93 lines
2.6 KiB
Rust
93 lines
2.6 KiB
Rust
use anyhow::Result;
|
|
use chrono::{DateTime, Local};
|
|
use clap::Clap;
|
|
use posixmq::PosixMq;
|
|
use std::{str, time::Duration};
|
|
|
|
/// Receive and print a message from a message queue
|
|
#[derive(Clap, Debug)]
|
|
pub struct Recv {
|
|
/// Do not block
|
|
#[clap(short, long)]
|
|
pub non_blocking: bool,
|
|
/// Print messages as they are received
|
|
#[clap(short, long)]
|
|
pub follow: bool,
|
|
/// Print a timestamp before each message
|
|
#[clap(short, long)]
|
|
pub timestamp: bool,
|
|
/// Timeout in "<timeout>[s]" (default) or "<timeout>ms"
|
|
#[clap(short = 'o', long)]
|
|
pub timeout: Option<String>,
|
|
/// Deadline until messages are received (format: "%Y-%m-%d %H:%M:%S")
|
|
#[clap(short, long)]
|
|
pub deadline: Option<String>,
|
|
#[clap(value_name = "QUEUE")]
|
|
pub queue: String,
|
|
}
|
|
|
|
fn print_message(verbose: bool, priority: u32, length: usize, timestamp: bool, msg: &str) {
|
|
if verbose {
|
|
println!("Priority: {}, length: {}", priority, length);
|
|
}
|
|
|
|
if timestamp {
|
|
println!("{}", Local::now());
|
|
}
|
|
|
|
println!("{}", msg);
|
|
}
|
|
|
|
impl Recv {
|
|
fn receive(&self, verbose: bool, mq: &PosixMq) -> Result<()> {
|
|
let mut buf = vec![0; mq.attributes()?.max_msg_len];
|
|
|
|
if let Some(timeout) = &self.timeout {
|
|
let timeout = if timeout.ends_with("ms") {
|
|
Duration::from_millis(timeout[0..timeout.len() - 2].parse::<u64>()?)
|
|
} else if timeout.ends_with("s") {
|
|
Duration::from_secs(timeout[0..timeout.len() - 1].parse::<u64>()?)
|
|
} else {
|
|
Duration::from_secs(timeout.parse::<u64>()?)
|
|
};
|
|
|
|
let (prio, len) = mq.recv_timeout(&mut buf, timeout)?;
|
|
|
|
print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
|
|
} else if let Some(deadline) = &self.deadline {
|
|
let (prio, len) = mq.recv_deadline(
|
|
&mut buf,
|
|
DateTime::parse_from_str(deadline, "%Y-%m-%d %H:%M:%S")?.into(),
|
|
)?;
|
|
|
|
print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
|
|
} else {
|
|
let (prio, len) = mq.recv(&mut buf)?;
|
|
|
|
print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn run(&self, verbose: bool) -> Result<()> {
|
|
let mq = &mut posixmq::OpenOptions::readonly();
|
|
|
|
if self.non_blocking {
|
|
mq.nonblocking();
|
|
}
|
|
|
|
let mq = mq.open(&self.queue)?;
|
|
|
|
if self.follow {
|
|
loop {
|
|
self.receive(verbose, &mq)?;
|
|
}
|
|
} else {
|
|
self.receive(verbose, &mq)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|