Crate fastsink

Create a Sink implementation from an initial value and a closure returning a Future.

This is very similar to how futures::stream::unfold creates a Stream implementation from a seed value and a future-returning closure.

Examples

use async_std::io;
use futures::prelude::*;
use fastsink::Action;

fastsink::make_sink(io::stdout(), |mut stdout, action| async move {
    match action {
        Action::Send(x) => stdout.write_all(x).await?,
        Action::Flush => stdout.flush().await?,
        Action::Close => stdout.close().await?
    }
    Ok::<_, io::Error>(stdout)
});

Panics

• If any of the Sink methods produce an error, the sink transitions to a failure state and none of its methods must be called afterwards or else a panic will occur.
• If Sink::poll_close has been called, no other sink method must be called afterwards or else a panic will be caused.

Structs

SinkImpl

SinkImpl implements the Sink trait.

Enums

Action

The command given to the closure so that it can perform appropriate action.

Functions

make_sink

Returns a Sink impl based on the initial value and the given closure.