Runtime Library

The runtime library provides context-based goroutine management and signal handling for Go programs. It is designed to facilitate graceful shutdowns and handle specific signals like SIGPIPE when running as a systemd service.

Features

• Context-based Goroutine Management: Manage goroutines with a base context that can be canceled, ensuring all goroutines are properly cleaned up.
• Signal Handling: Handle SIGPIPE signals to prevent program crashes when running as a systemd service.
• Graceful Shutdown: Provides mechanisms to gracefully stop and cancel running goroutines.

Installation

To install the runtime library, add it to your go.mod file:

go get github.com/yourusername/runtime

Usage

Example of using the runtime for gracefully shutting down goroutines with a default Environment

package main

import (
	"context"
	"github.com/imunhatep/runtime"
	"log"
)

func main() {
	// If a goroutine started by Go returns non-nil error,
	// the framework calls env.Cancel(err) to signal other
	// goroutines to stop soon.
	runtime.Go(func(ctx context.Context) error {
        // Simulate work
        <-ctx.Done()
        log.Println("Goroutine stopped")
        return nil
	})

	// Stop declares no more Go is called.
	// This is optional if env.Cancel will be called
	// at some point (or by a signal).
	runtime.Stop()

	// Wait returns when all goroutines return.
	runtime.Wait()
}

Creating an Environment

Create a new Environment to manage goroutines:

package main

import (
    "context"
    "github.com/yourusername/runtime"
)

func main() {
    env := runtime.NewEnvironment(context.Background())
    // Use the environment to manage goroutines
}

Starting Goroutines

Use the Go method to start a goroutine within the environment:

env.Go(func(ctx context.Context) error {
    // Your goroutine logic here
    <-ctx.Done() // Watch for cancellation
    return nil
})

Graceful Shutdown

To gracefully stop all goroutines, call the Stop or Cancel methods:

// Stop the environment (no new goroutines will be started)
env.Stop()

// Cancel the environment with an error
env.Cancel(nil)

// Wait for all goroutines to finish
err := env.Wait()
if err != nil {
    // Handle the error
}

Example with environment

Here is a complete example demonstrating the usage of the runtime library:

package main

import (
    "context"
    "github.com/imunhatep/runtime"
    "log"
)

func main() {
    env := runtime.NewEnvironment(context.Background())

    env.Go(func(ctx context.Context) error {
        // Simulate work
        <-ctx.Done()
        log.Println("Goroutine stopped")
        return nil
    })

    // Simulate a signal to stop the environment
    env.Stop()

    // Wait for all goroutines to finish
    if err := env.Wait(); err != nil {
        log.Fatalf("Error: %v", err)
    }

    log.Println("All goroutines have finished")
}