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/* Varanus: client/server system monitor for PCs.
*
* Copyright (c) 2024 Scott Lawrence.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* TODO
*
* Remove socket file when daemon exits.
*
* Accept command-line arguments to query only part of JSON
*
* Fix delay
*
*/
use std::error;
use std::fs::remove_file;
use std::io::{Read,Write};
use std::os::unix::net::{UnixStream,UnixListener};
use std::str;
use std::sync::{Arc,Mutex};
use std::thread::{sleep,spawn};
use std::time::{Duration,Instant,SystemTime};
use clap::Parser;
use serde::{Serialize,Deserialize};
#[derive(Default)]
#[repr(C)]
struct Sysinfo {
uptime: cty::c_long,
loads: [cty::c_ulong; 3],
totalram: cty::c_ulong,
freeram: cty::c_ulong,
sharedram: cty::c_ulong,
bufferram: cty::c_ulong,
totalswap: cty::c_ulong,
freeswap: cty::c_ulong,
procs: cty::c_ushort,
totalhigh: cty::c_ulong,
freehigh: cty::c_ulong,
mem_unit: cty::c_uint,
/*char _f[20-2*sizeof(long)-sizeof(int)];*/
}
extern "C" {
fn sysinfo(si: *mut Sysinfo) -> cty::c_int;
}
impl Sysinfo {
fn new() -> Self {
let mut si = Sysinfo::default();
unsafe { sysinfo(&mut si) };
return si;
}
}
#[derive(Parser)]
struct Cli {
#[arg(short='d', long)]
daemon: bool,
#[arg(short='v', long)]
verbose: bool,
#[arg(short='D', long, default_value="100")]
delay: u64,
#[arg(short='s', long, default_value="varanus.sock")]
socket: String,
}
#[derive(Debug, Serialize, Deserialize)]
struct Battery {
}
#[derive(Debug, Serialize, Deserialize)]
struct Power {
}
impl Power {
fn new() -> Self {
return Power{}
}
}
#[derive(Debug, Serialize, Deserialize)]
struct Process {
}
#[derive(Debug, Serialize, Deserialize)]
struct ProcFS {
}
impl ProcFS {
}
#[derive(Debug, Serialize, Deserialize)]
struct Memory {
}
impl Memory {
fn new(si: Sysinfo) -> Self {
return Memory{}
}
}
#[derive(Debug, Serialize, Deserialize)]
struct State {
asof: SystemTime,
uptime: i64,
power: Power,
memory: Memory,
}
impl State {
fn new() -> Self {
let asof = SystemTime::now();
let si = Sysinfo::new();
return State {
asof: asof,
uptime: si.uptime,
power: Power::new(),
memory: Memory::new(si)
}
}
fn update(&mut self) {
self.asof = SystemTime::now();
}
}
type Result<T> = std::result::Result<T, Box<dyn error::Error>>;
fn update_state(state: &mut State) {
state.update();
}
fn get_state(sockfile: String) -> Result<State> {
let mut socket = UnixStream::connect(sockfile)?;
let mut buf = vec![];
socket.read_to_end(&mut buf)?;
Ok(serde_json::from_str::<State>(str::from_utf8(&buf)?)?)
}
fn main() {
let args = Cli::parse();
if args.daemon {
let start = Instant::now();
let delay_ms: u64 = args.delay * 1000; // TODO not right
let mut cycle: u64 = 0;
let state_mutex = Arc::new(Mutex::new(State::new()));
let listen_thread = {
let state_mutex = Arc::clone(&state_mutex);
spawn(move || {
let _ = remove_file(&args.socket);
let listener = UnixListener::bind(args.socket).unwrap();
loop {
match listener.accept() {
Ok((mut socket,accept)) => {
let json = {
let state = state_mutex.lock().unwrap();
serde_json::to_string(&*state).unwrap()
};
socket.write_all(json.as_bytes()).unwrap();
},
Err(e) => println!("error: {:?}", e)
}
}
});
};
loop {
if args.verbose {
println!("{:?} elapsed; updating state...", start.elapsed());
}
{
let mut state = state_mutex.lock().unwrap();
update_state(&mut state);
}
cycle += 1;
sleep(Duration::from_millis(cycle*delay_ms) - start.elapsed());
}
} else {
let state = get_state(args.socket).unwrap();
println!("{:#?}", state)
}
}
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