Polkadot service (#82)

* Block import notifications

* Build fix

* Consensus messages supported in the networking

* Started consensus service

* BFT service

* Transaction propagation

* Polkadot service

* CLI integration

* Build fix

* Added signatures validation

* Removed executor argument

* Refactored steam loops; Queue size increased

* Limit queue size

* Fixed doc comment

* Fixed wasm build

* Fixed wasm build

* Check id properly

substrate/polkadot/service/src/config.rs

@@ -0,0 +1,46 @@
+// Copyright 2017 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot 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.
+
+// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.?
+
+//! Service configuration.
+
+use transaction_pool;
+pub use network::Role;
+pub use network::NetworkConfiguration;
+
+/// Service configuration.
+pub struct Configuration {
+	/// Node roles.
+	pub roles: Role,
+	/// Transaction pool configuration.
+	pub transaction_pool: transaction_pool::Options,
+	/// Network configuration.
+	pub network: NetworkConfiguration,
+	/// Path to key files.
+	pub keystore_path: String,
+	// TODO: add more network, client, tx pool configuration options
+}
+
+impl Default for Configuration {
+	fn default() -> Configuration {
+		Configuration {
+			roles: Role::FULL,
+			transaction_pool: Default::default(),
+			network: Default::default(),
+			keystore_path: Default::default(),
+		}
+	}
+}
+