amberjs 1.17.0

// io_uring 引擎
// 基于 Linux io_uring 的高性能异步 I/O

use std::collections::HashMap;
use std::sync::{Arc, Mutex, RwLock};

use super::{NetworkConfig, NetworkStats};
use std::time::{Duration, Instant};
/// io_uring 配置
#[derive(Debug, Clone)]
pub struct UringConfig {
    pub queue_depth: u32,
    pub cq_size: u32,
    pub enable_sq_poll: bool,
    pub sq_thread_idle: u32,
    pub enable_cqe32: bool,
    pub enable_buffers: bool,
}
impl Default for UringConfig {
    fn default() -> Self {
        Self {
            queue_depth: 256,
            cq_size: 512,
            enable_sq_poll: true,
            sq_thread_idle: 1000,
            enable_cqe32: false,
            enable_buffers: true,
        }
    }
}
/// io_uring 提交条目
#[derive(Debug, Clone)]
pub struct UringSubmission {
    pub opcode: u8,
    pub flags: u8,
    pub ioprio: u16,
    pub fd: i32,
    pub addr: u64,
    pub len: u32,
    pub offset: u64,
    pub user_data: u64,
}
/// io_uring 完成条目
#[derive(Debug, Clone)]
pub struct UringCompletion {
    pub user_data: u64,
    pub result: i32,
    pub flags: u32,
}
/// io_uring 统计
#[derive(Debug, Clone)]
pub struct UringStats {
    pub submissions: u64,
    pub completions: u64,
    pub average_latency_ns: u64,
    pub peak_qps: u64,
    pub queue_utilization: f64,
}
/// io_uring 引擎
pub struct IoUringEngine {
    config: NetworkConfig,
    uring_config: UringConfig,
    stats: Arc<RwLock<UringStats>>,
    active_operations: Arc<RwLock<HashMap<u64, std::time::Instant>>>,
    operation_counter: Arc<RwLock<u64>>,
    completion_queue: Arc<RwLock<Vec<UringCompletion>>>,
}
impl IoUringEngine {
    /// 创建新的 io_uring 引擎
    pub fn new(config: NetworkConfig) -> Self {
        let uring_config: _ = UringConfig::default();
        Self {
            stats: Arc::new(Mutex::new(UringStats {
                submissions: 0,
                completions: 0,
                average_latency_ns: 0,
                peak_qps: 0,
                queue_utilization: 0.0,
            })),
            active_operations: Arc::new(Mutex::new(HashMap::new())),
            operation_counter: Arc::new(Mutex::new(0)),
            completion_queue: Arc::new(Mutex::new(Vec::new())),
            config,
            uring_config,
        }
    }
    /// 初始化 io_uring
    pub async fn initialize(&self) -> Result<(), Box<dyn std::error::Error>> {
        // 实际实现中这里会调用 libc::io_uring_setup
        // 简化实现：模拟初始化
        println!("✅ io_uring 引擎初始化完成");
        // 启动完成队列处理
        let completion_queue: _ = Arc::clone(&self.completion_queue);
        let stats: _ = Arc::clone(&self.stats);
        tokio::spawn(async move {
            loop {
                tokio::time::sleep(Duration::from_millis(1)).await;
                // 处理完成队列
                let mut completions = completion_queue.write().await;
                if !completions.is_empty() {
                    let start_time: _ = std::time::Instant::now();
                    // 处理每个完成条目
                    for completion in completions.drain(..) {
                        Self::process_completion(&stats, &completion).await;
                    }
                    // 更新统计
                    let elapsed: _ = start_time.elapsed();
                    let mut stats_guard = stats.write().await;
                    stats_guard.average_latency_ns = (stats_guard.average_latency_ns
                        + elapsed.as_nanos() as u64) / 2;
                }
            }
        });
        Ok(())
    }
    /// 提交 I/O 操作
    pub async fn submit(&self, submission: UringSubmission) -> Result<(), Box<dyn std::error::Error>> {
        let id: _ = {
            let mut counter = self.operation_counter.write().await;
            *counter += 1;
            *counter
        };
        let submission_with_id: _ = UringSubmission {
            user_data: id,
            ..submission
        };
        // 记录活跃操作
        {
            let mut active = self.active_operations.write().await;
            active.insert(id, std::time::Instant::now());
        }
        // 模拟提交到 io_uring
        self.submit_to_uring(submission_with_id).await?;
        // 更新统计
        let mut stats = self.stats.write().await;
        stats.submissions += 1;
        stats.queue_utilization = (stats.submissions as f64 / self.uring_config.queue_depth as f64)
            .min(1.0);
        Ok(())
    }
    /// 模拟提交到 io_uring
    async fn submit_to_uring(&self, submission: UringSubmission) -> Result<(), Box<dyn std::error::Error>> {
        // 实际实现中这里会将提交条目写入 io_uring 提交队列
        // 简化实现：模拟操作
        match submission.opcode {
            // NOP
            0 => {
                println!("📝 提交 NOP 操作 (id: {})", submission.user_data);
            }
            // READ
            1 => {
                println!("📖 提交 READ 操作 (fd: {}, len: {})", submission.fd, submission.len);
                // 模拟读取操作完成
                self.simulate_completion(submission.user_data, submission.len as i32).await;
            }
            // WRITE
            2 => {
                println!("📝 提交 WRITE 操作 (fd: {}, len: {})", submission.fd, submission.len);
                // 模拟写入操作完成
                self.simulate_completion(submission.user_data, submission.len as i32).await;
            }
            _ => {
                return Err(format!("不支持的操作码: {}", submission.opcode).into());
            }
        }
        Ok(())
    }
    /// 模拟操作完成
    async fn simulate_completion(&self, user_data: u64, result: i32) {
        let completion: _ = UringCompletion {
            user_data,
            result,
            flags: 0,
        };
        let mut queue = self.completion_queue.write().await;
        queue.push(completion);
    }
    /// 处理完成条目
    async fn process_completion(stats: &Arc<RwLock<UringStats>>, completion: &UringCompletion) {
        let mut stats_guard = stats.write().await;
        stats_guard.completions += 1;
        if completion.result < 0 {
            println!("❌ 操作失败 (id: {}, result: {})", completion.user_data, completion.result);
        } else {
            println!("✅ 操作完成 (id: {}, bytes: {})", completion.user_data, completion.result);
        }
    }
    /// 等待完成
    pub async fn wait_for_completions(&self, count: usize) -> Vec<UringCompletion> {
        let mut completions = Vec::with_capacity(count);
        // 等待完成事件
        while completions.len() < count {
            {
                let mut queue = self.completion_queue.write().await;
                if !queue.is_empty() {
                    completions.push(queue.remove(0));
                }
            }
            if completions.len() < count {
                tokio::time::sleep(Duration::from_micros(10)).await;
            }
        }
        completions
    }
    /// 获取统计信息
    pub async fn get_stats(&self) -> UringStats {
        self.stats.read().await.clone()
    }
    /// 获取活跃操作数
    pub async fn get_active_operations_count(&self) -> usize {
        self.active_operations.read().await.len()
    }
    /// 关闭 io_uring
    pub async fn shutdown(&self) -> Result<(), Box<dyn std::error::Error>> {
        // 实际实现中这里会清理 io_uring 资源
        println!("🔄 io_uring 引擎已关闭");
        Ok(())
    }
}
impl Drop for IoUringEngine {
    fn drop(&mut self) {
        // 清理资源
        let temp_file: _ = std::env::temp_dir()
            .join(format!("amberjs_io_uring_{}", std::process::id()));
        let _: _ = std::fs::remove_file(temp_file);
    }
}