rust-libp2p/core/src/upgrade/plaintext.rs

// Copyright 2017 Parity Technologies (UK) Ltd.
//
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use bytes::Bytes;
use futures::future::{self, FutureResult};
use std::{iter, io::Error as IoError};
use tokio_io::{AsyncRead, AsyncWrite};
use upgrade::{ConnectionUpgrade, Endpoint};

/// Implementation of the `ConnectionUpgrade` that negotiates the `/plaintext/1.0.0` protocol and
/// simply passes communications through without doing anything more.
///
/// > **Note**: Generally used as an alternative to `secio` if a security layer is not desirable.
// TODO: move to a separate crate?
#[derive(Debug, Copy, Clone)]
pub struct PlainTextConfig;

impl<C, F> ConnectionUpgrade<C, F> for PlainTextConfig
where
    C: AsyncRead + AsyncWrite,
{
    type Output = C;
    type Future = FutureResult<(C, F), IoError>;
    type UpgradeIdentifier = ();
    type MultiaddrFuture = F;
    type NamesIter = iter::Once<(Bytes, ())>;

    #[inline]
    fn upgrade(self, i: C, _: (), _: Endpoint, remote_addr: F) -> Self::Future {
        future::ok((i, remote_addr))
    }

    #[inline]
    fn protocol_names(&self) -> Self::NamesIter {
        iter::once((Bytes::from("/plaintext/1.0.0"), ()))
    }
}