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use iced_futures::futures;
// Just a little utility function
pub fn file<T: ToString>(url: T) -> iced::Subscription<DownloadMessage> {
iced::Subscription::from_recipe(Downloader {
url: url.to_string(),
})
}
pub struct Downloader {
url: String,
}
// Make sure iced can use our download stream
impl<H, I> iced_native::subscription::Recipe<H, I> for Downloader
where
H: std::hash::Hasher,
{
type Output = DownloadMessage;
fn hash(&self, state: &mut H) {
use std::hash::Hash;
std::any::TypeId::of::<Self>().hash(state);
}
fn stream(
self: Box<Self>,
_input: futures::stream::BoxStream<'static, I>,
) -> futures::stream::BoxStream<'static, Self::Output> {
use isahc::prelude::*;
Box::pin(futures::stream::unfold(
DownloadState::Ready(self.url),
|state| async move {
match state {
DownloadState::Ready(url) => {
let resp = Request::get(&url)
.metrics(true)
.body(())
.unwrap()
.send_async()
.await
.unwrap();
let metrics = resp.metrics().unwrap().clone();
// If you actually want to download:
/*let file = async_std::fs::File::create("download.bin")
.await
.unwrap();*/
async_std::task::spawn(async_std::io::copy(
resp.into_body(),
async_std::io::sink(), //file
));
Some((
DownloadMessage::DownloadStarted,
DownloadState::Downloading(metrics),
))
}
DownloadState::Downloading(metrics) => {
async_std::task::sleep(
std::time::Duration::from_millis(100),
)
.await;
let percentage = metrics.download_progress().0 * 100
/ metrics.download_progress().1;
if percentage == 100 {
Some((
DownloadMessage::Done,
DownloadState::Finished,
))
} else {
Some((
DownloadMessage::Downloading(percentage),
DownloadState::Downloading(metrics),
))
}
}
DownloadState::Finished => None,
}
},
))
}
}
#[derive(Debug)]
pub enum DownloadMessage {
DownloadStarted,
Downloading(u64),
Done,
}
pub enum DownloadState {
Ready(String),
Downloading(isahc::Metrics),
Finished,
}
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