Make updated() be a sync function that doesn't fail

src/model/block_ref_table.rs

@@ -1,10 +1,8 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
 use garage_util::background::*;
 use garage_util::data::*;
-use garage_util::error::Error;
 
 use garage_table::*;
 
@@ -42,24 +40,26 @@ pub struct BlockRefTable {
 	pub block_manager: Arc<BlockManager>,
 }
 
-#[async_trait]
 impl TableSchema for BlockRefTable {
 	type P = Hash;
 	type S = UUID;
 	type E = BlockRef;
 	type Filter = DeletedFilter;
 
-	async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error> {
+	fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) {
 		let block = &old.as_ref().or(new.as_ref()).unwrap().block;
 		let was_before = old.as_ref().map(|x| !x.deleted).unwrap_or(false);
 		let is_after = new.as_ref().map(|x| !x.deleted).unwrap_or(false);
 		if is_after && !was_before {
-			self.block_manager.block_incref(block)?;
+			if let Err(e) = self.block_manager.block_incref(block) {
+				warn!("block_incref failed for block {:?}: {}", block, e);
+			}
 		}
 		if was_before && !is_after {
-			self.block_manager.block_decref(block)?;
+			if let Err(e) = self.block_manager.block_decref(block) {
+				warn!("block_decref failed for block {:?}: {}", block, e);
+			}
 		}
-		Ok(())
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/model/bucket_table.rs

@@ -1,10 +1,8 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 
 use garage_table::crdt::CRDT;
 use garage_table::*;
 
-use garage_util::error::Error;
 
 use crate::key_table::PermissionSet;
 
@@ -100,17 +98,12 @@ impl Entry<EmptyKey, String> for Bucket {
 
 pub struct BucketTable;
 
-#[async_trait]
 impl TableSchema for BucketTable {
 	type P = EmptyKey;
 	type S = String;
 	type E = Bucket;
 	type Filter = DeletedFilter;
 
-	async fn updated(&self, _old: Option<Self::E>, _new: Option<Self::E>) -> Result<(), Error> {
-		Ok(())
-	}
-
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
 		filter.apply(entry.is_deleted())
 	}

src/model/key_table.rs

@@ -1,11 +1,8 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 
 use garage_table::crdt::CRDT;
 use garage_table::*;
 
-use garage_util::error::Error;
-
 use model010::key_table as prev;
 
 #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
@@ -92,17 +89,12 @@ impl Entry<EmptyKey, String> for Key {
 
 pub struct KeyTable;
 
-#[async_trait]
 impl TableSchema for KeyTable {
 	type P = EmptyKey;
 	type S = String;
 	type E = Key;
 	type Filter = DeletedFilter;
 
-	async fn updated(&self, _old: Option<Self::E>, _new: Option<Self::E>) -> Result<(), Error> {
-		Ok(())
-	}
-
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
 		filter.apply(entry.deleted.get())
 	}

src/model/object_table.rs

@@ -1,11 +1,9 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 use std::sync::Arc;
 
 use garage_util::background::BackgroundRunner;
 use garage_util::data::*;
-use garage_util::error::Error;
 
 use garage_table::table_sharded::*;
 use garage_table::*;
@@ -191,15 +189,15 @@ pub struct ObjectTable {
 	pub version_table: Arc<Table<VersionTable, TableShardedReplication>>,
 }
 
-#[async_trait]
 impl TableSchema for ObjectTable {
 	type P = String;
 	type S = String;
 	type E = Object;
 	type Filter = DeletedFilter;
 
-	async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error> {
+	fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) {
 		let version_table = self.version_table.clone();
+		self.background.spawn(async move {
 			if let (Some(old_v), Some(new_v)) = (old, new) {
 				// Propagate deletion of old versions
 				for v in old_v.versions.iter() {
@@ -226,6 +224,7 @@ impl TableSchema for ObjectTable {
 				}
 			}
 			Ok(())
+		})
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/model/version_table.rs

@@ -1,10 +1,8 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
 use garage_util::background::BackgroundRunner;
 use garage_util::data::*;
-use garage_util::error::Error;
 
 use garage_table::table_sharded::*;
 use garage_table::*;
@@ -112,15 +110,15 @@ pub struct VersionTable {
 	pub block_ref_table: Arc<Table<BlockRefTable, TableShardedReplication>>,
 }
 
-#[async_trait]
 impl TableSchema for VersionTable {
 	type P = Hash;
 	type S = EmptyKey;
 	type E = Version;
 	type Filter = DeletedFilter;
 
-	async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error> {
+	fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) {
 		let block_ref_table = self.block_ref_table.clone();
+		self.background.spawn(async move {
 			if let (Some(old_v), Some(new_v)) = (old, new) {
 				// Propagate deletion of version blocks
 				if new_v.deleted && !old_v.deleted {
@@ -137,6 +135,7 @@ impl TableSchema for VersionTable {
 				}
 			}
 			Ok(())
+		})
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/table/schema.rs

@@ -1,8 +1,6 @@
-use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 
 use garage_util::data::*;
-use garage_util::error::Error;
 
 pub trait PartitionKey {
 	fn hash(&self) -> Hash;
@@ -45,7 +43,6 @@ pub trait Entry<P: PartitionKey, S: SortKey>:
 	fn merge(&mut self, other: &Self);
 }
 
-#[async_trait]
 pub trait TableSchema: Send + Sync {
 	type P: PartitionKey + Clone + PartialEq + Serialize + for<'de> Deserialize<'de> + Send + Sync;
 	type S: SortKey + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync;
@@ -58,7 +55,12 @@ pub trait TableSchema: Send + Sync {
 		None
 	}
 
-	async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error>;
+	// Updated triggers some stuff downstream, but it is not supposed to block or fail,
+	// as the update itself is an unchangeable fact that will never go back
+	// due to CRDT logic. Typically errors in propagation of info should be logged
+	// to stderr.
+	fn updated(&self, _old: Option<Self::E>, _new: Option<Self::E>) {}
+
 	fn matches_filter(_entry: &Self::E, _filter: &Self::Filter) -> bool {
 		true
 	}

src/table/table.rs

@@ -414,7 +414,7 @@ where
 					epidemic_propagate.push(new_entry.clone());
 				}
 
-				self.instance.updated(old_entry, Some(new_entry)).await?;
+				self.instance.updated(old_entry, Some(new_entry));
 				syncer.invalidate(&tree_key[..]);
 			}
 		}
@@ -429,7 +429,7 @@ where
 		Ok(())
 	}
 
-	pub(crate) async fn delete_if_equal(
+	pub(crate) fn delete_if_equal(
 		self: &Arc<Self>,
 		k: &[u8],
 		v: &[u8],
@@ -445,7 +445,7 @@ where
 		})?;
 		if removed {
 			let old_entry = self.decode_entry(v)?;
-			self.instance.updated(Some(old_entry), None).await?;
+			self.instance.updated(Some(old_entry), None);
 			self.syncer.load_full().unwrap().invalidate(k);
 		}
 		Ok(removed)

src/table/table_sync.rs

@@ -348,14 +348,8 @@ where
 		}
 
 		// All remote nodes have written those items, now we can delete them locally
-		for was_removed in join_all(
+		for (k, v) in items.iter() {
-			items
+			self.table.delete_if_equal(&k[..], &v[..])?;
-				.iter()
-				.map(|(k, v)| self.table.delete_if_equal(&k[..], &v[..])),
-		)
-		.await
-		{
-			was_removed?;
 		}
 
 		Ok(())