Table updated trigger now happens in transaction, this is waaaay better!

src/block/manager.rs

@@ -289,28 +289,41 @@ impl BlockManager {
 
 	/// Increment the number of time a block is used, putting it to resynchronization if it is
 	/// required, but not known
-	pub fn block_incref(&self, hash: &Hash) -> Result<(), Error> {
-		if self.rc.block_incref(hash)? {
+	pub fn block_incref(self: &Arc<Self>, tx: &mut db::Transaction, hash: Hash) -> db::Result<()> {
+		if self.rc.block_incref(tx, &hash)? {
 			// When the reference counter is incremented, there is
 			// normally a node that is responsible for sending us the
 			// data of the block. However that operation may fail,
 			// so in all cases we add the block here to the todo list
 			// to check later that it arrived correctly, and if not
 			// we will fecth it from someone.
-			self.put_to_resync(hash, 2 * BLOCK_RW_TIMEOUT)?;
+			let this = self.clone();
+			tokio::spawn(async move {
+				tokio::time::sleep(Duration::from_secs(1)).await;
+				if let Err(e) = this.put_to_resync(&hash, 2 * BLOCK_RW_TIMEOUT) {
+					error!("Block {:?} could not be put in resync queue: {}.", hash, e);
+				}
+			});
 		}
 		Ok(())
 	}
 
 	/// Decrement the number of time a block is used
-	pub fn block_decref(&self, hash: &Hash) -> Result<(), Error> {
-		if self.rc.block_decref(hash)? {
+	pub fn block_decref(self: &Arc<Self>, tx: &mut db::Transaction, hash: Hash) -> db::Result<()> {
+		if self.rc.block_decref(tx, &hash)? {
 			// When the RC is decremented, it might drop to zero,
 			// indicating that we don't need the block.
 			// There is a delay before we garbage collect it;
 			// make sure that it is handled in the resync loop
 			// after that delay has passed.
-			self.put_to_resync(hash, BLOCK_GC_DELAY + Duration::from_secs(10))?;
+			let this = self.clone();
+			tokio::spawn(async move {
+				tokio::time::sleep(Duration::from_secs(1)).await;
+				if let Err(e) = this.put_to_resync(&hash, BLOCK_GC_DELAY + Duration::from_secs(10))
+				{
+					error!("Block {:?} could not be put in resync queue: {}.", hash, e);
+				}
+			});
 		}
 		Ok(())
 	}
@@ -510,12 +523,12 @@ impl BlockManager {
 		});
 	}
 
-	fn put_to_resync(&self, hash: &Hash, delay: Duration) -> Result<(), db::Error> {
+	fn put_to_resync(&self, hash: &Hash, delay: Duration) -> db::Result<()> {
 		let when = now_msec() + delay.as_millis() as u64;
 		self.put_to_resync_at(hash, when)
 	}
 
-	fn put_to_resync_at(&self, hash: &Hash, when: u64) -> Result<(), db::Error> {
+	fn put_to_resync_at(&self, hash: &Hash, when: u64) -> db::Result<()> {
 		trace!("Put resync_queue: {} {:?}", when, hash);
 		let mut key = u64::to_be_bytes(when).to_vec();
 		key.extend(hash.as_ref());

src/block/rc.rs

@@ -19,35 +19,29 @@ impl BlockRc {
 
 	/// Increment the reference counter associated to a hash.
 	/// Returns true if the RC goes from zero to nonzero.
-	pub(crate) fn block_incref(&self, hash: &Hash) -> Result<bool, Error> {
-		let old_rc = self.rc.db().transaction(|mut tx| {
-			let old_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?);
-			match old_rc.increment().serialize() {
-				Some(x) => {
-					tx.insert(&self.rc, &hash, x)?;
-				}
-				None => unreachable!(),
-			};
-			tx.commit(old_rc)
-		})?;
+	pub(crate) fn block_incref(&self, tx: &mut db::Transaction, hash: &Hash) -> db::Result<bool> {
+		let old_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?);
+		match old_rc.increment().serialize() {
+			Some(x) => {
+				tx.insert(&self.rc, &hash, x)?;
+			}
+			None => unreachable!(),
+		};
 		Ok(old_rc.is_zero())
 	}
 
 	/// Decrement the reference counter associated to a hash.
 	/// Returns true if the RC is now zero.
-	pub(crate) fn block_decref(&self, hash: &Hash) -> Result<bool, Error> {
-		let new_rc = self.rc.db().transaction(|mut tx| {
-			let new_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?).decrement();
-			match new_rc.serialize() {
-				Some(x) => {
-					tx.insert(&self.rc, &hash, x)?;
-				}
-				None => {
-					tx.remove(&self.rc, &hash)?;
-				}
-			};
-			tx.commit(new_rc)
-		})?;
+	pub(crate) fn block_decref(&self, tx: &mut db::Transaction, hash: &Hash) -> db::Result<bool> {
+		let new_rc = RcEntry::parse_opt(tx.get(&self.rc, &hash)?).decrement();
+		match new_rc.serialize() {
+			Some(x) => {
+				tx.insert(&self.rc, &hash, x)?;
+			}
+			None => {
+				tx.remove(&self.rc, &hash)?;
+			}
+		};
 		Ok(matches!(new_rc, RcEntry::Deletable { .. }))
 	}
 

src/model/index_counter.rs

@@ -116,8 +116,14 @@ impl<T: CounterSchema> TableSchema for CounterTable<T> {
 	type E = CounterEntry<T>;
 	type Filter = (DeletedFilter, Vec<Uuid>);
 
-	fn updated(&self, _old: Option<&Self::E>, _new: Option<&Self::E>) {
+	fn updated(
+		&self,
+		_tx: &mut db::Transaction,
+		_old: Option<&Self::E>,
+		_new: Option<&Self::E>,
+	) -> db::Result<()> {
 		// nothing for now
+		Ok(())
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
@@ -176,36 +182,36 @@ impl<T: CounterSchema> IndexCounter<T> {
 		this
 	}
 
-	pub fn count(&self, pk: &T::P, sk: &T::S, counts: &[(&str, i64)]) -> Result<(), Error> {
+	pub fn count(
+		&self,
+		tx: &mut db::Transaction,
+		pk: &T::P,
+		sk: &T::S,
+		counts: &[(&str, i64)],
+	) -> db::TxResult<(), Error> {
 		let tree_key = self.table.data.tree_key(pk, sk);
 
-		let new_entry = self.local_counter.db().transaction(|mut tx| {
-			let mut entry = match tx.get(&self.local_counter, &tree_key[..])? {
-				Some(old_bytes) => {
-					rmp_serde::decode::from_read_ref::<_, LocalCounterEntry>(&old_bytes)
-						.map_err(Error::RmpDecode)
-						.map_err(db::TxError::Abort)?
-				}
-				None => LocalCounterEntry {
-					values: BTreeMap::new(),
-				},
-			};
+		let mut entry = match tx.get(&self.local_counter, &tree_key[..])? {
+			Some(old_bytes) => rmp_serde::decode::from_read_ref::<_, LocalCounterEntry>(&old_bytes)
+				.map_err(Error::RmpDecode)
+				.map_err(db::TxError::Abort)?,
+			None => LocalCounterEntry {
+				values: BTreeMap::new(),
+			},
+		};
 
-			for (s, inc) in counts.iter() {
-				let mut ent = entry.values.entry(s.to_string()).or_insert((0, 0));
-				ent.0 += 1;
-				ent.1 += *inc;
-			}
+		for (s, inc) in counts.iter() {
+			let mut ent = entry.values.entry(s.to_string()).or_insert((0, 0));
+			ent.0 += 1;
+			ent.1 += *inc;
+		}
 
-			let new_entry_bytes = rmp_to_vec_all_named(&entry)
-				.map_err(Error::RmpEncode)
-				.map_err(db::TxError::Abort)?;
-			tx.insert(&self.local_counter, &tree_key[..], new_entry_bytes)?;
+		let new_entry_bytes = rmp_to_vec_all_named(&entry)
+			.map_err(Error::RmpEncode)
+			.map_err(db::TxError::Abort)?;
+		tx.insert(&self.local_counter, &tree_key[..], new_entry_bytes)?;
 
-			Ok(entry)
-		})?;
-
-		if let Err(e) = self.propagate_tx.send((pk.clone(), sk.clone(), new_entry)) {
+		if let Err(e) = self.propagate_tx.send((pk.clone(), sk.clone(), entry)) {
 			error!(
 				"Could not propagate updated counter values, failed to send to channel: {}",
 				e

src/model/k2v/item_table.rs

@@ -2,6 +2,7 @@ use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 use std::sync::Arc;
 
+use garage_db as db;
 use garage_util::data::*;
 
 use garage_table::crdt::*;
@@ -221,7 +222,12 @@ impl TableSchema for K2VItemTable {
 	type E = K2VItem;
 	type Filter = ItemFilter;
 
-	fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
+	fn updated(
+		&self,
+		tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::Result<()> {
 		// 1. Count
 		let (old_entries, old_conflicts, old_values, old_bytes) = match old {
 			None => (0, 0, 0, 0),
@@ -239,7 +245,8 @@ impl TableSchema for K2VItemTable {
 			.map(|e| &e.partition.partition_key)
 			.unwrap_or_else(|| &new.unwrap().partition.partition_key);
 
-		if let Err(e) = self.counter_table.count(
+		match self.counter_table.count(
+			tx,
 			&count_pk,
 			count_sk,
 			&[
@@ -249,13 +256,25 @@ impl TableSchema for K2VItemTable {
 				(BYTES, new_bytes - old_bytes),
 			],
 		) {
-			error!("Could not update K2V counter for bucket {:?} partition {}; counts will now be inconsistent. {}", count_pk, count_sk, e);
+			Ok(()) => (),
+			Err(db::TxError::Db(e)) => return Err(e),
+			Err(db::TxError::Abort(e)) => {
+				// This result can be returned by `counter_table.count()` for instance
+				// if messagepack serialization or deserialization fails at some step.
+				// Warn admin but ignore this error for now, that's all we can do.
+				error!(
+					"Unable to update K2V item counter for bucket {:?} partition {}: {}. Index values will be wrong!",
+					count_pk, count_sk, e
+				);
+			}
 		}
 
 		// 2. Notify
 		if let Some(new_ent) = new {
 			self.subscriptions.notify(new_ent);
 		}
+
+		Ok(())
 	}
 
 	#[allow(clippy::nonminimal_bool)]

src/model/s3/block_ref_table.rs

@@ -1,6 +1,8 @@
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
+use garage_db as db;
+
 use garage_util::data::*;
 
 use garage_table::crdt::Crdt;
@@ -51,21 +53,23 @@ impl TableSchema for BlockRefTable {
 	type E = BlockRef;
 	type Filter = DeletedFilter;
 
-	fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
+	fn updated(
+		&self,
+		tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::Result<()> {
 		#[allow(clippy::or_fun_call)]
-		let block = &old.or(new).unwrap().block;
+		let block = old.or(new).unwrap().block;
 		let was_before = old.map(|x| !x.deleted.get()).unwrap_or(false);
 		let is_after = new.map(|x| !x.deleted.get()).unwrap_or(false);
 		if is_after && !was_before {
-			if let Err(e) = self.block_manager.block_incref(block) {
-				warn!("block_incref failed for block {:?}: {}", block, e);
-			}
+			self.block_manager.block_incref(tx, block)?;
 		}
 		if was_before && !is_after {
-			if let Err(e) = self.block_manager.block_decref(block) {
-				warn!("block_decref failed for block {:?}: {}", block, e);
-			}
+			self.block_manager.block_decref(tx, block)?;
 		}
+		Ok(())
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/model/s3/object_table.rs

@@ -2,6 +2,8 @@ use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 use std::sync::Arc;
 
+use garage_db as db;
+
 use garage_util::background::BackgroundRunner;
 use garage_util::data::*;
 
@@ -232,7 +234,12 @@ impl TableSchema for ObjectTable {
 	type E = Object;
 	type Filter = ObjectFilter;
 
-	fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
+	fn updated(
+		&self,
+		_tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::Result<()> {
 		let version_table = self.version_table.clone();
 		let old = old.cloned();
 		let new = new.cloned();
@@ -259,7 +266,8 @@ impl TableSchema for ObjectTable {
 				}
 			}
 			Ok(())
-		})
+		});
+		Ok(())
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/model/s3/version_table.rs

@@ -1,6 +1,8 @@
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
+use garage_db as db;
+
 use garage_util::background::BackgroundRunner;
 use garage_util::data::*;
 
@@ -137,7 +139,12 @@ impl TableSchema for VersionTable {
 	type E = Version;
 	type Filter = DeletedFilter;
 
-	fn updated(&self, old: Option<&Self::E>, new: Option<&Self::E>) {
+	fn updated(
+		&self,
+		_tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::Result<()> {
 		let block_ref_table = self.block_ref_table.clone();
 		let old = old.cloned();
 		let new = new.cloned();
@@ -160,7 +167,9 @@ impl TableSchema for VersionTable {
 				}
 			}
 			Ok(())
-		})
+		});
+
+		Ok(())
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {

src/table/data.rs

@@ -209,17 +209,20 @@ where
 				let new_bytes_hash = blake2sum(&new_bytes[..]);
 				tx.insert(&self.merkle_todo, tree_key, new_bytes_hash.as_slice())?;
 				tx.insert(&self.store, tree_key, new_bytes)?;
-				Ok(Some((old_entry, new_entry, new_bytes_hash)))
+
+				self.instance
+					.updated(&mut tx, old_entry.as_ref(), Some(&new_entry))?;
+
+				Ok(Some((new_entry, new_bytes_hash)))
 			} else {
 				Ok(None)
 			}
 		})?;
 
-		if let Some((old_entry, new_entry, new_bytes_hash)) = changed {
+		if let Some((new_entry, new_bytes_hash)) = changed {
 			self.metrics.internal_update_counter.add(1);
 
 			let is_tombstone = new_entry.is_tombstone();
-			self.instance.updated(old_entry.as_ref(), Some(&new_entry));
 			self.merkle_todo_notify.notify_one();
 			if is_tombstone {
 				// We are only responsible for GC'ing this item if we are the
@@ -242,20 +245,23 @@ where
 	}
 
 	pub(crate) fn delete_if_equal(self: &Arc<Self>, k: &[u8], v: &[u8]) -> Result<bool, Error> {
-		let removed = self.store.db().transaction(|mut tx| {
-			let remove = matches!(tx.get(&self.store, k)?, Some(cur_v) if cur_v == v);
-			if remove {
-				tx.remove(&self.store, k)?;
-				tx.insert(&self.merkle_todo, k, vec![])?;
-			}
-			Ok(remove)
-		})?;
+		let removed = self
+			.store
+			.db()
+			.transaction(|mut tx| match tx.get(&self.store, k)? {
+				Some(cur_v) if cur_v == v => {
+					tx.remove(&self.store, k)?;
+					tx.insert(&self.merkle_todo, k, vec![])?;
+
+					let old_entry = self.decode_entry(v).map_err(db::TxError::Abort)?;
+					self.instance.updated(&mut tx, Some(&old_entry), None)?;
+					Ok(true)
+				}
+				_ => Ok(false),
+			})?;
 
 		if removed {
 			self.metrics.internal_delete_counter.add(1);
-
-			let old_entry = self.decode_entry(v)?;
-			self.instance.updated(Some(&old_entry), None);
 			self.merkle_todo_notify.notify_one();
 		}
 		Ok(removed)
@@ -266,26 +272,26 @@ where
 		k: &[u8],
 		vhash: Hash,
 	) -> Result<bool, Error> {
-		let removed = self.store.db().transaction(|mut tx| {
-			let remove_v = match tx.get(&self.store, k)? {
-				Some(cur_v) if blake2sum(&cur_v[..]) == vhash => Some(cur_v),
-				_ => None,
-			};
-			if remove_v.is_some() {
-				tx.remove(&self.store, k)?;
-				tx.insert(&self.merkle_todo, k, vec![])?;
-			}
-			Ok(remove_v)
-		})?;
+		let removed = self
+			.store
+			.db()
+			.transaction(|mut tx| match tx.get(&self.store, k)? {
+				Some(cur_v) if blake2sum(&cur_v[..]) == vhash => {
+					tx.remove(&self.store, k)?;
+					tx.insert(&self.merkle_todo, k, vec![])?;
 
-		if let Some(old_v) = removed {
-			let old_entry = self.decode_entry(&old_v[..])?;
-			self.instance.updated(Some(&old_entry), None);
+					let old_entry = self.decode_entry(&cur_v[..]).map_err(db::TxError::Abort)?;
+					self.instance.updated(&mut tx, Some(&old_entry), None)?;
+					Ok(true)
+				}
+				_ => Ok(false),
+			})?;
+
+		if removed {
+			self.metrics.internal_delete_counter.add(1);
 			self.merkle_todo_notify.notify_one();
-			Ok(true)
-		} else {
-			Ok(false)
 		}
+		Ok(removed)
 	}
 
 	// ---- Utility functions ----

src/table/schema.rs

@@ -1,5 +1,6 @@
 use serde::{Deserialize, Serialize};
 
+use garage_db as db;
 use garage_util::data::*;
 
 use crate::crdt::Crdt;
@@ -82,11 +83,19 @@ pub trait TableSchema: Send + Sync {
 		None
 	}
 
-	// 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>) {}
+	/// Actions triggered by data changing in a table. If such actions
+	/// include updates to the local database that should be applied
+	/// atomically with the item update itself, a db transaction is
+	/// provided on which these changes should be done.
+	/// This function can return a DB error but that's all.
+	fn updated(
+		&self,
+		_tx: &mut db::Transaction,
+		_old: Option<&Self::E>,
+		_new: Option<&Self::E>,
+	) -> db::Result<()> {
+		Ok(())
+	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool;
 }