memscope_rs/lockfree/

platform_resources.rs

//! Simplified cross-platform CPU resource monitoring for multi-threaded environments
//!
//! This module provides basic CPU monitoring, with GPU and I/O monitoring marked as experimental

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;

/// Simplified platform-specific resource metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PlatformResourceMetrics {
    pub timestamp: u64,
    pub cpu_metrics: CpuResourceMetrics,
    pub gpu_metrics: Option<GpuResourceMetrics>, // Always None - not implemented
    pub io_metrics: IoResourceMetrics,           // Always default values
    pub thread_metrics: HashMap<u64, ThreadResourceMetrics>,
}

/// CPU utilization metrics with per-core breakdown
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CpuResourceMetrics {
    pub overall_usage_percent: f32,
    pub per_core_usage: Vec<f32>,
    pub frequency_mhz: Vec<u32>,
    pub temperature_celsius: Vec<f32>,
    pub context_switches_per_sec: u64,
    pub interrupts_per_sec: u64,
    pub load_average: (f64, f64, f64), // 1min, 5min, 15min
}

/// GPU utilization and memory metrics (experimental - not implemented)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GpuResourceMetrics {
    pub device_name: String,
    pub vendor: GpuVendor,
    pub compute_usage_percent: f32,
    pub memory_usage_percent: f32,
    pub memory_used_bytes: u64,
    pub memory_total_bytes: u64,
    pub temperature_celsius: f32,
    pub power_usage_watts: f32,
    pub frequency_mhz: u32,
}

/// GPU vendor identification
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum GpuVendor {
    Nvidia,
    Amd,
    Intel,
    Apple,
    Unknown,
}

/// IO subsystem metrics (experimental - returns default values)
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct IoResourceMetrics {
    pub disk_read_bytes_per_sec: u64,
    pub disk_write_bytes_per_sec: u64,
    pub disk_read_ops_per_sec: u64,
    pub disk_write_ops_per_sec: u64,
    pub network_rx_bytes_per_sec: u64,
    pub network_tx_bytes_per_sec: u64,
    pub network_rx_packets_per_sec: u64,
    pub network_tx_packets_per_sec: u64,
}

/// Per-thread resource consumption metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ThreadResourceMetrics {
    pub thread_id: u64,
    pub thread_name: Option<String>,
    pub cpu_usage_percent: f32,
    pub memory_resident_bytes: u64,
    pub memory_virtual_bytes: u64,
    pub io_read_bytes: u64,
    pub io_write_bytes: u64,
    pub cpu_time_user_ns: u64,
    pub cpu_time_kernel_ns: u64,
}

/// Simplified cross-platform resource collector
pub struct PlatformResourceCollector {
    cpu_count: usize,
}

impl PlatformResourceCollector {
    /// Create new simplified resource collector
    pub fn new() -> Result<Self, Box<dyn std::error::Error>> {
        Ok(Self {
            cpu_count: num_cpus::get(),
        })
    }

    /// Collect current CPU metrics only
    pub fn collect_metrics(
        &mut self,
    ) -> Result<PlatformResourceMetrics, Box<dyn std::error::Error>> {
        let timestamp = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)?
            .as_millis() as u64;

        let cpu_metrics = self.collect_basic_cpu_metrics();

        Ok(PlatformResourceMetrics {
            timestamp,
            cpu_metrics,
            gpu_metrics: None, // GPU monitoring not implemented
            io_metrics: IoResourceMetrics::default(), // I/O monitoring not implemented
            thread_metrics: self.collect_basic_thread_metrics(),
        })
    }

    /// Get collection frequency recommendation
    pub fn get_optimal_collection_interval(&self) -> Duration {
        Duration::from_millis(100) // 10Hz default
    }

    fn collect_basic_cpu_metrics(&self) -> CpuResourceMetrics {
        // Basic CPU usage estimation (simplified)
        let usage = self.estimate_cpu_usage();

        CpuResourceMetrics {
            overall_usage_percent: usage,
            per_core_usage: vec![usage / self.cpu_count as f32; self.cpu_count],
            frequency_mhz: vec![0; self.cpu_count], // Not implemented
            temperature_celsius: Vec::new(),        // Not implemented
            context_switches_per_sec: 0,            // Not implemented
            interrupts_per_sec: 0,                  // Not implemented
            load_average: self.get_load_average(),
        }
    }

    fn estimate_cpu_usage(&self) -> f32 {
        // Very basic CPU usage estimation
        #[cfg(unix)]
        {
            if let Ok(uptime) = std::fs::read_to_string("/proc/uptime") {
                let parts: Vec<&str> = uptime.split_whitespace().collect();
                if parts.len() >= 2 {
                    let total = parts[0].parse::<f64>().unwrap_or(1.0);
                    let idle = parts[1].parse::<f64>().unwrap_or(0.0);
                    return ((total - idle) / total * 100.0).clamp(0.0, 100.0) as f32;
                }
            }
        }

        // Fallback: return moderate usage
        25.0
    }

    fn get_load_average(&self) -> (f64, f64, f64) {
        #[cfg(unix)]
        {
            let mut load_avg: [f64; 3] = [0.0; 3];
            unsafe {
                if libc::getloadavg(load_avg.as_mut_ptr(), 3) != -1 {
                    return (load_avg[0], load_avg[1], load_avg[2]);
                }
            }
        }

        (0.0, 0.0, 0.0)
    }

    fn collect_basic_thread_metrics(&self) -> HashMap<u64, ThreadResourceMetrics> {
        let mut metrics = HashMap::new();

        // Add current thread only - use a simple counter as thread ID
        let thread_id = 1u64; // Simplified thread ID
        metrics.insert(
            thread_id,
            ThreadResourceMetrics {
                thread_id,
                thread_name: std::thread::current().name().map(String::from),
                cpu_usage_percent: 0.0,
                memory_resident_bytes: 0, // Not implemented
                memory_virtual_bytes: 0,  // Not implemented
                io_read_bytes: 0,
                io_write_bytes: 0,
                cpu_time_user_ns: 0,
                cpu_time_kernel_ns: 0,
            },
        );

        metrics
    }
}

impl Default for CpuResourceMetrics {
    fn default() -> Self {
        Self {
            overall_usage_percent: 0.0,
            per_core_usage: Vec::new(),
            frequency_mhz: Vec::new(),
            temperature_celsius: Vec::new(),
            context_switches_per_sec: 0,
            interrupts_per_sec: 0,
            load_average: (0.0, 0.0, 0.0),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_simplified_platform_resource_collector_creation() {
        let result = PlatformResourceCollector::new();
        assert!(result.is_ok());
    }

    #[test]
    fn test_simplified_resource_metrics_collection() {
        if let Ok(mut collector) = PlatformResourceCollector::new() {
            let result = collector.collect_metrics();
            assert!(result.is_ok());

            let metrics = result.unwrap();
            assert!(metrics.timestamp > 0);
            assert!(metrics.gpu_metrics.is_none()); // GPU not implemented
                                                    // I/O metrics should be default (all zeros)
        }
    }

    #[test]
    fn test_resource_metrics_serialization() {
        let metrics = PlatformResourceMetrics {
            timestamp: 12345,
            cpu_metrics: CpuResourceMetrics::default(),
            gpu_metrics: None,
            io_metrics: IoResourceMetrics::default(),
            thread_metrics: HashMap::new(),
        };

        let serialized = serde_json::to_string(&metrics).expect("Failed to serialize metrics");
        let _deserialized: PlatformResourceMetrics =
            serde_json::from_str(&serialized).expect("Failed to deserialize metrics");
    }

    #[test]
    fn test_optimal_collection_interval() {
        if let Ok(collector) = PlatformResourceCollector::new() {
            let interval = collector.get_optimal_collection_interval();
            assert!(interval >= Duration::from_millis(50)); // At least 20Hz
            assert!(interval <= Duration::from_secs(1)); // At most 1Hz
        }
    }
}