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Cargo.toml

@@ -0,0 +1,9 @@
+[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"] }

LICENSE

@@ -0,0 +1,19 @@
+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.

README.md

@@ -0,0 +1,9 @@
+# swabd
+
+swatch beat time daemon
+
+## Configuration
+
+`SWABD_PORT` adjusts the listener port number
+
+`SWABD_TZ` adjusts the timezone used for conversion

src/lib.rs

@@ -0,0 +1,56 @@
+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));
+            }
+        });
+    }
+}

src/main.rs

@@ -0,0 +1,13 @@
+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
+}