mirror of
https://github.com/fluencelabs/rust-libp2p
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115 lines
3.8 KiB
Rust
115 lines
3.8 KiB
Rust
// Copyright 2020 Parity Technologies (UK) Ltd.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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use crate::{
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upgrade::{InboundUpgrade, OutboundUpgrade, ProtocolName, UpgradeInfo},
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Endpoint,
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};
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use futures::prelude::*;
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use std::iter;
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/// Initializes a new [`FromFnUpgrade`].
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///
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/// # Example
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///
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/// ```
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/// # use libp2p_core::transport::{Transport, MemoryTransport, memory::Channel};
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/// # use libp2p_core::{upgrade, Negotiated};
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/// # use std::io;
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/// # use futures::AsyncWriteExt;
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/// let _transport = MemoryTransport::default()
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/// .and_then(move |out, cp| {
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/// upgrade::apply(out, upgrade::from_fn("/foo/1", move |mut sock: Negotiated<Channel<Vec<u8>>>, endpoint| async move {
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/// if endpoint.is_dialer() {
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/// upgrade::write_length_prefixed(&mut sock, "some handshake data").await?;
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/// sock.close().await?;
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/// } else {
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/// let handshake_data = upgrade::read_length_prefixed(&mut sock, 1024).await?;
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/// if handshake_data != b"some handshake data" {
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/// return Err(io::Error::new(io::ErrorKind::Other, "bad handshake"));
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/// }
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/// }
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/// Ok(sock)
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/// }), cp, upgrade::Version::V1)
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/// });
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/// ```
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///
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pub fn from_fn<P, F, C, Fut, Out, Err>(protocol_name: P, fun: F) -> FromFnUpgrade<P, F>
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where
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// Note: these bounds are there in order to help the compiler infer types
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P: ProtocolName + Clone,
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F: FnOnce(C, Endpoint) -> Fut,
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Fut: Future<Output = Result<Out, Err>>,
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{
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FromFnUpgrade { protocol_name, fun }
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}
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/// Implements the `UpgradeInfo`, `InboundUpgrade` and `OutboundUpgrade` traits.
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///
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/// The upgrade consists in calling the function passed when creating this struct.
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#[derive(Debug, Clone)]
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pub struct FromFnUpgrade<P, F> {
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protocol_name: P,
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fun: F,
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}
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impl<P, F> UpgradeInfo for FromFnUpgrade<P, F>
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where
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P: ProtocolName + Clone,
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{
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type Info = P;
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type InfoIter = iter::Once<P>;
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fn protocol_info(&self) -> Self::InfoIter {
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iter::once(self.protocol_name.clone())
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}
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}
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impl<C, P, F, Fut, Err, Out> InboundUpgrade<C> for FromFnUpgrade<P, F>
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where
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P: ProtocolName + Clone,
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F: FnOnce(C, Endpoint) -> Fut,
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Fut: Future<Output = Result<Out, Err>>,
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{
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type Output = Out;
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type Error = Err;
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type Future = Fut;
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fn upgrade_inbound(self, sock: C, _: Self::Info) -> Self::Future {
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(self.fun)(sock, Endpoint::Listener)
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}
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}
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impl<C, P, F, Fut, Err, Out> OutboundUpgrade<C> for FromFnUpgrade<P, F>
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where
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P: ProtocolName + Clone,
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F: FnOnce(C, Endpoint) -> Fut,
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Fut: Future<Output = Result<Out, Err>>,
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{
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type Output = Out;
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type Error = Err;
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type Future = Fut;
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fn upgrade_outbound(self, sock: C, _: Self::Info) -> Self::Future {
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(self.fun)(sock, Endpoint::Dialer)
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}
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}
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