remove ClientProvider for feature PolkadotClient (#1052)

polkadot/service/src/client.rs

@@ -0,0 +1,52 @@
+// Copyright 2017-2020 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/>.
+
+//! Polkadot Client meta trait
+
+use sc_client_api::BlockchainEvents;
+use sp_api::{ProvideRuntimeApi, ConstructRuntimeApi, CallApiAt};
+use sp_runtime::traits::Block as BlockT;
+use sc_client_api::Backend as BackendT;
+
+/// Polkadot client abstraction, this super trait only pulls in functionality required for
+/// polkadot internal crates like polkadot-collator.
+pub trait PolkadotClient<Block, Backend, Runtime>:
+	BlockchainEvents<Block> + Sized + Send + Sync
+	+ ProvideRuntimeApi<Block, Api = Runtime::RuntimeApi>
+	+ CallApiAt<
+		Block,
+		Error = sp_blockchain::Error,
+		StateBackend = Backend ::State
+	>
+	where
+		Block: BlockT,
+		Backend: BackendT<Block>,
+		Runtime: ConstructRuntimeApi<Block, Self>
+{}
+
+impl<Block, Backend, Runtime, Client> PolkadotClient<Block, Backend, Runtime> for Client
+	where
+		Block: BlockT,
+		Runtime: ConstructRuntimeApi<Block, Self>,
+		Backend: BackendT<Block>,
+		Client: BlockchainEvents<Block> + ProvideRuntimeApi<Block, Api = Runtime::RuntimeApi>
+			+ Sized + Send + Sync
+			+ CallApiAt<
+				Block,
+				Error = sp_blockchain::Error,
+				StateBackend = Backend ::State
+			>
+{}