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inital version, architecture/goal redesign coming soon

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Rowan S-L 2022-04-27 21:56:22 -04:00
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.gitignore vendored Normal file
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/target

377
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Cargo.toml Normal file
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[workspace]
members = [
"dabus",
]
resolver = "2"

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dabus/Cargo.toml Normal file
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[package]
name = "dabus"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
flume = "0.10.12"
log = "0.4.16"
pretty_env_logger = "0.4.0"

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dabus/src/bus/emergency.rs Normal file
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/// pass this as a event and the event loop will exit ;)
pub struct Exit;

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dabus/src/bus/mod.rs Normal file
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pub mod emergency;
use flume::{Receiver, Sender};
use crate::event::BusEvent;
use crate::interface::BusInterface;
use crate::stop::BusStop;
#[derive(Debug)]
pub struct DABus {
global_event_recv: Receiver<BusEvent>,
global_event_send: Sender<BusEvent>,
registered_stops: Vec<Box<dyn BusStop>>,
}
impl DABus {
pub fn new() -> Self {
let (global_event_send, global_event_recv): (_, Receiver<BusEvent>) = flume::unbounded();
Self {
global_event_recv,
global_event_send,
registered_stops: vec![],
}
}
/// Registers a new stop with the bus.
pub fn register<B: BusStop>(&mut self, stop: B) {
self.registered_stops.push(Box::new(stop));
}
pub fn manually_feed(&mut self, event: BusEvent) {
self.global_event_send.send(event).unwrap();
}
pub fn run(&mut self) {
'main: loop {
let mut event = self.global_event_recv.recv().unwrap();
if event.is_into::<emergency::Exit>().is_some() {
break 'main;
}
'consumer: for stop in &mut self.registered_stops {
stop.event(
&mut event,
BusInterface::new(self.global_event_send.clone()),
);
if event.consumed() {
break 'consumer;
}
}
if !event.consumed() {
warn!("Unhandled bus event");
}
}
}
}

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dabus/src/event.rs Normal file
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use std::any::{Any, TypeId};
pub struct BusEvent(Option<Box<dyn Any + 'static>>);
impl BusEvent {
pub fn new(event: impl Any + 'static) -> Self {
Self(Some(Box::new(event)))
}
pub(crate) fn consumed(&self) -> bool {
self.0.is_none()
}
/// checks if the contained value exists, and is of the type `T`
pub fn is<T: Any + 'static>(&self) -> bool {
TypeId::of::<T>() == self.0.type_id() && self.0.is_some()
}
/// if the contained event is of the type `T`, then it returns the event
pub fn is_into<T: Any + 'static>(&mut self) -> Option<Box<T>> {
let raw = self.0.take()?;
match raw.downcast::<T>() {
Ok(event) => Some(event),
Err(mismatched) => {
self.0 = Some(mismatched);
None
}
}
}
}

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dabus/src/interface.rs Normal file
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use crate::event::BusEvent;
use flume::Sender;
#[derive(Debug, Clone)]
pub struct BusInterface {
event_queue: Sender<BusEvent>,
}
impl BusInterface {
pub(crate) fn new(sender: Sender<BusEvent>) -> Self {
Self {
event_queue: sender,
}
}
pub fn fire(&mut self, event: BusEvent) {
// unbounded
debug_assert!(self.event_queue.capacity().is_none());
self.event_queue
.send(event)
.expect("BusStops must be destroyed before the central handler!");
}
}

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dabus/src/main.rs Normal file
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pub mod bus;
pub mod event;
pub mod interface;
pub mod prelude;
pub mod stop;
#[macro_use]
extern crate log;
pub use bus::DABus;
pub use event::BusEvent;
pub use interface::BusInterface;
pub use stop::BusStop;
fn main() {
pretty_env_logger::formatted_builder()
.filter_level(log::LevelFilter::Trace)
.init();
println!("Hello, world!");
}

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dabus/src/prelude.rs Normal file
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//! re-exports of all of `dabus`'s traits. all are re-exported as `_`,
//! so it does not clutter the namespace, but trait methods can still be used
//!
//! ***everone should make preludes like this!!!!!***
pub use crate::stop::BusStop as _;

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dabus/src/stop.rs Normal file
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use std::{any::Any, fmt::Debug};
use crate::{event::BusEvent, BusInterface};
pub trait BusStop: Debug /* deal with it */ + Any /* i swear to god */ {
fn event(
&mut self,
event: &mut BusEvent,
bus: BusInterface,
);
}

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rust-toolchain.toml Normal file
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[toolchain]
channel = "nightly"