finga
3572b12a1a
This subcommand receives one or more messages from a queue. Three different methods are supported, read message by message, read until a given timout or read until a specified date and time. This subcommand also supports the `--non-blocking` flag.
93 lines
2.6 KiB
Rust
93 lines
2.6 KiB
Rust
use anyhow::Result;
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use chrono::{DateTime, Local};
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use clap::Clap;
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use posixmq::PosixMq;
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use std::{str, time::Duration};
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/// Receive and print a message from a message queue
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#[derive(Clap, Debug)]
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pub struct Recv {
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/// Do not block
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#[clap(short, long)]
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pub non_blocking: bool,
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/// Print messages as they are received
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#[clap(short, long)]
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pub follow: bool,
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/// Print a timestamp before each message
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#[clap(short, long)]
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pub timestamp: bool,
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/// Timeout in "<timeout>[s]" (default) or "<timeout>ms"
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#[clap(short = 'o', long)]
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pub timeout: Option<String>,
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/// Deadline until messages are received (format: "%Y-%m-%d %H:%M:%S")
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#[clap(short, long)]
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pub deadline: Option<String>,
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#[clap(value_name = "QNAME")]
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pub queue: String,
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}
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fn print_message(verbose: bool, priority: u32, length: usize, timestamp: bool, msg: &str) {
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if verbose {
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println!("Priority: {}, length: {}", priority, length);
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}
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if timestamp {
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println!("{}", Local::now());
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}
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println!("{}", msg);
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}
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impl Recv {
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fn receive(&self, verbose: bool, mq: &PosixMq) -> Result<()> {
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let mut buf = vec![0; mq.attributes()?.max_msg_len];
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if let Some(timeout) = &self.timeout {
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let timeout = if timeout.ends_with("ms") {
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Duration::from_millis(timeout[0..timeout.len() - 2].parse::<u64>()?)
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} else if timeout.ends_with("s") {
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Duration::from_secs(timeout[0..timeout.len() - 1].parse::<u64>()?)
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} else {
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Duration::from_secs(timeout.parse::<u64>()?)
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};
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let (prio, len) = mq.recv_timeout(&mut buf, timeout)?;
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print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
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} else if let Some(deadline) = &self.deadline {
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let (prio, len) = mq.recv_deadline(
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&mut buf,
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DateTime::parse_from_str(deadline, "%Y-%m-%d %H:%M:%S")?.into(),
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)?;
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print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
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} else {
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let (prio, len) = mq.recv(&mut buf)?;
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print_message(verbose, prio, len, self.timestamp, str::from_utf8(&buf)?);
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}
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Ok(())
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}
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pub fn run(&self, verbose: bool) -> Result<()> {
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let mq = &mut posixmq::OpenOptions::readonly();
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if self.non_blocking {
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mq.nonblocking();
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}
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let mq = mq.open(&self.queue)?;
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if self.follow {
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loop {
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self.receive(verbose, &mq)?;
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}
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} else {
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self.receive(verbose, &mq)?;
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}
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Ok(())
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}
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}
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