Spawn all background workers in a separate step

5 files changed, 54 insertions, 37 deletions

diff --git a/src/table/Cargo.toml b/src/table/Cargo.toml
index 38c6b41c..a8d9b5e6 100644
--- a/src/table/Cargo.toml
+++ b/src/table/Cargo.toml
@@ -21,6 +21,7 @@ garage_util = { version = "0.8.0", path = "../util" }
 opentelemetry = "0.17"
 
 async-trait = "0.1.7"
+arc-swap = "1.0"
 bytes = "1.0"
 hex = "0.4"
 hexdump = "0.1"
diff --git a/src/table/gc.rs b/src/table/gc.rs
index cfdc9d2d..c83c2050 100644
--- a/src/table/gc.rs
+++ b/src/table/gc.rs
@@ -54,24 +54,27 @@ where
 	F: TableSchema + 'static,
 	R: TableReplication + 'static,
 {
-	pub(crate) fn launch(system: Arc<System>, data: Arc<TableData<F, R>>) -> Arc<Self> {
+	pub(crate) fn new(system: Arc<System>, data: Arc<TableData<F, R>>) -> Arc<Self> {
 		let endpoint = system
 			.netapp
 			.endpoint(format!("garage_table/gc.rs/Rpc:{}", F::TABLE_NAME));
 
 		let gc = Arc::new(Self {
-			system: system.clone(),
+			system,
 			data,
 			endpoint,
 		});
-
 		gc.endpoint.set_handler(gc.clone());
 
-		system.background.spawn_worker(GcWorker::new(gc.clone()));
-
 		gc
 	}
 
+	pub(crate) fn spawn_workers(self: &Arc<Self>) {
+		self.system
+			.background
+			.spawn_worker(GcWorker::new(self.clone()));
+	}
+
 	async fn gc_loop_iter(&self) -> Result<Option<Duration>, Error> {
 		let now = now_msec();
 
diff --git a/src/table/merkle.rs b/src/table/merkle.rs
index bcf9f9d7..0fe7d2cb 100644
--- a/src/table/merkle.rs
+++ b/src/table/merkle.rs
@@ -70,17 +70,17 @@ where
 	F: TableSchema + 'static,
 	R: TableReplication + 'static,
 {
-	pub(crate) fn launch(background: &BackgroundRunner, data: Arc<TableData<F, R>>) -> Arc<Self> {
+	pub(crate) fn new(data: Arc<TableData<F, R>>) -> Arc<Self> {
 		let empty_node_hash = blake2sum(&rmp_to_vec_all_named(&MerkleNode::Empty).unwrap()[..]);
 
-		let ret = Arc::new(Self {
+		Arc::new(Self {
 			data,
 			empty_node_hash,
-		});
-
-		background.spawn_worker(MerkleWorker(ret.clone()));
+		})
+	}
 
-		ret
+	pub(crate) fn spawn_workers(self: &Arc<Self>, background: &BackgroundRunner) {
+		background.spawn_worker(MerkleWorker(self.clone()));
 	}
 
 	fn updater_loop_iter(&self) -> Result<WorkerState, Error> {
diff --git a/src/table/sync.rs b/src/table/sync.rs
index af7aa640..7008a383 100644
--- a/src/table/sync.rs
+++ b/src/table/sync.rs
@@ -2,6 +2,7 @@ use std::collections::VecDeque;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 
+use arc_swap::ArcSwapOption;
 use async_trait::async_trait;
 use futures_util::stream::*;
 use opentelemetry::KeyValue;
@@ -13,7 +14,7 @@ use tokio::sync::{mpsc, watch};
 
 use garage_util::background::*;
 use garage_util::data::*;
-use garage_util::error::Error;
+use garage_util::error::{Error, OkOrMessage};
 
 use garage_rpc::ring::*;
 use garage_rpc::system::System;
@@ -32,7 +33,7 @@ pub struct TableSyncer<F: TableSchema + 'static, R: TableReplication + 'static>
 	data: Arc<TableData<F, R>>,
 	merkle: Arc<MerkleUpdater<F, R>>,
 
-	add_full_sync_tx: mpsc::UnboundedSender<()>,
+	add_full_sync_tx: ArcSwapOption<mpsc::UnboundedSender<()>>,
 	endpoint: Arc<Endpoint<SyncRpc, Self>>,
 }
 
@@ -65,7 +66,7 @@ where
 	F: TableSchema + 'static,
 	R: TableReplication + 'static,
 {
-	pub(crate) fn launch(
+	pub(crate) fn new(
 		system: Arc<System>,
 		data: Arc<TableData<F, R>>,
 		merkle: Arc<MerkleUpdater<F, R>>,
@@ -74,34 +75,40 @@ where
 			.netapp
 			.endpoint(format!("garage_table/sync.rs/Rpc:{}", F::TABLE_NAME));
 
-		let (add_full_sync_tx, add_full_sync_rx) = mpsc::unbounded_channel();
-
 		let syncer = Arc::new(Self {
-			system: system.clone(),
+			system,
 			data,
 			merkle,
-			add_full_sync_tx,
+			add_full_sync_tx: ArcSwapOption::new(None),
 			endpoint,
 		});
-
 		syncer.endpoint.set_handler(syncer.clone());
 
-		system.background.spawn_worker(SyncWorker {
-			syncer: syncer.clone(),
-			ring_recv: system.ring.clone(),
-			ring: system.ring.borrow().clone(),
+		syncer
+	}
+
+	pub(crate) fn spawn_workers(self: &Arc<Self>) {
+		let (add_full_sync_tx, add_full_sync_rx) = mpsc::unbounded_channel();
+		self.add_full_sync_tx
+			.store(Some(Arc::new(add_full_sync_tx)));
+
+		self.system.background.spawn_worker(SyncWorker {
+			syncer: self.clone(),
+			ring_recv: self.system.ring.clone(),
+			ring: self.system.ring.borrow().clone(),
 			add_full_sync_rx,
 			todo: vec![],
 			next_full_sync: Instant::now() + Duration::from_secs(20),
 		});
-
-		syncer
 	}
 
-	pub fn add_full_sync(&self) {
-		if self.add_full_sync_tx.send(()).is_err() {
-			error!("({}) Could not add full sync", F::TABLE_NAME);
-		}
+	pub fn add_full_sync(&self) -> Result<(), Error> {
+		let tx = self.add_full_sync_tx.load();
+		let tx = tx
+			.as_ref()
+			.ok_or_message("table sync worker is not running")?;
+		tx.send(()).ok_or_message("send error")?;
+		Ok(())
 	}
 
 	// ----
diff --git a/src/table/table.rs b/src/table/table.rs
index c8e0576e..cb200ef2 100644
--- a/src/table/table.rs
+++ b/src/table/table.rs
@@ -36,6 +36,7 @@ pub struct Table<F: TableSchema + 'static, R: TableReplication + 'static> {
 	pub data: Arc<TableData<F, R>>,
 	pub merkle_updater: Arc<MerkleUpdater<F, R>>,
 	pub syncer: Arc<TableSyncer<F, R>>,
+	gc: Arc<TableGc<F, R>>,
 	endpoint: Arc<Endpoint<TableRpc<F>, Self>>,
 }
 
@@ -76,29 +77,34 @@ where
 
 		let data = TableData::new(system.clone(), instance, replication, db);
 
-		let merkle_updater = MerkleUpdater::launch(&system.background, data.clone());
+		let merkle_updater = MerkleUpdater::new(data.clone());
 
-		let syncer = TableSyncer::launch(system.clone(), data.clone(), merkle_updater.clone());
-		TableGc::launch(system.clone(), data.clone());
+		let syncer = TableSyncer::new(system.clone(), data.clone(), merkle_updater.clone());
+		let gc = TableGc::new(system.clone(), data.clone());
 
 		let table = Arc::new(Self {
 			system,
 			data,
 			merkle_updater,
+			gc,
 			syncer,
 			endpoint,
 		});
 
-		table
-			.system
-			.background
-			.spawn_worker(InsertQueueWorker(table.clone()));
-
 		table.endpoint.set_handler(table.clone());
 
 		table
 	}
 
+	pub fn spawn_workers(self: &Arc<Self>) {
+		self.merkle_updater.spawn_workers(&self.system.background);
+		self.syncer.spawn_workers();
+		self.gc.spawn_workers();
+		self.system
+			.background
+			.spawn_worker(InsertQueueWorker(self.clone()));
+	}
+
 	pub async fn insert(&self, e: &F::E) -> Result<(), Error> {
 		let tracer = opentelemetry::global::tracer("garage_table");
 		let span = tracer.start(format!("{} insert", F::TABLE_NAME));