diff options
Diffstat (limited to 'examples/input/evented_stdin.rs')
-rw-r--r-- | examples/input/evented_stdin.rs | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/examples/input/evented_stdin.rs b/examples/input/evented_stdin.rs new file mode 100644 index 0000000..107c394 --- /dev/null +++ b/examples/input/evented_stdin.rs @@ -0,0 +1,88 @@ +// this is a hack around the fact that tokio::io::stdin() is actually +// blocking, which makes it useless for interactive programs. this isn't great +// (or particularly correct) but it mostly works. + +use std::io::Read as _; + +struct EventedStdin; + +const STDIN: i32 = 0; + +impl std::io::Read for EventedStdin { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> { + let stdin = std::io::stdin(); + let mut stdin = stdin.lock(); + stdin.read(buf) + } +} + +impl mio::Evented for EventedStdin { + fn register( + &self, + poll: &mio::Poll, + token: mio::Token, + interest: mio::Ready, + opts: mio::PollOpt, + ) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.register(poll, token, interest, opts) + } + + fn reregister( + &self, + poll: &mio::Poll, + token: mio::Token, + interest: mio::Ready, + opts: mio::PollOpt, + ) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.reregister(poll, token, interest, opts) + } + + fn deregister(&self, poll: &mio::Poll) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.deregister(poll) + } +} + +pub struct Stdin { + input: tokio::reactor::PollEvented2<EventedStdin>, +} + +#[allow(dead_code)] +impl Stdin { + pub fn new() -> Self { + Default::default() + } +} + +impl Default for Stdin { + fn default() -> Self { + Self { + input: tokio::reactor::PollEvented2::new(EventedStdin), + } + } +} + +impl std::io::Read for Stdin { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> { + self.input.read(buf) + } +} + +impl tokio::io::AsyncRead for Stdin { + fn poll_read( + &mut self, + buf: &mut [u8], + ) -> std::result::Result<futures::Async<usize>, tokio::io::Error> { + let ready = mio::Ready::readable(); + futures::try_ready!(self.input.poll_read_ready(ready)); + + let res = self.read(buf)?; + self.input.clear_read_ready(ready)?; + Ok(futures::Async::Ready(res)) + } +} |