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use super::File;
use futures::{Future, Poll};
use std::fs::File as StdFile;
use std::fs::Metadata;
use std::io;
const POLL_AFTER_RESOLVE: &str = "Cannot poll MetadataFuture after it resolves";
#[derive(Debug)]
pub struct MetadataFuture {
file: Option<File>,
}
impl MetadataFuture {
pub(crate) fn new(file: File) -> Self {
MetadataFuture { file: Some(file) }
}
fn std(&mut self) -> &mut StdFile {
self.file.as_mut().expect(POLL_AFTER_RESOLVE).std()
}
}
impl Future for MetadataFuture {
type Item = (File, Metadata);
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let metadata = try_ready!(::blocking_io(|| {
StdFile::metadata(self.std())
}));
let file = self.file.take().expect(POLL_AFTER_RESOLVE);
Ok((file, metadata).into())
}
}