cluster layout: adapt all uses of ClusterLayout to LayoutHistory

src/table/replication/fullcopy.rs

@@ -27,11 +27,10 @@ impl TableReplication for TableFullReplication {
 	}
 
 	fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
-		let layout = self.system.cluster_layout();
-		layout.node_ids().to_vec()
+		self.system.cluster_layout().current().node_ids().to_vec()
 	}
 	fn write_quorum(&self) -> usize {
-		let nmembers = self.system.cluster_layout().node_ids().len();
+		let nmembers = self.system.cluster_layout().current().node_ids().len();
 		if nmembers > self.max_faults {
 			nmembers - self.max_faults
 		} else {

src/table/replication/sharded.rs

@@ -26,16 +26,20 @@ pub struct TableShardedReplication {
 
 impl TableReplication for TableShardedReplication {
 	fn read_nodes(&self, hash: &Hash) -> Vec<Uuid> {
-		let layout = self.system.cluster_layout();
-		layout.nodes_of(hash, self.replication_factor)
+		self.system
+			.cluster_layout()
+			.current()
+			.nodes_of(hash, self.replication_factor)
 	}
 	fn read_quorum(&self) -> usize {
 		self.read_quorum
 	}
 
 	fn write_nodes(&self, hash: &Hash) -> Vec<Uuid> {
-		let layout = self.system.cluster_layout();
-		layout.nodes_of(hash, self.replication_factor)
+		self.system
+			.cluster_layout()
+			.current()
+			.nodes_of(hash, self.replication_factor)
 	}
 	fn write_quorum(&self) -> usize {
 		self.write_quorum
@@ -45,9 +49,9 @@ impl TableReplication for TableShardedReplication {
 	}
 
 	fn partition_of(&self, hash: &Hash) -> Partition {
-		self.system.cluster_layout().partition_of(hash)
+		self.system.cluster_layout().current().partition_of(hash)
 	}
 	fn partitions(&self) -> Vec<(Partition, Hash)> {
-		self.system.cluster_layout().partitions()
+		self.system.cluster_layout().current().partitions()
 	}
 }

src/table/sync.rs

@@ -492,8 +492,8 @@ impl<F: TableSchema, R: TableReplication> EndpointHandler<SyncRpc> for TableSync
 
 struct SyncWorker<F: TableSchema, R: TableReplication> {
 	syncer: Arc<TableSyncer<F, R>>,
-	layout_watch: watch::Receiver<Arc<ClusterLayout>>,
-	layout: Arc<ClusterLayout>,
+	layout_watch: watch::Receiver<Arc<LayoutHistory>>,
+	layout: Arc<LayoutHistory>,
 	add_full_sync_rx: mpsc::UnboundedReceiver<()>,
 	todo: Vec<TodoPartition>,
 	next_full_sync: Instant,