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dummy.rs
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dummy.rs
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// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
use crate::transport::{ListenerId, Transport, TransportError, TransportEvent};
use crate::Multiaddr;
use futures::{prelude::*, task::Context, task::Poll};
use std::{fmt, io, marker::PhantomData, pin::Pin};
/// Implementation of `Transport` that doesn't support any multiaddr.
///
/// Useful for testing purposes, or as a fallback implementation when no protocol is available.
pub struct DummyTransport<TOut = DummyStream>(PhantomData<TOut>);
impl<TOut> DummyTransport<TOut> {
/// Builds a new `DummyTransport`.
pub fn new() -> Self {
DummyTransport(PhantomData)
}
}
impl<TOut> Default for DummyTransport<TOut> {
fn default() -> Self {
DummyTransport::new()
}
}
impl<TOut> fmt::Debug for DummyTransport<TOut> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "DummyTransport")
}
}
impl<TOut> Clone for DummyTransport<TOut> {
fn clone(&self) -> Self {
DummyTransport(PhantomData)
}
}
impl<TOut> Transport for DummyTransport<TOut> {
type Output = TOut;
type Error = io::Error;
type ListenerUpgrade = futures::future::Pending<Result<Self::Output, io::Error>>;
type Dial = futures::future::Pending<Result<Self::Output, io::Error>>;
fn listen_on(&mut self, addr: Multiaddr) -> Result<ListenerId, TransportError<Self::Error>> {
Err(TransportError::MultiaddrNotSupported(addr))
}
fn remove_listener(&mut self, _id: ListenerId) -> bool {
false
}
fn dial(&mut self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
Err(TransportError::MultiaddrNotSupported(addr))
}
fn dial_as_listener(
&mut self,
addr: Multiaddr,
) -> Result<Self::Dial, TransportError<Self::Error>> {
Err(TransportError::MultiaddrNotSupported(addr))
}
fn poll(
self: Pin<&mut Self>,
_: &mut Context<'_>,
) -> Poll<TransportEvent<Self::ListenerUpgrade, Self::Error>> {
Poll::Pending
}
}
/// Implementation of `AsyncRead` and `AsyncWrite`. Not meant to be instanciated.
pub struct DummyStream(());
impl fmt::Debug for DummyStream {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "DummyStream")
}
}
impl AsyncRead for DummyStream {
fn poll_read(
self: Pin<&mut Self>,
_: &mut Context<'_>,
_: &mut [u8],
) -> Poll<Result<usize, io::Error>> {
Poll::Ready(Err(io::ErrorKind::Other.into()))
}
}
impl AsyncWrite for DummyStream {
fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
_: &[u8],
) -> Poll<Result<usize, io::Error>> {
Poll::Ready(Err(io::ErrorKind::Other.into()))
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
Poll::Ready(Err(io::ErrorKind::Other.into()))
}
fn poll_close(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
Poll::Ready(Err(io::ErrorKind::Other.into()))
}
}