Struct AsyncStdoutStream

pub struct AsyncStdoutStream(/* private fields */);

A wrapper of crate::pipe::AsyncWriteStream that implements StdoutStream. Note that the HostOutputStream impl for this is not correct when used for interleaved async IO.

Implementations

impl AsyncStdoutStream

pub fn new(s: AsyncWriteStream) -> Self

Trait Implementations

impl HostOutputStream for AsyncStdoutStream

fn check_write(&mut self) -> Result<usize, StreamError>

Returns the number of bytes that are ready to be written to this stream.

fn write(&mut self, bytes: Bytes) -> Result<(), StreamError>

Write bytes after obtaining a permit to write those bytes

fn flush(&mut self) -> Result<(), StreamError>

Trigger a flush of any bytes buffered in this stream implementation.

fn cancel<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Cancel any asynchronous work and wait for it to wrap up.

fn blocking_write_and_flush<'life0, 'async_trait>( &'life0 mut self, bytes: Bytes, ) -> Pin<Box<dyn Future<Output = StreamResult<()>> + Send + 'async_trait>>

where Self: Send + 'async_trait, 'life0: 'async_trait,

Perform a write of up to 4096 bytes, and then flush the stream. Block until all of these operations are complete, or an error occurs.

fn write_zeroes(&mut self, nelem: usize) -> StreamResult<()>

Repeatedly write a byte to a stream. Important: this write must be non-blocking! Returning an Err which downcasts to a StreamError will be reported to Wasm as the empty error result. Otherwise, errors will trap.

fn blocking_write_zeroes_and_flush<'life0, 'async_trait>( &'life0 mut self, nelem: usize, ) -> Pin<Box<dyn Future<Output = StreamResult<()>> + Send + 'async_trait>>

where Self: Send + 'async_trait, 'life0: 'async_trait,

Perform a write of up to 4096 zeroes, and then flush the stream. Block until all of these operations are complete, or an error occurs.

fn write_ready<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = StreamResult<usize>> + Send + 'async_trait>>

where Self: Send + 'async_trait, 'life0: 'async_trait,

Simultaneously waits for this stream to be writable and then returns how much may be written or the last error that happened.

impl StdoutStream for AsyncStdoutStream

fn stream(&self) -> Box<dyn HostOutputStream>

Returns a fresh new stream which can write to this output stream.

fn isatty(&self) -> bool

Returns whether this stream is backed by a TTY.

impl Subscribe for AsyncStdoutStream

fn ready<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

An asynchronous function which resolves when this object’s readiness operation is ready.