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Simplify run and unfold helpers to build a Subscription

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This commit is contained in:
Héctor Ramón Jiménez 2022-01-17 15:29:41 +07:00
parent 88f1168a0b
commit ddbbe7353b
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GPG key ID: 140CC052C94F138E
2 changed files with 69 additions and 96 deletions
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122
examples/download_progress/src/download.rs
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@ -1,22 +1,15 @@
use futures::Stream;
use iced_futures::futures;
use iced_native::subscription;
use std::hash::Hash;
// Just a little utility function
pub fn file<I: 'static + Hash + Copy + Send, T: ToString>(
pub fn file<I: 'static + Hash + Copy + Send + Sync, T: ToString>(
id: I,
url: T,
) -> iced::Subscription<(I, Progress)> {
subscription::run(
id,
Download {
id,
url: url.to_string(),
},
download,
)
subscription::unfold(id, State::Ready(url.to_string()), move |state| {
download(id, state)
})
}
#[derive(Debug, Hash, Clone)]
@ -25,74 +18,63 @@ pub struct Download<I> {
url: String,
}
fn download<I: Copy>(
download: Download<I>,
) -> impl Stream<Item = (I, Progress)> {
let id = download.id;
async fn download<I: Copy>(
id: I,
state: State,
) -> (Option<(I, Progress)>, State) {
match state {
State::Ready(url) => {
let response = reqwest::get(&url).await;
futures::stream::unfold(
State::Ready(download.url),
move |state| async move {
match state {
State::Ready(url) => {
let response = reqwest::get(&url).await;
match response {
Ok(response) => {
if let Some(total) = response.content_length() {
Some((
(id, Progress::Started),
State::Downloading {
response,
total,
downloaded: 0,
},
))
} else {
Some(((id, Progress::Errored), State::Finished))
}
}
Err(_) => {
Some(((id, Progress::Errored), State::Finished))
}
}
}
State::Downloading {
mut response,
total,
downloaded,
} => match response.chunk().await {
Ok(Some(chunk)) => {
let downloaded = downloaded + chunk.len() as u64;
let percentage =
(downloaded as f32 / total as f32) * 100.0;
Some((
(id, Progress::Advanced(percentage)),
match response {
Ok(response) => {
if let Some(total) = response.content_length() {
(
Some((id, Progress::Started)),
State::Downloading {
response,
total,
downloaded,
downloaded: 0,
},
))
)
} else {
(Some((id, Progress::Errored)), State::Finished)
}
Ok(None) => {
Some(((id, Progress::Finished), State::Finished))
}
Err(_) => Some(((id, Progress::Errored), State::Finished)),
},
State::Finished => {
// We do not let the stream die, as it would start a
// new download repeatedly if the user is not careful
// in case of errors.
let _: () = iced::futures::future::pending().await;
None
}
Err(_) => (Some((id, Progress::Errored)), State::Finished),
}
}
State::Downloading {
mut response,
total,
downloaded,
} => match response.chunk().await {
Ok(Some(chunk)) => {
let downloaded = downloaded + chunk.len() as u64;
let percentage = (downloaded as f32 / total as f32) * 100.0;
(
Some((id, Progress::Advanced(percentage))),
State::Downloading {
response,
total,
downloaded,
},
)
}
Ok(None) => (Some((id, Progress::Finished)), State::Finished),
Err(_) => (Some((id, Progress::Errored)), State::Finished),
},
)
State::Finished => {
// We do not let the stream die, as it would start a
// new download repeatedly if the user is not careful
// in case of errors.
let _: () = iced::futures::future::pending().await;
unreachable!()
}
}
}
#[derive(Debug, Clone)]