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Components Overview

Components are the infrastructure building blocks of your Aegis Stack application. Each component provides a specific capability like API serving, background tasks, or data persistence.

Components vs Services

Components = Infrastructure capabilities (database, workers, scheduling) Services = Business functionality (auth, payments, AI integrations)

See Services Overview for business-level features.

Evolving Your Stack

Your choices aren't permanent. Components can be added or removed as your requirements change.

Unlike most starters that lock you in at init, Aegis Stack lets you evolve:

  • Add components: aegis add scheduler --project-path ./my-api
  • Remove components: aegis remove scheduler --project-path ./my-api
  • Update templates: Stay current with upstream improvements

For complete workflows with real-world examples, see Evolving Your Stack →

Component Architecture

graph TB
    subgraph "Always Included"
        API[FastAPI Backend<br/>REST API + Health]
        Frontend[Flet Frontend<br/>Cross-platform UI]
        CLI[CLI Commands<br/>Management Interface]
    end

    subgraph "Optional Infrastructure"
        Scheduler[Scheduler<br/>APScheduler Jobs]
        Database[Database<br/>SQLite / PostgreSQL]
        Worker[Worker Queues<br/>arq / Dramatiq / TaskIQ]
        Ingress[Ingress<br/>Traefik Proxy]
        Observability[Observability<br/>Logfire]
        Cache[Cache Layer<br/>Redis Sessions]
    end

    API --> Frontend
    API --> CLI

    Scheduler -.->|persistence| Database
    Worker -.->|requires| Cache
    Scheduler -.->|backup job| Database

    style API fill:#e8f5e8
    style Frontend fill:#fff3e0  
    style CLI fill:#e1f5fe
    style Scheduler fill:#f3e5f5
    style Database fill:#f3e5f5
    style Worker fill:#e8f5e8
    style Ingress fill:#e1f5fe

Component Deployment

Understanding how components deploy and scale is crucial for architectural decisions:

graph TB
    subgraph "Multi-Container Architecture"
        A0[Ingress<br/>Traefik Proxy]
        A1[Webserver<br/>Backend + Frontend]
        A2[Scheduler<br/>Background Jobs]
        A3[Worker Pool<br/>Task Processing]
        A4[Infrastructure<br/>Redis + Database]
    end

    subgraph "Independent Scaling"
        B0[Ingress × 1]
        B1[Webserver × N]
        B2[Scheduler × N]
        B3[Worker × N]
        B4[Infrastructure × N]
    end

    A0 --> B0
    A1 --> B1
    A2 --> B2
    A3 --> B3
    A4 --> B4

    style A0 fill:#e1f5fe
    style A1 fill:#e8f5e8
    style A2 fill:#fff3e0
    style A3 fill:#f3e5f5
    style A4 fill:#e1f5fe
    style B0 fill:#e1f5fe
    style B1 fill:#e8f5e8
    style B2 fill:#fff3e0
    style B3 fill:#f3e5f5
    style B4 fill:#e1f5fe

Multi-Container Architecture: Each component runs in its own Docker container (via docker-compose) for isolation and maintainability.

Backend + Frontend Container: FastAPI serves the Flet UI as an integrated web app - this is an architectural choice, not a limitation.

Independent Scaling: Each service can be scaled separately based on demand using Docker Compose replicas or orchestration tools.

Available Components

Component Purpose Implementation Status
Core (Backend + Overseer + CLI) API + UI + Management FastAPI + Flet + Typer ✅ Always included
Database Data persistence, ORM SQLite or PostgreSQL + SQLModel ✅ Available
Inference Local AI model serving Ollama (Docker or external) ✅ Available
Cache Message broker, pub/sub Redis ✅ Available
Worker Background task queues arq, Dramatiq, or TaskIQ ✅ Available
Scheduler Background tasks, cron jobs APScheduler ✅ Available
Ingress Reverse proxy, TLS, routing Traefik v3 ✅ Available
Observability Tracing, metrics, logging Pydantic Logfire ✅ Available

Component Composition

Components can be combined to enable different capabilities. For detailed patterns on how components integrate with services and each other, see the Integration Patterns Reference.

Components forming your complete stack

Individual components combine to form your complete application. Database + Scheduler + Worker + Auth + AI = A unified, production-ready system.

Next: Choose your first component combination and see the integration in action:

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