bensooraj

package main

import (
	"fmt"
	"time"
)

func main() {
	doWork := func(done <-chan interface{}, strings <-chan string) <-chan interface{} {
		completed := make(chan interface{})

bensooraj

// Relevant samples: https://github.com/ibm-messaging/mq-dev-patterns/tree/master/Node.js

require('dotenv').config();

console.log("Environment variables: ", process.env);

const fs = require("fs");

const mq = require('ibmmq'); // import the package containing the MQI library
const MQC = mq.MQC; // refer to constant values exported by the package.

bensooraj

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

bensooraj

// Imports the Google Cloud client library
const vision = require('@google-cloud/vision');
// Creates a client
const client = new vision.ImageAnnotatorClient();
// Uploaded image, available in base64Image format,
// is converted to a Buffer
let imageBuffer = Buffer.from(req.body.base64Image, 'base64');

// Call the Cloud Vision client, to detect text
client

bensooraj

<div class="contactemail" style="margin-bottom: 25px;">

bensooraj

upstream node_cluster {  
    server 127.0.0.1:3000;      # Node.js instance 1
    server 127.0.0.1:3001;      # Node.js instance 2
    server 127.0.0.1:3002;      # Node.js instance 3
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    

bensooraj

#user  nobody;
worker_processes  1;

error_log  logs/error.log;
error_log  logs/error.log  notice;
error_log  logs/error.log  info;

#pid        logs/nginx.pid;

bensooraj

# To run multiple instances of a node app run on different ports on the localhost
PORT=3001 pm2 start bin/www -f

┌──────────┬────┬──────┬──────┬────────┬─────────┬────────┬─────┬───────────┬───────────┬──────────┐
│ App name │ id │ mode │ pid  │ status │ restart │ uptime │ cpu │ mem       │ user      │ watching │
├──────────┼────┼──────┼──────┼────────┼─────────┼────────┼─────┼───────────┼───────────┼──────────┤
│ www      │ 0  │ fork │ 4697 │ online │ 0       │ 16s    │ 0%  │ 34.4 MB   │ Bensooraj │ disabled │
│ www      │ 1  │ fork │ 4704 │ online │ 0       │ 0s     │ 0%  │ 13.0 MB   │ Bensooraj │ disabled │
└──────────┴────┴──────┴──────┴────────┴─────────┴────────┴─────┴───────────┴───────────┴──────────┘

bensooraj

const pg = require('pg')

// create a config to configure both pooling behavior
// and client options
// note: all config is optional and the environment variables
// will be read if the config is not present
var config = {
  user: '', // env var: PGUSER
  database: '', // env var: PGDATABASE
  password: '', // env var: PGPASSWORD