test framework and basic test for whisper

whisper/src/net/mod.rs

@@ -30,6 +30,9 @@ use rlp::{DecoderError, RlpStream, UntrustedRlp};
 
 use message::{Message, Error as MessageError};
 
+#[cfg(test)]
+mod tests;
+
 // how often periodic relays are. when messages are imported
 // we directly broadcast.
 const RALLY_TOKEN: TimerToken = 1;
@@ -341,8 +344,8 @@ impl Peer {
 			.map_or(true, |filter| &(filter & message.bloom()) == message.bloom())
 	}
 
-	// note a message as known. returns true if it was already
-	// known, false otherwise.
+	// note a message as known. returns false if it was already
+	// known, true otherwise.
 	fn note_known(&mut self, message: &Message) -> bool {
 		self.known_messages.insert(message.hash().clone())
 	}
@@ -657,6 +660,22 @@ impl<T: MessageHandler> Network<T> {
 		io.send(*peer, packet::STATUS, ::rlp::EMPTY_LIST_RLP.to_vec());
 	}
 
+	fn on_packet<C: Context>(&self, io: &C, peer: &PeerId, packet_id: u8, data: &[u8]) {
+		let rlp = UntrustedRlp::new(data);
+		let res = match packet_id {
+			packet::STATUS => self.on_status(peer, rlp),
+			packet::MESSAGES => self.on_messages(peer, rlp),
+			packet::POW_REQUIREMENT => self.on_pow_requirement(peer, rlp),
+			packet::TOPIC_FILTER => self.on_topic_filter(peer, rlp),
+			_ => Ok(()), // ignore unknown packets.
+		};
+
+		if let Err(e) = res {
+			trace!(target: "whisper", "Disabling peer due to misbehavior: {}", e);
+			io.disable_peer(*peer);
+		}
+	}
+
 	fn on_disconnect(&self, peer: &PeerId) {
 		trace!(target: "whisper", "Disconnecting peer {}", peer);
 		let _ = self.peers.write().remove(peer);
@@ -673,19 +692,7 @@ impl<T: MessageHandler> ::network::NetworkProtocolHandler for Network<T> {
 	}
 
 	fn read(&self, io: &NetworkContext, peer: &PeerId, packet_id: u8, data: &[u8]) {
-		let rlp = UntrustedRlp::new(data);
-		let res = match packet_id {
-			packet::STATUS => self.on_status(peer, rlp),
-			packet::MESSAGES => self.on_messages(peer, rlp),
-			packet::POW_REQUIREMENT => self.on_pow_requirement(peer, rlp),
-			packet::TOPIC_FILTER => self.on_topic_filter(peer, rlp),
-			_ => Ok(()), // ignore unknown packets.
-		};
-
-		if let Err(e) = res {
-			trace!(target: "whisper", "Disabling peer due to misbehavior: {}", e);
-			io.disable_peer(*peer);
-		}
+		self.on_packet(io, peer, packet_id, data)
 	}
 
 	fn connected(&self, io: &NetworkContext, peer: &PeerId) {

whisper/src/net/tests.rs

@@ -0,0 +1,192 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tests for the whisper network module.
+
+use std::collections::HashSet;
+use std::sync::mpsc;
+
+use parking_lot::Mutex;
+use network::{NodeId, PeerId};
+
+use message::{CreateParams, Message};
+use super::*;
+
+struct TestHandler(Mutex<mpsc::Sender<Message>>);
+
+impl MessageHandler for TestHandler {
+	fn handle_messages(&self, messages: &[Message]) {
+		let tx = self.0.lock();
+		for message in messages {
+			let _ = tx.send(message.clone());
+		}
+	}
+}
+
+struct TestPeer {
+	network: Network<TestHandler>,
+	recv: mpsc::Receiver<Message>,
+	disconnected: Mutex<HashSet<PeerId>>,
+}
+
+impl TestPeer {
+	fn create() -> Self {
+		let (tx, rx) = mpsc::channel();
+
+		TestPeer {
+			network: Network::new(10 * 1024 * 1024, TestHandler(Mutex::new(tx))),
+			recv: rx,
+			disconnected: Mutex::new(HashSet::new()),
+		}
+	}
+}
+
+struct TestNetwork {
+	peers: Vec<TestPeer>,
+}
+
+impl TestNetwork {
+	fn new(n_peers: usize) -> Self {
+		let unconnected_peers: Vec<_> = (0..n_peers).map(|_| TestPeer::create()).collect();
+		for i in 0..n_peers {
+			for j in (i + 1)..n_peers {
+				let (peer1, peer2) = (&unconnected_peers[i], &unconnected_peers[j]);
+				let ctx1 = TestContext::new(&unconnected_peers, i);
+				let ctx2 = TestContext::new(&unconnected_peers, j);
+
+				peer1.network.on_connect(&ctx1, &j);
+				peer2.network.on_connect(&ctx2, &i);
+			}
+		}
+
+		TestNetwork {
+			peers: unconnected_peers,
+		}
+	}
+
+	fn post_message_from(&self, id: PeerId, msg: Message) {
+		self.peers[id].network.post_message(msg, &TestContext::new(&self.peers, id));
+	}
+}
+
+enum Event {
+	Disconnect(PeerId, PeerId),
+	Send(PeerId, PeerId, u8, Vec<u8>),
+}
+
+struct TestContext<'a> {
+	peers: &'a [TestPeer],
+	local_id: PeerId,
+	events: Mutex<Vec<Event>>,
+}
+
+impl<'a> TestContext<'a> {
+	fn new(peers: &'a [TestPeer], local_id: PeerId) -> Self {
+		TestContext {
+			peers,
+			local_id,
+			events: Mutex::new(Vec::new()),
+		}
+	}
+}
+
+impl<'a> Context for TestContext<'a> {
+	fn disconnect_peer(&self, id: PeerId) {
+		self.events.lock().push(Event::Disconnect(self.local_id, id));
+	}
+
+	fn disable_peer(&self, id: PeerId) {
+		self.events.lock().push(Event::Disconnect(self.local_id, id));
+	}
+
+	fn node_key(&self, peer: PeerId) -> Option<NodeId> {
+		let mut id = NodeId::default();
+		id[0] = peer as _;
+		Some(id)
+	}
+
+	fn protocol_version(&self, id: ::network::ProtocolId, _peer: PeerId) -> Option<u8> {
+		if &id == b"shh" || &id == b"pwh" {
+			Some(PROTOCOL_VERSION as _)
+		} else {
+			None
+		}
+	}
+
+	fn send(&self, peer: PeerId, packet: u8, data: Vec<u8>) {
+		self.events.lock().push(Event::Send(self.local_id, peer, packet, data));
+	}
+}
+
+impl<'a> Drop for TestContext<'a> {
+	fn drop(&mut self) {
+		let events = self.events.get_mut();
+		while !events.is_empty() {
+			let mut deferred = Vec::new();
+			for event in events.drain(..) {
+				match event {
+					Event::Disconnect(from, target) => {
+						self.peers[from].network.on_disconnect(&target);
+						self.peers[target].network.on_disconnect(&from);
+
+						self.peers[from].disconnected.lock().insert(target);
+						self.peers[target].disconnected.lock().insert(from);
+					}
+					Event::Send(from, target, packet, data) => {
+						if self.peers[from].disconnected.lock().contains(&target) {
+							continue;
+						}
+
+						let mut inner_ctx = TestContext::new(self.peers, target);
+
+						self.peers[target].network.on_packet(
+							&inner_ctx,
+							&from,
+							packet,
+							&data[..]
+						);
+
+						// don't recursively apply disconnects or new messages
+						// from the receiver's actions yet.
+						let inner_events = ::std::mem::replace(inner_ctx.events.get_mut(), Vec::new());
+						deferred.extend(inner_events);
+					}
+				}
+			}
+
+			events.extend(deferred);
+		}
+	}
+}
+
+#[test]
+fn message_gets_relayed() {
+	let network = TestNetwork::new(5);
+	let message = Message::create(CreateParams {
+		ttl: 500,
+		payload: b"this is my payload, pal".to_vec(),
+		topics: vec![[0, 1, 2, 3].into()],
+		work: 25,
+	}).unwrap();
+
+	network.post_message_from(0, message.clone());
+
+	assert!(network.peers[0].recv.try_recv().is_err());
+
+	for i in 1..5 {
+		assert_eq!(network.peers[i].recv.try_recv().unwrap(), message);
+	}
+}