feat(wasi): add wasi crate support

Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>

Author: rvolosatovs

.github/workflows/ci.yml

@@ -108,6 +108,9 @@ jobs:
       - name: Check
         run: cargo check --target wasm32-unknown-unknown
 
+      - name: Test WASI
+        run: cargo test --features wasi
+
   minimal-versions:
     runs-on: ubuntu-latest
     steps:

Cargo.toml

@@ -40,6 +40,7 @@ std = []
 bytes = "1"
 fnv = "1.0.5"
 itoa = "1"
+wasi = { version = "0.13", optional = true }
 
 [dev-dependencies]
 quickcheck = "1"

src/header/map.rs

@@ -3872,6 +3872,41 @@ mod as_header_name {
     impl<'a> AsHeaderName for &'a String {}
 }
 
+#[cfg(feature = "wasi")]
+impl TryFrom<wasi::http::types::Fields> for HeaderMap {
+    type Error = Error;
+
+    fn try_from(fields: wasi::http::types::Fields) -> Result<Self, Self::Error> {
+        let mut headers = HeaderMap::new();
+        for (name, value) in fields.entries() {
+            let name = HeaderName::try_from(name)?;
+            let value = HeaderValue::try_from(value)?;
+            match headers.entry(name) {
+                Entry::Vacant(entry) => {
+                    entry.insert(value);
+                }
+                Entry::Occupied(mut entry) => {
+                    entry.append(value);
+                }
+            };
+        }
+        Ok(headers)
+    }
+}
+
+#[cfg(feature = "wasi")]
+impl TryFrom<HeaderMap> for wasi::http::types::Fields {
+    type Error = wasi::http::types::HeaderError;
+
+    fn try_from(headers: HeaderMap) -> Result<Self, Self::Error> {
+        let fields = wasi::http::types::Fields::new();
+        for (name, value) in &headers {
+            fields.append(&name.to_string(), &value.as_bytes().to_vec())?;
+        }
+        Ok(fields)
+    }
+}
+
 #[test]
 fn test_bounds() {
     fn check_bounds<T: Send + Send>() {}

src/method.rs

@@ -419,6 +419,45 @@ mod extension {
     }
 }
 
+#[cfg(feature = "wasi")]
+impl From<Method> for wasi::http::types::Method {
+    fn from(method: Method) -> Self {
+        match method {
+            Method(Get) => Self::Get,
+            Method(Head) => Self::Head,
+            Method(Post) => Self::Post,
+            Method(Put) => Self::Put,
+            Method(Delete) => Self::Delete,
+            Method(Connect) => Self::Connect,
+            Method(Options) => Self::Options,
+            Method(Trace) => Self::Trace,
+            Method(Patch) => Self::Patch,
+            Method(ExtensionInline(inline)) => Self::Other(inline.as_str().into()),
+            Method(ExtensionAllocated(allocated)) => Self::Other(allocated.as_str().into()),
+        }
+    }
+}
+
+#[cfg(feature = "wasi")]
+impl TryFrom<wasi::http::types::Method> for Method {
+    type Error = InvalidMethod;
+
+    fn try_from(method: wasi::http::types::Method) -> Result<Self, Self::Error> {
+        match method {
+            wasi::http::types::Method::Get => Ok(Self::GET),
+            wasi::http::types::Method::Head => Ok(Self::HEAD),
+            wasi::http::types::Method::Post => Ok(Self::POST),
+            wasi::http::types::Method::Put => Ok(Self::PUT),
+            wasi::http::types::Method::Delete => Ok(Self::DELETE),
+            wasi::http::types::Method::Connect => Ok(Self::CONNECT),
+            wasi::http::types::Method::Options => Ok(Self::OPTIONS),
+            wasi::http::types::Method::Trace => Ok(Self::TRACE),
+            wasi::http::types::Method::Patch => Ok(Self::PATCH),
+            wasi::http::types::Method::Other(method) => method.parse(),
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -482,4 +521,18 @@ mod test {
             );
         }
     }
+
+    #[cfg(feature = "wasi")]
+    #[test]
+    fn test_method_wasi_conv() {
+        use std::convert::TryInto;
+
+        let m: Method = wasi::http::types::Method::Get
+            .try_into()
+            .expect("failed to convert WASI method");
+        assert_eq!(m, Method::GET);
+
+        let m: wasi::http::types::Method = Method::GET.into();
+        assert!(matches!(m, wasi::http::types::Method::Get));
+    }
 }

src/uri/scheme.rs

@@ -335,6 +335,34 @@ impl From<Scheme2> for Scheme {
     }
 }
 
+#[cfg(feature = "wasi")]
+impl From<Scheme> for wasi::http::types::Scheme {
+    fn from(scheme: Scheme) -> Self {
+        use self::Protocol::*;
+        use self::Scheme2::*;
+
+        match scheme.inner {
+            Standard(Http) => Self::Http,
+            Standard(Https) => Self::Https,
+            Other(v) => Self::Other(v.to_string()),
+            None => unreachable!(),
+        }
+    }
+}
+
+#[cfg(feature = "wasi")]
+impl TryFrom<wasi::http::types::Scheme> for Scheme {
+    type Error = InvalidUri;
+
+    fn try_from(scheme: wasi::http::types::Scheme) -> Result<Self, Self::Error> {
+        match scheme {
+            wasi::http::types::Scheme::Http => Ok(Self::HTTP),
+            wasi::http::types::Scheme::Https => Ok(Self::HTTPS),
+            wasi::http::types::Scheme::Other(scheme) => scheme.parse(),
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -358,4 +386,18 @@ mod test {
     fn scheme(s: &str) -> Scheme {
         s.parse().expect(&format!("Invalid scheme: {}", s))
     }
+
+    #[cfg(feature = "wasi")]
+    #[test]
+    fn wasi_conv() {
+        use std::convert::TryInto;
+
+        let s: Scheme = wasi::http::types::Scheme::Http
+            .try_into()
+            .expect("failed to convert WASI scheme");
+        assert_eq!(s, Scheme::HTTP);
+
+        let s: wasi::http::types::Scheme = Scheme::HTTP.into();
+        assert!(matches!(s, wasi::http::types::Scheme::Http));
+    }
 }