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|
use crate::utils::error;
use std::{collections::HashMap, process::Command, time::Instant};
use sysinfo::{ProcessExt, System, SystemExt};
#[derive(Clone)]
pub enum ProcessSorting {
CPU,
MEM,
PID,
NAME,
}
impl Default for ProcessSorting {
fn default() -> Self {
ProcessSorting::CPU
}
}
#[derive(Debug, Clone, Default)]
pub struct ProcessHarvest {
pub pid: u32,
pub cpu_usage_percent: f64,
pub mem_usage_percent: f64,
pub name: String,
}
fn cpu_usage_calculation(
prev_idle: &mut f64, prev_non_idle: &mut f64,
) -> error::Result<(f64, f64)> {
// From SO answer: https://stackoverflow.com/a/23376195
let mut path = std::path::PathBuf::new();
path.push("/proc");
path.push("stat");
let stat_results = std::fs::read_to_string(path)?;
let first_line: &str;
let split_results = stat_results.split('\n').collect::<Vec<&str>>();
if split_results.is_empty() {
return Err(error::BottomError::InvalidIO {
message: format!(
"Unable to properly split the stat results; saw {} values, expected at least 1 value.",
split_results.len()
),
});
} else {
first_line = split_results[0];
}
let val = first_line.split_whitespace().collect::<Vec<&str>>();
// SC in case that the parsing will fail due to length:
if val.len() <= 10 {
return Err(error::BottomError::InvalidIO {
message: format!(
"CPU parsing will fail due to too short of a return value; saw {} values, expected 10 values.",
val.len()
),
});
}
let user: f64 = val[1].parse::<_>().unwrap_or(0_f64);
let nice: f64 = val[2].parse::<_>().unwrap_or(0_f64);
let system: f64 = val[3].parse::<_>().unwrap_or(0_f64);
let idle: f64 = val[4].parse::<_>().unwrap_or(0_f64);
let iowait: f64 = val[5].parse::<_>().unwrap_or(0_f64);
let irq: f64 = val[6].parse::<_>().unwrap_or(0_f64);
let softirq: f64 = val[7].parse::<_>().unwrap_or(0_f64);
let steal: f64 = val[8].parse::<_>().unwrap_or(0_f64);
let guest: f64 = val[9].parse::<_>().unwrap_or(0_f64);
let idle = idle + iowait;
let non_idle = user + nice + system + irq + softirq + steal + guest;
let total = idle + non_idle;
let prev_total = *prev_idle + *prev_non_idle;
let total_delta: f64 = total - prev_total;
let idle_delta: f64 = idle - *prev_idle;
//debug!("Vangelis function: CPU PERCENT: {}", (total_delta - idle_delta) / total_delta * 100_f64);
*prev_idle = idle;
*prev_non_idle = non_idle;
let result = if total_delta - idle_delta != 0_f64 {
total_delta - idle_delta
} else {
1_f64
};
let cpu_percentage = if total_delta != 0_f64 {
result / total_delta
} else {
0_f64
};
Ok((result, cpu_percentage))
}
fn get_process_cpu_stats(pid: u32) -> std::io::Result<f64> {
let mut path = std::path::PathBuf::new();
path.push("/proc");
path.push(&pid.to_string());
path.push("stat");
let stat_results = std::fs::read_to_string(path)?;
let val = stat_results.split_whitespace().collect::<Vec<&str>>();
let utime = val[13].parse::<f64>().unwrap_or(0_f64);
let stime = val[14].parse::<f64>().unwrap_or(0_f64);
//debug!("PID: {}, utime: {}, stime: {}", pid, utime, stime);
Ok(utime + stime) // This seems to match top...
}
/// Note that cpu_percentage should be represented WITHOUT the \times 100 factor!
fn linux_cpu_usage(
pid: u32, cpu_usage: f64, cpu_percentage: f64,
prev_pid_stats: &HashMap<String, (f64, Instant)>,
new_pid_stats: &mut HashMap<String, (f64, Instant)>, use_current_cpu_total: bool,
curr_time: &Instant,
) -> std::io::Result<f64> {
// Based heavily on https://stackoverflow.com/a/23376195 and https://stackoverflow.com/a/1424556
let before_proc_val: f64 = if prev_pid_stats.contains_key(&pid.to_string()) {
prev_pid_stats
.get(&pid.to_string())
.unwrap_or(&(0_f64, *curr_time))
.0
} else {
0_f64
};
let after_proc_val = get_process_cpu_stats(pid)?;
/*debug!(
"PID - {} - Before: {}, After: {}, CPU: {}, Percentage: {}",
pid,
before_proc_val,
after_proc_val,
cpu_usage,
(after_proc_val - before_proc_val) / cpu_usage * 100_f64
);*/
new_pid_stats.insert(pid.to_string(), (after_proc_val, *curr_time));
if use_current_cpu_total {
Ok((after_proc_val - before_proc_val) / cpu_usage * 100_f64)
} else {
Ok((after_proc_val - before_proc_val) / cpu_usage * 100_f64 * cpu_percentage)
}
}
fn convert_ps(
process: &str, cpu_usage: f64, cpu_percentage: f64,
prev_pid_stats: &HashMap<String, (f64, Instant)>,
new_pid_stats: &mut HashMap<String, (f64, Instant)>, use_current_cpu_total: bool,
curr_time: &Instant,
) -> std::io::Result<ProcessHarvest> {
if process.trim().to_string().is_empty() {
return Ok(ProcessHarvest {
pid: 0,
name: "".to_string(),
mem_usage_percent: 0.0,
cpu_usage_percent: 0.0,
});
}
let pid = (&process[..11])
.trim()
.to_string()
.parse::<u32>()
.unwrap_or(0);
let name = (&process[11..61]).trim().to_string();
let mem_usage_percent = (&process[62..])
.trim()
.to_string()
.parse::<f64>()
.unwrap_or(0_f64);
Ok(ProcessHarvest {
pid,
name,
mem_usage_percent,
cpu_usage_percent: linux_cpu_usage(
pid,
cpu_usage,
cpu_percentage,
prev_pid_stats,
new_pid_stats,
use_current_cpu_total,
curr_time,
)?,
})
}
pub fn get_sorted_processes_list(
sys: &System, prev_idle: &mut f64, prev_non_idle: &mut f64,
prev_pid_stats: &mut HashMap<String, (f64, Instant)>, use_current_cpu_total: bool,
mem_total_kb: u64, curr_time: &Instant,
) -> crate::utils::error::Result<Vec<ProcessHarvest>> {
let mut process_vector: Vec<ProcessHarvest> = Vec::new();
if cfg!(target_os = "linux") {
// Linux specific - this is a massive pain... ugh.
let ps_result = Command::new("ps")
.args(&["-axo", "pid:10,comm:50,%mem:5", "--noheader"])
.output()?;
let ps_stdout = String::from_utf8_lossy(&ps_result.stdout);
let split_string = ps_stdout.split('\n');
let cpu_calc = cpu_usage_calculation(prev_idle, prev_non_idle);
if let Ok((cpu_usage, cpu_percentage)) = cpu_calc {
let process_stream = split_string.collect::<Vec<&str>>();
let mut new_pid_stats: HashMap<String, (f64, Instant)> = HashMap::new();
for process in process_stream {
if let Ok(process_object) = convert_ps(
process,
cpu_usage,
cpu_percentage,
&prev_pid_stats,
&mut new_pid_stats,
use_current_cpu_total,
curr_time,
) {
if !process_object.name.is_empty() {
process_vector.push(process_object);
}
}
}
*prev_pid_stats = new_pid_stats;
} else {
error!("Unable to properly parse CPU data in Linux.");
error!("Result: {:?}", cpu_calc.err());
}
} else {
let process_hashmap = sys.get_process_list();
for process_val in process_hashmap
|