codemp/src/operation/controller.rs

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use std::{sync::Mutex, collections::VecDeque, ops::Range};
use operational_transform::{OperationSeq, OTError};
use tokio::sync::watch;
use tracing::{warn, error};
use super::{OperationFactory, OperationProcessor, op_effective_range};
pub struct OperationController {
text: Mutex<String>,
queue: Mutex<VecDeque<OperationSeq>>,
last: Mutex<watch::Receiver<OperationSeq>>,
notifier: watch::Sender<OperationSeq>,
changed: Mutex<watch::Receiver<Range<u64>>>,
changed_notifier: watch::Sender<Range<u64>>,
run: watch::Receiver<bool>,
stop: watch::Sender<bool>,
}
impl OperationController {
pub fn new(content: String) -> Self {
let (tx, rx) = watch::channel(OperationSeq::default());
let (done, wait) = watch::channel(0..0);
let (stop, run) = watch::channel(true);
OperationController {
text: Mutex::new(content),
queue: Mutex::new(VecDeque::new()),
last: Mutex::new(rx),
notifier: tx,
changed: Mutex::new(wait),
changed_notifier: done,
run, stop,
}
}
pub async fn wait(&self) -> Range<u64> {
let mut blocker = self.changed.lock().unwrap().clone();
// TODO less jank way
ignore_and_log(blocker.changed().await, "waiting for changed content #1");
ignore_and_log(blocker.changed().await, "waiting for changed content #2");
let span = blocker.borrow().clone();
span
}
pub async fn poll(&self) -> Option<OperationSeq> {
let len = self.queue.lock().unwrap().len();
if len <= 0 {
let mut recv = self.last.lock().unwrap().clone();
// TODO less jank way
ignore_and_log(recv.changed().await, "wairing for op changes #1"); // acknowledge current state
ignore_and_log(recv.changed().await, "wairing for op changes #2"); // wait for a change in state
}
Some(self.queue.lock().unwrap().get(0)?.clone())
}
pub async fn ack(&self) -> Option<OperationSeq> {
self.queue.lock().unwrap().pop_front()
}
pub fn stop(&self) -> bool {
match self.stop.send(false) {
Ok(()) => {
ignore_and_log(self.changed_notifier.send(0..0), "unlocking downstream for stop");
ignore_and_log(self.notifier.send(OperationSeq::default()), "unlocking upstream for stop");
true
},
Err(e) => {
error!("could not send stop signal to workers: {}", e);
false
}
}
}
pub fn run(&self) -> bool {
*self.run.borrow()
}
}
impl OperationFactory for OperationController {
fn content(&self) -> String {
self.text.lock().unwrap().clone()
}
}
/// TODO properly handle errors rather than sinking them all in here!
fn ignore_and_log<T, E : std::fmt::Display>(x: Result<T, E>, msg: &str) {
match x {
Ok(_) => {},
Err(e) => {
warn!("ignored error {}: {}", msg, e);
}
}
}
#[tonic::async_trait]
impl OperationProcessor for OperationController {
async fn apply(&self, op: OperationSeq) -> Result<Range<u64>, OTError> {
let txt = self.content();
let res = op.apply(&txt)?;
*self.text.lock().unwrap() = res.clone();
self.queue.lock().unwrap().push_back(op.clone());
ignore_and_log(self.notifier.send(op.clone()), "notifying of applied change");
Ok(op_effective_range(&op))
}
async fn process(&self, mut op: OperationSeq) -> Result<Range<u64>, OTError> {
let mut queue = self.queue.lock().unwrap();
for el in queue.iter_mut() {
(op, *el) = op.transform(el)?;
}
let txt = self.content();
let res = op.apply(&txt)?;
let span = op_effective_range(&op);
*self.text.lock().unwrap() = res.clone();
ignore_and_log(self.changed_notifier.send(span.clone()), "notifying of changed content");
Ok(span)
}
}