Introduce unstable, incomplete WASM support

.travis.yml

@@ -47,10 +47,18 @@ matrix:
         #- rust: nightly
         #  env: FEATURES="--features socks"
 
+        # trust-dns
         #- rust: stable
         #- rust: nightly
         #  env: FEATURES="--features trust-dns"
 
+        # wasm
+        - name: "WASM"
+          env: TARGET=wasm32-unknown-unknown
+          rust: nightly
+          install: rustup target add "$TARGET"
+          script: cargo check --target "$TARGET"
+
         # android
         #- rust: stable
         - rust: nightly

Cargo.toml

@@ -17,13 +17,34 @@ publish = false
 [package.metadata.docs.rs]
 all-features = true
 
+[features]
+default = ["default-tls"]
+
+tls = []
+
+default-tls = ["hyper-tls", "native-tls", "tls", "tokio-tls"]
+default-tls-vendored = ["default-tls", "native-tls/vendored"]
+
+#rustls-tls = ["hyper-rustls", "tokio-rustls", "webpki-roots", "rustls", "tls"]
+
+blocking = ["futures-channel-preview", "futures-util-preview/io"]
+
+cookies = ["cookie_crate", "cookie_store"]
+
+gzip = ["async-compression"]
+
+#trust-dns = ["trust-dns-resolver"]
+
 [dependencies]
+http = "0.1.15"
+url = "2.1"
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 base64 = "0.10"
 bytes = "0.4"
 encoding_rs = "0.8"
 futures-core-preview = { version = "=0.3.0-alpha.18" }
 futures-util-preview = { version = "=0.3.0-alpha.18" }
-http = "0.1.15"
 http-body = "=0.2.0-alpha.1"
 hyper = "=0.13.0-alpha.2"
 log = "0.4"
@@ -32,13 +53,11 @@ mime_guess = "2.0"
 percent-encoding = "2.1"
 tokio = { version = "=0.2.0-alpha.5", default-features = false, features = ["rt-full", "tcp"] }
 tokio-executor = "=0.2.0-alpha.5"
-url = "2.1"
 uuid = { version = "0.7", features = ["v4"] }
 time = "0.1.42"
 
 # TODO: candidates for optional features
 
-
 serde = "1.0"
 serde_json = "1.0"
 serde_urlencoded = "0.6.1"
@@ -72,7 +91,7 @@ async-compression = { version = "0.1.0-alpha.4", default-features = false, featu
 ## trust-dns
 #trust-dns-resolver = { version = "0.11", optional = true }
 
-[dev-dependencies]
+[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 env_logger = "0.6"
 hyper = { version = "=0.13.0-alpha.2", features = ["unstable-stream"] }
 serde = { version = "1.0", features = ["derive"] }
@@ -80,28 +99,26 @@ libflate = "0.1"
 doc-comment = "0.3"
 tokio-fs = { version = "=0.2.0-alpha.5" }
 
-[features]
-default = ["default-tls"]
-
-tls = []
-
-default-tls = ["hyper-tls", "native-tls", "tls", "tokio-tls"]
-default-tls-vendored = ["default-tls", "native-tls/vendored"]
-
-# re-enable CI also
-#rustls-tls = ["hyper-rustls", "tokio-rustls", "webpki-roots", "rustls", "tls"]
-
-blocking = ["futures-channel-preview", "futures-util-preview/io"]
-
-cookies = ["cookie_crate", "cookie_store"]
-
-gzip = ["async-compression"]
-
-#trust-dns = ["trust-dns-resolver"]
-
 [target.'cfg(windows)'.dependencies]
 winreg = "0.6"
 
+# wasm
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+js-sys = "0.3.25"
+wasm-bindgen = "0.2.48"
+wasm-bindgen-futures = { version = "", features = ["futures_0_3"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.web-sys]
+version = "0.3.25"
+features = [
+    "Headers",
+    "Request",
+    "RequestInit",
+    "Response",
+    "Window",
+]
+
 [[example]]
 name = "blocking"
 path = "examples/blocking.rs"

src/error.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(target_arch = "wasm32", allow(unused))]
 use std::error::Error as StdError;
 use std::fmt;
 use std::io;
@@ -12,7 +13,7 @@ pub struct Error {
     inner: Box<Inner>,
 }
 
-type BoxError = Box<dyn StdError + Send + Sync>;
+pub(crate) type BoxError = Box<dyn StdError + Send + Sync>;
 
 struct Inner {
     kind: Kind,
@@ -213,6 +214,12 @@ pub(crate) fn url_bad_scheme(url: Url) -> Error {
     Error::new(Kind::Builder, Some("URL scheme is not allowed")).with_url(url)
 }
 
+if_wasm! {
+    pub(crate) fn wasm(js_val: wasm_bindgen::JsValue) -> BoxError {
+        format!("{:?}", js_val).into()
+    }
+}
+
 // io::Error helpers
 
 #[allow(unused)]

src/into_url.rs

@@ -37,14 +37,16 @@ impl<'a> PolyfillTryInto for &'a String {
     }
 }
 
-pub(crate) fn expect_uri(url: &Url) -> hyper::Uri {
-    url.as_str()
-        .parse()
-        .expect("a parsed Url should always be a valid Uri")
-}
+if_hyper! {
+    pub(crate) fn expect_uri(url: &Url) -> http::Uri {
+        url.as_str()
+            .parse()
+            .expect("a parsed Url should always be a valid Uri")
+    }
 
-pub(crate) fn try_uri(url: &Url) -> Option<hyper::Uri> {
-    url.as_str().parse().ok()
+    pub(crate) fn try_uri(url: &Url) -> Option<http::Uri> {
+        url.as_str().parse().ok()
+    }
 }
 
 #[cfg(test)]

src/lib.rs

@@ -175,60 +175,32 @@
 ////! - **trust-dns**: Enables a trust-dns async resolver instead of default
 ////!   threadpool using `getaddrinfo`.
 
-#[cfg(test)]
-#[macro_use]
-extern crate doc_comment;
+macro_rules! if_wasm {
+    ($($item:item)*) => {$(
+        #[cfg(target_arch = "wasm32")]
+        $item
+    )*}
+}
 
-#[cfg(test)]
-doctest!("../README.md");
+macro_rules! if_hyper {
+    ($($item:item)*) => {$(
+        #[cfg(not(target_arch = "wasm32"))]
+        $item
+    )*}
+}
 
-pub use hyper::header;
-pub use hyper::Method;
-pub use hyper::{StatusCode, Version};
-pub use url::ParseError as UrlError;
+pub use http::header;
+pub use http::Method;
+pub use http::{StatusCode, Version};
 pub use url::Url;
 
-pub use self::async_impl::{
-    multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response,
-};
-//pub use self::body::Body;
-//pub use self::client::{Client, ClientBuilder};
-pub use self::error::{Error, Result};
-pub use self::into_url::IntoUrl;
-pub use self::proxy::Proxy;
-pub use self::redirect::{RedirectAction, RedirectAttempt, RedirectPolicy};
-//pub use self::request::{Request, RequestBuilder};
-//pub use self::response::Response;
-#[cfg(feature = "tls")]
-pub use self::tls::{Certificate, Identity};
-
-// this module must be first because of the `try_` macro
+// universal mods
 #[macro_use]
 mod error;
-
-mod async_impl;
-#[cfg(feature = "blocking")]
-pub mod blocking;
-mod connect;
-#[cfg(feature = "cookies")]
-pub mod cookie;
-//#[cfg(feature = "trust-dns")]
-//mod dns;
 mod into_url;
-mod proxy;
-mod redirect;
-#[cfg(feature = "tls")]
-mod tls;
 
-//pub mod multipart;
-
-#[doc(hidden)]
-#[deprecated(note = "types moved to top of crate")]
-pub mod r#async {
-    pub use crate::async_impl::{
-        multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response,
-    };
-}
+pub use self::error::{Error, Result};
+pub use self::into_url::IntoUrl;
 
 /// Shortcut method to quickly make a `GET` request.
 ///
@@ -274,8 +246,56 @@ fn _assert_impls() {
     assert_send::<Request>();
     assert_send::<RequestBuilder>();
 
-    assert_send::<Response>();
+    #[cfg(not(target_arch = "wasm32"))]
+    {
+        assert_send::<Response>();
+    }
 
     assert_send::<Error>();
     assert_sync::<Error>();
 }
+
+if_hyper! {
+    #[cfg(test)]
+    #[macro_use]
+    extern crate doc_comment;
+
+    #[cfg(test)]
+    doctest!("../README.md");
+
+    pub use self::async_impl::{
+        multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response,
+    };
+    pub use self::proxy::Proxy;
+    pub use self::redirect::{RedirectAction, RedirectAttempt, RedirectPolicy};
+    #[cfg(feature = "tls")]
+    pub use self::tls::{Certificate, Identity};
+
+
+    mod async_impl;
+    #[cfg(feature = "blocking")]
+    pub mod blocking;
+    mod connect;
+    #[cfg(feature = "cookies")]
+    pub mod cookie;
+    //#[cfg(feature = "trust-dns")]
+    //mod dns;
+    mod proxy;
+    mod redirect;
+    #[cfg(feature = "tls")]
+    mod tls;
+
+    #[doc(hidden)]
+    #[deprecated(note = "types moved to top of crate")]
+    pub mod r#async {
+        pub use crate::async_impl::{
+            multipart, Body, Client, ClientBuilder, Request, RequestBuilder, Response,
+        };
+    }
+}
+
+if_wasm! {
+    mod wasm;
+
+    pub use self::wasm::{Body, Client, ClientBuilder, Request, RequestBuilder, Response};
+}

src/wasm/body.rs

@@ -0,0 +1,3 @@
+/// dox
+#[derive(Debug)]
+pub struct Body(());

src/wasm/client.rs

@@ -0,0 +1,162 @@
+use std::future::Future;
+use http::Method;
+use wasm_bindgen::UnwrapThrowExt as _;
+
+use crate::IntoUrl;
+use super::{Request, RequestBuilder, Response};
+
+/// dox
+#[derive(Clone, Debug)]
+pub struct Client(());
+
+/// dox
+#[derive(Debug)]
+pub struct ClientBuilder(());
+
+impl Client {
+    /// dox
+    pub fn new() -> Self {
+        Client::builder().build().unwrap_throw()
+    }
+
+    /// dox
+    pub fn builder() -> ClientBuilder {
+        ClientBuilder::new()
+    }
+
+    /// Convenience method to make a `GET` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn get<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::GET, url)
+    }
+
+    /// Convenience method to make a `POST` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn post<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::POST, url)
+    }
+
+    /// Convenience method to make a `PUT` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn put<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::PUT, url)
+    }
+
+    /// Convenience method to make a `PATCH` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn patch<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::PATCH, url)
+    }
+
+    /// Convenience method to make a `DELETE` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn delete<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::DELETE, url)
+    }
+
+    /// Convenience method to make a `HEAD` request to a URL.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn head<U: IntoUrl>(&self, url: U) -> RequestBuilder {
+        self.request(Method::HEAD, url)
+    }
+
+    /// Start building a `Request` with the `Method` and `Url`.
+    ///
+    /// Returns a `RequestBuilder`, which will allow setting headers and
+    /// request body before sending.
+    ///
+    /// # Errors
+    ///
+    /// This method fails whenever supplied `Url` cannot be parsed.
+    pub fn request<U: IntoUrl>(&self, method: Method, url: U) -> RequestBuilder {
+        let req = url.into_url().map(move |url| Request::new(method, url));
+        RequestBuilder::new(self.clone(), req)
+    }
+
+    pub(super) fn execute_request(&self, req: Request) -> impl Future<Output = crate::Result<Response>> {
+        fetch(req)
+    }
+}
+
+async fn fetch(req: Request) -> crate::Result<Response> {
+    // Build the js Request
+    let mut init = web_sys::RequestInit::new();
+    init.method(req.method().as_str());
+
+    let js_headers = web_sys::Headers::new()
+        .map_err(crate::error::wasm)
+        .map_err(crate::error::builder)?;
+
+    for (name, value) in req.headers() {
+        js_headers
+            .append(name.as_str(), value.to_str().map_err(crate::error::builder)?)
+            .map_err(crate::error::wasm)
+            .map_err(crate::error::builder)?;
+    }
+    init.headers(&js_headers.into());
+
+    let js_req = web_sys::Request::new_with_str_and_init(req.url().as_str(), &init)
+        .map_err(crate::error::wasm)
+        .map_err(crate::error::builder)?;
+
+    // Await the fetch() promise
+    let p = web_sys::window()
+        .expect("window should exist")
+        .fetch_with_request(&js_req);
+    let js_resp = super::promise::<web_sys::Response>(p)
+        .await
+        .map_err(crate::error::request)?;
+
+    // Convert from the js Response
+    let mut resp = http::Response::builder();
+    resp.status(js_resp.status());
+
+    // TODO: translate js_resp.headers()
+    /*
+    let js_headers = js_resp.headers();
+    let js_iter = js_sys::try_iter(&js_headers)
+        .expect_throw("headers try_iter")
+        .expect_throw("headers have an iterator");
+
+    for item in js_iter {
+        let item = item.expect_throw("headers iterator doesn't throw");
+    }
+    */
+
+    resp.body(js_resp)
+        .map(Response::new)
+        .map_err(crate::error::request)
+}
+
+// ===== impl ClientBuilder =====
+
+impl ClientBuilder {
+    /// dox
+    pub fn new() -> Self {
+        ClientBuilder(())
+    }
+
+    /// dox
+    pub fn build(self) -> Result<Client, crate::Error> {
+        Ok(Client(()))
+    }
+
+}

src/wasm/mod.rs

@@ -0,0 +1,29 @@
+use wasm_bindgen::JsCast;
+
+mod body;
+mod client;
+mod request;
+mod response;
+
+pub use self::body::Body;
+pub use self::client::{Client, ClientBuilder};
+pub use self::request::{Request, RequestBuilder};
+pub use self::response::Response;
+
+
+async fn promise<T>(promise: js_sys::Promise) -> Result<T, crate::error::BoxError>
+where
+    T: JsCast,
+{
+    use wasm_bindgen_futures::futures_0_3::JsFuture;
+
+    let js_val = JsFuture::from(promise)
+        .await
+        .map_err(crate::error::wasm)?;
+
+    js_val
+        .dyn_into::<T>()
+        .map_err(|_js_val| {
+            "promise resolved to unexpected type".into()
+        })
+}

src/wasm/request.rs

@@ -0,0 +1,144 @@
+use std::fmt;
+
+use http::{Method, HeaderMap};
+use url::Url;
+
+use super::{Body, Client, Response};
+
+/// A request which can be executed with `Client::execute()`.
+pub struct Request {
+    method: Method,
+    url: Url,
+    headers: HeaderMap,
+    body: Option<Body>,
+}
+
+/// A builder to construct the properties of a `Request`.
+pub struct RequestBuilder {
+    client: Client,
+    request: crate::Result<Request>,
+}
+
+impl Request {
+    pub(super) fn new(method: Method, url: Url) -> Self {
+        Request {
+            method,
+            url,
+            headers: HeaderMap::new(),
+            body: None,
+        }
+    }
+
+    /// Get the method.
+    #[inline]
+    pub fn method(&self) -> &Method {
+        &self.method
+    }
+
+    /// Get a mutable reference to the method.
+    #[inline]
+    pub fn method_mut(&mut self) -> &mut Method {
+        &mut self.method
+    }
+
+    /// Get the url.
+    #[inline]
+    pub fn url(&self) -> &Url {
+        &self.url
+    }
+
+    /// Get a mutable reference to the url.
+    #[inline]
+    pub fn url_mut(&mut self) -> &mut Url {
+        &mut self.url
+    }
+
+    /// Get the headers.
+    #[inline]
+    pub fn headers(&self) -> &HeaderMap {
+        &self.headers
+    }
+
+    /// Get a mutable reference to the headers.
+    #[inline]
+    pub fn headers_mut(&mut self) -> &mut HeaderMap {
+        &mut self.headers
+    }
+
+    /// Get the body.
+    #[inline]
+    pub fn body(&self) -> Option<&Body> {
+        self.body.as_ref()
+    }
+
+    /// Get a mutable reference to the body.
+    #[inline]
+    pub fn body_mut(&mut self) -> &mut Option<Body> {
+        &mut self.body
+    }
+}
+
+impl RequestBuilder {
+    pub(super) fn new(client: Client, request: crate::Result<Request>) -> RequestBuilder {
+        RequestBuilder { client, request }
+    }
+
+
+    /// Set the request body.
+    pub fn body<T: Into<Body>>(mut self, body: T) -> RequestBuilder {
+        if let Ok(ref mut req) = self.request {
+            req.body = Some(body.into());
+        }
+        self
+    }
+
+    /// Constructs the Request and sends it to the target URL, returning a
+    /// future Response.
+    ///
+    /// # Errors
+    ///
+    /// This method fails if there was an error while sending request.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// # use reqwest::Error;
+    /// #
+    /// # async fn run() -> Result<(), Error> {
+    /// let response = reqwest::Client::new()
+    ///     .get("https://hyper.rs")
+    ///     .send()
+    ///     .await?;
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub async fn send(self) -> crate::Result<Response> {
+        let req = self.request?;
+        self.client.execute_request(req).await
+    }
+}
+
+impl fmt::Debug for Request {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt_request_fields(&mut f.debug_struct("Request"), self).finish()
+    }
+}
+
+impl fmt::Debug for RequestBuilder {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut builder = f.debug_struct("RequestBuilder");
+        match self.request {
+            Ok(ref req) => fmt_request_fields(&mut builder, req).finish(),
+            Err(ref err) => builder.field("error", err).finish(),
+        }
+    }
+}
+
+fn fmt_request_fields<'a, 'b>(
+    f: &'a mut fmt::DebugStruct<'a, 'b>,
+    req: &Request,
+) -> &'a mut fmt::DebugStruct<'a, 'b> {
+    f.field("method", &req.method)
+        .field("url", &req.url)
+        .field("headers", &req.headers)
+}

src/wasm/response.rs

@@ -0,0 +1,73 @@
+use std::fmt;
+
+use http::{HeaderMap, StatusCode};
+
+/// A Response to a submitted `Request`.
+pub struct Response {
+    http: http::Response<web_sys::Response>,
+}
+
+impl Response {
+    pub(super) fn new(
+        res: http::Response<web_sys::Response>,
+        //url: Url,
+    ) -> Response {
+        Response {
+            http: res,
+        }
+    }
+
+    /// Get the `StatusCode` of this `Response`.
+    #[inline]
+    pub fn status(&self) -> StatusCode {
+        self.http.status()
+    }
+
+    /// Get the `Headers` of this `Response`.
+    #[inline]
+    pub fn headers(&self) -> &HeaderMap {
+        self.http.headers()
+    }
+
+    /// Get a mutable reference to the `Headers` of this `Response`.
+    #[inline]
+    pub fn headers_mut(&mut self) -> &mut HeaderMap {
+        self.http.headers_mut()
+    }
+
+    /* It might not be possible to detect this in JS?
+    /// Get the HTTP `Version` of this `Response`.
+    #[inline]
+    pub fn version(&self) -> Version {
+        self.http.version()
+    }
+    */
+
+    // pub async fn json()
+
+
+    /// Get the response text.
+    pub async fn text(self) -> crate::Result<String> {
+        let p = self.http.body().text()
+            .map_err(crate::error::wasm)
+            .map_err(crate::error::decode)?;
+        let js_val = super::promise::<wasm_bindgen::JsValue>(p)
+            .await
+            .map_err(crate::error::decode)?;
+        if let Some(s) = js_val.as_string() {
+            Ok(s)
+        } else {
+            Err(crate::error::decode("response.text isn't string"))
+        }
+    }
+}
+
+impl fmt::Debug for Response {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Response")
+            //.field("url", self.url())
+            .field("status", &self.status())
+            .field("headers", self.headers())
+            .finish()
+    }
+}