cargo_hammerwork/commands/

worker.rs

use anyhow::Result;
use clap::Subcommand;
use tracing::info;

use crate::config::Config;

#[derive(Subcommand)]
pub enum WorkerCommand {
    #[command(about = "Start a worker for processing jobs")]
    Start {
        #[arg(short = 'u', long, help = "Database connection URL")]
        database_url: Option<String>,
        #[arg(short = 'n', long, help = "Queue name to process")]
        queue: String,
        #[arg(
            short = 'c',
            long,
            default_value = "1",
            help = "Number of worker threads"
        )]
        workers: u32,
        #[arg(long, default_value = "5", help = "Polling interval in seconds")]
        poll_interval: u64,
        #[arg(long, help = "Maximum number of jobs to process before stopping")]
        max_jobs: Option<u32>,
        #[arg(long, help = "Worker timeout in seconds")]
        timeout: Option<u64>,
        #[arg(long, help = "Use strict priority (vs weighted)")]
        strict_priority: bool,
    },
    #[command(about = "List running workers (placeholder)")]
    List {
        #[arg(short = 'u', long, help = "Database connection URL")]
        database_url: Option<String>,
    },
    #[command(about = "Stop workers gracefully (placeholder)")]
    Stop {
        #[arg(short = 'u', long, help = "Database connection URL")]
        database_url: Option<String>,
        #[arg(long, help = "Worker ID to stop")]
        worker_id: Option<String>,
        #[arg(long, help = "Stop all workers")]
        all: bool,
    },
    #[command(about = "Show worker status and metrics (placeholder)")]
    Status {
        #[arg(short = 'u', long, help = "Database connection URL")]
        database_url: Option<String>,
        #[arg(long, help = "Specific worker ID")]
        worker_id: Option<String>,
    },
}

impl WorkerCommand {
    pub async fn execute(&self, config: &Config) -> Result<()> {
        match self {
            WorkerCommand::Start {
                database_url,
                queue,
                workers,
                poll_interval,
                max_jobs,
                timeout,
                strict_priority,
            } => {
                let db_url = database_url
                    .as_ref()
                    .map(|s| s.as_str())
                    .or(config.get_database_url())
                    .ok_or_else(|| anyhow::anyhow!("Database URL is required"))?;

                start_worker(
                    db_url,
                    queue,
                    *workers,
                    *poll_interval,
                    *max_jobs,
                    *timeout,
                    *strict_priority,
                )
                .await?;
            }
            WorkerCommand::List { .. } => {
                list_workers().await?;
            }
            WorkerCommand::Stop { worker_id, all, .. } => {
                stop_workers(worker_id.clone(), *all).await?;
            }
            WorkerCommand::Status { worker_id, .. } => {
                show_worker_status(worker_id.clone()).await?;
            }
        }
        Ok(())
    }
}

async fn start_worker(
    database_url: &str,
    queue: &str,
    worker_count: u32,
    poll_interval: u64,
    max_jobs: Option<u32>,
    timeout: Option<u64>,
    strict_priority: bool,
) -> Result<()> {
    info!("🚀 Starting {} workers for queue: {}", worker_count, queue);
    info!("📡 Database: {}", database_url);
    info!("⏱️  Poll interval: {}s", poll_interval);

    if let Some(max) = max_jobs {
        info!("🎯 Max jobs per worker: {}", max);
    }

    if let Some(t) = timeout {
        info!("⏰ Worker timeout: {}s", t);
    }

    info!(
        "📊 Priority mode: {}",
        if strict_priority {
            "strict"
        } else {
            "weighted"
        }
    );

    println!("⚠️  Worker implementation is a placeholder.");
    println!("📝 In a full implementation, this would:");
    println!("   • Connect to the database");
    println!("   • Create a WorkerPool with the specified configuration");
    println!("   • Start processing jobs from the '{}' queue", queue);
    println!("   • Handle graceful shutdown signals");
    println!("   • Provide real-time metrics and logging");

    // Placeholder for actual worker implementation
    // In a real implementation, you would:
    // 1. Connect to the database
    // 2. Create a hammerwork::WorkerPool
    // 3. Configure job handlers
    // 4. Start the worker pool
    // 5. Handle shutdown signals

    tokio::time::sleep(tokio::time::Duration::from_secs(2)).await;
    println!("✅ Worker simulation completed");

    Ok(())
}

async fn list_workers() -> Result<()> {
    println!("👷 Worker List (Placeholder)");
    println!("═══════════════════════════");

    // In a real implementation, this would:
    // 1. Query a workers registry (Redis, database table, etc.)
    // 2. Show worker IDs, queues, status, start time
    // 3. Display metrics like jobs processed, current load

    let mut table = comfy_table::Table::new();
    table.set_header(vec![
        "Worker ID",
        "Queue",
        "Status",
        "Jobs Processed",
        "Uptime",
        "Last Seen",
    ]);

    // Mock data
    table.add_row(vec![
        "worker-001",
        "emails",
        "🟢 Running",
        "1,234",
        "2h 15m",
        "2s ago",
    ]);
    table.add_row(vec![
        "worker-002",
        "notifications",
        "🟡 Idle",
        "567",
        "1h 42m",
        "5s ago",
    ]);
    table.add_row(vec![
        "worker-003",
        "reports",
        "🔴 Error",
        "89",
        "45m",
        "2m ago",
    ]);

    println!("{}", table);
    println!("\n💡 This is placeholder data. Implement worker registry for real data.");

    Ok(())
}

async fn stop_workers(worker_id: Option<String>, all: bool) -> Result<()> {
    if let Some(id) = worker_id {
        println!("🛑 Stopping worker: {}", id);
        info!("Stopping worker: {}", id);
    } else if all {
        println!("🛑 Stopping all workers");
        info!("Stopping all workers");
    } else {
        return Err(anyhow::anyhow!("Must specify --worker-id or --all"));
    }

    println!("⚠️  Worker stop is a placeholder.");
    println!("📝 In a full implementation, this would:");
    println!("   • Send graceful shutdown signals to worker processes");
    println!("   • Wait for current jobs to complete");
    println!("   • Update worker registry status");
    println!("   • Clean up resources");

    // Placeholder for actual stop implementation
    tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;
    println!("✅ Worker stop simulation completed");

    Ok(())
}

async fn show_worker_status(worker_id: Option<String>) -> Result<()> {
    if let Some(id) = worker_id {
        println!("📊 Worker Status: {}", id);
        println!("═══════════════════════");

        // Mock detailed worker status
        println!("🆔 Worker ID: {}", id);
        println!("📍 Queue: emails");
        println!("🔄 Status: Running");
        println!("⏰ Started: 2024-06-28 10:30:00 UTC");
        println!("⏱️  Uptime: 2h 15m 30s");
        println!("📈 Jobs Processed: 1,234");
        println!("🎯 Success Rate: 98.5%");
        println!("🔄 Current Job: processing-email-456");
        println!("⚡ Last Activity: 2s ago");
        println!("💾 Memory Usage: 45.2 MB");
        println!("🏃 CPU Usage: 12.3%");
    } else {
        println!("📊 Worker Status Overview");
        println!("════════════════════════");

        let mut table = comfy_table::Table::new();
        table.set_header(vec![
            "Worker ID",
            "Queue",
            "Status",
            "Uptime",
            "Jobs",
            "Success Rate",
            "Memory",
        ]);

        // Mock data
        table.add_row(vec![
            "worker-001",
            "emails",
            "🟢 Running",
            "2h 15m",
            "1,234",
            "98.5%",
            "45.2MB",
        ]);
        table.add_row(vec![
            "worker-002",
            "notifications",
            "🟡 Idle",
            "1h 42m",
            "567",
            "99.1%",
            "32.1MB",
        ]);
        table.add_row(vec![
            "worker-003",
            "reports",
            "🔴 Error",
            "45m",
            "89",
            "87.6%",
            "28.9MB",
        ]);

        println!("{}", table);

        println!("\n📈 Aggregate Statistics:");
        println!("   Total Workers: 3");
        println!("   Active Workers: 1");
        println!("   Total Jobs Processed: 1,890");
        println!("   Overall Success Rate: 96.8%");
        println!("   Total Memory Usage: 106.2 MB");
    }

    println!("\n💡 This is placeholder data. Implement worker monitoring for real metrics.");

    Ok(())
}