Go Contextualized Application Framework

A modular framework for building contextualized Go applications with dependency injection, service management, and common infrastructure components.

Key Components

Database Layer (db/)

• Connection management for SQLite and PostgreSQL
• Context-aware sessions with transactions
• Streaming query support with pagination
• Connection pooling and health checks
• GORM integration with Prometheus metrics
• Exceptional: Hybrid SQLite/PostgreSQL support with automatic configuration

HTTP Server (httpserver/)

• REST API framework with middleware support
• Typed request handlers with automatic JSON marshaling
• Authentication middleware (Bearer Token & Basic Auth)
• Integrated Prometheus metrics collection
• Request size limiting and timeout handling
• Exceptional: Dual-format health checks (JSON/plaintext)

Task Scheduler (scheduler/)

• Cron-style job scheduling
• Distributed locking using PostgreSQL advisory locks or in-memory locks
• Cluster-safe execution coordination
• Exceptional: Transaction-based locking for PostgreSQL backend

Monitoring (actuator/)

• Health check aggregator
• Service discovery endpoint
• Metrics endpoint for Prometheus
• Dependency tracking visualization

Utilities (utils/)

• Concurrent execution pools with semaphores
• Streaming channel patterns
• Slice manipulation helpers
• Optional type wrappers
• Exceptional: Buffered channel generators with error propagation

Getting Started

package main

import (
    "github.com/sedmess/go-ctx-base/db"
    "github.com/sedmess/go-ctx-base/httpserver"
    "github.com/sedmess/go-ctx-base/scheduler"
    "github.com/sedmess/go-ctx/ctx"
)

func main() {
    ctx.CreateContextualizedApplication(
        httpserver.Default(),
        db.Default(),
        scheduler.Default(),
        ctx.PackageOf(
            &MyController{},
            &MyService{},
        ),
    ).Join()
}

Configuration

Environment variable based configuration with service prefixes:

# HTTP Server
HTTP_LISTEN=:8080
HTTP_MAX_REQUEST_SIZE=1048576

# PostgreSQL
DB_HOST=localhost
DB_USERNAME=postgres
DB_PASSWORD=secret

# SQLite
DB_SQLITE_PATH=file::memory:

# Scheduling
SCHEDULER_LOCK_PROVIDER=POSTGRES  # or LOCAL

License

Apache 2.0 - See LICENCE for details