Convert bucket table to better CRDT representation

src/garage/admin_rpc.rs

@@ -2,11 +2,10 @@ use std::sync::Arc;
 
 use serde::{Deserialize, Serialize};
 
-use garage_util::data::*;
 use garage_util::error::Error;
 
-use garage_table::*;
 use garage_table::crdt::CRDT;
+use garage_table::*;
 
 use garage_rpc::rpc_client::*;
 use garage_rpc::rpc_server::*;
@@ -80,25 +79,26 @@ impl AdminRpcHandler {
 				Ok(AdminRPC::BucketInfo(bucket))
 			}
 			BucketOperation::Create(query) => {
-				let bucket = self.garage.bucket_table.get(&EmptyKey, &query.name).await?;
+				let bucket = match self.garage.bucket_table.get(&EmptyKey, &query.name).await? {
-				if bucket.as_ref().filter(|b| !b.deleted).is_some() {
+					Some(mut bucket) => {
+						if !bucket.is_deleted() {
 							return Err(Error::BadRPC(format!(
 								"Bucket {} already exists",
 								query.name
 							)));
 						}
-				let new_time = match bucket {
+						bucket
-					Some(b) => std::cmp::max(b.timestamp + 1, now_msec()),
+							.state
-					None => now_msec(),
+							.update(BucketState::Present(crdt::LWWMap::new()));
+						bucket
+					}
+					None => Bucket::new(query.name.clone()),
 				};
-				self.garage
+				self.garage.bucket_table.insert(&bucket).await?;
-					.bucket_table
-					.insert(&Bucket::new(query.name.clone(), new_time, false, vec![]))
-					.await?;
 				Ok(AdminRPC::Ok(format!("Bucket {} was created.", query.name)))
 			}
 			BucketOperation::Delete(query) => {
-				let bucket = self.get_existing_bucket(&query.name).await?;
+				let mut bucket = self.get_existing_bucket(&query.name).await?;
 				let objects = self
 					.garage
 					.object_table
@@ -113,25 +113,18 @@ impl AdminRpcHandler {
 					)));
 				}
 				// --- done checking, now commit ---
-				for ak in bucket.authorized_keys() {
+				for (key_id, _, _) in bucket.authorized_keys() {
-					if let Some(key) = self.garage.key_table.get(&EmptyKey, &ak.key_id).await? {
+					if let Some(key) = self.garage.key_table.get(&EmptyKey, key_id).await? {
 						if !key.deleted.get() {
 							self.update_key_bucket(key, &bucket.name, false, false)
 								.await?;
 						}
 					} else {
-						return Err(Error::Message(format!("Key not found: {}", ak.key_id)));
+						return Err(Error::Message(format!("Key not found: {}", key_id)));
 					}
 				}
-				self.garage
+				bucket.state.update(BucketState::Deleted);
-					.bucket_table
+				self.garage.bucket_table.insert(&bucket).await?;
-					.insert(&Bucket::new(
-						query.name.clone(),
-						std::cmp::max(bucket.timestamp + 1, now_msec()),
-						true,
-						vec![],
-					))
-					.await?;
 				Ok(AdminRPC::Ok(format!("Bucket {} was deleted.", query.name)))
 			}
 			BucketOperation::Allow(query) => {
@@ -202,10 +195,8 @@ impl AdminRpcHandler {
 				}
 				// --- done checking, now commit ---
 				for (ab_name, _, _) in key.authorized_buckets.items().iter() {
-					if let Some(bucket) =
+					if let Some(bucket) = self.garage.bucket_table.get(&EmptyKey, ab_name).await? {
-						self.garage.bucket_table.get(&EmptyKey, ab_name).await?
+						if !bucket.is_deleted() {
-					{
-						if !bucket.deleted {
 							self.update_bucket_key(bucket, &key.key_id, false, false)
 								.await?;
 						}
@@ -228,7 +219,7 @@ impl AdminRpcHandler {
 			.bucket_table
 			.get(&EmptyKey, bucket)
 			.await?
-			.filter(|b| !b.deleted)
+			.filter(|b| !b.is_deleted())
 			.map(Ok)
 			.unwrap_or(Err(Error::BadRPC(format!(
 				"Bucket {} does not exist",
@@ -253,24 +244,20 @@ impl AdminRpcHandler {
 		allow_read: bool,
 		allow_write: bool,
 	) -> Result<(), Error> {
-		let timestamp = match bucket
+		if let BucketState::Present(ak) = bucket.state.get_mut() {
-			.authorized_keys()
+			let old_ak = ak.take_and_clear();
-			.iter()
+			ak.merge(&old_ak.update_mutator(
-			.find(|x| x.key_id == *key_id)
+				key_id.to_string(),
-		{
+				PermissionSet {
-			None => now_msec(),
-			Some(ab) => std::cmp::max(ab.timestamp + 1, now_msec()),
-		};
-		bucket.clear_keys();
-		bucket
-			.add_key(AllowedKey {
-				key_id: key_id.clone(),
-				timestamp,
 					allow_read,
 					allow_write,
-			})
+				},
-			.unwrap();
+			));
-		self.garage.bucket_table.insert(&bucket).await?;
+		} else {
+			return Err(Error::Message(format!(
+				"Bucket is deleted in update_bucket_key"
+			)));
+		}
 		Ok(())
 	}
 
@@ -282,12 +269,12 @@ impl AdminRpcHandler {
 		allow_write: bool,
 	) -> Result<(), Error> {
 		let old_map = key.authorized_buckets.take_and_clear();
-		key.authorized_buckets.merge(
+		key.authorized_buckets.merge(&old_map.update_mutator(
-			&old_map.update_mutator(
 			bucket.clone(),
 			PermissionSet {
-					allow_read, allow_write
+				allow_read,
-				}
+				allow_write,
+			},
 		));
 		self.garage.key_table.insert(&key).await?;
 		Ok(())

src/model/block.rs

@@ -20,7 +20,7 @@ use garage_rpc::rpc_client::*;
 use garage_rpc::rpc_server::*;
 
 use garage_table::table_sharded::TableShardedReplication;
-use garage_table::{TableReplication, DeletedFilter};
+use garage_table::{DeletedFilter, TableReplication};
 
 use crate::block_ref_table::*;
 

src/model/bucket_table.rs

@@ -1,69 +1,59 @@
 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;
+
+use model010::bucket_table as prev;
+
 #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
 pub struct Bucket {
 	// Primary key
 	pub name: String,
 
-	// Timestamp and deletion
+	pub state: crdt::LWW<BucketState>,
-	// Upon version increment, all info is replaced
-	pub timestamp: u64,
-	pub deleted: bool,
-
-	// Authorized keys
-	authorized_keys: Vec<AllowedKey>,
-}
-
-impl Bucket {
-	pub fn new(
-		name: String,
-		timestamp: u64,
-		deleted: bool,
-		authorized_keys: Vec<AllowedKey>,
-	) -> Self {
-		let mut ret = Bucket {
-			name,
-			timestamp,
-			deleted,
-			authorized_keys: vec![],
-		};
-		for key in authorized_keys {
-			ret.add_key(key)
-				.expect("Duplicate AllowedKey in Bucket constructor");
-		}
-		ret
-	}
-	/// Add a key only if it is not already present
-	pub fn add_key(&mut self, key: AllowedKey) -> Result<(), ()> {
-		match self
-			.authorized_keys
-			.binary_search_by(|k| k.key_id.cmp(&key.key_id))
-		{
-			Err(i) => {
-				self.authorized_keys.insert(i, key);
-				Ok(())
-			}
-			Ok(_) => Err(()),
-		}
-	}
-	pub fn authorized_keys(&self) -> &[AllowedKey] {
-		&self.authorized_keys[..]
-	}
-	pub fn clear_keys(&mut self) {
-		self.authorized_keys.clear();
-	}
 }
 
 #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
-pub struct AllowedKey {
+pub enum BucketState {
-	pub key_id: String,
+	Deleted,
-	pub timestamp: u64,
+	Present(crdt::LWWMap<String, PermissionSet>),
-	pub allow_read: bool,
+}
-	pub allow_write: bool,
+
+impl CRDT for BucketState {
+	fn merge(&mut self, o: &Self) {
+		match o {
+			BucketState::Deleted => *self = BucketState::Deleted,
+			BucketState::Present(other_ak) => {
+				if let BucketState::Present(ak) = self {
+					ak.merge(other_ak);
+				}
+			}
+		}
+	}
+}
+
+impl Bucket {
+	pub fn new(name: String) -> Self {
+		let ret = Bucket {
+			name,
+			state: crdt::LWW::new(BucketState::Present(crdt::LWWMap::new())),
+		};
+		ret
+	}
+	pub fn is_deleted(&self) -> bool {
+		*self.state.get() == BucketState::Deleted
+	}
+	pub fn authorized_keys(&self) -> &[(String, u64, PermissionSet)] {
+		match self.state.get() {
+			BucketState::Deleted => &[],
+			BucketState::Present(ak) => ak.items(),
+		}
+	}
 }
 
 impl Entry<EmptyKey, String> for Bucket {
@@ -75,36 +65,12 @@ impl Entry<EmptyKey, String> for Bucket {
 	}
 
 	fn merge(&mut self, other: &Self) {
-		if other.timestamp > self.timestamp {
+		self.state.merge(&other.state);
-			*self = other.clone();
-			return;
-		}
-		if self.timestamp > other.timestamp || self.deleted {
-			return;
-		}
-
-		for ak in other.authorized_keys.iter() {
-			match self
-				.authorized_keys
-				.binary_search_by(|our_ak| our_ak.key_id.cmp(&ak.key_id))
-			{
-				Ok(i) => {
-					let our_ak = &mut self.authorized_keys[i];
-					if ak.timestamp > our_ak.timestamp {
-						*our_ak = ak.clone();
-					}
-				}
-				Err(i) => {
-					self.authorized_keys.insert(i, ak.clone());
-				}
-			}
-		}
 	}
 }
 
 pub struct BucketTable;
 
-
 #[async_trait]
 impl TableSchema for BucketTable {
 	type P = EmptyKey;
@@ -117,6 +83,35 @@ impl TableSchema for BucketTable {
 	}
 
 	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
-		filter.apply(entry.deleted)
+		filter.apply(entry.is_deleted())
+	}
+
+	fn try_migrate(bytes: &[u8]) -> Option<Self::E> {
+		let old = match rmp_serde::decode::from_read_ref::<_, prev::Bucket>(bytes) {
+			Ok(x) => x,
+			Err(_) => return None,
+		};
+		if old.deleted {
+			Some(Bucket {
+				name: old.name,
+				state: crdt::LWW::migrate_from_raw(old.timestamp, BucketState::Deleted),
+			})
+		} else {
+			let mut keys = crdt::LWWMap::new();
+			for ak in old.authorized_keys() {
+				keys.merge(&crdt::LWWMap::migrate_from_raw_item(
+					ak.key_id.clone(),
+					ak.timestamp,
+					PermissionSet {
+						allow_read: ak.allow_read,
+						allow_write: ak.allow_write,
+					},
+				));
+			}
+			Some(Bucket {
+				name: old.name,
+				state: crdt::LWW::migrate_from_raw(old.timestamp, BucketState::Present(keys)),
+			})
+		}
 	}
 }

src/model/key_table.rs

@@ -1,8 +1,8 @@
 use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 
-use garage_table::*;
 use garage_table::crdt::CRDT;
+use garage_table::*;
 
 use garage_util::error::Error;
 
@@ -24,7 +24,6 @@ pub struct Key {
 
 	// Authorized keys
 	pub authorized_buckets: crdt::LWWMap<String, PermissionSet>,
-
 	// CRDT interaction: deleted implies authorized_buckets is empty
 }
 
@@ -128,7 +127,8 @@ impl TableSchema for KeyTable {
 				PermissionSet {
 					allow_read: ab.allow_read,
 					allow_write: ab.allow_write,
-				});
+				},
+			);
 			new.authorized_buckets.merge(&it);
 		}
 		Some(new)

src/table/crdt.rs

@@ -7,7 +7,9 @@ pub trait CRDT {
 }
 
 impl<T> CRDT for T
-where T: Ord + Clone {
+where
+	T: Ord + Clone,
+{
 	fn merge(&mut self, other: &Self) {
 		if other > self {
 			*self = other.clone();
@@ -18,14 +20,14 @@ where T: Ord + Clone {
 // ---- LWW Register ----
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
-pub struct LWW<T>
+pub struct LWW<T> {
-{
 	ts: u64,
 	v: T,
 }
 
 impl<T> LWW<T>
-where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord
+where
+	T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + CRDT,
 {
 	pub fn new(value: T) -> Self {
 		Self {
@@ -34,10 +36,7 @@ where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Part
 		}
 	}
 	pub fn migrate_from_raw(ts: u64, value: T) -> Self {
-		Self {
+		Self { ts, v: value }
-			ts,
-			v: value,
-		}
 	}
 	pub fn update(&mut self, new_value: T) {
 		self.ts = std::cmp::max(self.ts + 1, now_msec());
@@ -46,10 +45,14 @@ where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Part
 	pub fn get(&self) -> &T {
 		&self.v
 	}
+	pub fn get_mut(&mut self) -> &mut T {
+		&mut self.v
+	}
 }
 
 impl<T> CRDT for LWW<T>
-where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + CRDT
+where
+	T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + CRDT,
 {
 	fn merge(&mut self, other: &Self) {
 		if other.ts > self.ts {
@@ -61,7 +64,6 @@ where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Part
 	}
 }
 
-
 // ---- Boolean (true as absorbing state) ----
 
 #[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq)]
@@ -85,23 +87,20 @@ impl CRDT for Bool {
 	}
 }
 
-
 // ---- LWW Map ----
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
-pub struct LWWMap<K, V>
+pub struct LWWMap<K, V> {
-{
 	vals: Vec<(K, u64, V)>,
 }
 
 impl<K, V> LWWMap<K, V>
-where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord,
+where
+	K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord,
 	V: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord,
 {
 	pub fn new() -> Self {
-		Self{
+		Self { vals: vec![] }
-			vals: vec![],
-		}
 	}
 	pub fn migrate_from_raw_item(k: K, ts: u64, v: V) -> Self {
 		Self {
@@ -116,30 +115,20 @@ where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Part
 		self.vals.clear();
 	}
 	pub fn update_mutator(&self, k: K, new_v: V) -> Self {
-		let new_vals = match self
+		let new_vals = match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(&k)) {
-			.vals
-			.binary_search_by(|(k2, _, _)| k2.cmp(&k))
-		{
 			Ok(i) => {
 				let (_, old_ts, _) = self.vals[i];
 				let new_ts = std::cmp::max(old_ts + 1, now_msec());
 				vec![(k, new_ts, new_v)]
 			}
-			Err(_) => {
+			Err(_) => vec![(k, now_msec(), new_v)],
-				vec![(k, now_msec(), new_v)]
-			}
 		};
-		Self{
+		Self { vals: new_vals }
-			vals: new_vals,
-		}
 	}
 	pub fn get(&self, k: &K) -> Option<&V> {
-		match self
+		match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(&k)) {
-			.vals
-			.binary_search_by(|(k2, _, _)| k2.cmp(&k))
-		{
 			Ok(i) => Some(&self.vals[i].2),
-			Err(_) => None
+			Err(_) => None,
 		}
 	}
 	pub fn items(&self) -> &[(K, u64, V)] {
@@ -148,17 +137,15 @@ where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Part
 }
 
 impl<K, V> CRDT for LWWMap<K, V>
-where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Ord,
+where
+	K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Ord,
 	V: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + CRDT,
 {
 	fn merge(&mut self, other: &Self) {
 		for (k, ts2, v2) in other.vals.iter() {
-			match self
+			match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(&k)) {
-				.vals
-				.binary_search_by(|(k2, _, _)| k2.cmp(&k))
-			{
 				Ok(i) => {
-					let (_, ts1, v1) = &self.vals[i];
+					let (_, ts1, _v1) = &self.vals[i];
 					if ts2 > ts1 {
 						self.vals[i].1 = *ts2;
 						self.vals[i].2 = v2.clone();

src/table/lib.rs

@@ -3,9 +3,9 @@
 #[macro_use]
 extern crate log;
 
+pub mod crdt;
 pub mod schema;
 pub mod util;
-pub mod crdt;
 
 pub mod table;
 pub mod table_fullcopy;
@@ -13,5 +13,5 @@ pub mod table_sharded;
 pub mod table_sync;
 
 pub use schema::*;
-pub use util::*;
 pub use table::*;
+pub use util::*;

src/table/schema.rs

@@ -20,7 +20,6 @@ impl PartitionKey for Hash {
 	}
 }
 
-
 pub trait SortKey {
 	fn sort_key(&self) -> &[u8];
 }
@@ -37,7 +36,6 @@ impl SortKey for Hash {
 	}
 }
 
-
 pub trait Entry<P: PartitionKey, S: SortKey>:
 	PartialEq + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync
 {
@@ -47,7 +45,6 @@ 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;
@@ -66,4 +63,3 @@ pub trait TableSchema: Send + Sync {
 		true
 	}
 }
-