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Chat21 Real Time messaging engine is a simple "observer" on RabbitMQ Message Brocker.
Chat21 Client Applications use MQTT protocol to connect to RabbitMQ. Each end-user writes outoging messages on a specific path where his RabbitMQ JWT Token allows him to write.
MQTT Outgoing path example:
/apps/tilechat/users/USER-ID/RECIPIENT-USER-ID/messages/outgoing
The Client application connected with MQTT to RabbitMQ, sends the message as a JSON payload to the /outgoing path.
The observer subscribes himself to these paths. As soon as he gets notified of an outgoing message the same message payload is forwarded (AMQP publish operation) to the recipient path:
/apps/tilechat/users/RECIPIENT-USER-ID/SENDER-USER-ID/messages/clientadded
The recipient will receive the MQTT publish notification on the incoming path decoding it as a new message based on the final part of the path, that always indicates the type of operation on that path:
/clientadded = new payload (a message) arrived on the path.
Using this observer Chat21 implements the "inbox" concept. Messages are not delivered directly with shared path between the two clients, but rather delivered through this observer who can take additional actions to improve privacy, security, persistence and apply other policies on messages (i.e. blocking users).
Moreover, a granular security can be applied with the "inbox" pattern, using RabbitMQ JWT Tokens specification, where a user can only read and write on his own, specific paths, never reading or writing directly on other users inboxes.
The inbox pattern just works like email SMTP/POP3 protocols. The message is sent from the user to his own SMTP server inbox (the /outgoing path), as an outgoing message. The "observer" (this application), gets the message and sends it to the recipient's SMTP server (the recipient inbox path) with a /clientadded action where the recipient itself will receive the message as soon as he connects to RabbitMQ through MQTT.
docker build -t chat21/chat21-server:dev .
docker push chat21/chat21-server:dev
docker run chat21/chat21-server:dev