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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Copyright 2024 LiveKit, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use tokio::sync::{oneshot, Mutex}; | ||
|
|
||
| pub struct Promise<T> { | ||
| tx: Mutex<Option<oneshot::Sender<T>>>, | ||
| rx: Mutex<Option<oneshot::Receiver<T>>>, | ||
| result: Mutex<Option<T>>, | ||
| } | ||
|
|
||
| impl<T: Clone> Promise<T> { | ||
| pub fn new() -> Self { | ||
| let (tx, rx) = oneshot::channel(); | ||
| Self { tx: Mutex::new(Some(tx)), rx: Mutex::new(Some(rx)), result: Default::default() } | ||
| } | ||
|
|
||
| pub fn resolve(&self, result: T) -> Result<(), &'static str> { | ||
| let mut tx = self.tx.try_lock().unwrap(); | ||
| if tx.is_some() { | ||
| let _ = tx.take().unwrap().send(result); | ||
| Ok(()) | ||
| } else { | ||
| Err("promise already used") | ||
| } | ||
| } | ||
|
|
||
| pub async fn result(&self) -> T { | ||
| let mut rx = self.rx.lock().await; | ||
| if rx.is_some() { | ||
| self.result.lock().await.replace(rx.take().unwrap().await.unwrap()); | ||
| } | ||
| self.result.lock().await.clone().unwrap() | ||
| } | ||
|
|
||
| pub fn try_result(&self) -> Option<T> { | ||
| self.result.try_lock().unwrap().clone() | ||
| } | ||
| } |
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