123 lines
3 KiB
Rust
123 lines
3 KiB
Rust
use sha2::{digest::FixedOutputReset, Digest, Sha256};
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use std::{
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cell::RefCell,
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pin::Pin,
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rc::Rc,
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task::{Context, Poll},
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};
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use tokio::io::{AsyncRead, ReadBuf};
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pub(super) struct State {
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hasher: Sha256,
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size: u64,
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}
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pin_project_lite::pin_project! {
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pub(crate) struct Hasher<I> {
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#[pin]
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inner: I,
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state: Rc<RefCell<State>>,
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}
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}
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impl<I> Hasher<I> {
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pub(super) fn new(reader: I) -> Self {
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Hasher {
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inner: reader,
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state: Rc::new(RefCell::new(State {
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hasher: Sha256::new(),
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size: 0,
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})),
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}
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}
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pub(super) fn state(&self) -> Rc<RefCell<State>> {
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Rc::clone(&self.state)
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}
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}
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impl State {
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pub(super) fn finalize_reset(&mut self) -> ([u8; 32], u64) {
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let arr = self.hasher.finalize_fixed_reset().into();
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(arr, self.size)
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}
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}
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impl<I> AsyncRead for Hasher<I>
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where
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I: AsyncRead,
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{
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fn poll_read(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut ReadBuf<'_>,
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) -> Poll<std::io::Result<()>> {
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let this = self.as_mut().project();
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let reader = this.inner;
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let state = this.state;
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let before_len = buf.filled().len();
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let poll_res = reader.poll_read(cx, buf);
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let after_len = buf.filled().len();
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if after_len > before_len {
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let mut guard = state.borrow_mut();
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guard.hasher.update(&buf.filled()[before_len..after_len]);
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guard.size += u64::try_from(after_len - before_len).expect("Size is reasonable");
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}
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poll_res
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}
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}
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#[cfg(test)]
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mod test {
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use super::Hasher;
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use sha2::{Digest, Sha256};
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use std::io::Read;
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macro_rules! test_on_arbiter {
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($fut:expr) => {
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actix_web::rt::System::new().block_on(async move {
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let arbiter = actix_web::rt::Arbiter::new();
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let (tx, rx) = crate::sync::channel(1);
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arbiter.spawn(async move {
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let handle = crate::sync::spawn($fut);
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let _ = tx.send(handle.await.unwrap());
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});
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rx.into_recv_async().await.unwrap()
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})
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};
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}
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#[test]
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fn hasher_works() {
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let (hash, size) = test_on_arbiter!(async move {
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let file1 = tokio::fs::File::open("./client-examples/earth.gif").await?;
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let mut reader = Hasher::new(file1);
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tokio::io::copy(&mut reader, &mut tokio::io::sink()).await?;
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Ok(reader.state().borrow_mut().finalize_reset()) as std::io::Result<_>
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})
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.unwrap();
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let mut file = std::fs::File::open("./client-examples/earth.gif").unwrap();
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let mut vec = Vec::new();
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file.read_to_end(&mut vec).unwrap();
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let correct_size = vec.len() as u64;
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let mut hasher = Sha256::new();
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hasher.update(vec);
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let correct_hash: [u8; 32] = hasher.finalize_reset().into();
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assert_eq!(hash, correct_hash);
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assert_eq!(size, correct_size);
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}
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}
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