RPC & Client (#21)

* Initial version of http server.

* Refactor the structure.

* add unassigned ports info.

* Rename servers to match conventions.

* Add client crate and some proper RPC implementations.

* Style & docs.

substrate/rpc/src/state/tests.rs

@@ -0,0 +1,42 @@
+// 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/>.
+
+use super::*;
+use polkadot_contracts as contracts;
+
+use self::error::{Error, ErrorKind};
+use test_helpers::Blockchain;
+
+#[test]
+fn should_return_storage() {
+	let client = Client::new(Blockchain::default(), contracts::executor());
+
+	assert_matches!(
+		StateApi::storage(&client, 5.into(), 10.into(), 0.into()),
+		Ok(ref x) if x.0.is_empty()
+	)
+}
+
+#[test]
+fn should_call_contract() {
+	// TODO [ToDr] Fix test after we are able to mock state.
+	let client = Client::new(Blockchain::default(), contracts::executor());
+
+	assert_matches!(
+		StateApi::call(&client, 1.into(), "balanceOf".into(), CallData(vec![1,2,3]), 0.into()),
+		Err(Error(ErrorKind::Client(client::error::ErrorKind::Execution(_)), _))
+	)
+}