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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
mod interface;
pub mod local;
use std::borrow::Cow;
use std::cell::RefCell;
use std::rc::Rc;
pub use crate::interface::*;
use deno_core::error::get_custom_error_class;
use deno_core::op2;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
pub const UNSTABLE_FEATURE_NAME: &str = "cron";
deno_core::extension!(deno_cron,
deps = [ deno_console ],
parameters = [ C: CronHandler ],
ops = [
op_cron_create<C>,
op_cron_next<C>,
],
esm = [ "01_cron.ts" ],
options = {
cron_handler: C,
},
state = |state, options| {
state.put(Rc::new(options.cron_handler));
}
);
struct CronResource<EH: CronHandle + 'static> {
handle: Rc<EH>,
}
impl<EH: CronHandle + 'static> Resource for CronResource<EH> {
fn name(&self) -> Cow<str> {
"cron".into()
}
fn close(self: Rc<Self>) {
self.handle.close();
}
}
#[derive(Debug, thiserror::Error)]
pub enum CronError {
#[error(transparent)]
Resource(deno_core::error::AnyError),
#[error("Cron name cannot exceed 64 characters: current length {0}")]
NameExceeded(usize),
#[error("Invalid cron name: only alphanumeric characters, whitespace, hyphens, and underscores are allowed")]
NameInvalid,
#[error("Cron with this name already exists")]
AlreadyExists,
#[error("Too many crons")]
TooManyCrons,
#[error("Invalid cron schedule")]
InvalidCron,
#[error("Invalid backoff schedule")]
InvalidBackoff,
#[error(transparent)]
AcquireError(#[from] tokio::sync::AcquireError),
#[error(transparent)]
Other(deno_core::error::AnyError),
}
#[op2]
#[smi]
fn op_cron_create<C>(
state: Rc<RefCell<OpState>>,
#[string] name: String,
#[string] cron_schedule: String,
#[serde] backoff_schedule: Option<Vec<u32>>,
) -> Result<ResourceId, CronError>
where
C: CronHandler + 'static,
{
let cron_handler = {
let state = state.borrow();
state
.feature_checker
.check_or_exit(UNSTABLE_FEATURE_NAME, "Deno.cron");
state.borrow::<Rc<C>>().clone()
};
validate_cron_name(&name)?;
let handle = cron_handler.create(CronSpec {
name,
cron_schedule,
backoff_schedule,
})?;
let handle_rid = {
let mut state = state.borrow_mut();
state.resource_table.add(CronResource {
handle: Rc::new(handle),
})
};
Ok(handle_rid)
}
#[op2(async)]
async fn op_cron_next<C>(
state: Rc<RefCell<OpState>>,
#[smi] rid: ResourceId,
prev_success: bool,
) -> Result<bool, CronError>
where
C: CronHandler + 'static,
{
let cron_handler = {
let state = state.borrow();
let resource = match state.resource_table.get::<CronResource<C::EH>>(rid) {
Ok(resource) => resource,
Err(err) => {
if get_custom_error_class(&err) == Some("BadResource") {
return Ok(false);
} else {
return Err(CronError::Resource(err));
}
}
};
resource.handle.clone()
};
cron_handler.next(prev_success).await
}
fn validate_cron_name(name: &str) -> Result<(), CronError> {
if name.len() > 64 {
return Err(CronError::NameExceeded(name.len()));
}
if !name.chars().all(|c| {
c.is_ascii_whitespace() || c.is_ascii_alphanumeric() || c == '_' || c == '-'
}) {
return Err(CronError::NameInvalid);
}
Ok(())
}
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