sal/service_manager/examples/service_spaghetti.rs

//! service_spaghetti - An example of messy service management.
//!
//! This example demonstrates how the service manager behaves when commands
//! are issued in a less-than-ideal order, such as starting a service that's
//! already running or removing a service that hasn't been stopped.

use sal_service_manager::{create_service_manager, ServiceConfig};
use std::collections::HashMap;
use std::thread;
use std::time::Duration;

fn main() {
    // Initialize logging to see socket discovery in action
    env_logger::init();

    let manager = match create_service_manager() {
        Ok(manager) => manager,
        Err(e) => {
            eprintln!("Error: Failed to create service manager: {}", e);
            return;
        }
    };
    let service_name = "com.herocode.examples.spaghetti";

    let service_config = ServiceConfig {
        name: service_name.to_string(),
        binary_path: "/bin/sh".to_string(),
        args: vec![
            "-c".to_string(),
            "while true; do echo 'Spaghetti service is running...'; sleep 5; done".to_string(),
        ],
        working_directory: None,
        environment: HashMap::new(),
        auto_restart: false,
    };

    println!("--- Service Spaghetti Example ---");
    println!("This example demonstrates messy, error-prone service management.");

    // Cleanup from previous runs to ensure a clean slate
    if let Ok(true) = manager.exists(service_name) {
        println!(
            "\nService '{}' found from a previous run. Cleaning up first.",
            service_name
        );
        let _ = manager.stop(service_name);
        let _ = manager.remove(service_name);
        println!("Cleanup complete.");
    }

    // 1. Start the service (creates and starts in one step)
    println!("\n1. Starting the service for the first time...");
    match manager.start(&service_config) {
        Ok(()) => println!("   -> Success: Service '{}' started.", service_name),
        Err(e) => {
            eprintln!(
                "   -> Error: Failed to start service: {}. Halting example.",
                e
            );
            return;
        }
    }

    thread::sleep(Duration::from_secs(2));

    // 2. Try to start the service again while it's already running
    println!("\n2. Trying to start the *same service* again...");
    match manager.start(&service_config) {
        Ok(()) => println!("   -> Unexpected Success: Service started again."),
        Err(e) => eprintln!(
            "   -> Expected Error: {}. The manager should detect it is already running.",
            e
        ),
    }

    // 3. Let it run for a bit
    println!("\n3. Letting the service run for 5 seconds...");
    thread::sleep(Duration::from_secs(5));

    // 4. Remove the service without stopping it first
    // The `remove` function is designed to stop the service if it's running.
    println!("\n4. Removing the service without explicitly stopping it first...");
    match manager.remove(service_name) {
        Ok(()) => println!("   -> Success: Service was stopped and removed."),
        Err(e) => eprintln!("   -> Error: Failed to remove service: {}", e),
    }

    // 5. Try to stop the service after it has been removed
    println!("\n5. Trying to stop the service that was just removed...");
    match manager.stop(service_name) {
        Ok(()) => println!("   -> Unexpected Success: Stopped a removed service."),
        Err(e) => eprintln!(
            "   -> Expected Error: {}. The manager knows the service is gone.",
            e
        ),
    }

    // 6. Try to remove the service again
    println!("\n6. Trying to remove the service again...");
    match manager.remove(service_name) {
        Ok(()) => println!("   -> Unexpected Success: Removed a non-existent service."),
        Err(e) => eprintln!(
            "   -> Expected Error: {}. The manager correctly reports it's not found.",
            e
        ),
    }

    println!("\n--- Spaghetti Example Finished ---");
}