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use std::fmt;
use std::pin::Pin;
use std::time::Duration;
use async_std::io::{self, Read, Write};
use async_std::prelude::*;
use async_std::stream::Stream;
use futures::task::{Context, Poll};
use imap_proto::{RequestId, Response, Status};
use crate::client::Session;
use crate::error::Result;
use crate::parse::handle_unilateral;
use crate::types::ResponseData;
#[derive(Debug)]
pub struct Handle<T: Read + Write + Unpin + fmt::Debug> {
session: Session<T>,
id: Option<RequestId>,
}
impl<T: Read + Write + Unpin + fmt::Debug> Unpin for Handle<T> {}
impl<T: Read + Write + Unpin + fmt::Debug + Send> Stream for Handle<T> {
type Item = io::Result<ResponseData>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.as_mut().session().get_stream().poll_next(cx)
}
}
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct IdleStream<'a, St> {
stream: &'a mut St,
}
impl<St: Unpin> Unpin for IdleStream<'_, St> {}
impl<'a, St: Stream + Unpin> IdleStream<'a, St> {
unsafe_pinned!(stream: &'a mut St);
pub(crate) fn new(stream: &'a mut St) -> Self {
IdleStream { stream }
}
}
impl<St: futures::stream::FusedStream + Unpin> futures::stream::FusedStream for IdleStream<'_, St> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St: Stream + Unpin> Stream for IdleStream<'_, St> {
type Item = St::Item;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.stream().poll_next(cx)
}
}
#[derive(Debug, PartialEq, Eq)]
pub enum IdleResponse {
ManualInterrupt,
Timeout,
NewData(ResponseData),
}
impl<T: Read + Write + Unpin + fmt::Debug + Send> Handle<T> {
unsafe_pinned!(session: Session<T>);
pub(crate) fn new(session: Session<T>) -> Handle<T> {
Handle { session, id: None }
}
pub fn wait(
&mut self,
) -> (
impl Future<Output = Result<IdleResponse>> + '_,
stop_token::StopSource,
) {
assert!(
self.id.is_some(),
"Cannot listen to response without starting IDLE"
);
let sender = self.session.unsolicited_responses_tx.clone();
let interrupt = stop_token::StopSource::new();
let raw_stream = IdleStream::new(self);
let mut interruptible_stream = interrupt.stop_token().stop_stream(raw_stream);
let fut = async move {
while let Some(resp) = interruptible_stream.next().await {
let resp = resp?;
match resp.parsed() {
Response::Data { status, .. } if status == &Status::Ok => {
}
Response::Continue { .. } => {
}
Response::Done { .. } => {
handle_unilateral(resp, sender.clone()).await;
}
_ => return Ok(IdleResponse::NewData(resp)),
}
}
Ok(IdleResponse::ManualInterrupt)
};
(fut, interrupt)
}
pub fn wait_with_timeout(
&mut self,
timeout: Duration,
) -> (
impl Future<Output = Result<IdleResponse>> + '_,
stop_token::StopSource,
) {
assert!(
self.id.is_some(),
"Cannot listen to response without starting IDLE"
);
let (waiter, interrupt) = self.wait();
let fut = async move {
match async_std::future::timeout(timeout, waiter).await {
Ok(res) => res,
Err(_err) => Ok(IdleResponse::Timeout),
}
};
(fut, interrupt)
}
pub async fn init(&mut self) -> Result<()> {
let id = self.session.run_command("IDLE").await?;
self.id = Some(id);
while let Some(res) = self.session.stream.next().await {
let res = res?;
match res.parsed() {
Response::Continue { .. } => {
return Ok(());
}
Response::Done {
tag,
status,
information,
..
} => {
if tag == self.id.as_ref().unwrap() {
if let Status::Bad = status {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
information.unwrap().to_string(),
)
.into());
}
}
handle_unilateral(res, self.session.unsolicited_responses_tx.clone()).await;
}
_ => {
handle_unilateral(res, self.session.unsolicited_responses_tx.clone()).await;
}
}
}
Err(io::Error::new(io::ErrorKind::ConnectionRefused, "").into())
}
pub async fn done(mut self) -> Result<Session<T>> {
assert!(
self.id.is_some(),
"Cannot call DONE on a non initialized idle connection"
);
self.session.run_command_untagged("DONE").await?;
let sender = self.session.unsolicited_responses_tx.clone();
self.session
.check_ok(self.id.expect("invalid setup"), Some(sender))
.await?;
Ok(self.session)
}
}