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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. diff --git a/README.md b/README.md new file mode 100644 index 0000000..ee7c3d0 --- /dev/null +++ b/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 diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..ab5be54 --- /dev/null +++ b/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(dt: &DateTime) -> f32 { + (dt.hour() * 3600 + dt.minute() * 60 + dt.second()) as f32 / 86.4 +} + +async fn read_req(sock: &mut TcpStream) -> Result> { + 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, tz: Option) -> Result<(), Box> { + 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::().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)); + } + }); + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..17a94c0 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,13 @@ +use std::env; +use std::error::Error; + +#[tokio::main] +async fn main() -> Result<(), Box> { + swabd::serve( + env::var("SWABD_PORT") + .map(|tz| tz.parse::().unwrap()) + .ok(), + env::var("SWABD_TZ").ok(), + ) + .await +}