🚀 Requester

Consume messages (Request) from RabbitMQ, execute requests and put the response in other queue.

Install

$ brew install node
$ npm install pm2 -g
$ brew install yarn
$ npm install eslint eslint-config-airbnb --global

Configuration

All configuration is ready in config/config.js file. This config file use environment variables loaded by pm2 using file dev_ecosystem.config.js (see section Process management PM2)

Note: In production these environment variables will be already loaded in production machines

Example:

module.exports = {
    "rabbitConnection": {
        "port": process.env.RABBITMQ_PORT,
        "host": process.env.RABBITMQ_HOST,
        "vhost": process.env.RABBITMQ_VHOST,
        "login": process.env.RABBITMQ_USER,
        "password": process.env.RABBITMQ_PASSWORD,
        "noDelay": true,
        "connectionTimeout": 10000,
        "heartbeat": 60
    },
    "statsdConnection": {
        "host": process.env.STATSD_HOST,
        "port": process.env.STATSD_PORT
    },
    "exchange": {
        "name": "exchange-name",
        "routingKeyIn": "rounting-name",
        "routingKeyOut": "routing-name",
        "options": {
            "type" : "topic",
            "passive": false,
            "durable": false,
            "autoDelete": false
        }
    },
    "publisher": {
        "options": {
            "contentType": "text/plain"
        }
    },
    "originQueue": {
        "name": "queue-name",
        "options": {
            "passive": true,
            "durable": false,
            "exclusive": false,
            "autoDelete": false,
            "closeChannelOnUnsubscribe": false
        }
    }
}

Code Style Code Style airbnb

See https://github.com/airbnb/javascript

Setup airbnb in webstorm/phpstorm:

https://www.themarketingtechnologist.co/eslint-with-airbnb-javascript-style-guide-in-webstorm/

Check possible bugs in your dependencies

npm run-script checkDependencies

Start application

$ yarn install
$ npm start # Alias: pm2 start pm/dev_ecosystem.config.js (see packaje.json)

Execute tests

npm test

Commands overview

Examples environment dev (similar to environment prod)

# Install dependencies:
$ yarn install

# Execute tests
$ npm test

# Run cluster in environment dev:
$ pm2 start pm/dev_ecosystem.config.js

# Status cluster
$ pm2 status

# Kill workers cluster
$ pm2 kill

# Check bugs in the dependencies
$ npm run-script checkDependencies

# ...

Process management PM2

$ npm install pm2 -g            # Install PM2 (see Install section)

More about PM2

• Application Declaration via JS files
• Watch & Restart
• PM2 API
• Deployment workflow
• PM2 on Heroku/Azure/App Engine
• PM2 auto completion
• Using PM2 in ElasticBeanStalk
• PM2 Tutorial Series

PERFORMANCE RABBITMQ

• The number of consumers that can consume the message is too low (I assume you use a pool of consumers)
• The network is too slow
• The queues and messages are replicated between too many nodes of Rabbit MQ and go do disk (its possible to use rabbit mq like this)
• The consumer can't really handle a message and it gets constantly re-queued

CHANGELOG

CHANGELOG