WeakAppSolution

Event-driven platform that polls a legacy meter API, processes sensor events through RabbitMQ, stores them in PostgreSQL, and shows them on a React dashboard (GraphQL + live SignalR updates).

Architecture

WeakApp ──► DataIngestor ──► RabbitMQ ──► DataProcessor ──► PostgreSQL
                                  │                              │
                                  └──► NotificationService       │
                                            │                    │
                                            ▼                    ▼
                                     SignalR hub          GraphqlGateway
                                            │                    │
                                            └────────┬───────────┘
                                                     ▼
                                          sensor-dashboard-client

Component	Role
WeakApp	Legacy HTTP API (GET /meters)
DataIngestorService	Polls WeakApp, publishes events to RabbitMQ
DataProcessorService	Consumes events, persists to PostgreSQL
NotificationService	Broadcasts events to clients via SignalR
GraphqlGateway	GraphQL API over PostgreSQL
sensor-dashboard-client	React dashboard (tables, charts, live updates)

Tech stack

.NET 10 · MassTransit · RabbitMQ · PostgreSQL · HotChocolate · SignalR · React / Vite / TypeScript · Docker Compose · Serilog · Prometheus / Grafana

Prerequisites

• Docker & Docker Compose
• .NET 10 SDK and Node.js 20+ (for local development)
• GitHub Packages token with read:packages (for private NuGet restore)

cp .env.example .env
# set NUGET_TOKEN in .env

Quick start

docker compose up --build -d

What	URL
Dashboard	http://localhost:5173
GraphQL	http://localhost:6062/graphql
SignalR hub	http://localhost:2000/hubs/sensors
RabbitMQ UI	http://localhost:15672 (guest / guest)
Adminer	http://localhost:5050
Grafana	http://localhost:3000 (admin / admin)
WeakApp	http://localhost:8080 (X-Api-Key: supersecret)

docker compose down

Local development

# Backend (example)
dotnet restore
dotnet build
dotnet test
dotnet run --project DataIngestorService/DataIngestorService

# Frontend
cd sensor-dashboard-client
npm install
npm run dev    # proxies /graphql and /hubs
npm test

More details for the SPA: sensor-dashboard-client/README.md.

Repository layout

WeakApp/                     Legacy meter API
DataIngestorService/         Poller + shared contracts + messaging
DataProcessorService/        Consumer + EF Core DAL
NotificationService/         SignalR broadcaster
GraphqlGateway/              GraphQL API
sensor-dashboard-client/     React UI
.github/workflows/           CI per service
docker-compose.yml