Add support for core http crate binding

Signed-off-by: Dejan Bosanac <dejan@sensatic.net>

Cargo.toml

@@ -17,6 +17,7 @@ categories = ["web-programming", "encoding", "data-structures"]
 name = "cloudevents"
 
 [features]
+http-binding = ["async-trait", "bytes", "futures", "http"]
 actix = ["actix-web", "async-trait", "bytes", "futures", "http"]
 reqwest = ["reqwest-lib", "async-trait", "bytes", "http"]
 rdkafka = ["rdkafka-lib", "bytes", "futures"]
@@ -43,17 +44,20 @@ bytes = { version = "^1.0", optional = true }
 futures = { version = "^0.3", optional = true }
 http = { version = "0.2", optional = true }
 hyper = { version = "^0.14", optional = true }
-axum-lib = { version = "^0.2", optional = true , package="axum"}
+axum-lib = { version = "^0.2", optional = true, package="axum"}
 http-body = { version = "^0.4", optional = true}
 
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies]
 hostname = "^0.3"
 uuid = { version = "^0.8", features = ["v4"] }
 
-[target.'cfg(target_arch = "wasm32")'.dependencies]
+[target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
 web-sys = { version = "^0.3", features = ["Window", "Location"] }
 uuid = { version = "^0.8", features = ["v4", "wasm-bindgen"] }
 
+[target.'cfg(all(target_arch = "wasm32", target_os="wasi"))'.dependencies]
+uuid = { version = "^0.8", features = ["v4"] }
+
 [dev-dependencies]
 rstest = "0.6"
 claim = "0.3.1"

src/binding/http/mod.rs

@@ -1,5 +1,5 @@
 pub mod builder;
-mod deserializer;
+pub mod deserializer;
 mod headers;
 
 use crate::{
@@ -11,7 +11,11 @@ pub use headers::Headers;
 mod serializer;
 
 pub use builder::Builder;
+use core::convert::TryFrom;
+use http::Response;
 pub use serializer::Serializer;
+use std::convert::TryInto;
+use std::fmt::Debug;
 
 pub static SPEC_VERSION_HEADER: &str = "ce-specversion";
 
@@ -26,3 +30,42 @@ pub fn to_event<'a, T: Headers<'a>>(
 pub fn header_prefix(name: &str) -> String {
     super::header_prefix("ce-", name)
 }
+
+impl<T> TryFrom<Response<T>> for Event
+where
+    T: TryInto<Vec<u8>>,
+    <T as TryInto<Vec<u8>>>::Error: Debug,
+{
+    type Error = crate::message::Error;
+
+    fn try_from(response: Response<T>) -> Result<Self, Self::Error> {
+        let headers = response.headers().to_owned();
+        let body = T::try_into(response.into_body()).unwrap();
+
+        to_event(&headers, body)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::test::fixtures;
+    use crate::Event;
+    use core::convert::TryFrom;
+    use http::Response;
+
+    #[test]
+    fn test_response_to_event() {
+        let event = fixtures::v10::minimal_string_extension();
+
+        let response = Response::builder()
+            .header("ce-id", fixtures::id())
+            .header("ce-source", fixtures::source())
+            .header("ce-type", fixtures::ty())
+            .header("ce-specversion", "1.0")
+            .header("ce-someint", "10")
+            .body(Vec::new())
+            .unwrap();
+
+        assert_eq!(event, Event::try_from(response).unwrap());
+    }
+}

src/binding/http/serializer.rs

@@ -6,7 +6,14 @@ use crate::binding::{
     CLOUDEVENTS_JSON_HEADER,
 };
 use crate::event::SpecVersion;
-use crate::message::{BinarySerializer, MessageAttributeValue, Result, StructuredSerializer};
+use crate::message::BinaryDeserializer;
+use crate::message::{
+    BinarySerializer, Error, MessageAttributeValue, Result, StructuredSerializer,
+};
+use crate::Event;
+use http::Request;
+use std::convert::TryFrom;
+use std::fmt::Debug;
 
 macro_rules! str_to_header_value {
     ($header_value:expr) => {
@@ -70,3 +77,81 @@ impl<T> StructuredSerializer<T> for Serializer<T> {
         builder.body(bytes)
     }
 }
+
+impl<T> BinarySerializer<http::request::Request<Option<T>>> for http::request::Builder
+where
+    T: TryFrom<Vec<u8>>,
+    <T as TryFrom<Vec<u8>>>::Error: Debug,
+{
+    fn set_spec_version(mut self, sv: SpecVersion) -> Result<Self> {
+        self = self.header(SPEC_VERSION_HEADER, &sv.to_string());
+        Ok(self)
+    }
+
+    fn set_attribute(mut self, name: &str, value: MessageAttributeValue) -> Result<Self> {
+        let key = &header_prefix(name);
+        self = self.header(key, &value.to_string());
+        Ok(self)
+    }
+
+    fn set_extension(mut self, name: &str, value: MessageAttributeValue) -> Result<Self> {
+        let key = &header_prefix(name);
+        self = self.header(key, &value.to_string());
+        Ok(self)
+    }
+
+    fn end_with_data(self, bytes: Vec<u8>) -> Result<http::request::Request<Option<T>>> {
+        let body = T::try_from(bytes).unwrap();
+        self.body(Some(body)).map_err(|e| Error::Other {
+            source: Box::new(e),
+        })
+    }
+
+    fn end(self) -> Result<http::request::Request<Option<T>>> {
+        self.body(None).map_err(|e| Error::Other {
+            source: Box::new(e),
+        })
+    }
+}
+
+impl<T> TryFrom<Event> for Request<Option<T>>
+where
+    T: TryFrom<Vec<u8>>,
+    <T as TryFrom<Vec<u8>>>::Error: Debug,
+{
+    type Error = crate::message::Error;
+
+    fn try_from(event: Event) -> Result<Self> {
+        BinaryDeserializer::deserialize_binary(event, http::request::Builder::new())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::test::fixtures;
+    use bytes::Bytes;
+    use http::Request;
+    use std::convert::TryFrom;
+
+    #[test]
+    fn test_event_to_http_request() {
+        let event = fixtures::v10::minimal_string_extension();
+        let request: Request<Option<Vec<u8>>> = Request::try_from(event).unwrap();
+
+        assert_eq!(request.headers()["ce-id"], "0001");
+        assert_eq!(request.headers()["ce-type"], "test_event.test_application");
+    }
+
+    #[test]
+    fn test_event_to_bytes_body() {
+        let event = fixtures::v10::full_binary_json_data_string_extension();
+        let request: Request<Option<Vec<u8>>> = Request::try_from(event).unwrap();
+
+        assert_eq!(request.headers()["ce-id"], "0001");
+        assert_eq!(request.headers()["ce-type"], "test_event.test_application");
+        assert_eq!(
+            request.body().as_ref().unwrap(),
+            &Bytes::from(fixtures::json_data().to_string())
+        );
+    }
+}

src/binding/mod.rs

@@ -5,6 +5,7 @@ pub mod actix;
 #[cfg(feature = "axum")]
 pub mod axum;
 #[cfg(any(
+    feature = "http-binding",
     feature = "actix",
     feature = "warp",
     feature = "reqwest",

src/event/attributes.rs

@@ -268,7 +268,7 @@ pub(crate) fn default_hostname() -> Url {
     .unwrap()
 }
 
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
 pub(crate) fn default_hostname() -> Url {
     use std::str::FromStr;
 
@@ -281,3 +281,10 @@ pub(crate) fn default_hostname() -> Url {
     )
     .unwrap()
 }
+
+#[cfg(all(target_arch = "wasm32", target_os = "wasi"))]
+pub(crate) fn default_hostname() -> Url {
+    use std::str::FromStr;
+
+    Url::from_str("http://localhost").unwrap()
+}