Aode (lion)
e493e90dd4
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110 lines
2.7 KiB
Rust
110 lines
2.7 KiB
Rust
use crate::error::Error;
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use actix_web::web;
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use sha2::{digest::FixedOutputReset, Digest};
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use std::{
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pin::Pin,
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task::{Context, Poll},
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};
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use tokio::io::{AsyncRead, ReadBuf};
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pin_project_lite::pin_project! {
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pub(crate) struct Hasher<I, D> {
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#[pin]
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inner: I,
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hasher: D,
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}
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}
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impl<I, D> Hasher<I, D>
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where
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D: Digest + FixedOutputReset + Send + 'static,
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{
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pub(super) fn new(reader: I, digest: D) -> Self {
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Hasher {
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inner: reader,
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hasher: digest,
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}
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}
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pub(super) async fn finalize_reset(self) -> Result<Vec<u8>, Error> {
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let mut hasher = self.hasher;
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let hash = web::block(move || hasher.finalize_reset().to_vec()).await?;
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Ok(hash)
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}
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}
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impl<I, D> AsyncRead for Hasher<I, D>
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where
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I: AsyncRead,
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D: Digest,
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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 hasher = this.hasher;
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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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hasher.update(&buf.filled()[before_len..after_len]);
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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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($fut:expr) => {
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actix_rt::System::new().block_on(async move {
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let arbiter = actix_rt::Arbiter::new();
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let (tx, rx) = tracing::trace_span!(parent: None, "Create channel")
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.in_scope(|| tokio::sync::oneshot::channel());
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arbiter.spawn(async move {
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let handle = actix_rt::spawn($fut);
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let _ = tx.send(handle.await.unwrap());
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});
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rx.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 = 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 hasher = Hasher::new(file1, Sha256::new());
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tokio::io::copy(&mut hasher, &mut tokio::io::sink()).await?;
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hasher.finalize_reset().await
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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 mut hasher = Sha256::new();
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hasher.update(vec);
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let correct_hash = hasher.finalize_reset().to_vec();
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assert_eq!(hash, correct_hash);
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}
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}
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