Use spawn blocking instead of block in place

http-signature-normalization-reqwest/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "http-signature-normalization-reqwest"
 description = "An HTTP Signatures library that leaves the signing to you"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["asonix <asonix@asonix.dog>"]
 license-file = "LICENSE"
 readme = "README.md"
@@ -31,7 +31,7 @@ reqwest = "0.10.8"
 sha2 = { version = "0.9", optional = true }
 sha3 = { version = "0.9", optional = true }
 thiserror = "1.0"
-tokio = { version = "0.2", default-features = false, features = ["rt-threaded", "blocking"], optional = true }
+tokio = { version = "0.2", default-features = false, features = ["blocking"], optional = true }
 
 [dev-dependencies]
 pretty_env_logger = "0.4"

http-signature-normalization-reqwest/src/digest/mod.rs

@@ -73,7 +73,12 @@ impl SignExt for RequestBuilder {
         Self: Sized,
     {
         Box::pin(async move {
-            let digest = tokio::task::block_in_place(|| digest.compute(v.as_ref()));
+            let (v, digest) = tokio::task::spawn_blocking(move || {
+                let digest = digest.compute(v.as_ref());
+                (v, digest)
+            })
+            .await
+            .map_err(|_| SignError::Canceled)?;
 
             let c = self
                 .header("Digest", format!("{}={}", D::NAME, digest))

http-signature-normalization-reqwest/src/lib.rs

@@ -70,6 +70,9 @@ pub enum SignError {
 
     #[error("Cannot sign request with body already present")]
     BodyPresent,
+
+    #[error("Panic in spawn blocking")]
+    Canceled,
 }
 
 impl Config {