DYSCHAT

This repository contains the source code for the DYSCHAT project. The project is a distributed chat application that allows users to communicate with each other in real time. The application is built using NATS JetStream as the messaging system and persistence layer. The application is built using the following technologies:

Messaging System & Persistence Layer

• NATS JetStream
• NATS Go Client

Monitoring

• Prometheus
• Grafana
• Jaeger
• OpenTelemetry
• OpenTelemetry Go Client

Getting Started

Prerequisites

• Docker
• Docker Compose
• Go

Running the Application

1. Clone the repository
2. Run make run_<mode> where <mode> is one of the following:
   • dev: Runs the application in development mode
   • prod: Runs the application in production mode

Running the Tests

1. Clone the repository
2. Run make test
3. Run make test_coverage to generate a coverage report

Architecture

The application is composed of the following services:

Common

These environment variables are used by all services.

Name	Description	Default Value
DYSCHAT_ENV_MODE	The environment mode for the application	dev
DYSCHAT_NATS_URL	The URL of the NATS server to consume messages from	nats://localhost:4222
DYSCHAT_JAEGER_URL	The URL of the Jaeger server	http://localhost:14268/api/traces
DYSCHAT_PROMETHEUS_ADDR	The address of the Prometheus server	localhost:9090
DYSCHAT_GRAFANA_ADDR	The address of the Grafana server	localhost:3000
DYSCHAT_REDIS_ADDR	The address of the Redis server	localhost:6379
DYSCHAT_REDIS_PASS	The password for the Redis server	``
DYSCHAT_REDIS_DATABASE	The database for the Redis server	0

Authentication Service

This service is responsible for authenticating users and generating JWT tokens.

Name	Description	Default Value
DYSCHAT_AUTH_GRPC_PORT	The address of the authentication service gRPC server	localhost:50051
DYSCHAT_AUTH_SECRET	The secret used to sign JWT tokens	secret
DYSCHAT_AUTH_AUTH_LOG_LEVEL	The log level for the authentication service	info

Message Writer Service

This service is responsible for writing messages to the database. It listens for messages sent to a Room and writes them to the database.

Name	Description	Default Value
DYSCHAT_MSG_WRITER_ENV_MODE	The environment mode for the message writer service	dev
DYSCHAT_MSG_WRITER_LOG_LEVEL	The log level for the message writer service	info

Rooms Service

This service is responsible for managing the rooms.

Name	Description	Default Value
DYSCHAT_ROOMS_GRPC_PORT	The address of the rooms service gRPC server	localhost:50052
DYSCHAT_ROOMS_LOG_LEVEL	The log level for the rooms service	info

Websocket Agent Service

This service exposes a websocket endpoint that allows to receive and send messages in real time to a room.

Name	Description	Default Value
DYSCHAT_WS_AGENT_PORT	The address of the websocket agent service	localhost:50053
DYSCHAT_WS_AGENT_LOG_LEVEL	The log level for the websocket agent service	info