next) => { | |
| const { id } = req.params | |
| const data = await client.set(id) | |
| const reponse = JSON.parse(data) | |
| return res.status(200).json(reponse) | |
| next() | |
| } | |
| app.get('/api/notes/:id', isCached, (req, res) => { | |
| const { id } = req.params | |
| Note.findById(id, (err, note) => { | |
| if (err) { | |
| return res.status(404).json(err) | |
| } | |
| return res.status(200).json({ | |
| note: note, | |
| }) | |
| }) | |
| }) | |
| app.listen(3000, () => console.log('Server running at port 3000')) |
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