89 lines
2.8 KiB
JavaScript
89 lines
2.8 KiB
JavaScript
const { MongoClient } = require("mongodb");
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const express = require('express');
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const minio = require('minio');
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/*============== VARIABLE DECLARATION ==============*/
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// Mongo set-up variables
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const mongoCollection = process.env.MONGO_COLLECTION || 'eventlog';
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const mongoUri = process.env.MONGO_URI || 'mongodb://127.0.0.1:27017/default?replicaSet=rs0';
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// Minio set-up variables
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const minioURI = new URL(process.env.MINIO_URI || 'http://kspace-mugshot:2mSI6HdbJ8@127.0.0.1:9000/kspace-mugshot');
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const minioBucket = minioURI.pathname.substring(1);
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const historyNumber = parseInt(process.env.HISTORY_AMOUNT) || 1000;
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// Stream set-up variables
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let changeStream;
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const options = { fullDocument: "updateLookup" };
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const pipeline = [];
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const PORT = process.env.PORT || 3002;
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// Create Mongo client
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const mongoClient = new MongoClient(mongoUri);
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/*============== CODE ==============*/
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async function run() {
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console.log('server.js has been launched');
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const app = express();
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await mongoClient.connect();
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const collection = mongoClient.db().collection(mongoCollection);
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let eventArray = [];
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changeStream = collection.watch(pipeline, options);
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console.log("Started watching changes in database");
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// Triggers on GET at /event route
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app.get('/events', async function (request, response) {
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let minioClient = new minio.Client({
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endPoint: minioURI.hostname,
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port: parseInt(minioURI.port) || (minioURI.protocol == 'https' ? 443 : 80),
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useSSL: minioURI.protocol == 'https',
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accessKey: minioURI.username,
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secretKey: minioURI.password
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});
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// Notify SSE to React
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const header = { 'Content-Type': 'text/event-stream', 'Connection': 'keep-alive' };
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response.writeHead(200, "OK", header);
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response.write('Connection established \n\n');
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const historyCursor = collection.find({}).sort({$natural : -1}).limit(historyNumber);
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historyCursor.forEach((document) => {
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const stringFormat = JSON.stringify(document);
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eventArray = [stringFormat, ...eventArray];
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})
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response.write(`event: events, data: [${[...eventArray]}]\n\n`)
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changeStream.on("change", data => {
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let document = JSON.stringify(data.fullDocument);
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eventArray = [document];
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if (data.fullDocument.screenshot_count) {
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for (let i = 1; i <= data.fullDocument.screenshot_count ; i++) {
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minioClient.presignedUrl('GET', minioBucket, `${data.fullDocument.camera}/${data.fullDocument._id}/${i}.jpg`, 60 * 60, (err, presignedUrl) => {
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if (err) { return console.log(err) };
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const realURL = JSON.stringify({ picUrl: presignedUrl });
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eventArray = [realURL, ...eventArray];
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})
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}
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};
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response.write(`data: [${[...eventArray]}]\n\n`);
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});
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});
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app.listen(PORT);
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console.log(`Server listening at 127.0.0.1:${PORT}`);
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}
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run().catch(console.dir);
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