⚡ GO-Gateway

An API Gateway built from scratch in Go — no framework, just net/http, MySQL, and Redis.

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🚀 What It Does

🧭 Dynamic Routing	Matches requests to backend services by path & method, wildcards included
🔐 JWT Authentication	Login issues a token; protected routes enforce role-based access
⚖️ Weighted Load Balancing	Smooth weighted round-robin across multiple backend instances
💓 Live Health Checks	Background scheduler pulls unhealthy targets out of rotation automatically
⚡ Redis Caching	Per-route response caching with configurable TTL
🛑 Rate Limiting	Token-bucket limiting per client, configurable per route
🌐 CORS Handling	Configurable allowed origins, methods, headers
🔄 Hot-Reloadable Config	Routing rules update live from YAML — zero restarts
🗄️ MySQL User Store	Real login flow, bcrypt-hashed passwords

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🧩 How a Request Flows Through It

flowchart TD
    A["🌍 Incoming Request"] --> B["🌐 CORS Middleware"]
    B --> C["📝 Logger Middleware"]
    C --> D["🔐 JWT Auth Middleware"]
    D --> E["🛑 Rate Limiter"]
    E --> F{"⚡ Cached in Redis?"}
    F -- "Yes" --> G["✅ Return Cached Response"]
    F -- "No" --> H["⚖️ Weighted Round-Robin"]
    H --> I{"💓 Target Healthy?"}
    I -- "No" --> H
    I -- "Yes" --> J["➡️ Reverse Proxy to Backend"]
    J --> K["💾 Cache Response (if enabled)"]
    K --> L["📤 Response to Client"]

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🏗️ Under the Hood

flowchart LR
    subgraph Client
        U["Client / Browser"]
    end

    subgraph Gateway["⚡ GoGateway"]
        R["Router"]
        MW["Middleware Stack<br/>CORS · Auth · Rate Limit · Logging"]
        LB["Load Balancer<br/>Weighted Round-Robin"]
        HC["Health Checker<br/>Cron Scheduler"]
    end

    subgraph Data["Data Layer"]
        DB[("🗄️ MySQL<br/>Users")]
        RD[("⚡ Redis<br/>Cache")]
    end

    subgraph Backends["Backend Services"]
        S1["Service A"]
        S2["Service B"]
        S3["Service C"]
    end

    U --> R --> MW --> LB
    LB --> S1
    LB --> S2
    LB --> S3
    HC -.monitors.-> S1
    HC -.monitors.-> S2
    HC -.monitors.-> S3
    MW <--> DB
    MW <--> RD

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