wasmtime_wasi_http/
types.rs

1//! Implements the base structure (i.e. [WasiHttpCtx]) that will provide the
2//! implementation of the wasi-http API.
3
4use crate::io::TokioIo;
5use crate::{
6    bindings::http::types::{self, Method, Scheme},
7    body::{HostIncomingBody, HyperIncomingBody, HyperOutgoingBody},
8    error::dns_error,
9    hyper_request_error,
10};
11use anyhow::bail;
12use bytes::Bytes;
13use http_body_util::BodyExt;
14use hyper::body::Body;
15use hyper::header::HeaderName;
16use std::any::Any;
17use std::time::Duration;
18use tokio::net::TcpStream;
19use tokio::time::timeout;
20use wasmtime::component::{Resource, ResourceTable};
21use wasmtime_wasi::p2::{IoImpl, IoView, Pollable};
22use wasmtime_wasi::runtime::AbortOnDropJoinHandle;
23
24/// Capture the state necessary for use in the wasi-http API implementation.
25#[derive(Debug)]
26pub struct WasiHttpCtx {
27    _priv: (),
28}
29
30impl WasiHttpCtx {
31    /// Create a new context.
32    pub fn new() -> Self {
33        Self { _priv: () }
34    }
35}
36
37/// A trait which provides internal WASI HTTP state.
38///
39/// # Example
40///
41/// ```
42/// use wasmtime::component::ResourceTable;
43/// use wasmtime_wasi::p2::{IoView, WasiCtx, WasiView, WasiCtxBuilder};
44/// use wasmtime_wasi_http::{WasiHttpCtx, WasiHttpView};
45///
46/// struct MyState {
47///     ctx: WasiCtx,
48///     http_ctx: WasiHttpCtx,
49///     table: ResourceTable,
50/// }
51///
52/// impl IoView for MyState {
53///     fn table(&mut self) -> &mut ResourceTable { &mut self.table }
54/// }
55/// impl WasiHttpView for MyState {
56///     fn ctx(&mut self) -> &mut WasiHttpCtx { &mut self.http_ctx }
57/// }
58///
59/// impl WasiView for MyState {
60///     fn ctx(&mut self) -> &mut WasiCtx { &mut self.ctx }
61/// }
62///
63/// impl MyState {
64///     fn new() -> MyState {
65///         let mut wasi = WasiCtxBuilder::new();
66///         wasi.arg("./foo.wasm");
67///         wasi.arg("--help");
68///         wasi.env("FOO", "bar");
69///
70///         MyState {
71///             ctx: wasi.build(),
72///             table: ResourceTable::new(),
73///             http_ctx: WasiHttpCtx::new(),
74///         }
75///     }
76/// }
77/// ```
78pub trait WasiHttpView: IoView {
79    /// Returns a mutable reference to the WASI HTTP context.
80    fn ctx(&mut self) -> &mut WasiHttpCtx;
81
82    /// Create a new incoming request resource.
83    fn new_incoming_request<B>(
84        &mut self,
85        scheme: Scheme,
86        req: hyper::Request<B>,
87    ) -> wasmtime::Result<Resource<HostIncomingRequest>>
88    where
89        B: Body<Data = Bytes, Error = hyper::Error> + Send + Sync + 'static,
90        Self: Sized,
91    {
92        let (parts, body) = req.into_parts();
93        let body = body.map_err(crate::hyper_response_error).boxed();
94        let body = HostIncomingBody::new(
95            body,
96            // TODO: this needs to be plumbed through
97            std::time::Duration::from_millis(600 * 1000),
98        );
99        let incoming_req = HostIncomingRequest::new(self, parts, scheme, Some(body))?;
100        Ok(self.table().push(incoming_req)?)
101    }
102
103    /// Create a new outgoing response resource.
104    fn new_response_outparam(
105        &mut self,
106        result: tokio::sync::oneshot::Sender<
107            Result<hyper::Response<HyperOutgoingBody>, types::ErrorCode>,
108        >,
109    ) -> wasmtime::Result<Resource<HostResponseOutparam>> {
110        let id = self.table().push(HostResponseOutparam { result })?;
111        Ok(id)
112    }
113
114    /// Send an outgoing request.
115    fn send_request(
116        &mut self,
117        request: hyper::Request<HyperOutgoingBody>,
118        config: OutgoingRequestConfig,
119    ) -> crate::HttpResult<HostFutureIncomingResponse> {
120        Ok(default_send_request(request, config))
121    }
122
123    /// Whether a given header should be considered forbidden and not allowed.
124    fn is_forbidden_header(&mut self, _name: &HeaderName) -> bool {
125        false
126    }
127
128    /// Number of distinct write calls to the outgoing body's output-stream
129    /// that the implementation will buffer.
130    /// Default: 1.
131    fn outgoing_body_buffer_chunks(&mut self) -> usize {
132        DEFAULT_OUTGOING_BODY_BUFFER_CHUNKS
133    }
134
135    /// Maximum size allowed in a write call to the outgoing body's output-stream.
136    /// Default: 1024 * 1024.
137    fn outgoing_body_chunk_size(&mut self) -> usize {
138        DEFAULT_OUTGOING_BODY_CHUNK_SIZE
139    }
140}
141
142/// The default value configured for [`WasiHttpView::outgoing_body_buffer_chunks`] in [`WasiHttpView`].
143pub const DEFAULT_OUTGOING_BODY_BUFFER_CHUNKS: usize = 1;
144/// The default value configured for [`WasiHttpView::outgoing_body_chunk_size`] in [`WasiHttpView`].
145pub const DEFAULT_OUTGOING_BODY_CHUNK_SIZE: usize = 1024 * 1024;
146
147impl<T: ?Sized + WasiHttpView> WasiHttpView for &mut T {
148    fn ctx(&mut self) -> &mut WasiHttpCtx {
149        T::ctx(self)
150    }
151
152    fn new_response_outparam(
153        &mut self,
154        result: tokio::sync::oneshot::Sender<
155            Result<hyper::Response<HyperOutgoingBody>, types::ErrorCode>,
156        >,
157    ) -> wasmtime::Result<Resource<HostResponseOutparam>> {
158        T::new_response_outparam(self, result)
159    }
160
161    fn send_request(
162        &mut self,
163        request: hyper::Request<HyperOutgoingBody>,
164        config: OutgoingRequestConfig,
165    ) -> crate::HttpResult<HostFutureIncomingResponse> {
166        T::send_request(self, request, config)
167    }
168
169    fn is_forbidden_header(&mut self, name: &HeaderName) -> bool {
170        T::is_forbidden_header(self, name)
171    }
172
173    fn outgoing_body_buffer_chunks(&mut self) -> usize {
174        T::outgoing_body_buffer_chunks(self)
175    }
176
177    fn outgoing_body_chunk_size(&mut self) -> usize {
178        T::outgoing_body_chunk_size(self)
179    }
180}
181
182impl<T: ?Sized + WasiHttpView> WasiHttpView for Box<T> {
183    fn ctx(&mut self) -> &mut WasiHttpCtx {
184        T::ctx(self)
185    }
186
187    fn new_response_outparam(
188        &mut self,
189        result: tokio::sync::oneshot::Sender<
190            Result<hyper::Response<HyperOutgoingBody>, types::ErrorCode>,
191        >,
192    ) -> wasmtime::Result<Resource<HostResponseOutparam>> {
193        T::new_response_outparam(self, result)
194    }
195
196    fn send_request(
197        &mut self,
198        request: hyper::Request<HyperOutgoingBody>,
199        config: OutgoingRequestConfig,
200    ) -> crate::HttpResult<HostFutureIncomingResponse> {
201        T::send_request(self, request, config)
202    }
203
204    fn is_forbidden_header(&mut self, name: &HeaderName) -> bool {
205        T::is_forbidden_header(self, name)
206    }
207
208    fn outgoing_body_buffer_chunks(&mut self) -> usize {
209        T::outgoing_body_buffer_chunks(self)
210    }
211
212    fn outgoing_body_chunk_size(&mut self) -> usize {
213        T::outgoing_body_chunk_size(self)
214    }
215}
216
217/// A concrete structure that all generated `Host` traits are implemented for.
218///
219/// This type serves as a small newtype wrapper to implement all of the `Host`
220/// traits for `wasi:http`. This type is internally used and is only needed if
221/// you're interacting with `add_to_linker` functions generated by bindings
222/// themselves (or `add_to_linker_get_host`).
223///
224/// This type is automatically used when using
225/// [`add_to_linker_async`](crate::add_to_linker_async)
226/// or
227/// [`add_to_linker_sync`](crate::add_to_linker_sync)
228/// and doesn't need to be manually configured.
229#[repr(transparent)]
230pub struct WasiHttpImpl<T>(pub IoImpl<T>);
231
232impl<T: IoView> IoView for WasiHttpImpl<T> {
233    fn table(&mut self) -> &mut ResourceTable {
234        T::table(&mut self.0.0)
235    }
236}
237impl<T: WasiHttpView> WasiHttpView for WasiHttpImpl<T> {
238    fn ctx(&mut self) -> &mut WasiHttpCtx {
239        self.0.0.ctx()
240    }
241
242    fn new_response_outparam(
243        &mut self,
244        result: tokio::sync::oneshot::Sender<
245            Result<hyper::Response<HyperOutgoingBody>, types::ErrorCode>,
246        >,
247    ) -> wasmtime::Result<Resource<HostResponseOutparam>> {
248        self.0.0.new_response_outparam(result)
249    }
250
251    fn send_request(
252        &mut self,
253        request: hyper::Request<HyperOutgoingBody>,
254        config: OutgoingRequestConfig,
255    ) -> crate::HttpResult<HostFutureIncomingResponse> {
256        self.0.0.send_request(request, config)
257    }
258
259    fn is_forbidden_header(&mut self, name: &HeaderName) -> bool {
260        self.0.0.is_forbidden_header(name)
261    }
262
263    fn outgoing_body_buffer_chunks(&mut self) -> usize {
264        self.0.0.outgoing_body_buffer_chunks()
265    }
266
267    fn outgoing_body_chunk_size(&mut self) -> usize {
268        self.0.0.outgoing_body_chunk_size()
269    }
270}
271
272/// Returns `true` when the header is forbidden according to this [`WasiHttpView`] implementation.
273pub(crate) fn is_forbidden_header(view: &mut dyn WasiHttpView, name: &HeaderName) -> bool {
274    static FORBIDDEN_HEADERS: [HeaderName; 9] = [
275        hyper::header::CONNECTION,
276        HeaderName::from_static("keep-alive"),
277        hyper::header::PROXY_AUTHENTICATE,
278        hyper::header::PROXY_AUTHORIZATION,
279        HeaderName::from_static("proxy-connection"),
280        hyper::header::TRANSFER_ENCODING,
281        hyper::header::UPGRADE,
282        hyper::header::HOST,
283        HeaderName::from_static("http2-settings"),
284    ];
285
286    FORBIDDEN_HEADERS.contains(name) || view.is_forbidden_header(name)
287}
288
289/// Removes forbidden headers from a [`hyper::HeaderMap`].
290pub(crate) fn remove_forbidden_headers(
291    view: &mut dyn WasiHttpView,
292    headers: &mut hyper::HeaderMap,
293) {
294    let forbidden_keys = Vec::from_iter(headers.keys().filter_map(|name| {
295        if is_forbidden_header(view, name) {
296            Some(name.clone())
297        } else {
298            None
299        }
300    }));
301
302    for name in forbidden_keys {
303        headers.remove(name);
304    }
305}
306
307/// Configuration for an outgoing request.
308pub struct OutgoingRequestConfig {
309    /// Whether to use TLS for the request.
310    pub use_tls: bool,
311    /// The timeout for connecting.
312    pub connect_timeout: Duration,
313    /// The timeout until the first byte.
314    pub first_byte_timeout: Duration,
315    /// The timeout between chunks of a streaming body
316    pub between_bytes_timeout: Duration,
317}
318
319/// The default implementation of how an outgoing request is sent.
320///
321/// This implementation is used by the `wasi:http/outgoing-handler` interface
322/// default implementation.
323pub fn default_send_request(
324    request: hyper::Request<HyperOutgoingBody>,
325    config: OutgoingRequestConfig,
326) -> HostFutureIncomingResponse {
327    let handle = wasmtime_wasi::runtime::spawn(async move {
328        Ok(default_send_request_handler(request, config).await)
329    });
330    HostFutureIncomingResponse::pending(handle)
331}
332
333/// The underlying implementation of how an outgoing request is sent. This should likely be spawned
334/// in a task.
335///
336/// This is called from [default_send_request] to actually send the request.
337pub async fn default_send_request_handler(
338    mut request: hyper::Request<HyperOutgoingBody>,
339    OutgoingRequestConfig {
340        use_tls,
341        connect_timeout,
342        first_byte_timeout,
343        between_bytes_timeout,
344    }: OutgoingRequestConfig,
345) -> Result<IncomingResponse, types::ErrorCode> {
346    let authority = if let Some(authority) = request.uri().authority() {
347        if authority.port().is_some() {
348            authority.to_string()
349        } else {
350            let port = if use_tls { 443 } else { 80 };
351            format!("{}:{port}", authority.to_string())
352        }
353    } else {
354        return Err(types::ErrorCode::HttpRequestUriInvalid);
355    };
356    let tcp_stream = timeout(connect_timeout, TcpStream::connect(&authority))
357        .await
358        .map_err(|_| types::ErrorCode::ConnectionTimeout)?
359        .map_err(|e| match e.kind() {
360            std::io::ErrorKind::AddrNotAvailable => {
361                dns_error("address not available".to_string(), 0)
362            }
363
364            _ => {
365                if e.to_string()
366                    .starts_with("failed to lookup address information")
367                {
368                    dns_error("address not available".to_string(), 0)
369                } else {
370                    types::ErrorCode::ConnectionRefused
371                }
372            }
373        })?;
374
375    let (mut sender, worker) = if use_tls {
376        use rustls::pki_types::ServerName;
377
378        // derived from https://github.com/rustls/rustls/blob/main/examples/src/bin/simpleclient.rs
379        let root_cert_store = rustls::RootCertStore {
380            roots: webpki_roots::TLS_SERVER_ROOTS.into(),
381        };
382        let config = rustls::ClientConfig::builder()
383            .with_root_certificates(root_cert_store)
384            .with_no_client_auth();
385        let connector = tokio_rustls::TlsConnector::from(std::sync::Arc::new(config));
386        let mut parts = authority.split(":");
387        let host = parts.next().unwrap_or(&authority);
388        let domain = ServerName::try_from(host)
389            .map_err(|e| {
390                tracing::warn!("dns lookup error: {e:?}");
391                dns_error("invalid dns name".to_string(), 0)
392            })?
393            .to_owned();
394        let stream = connector.connect(domain, tcp_stream).await.map_err(|e| {
395            tracing::warn!("tls protocol error: {e:?}");
396            types::ErrorCode::TlsProtocolError
397        })?;
398        let stream = TokioIo::new(stream);
399
400        let (sender, conn) = timeout(
401            connect_timeout,
402            hyper::client::conn::http1::handshake(stream),
403        )
404        .await
405        .map_err(|_| types::ErrorCode::ConnectionTimeout)?
406        .map_err(hyper_request_error)?;
407
408        let worker = wasmtime_wasi::runtime::spawn(async move {
409            match conn.await {
410                Ok(()) => {}
411                // TODO: shouldn't throw away this error and ideally should
412                // surface somewhere.
413                Err(e) => tracing::warn!("dropping error {e}"),
414            }
415        });
416
417        (sender, worker)
418    } else {
419        let tcp_stream = TokioIo::new(tcp_stream);
420        let (sender, conn) = timeout(
421            connect_timeout,
422            // TODO: we should plumb the builder through the http context, and use it here
423            hyper::client::conn::http1::handshake(tcp_stream),
424        )
425        .await
426        .map_err(|_| types::ErrorCode::ConnectionTimeout)?
427        .map_err(hyper_request_error)?;
428
429        let worker = wasmtime_wasi::runtime::spawn(async move {
430            match conn.await {
431                Ok(()) => {}
432                // TODO: same as above, shouldn't throw this error away.
433                Err(e) => tracing::warn!("dropping error {e}"),
434            }
435        });
436
437        (sender, worker)
438    };
439
440    // at this point, the request contains the scheme and the authority, but
441    // the http packet should only include those if addressing a proxy, so
442    // remove them here, since SendRequest::send_request does not do it for us
443    *request.uri_mut() = http::Uri::builder()
444        .path_and_query(
445            request
446                .uri()
447                .path_and_query()
448                .map(|p| p.as_str())
449                .unwrap_or("/"),
450        )
451        .build()
452        .expect("comes from valid request");
453
454    let resp = timeout(first_byte_timeout, sender.send_request(request))
455        .await
456        .map_err(|_| types::ErrorCode::ConnectionReadTimeout)?
457        .map_err(hyper_request_error)?
458        .map(|body| body.map_err(hyper_request_error).boxed());
459
460    Ok(IncomingResponse {
461        resp,
462        worker: Some(worker),
463        between_bytes_timeout,
464    })
465}
466
467impl From<http::Method> for types::Method {
468    fn from(method: http::Method) -> Self {
469        if method == http::Method::GET {
470            types::Method::Get
471        } else if method == hyper::Method::HEAD {
472            types::Method::Head
473        } else if method == hyper::Method::POST {
474            types::Method::Post
475        } else if method == hyper::Method::PUT {
476            types::Method::Put
477        } else if method == hyper::Method::DELETE {
478            types::Method::Delete
479        } else if method == hyper::Method::CONNECT {
480            types::Method::Connect
481        } else if method == hyper::Method::OPTIONS {
482            types::Method::Options
483        } else if method == hyper::Method::TRACE {
484            types::Method::Trace
485        } else if method == hyper::Method::PATCH {
486            types::Method::Patch
487        } else {
488            types::Method::Other(method.to_string())
489        }
490    }
491}
492
493impl TryInto<http::Method> for types::Method {
494    type Error = http::method::InvalidMethod;
495
496    fn try_into(self) -> Result<http::Method, Self::Error> {
497        match self {
498            Method::Get => Ok(http::Method::GET),
499            Method::Head => Ok(http::Method::HEAD),
500            Method::Post => Ok(http::Method::POST),
501            Method::Put => Ok(http::Method::PUT),
502            Method::Delete => Ok(http::Method::DELETE),
503            Method::Connect => Ok(http::Method::CONNECT),
504            Method::Options => Ok(http::Method::OPTIONS),
505            Method::Trace => Ok(http::Method::TRACE),
506            Method::Patch => Ok(http::Method::PATCH),
507            Method::Other(s) => http::Method::from_bytes(s.as_bytes()),
508        }
509    }
510}
511
512/// The concrete type behind a `wasi:http/types/incoming-request` resource.
513#[derive(Debug)]
514pub struct HostIncomingRequest {
515    pub(crate) parts: http::request::Parts,
516    pub(crate) scheme: Scheme,
517    pub(crate) authority: String,
518    /// The body of the incoming request.
519    pub body: Option<HostIncomingBody>,
520}
521
522impl HostIncomingRequest {
523    /// Create a new `HostIncomingRequest`.
524    pub fn new(
525        view: &mut dyn WasiHttpView,
526        mut parts: http::request::Parts,
527        scheme: Scheme,
528        body: Option<HostIncomingBody>,
529    ) -> anyhow::Result<Self> {
530        let authority = match parts.uri.authority() {
531            Some(authority) => authority.to_string(),
532            None => match parts.headers.get(http::header::HOST) {
533                Some(host) => host.to_str()?.to_string(),
534                None => bail!("invalid HTTP request missing authority in URI and host header"),
535            },
536        };
537
538        remove_forbidden_headers(view, &mut parts.headers);
539        Ok(Self {
540            parts,
541            authority,
542            scheme,
543            body,
544        })
545    }
546}
547
548/// The concrete type behind a `wasi:http/types/response-outparam` resource.
549pub struct HostResponseOutparam {
550    /// The sender for sending a response.
551    pub result:
552        tokio::sync::oneshot::Sender<Result<hyper::Response<HyperOutgoingBody>, types::ErrorCode>>,
553}
554
555/// The concrete type behind a `wasi:http/types/outgoing-response` resource.
556pub struct HostOutgoingResponse {
557    /// The status of the response.
558    pub status: http::StatusCode,
559    /// The headers of the response.
560    pub headers: FieldMap,
561    /// The body of the response.
562    pub body: Option<HyperOutgoingBody>,
563}
564
565impl TryFrom<HostOutgoingResponse> for hyper::Response<HyperOutgoingBody> {
566    type Error = http::Error;
567
568    fn try_from(
569        resp: HostOutgoingResponse,
570    ) -> Result<hyper::Response<HyperOutgoingBody>, Self::Error> {
571        use http_body_util::Empty;
572
573        let mut builder = hyper::Response::builder().status(resp.status);
574
575        *builder.headers_mut().unwrap() = resp.headers;
576
577        match resp.body {
578            Some(body) => builder.body(body),
579            None => builder.body(
580                Empty::<bytes::Bytes>::new()
581                    .map_err(|_| unreachable!("Infallible error"))
582                    .boxed(),
583            ),
584        }
585    }
586}
587
588/// The concrete type behind a `wasi:http/types/outgoing-request` resource.
589#[derive(Debug)]
590pub struct HostOutgoingRequest {
591    /// The method of the request.
592    pub method: Method,
593    /// The scheme of the request.
594    pub scheme: Option<Scheme>,
595    /// The authority of the request.
596    pub authority: Option<String>,
597    /// The path and query of the request.
598    pub path_with_query: Option<String>,
599    /// The request headers.
600    pub headers: FieldMap,
601    /// The request body.
602    pub body: Option<HyperOutgoingBody>,
603}
604
605/// The concrete type behind a `wasi:http/types/request-options` resource.
606#[derive(Debug, Default)]
607pub struct HostRequestOptions {
608    /// How long to wait for a connection to be established.
609    pub connect_timeout: Option<std::time::Duration>,
610    /// How long to wait for the first byte of the response body.
611    pub first_byte_timeout: Option<std::time::Duration>,
612    /// How long to wait between frames of the response body.
613    pub between_bytes_timeout: Option<std::time::Duration>,
614}
615
616/// The concrete type behind a `wasi:http/types/incoming-response` resource.
617#[derive(Debug)]
618pub struct HostIncomingResponse {
619    /// The response status
620    pub status: u16,
621    /// The response headers
622    pub headers: FieldMap,
623    /// The response body
624    pub body: Option<HostIncomingBody>,
625}
626
627/// The concrete type behind a `wasi:http/types/fields` resource.
628#[derive(Debug)]
629pub enum HostFields {
630    /// A reference to the fields of a parent entry.
631    Ref {
632        /// The parent resource rep.
633        parent: u32,
634
635        /// The function to get the fields from the parent.
636        // NOTE: there's not failure in the result here because we assume that HostFields will
637        // always be registered as a child of the entry with the `parent` id. This ensures that the
638        // entry will always exist while this `HostFields::Ref` entry exists in the table, thus we
639        // don't need to account for failure when fetching the fields ref from the parent.
640        get_fields: for<'a> fn(elem: &'a mut (dyn Any + 'static)) -> &'a mut FieldMap,
641    },
642    /// An owned version of the fields.
643    Owned {
644        /// The fields themselves.
645        fields: FieldMap,
646    },
647}
648
649/// An owned version of `HostFields`
650pub type FieldMap = hyper::HeaderMap;
651
652/// A handle to a future incoming response.
653pub type FutureIncomingResponseHandle =
654    AbortOnDropJoinHandle<anyhow::Result<Result<IncomingResponse, types::ErrorCode>>>;
655
656/// A response that is in the process of being received.
657#[derive(Debug)]
658pub struct IncomingResponse {
659    /// The response itself.
660    pub resp: hyper::Response<HyperIncomingBody>,
661    /// Optional worker task that continues to process the response.
662    pub worker: Option<AbortOnDropJoinHandle<()>>,
663    /// The timeout between chunks of the response.
664    pub between_bytes_timeout: std::time::Duration,
665}
666
667/// The concrete type behind a `wasi:http/types/future-incoming-response` resource.
668#[derive(Debug)]
669pub enum HostFutureIncomingResponse {
670    /// A pending response
671    Pending(FutureIncomingResponseHandle),
672    /// The response is ready.
673    ///
674    /// An outer error will trap while the inner error gets returned to the guest.
675    Ready(anyhow::Result<Result<IncomingResponse, types::ErrorCode>>),
676    /// The response has been consumed.
677    Consumed,
678}
679
680impl HostFutureIncomingResponse {
681    /// Create a new `HostFutureIncomingResponse` that is pending on the provided task handle.
682    pub fn pending(handle: FutureIncomingResponseHandle) -> Self {
683        Self::Pending(handle)
684    }
685
686    /// Create a new `HostFutureIncomingResponse` that is ready.
687    pub fn ready(result: anyhow::Result<Result<IncomingResponse, types::ErrorCode>>) -> Self {
688        Self::Ready(result)
689    }
690
691    /// Returns `true` if the response is ready.
692    pub fn is_ready(&self) -> bool {
693        matches!(self, Self::Ready(_))
694    }
695
696    /// Unwrap the response, panicking if it is not ready.
697    pub fn unwrap_ready(self) -> anyhow::Result<Result<IncomingResponse, types::ErrorCode>> {
698        match self {
699            Self::Ready(res) => res,
700            Self::Pending(_) | Self::Consumed => {
701                panic!("unwrap_ready called on a pending HostFutureIncomingResponse")
702            }
703        }
704    }
705}
706
707#[async_trait::async_trait]
708impl Pollable for HostFutureIncomingResponse {
709    async fn ready(&mut self) {
710        if let Self::Pending(handle) = self {
711            *self = Self::Ready(handle.await);
712        }
713    }
714}
wasmtime_wasi_http/types.rs

wasmtime_wasi_http/
types.rs
