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runner.rs
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runner.rs
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use workers::*;
use colors::*;
use config::*;
use errors::*;
use std::thread::sleep;
use std::time::Duration;
use std::process::{Child, Command, Stdio};
use std::io::Read;
use std::path::Path;
use std::thread;
use std::process;
use std::io::prelude::*;
use std::io;
use redis;
use chrono;
use chrono::prelude::*;
use nix::sys::signal::{kill, Signal};
pub struct Runner<'a> {
config: &'a Config,
}
impl<'a> Runner<'a> {
pub fn new(config: &'a Config) -> Runner<'a> {
Runner { config }
}
pub fn run(&mut self, workers: &mut Vec<Box<Worker>>) -> FromanResult<()> {
let interval = Duration::from_secs(2);
let redis = redis::Client::open(self.config.redis_url.as_str()).unwrap();
let redis_conn = redis.get_connection()?;
let label_size = self.get_label_size(&workers);
println!("Froman monitoring queues...");
loop {
for (worker_index, mut worker) in workers.iter_mut().enumerate() {
let color = COLORS[worker_index % COLORS.len()];
self.work(&mut worker, &redis_conn, color, label_size)?;
}
sleep(interval);
}
}
fn work(
&self,
worker: &mut Box<Worker>,
redis_conn: &redis::Connection,
color: &str,
label_size: usize,
) -> FromanResult<()> {
if worker.work_to_do(&redis_conn)? || worker.work_being_done(&redis_conn)? {
if worker.process().is_some() {
worker.set_terminate_at(None);
} else {
log(worker.app(), label_size, color, "STARTING\n");
let mut process = self.spawn(worker);
self.pipe_output(
process.stdout.take().unwrap(),
worker.app(),
label_size,
color,
);
self.pipe_output(
process.stderr.take().unwrap(),
worker.app(),
label_size,
color,
);
worker.set_process(Some(process));
}
} else {
if worker.process().is_some() {
let now = Local::now();
if worker.terminate_at().is_some() {
if worker.terminate_at().unwrap() <= now {
log(worker.app(), label_size, color, "STOPPING\n");
kill(worker.process_id() as i32, Signal::SIGTERM).unwrap();
worker.set_process(None)
}
} else {
let terminate_at = now + chrono::Duration::seconds(self.config.timeout as i64);
worker.set_terminate_at(Some(terminate_at));
}
}
}
Ok(())
}
fn get_label_size(&self, workers: &Vec<Box<Worker>>) -> usize {
workers.iter().map(|w| w.app().len()).max().unwrap()
}
fn spawn(&self, worker: &Box<Worker>) -> Child {
let (program, args) = worker.command_binary_and_args(&self.config.command_template);
let path = match Path::new(&worker.absolute_path(&self.config.dir)).canonicalize() {
Ok(p) => p,
Err(_) => {
println!("Path `{}` could not be found!", self.config.dir);
process::exit(1);
}
};
let path_str = path.to_str().unwrap();
Command::new(&program)
.args(&args)
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.current_dir(path_str)
.env_remove("PATH") // rvm won't update the current ruby version if a ruby version is already present in the PATH
.env_remove("RUBY_VERSION")
.env_remove("RBENV_VERSION")
.env_remove("RBENV_GEMSET_ALREADY")
.env_remove("RBENV_DIR")
.spawn()
.expect("failure")
}
fn pipe_output<T: 'static + Read + Send>(
&self,
mut out: T,
label: &str,
label_size: usize,
color: &str,
) {
let label = label.to_owned();
let color = color.to_owned();
thread::spawn(move || loop {
let mut buf = [0; 10000];
match out.read(&mut buf) {
Ok(count) => {
if count > 0 {
log(
&label,
label_size,
&color,
&String::from_utf8_lossy(&buf).replace("\u{0}", ""),
);
} else {
break;
}
}
Err(_) => break,
}
});
}
}
fn left_pad(str: &str, length: usize) -> String {
" ".repeat(length - str.len()) + str
}
fn log(label: &str, label_size: usize, color: &str, message: &str) {
if message.trim().is_empty() {
return;
}
for line in message.trim().split("\n") {
println!(
"{}: {}",
colorize(&left_pad(&label, label_size), color),
line
);
io::stdout().flush().ok().expect("Could not flush stdout");
}
}