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Cargo.toml Normal file
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[package]
name = "swabd"
version = "0.1.0"
edition = "2021"
[dependencies]
chrono = "0.4.37"
chrono-tz = "0.8.6"
tokio = { version = "1.36.0", features = ["full"] }

19
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Copyright (c) 2024 mos
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

9
README.md Normal file
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# swabd
swatch beat time daemon
## Configuration
`SWABD_PORT` adjusts the listener port number
`SWABD_TZ` adjusts the timezone used for conversion

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use chrono::prelude::*;
use chrono_tz::{Tz, CET};
use std::error::Error;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio::net::{TcpListener, TcpStream};
const REQ_METHOD: &[u8] = "GET".as_bytes();
const RES_HEADER: &str = "HTTP/1.1 200 OK\nServer: swabd\n";
const PORT: i32 = 9090;
fn to_beat<Tz: TimeZone>(dt: &DateTime<Tz>) -> f32 {
(dt.hour() * 3600 + dt.minute() * 60 + dt.second()) as f32 / 86.4
}
async fn read_req(sock: &mut TcpStream) -> Result<bool, Box<dyn Error + Send + Sync>> {
let mut buf = vec![0; 8];
loop {
if let Ok(n) = sock.read(&mut buf).await {
if n >= REQ_METHOD.len() {
break;
}
} else {
return Err("socket data read error".into());
}
}
Ok(&buf[..REQ_METHOD.len()] == REQ_METHOD)
}
pub async fn serve(port: Option<i32>, tz: Option<String>) -> Result<(), Box<dyn Error>> {
let addr = format!("127.0.0.1:{}", port.unwrap_or(PORT));
let listen = TcpListener::bind(&addr).await?;
let tz = tz.and_then(|s| s.parse::<Tz>().ok()).unwrap_or(CET);
loop {
let (mut sock, addr) = listen.accept().await?;
println!("{}: connected", addr);
tokio::spawn(async move {
if let Err(e) = read_req(&mut sock).await {
eprintln!("{}: {}", addr, e);
} else {
let dt = Utc::now().with_timezone(&tz);
let mut res = format!("@{:.2}\n", to_beat(&dt));
res = format!("{}Content-Length: {}\n\n{}", RES_HEADER, res.len(), res);
sock.write_all(res.as_bytes())
.await
.unwrap_or(eprintln!("{}: connection closed", addr));
}
});
}
}

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use std::env;
use std::error::Error;
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
swabd::serve(
env::var("SWABD_PORT")
.map(|tz| tz.parse::<i32>().unwrap())
.ok(),
env::var("SWABD_TZ").ok(),
)
.await
}