Propagate uncles (#1134)

ethcore/src/blockchain/blockchain.rs

@@ -518,6 +518,11 @@ impl BlockChain {
 
 	/// Given a block's `parent`, find every block header which represents a valid possible uncle.
 	pub fn find_uncle_headers(&self, parent: &H256, uncle_generations: usize) -> Option<Vec<Header>> {
+		self.find_uncle_hashes(parent, uncle_generations).map(|v| v.into_iter().filter_map(|h| self.block_header(&h)).collect())
+	}
+
+	/// Given a block's `parent`, find every block hash which represents a valid possible uncle.
+	pub fn find_uncle_hashes(&self, parent: &H256, uncle_generations: usize) -> Option<Vec<H256>> {
 		if !self.is_known(parent) { return None; }
 
 		let mut excluded = HashSet::new();
@@ -529,7 +534,7 @@ impl BlockChain {
 		let mut ret = Vec::new();
 		for a in self.ancestry_iter(parent.clone()).unwrap().skip(1).take(uncle_generations) {
 			ret.extend(self.block_details(&a).unwrap().children.iter()
-				.filter_map(|h| if excluded.contains(h) { None } else { self.block_header(h) })
+				.filter(|h| !excluded.contains(h))
 			);
 		}
 		Some(ret)

ethcore/src/client/client.rs

@@ -622,6 +622,10 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 		}
 	}
 
+	fn find_uncles(&self, hash: &H256) -> Option<Vec<H256>> {
+		self.chain.find_uncle_hashes(hash, self.engine.maximum_uncle_age())
+	}
+
 	fn state_data(&self, hash: &H256) -> Option<Bytes> {
 		self.state_db.lock().unwrap().state(hash)
 	}

ethcore/src/client/mod.rs

@@ -93,6 +93,9 @@ pub trait BlockChainClient : Sync + Send {
 	/// See `BlockChain::tree_route`.
 	fn tree_route(&self, from: &H256, to: &H256) -> Option<TreeRoute>;
 
+	/// Get all possible uncle hashes for a block.
+	fn find_uncles(&self, hash: &H256) -> Option<Vec<H256>>;
+
 	/// Get latest state node
 	fn state_data(&self, hash: &H256) -> Option<Bytes>;
 

ethcore/src/client/test_client.rs

@@ -348,6 +348,10 @@ impl BlockChainClient for TestBlockChainClient {
 		})
 	}
 
+	fn find_uncles(&self, _hash: &H256) -> Option<Vec<H256>> {
+		None
+	}
+
 	// TODO: returns just hashes instead of node state rlp(?)
 	fn state_data(&self, hash: &H256) -> Option<Bytes> {
 		// starts with 'f' ?

sync/src/chain.rs

@@ -252,7 +252,7 @@ impl ChainSync {
 		let chain = chain.chain_info();
 		let mut sync = ChainSync {
 			state: SyncState::ChainHead,
-			starting_block: 0,
+			starting_block: chain.best_block_number,
 			highest_block: None,
 			last_imported_block: chain.best_block_number,
 			last_imported_hash: chain.best_block_hash,
@@ -278,7 +278,7 @@ impl ChainSync {
 			network_id: self.network_id,
 			start_block_number: self.starting_block,
 			last_imported_block_number: Some(self.last_imported_block),
-			highest_block_number: self.highest_block,
+			highest_block_number: self.highest_block.map(|n| max(n, self.last_imported_block)),
 			blocks_received: if self.last_imported_block > self.starting_block { self.last_imported_block - self.starting_block } else { 0 },
 			blocks_total: match self.highest_block { Some(x) if x > self.starting_block => x - self.starting_block, _ => 0 },
 			num_peers: self.peers.len(),
@@ -1114,11 +1114,14 @@ impl ChainSync {
 	fn create_new_hashes_rlp(chain: &BlockChainClient, from: &H256, to: &H256) -> Option<Bytes> {
 		match chain.tree_route(from, to) {
 			Some(route) => {
+				let uncles = chain.find_uncles(from).unwrap_or_else(Vec::new);
 				match route.blocks.len() {
 					0 => None,
 					_ => {
-						let mut rlp_stream = RlpStream::new_list(route.blocks.len());
+						let mut blocks = route.blocks;
-						for block_hash in route.blocks {
+						blocks.extend(uncles);
+						let mut rlp_stream = RlpStream::new_list(blocks.len());
+						for block_hash in  blocks {
 							let mut hash_rlp = RlpStream::new_list(2);
 							let difficulty = chain.block_total_difficulty(BlockID::Hash(block_hash.clone())).expect("Malformed block without a difficulty on the chain!");
 							hash_rlp.append(&block_hash);