Maprox Observer Is-Packet-In-Geofence Job

Requirements

• Node.JS
• Some AMQP server (tested only with RabbitMQ, but theoretically can work with others)
• Posgresql with observer db installed there

Installation

git clone https://github.com/maprox/observer-job-geofence-presence.git
cd observer-job-geofence-presence
npm install

Run

npm start

Test

npm run eslint && npm test

Description

1. This job listens for new packets coming from the Message Broker (RabbitMQ in our case) in form of

   { "id": 290129, }

where 290129 in the example above is a packet id which has been recently received and added to the observer database.

2. When such packet received, the job loads all available geofences (should be refactored when number of geofences exceeds 10,000) and

3. Over each geofence it checks if the packet is in or not, and updates database records accordingly.

4. Finally it sends original message to notification channel (to proceed with geofence entrance/leaving notifications).

   { "id": 290129, }

Environment variables

• AMQP_CONNECTION [amqp://guest:[email protected]//] - AMQP connection string
• AMQP_EXCHANGE - exchange name in AMQP server.
• AMQP_QUEUE_NAME - AMQP queue name to listen for messages
• AMQP_QUEUE_ROUTING_KEY - Routing key for the queue
• AMQP_NOTIFICATION_EXCHANGE - AMQP exchange for sending notifications
• AMQP_NOTIFICATION_ROUTING_KEY - Routing key for sending notifications
• AMQP_MESSAGES_COUNT_LIMIT - Limit messages count consumed by the channel at once
• PGHOST - Postgres host
• PGDATABASE - Postgres database
• PGUSER - Postgres username
• PGPASSWORD - Postgres password

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