Sync headers slice (#2085)

* pass slices of headers around, not vec of headers

* rustfmt

chain/src/chain.rs

@@ -335,11 +335,7 @@ impl Chain {
 	/// Attempt to add new headers to the header chain (or fork).
 	/// This is only ever used during sync and is based on sync_head.
 	/// We update header_head here if our total work increases.
-	pub fn sync_block_headers(
-		&self,
-		headers: &Vec<BlockHeader>,
-		opts: Options,
-	) -> Result<(), Error> {
+	pub fn sync_block_headers(&self, headers: &[BlockHeader], opts: Options) -> Result<(), Error> {
 		let mut txhashset = self.txhashset.write();
 		let batch = self.store.batch()?;
 		let mut ctx = self.new_ctx(opts, batch, &mut txhashset)?;

chain/src/pipe.rs

@@ -182,7 +182,7 @@ pub fn process_block(b: &Block, ctx: &mut BlockContext) -> Result<Option<Tip>, E
 /// Process the block header.
 /// This is only ever used during sync and uses a context based on sync_head.
 pub fn sync_block_headers(
-	headers: &Vec<BlockHeader>,
+	headers: &[BlockHeader],
 	ctx: &mut BlockContext,
 ) -> Result<Option<Tip>, Error> {
 	if let Some(header) = headers.first() {

p2p/src/peer.rs

@@ -546,11 +546,11 @@ impl ChainAdapter for TrackingAdapter {
 		self.adapter.header_received(bh, addr)
 	}
 
-	fn headers_received(&self, bh: Vec<core::BlockHeader>, addr: SocketAddr) -> bool {
+	fn headers_received(&self, bh: &[core::BlockHeader], addr: SocketAddr) -> bool {
 		self.adapter.headers_received(bh, addr)
 	}
 
-	fn locate_headers(&self, locator: Vec<Hash>) -> Vec<core::BlockHeader> {
+	fn locate_headers(&self, locator: &[Hash]) -> Vec<core::BlockHeader> {
 		self.adapter.locate_headers(locator)
 	}
 

p2p/src/peers.rs

@@ -532,7 +532,7 @@ impl ChainAdapter for Peers {
 		}
 	}
 
-	fn headers_received(&self, headers: Vec<core::BlockHeader>, peer_addr: SocketAddr) -> bool {
+	fn headers_received(&self, headers: &[core::BlockHeader], peer_addr: SocketAddr) -> bool {
 		if !self.adapter.headers_received(headers, peer_addr) {
 			// if the peer sent us a block header that's intrinsically bad
 			// they are either mistaken or malevolent, both of which require a ban
@@ -543,7 +543,7 @@ impl ChainAdapter for Peers {
 		}
 	}
 
-	fn locate_headers(&self, hs: Vec<Hash>) -> Vec<core::BlockHeader> {
+	fn locate_headers(&self, hs: &[Hash]) -> Vec<core::BlockHeader> {
 		self.adapter.locate_headers(hs)
 	}
 

p2p/src/protocol.rs

@@ -182,7 +182,7 @@ impl MessageHandler for Protocol {
 			Type::GetHeaders => {
 				// load headers from the locator
 				let loc: Locator = msg.body()?;
-				let headers = adapter.locate_headers(loc.hashes);
+				let headers = adapter.locate_headers(&loc.hashes);
 
 				// serialize and send all the headers over
 				Ok(Some(Response::new(
@@ -216,7 +216,7 @@ impl MessageHandler for Protocol {
 						headers.push(header);
 						total_bytes_read += bytes_read;
 					}
-					adapter.headers_received(headers, self.addr);
+					adapter.headers_received(&headers, self.addr);
 				}
 
 				// Now check we read the correct total number of bytes off the stream.

p2p/src/serv.rs

@@ -231,10 +231,10 @@ impl ChainAdapter for DummyAdapter {
 	fn block_received(&self, _: core::Block, _: SocketAddr) -> bool {
 		true
 	}
-	fn headers_received(&self, _: Vec<core::BlockHeader>, _: SocketAddr) -> bool {
+	fn headers_received(&self, _: &[core::BlockHeader], _: SocketAddr) -> bool {
 		true
 	}
-	fn locate_headers(&self, _: Vec<Hash>) -> Vec<core::BlockHeader> {
+	fn locate_headers(&self, _: &[Hash]) -> Vec<core::BlockHeader> {
 		vec![]
 	}
 	fn get_block(&self, _: Hash) -> Option<core::Block> {

p2p/src/types.rs

@@ -359,12 +359,12 @@ pub trait ChainAdapter: Sync + Send {
 	/// A set of block header has been received, typically in response to a
 	/// block
 	/// header request.
-	fn headers_received(&self, bh: Vec<core::BlockHeader>, addr: SocketAddr) -> bool;
+	fn headers_received(&self, bh: &[core::BlockHeader], addr: SocketAddr) -> bool;
 
 	/// Finds a list of block headers based on the provided locator. Tries to
 	/// identify the common chain and gets the headers that follow it
 	/// immediately.
-	fn locate_headers(&self, locator: Vec<Hash>) -> Vec<core::BlockHeader>;
+	fn locate_headers(&self, locator: &[Hash]) -> Vec<core::BlockHeader>;
 
 	/// Gets a full block by its hash.
 	fn get_block(&self, h: Hash) -> Option<core::Block>;

servers/src/common/adapters.rs

@@ -231,7 +231,7 @@ impl p2p::ChainAdapter for NetToChainAdapter {
 		true
 	}
 
-	fn headers_received(&self, bhs: Vec<core::BlockHeader>, addr: SocketAddr) -> bool {
+	fn headers_received(&self, bhs: &[core::BlockHeader], addr: SocketAddr) -> bool {
 		info!(
 			"Received block headers {:?} from {}",
 			bhs.iter().map(|x| x.hash()).collect::<Vec<_>>(),
@@ -243,7 +243,7 @@ impl p2p::ChainAdapter for NetToChainAdapter {
 		}
 
 		// try to add headers to our header chain
-		let res = self.chain().sync_block_headers(&bhs, self.chain_opts());
+		let res = self.chain().sync_block_headers(bhs, self.chain_opts());
 		if let &Err(ref e) = &res {
 			debug!("Block headers refused by chain: {:?}", e);
 
@@ -254,7 +254,7 @@ impl p2p::ChainAdapter for NetToChainAdapter {
 		true
 	}
 
-	fn locate_headers(&self, locator: Vec<Hash>) -> Vec<core::BlockHeader> {
+	fn locate_headers(&self, locator: &[Hash]) -> Vec<core::BlockHeader> {
 		debug!("locator: {:?}", locator);
 
 		let header = match self.find_common_header(locator) {
@@ -402,7 +402,7 @@ impl NetToChainAdapter {
 	}
 
 	// Find the first locator hash that refers to a known header on our main chain.
-	fn find_common_header(&self, locator: Vec<Hash>) -> Option<BlockHeader> {
+	fn find_common_header(&self, locator: &[Hash]) -> Option<BlockHeader> {
 		for hash in locator {
 			if let Ok(header) = self.chain().get_block_header(&hash) {
 				if let Ok(header_at_height) = self.chain().get_header_by_height(header.height) {