112 lines
3.6 KiB
Rust
112 lines
3.6 KiB
Rust
use iced_futures::futures;
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// Just a little utility function
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pub fn file<T: ToString>(url: T) -> iced::Subscription<Progress> {
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iced::Subscription::from_recipe(Download {
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url: url.to_string(),
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})
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}
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pub struct Download {
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url: String,
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}
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// Make sure iced can use our download stream
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impl<H, I> iced_native::subscription::Recipe<H, I> for Download
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where
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H: std::hash::Hasher,
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{
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type Output = Progress;
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fn hash(&self, state: &mut H) {
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use std::hash::Hash;
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std::any::TypeId::of::<Self>().hash(state);
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self.url.hash(state);
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}
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fn stream(
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self: Box<Self>,
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_input: futures::stream::BoxStream<'static, I>,
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) -> futures::stream::BoxStream<'static, Self::Output> {
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Box::pin(futures::stream::unfold(
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State::Ready(self.url),
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|state| async move {
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match state {
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State::Ready(url) => {
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let response = reqwest::get(&url).await;
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match response {
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Ok(response) => {
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if let Some(total) = response.content_length() {
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Some((
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Progress::Started,
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State::Downloading {
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response,
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total,
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downloaded: 0,
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},
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))
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} else {
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Some((Progress::Errored, State::Finished))
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}
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}
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Err(_) => {
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Some((Progress::Errored, State::Finished))
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}
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}
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}
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State::Downloading {
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mut response,
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total,
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downloaded,
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} => match response.chunk().await {
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Ok(Some(chunk)) => {
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let downloaded = downloaded + chunk.len() as u64;
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let percentage =
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(downloaded as f32 / total as f32) * 100.0;
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Some((
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Progress::Advanced(percentage),
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State::Downloading {
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response,
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total,
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downloaded,
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},
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))
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}
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Ok(None) => Some((Progress::Finished, State::Finished)),
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Err(_) => Some((Progress::Errored, State::Finished)),
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},
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State::Finished => {
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// We do not let the stream die, as it would start a
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// new download repeatedly if the user is not careful
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// in case of errors.
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let _: () = iced::futures::future::pending().await;
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None
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}
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}
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},
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))
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}
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}
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#[derive(Debug, Clone)]
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pub enum Progress {
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Started,
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Advanced(f32),
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Finished,
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Errored,
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}
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pub enum State {
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Ready(String),
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Downloading {
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response: reqwest::Response,
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total: u64,
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downloaded: u64,
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},
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Finished,
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}
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