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mod call;
use bytes::Bytes;
use call::{Encoding, GrpcWebCall};
use core::{
fmt,
task::{Context, Poll},
};
use futures::{Future, Stream, TryStreamExt};
use http::{header::HeaderName, request::Request, response::Response, HeaderMap, HeaderValue};
use http_body::Body;
use js_sys::{Array, Uint8Array};
use std::{error::Error, pin::Pin};
use tonic::{body::BoxBody, client::GrpcService, Status};
use wasm_bindgen::{JsCast, JsValue};
use wasm_bindgen_futures::JsFuture;
use wasm_streams::ReadableStream;
use web_sys::{Headers, RequestInit};
#[derive(Debug, Clone, PartialEq)]
pub enum ClientError {
Err,
FetchFailed(JsValue),
}
impl Error for ClientError {}
impl fmt::Display for ClientError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self)
}
}
pub type CredentialsMode = web_sys::RequestCredentials;
pub type RequestMode = web_sys::RequestMode;
#[derive(Clone)]
pub struct Client {
base_uri: String,
credentials: CredentialsMode,
mode: RequestMode,
encoding: Encoding,
}
impl Client {
pub fn new(base_uri: String) -> Self {
Client {
base_uri,
credentials: CredentialsMode::SameOrigin,
mode: RequestMode::Cors,
encoding: Encoding::None,
}
}
async fn request(self, rpc: Request<BoxBody>) -> Result<Response<BoxBody>, ClientError> {
let mut uri = rpc.uri().to_string();
uri.insert_str(0, &self.base_uri);
let headers = Headers::new().unwrap();
for (k, v) in rpc.headers().iter() {
headers.set(k.as_str(), v.to_str().unwrap()).unwrap();
}
headers.set("x-user-agent", "grpc-web-rust/0.1").unwrap();
headers.set("x-grpc-web", "1").unwrap();
headers
.set("content-type", self.encoding.to_content_type())
.unwrap();
let body_bytes = hyper::body::to_bytes(rpc.into_body()).await.unwrap();
let body_array: Uint8Array = body_bytes.as_ref().into();
let body_js: &JsValue = body_array.as_ref();
let mut init = RequestInit::new();
init.method("POST")
.mode(self.mode)
.credentials(self.credentials)
.body(Some(body_js))
.headers(headers.as_ref());
let request = web_sys::Request::new_with_str_and_init(&uri, &init).unwrap();
let window = web_sys::window().unwrap();
let fetch = JsFuture::from(window.fetch_with_request(&request))
.await
.map_err(ClientError::FetchFailed)?;
let fetch_res: web_sys::Response = fetch.dyn_into().unwrap();
let mut res = Response::builder().status(fetch_res.status());
let headers = res.headers_mut().unwrap();
for kv in js_sys::try_iter(fetch_res.headers().as_ref())
.unwrap()
.unwrap()
{
let pair: Array = kv.unwrap().into();
headers.append(
HeaderName::from_bytes(pair.get(0).as_string().unwrap().as_bytes()).unwrap(),
HeaderValue::from_str(&pair.get(1).as_string().unwrap()).unwrap(),
);
}
let body_stream = ReadableStream::from_raw(fetch_res.body().unwrap().unchecked_into());
let body = GrpcWebCall::client_response(
ReadableStreamBody::new(body_stream),
Encoding::from_content_type(headers),
);
Ok(res.body(BoxBody::new(body)).unwrap())
}
}
impl GrpcService<BoxBody> for Client {
type ResponseBody = BoxBody;
type Error = ClientError;
type Future = Pin<Box<dyn Future<Output = Result<Response<BoxBody>, ClientError>>>>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, rpc: Request<BoxBody>) -> Self::Future {
Box::pin(self.clone().request(rpc))
}
}
struct ReadableStreamBody {
stream: Pin<Box<dyn Stream<Item = Result<Bytes, Status>>>>,
}
impl ReadableStreamBody {
fn new(inner: ReadableStream) -> Self {
ReadableStreamBody {
stream: Box::pin(
inner
.into_stream()
.map_ok(|buf_js| {
let buffer = Uint8Array::new(&buf_js);
let mut bytes_vec = vec![0; buffer.length() as usize];
buffer.copy_to(&mut bytes_vec);
let bytes: Bytes = bytes_vec.into();
bytes
})
.map_err(|_| Status::unknown("readablestream error")),
),
}
}
}
impl Body for ReadableStreamBody {
type Data = Bytes;
type Error = Status;
fn poll_data(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Self::Data, Self::Error>>> {
self.stream.as_mut().poll_next(cx)
}
fn poll_trailers(
self: Pin<&mut Self>,
_: &mut Context<'_>,
) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
Poll::Ready(Ok(None))
}
fn is_end_stream(&self) -> bool {
false
}
}
unsafe impl Sync for ReadableStreamBody {}
unsafe impl Send for ReadableStreamBody {}
unsafe impl Sync for ClientError {}
unsafe impl Send for ClientError {}