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#![deny(missing_docs)]
#![deny(warnings)]
use failure::{bail, Error};
use getopts::Options;
use std::env;
use std::fmt;
#[derive(Clone, Debug, PartialEq)]
pub enum RunLevel {
OnBoot,
OnCommand,
}
impl fmt::Display for RunLevel {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
RunLevel::OnBoot => write!(f, "OnBoot"),
RunLevel::OnCommand => write!(f, "OnCommand"),
}
}
}
pub trait AppHandler {
fn on_boot(&self, args: Vec<String>) -> Result<(), Error>;
fn on_command(&self, args: Vec<String>) -> Result<(), Error>;
}
#[macro_export]
macro_rules! app_main {
($handler:expr) => {{
kubos_app::app_start(std::process::id(), $handler)
}};
}
pub fn app_start(_pid: u32, handler: &AppHandler) -> Result<(), Error> {
use log4rs::append::console::ConsoleAppender;
use log4rs::encode::pattern::PatternEncoder;
use log4rs_syslog::SyslogAppender;
let syslog_encoder = Box::new(PatternEncoder::new("{m}"));
let syslog = Box::new(
SyslogAppender::builder()
.encoder(syslog_encoder)
.openlog(
"rust-mission-app",
log4rs_syslog::LogOption::LOG_PID | log4rs_syslog::LogOption::LOG_CONS,
log4rs_syslog::Facility::User,
)
.build(),
);
let stdout = Box::new(ConsoleAppender::builder().build());
let config = log4rs::config::Config::builder()
.appender(log4rs::config::Appender::builder().build("syslog", syslog))
.appender(log4rs::config::Appender::builder().build("stdout", stdout))
.build(
log4rs::config::Root::builder()
.appender("syslog")
.appender("stdout")
.build(log::LevelFilter::Debug),
)?;
log4rs::init_config(config)?;
let args: Vec<String> = env::args().collect();
let program = args[0].clone();
let mut opts = Options::new();
opts.optflagopt(
"r",
"run",
"Run level which should be executed",
"RUN_LEVEL",
);
opts.optflag("h", "help", "Print this help menu");
let matches = match opts.parse(&args[1..]) {
Ok(r) => r,
Err(f) => panic!(f.to_string()),
};
if matches.opt_present("h") {
let brief = format!("Usage: {} [options]", program);
print!("{}", opts.usage(&brief));
return Ok(());
}
let _uuid = env::var_os("KUBOS_APP_UUID");
let run_level = matches
.opt_str("r")
.unwrap_or_else(|| "OnCommand".to_owned());
match run_level.as_ref() {
"OnBoot" => handler.on_boot(args),
"OnCommand" => handler.on_command(args),
level => {
bail!(
"Error: Unknown run level was requested - {}. Available run levels: OnBoot, OnCommand", level
);
}
}
}