68 lines
1.5 KiB
Rust
68 lines
1.5 KiB
Rust
use std::collections::HashMap;
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use std::hash::Hash;
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use std::result;
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use std::time::Duration;
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use tokio::sync::oneshot::{self, Receiver, Sender};
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use tokio::time;
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#[derive(Debug, thiserror::Error)]
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pub enum Error {
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#[error("timed out")]
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TimedOut,
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#[error("canceled")]
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Canceled,
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}
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pub type Result<T> = result::Result<T, Error>;
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#[derive(Debug)]
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pub struct PendingReply<R> {
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timeout: Duration,
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result: Receiver<R>,
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}
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impl<R> PendingReply<R> {
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pub async fn get(self) -> Result<R> {
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let result = time::timeout(self.timeout, self.result).await;
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match result {
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Err(_) => Err(Error::TimedOut),
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Ok(Err(_)) => Err(Error::Canceled),
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Ok(Ok(value)) => Ok(value),
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}
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}
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}
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#[derive(Debug)]
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pub struct Replies<I, R> {
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timeout: Duration,
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pending: HashMap<I, Sender<R>>,
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}
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impl<I: Eq + Hash, R> Replies<I, R> {
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pub fn new(timeout: Duration) -> Self {
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Self {
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timeout,
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pending: HashMap::new(),
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}
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}
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pub fn wait_for(&mut self, id: I) -> PendingReply<R> {
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let (tx, rx) = oneshot::channel();
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self.pending.insert(id, tx);
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PendingReply {
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timeout: self.timeout,
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result: rx,
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}
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}
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pub fn complete(&mut self, id: &I, result: R) {
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if let Some(tx) = self.pending.remove(id) {
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let _ = tx.send(result);
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}
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}
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pub fn purge(&mut self) {
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self.pending.retain(|_, tx| !tx.is_closed());
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}
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}
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