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feat(wasm): unblock streams in the browser
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| //! Streams that work with HTTP POST requests | ||
| use crate::util::GrpcResponse; | ||
| use futures::{ | ||
| stream::{self, Stream, StreamExt}, | ||
| Future, | ||
| }; | ||
| use reqwest::Response; | ||
| use serde::{de::DeserializeOwned, Deserialize, Serialize}; | ||
| use serde_json::Deserializer; | ||
| use std::pin::Pin; | ||
| use xmtp_proto::{Error, ErrorKind}; | ||
|
|
||
| #[derive(Deserialize, Serialize, Debug)] | ||
| pub(crate) struct SubscriptionItem<T> { | ||
| pub result: T, | ||
| } | ||
|
|
||
| enum HttpPostStream<F> | ||
| where | ||
| F: Future<Output = Result<Response, reqwest::Error>>, | ||
| { | ||
| NotStarted(F), | ||
| // NotStarted(Box<dyn Future<Output = Result<Response, Error>>>), | ||
| Started(Pin<Box<dyn Stream<Item = Result<bytes::Bytes, reqwest::Error>> + Unpin + Send>>), | ||
| } | ||
|
|
||
| impl<F> Stream for HttpPostStream<F> | ||
| where | ||
| F: Future<Output = Result<Response, reqwest::Error>> + Unpin, | ||
| { | ||
| type Item = Result<bytes::Bytes, reqwest::Error>; | ||
|
|
||
| fn poll_next( | ||
| mut self: std::pin::Pin<&mut Self>, | ||
| cx: &mut std::task::Context<'_>, | ||
| ) -> std::task::Poll<Option<Self::Item>> { | ||
| use futures::task::Poll::*; | ||
| use HttpPostStream::*; | ||
| match self.as_mut().get_mut() { | ||
| NotStarted(ref mut f) => { | ||
| tracing::info!("Polling"); | ||
| let f = std::pin::pin!(f); | ||
| match f.poll(cx) { | ||
| Ready(response) => { | ||
| let s = response.unwrap().bytes_stream(); | ||
| self.set(Self::Started(Box::pin(s.boxed()))); | ||
| self.poll_next(cx) | ||
| } | ||
| Pending => { | ||
| // cx.waker().wake_by_ref(); | ||
| Pending | ||
| } | ||
| } | ||
| } | ||
| Started(s) => s.poll_next_unpin(cx), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[cfg(target_arch = "wasm32")] | ||
| pub fn create_grpc_stream< | ||
| T: Serialize + Send + 'static, | ||
| R: DeserializeOwned + Send + std::fmt::Debug + 'static, | ||
| >( | ||
| request: T, | ||
| endpoint: String, | ||
| http_client: reqwest::Client, | ||
| ) -> stream::LocalBoxStream<'static, Result<R, Error>> { | ||
| create_grpc_stream_inner(request, endpoint, http_client).boxed_local() | ||
| } | ||
|
|
||
| #[cfg(not(target_arch = "wasm32"))] | ||
| pub fn create_grpc_stream< | ||
| T: Serialize + Send + 'static, | ||
| R: DeserializeOwned + Send + std::fmt::Debug + 'static, | ||
| >( | ||
| request: T, | ||
| endpoint: String, | ||
| http_client: reqwest::Client, | ||
| ) -> stream::BoxStream<'static, Result<R, Error>> { | ||
| create_grpc_stream_inner(request, endpoint, http_client).boxed() | ||
| } | ||
|
|
||
| pub fn create_grpc_stream_inner< | ||
| T: Serialize + Send + 'static, | ||
| R: DeserializeOwned + Send + std::fmt::Debug + 'static, | ||
| >( | ||
| request: T, | ||
| endpoint: String, | ||
| http_client: reqwest::Client, | ||
| ) -> impl Stream<Item = Result<R, Error>> { | ||
| let request = http_client.post(endpoint).json(&request).send(); | ||
| let http_stream = HttpPostStream::NotStarted(request); | ||
|
|
||
| async_stream::stream! { | ||
| tracing::info!("spawning grpc http stream"); | ||
| let mut remaining = vec![]; | ||
| for await bytes in http_stream { | ||
| let bytes = bytes | ||
| .map_err(|e| Error::new(ErrorKind::SubscriptionUpdateError).with(e.to_string()))?; | ||
| let bytes = &[remaining.as_ref(), bytes.as_ref()].concat(); | ||
| let de = Deserializer::from_slice(bytes); | ||
| let mut stream = de.into_iter::<GrpcResponse<R>>(); | ||
| 'messages: loop { | ||
| tracing::debug!("Waiting on next response ..."); | ||
| let response = stream.next(); | ||
| let res = match response { | ||
| Some(Ok(GrpcResponse::Ok(response))) => Ok(response), | ||
| Some(Ok(GrpcResponse::SubscriptionItem(item))) => Ok(item.result), | ||
| Some(Ok(GrpcResponse::Err(e))) => { | ||
| Err(Error::new(ErrorKind::MlsError).with(e.message)) | ||
| } | ||
| Some(Err(e)) => { | ||
| if e.is_eof() { | ||
| remaining = (&**bytes)[stream.byte_offset()..].to_vec(); | ||
| break 'messages; | ||
| } else { | ||
| Err(Error::new(ErrorKind::MlsError).with(e.to_string())) | ||
| } | ||
| } | ||
| Some(Ok(GrpcResponse::Empty {})) => continue 'messages, | ||
| None => break 'messages, | ||
| }; | ||
| yield res; | ||
| } | ||
| } | ||
| } | ||
| } |
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