Add an IdentifyTopology (#770)

protocols/identify/src/topology.rs

@@ -0,0 +1,40 @@
+// 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 libp2p_core::{topology::MemoryTopology, Multiaddr, PeerId};
+
+/// Trait required on the topology for the identify system to store addresses.
+pub trait IdentifyTopology {
+    /// Adds to the topology an address discovered through identification.
+    fn add_identify_discovered_addrs<TIter>(&mut self, peer: &PeerId, addr: TIter)
+    where
+        TIter: Iterator<Item = Multiaddr>;
+}
+
+impl IdentifyTopology for MemoryTopology {
+    fn add_identify_discovered_addrs<TIter>(&mut self, peer: &PeerId, addr: TIter)
+    where
+        TIter: Iterator<Item = Multiaddr>,
+    {
+        for addr in addr {
+            self.add_address(peer.clone(), addr);
+        }
+    }
+}