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-rw-r--r--src/util/async_hash.rs64
1 files changed, 64 insertions, 0 deletions
diff --git a/src/util/async_hash.rs b/src/util/async_hash.rs
new file mode 100644
index 00000000..fa8ee7ff
--- /dev/null
+++ b/src/util/async_hash.rs
@@ -0,0 +1,64 @@
+use bytes::Bytes;
+use digest::Digest;
+
+use tokio::sync::{mpsc, oneshot};
+use tokio::task::JoinHandle;
+
+use crate::data::*;
+
+/// Compute the sha256 of a slice,
+/// spawning on a tokio thread for CPU-intensive processing
+/// The argument has to be an owned Bytes, as it is moved out to a new thread.
+pub async fn async_sha256sum(data: Bytes) -> Hash {
+ tokio::task::spawn_blocking(move || sha256sum(&data))
+ .await
+ .unwrap()
+}
+
+/// Compute the blake2sum of a slice,
+/// spawning on a tokio thread for CPU-intensive processing.
+/// The argument has to be an owned Bytes, as it is moved out to a new thread.
+pub async fn async_blake2sum(data: Bytes) -> Hash {
+ tokio::task::spawn_blocking(move || blake2sum(&data))
+ .await
+ .unwrap()
+}
+
+// ----
+
+pub struct AsyncHasher<D: Digest> {
+ sendblk: mpsc::UnboundedSender<(Bytes, oneshot::Sender<()>)>,
+ task: JoinHandle<digest::Output<D>>,
+}
+
+impl<D: Digest> AsyncHasher<D> {
+ pub fn new() -> Self {
+ let (sendblk, mut recvblk) = mpsc::unbounded_channel::<(Bytes, oneshot::Sender<()>)>();
+ let task = tokio::task::spawn_blocking(move || {
+ let mut digest = D::new();
+ while let Some((blk, ch)) = recvblk.blocking_recv() {
+ digest.update(&blk[..]);
+ let _ = ch.send(());
+ }
+ digest.finalize()
+ });
+ Self { sendblk, task }
+ }
+
+ pub async fn update(&self, b: Bytes) {
+ let (tx, rx) = oneshot::channel();
+ self.sendblk.send((b, tx)).unwrap();
+ let _ = rx.await;
+ }
+
+ pub async fn finalize(self) -> digest::Output<D> {
+ drop(self.sendblk);
+ self.task.await.unwrap()
+ }
+}
+
+impl<D: Digest> Default for AsyncHasher<D> {
+ fn default() -> Self {
+ Self::new()
+ }
+}