Make syncer have its own rpc client/server

src/table/merkle.rs

@@ -109,11 +109,17 @@ impl MerkleUpdater {
 				match x {
 					Ok((key, valhash)) => {
 						if let Err(e) = self.update_item(&key[..], &valhash[..]) {
-							warn!("({}) Error while updating Merkle tree item: {}", self.table_name, e);
+							warn!(
+								"({}) Error while updating Merkle tree item: {}",
+								self.table_name, e
+							);
 						}
 					}
 					Err(e) => {
-						warn!("({}) Error while iterating on Merkle todo tree: {}", self.table_name, e);
+						warn!(
+							"({}) Error while iterating on Merkle todo tree: {}",
+							self.table_name, e
+						);
 						tokio::time::delay_for(Duration::from_secs(10)).await;
 					}
 				}
@@ -154,8 +160,7 @@ impl MerkleUpdater {
 		if !deleted {
 			debug!(
 				"({}) Item not deleted from Merkle todo because it changed: {:?}",
-				self.table_name,
-				k
+				self.table_name, k
 			);
 		}
 		Ok(())
@@ -196,7 +201,10 @@ impl MerkleUpdater {
 
 					if children.len() == 0 {
 						// should not happen
-						warn!("({}) Replacing intermediate node with empty node, should not happen.", self.table_name);
+						warn!(
+							"({}) Replacing intermediate node with empty node, should not happen.",
+							self.table_name
+						);
 						Some(MerkleNode::Empty)
 					} else if children.len() == 1 {
 						// We now have a single node (case when the update deleted one of only two

src/table/sync.rs

@@ -12,10 +12,13 @@ use serde::{Deserialize, Serialize};
 use serde_bytes::ByteBuf;
 use tokio::sync::{mpsc, watch};
 
-use garage_rpc::ring::Ring;
 use garage_util::data::*;
 use garage_util::error::Error;
 
+use garage_rpc::ring::Ring;
+use garage_rpc::rpc_client::*;
+use garage_rpc::rpc_server::*;
+
 use crate::data::*;
 use crate::merkle::*;
 use crate::replication::*;
@@ -31,6 +34,7 @@ pub struct TableSyncer<F: TableSchema, R: TableReplication> {
 	aux: Arc<TableAux<F, R>>,
 
 	todo: Mutex<SyncTodo>,
+	rpc_client: Arc<RpcClient<SyncRPC>>,
 }
 
 type RootCk = Vec<(MerklePartition, Hash)>;
@@ -49,8 +53,12 @@ pub(crate) enum SyncRPC {
 	CkNoDifference,
 	GetNode(MerkleNodeKey),
 	Node(MerkleNodeKey, MerkleNode),
+	Items(Vec<Arc<ByteBuf>>),
+	Ok,
 }
 
+impl RpcMessage for SyncRPC {}
+
 struct SyncTodo {
 	todo: Vec<TodoPartition>,
 }
@@ -68,15 +76,25 @@ where
 	F: TableSchema + 'static,
 	R: TableReplication + 'static,
 {
-	pub(crate) fn launch(data: Arc<TableData<F>>, aux: Arc<TableAux<F, R>>) -> Arc<Self> {
+	pub(crate) fn launch(
+		data: Arc<TableData<F>>,
+		aux: Arc<TableAux<F, R>>,
+		rpc_server: &mut RpcServer,
+	) -> Arc<Self> {
+		let rpc_path = format!("table_{}/sync", data.name);
+		let rpc_client = aux.system.rpc_client::<SyncRPC>(&rpc_path);
+
 		let todo = SyncTodo { todo: vec![] };
 
 		let syncer = Arc::new(Self {
 			data: data.clone(),
 			aux: aux.clone(),
 			todo: Mutex::new(todo),
+			rpc_client,
 		});
 
+		syncer.register_handler(rpc_server, rpc_path);
+
 		let (busy_tx, busy_rx) = mpsc::unbounded_channel();
 
 		let s1 = syncer.clone();
@@ -100,6 +118,21 @@ where
 		syncer
 	}
 
+	fn register_handler(self: &Arc<Self>, rpc_server: &mut RpcServer, path: String) {
+		let self2 = self.clone();
+		rpc_server.add_handler::<SyncRPC, _, _>(path, move |msg, _addr| {
+			let self2 = self2.clone();
+			async move { self2.handle_rpc(&msg).await }
+		});
+
+		let self2 = self.clone();
+		self.rpc_client
+			.set_local_handler(self.aux.system.id, move |msg| {
+				let self2 = self2.clone();
+				async move { self2.handle_rpc(&msg).await }
+			});
+	}
+
 	async fn watcher_task(
 		self: Arc<Self>,
 		mut must_exit: watch::Receiver<bool>,
@@ -278,11 +311,16 @@ where
 					.into_iter()
 					.collect::<Vec<_>>();
 				if nodes.contains(&self.aux.system.id) {
-					warn!("({}) Interrupting offload as partitions seem to have changed", self.data.name);
+					warn!(
+						"({}) Interrupting offload as partitions seem to have changed",
+						self.data.name
+					);
 					break;
 				}
 				if nodes.len() < self.aux.replication.write_quorum(&self.aux.system) {
-					return Err(Error::Message(format!("Not offloading as we don't have a quorum of nodes to write to.")));
+					return Err(Error::Message(format!(
+						"Not offloading as we don't have a quorum of nodes to write to."
+					)));
 				}
 
 				counter += 1;
@@ -309,11 +347,10 @@ where
 		nodes: &[UUID],
 	) -> Result<(), Error> {
 		let values = items.iter().map(|(_k, v)| v.clone()).collect::<Vec<_>>();
-		let update_msg = Arc::new(TableRPC::<F>::Update(values));
+		let update_msg = Arc::new(SyncRPC::Items(values));
 
 		for res in join_all(nodes.iter().map(|to| {
-			self.aux
-				.rpc_client
+			self.rpc_client
 				.call_arc(*to, update_msg.clone(), TABLE_SYNC_RPC_TIMEOUT)
 		}))
 		.await
@@ -380,31 +417,30 @@ where
 				"({}) Sync {:?} with {:?}: partition is empty.",
 				self.data.name, partition, who
 			);
-			return Ok(())
+			return Ok(());
 		}
 
 		let root_ck_hash = hash_of(&root_ck)?;
 
 		// If their root checksum has level > than us, use that as a reference
 		let root_resp = self
-			.aux
 			.rpc_client
 			.call(
 				who,
-				TableRPC::<F>::SyncRPC(SyncRPC::RootCkHash(partition.range, root_ck_hash)),
+				SyncRPC::RootCkHash(partition.range, root_ck_hash),
 				TABLE_SYNC_RPC_TIMEOUT,
 			)
 			.await?;
 
 		let mut todo = match root_resp {
-			TableRPC::<F>::SyncRPC(SyncRPC::CkNoDifference) => {
+			SyncRPC::CkNoDifference => {
 				debug!(
 					"({}) Sync {:?} with {:?}: no difference",
 					self.data.name, partition, who
 				);
 				return Ok(());
 			}
-			TableRPC::<F>::SyncRPC(SyncRPC::RootCkList(_, their_root_ck)) => {
+			SyncRPC::RootCkList(_, their_root_ck) => {
 				let join = join_ordered(&root_ck[..], &their_root_ck[..]);
 				let mut todo = VecDeque::new();
 				for (p, v1, v2) in join.iter() {
@@ -464,16 +500,11 @@ where
 					// Get Merkle node for this tree position at remote node
 					// and compare it with local node
 					let remote_node = match self
-						.aux
 						.rpc_client
-						.call(
-							who,
-							TableRPC::<F>::SyncRPC(SyncRPC::GetNode(key.clone())),
-							TABLE_SYNC_RPC_TIMEOUT,
-						)
+						.call(who, SyncRPC::GetNode(key.clone()), TABLE_SYNC_RPC_TIMEOUT)
 						.await?
 					{
-						TableRPC::<F>::SyncRPC(SyncRPC::Node(_, node)) => node,
+						SyncRPC::Node(_, node) => node,
 						x => {
 							return Err(Error::Message(format!(
 								"Invalid respone to GetNode RPC: {}",
@@ -525,16 +556,16 @@ where
 			who
 		);
 
-		let values = item_value_list.into_iter()
+		let values = item_value_list
+			.into_iter()
 			.map(|x| Arc::new(ByteBuf::from(x)))
 			.collect::<Vec<_>>();
 
 		let rpc_resp = self
-			.aux
 			.rpc_client
-			.call(who, TableRPC::<F>::Update(values), TABLE_SYNC_RPC_TIMEOUT)
+			.call(who, SyncRPC::Items(values), TABLE_SYNC_RPC_TIMEOUT)
 			.await?;
-		if let TableRPC::<F>::Ok = rpc_resp {
+		if let SyncRPC::Ok = rpc_resp {
 			Ok(())
 		} else {
 			Err(Error::Message(format!(
@@ -561,6 +592,10 @@ where
 				let node = self.data.merkle_updater.read_node(&k)?;
 				Ok(SyncRPC::Node(k.clone(), node))
 			}
+			SyncRPC::Items(items) => {
+				self.data.update_many(items)?;
+				Ok(SyncRPC::Ok)
+			}
 			_ => Err(Error::Message(format!("Unexpected sync RPC"))),
 		}
 	}

src/table/table.rs

@@ -24,7 +24,7 @@ const TABLE_RPC_TIMEOUT: Duration = Duration::from_secs(10);
 pub struct TableAux<F: TableSchema, R: TableReplication> {
 	pub system: Arc<System>,
 	pub replication: R,
-	pub(crate) rpc_client: Arc<RpcClient<TableRPC<F>>>,
+	rpc_client: Arc<RpcClient<TableRPC<F>>>,
 }
 
 pub struct Table<F: TableSchema, R: TableReplication> {
@@ -76,7 +76,7 @@ where
 			rpc_client,
 		});
 
-		let syncer = TableSyncer::launch(data.clone(), aux.clone());
+		let syncer = TableSyncer::launch(data.clone(), aux.clone(), rpc_server);
 
 		let table = Arc::new(Self { data, aux, syncer });