calloop/sources/mod.rs
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use std::{
cell::{Ref, RefCell, RefMut},
ops::{BitOr, BitOrAssign},
rc::Rc,
};
use log::trace;
pub use crate::loop_logic::EventIterator;
use crate::{sys::TokenFactory, Poll, Readiness, RegistrationToken, Token};
pub mod channel;
#[cfg(feature = "executor")]
#[cfg_attr(docsrs, doc(cfg(feature = "executor")))]
pub mod futures;
pub mod generic;
pub mod ping;
#[cfg(all(target_os = "linux", feature = "signals"))]
#[cfg_attr(docsrs, doc(cfg(target_os = "linux")))]
pub mod signals;
pub mod timer;
pub mod transient;
/// Possible actions that can be requested to the event loop by an
/// event source once its events have been processed.
///
/// `PostAction` values can be combined with the `|` (bit-or) operator (or with
/// `|=`) with the result that:
/// - if both values are identical, the result is that value
/// - if they are different, the result is [`Reregister`](PostAction::Reregister)
///
/// Bit-or-ing these results is useful for composed sources to combine the
/// results of their child sources, but note that it only applies to the child
/// sources. For example, if every child source returns `Continue`, the result
/// will be `Continue`, but the parent source might still need to return
/// `Reregister` or something else depending on any additional logic it uses.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum PostAction {
/// Continue listening for events on this source as before
Continue,
/// Trigger a re-registration of this source
Reregister,
/// Disable this source
///
/// Has the same effect as [`LoopHandle::disable`](crate::LoopHandle#method.disable)
Disable,
/// Remove this source from the eventloop
///
/// Has the same effect as [`LoopHandle::kill`](crate::LoopHandle#method.kill)
Remove,
}
/// Combines `PostAction` values returned from nested event sources.
impl BitOr for PostAction {
type Output = Self;
fn bitor(self, rhs: Self) -> Self::Output {
if matches!(self, x if x == rhs) {
self
} else {
Self::Reregister
}
}
}
/// Combines `PostAction` values returned from nested event sources.
impl BitOrAssign for PostAction {
fn bitor_assign(&mut self, rhs: Self) {
if *self != rhs {
*self = Self::Reregister;
}
}
}
/// Trait representing an event source
///
/// This is the trait you need to implement if you wish to create your own
/// calloop-compatible event sources.
///
/// The 3 associated types define the type of closure the user will need to
/// provide to process events for your event source.
///
/// The `process_events` method will be called when one of the FD you registered
/// is ready, with the associated readiness and token.
///
/// The `register`, `reregister` and `unregister` methods are plumbing to let your
/// source register itself with the polling system. See their documentation for details.
///
/// In case your event source needs to do some special processing before or after a
/// polling session occurs (to prepare the underlying source for polling, and cleanup
/// after that), you can override [`NEEDS_EXTRA_LIFECYCLE_EVENTS`] to `true`.
/// For all sources for which that constant is `true`, the methods [`before_sleep`] and
/// [`before_handle_events`] will be called.
/// [`before_sleep`] is called before the polling system performs a poll operation.
/// [`before_handle_events`] is called before any process_events methods have been called.
/// This means that during `process_events` you can assume that all cleanup has occured on
/// all sources.
///
/// [`NEEDS_EXTRA_LIFECYCLE_EVENTS`]: EventSource::NEEDS_EXTRA_LIFECYCLE_EVENTS
/// [`before_sleep`]: EventSource::before_sleep
/// [`before_handle_events`]: EventSource::before_handle_events
pub trait EventSource {
/// The type of events generated by your source.
type Event;
/// Some metadata of your event source
///
/// This is typically useful if your source contains some internal state that
/// the user may need to interact with when processing events. The user callback
/// will receive a `&mut Metadata` reference.
///
/// Set to `()` if not needed.
type Metadata;
/// The return type of the user callback
///
/// If the user needs to return some value back to your event source once its
/// processing is finshed (to indicate success or failure for example), you can
/// specify it using this type.
///
/// Set to `()` if not needed.
type Ret;
/// The error type returned from
/// [`process_events()`](Self::process_events()) (not the user callback!).
type Error: Into<Box<dyn std::error::Error + Sync + Send>>;
/// Process any relevant events
///
/// This method will be called every time one of the FD you registered becomes
/// ready, including the readiness details and the associated token.
///
/// Your event source will then do some processing of the file descriptor(s) to generate
/// events, and call the provided `callback` for each one of them.
///
/// You should ensure you drained the file descriptors of their events, especially if using
/// edge-triggered mode.
fn process_events<F>(
&mut self,
readiness: Readiness,
token: Token,
callback: F,
) -> Result<PostAction, Self::Error>
where
F: FnMut(Self::Event, &mut Self::Metadata) -> Self::Ret;
/// Register yourself to this poll instance
///
/// You should register all your relevant file descriptors to the provided [`Poll`](crate::Poll)
/// using its [`Poll::register`](crate::Poll#method.register) method.
///
/// If you need to register more than one file descriptor, you can change the
/// `sub_id` field of the [`Token`](crate::Token) to differentiate between them.
fn register(&mut self, poll: &mut Poll, token_factory: &mut TokenFactory) -> crate::Result<()>;
/// Re-register your file descriptors
///
/// Your should update the registration of all your relevant file descriptor to
/// the provided [`Poll`](crate::Poll) using its [`Poll::reregister`](crate::Poll#method.reregister),
/// if necessary.
fn reregister(
&mut self,
poll: &mut Poll,
token_factory: &mut TokenFactory,
) -> crate::Result<()>;
/// Unregister your file descriptors
///
/// You should unregister all your file descriptors from this [`Poll`](crate::Poll) using its
/// [`Poll::unregister`](crate::Poll#method.unregister) method.
fn unregister(&mut self, poll: &mut Poll) -> crate::Result<()>;
/// Whether this source needs to be sent the [`EventSource::before_sleep`]
/// and [`EventSource::before_handle_events`] notifications. These are opt-in because
/// they require more expensive checks, and almost all sources will not need these notifications
const NEEDS_EXTRA_LIFECYCLE_EVENTS: bool = false;
/// Notification that a single `poll` is about to begin
///
/// Use this to perform operations which must be done before polling,
/// but which may conflict with other event handlers. For example,
/// if polling requires a lock to be taken
///
/// If this returns Ok(Some), this will be treated as an event arriving in polling, and
/// your event handler will be called with the returned `Token` and `Readiness`.
/// Polling will however still occur, but with a timeout of 0, so additional events
/// from this or other sources may also be handled in the same iterations.
/// The returned `Token` must belong to this source
// If you need to return multiple synthetic events from this notification, please
// open an issue
fn before_sleep(&mut self) -> crate::Result<Option<(Readiness, Token)>> {
Ok(None)
}
/// Notification that polling is complete, and [`EventSource::process_events`] will
/// be called with the given events for this source. The iterator may be empty,
/// which indicates that no events were generated for this source
///
/// Please note, the iterator excludes any synthetic events returned from
/// [`EventSource::before_sleep`]
///
/// Use this to perform a cleanup before event handlers with arbitrary
/// code may run. This could be used to drop a lock obtained in
/// [`EventSource::before_sleep`]
#[allow(unused_variables)]
fn before_handle_events(&mut self, events: EventIterator<'_>) {}
}
/// Blanket implementation for boxed event sources. [`EventSource`] is not an
/// object safe trait, so this does not include trait objects.
impl<T: EventSource> EventSource for Box<T> {
type Event = T::Event;
type Metadata = T::Metadata;
type Ret = T::Ret;
type Error = T::Error;
fn process_events<F>(
&mut self,
readiness: Readiness,
token: Token,
callback: F,
) -> Result<PostAction, Self::Error>
where
F: FnMut(Self::Event, &mut Self::Metadata) -> Self::Ret,
{
T::process_events(&mut **self, readiness, token, callback)
}
fn register(&mut self, poll: &mut Poll, token_factory: &mut TokenFactory) -> crate::Result<()> {
T::register(&mut **self, poll, token_factory)
}
fn reregister(
&mut self,
poll: &mut Poll,
token_factory: &mut TokenFactory,
) -> crate::Result<()> {
T::reregister(&mut **self, poll, token_factory)
}
fn unregister(&mut self, poll: &mut Poll) -> crate::Result<()> {
T::unregister(&mut **self, poll)
}
const NEEDS_EXTRA_LIFECYCLE_EVENTS: bool = T::NEEDS_EXTRA_LIFECYCLE_EVENTS;
fn before_sleep(&mut self) -> crate::Result<Option<(Readiness, Token)>> {
T::before_sleep(&mut **self)
}
fn before_handle_events(&mut self, events: EventIterator) {
T::before_handle_events(&mut **self, events)
}
}
/// Blanket implementation for exclusive references to event sources.
/// [`EventSource`] is not an object safe trait, so this does not include trait
/// objects.
impl<T: EventSource> EventSource for &mut T {
type Event = T::Event;
type Metadata = T::Metadata;
type Ret = T::Ret;
type Error = T::Error;
fn process_events<F>(
&mut self,
readiness: Readiness,
token: Token,
callback: F,
) -> Result<PostAction, Self::Error>
where
F: FnMut(Self::Event, &mut Self::Metadata) -> Self::Ret,
{
T::process_events(&mut **self, readiness, token, callback)
}
fn register(&mut self, poll: &mut Poll, token_factory: &mut TokenFactory) -> crate::Result<()> {
T::register(&mut **self, poll, token_factory)
}
fn reregister(
&mut self,
poll: &mut Poll,
token_factory: &mut TokenFactory,
) -> crate::Result<()> {
T::reregister(&mut **self, poll, token_factory)
}
fn unregister(&mut self, poll: &mut Poll) -> crate::Result<()> {
T::unregister(&mut **self, poll)
}
const NEEDS_EXTRA_LIFECYCLE_EVENTS: bool = T::NEEDS_EXTRA_LIFECYCLE_EVENTS;
fn before_sleep(&mut self) -> crate::Result<Option<(Readiness, Token)>> {
T::before_sleep(&mut **self)
}
fn before_handle_events(&mut self, events: EventIterator) {
T::before_handle_events(&mut **self, events)
}
}
pub(crate) struct DispatcherInner<S, F> {
source: S,
callback: F,
needs_additional_lifecycle_events: bool,
}
impl<Data, S, F> EventDispatcher<Data> for RefCell<DispatcherInner<S, F>>
where
S: EventSource,
F: FnMut(S::Event, &mut S::Metadata, &mut Data) -> S::Ret,
{
fn process_events(
&self,
readiness: Readiness,
token: Token,
data: &mut Data,
) -> crate::Result<PostAction> {
let mut disp = self.borrow_mut();
let DispatcherInner {
ref mut source,
ref mut callback,
..
} = *disp;
trace!(
"[calloop] Processing events for source type {}",
std::any::type_name::<S>()
);
source
.process_events(readiness, token, |event, meta| callback(event, meta, data))
.map_err(|e| crate::Error::OtherError(e.into()))
}
fn register(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
token_factory: &mut TokenFactory,
) -> crate::Result<()> {
let mut this = self.borrow_mut();
if this.needs_additional_lifecycle_events {
additional_lifecycle_register.register(token_factory.registration_token());
}
this.source.register(poll, token_factory)
}
fn reregister(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
token_factory: &mut TokenFactory,
) -> crate::Result<bool> {
if let Ok(mut me) = self.try_borrow_mut() {
me.source.reregister(poll, token_factory)?;
if me.needs_additional_lifecycle_events {
additional_lifecycle_register.register(token_factory.registration_token());
}
Ok(true)
} else {
Ok(false)
}
}
fn unregister(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
registration_token: RegistrationToken,
) -> crate::Result<bool> {
if let Ok(mut me) = self.try_borrow_mut() {
me.source.unregister(poll)?;
if me.needs_additional_lifecycle_events {
additional_lifecycle_register.unregister(registration_token);
}
Ok(true)
} else {
Ok(false)
}
}
fn before_sleep(&self) -> crate::Result<Option<(Readiness, Token)>> {
let mut disp = self.borrow_mut();
let DispatcherInner { ref mut source, .. } = *disp;
source.before_sleep()
}
fn before_handle_events(&self, events: EventIterator<'_>) {
let mut disp = self.borrow_mut();
let DispatcherInner { ref mut source, .. } = *disp;
source.before_handle_events(events);
}
}
pub(crate) trait EventDispatcher<Data> {
fn process_events(
&self,
readiness: Readiness,
token: Token,
data: &mut Data,
) -> crate::Result<PostAction>;
fn register(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
token_factory: &mut TokenFactory,
) -> crate::Result<()>;
fn reregister(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
token_factory: &mut TokenFactory,
) -> crate::Result<bool>;
fn unregister(
&self,
poll: &mut Poll,
additional_lifecycle_register: &mut AdditionalLifecycleEventsSet,
registration_token: RegistrationToken,
) -> crate::Result<bool>;
fn before_sleep(&self) -> crate::Result<Option<(Readiness, Token)>>;
fn before_handle_events(&self, events: EventIterator<'_>);
}
#[derive(Default)]
/// The list of events
pub(crate) struct AdditionalLifecycleEventsSet {
/// The list of sources
pub(crate) values: Vec<RegistrationToken>,
}
impl AdditionalLifecycleEventsSet {
fn register(&mut self, token: RegistrationToken) {
self.values.push(token)
}
fn unregister(&mut self, token: RegistrationToken) {
self.values.retain(|it| it != &token)
}
}
// An internal trait to erase the `F` type parameter of `DispatcherInner`
trait ErasedDispatcher<'a, S, Data> {
fn as_source_ref(&self) -> Ref<S>;
fn as_source_mut(&self) -> RefMut<S>;
fn into_source_inner(self: Rc<Self>) -> S;
fn into_event_dispatcher(self: Rc<Self>) -> Rc<dyn EventDispatcher<Data> + 'a>;
}
impl<'a, S, Data, F> ErasedDispatcher<'a, S, Data> for RefCell<DispatcherInner<S, F>>
where
S: EventSource + 'a,
F: FnMut(S::Event, &mut S::Metadata, &mut Data) -> S::Ret + 'a,
{
fn as_source_ref(&self) -> Ref<S> {
Ref::map(self.borrow(), |inner| &inner.source)
}
fn as_source_mut(&self) -> RefMut<S> {
RefMut::map(self.borrow_mut(), |inner| &mut inner.source)
}
fn into_source_inner(self: Rc<Self>) -> S {
if let Ok(ref_cell) = Rc::try_unwrap(self) {
ref_cell.into_inner().source
} else {
panic!("Dispatcher is still registered");
}
}
fn into_event_dispatcher(self: Rc<Self>) -> Rc<dyn EventDispatcher<Data> + 'a>
where
S: 'a,
{
self as Rc<dyn EventDispatcher<Data> + 'a>
}
}
/// An event source with its callback.
///
/// The `Dispatcher` can be registered in an event loop.
/// Use the `as_source_{ref,mut}` functions to interact with the event source.
/// Use `into_source_inner` to get the event source back.
pub struct Dispatcher<'a, S, Data>(Rc<dyn ErasedDispatcher<'a, S, Data> + 'a>);
impl<'a, S, Data> std::fmt::Debug for Dispatcher<'a, S, Data> {
#[cfg_attr(feature = "nightly_coverage", coverage(off))]
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str("Dispatcher { ... }")
}
}
impl<'a, S, Data> Dispatcher<'a, S, Data>
where
S: EventSource + 'a,
{
/// Builds a dispatcher.
///
/// The resulting `Dispatcher`
pub fn new<F>(source: S, callback: F) -> Self
where
F: FnMut(S::Event, &mut S::Metadata, &mut Data) -> S::Ret + 'a,
{
Dispatcher(Rc::new(RefCell::new(DispatcherInner {
source,
callback,
needs_additional_lifecycle_events: S::NEEDS_EXTRA_LIFECYCLE_EVENTS,
})))
}
/// Returns an immutable reference to the event source.
///
/// # Panics
///
/// Has the same semantics as `RefCell::borrow()`.
///
/// The dispatcher being mutably borrowed while its events are dispatched,
/// this method will panic if invoked from within the associated dispatching closure.
pub fn as_source_ref(&self) -> Ref<S> {
self.0.as_source_ref()
}
/// Returns a mutable reference to the event source.
///
/// # Panics
///
/// Has the same semantics as `RefCell::borrow_mut()`.
///
/// The dispatcher being mutably borrowed while its events are dispatched,
/// this method will panic if invoked from within the associated dispatching closure.
pub fn as_source_mut(&self) -> RefMut<S> {
self.0.as_source_mut()
}
/// Consumes the Dispatcher and returns the inner event source.
///
/// # Panics
///
/// Panics if the `Dispatcher` is still registered.
pub fn into_source_inner(self) -> S {
self.0.into_source_inner()
}
pub(crate) fn clone_as_event_dispatcher(&self) -> Rc<dyn EventDispatcher<Data> + 'a> {
Rc::clone(&self.0).into_event_dispatcher()
}
}
impl<'a, S, Data> Clone for Dispatcher<'a, S, Data> {
fn clone(&self) -> Dispatcher<'a, S, Data> {
Dispatcher(Rc::clone(&self.0))
}
}
/// An idle callback that was inserted in this loop
///
/// This handle allows you to cancel the callback. Dropping
/// it will *not* cancel it.
pub struct Idle<'i> {
pub(crate) callback: Rc<RefCell<dyn CancellableIdle + 'i>>,
}
impl<'i> std::fmt::Debug for Idle<'i> {
#[cfg_attr(feature = "nightly_coverage", coverage(off))]
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str("Idle { ... }")
}
}
impl<'i> Idle<'i> {
/// Cancel the idle callback if it was not already run
pub fn cancel(self) {
self.callback.borrow_mut().cancel();
}
}
pub(crate) trait CancellableIdle {
fn cancel(&mut self);
}
impl<F> CancellableIdle for Option<F> {
fn cancel(&mut self) {
self.take();
}
}
pub(crate) trait IdleDispatcher<Data> {
fn dispatch(&mut self, data: &mut Data);
}
impl<Data, F> IdleDispatcher<Data> for Option<F>
where
F: FnMut(&mut Data),
{
fn dispatch(&mut self, data: &mut Data) {
if let Some(callabck) = self.as_mut() {
callabck(data);
}
}
}
#[cfg(test)]
mod tests {
use std::time::Duration;
use crate::{ping::make_ping, EventLoop};
// Test event source boxing.
#[test]
fn test_boxed_source() {
let mut fired = false;
let (pinger, source) = make_ping().unwrap();
let boxed = Box::new(source);
let mut event_loop = EventLoop::try_new().unwrap();
let handle = event_loop.handle();
let token = handle
.insert_source(boxed, |_, _, fired| *fired = true)
.unwrap();
pinger.ping();
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(fired);
fired = false;
handle.update(&token).unwrap();
pinger.ping();
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(fired);
fired = false;
handle.remove(token);
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(!fired);
}
// Test event source trait methods via mut ref.
#[test]
fn test_mut_ref_source() {
let mut fired = false;
let (pinger, mut source) = make_ping().unwrap();
let source_ref = &mut source;
let mut event_loop = EventLoop::try_new().unwrap();
let handle = event_loop.handle();
let token = handle
.insert_source(source_ref, |_, _, fired| *fired = true)
.unwrap();
pinger.ping();
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(fired);
fired = false;
handle.update(&token).unwrap();
pinger.ping();
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(fired);
fired = false;
handle.remove(token);
event_loop
.dispatch(Duration::new(0, 0), &mut fired)
.unwrap();
assert!(!fired);
}
// Test PostAction combinations.
#[test]
fn post_action_combine() {
use super::PostAction::*;
assert_eq!(Continue | Continue, Continue);
assert_eq!(Continue | Reregister, Reregister);
assert_eq!(Continue | Disable, Reregister);
assert_eq!(Continue | Remove, Reregister);
assert_eq!(Reregister | Continue, Reregister);
assert_eq!(Reregister | Reregister, Reregister);
assert_eq!(Reregister | Disable, Reregister);
assert_eq!(Reregister | Remove, Reregister);
assert_eq!(Disable | Continue, Reregister);
assert_eq!(Disable | Reregister, Reregister);
assert_eq!(Disable | Disable, Disable);
assert_eq!(Disable | Remove, Reregister);
assert_eq!(Remove | Continue, Reregister);
assert_eq!(Remove | Reregister, Reregister);
assert_eq!(Remove | Disable, Reregister);
assert_eq!(Remove | Remove, Remove);
}
// Test PostAction self-assignment.
#[test]
fn post_action_combine_assign() {
use super::PostAction::*;
let mut action = Continue;
action |= Continue;
assert_eq!(action, Continue);
let mut action = Continue;
action |= Reregister;
assert_eq!(action, Reregister);
let mut action = Continue;
action |= Disable;
assert_eq!(action, Reregister);
let mut action = Continue;
action |= Remove;
assert_eq!(action, Reregister);
let mut action = Reregister;
action |= Continue;
assert_eq!(action, Reregister);
let mut action = Reregister;
action |= Reregister;
assert_eq!(action, Reregister);
let mut action = Reregister;
action |= Disable;
assert_eq!(action, Reregister);
let mut action = Reregister;
action |= Remove;
assert_eq!(action, Reregister);
let mut action = Disable;
action |= Continue;
assert_eq!(action, Reregister);
let mut action = Disable;
action |= Reregister;
assert_eq!(action, Reregister);
let mut action = Disable;
action |= Disable;
assert_eq!(action, Disable);
let mut action = Disable;
action |= Remove;
assert_eq!(action, Reregister);
let mut action = Remove;
action |= Continue;
assert_eq!(action, Reregister);
let mut action = Remove;
action |= Reregister;
assert_eq!(action, Reregister);
let mut action = Remove;
action |= Disable;
assert_eq!(action, Reregister);
let mut action = Remove;
action |= Remove;
assert_eq!(action, Remove);
}
}