Struct Host 

pub struct Host { /* private fields */ }

The T in Store<T> for what the CLI is running.

This structures has a number of contexts used for various WASI proposals. Note that all of them are optional meaning that they’re None by default and enabled with various CLI flags (some CLI flags are on-by-default). Note additionally that this structure is Clone to implement the wasi-threads proposal. Many WASI proposals are not compatible with wasi-threads so to model this Arc and Arc<Mutex<T>> is used for many configurations. If a WASI proposal is inherently threadsafe it’s protected with just an Arc to share its configuration across many threads.

If mutation is required then Mutex is used. Note though that the mutex is not actually locked as access always goes through Arc::get_mut which effectively asserts that there’s only one thread. In short much of this is not compatible with wasi-threads.

Trait Implementations

impl Clone for Host

fn clone(&self) -> Host

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for Host

fn default() -> Host

Returns the “default value” for a type.

impl WasiHttpView for Host

Available on crate feature wasi-http only.

fn ctx(&mut self) -> &mut WasiHttpCtx

Returns a mutable reference to the WASI HTTP context.

fn table(&mut self) -> &mut ResourceTable

Returns the table used to manage resources.

fn outgoing_body_buffer_chunks(&mut self) -> usize

Number of distinct write calls to the outgoing body’s output-stream that the implementation will buffer. Default: 1.

fn outgoing_body_chunk_size(&mut self) -> usize

Maximum size allowed in a write call to the outgoing body’s output-stream. Default: 1024 * 1024.

fn new_incoming_request<B>( &mut self, scheme: Scheme, req: Request<B>, ) -> Result<Resource<HostIncomingRequest>, Error>

where B: Body<Data = Bytes, Error = Error> + Send + Sync + 'static, Self: Sized,

Create a new incoming request resource.

fn new_response_outparam( &mut self, result: Sender<Result<Response<BoxBody<Bytes, ErrorCode>>, ErrorCode>>, ) -> Result<Resource<HostResponseOutparam>, Error>

Create a new outgoing response resource.

fn send_request( &mut self, request: Request<BoxBody<Bytes, ErrorCode>>, config: OutgoingRequestConfig, ) -> Result<HostFutureIncomingResponse, HttpError>

Send an outgoing request.

fn is_forbidden_header(&mut self, name: &HeaderName) -> bool

Whether a given header should be considered forbidden and not allowed.

impl WasiHttpView for Host

Available on crate features wasi-http and component-model-async only.

fn http(&mut self) -> WasiHttpCtxView<'_>

Return a WasiHttpCtxView from mutable reference to self.

impl WasiView for Host

fn ctx(&mut self) -> WasiCtxView<'_>

Yields mutable access to the WasiCtx configuration used for this context.