Serverless Matrix Homeserver with Post-Quantum Cryptography

Cloudflare has successfully ported a complete Matrix homeserver to Cloudflare Workers, eliminating the operational burden associated with traditional deployments. The resulting serverless architecture offers zero costs when idle, low latency globally, and built-in security with post-quantum cryptography.

Key Technical Details

The implementation uses Rust, which compiles to WebAssembly, and leverages Cloudflare's Workers runtime via the workers-rs crate. The Durable Objects primitive provides strong consistency and atomicity for Matrix state resolution, replacing traditional SQL databases. The architecture maps as follows:

• Monolith: PostgreSQL for persistence, Redis for caching, filesystem for media
• Serverless: Durable Objects for storage, Workers for runtime

Practical Implications for Developers

Moving to Cloudflare Workers brings several advantages:

• Easy deployment: Deployment is simplified with wrangler deploy, eliminating the need for server provisioning, database administration, and certificate renewal.
• Usage-based costs: Costs scale to zero when idle, reducing expenses for low-traffic homeservers.
• Lower latency globally: Workers run in 300+ locations worldwide, reducing latency for users globally.
• Built-in security: Post-quantum cryptography is enabled by default, protecting Matrix homeservers from high-value targets.

Developers can view the source code and deploy their own instance directly from GitHub, taking advantage of this serverless, post-quantum Matrix homeserver architecture.