61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
//! A streaming Cargo response. Dropping the body cancels the builder's native process group.
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use crate::builder::Event;
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use bytes::Bytes;
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use http::{Request, Response};
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use http_body_util::BodyExt;
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use std::{
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pin::Pin,
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task::{Context, Poll},
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};
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struct Body(tokio::sync::mpsc::Receiver<Event>);
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impl http_body::Body for Body {
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type Data = Bytes;
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type Error = wasmtime_wasi_http::Error;
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fn poll_frame(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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) -> Poll<Option<Result<http_body::Frame<Bytes>, Self::Error>>> {
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self.0.poll_recv(cx).map(|event| {
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event.map(|event| {
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let mut bytes = serde_json::to_vec(&event).expect("Cargo event");
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bytes.push(b'\n');
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Ok(http_body::Frame::data(Bytes::from(bytes)))
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})
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})
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}
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}
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pub(crate) fn stream(
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api: &super::Api,
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request: Request<Bytes>,
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) -> Response<wasmtime_wasi_http::WasiBody> {
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let (tx, rx) = tokio::sync::mpsc::channel(16);
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let builder = api.builder.get().cloned();
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let request = serde_json::from_slice::<crate::builder::Request>(request.body());
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tokio::spawn(async move {
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let result = async {
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builder
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.ok_or_else(|| anyhow::anyhow!("builder unavailable"))?
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.execute(request?, &tx)
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.await
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}
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.await;
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if let Err(error) = result {
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let _ = tx
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.send(Event::Stderr {
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bytes: format!("cargo: {error:#}\n").into_bytes(),
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})
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.await;
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let _ = tx
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.send(Event::Exit {
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code: 1,
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executables: Vec::new(),
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})
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.await;
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}
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});
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Response::builder()
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.header("content-type", "application/x-ndjson")
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.body(Body(rx).boxed_unsync())
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.unwrap()
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}
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