Struct wasi_common::pipe::ReadPipe

source · 
pub struct ReadPipe<R: Read> { /* private fields */ }
Expand description

A virtual pipe read end.

A variety of From impls are provided so that common pipe types are easy to create. For example:

use wasi_common::{pipe::ReadPipe, WasiCtx, Table};
let stdin = ReadPipe::from("hello from stdin!");
// Brint these instances from elsewhere (e.g. wasi-cap-std-sync):
let random = todo!();
let clocks = todo!();
let sched = todo!();
let table = Table::new();
let mut ctx = WasiCtx::new(random, clocks, sched, table);
ctx.set_stdin(Box::new(stdin.clone()));

Implementations§

Create a new pipe from a Read type.

All Handle read operations delegate to reading from this underlying reader.

Examples found in repository?
src/pipe.rs (line 81)
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    fn from(r: Vec<u8>) -> Self {
        Self::new(io::Cursor::new(r))
    }
}

impl From<&[u8]> for ReadPipe<io::Cursor<Vec<u8>>> {
    fn from(r: &[u8]) -> Self {
        Self::from(r.to_vec())
    }
}

impl From<String> for ReadPipe<io::Cursor<String>> {
    fn from(r: String) -> Self {
        Self::new(io::Cursor::new(r))
    }
More examples
Hide additional examples
src/ctx.rs (line 35)
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    pub fn new(
        random: Box<dyn RngCore + Send + Sync>,
        clocks: WasiClocks,
        sched: Box<dyn WasiSched>,
        table: Table,
    ) -> Self {
        let mut s = WasiCtx {
            args: StringArray::new(),
            env: StringArray::new(),
            random,
            clocks,
            sched,
            table,
        };
        s.set_stdin(Box::new(crate::pipe::ReadPipe::new(std::io::empty())));
        s.set_stdout(Box::new(crate::pipe::WritePipe::new(std::io::sink())));
        s.set_stderr(Box::new(crate::pipe::WritePipe::new(std::io::sink())));
        s
    }

Create a new pipe from a shareable Read type.

All Handle read operations delegate to reading from this underlying reader.

Examples found in repository?
src/pipe.rs (line 52)
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    pub fn new(r: R) -> Self {
        Self::from_shared(Arc::new(RwLock::new(r)))
    }

Try to convert this ReadPipe<R> back to the underlying R type.

This will fail with Err(self) if multiple references to the underlying R exist.

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.
Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more