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extern crate clap;
extern crate posix_mq;
use clap::{App, SubCommand, Arg, AppSettings};
use posix_mq::{Name, Queue};
fn run_ls() {
use std::fs::{read_dir, File};
use std::io::Read;
let mqueues = read_dir("/dev/mqueue")
.expect("Could not read message queues");
mqueues.for_each(|queue| {
//let queue_name = (&queue.unwrap().file_name()).into_string().unwrap();
let path = queue.unwrap().path();
let status = {
let mut file = File::open(&path)
.expect("Could not open queue file");
let mut content = String::new();
file.read_to_string(&mut content).expect("Could not read queue file");
content
};
let queue_name = path.components().last().unwrap().as_os_str();
println!("{:?}: {}", queue_name, status)
});
}
fn run_inspect(queue_name: &str) {
let name = Name::new(queue_name).expect("Invalid queue name");
let queue = Queue::open(name).expect("Could not open queue");
println!("Queue {}:\n", queue_name);
println!("Max. message size: {} bytes", queue.max_size());
println!("Max. # of pending messages: {}", queue.max_pending());
}
fn main() {
let ls = SubCommand::with_name("ls").about("list message queues");
let inspect = SubCommand::with_name("inspect")
.about("inspect details about a queue")
.arg(Arg::with_name("queue")
.short("q")
.required(true)
.takes_value(true));
let matches = App::new("mq")
.setting(AppSettings::SubcommandRequiredElseHelp)
.version("0.0.1")
.about("Administrate and inspect POSIX message queues")
.subcommand(ls)
.subcommand(inspect)
.get_matches();
match matches.subcommand() {
("ls", _) => run_ls(),
("inspect", Some(cmd)) => run_inspect(cmd.value_of("queue").unwrap()),
_ => unimplemented!(),
}
}
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