CacheFlow

CacheFlow is a lightweight HTTP caching reverse proxy written in Go, designed for high-latency, unreliable network environments.

⚠️ Sprint 0 Foundation Status: This repository contains the foundation structure only. No business logic is implemented yet.

🎯 Sprint 0 - Foundation Complete

✅ Repository Structure: Complete Go project layout
✅ Tooling: Makefile, linting, and build system
✅ Documentation: Architecture and context documentation
✅ Development Ready: Ready for Sprint 1 feature development

📁 Project Structure

cacheflow/
├── cmd/
│   └── serve/
│       └── main.go
│
├── internal/
│   ├── cache/
│   │   ├── cache.go
│   │   └── lru.go
│   │
│   ├── proxy/
│   │   └── proxy.go
│   │
│   ├── middleware/
│   │   └── cache.go
│   │
│   ├── config/
│   │   └── config.go
│   │
│   └── server/
│       └── server.go
│
├── docs/
│   └── ETHIOPIAN_CONTEXT.md
│
├── ARCHITECTURE.md
├── README.md
├── Makefile
├── .golangci.yml
├── go.mod
└── go.sum

🛠️ Development

Prerequisites

• Go 1.21+
• golangci-lint for linting

Installation

git clone https://github.com/asmareadmasu/cacheflow.git
cd cacheflow
make install-dev

Commands

make build    # Build the application
make test     # Run tests
make lint     # Run linters
make run      # Run the application
make clean    # Clean build artifacts
make help     # Show all available commands

Linting

Configured linters:

• govet - Go vet
• errcheck - Error checking
• staticcheck - Static analysis
• ineffassign - Ineffective assignment detection

📋 Sprint 0 Definition of Done

• ✅ Repository structure matches specification
• ✅ make test and make lint pass
• ✅ README and ARCHITECTURE.md exist
• ✅ No feature or business logic implemented
• ✅ Clean, professional Go repository ready for Sprint 1

📖 Documentation

• ARCHITECTURE.md: System design, interfaces, and trade-offs
• docs/ETHIOPIAN_CONTEXT.md: Ethiopian network context and optimization rationale

🎯 Success Metrics (Sprint 1 Targets)

• Cache hit latency < 5ms
• ≥ 95% cache hit rate on repeat requests
• 1 upstream call per concurrent cache miss
• Serve stale data on upstream failure

🇪🇹 Ethiopian Context

CacheFlow is optimized for regions with:

• High latency networks (500ms-2s RTT)
• Expensive mobile data ($0.50-$2.00/GB)
• Intermittent connectivity
• Power instability

See docs/ETHIOPIAN_CONTEXT.md for detailed engineering analysis.

🚀 Next Steps

Sprint 1 will implement:

• Cache layer with LRU eviction
• HTTP proxy with request forwarding
• Middleware for caching logic
• Metrics and observability

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Built with ❤️ for high-latency, bandwidth-constrained environments