Crate delay_timer

DelayTimer like crontab is a cyclic task manager with latency properties, but synchronous asynchronous tasks are possible, based on an internal event manager and task scheduler, and supported by the runtime provided by smol and tokio, which makes it easy to manage and dynamic add/cancel/remove is supported.

• TaskBuilder It is a builder for Task that provides APIs for setting such as maximum number of parallel runs, run content, run identity, run duration, etc.
• DelayTimerBuilder It is a builder for DelayTimer that provides APIs for setting such as customization runtime and enable status-report.

Usage

First, add this to your Cargo.toml

[dependencies]
delay_timer = "*"

Next:

#[macro_use]
use delay_timer::prelude::*;

use std::str::FromStr;
use std::sync::atomic::{
    AtomicUsize,
    Ordering::{Acquire, Release},
};
use std::sync::{atomic::AtomicI32, Arc};
use std::thread::{self, park_timeout};
use std::time::Duration;
use smol::Timer;
use hyper::{Client, Uri};

fn main() {
    let delay_timer = DelayTimerBuilder::default().build();

    // Add an asynchronous task to delay_timer.
    delay_timer.add_task(build_task(TaskBuilder::default()));
    // Since the tasks are executed in 8-second cycles,
    // we deal with something else.
    // Do someting about 8s.
    thread::sleep(Duration::new(8, 1_000_000));
    delay_timer.remove_task(1);
    delay_timer.stop_delay_timer();
}

fn build_task(mut task_builder: TaskBuilder) -> Task {
    let body = create_async_fn_body!({
        let mut res = surf::get("https://httpbin.org/get").await.unwrap();
        dbg!(res.body_string().await.unwrap());
    });

    task_builder
        .set_frequency_by_candy(CandyFrequency::Repeated(AuspiciousTime::PerEightSeconds))
        .set_task_id(2)
        .set_maximum_running_time(5)
        .spawn(body)
        .unwrap()
}

enum AuspiciousTime {
    PerSevenSeconds,
    PerEightSeconds,
    LoveTime,
}

impl Into<CandyCronStr> for AuspiciousTime {
    fn into(self) -> CandyCronStr {
        match self {
            Self::PerSevenSeconds => CandyCronStr("0/7 * * * * * *".to_string()),
            Self::PerEightSeconds => CandyCronStr("0/8 * * * * * *".to_string()),
            Self::LoveTime => CandyCronStr("0,10,15,25,50 0/1 * * Jan-Dec * 2020-2100".to_string()),
        }
    }
}

Capture the specified environment information and build the closure & task:

#[macro_use]
use delay_timer::prelude::*;

use std::str::FromStr;
use std::sync::atomic::{
    AtomicUsize,
    Ordering::{Acquire, Release},
};
use std::sync::{atomic::AtomicI32, Arc};
use std::thread::{self, park_timeout};
use std::time::Duration;
use smol::Timer;
use hyper::{Client, Uri};


let delay_timer = DelayTimer::new();

let share_num = Arc::new(AtomicUsize::new(0));
let share_num_bunshin = share_num.clone();

let body = create_async_fn_body!((share_num_bunshin){
    share_num_bunshin_ref.fetch_add(1, Release);
    Timer::after(Duration::from_secs(9)).await;
    share_num_bunshin_ref.fetch_sub(1, Release);
});

let task = TaskBuilder::default()
    .set_frequency_by_candy(CandyFrequency::CountDown(9, CandyCron::Secondly))
    .set_task_id(1)
    .set_maximun_parallel_runable_num(3)
    .spawn(body)
    .unwrap();

delay_timer.add_task(task).unwrap();

Building dynamic future tasks:

#[macro_use]
use delay_timer::prelude::*;

use std::str::FromStr;
use std::sync::atomic::{
    AtomicUsize,
    Ordering::{Acquire, Release},
};
use std::sync::{atomic::AtomicI32, Arc};
use std::thread::{self, park_timeout};
use std::time::Duration;
use smol::Timer;
use hyper::{Client, Uri};



fn build_task(mut task_builder: TaskBuilder) -> Task {
    let body = generate_closure_template(String::from("dynamic"));

    task_builder
        .set_frequency_by_candy(CandyFrequency::Repeated(AuspiciousTime::PerEightSeconds))
        .set_task_id(2)
        .set_maximum_running_time(5)
        .spawn(body)
        .unwrap()
}

pub fn generate_closure_template(
    name: String,
) -> impl Fn(TaskContext) -> Box<dyn DelayTaskHandler> + 'static + Send + Sync {
    move |context| {
        let future_inner = async_template(get_timestamp() as i32, name.clone());

        let future = async move {
            future_inner.await;
            context.finishe_task().await;
        };

        create_delay_task_handler(async_spawn(future))
    }
}

pub async fn async_template(id: i32, name: String) {
    let client = Client::new();

    let url = format!("http://httpbin.org/get?id={}&name={}", id, name);
    let uri: Uri = url.parse().unwrap();
    let res = client.get(uri).await.unwrap();
    println!("Response: {}", res.status());
    // Concatenate the body stream into a single buffer...
    let buf = hyper::body::to_bytes(res).await.unwrap();
    println!("body: {:?}", buf);
}

enum AuspiciousTime {
    PerSevenSeconds,
    PerEightSeconds,
    LoveTime,
}

impl Into<CandyCronStr> for AuspiciousTime {
    fn into(self) -> CandyCronStr {
        match self {
            Self::PerSevenSeconds => CandyCronStr("0/7 * * * * * *".to_string()),
            Self::PerEightSeconds => CandyCronStr("0/8 * * * * * *".to_string()),
            Self::LoveTime => CandyCronStr("0,10,15,25,50 0/1 * * Jan-Dec * 2020-2100".to_string()),
        }
    }
}

Re-exports

pub use cron_clock;

Modules

entity	DelayTimer is a cyclic task manager with latency properties, based on an internal event manager and task scheduler, and supported by the runtime provided by smol, which makes it easy to manage asynchronous/synchronous/scripted cyclic tasks.
macros	This macro module provides the declaration macros used for the conditional compilation of lib, and the helper macros provide cycle asynchronous tasks for the user.
prelude	A “prelude” for users of the delay-timer crate.
timer	timer is the core module of the library , it can provide an API for task building , task scheduling , event handling , resource recovery .
utils	utils is a tool module that provides easy shell-command parsing, and functions that generate closures.

Macros

create_async_fn_body	Create a closure that return a DelayTaskHandel by macro.
create_async_fn_tokio_body	tokio-support Create a closure that return a DelayTaskHandel by macro.