wasmtime_wasi_http/p2/
http_impl.rs

1//! Implementation of the `wasi:http/outgoing-handler` interface.
2
3use crate::WasiHttpCtxView;
4use crate::p2::{
5    HttpResult,
6    bindings::http::{
7        outgoing_handler,
8        types::{self, Scheme},
9    },
10    error::internal_error,
11    http_request_error,
12    types::{HostFutureIncomingResponse, HostOutgoingRequest},
13};
14use bytes::Bytes;
15use http_body_util::{BodyExt, Empty};
16use hyper::Method;
17use std::pin::Pin;
18use wasmtime::component::Resource;
19
20impl outgoing_handler::Host for WasiHttpCtxView<'_> {
21    fn handle(
22        &mut self,
23        request_id: Resource<HostOutgoingRequest>,
24        options: Option<Resource<types::RequestOptions>>,
25    ) -> HttpResult<Resource<HostFutureIncomingResponse>> {
26        let opts = options.and_then(|opts| self.table.get(&opts).ok()).cloned();
27
28        let req = self.table.delete(request_id)?;
29        let mut builder = hyper::Request::builder();
30
31        builder = builder.method(match req.method {
32            types::Method::Get => Method::GET,
33            types::Method::Head => Method::HEAD,
34            types::Method::Post => Method::POST,
35            types::Method::Put => Method::PUT,
36            types::Method::Delete => Method::DELETE,
37            types::Method::Connect => Method::CONNECT,
38            types::Method::Options => Method::OPTIONS,
39            types::Method::Trace => Method::TRACE,
40            types::Method::Patch => Method::PATCH,
41            types::Method::Other(m) => match hyper::Method::from_bytes(m.as_bytes()) {
42                Ok(method) => method,
43                Err(_) => return Err(types::ErrorCode::HttpRequestMethodInvalid.into()),
44            },
45        });
46
47        let scheme = match req.scheme.unwrap_or(Scheme::Https) {
48            Scheme::Http => http::uri::Scheme::HTTP,
49            Scheme::Https => http::uri::Scheme::HTTPS,
50
51            // We can only support http/https
52            Scheme::Other(_) => return Err(types::ErrorCode::HttpProtocolError.into()),
53        };
54
55        let authority = req.authority.unwrap_or_else(String::new);
56
57        let mut uri = http::Uri::builder()
58            .scheme(scheme)
59            .authority(authority.clone());
60
61        if let Some(path) = req.path_with_query {
62            uri = uri.path_and_query(path);
63        }
64
65        builder = builder.uri(uri.build().map_err(http_request_error)?);
66
67        for (k, v) in req.headers.iter() {
68            builder = builder.header(k, v);
69        }
70
71        let body = req.body.unwrap_or_else(|| {
72            Empty::<Bytes>::new()
73                .map_err(|_| unreachable!("Infallible error"))
74                .boxed_unsync()
75        });
76        let body = body.map_err(Into::into).boxed_unsync();
77
78        let request = builder
79            .body(body)
80            .map_err(|err| internal_error(err.to_string()))?;
81
82        let future = self
83            .hooks
84            .send_request(request, opts, Box::new(async { Ok(()) }));
85        let future = wasmtime_wasi::runtime::spawn(async move {
86            let (res, io) = Pin::from(future).await?;
87            let io = wasmtime_wasi::runtime::spawn(async move {
88                match Pin::from(io).await {
89                    Ok(()) => {}
90                    // TODO: shouldn't throw away this error and ideally should
91                    // surface somewhere.
92                    Err(e) => tracing::warn!("dropping error {e}"),
93                }
94            });
95            let res = res.map(|b| b.boxed_unsync());
96            Ok((res, io))
97        });
98
99        Ok(self
100            .table
101            .push(HostFutureIncomingResponse::Pending(future))?)
102    }
103}
wasmtime_wasi_http/p2/http_impl.rs

wasmtime_wasi_http/p2/
http_impl.rs
