skeleton and request traits

ethcore/src/light/client.rs

@@ -68,6 +68,11 @@ impl Client {
 	pub fn queue_info(&self) -> QueueInfo {
 		self.header_queue.queue_info()
 	}
+
+	/// Get the chain info.
+	pub fn chain_info(&self) -> ChainInfo {
+
+	}
 }
 
 impl Provider for Client {

ethcore/src/light/sync.rs

@@ -0,0 +1,33 @@
+// Copyright 2015, 2016 Ethcore (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/>.
+
+//! A light sync target.
+
+use block_import_error::BlockImportError;
+use client::BlockChainInfo;
+
+use util::hash::H256;
+
+pub trait Sync {
+	/// Whether syncing is enabled.
+	fn enabled(&self) -> bool;
+
+	/// Current chain info.
+	fn chain_info(&self) -> BlockChainInfo;
+
+	/// Import a header.
+	fn import_header(&self, header_bytes: Vec<u8>) ->  Result<H256, BlockImportError>;
+}