From 8d7244c09fe2c796b62f62863fab6627bca964df Mon Sep 17 00:00:00 2001
From: Robert Habermeier <rphmeier@gmail.com>
Date: Wed, 5 Oct 2016 15:35:31 +0200
Subject: [PATCH] light client sync stubs

---
 ethcore/src/light/client.rs | 40 ++++++++-----------------------------
 ethcore/src/light/mod.rs    |  1 +
 sync/src/lib.rs             |  1 +
 sync/src/light/mod.rs       | 27 +++++++++++++++++++++++++
 sync/src/sync_io.rs         |  4 ++--
 5 files changed, 39 insertions(+), 34 deletions(-)
 create mode 100644 sync/src/light/mod.rs

diff --git a/ethcore/src/light/client.rs b/ethcore/src/light/client.rs
index de79ad922..18635aa44 100644
--- a/ethcore/src/light/client.rs
+++ b/ethcore/src/light/client.rs
@@ -39,57 +39,33 @@ pub struct Client {
 	engine: Arc<Engine>,
 	header_queue: HeaderQueue,
 	message_channel: IoChannel<ClientIoMessage>,
-	transaction_queue: TransactionQueue,
 }
 
 impl Client {
 	/// Import a header as rlp-encoded bytes.
-	fn import_header(&self, bytes: Bytes) -> Result<H256, BlockImportError> {
+	pub fn import_header(&self, bytes: Bytes) -> Result<H256, BlockImportError> {
 		let header = ::rlp::decode(&bytes);
 
 		self.header_queue.import(header).map_err(Into::into)
 	}
 
 	/// Whether the block is already known (but not necessarily part of the canonical chain)
-	fn is_known(&self, id: BlockID) -> bool {
+	pub fn is_known(&self, id: BlockID) -> bool {
 		false
 	}
 
 	/// Fetch a vector of all pending transactions.
-	fn pending_transactions(&self) -> Vec<SignedTransaction> {
-		self.transaction_queue.top_transactions()
+	pub fn pending_transactions(&self) -> Vec<SignedTransaction> {
+		vec![]
 	}
 
 	/// Inquire about the status of a given block.
-	fn status(&self, id: BlockID) -> BlockStatus {
+	pub fn status(&self, id: BlockID) -> BlockStatus {
 		BlockStatus::Unknown
 	}
-}
 
-// stub implementation, can be partially implemented using LRU-caches
-// but will almost definitely never be able to provide complete responses.
-impl Provider for Client {
-	fn block_headers(&self, _block: H256, _skip: usize, _max: usize, _reverse: bool) -> Vec<Bytes> {
-		vec![]
-	}
-
-	fn block_bodies(&self, _blocks: Vec<H256>) -> Vec<Bytes> {
-		vec![]
-	}
-
-	fn receipts(&self, _blocks: Vec<H256>) -> Vec<Bytes> {
-		vec![]
-	}
-
-	fn proofs(&self, _requests: Vec<(H256, ProofRequest)>) -> Vec<Bytes> {
-		vec![]
-	}
-
-	fn code(&self, _accounts: Vec<(H256, H256)>) -> Vec<Bytes> {
-		vec![]
-	}
-
-	fn header_proofs(&self, _requests: Vec<CHTProofRequest>) -> Vec<Bytes> {
-		vec![]
+	/// Get the header queue info.
+	pub fn queue_info(&self) -> QueueInfo {
+		self.header_queue.queue_info()
 	}
 }
\ No newline at end of file
diff --git a/ethcore/src/light/mod.rs b/ethcore/src/light/mod.rs
index 32d4e9d8a..22b446074 100644
--- a/ethcore/src/light/mod.rs
+++ b/ethcore/src/light/mod.rs
@@ -15,4 +15,5 @@
 mod provider;
 mod client;
 
+pub use self::client::Client;
 pub use self::provider::{CHTProofRequest, ProofRequest, Provider};
diff --git a/sync/src/lib.rs b/sync/src/lib.rs
index d2c6e2583..e13e3b8b1 100644
--- a/sync/src/lib.rs
+++ b/sync/src/lib.rs
@@ -50,6 +50,7 @@ mod chain;
 mod blocks;
 mod sync_io;
 mod snapshot;
+mod light;
 
 #[cfg(test)]
 mod tests;
diff --git a/sync/src/light/mod.rs b/sync/src/light/mod.rs
new file mode 100644
index 000000000..13ba38c5a
--- /dev/null
+++ b/sync/src/light/mod.rs
@@ -0,0 +1,27 @@
+// 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/>.
+
+//! LES Protocol Version 1 implementation.
+//!
+//! This uses a "Provider" to answer requests.
+
+use ethcore::light::{Client, Provider};
+
+/// This handles synchronization of the header chain for a light client.
+pub struct Chain {
+	client: Client,
+	peers: Vec<Peer>,
+}
\ No newline at end of file
diff --git a/sync/src/sync_io.rs b/sync/src/sync_io.rs
index 445939399..867a75f38 100644
--- a/sync/src/sync_io.rs
+++ b/sync/src/sync_io.rs
@@ -18,7 +18,7 @@ use network::{NetworkContext, PeerId, PacketId, NetworkError};
 use ethcore::client::BlockChainClient;
 use ethcore::snapshot::SnapshotService;
 
-/// IO interface for the syning handler.
+/// IO interface for the syncing handler.
 /// Provides peer connection management and an interface to the blockchain client.
 // TODO: ratings
 pub trait SyncIo {
@@ -38,7 +38,7 @@ pub trait SyncIo {
 	fn peer_info(&self, peer_id: PeerId) -> String {
 		peer_id.to_string()
 	}
-	/// Maximum mutuallt supported ETH protocol version
+	/// Maximum mutually supported ETH protocol version
 	fn eth_protocol_version(&self, peer_id: PeerId) -> u8;
 	/// Returns if the chain block queue empty
 	fn is_chain_queue_empty(&self) -> bool {