System Design: Architecture Design Diagram code versioning system. ( Git/Tortoise SVN/GitHub )

Full system architecture diagram for a custom version control system:

System Architecture Explanation for Custom Version Control System

1. Users

Who: Developers interacting with your system
How: Through the CLI (locally) or via the REST API (web, automation)

2. CLI / Client (Local Repo)

Purpose: Interface to interact with the VCS locally

• Staging Area: Tracks added files before commit
• Commands: init, add, status, commit, etc.
• Functionality: Reads/writes from .vcs/ folder and syncs with remote

3. REST API Gateway

Purpose: Secure entry point to your backend

• Handles authentication (JWT, OAuth2)
• Routes requests to core application server
• Applies rate limiting and logging
• Tech Stack: FastAPI / Express.js / Spring Boot

4. Core Application Server

The brain of the system — handles all version control logic:

• Commit Logic: Stores commit data
• Branch Logic: Create, move, delete branches
• Merge: 3-way merge, conflict detection
• Diff: Show changes between versions
• Rebase: Reapply commits on another branch

5. SQL Database

Purpose: Stores metadata and system-level information

• Users: Auth credentials, roles
• Repos: Repository names, owners
• Branches: Names, current commit hash
• Permissions: Access control (read/write/admin)

6. Object Storage

Purpose: Stores actual code and versioned data

• Blobs: File contents
• Trees: Directory structures
• Commits: Metadata (author, timestamp, message) pointing to trees

7. Redis Cache

Purpose: Fast-access layer to reduce DB/Object Store hits

• Caches commit diffs
• Stores branch references
• Speeds up access to recent file trees

8. Background Workers

Purpose: Handles asynchronous tasks

• Merge conflict resolution
• Indexing and compression
• Notifications (e.g., emails on push/pull)
• Triggered via message queue or job scheduler

This architecture is scalable, secure, and mirrors systems like GitHub or GitLab while being customizable for your own project.