Move swarm and protocols handler into swarm crate. (#1188)

Move swarm and protocols handler into swarm crate.

swarm/src/protocols_handler/dummy.rs

@@ -0,0 +1,98 @@
+// Copyright 2018 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::protocols_handler::{
+    KeepAlive,
+    SubstreamProtocol,
+    ProtocolsHandler,
+    ProtocolsHandlerEvent,
+    ProtocolsHandlerUpgrErr
+};
+use futures::prelude::*;
+use libp2p_core::upgrade::{InboundUpgrade, OutboundUpgrade, DeniedUpgrade};
+use std::marker::PhantomData;
+use tokio_io::{AsyncRead, AsyncWrite};
+use void::Void;
+
+/// Implementation of `ProtocolsHandler` that doesn't handle anything.
+pub struct DummyProtocolsHandler<TSubstream> {
+    marker: PhantomData<TSubstream>,
+}
+
+impl<TSubstream> Default for DummyProtocolsHandler<TSubstream> {
+    #[inline]
+    fn default() -> Self {
+        DummyProtocolsHandler {
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<TSubstream> ProtocolsHandler for DummyProtocolsHandler<TSubstream>
+where
+    TSubstream: AsyncRead + AsyncWrite,
+{
+    type InEvent = Void;
+    type OutEvent = Void;
+    type Error = Void;
+    type Substream = TSubstream;
+    type InboundProtocol = DeniedUpgrade;
+    type OutboundProtocol = DeniedUpgrade;
+    type OutboundOpenInfo = Void;
+
+    #[inline]
+    fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol> {
+        SubstreamProtocol::new(DeniedUpgrade)
+    }
+
+    #[inline]
+    fn inject_fully_negotiated_inbound(
+        &mut self,
+        _: <Self::InboundProtocol as InboundUpgrade<TSubstream>>::Output
+    ) {
+    }
+
+    #[inline]
+    fn inject_fully_negotiated_outbound(
+        &mut self,
+        _: <Self::OutboundProtocol as OutboundUpgrade<TSubstream>>::Output,
+        _: Self::OutboundOpenInfo
+    ) {
+    }
+
+    #[inline]
+    fn inject_event(&mut self, _: Self::InEvent) {}
+
+    #[inline]
+    fn inject_dial_upgrade_error(&mut self, _: Self::OutboundOpenInfo, _: ProtocolsHandlerUpgrErr<<Self::OutboundProtocol as OutboundUpgrade<Self::Substream>>::Error>) {}
+
+    #[inline]
+    fn connection_keep_alive(&self) -> KeepAlive { KeepAlive::No }
+
+    #[inline]
+    fn poll(
+        &mut self,
+    ) -> Poll<
+        ProtocolsHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::OutEvent>,
+        Void,
+    > {
+        Ok(Async::NotReady)
+    }
+}