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use std::{
collections::HashMap,
sync::{Arc, RwLock},
};
use crate::{
error::PulsyncError,
recurrence::Recurrence,
scheduler::{Scheduler, TaskScheduler},
task::{
async_task::{AsyncTask, AsyncTaskHandler},
TaskDetails, TaskId, TaskStatus,
},
};
impl TaskScheduler for Scheduler {
/// Create a new Asynchronous Scheduler.
fn build() -> Self {
Scheduler(Arc::new(RwLock::new(HashMap::<TaskId, AsyncTask>::new())))
}
/// Add a task to the scheduler.
///
/// The task will be executed every `recurrence` time (according to the `unit` and `count`).
///
/// Do nothing if the task already exists in the scheduler.
///
/// # Example
/// ```rust,ignore
/// let id = scheduler.schedule(task, every(1.seconds())).unwrap();
/// ```
fn schedule(
&mut self,
task: Box<dyn AsyncTaskHandler + Send + Sync + 'static>,
recurrence: Recurrence,
) -> Result<TaskId, PulsyncError> {
let id = task.unique_id(recurrence);
if self.read().unwrap().contains_key(&id) {
tracing::info!("[schedule] Task ({id}): already scheduled");
return Err(PulsyncError::AlreadyScheduled(id));
}
let status = Arc::new(RwLock::new(TaskStatus::Running));
let recurrence = Arc::new(RwLock::new(recurrence));
let title = Arc::new(task.title());
let created_at = chrono::Utc::now().naive_utc();
let handle = {
let status = status.clone();
let recurrence = recurrence.clone();
let tasks = self.clone();
tokio::spawn(async move {
{
if recurrence.clone().read().unwrap().run_after {
let duration = {
let read_guard = recurrence.read().unwrap();
read_guard.unit
};
let _ = tokio::time::sleep(duration.into()).await;
}
}
loop {
if *status.read().unwrap() == TaskStatus::Abort {
break;
}
{
let mut recurrence = recurrence.write().unwrap();
if let Some(limit) = recurrence.limit {
let now = chrono::Utc::now().naive_utc();
let elapsed_time = now - created_at;
if elapsed_time.num_seconds() as u64 >= *limit {
break;
}
}
if let Some(limit_datetime) = recurrence.limit_datetime {
if limit_datetime <= chrono::Utc::now().naive_utc() {
break;
}
}
match recurrence.count {
None => {}
Some(0) => break,
Some(count) => {
recurrence.count = Some(count - 1);
}
}
}
if *status.read().unwrap() == TaskStatus::Running {
task.run().await;
}
{
let duration = {
let read_guard = recurrence.read().unwrap();
read_guard.unit
};
let _ = tokio::time::sleep(duration.into()).await;
}
}
tasks.write().unwrap().remove(&id);
})
};
let task = AsyncTask {
id,
created_at,
title,
status,
handle,
recurrence,
};
self.write().unwrap().insert(task.id, task);
Ok(id)
}
/// Update the recurrence of a task.
///
/// Do nothing if the task does not exist in the scheduler.
///
/// # Example
/// ```rust,ignore
/// let id = scheduler.schedule(task, every(1.seconds())).unwrap();
/// let new_id = scheduler.reschedule(id, every(3.seconds())).unwrap();
/// ```
fn reschedule(&mut self, id: TaskId, recurrence: Recurrence) -> Result<TaskId, PulsyncError> {
let mut binding = self.write().unwrap();
let Some(task) = binding.get_mut(&id) else {
tracing::info!("[reschedule] Task ({id}): not found");
return Err(PulsyncError::TaskNotFound("reschedule", id));
};
*task.recurrence.write().unwrap() = recurrence;
Ok(id)
}
/// Pause the execution of a task.
///
/// Do nothing if the task doesn't exist in the scheduler or if the task is already paused.
///
/// # Example
/// ```rust,ignore
/// let id = scheduler.schedule(task, every(1.seconds())).unwrap();
/// scheduler.pause(id);
/// ```
fn pause(&mut self, id: TaskId) -> Result<(), PulsyncError> {
let mut binding = self.write().unwrap();
let Some(task) = binding.get_mut(&id) else {
tracing::info!("[pause] Task ({id}): not found");
return Err(PulsyncError::TaskNotFound("pause", id));
};
if *task.status.read().unwrap() == TaskStatus::Paused {
tracing::info!("[pause] Task ({id}): already paused");
return Err(PulsyncError::AlreadyPaused(id));
}
*task.status.write().unwrap() = TaskStatus::Paused;
Ok(())
}
/// Resume the execution of a task.
///
/// Do nothing if the task doesn't exist in the scheduler or if the task is already resumed.
///
/// # Example
/// ```rust,ignore
/// let id = scheduler.schedule(task, every(1.seconds())).unwrap();
/// scheduler.resume(id);
/// ```
fn resume(&mut self, id: TaskId) -> Result<(), PulsyncError> {
let mut binding = self.write().unwrap();
let Some(task) = binding.get_mut(&id) else {
tracing::info!("[resume] Task ({id}): not found");
return Err(PulsyncError::TaskNotFound("resume", id));
};
if *task.status.read().unwrap() == TaskStatus::Running {
tracing::info!("[resume] Task ({id}): already resumed");
return Err(PulsyncError::AlreadyResumed(id));
}
*task.status.write().unwrap() = TaskStatus::Running;
Ok(())
}
/// Abort the execution of a task. (The task will be removed from the scheduler)
///
/// Do nothing if the task doesn't exist in the scheduler.
///
/// # Example
/// ```rust,ignore
/// let id = scheduler.schedule(task, every(1.seconds())).unwrap();
/// scheduler.abort(id);
/// ```
fn abort(&mut self, id: TaskId) -> Result<(), PulsyncError> {
let mut binding = self.write().unwrap();
let Some(task) = binding.remove(&id) else {
tracing::info!("[abort] Task ({id}): not found");
return Err(PulsyncError::TaskNotFound("abort", id));
};
*task.status.write().unwrap() = TaskStatus::Abort;
task.handle.abort();
Ok(())
}
/// Run a task once.
///
/// # Example
/// ```rust,ignore
/// scheduler.run(task);
/// ```
fn run(&self, task: impl AsyncTaskHandler) {
tokio::spawn(async move { task.run().await });
}
/// Collect the title of all tasks in the scheduler.
///
/// # Example
/// ```rust,ignore
/// let titles = scheduler.get();
/// ```
fn get(&self) -> Vec<TaskDetails> {
self.read()
.unwrap()
.values()
.map(|task| TaskDetails {
id: task.id,
label: task.to_string(),
recurrence: task.recurrence.clone(),
status: *task.status.read().unwrap(),
created_at: task.created_at,
})
.collect()
}
#[cfg(feature = "serde")]
fn restart(
tasks: Vec<(
Box<dyn AsyncTaskHandler + Send + Sync + 'static>,
Recurrence,
)>,
) -> (Self, Vec<Result<TaskId, PulsyncError>>) {
let mut scheduler = Self::build();
let task_ids = tasks
.into_iter()
.map(|(task, recurrence)| scheduler.schedule(task, recurrence))
.collect::<Vec<Result<TaskId, PulsyncError>>>();
(scheduler, task_ids)
}
}