Interchain message-passing (#117)

* compute ingress and routing in polkadot runtime

* extract parent candidates from block when beginning consensus

* fetch incoming messages when validating

* fix consensus tests

* parachain wasm execution uses messages

* update parachain tests to check if messages are executed

* abstract out network service to make room for network tests

* skeleton for incoming data fetch

* collate ingress from consensus-gossip

* keep track of validated candidates in the shared-table

* add some shared_table tests for new behavior

* broadcast egress messages on gossip

* test compute_ingress

* move network tests to module folder

* dummy network for consensus-network tests

* make consensus network generic over executor

* test egress broadcast and ingress fetch

* fix test compilation

* address some grumbles

* address grumbles and fix parachain shuffle

* remove broadcast parameter from consensus network trait

polkadot/network/src/lib.rs

@@ -16,9 +16,8 @@
 
 //! Polkadot-specific network implementation.
 //!
-//! This manages gossip of consensus messages for BFT and for parachain statements,
-//! parachain block and extrinsic data fetching, communication between collators and validators,
-//! and more.
+//! This manages routing for parachain statements, parachain block and extrinsic data fetching,
+//! communication between collators and validators, and more.
 
 extern crate parity_codec as codec;
 extern crate substrate_network;
@@ -30,16 +29,23 @@ extern crate polkadot_availability_store as av_store;
 extern crate polkadot_primitives;
 
 extern crate arrayvec;
-extern crate futures;
 extern crate parking_lot;
 extern crate tokio;
-extern crate rhododendron;
+extern crate slice_group_by;
 
+#[macro_use]
+extern crate futures;
 #[macro_use]
 extern crate log;
 #[macro_use]
 extern crate parity_codec_derive;
 
+#[cfg(test)]
+extern crate substrate_client;
+
+#[cfg(test)]
+extern crate substrate_keyring;
+
 mod collator_pool;
 mod local_collations;
 mod router;
@@ -256,7 +262,7 @@ impl PolkadotProtocol {
 						send_polkadot_message(
 							ctx,
 							who,
-							Message::RequestBlockData(req_id, parent, c_hash)
+							Message::RequestBlockData(req_id, parent, c_hash),
 						);
 
 						in_flight.insert((req_id, who), pending);