send queue: add an own transaction id for dependent events

The previously named `transaction_id` is also renamed to
`parent_transaction_id` to make it clearer.

crates/matrix-sdk-base/src/store/integration_tests.rs

@@ -1498,14 +1498,21 @@ impl StateStoreIntegrationTests for DynStateStore {
         assert!(self.list_dependent_send_queue_events(room_id).await.unwrap().is_empty());
 
         // Save a redaction for that event.
-        self.save_dependent_send_queue_event(room_id, &txn0, DependentQueuedEventKind::Redact)
-            .await
-            .unwrap();
+        let child_txn = TransactionId::new();
+        self.save_dependent_send_queue_event(
+            room_id,
+            &txn0,
+            child_txn.clone(),
+            DependentQueuedEventKind::Redact,
+        )
+        .await
+        .unwrap();
 
         // It worked.
         let dependents = self.list_dependent_send_queue_events(room_id).await.unwrap();
         assert_eq!(dependents.len(), 1);
-        assert_eq!(dependents[0].transaction_id, txn0);
+        assert_eq!(dependents[0].parent_transaction_id, txn0);
+        assert_eq!(dependents[0].own_transaction_id, child_txn);
         assert!(dependents[0].event_id.is_none());
         assert_matches!(dependents[0].kind, DependentQueuedEventKind::Redact);
 
@@ -1518,13 +1525,16 @@ impl StateStoreIntegrationTests for DynStateStore {
         // It worked.
         let dependents = self.list_dependent_send_queue_events(room_id).await.unwrap();
         assert_eq!(dependents.len(), 1);
-        assert_eq!(dependents[0].transaction_id, txn0);
+        assert_eq!(dependents[0].parent_transaction_id, txn0);
+        assert_eq!(dependents[0].own_transaction_id, child_txn);
         assert_eq!(dependents[0].event_id.as_ref(), Some(&event_id));
         assert_matches!(dependents[0].kind, DependentQueuedEventKind::Redact);
 
         // Now remove it.
-        let removed =
-            self.remove_dependent_send_queue_event(room_id, dependents[0].id).await.unwrap();
+        let removed = self
+            .remove_dependent_send_queue_event(room_id, &dependents[0].own_transaction_id)
+            .await
+            .unwrap();
         assert!(removed);
 
         // It worked.
@@ -1538,14 +1548,20 @@ impl StateStoreIntegrationTests for DynStateStore {
                 .unwrap();
         self.save_send_queue_event(room_id, txn1.clone(), event1).await.unwrap();
 
-        self.save_dependent_send_queue_event(room_id, &txn0, DependentQueuedEventKind::Redact)
-            .await
-            .unwrap();
+        self.save_dependent_send_queue_event(
+            room_id,
+            &txn0,
+            TransactionId::new(),
+            DependentQueuedEventKind::Redact,
+        )
+        .await
+        .unwrap();
         assert_eq!(self.list_dependent_send_queue_events(room_id).await.unwrap().len(), 1);
 
         self.save_dependent_send_queue_event(
             room_id,
             &txn1,
+            TransactionId::new(),
             DependentQueuedEventKind::Edit {
                 new_content: SerializableEventContent::new(
                     &RoomMessageEventContent::text_plain("edit").into(),

crates/matrix-sdk-base/src/store/memory_store.rs

@@ -15,7 +15,7 @@
 use std::{
     collections::{BTreeMap, BTreeSet, HashMap},
     num::NonZeroUsize,
-    sync::{Mutex, RwLock as StdRwLock},
+    sync::RwLock as StdRwLock,
 };
 
 use async_trait::async_trait;
@@ -92,7 +92,6 @@ pub struct MemoryStore {
     custom: StdRwLock<HashMap<Vec<u8>, Vec<u8>>>,
     send_queue_events: StdRwLock<BTreeMap<OwnedRoomId, Vec<QueuedEvent>>>,
     dependent_send_queue_events: StdRwLock<BTreeMap<OwnedRoomId, Vec<DependentQueuedEvent>>>,
-    dependent_send_queue_event_next_id: Mutex<usize>,
 }
 
 // SAFETY: `new_unchecked` is safe because 20 is not zero.
@@ -124,7 +123,6 @@ impl Default for MemoryStore {
             custom: Default::default(),
             send_queue_events: Default::default(),
             dependent_send_queue_events: Default::default(),
-            dependent_send_queue_event_next_id: Mutex::new(0),
         }
     }
 }
@@ -1005,39 +1003,31 @@ impl StateStore for MemoryStore {
     async fn save_dependent_send_queue_event(
         &self,
         room: &RoomId,
-        transaction_id: &TransactionId,
+        parent_transaction_id: &TransactionId,
+        own_transaction_id: OwnedTransactionId,
         content: DependentQueuedEventKind,
     ) -> Result<(), Self::Error> {
-        let id = {
-            let mut next_id = self.dependent_send_queue_event_next_id.lock().unwrap();
-            // Don't tell anyone, but sometimes I miss C++'s `x++` operator.
-            let id = *next_id;
-            *next_id += 1;
-            id
-        };
-
         self.dependent_send_queue_events.write().unwrap().entry(room.to_owned()).or_default().push(
             DependentQueuedEvent {
-                id,
                 kind: content,
-                transaction_id: transaction_id.to_owned(),
+                parent_transaction_id: parent_transaction_id.to_owned(),
+                own_transaction_id,
                 event_id: None,
             },
         );
-
         Ok(())
     }
 
     async fn update_dependent_send_queue_event(
         &self,
         room: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
         event_id: OwnedEventId,
     ) -> Result<usize, Self::Error> {
         let mut dependent_send_queue_events = self.dependent_send_queue_events.write().unwrap();
         let dependents = dependent_send_queue_events.entry(room.to_owned()).or_default();
         let mut num_updated = 0;
-        for d in dependents.iter_mut().filter(|item| item.transaction_id == transaction_id) {
+        for d in dependents.iter_mut().filter(|item| item.parent_transaction_id == parent_txn_id) {
             d.event_id = Some(event_id.clone());
             num_updated += 1;
         }
@@ -1047,11 +1037,11 @@ impl StateStore for MemoryStore {
     async fn remove_dependent_send_queue_event(
         &self,
         room: &RoomId,
-        id: usize,
+        txn_id: &TransactionId,
     ) -> Result<bool, Self::Error> {
         let mut dependent_send_queue_events = self.dependent_send_queue_events.write().unwrap();
         let dependents = dependent_send_queue_events.entry(room.to_owned()).or_default();
-        if let Some(pos) = dependents.iter().position(|item| item.id == id) {
+        if let Some(pos) = dependents.iter().position(|item| item.own_transaction_id == txn_id) {
             dependents.remove(pos);
             Ok(true)
         } else {

crates/matrix-sdk-base/src/store/traits.rs

@@ -459,7 +459,8 @@ pub trait StateStore: AsyncTraitDeps {
     async fn save_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
+        own_txn_id: OwnedTransactionId,
         content: DependentQueuedEventKind,
     ) -> Result<(), Self::Error>;
 
@@ -470,7 +471,7 @@ pub trait StateStore: AsyncTraitDeps {
     async fn update_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
         event_id: OwnedEventId,
     ) -> Result<usize, Self::Error>;
 
@@ -480,7 +481,7 @@ pub trait StateStore: AsyncTraitDeps {
     async fn remove_dependent_send_queue_event(
         &self,
         room: &RoomId,
-        id: usize,
+        own_txn_id: &TransactionId,
     ) -> Result<bool, Self::Error>;
 
     /// List all the dependent send queue events.
@@ -767,33 +768,34 @@ impl<T: StateStore> StateStore for EraseStateStoreError<T> {
     async fn save_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
+        own_txn_id: OwnedTransactionId,
         content: DependentQueuedEventKind,
     ) -> Result<(), Self::Error> {
         self.0
-            .save_dependent_send_queue_event(room_id, transaction_id, content)
+            .save_dependent_send_queue_event(room_id, parent_txn_id, own_txn_id, content)
             .await
             .map_err(Into::into)
     }
 
     async fn update_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
         event_id: OwnedEventId,
     ) -> Result<usize, Self::Error> {
         self.0
-            .update_dependent_send_queue_event(room_id, transaction_id, event_id)
+            .update_dependent_send_queue_event(room_id, parent_txn_id, event_id)
             .await
             .map_err(Into::into)
     }
 
     async fn remove_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        id: usize,
+        own_txn_id: &TransactionId,
     ) -> Result<bool, Self::Error> {
-        self.0.remove_dependent_send_queue_event(room_id, id).await.map_err(Into::into)
+        self.0.remove_dependent_send_queue_event(room_id, own_txn_id).await.map_err(Into::into)
     }
 
     async fn list_dependent_send_queue_events(
@@ -1262,7 +1264,7 @@ pub struct DependentQueuedEvent {
     /// Unique identifier for this dependent queued event.
     ///
     /// Useful for deletion.
-    pub id: usize,
+    pub own_transaction_id: OwnedTransactionId,
 
     /// The kind of user intent.
     pub kind: DependentQueuedEventKind,
@@ -1272,7 +1274,7 @@ pub struct DependentQueuedEvent {
     /// Note: this is the transaction id used for the depended-on event, i.e.
     /// the one that was originally sent and that's being modified with this
     /// dependent event.
-    pub transaction_id: OwnedTransactionId,
+    pub parent_transaction_id: OwnedTransactionId,
 
     /// If the parent event has been sent, the parent's event identifier
     /// returned by the server once the local echo has been sent out.

crates/matrix-sdk-indexeddb/src/state_store/mod.rs

@@ -1575,7 +1575,8 @@ impl_state_store!({
     async fn save_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
+        own_txn_id: OwnedTransactionId,
         content: DependentQueuedEventKind,
     ) -> Result<()> {
         let encoded_key = self.encode_key(keys::DEPENDENT_SEND_QUEUE, room_id);
@@ -1596,14 +1597,11 @@ impl_state_store!({
             |val| self.deserialize_value::<Vec<DependentQueuedEvent>>(&val),
         )?;
 
-        // Find the next id by taking the biggest ID we had before, and add 1.
-        let next_id = prev.iter().fold(0, |max, item| item.id.max(max)) + 1;
-
         // Push the new event.
         prev.push(DependentQueuedEvent {
-            id: next_id,
             kind: content,
-            transaction_id: transaction_id.to_owned(),
+            parent_transaction_id: parent_txn_id.to_owned(),
+            own_transaction_id: own_txn_id,
             event_id: None,
         });
 
@@ -1618,7 +1616,7 @@ impl_state_store!({
     async fn update_dependent_send_queue_event(
         &self,
         room_id: &RoomId,
-        transaction_id: &TransactionId,
+        parent_txn_id: &TransactionId,
         event_id: OwnedEventId,
     ) -> Result<usize> {
         let encoded_key = self.encode_key(keys::DEPENDENT_SEND_QUEUE, room_id);
@@ -1641,7 +1639,7 @@ impl_state_store!({
 
         // Modify all events that match.
         let mut num_updated = 0;
-        for entry in prev.iter_mut().filter(|entry| entry.transaction_id == transaction_id) {
+        for entry in prev.iter_mut().filter(|entry| entry.parent_transaction_id == parent_txn_id) {
             entry.event_id = Some(event_id.clone());
             num_updated += 1;
         }
@@ -1654,7 +1652,11 @@ impl_state_store!({
         Ok(num_updated)
     }
 
-    async fn remove_dependent_send_queue_event(&self, room_id: &RoomId, id: usize) -> Result<bool> {
+    async fn remove_dependent_send_queue_event(
+        &self,
+        room_id: &RoomId,
+        txn_id: &TransactionId,
+    ) -> Result<bool> {
         let encoded_key = self.encode_key(keys::DEPENDENT_SEND_QUEUE, room_id);
 
         let tx = self.inner.transaction_on_one_with_mode(
@@ -1668,7 +1670,7 @@ impl_state_store!({
         // Reload the previous vector for this room.
         if let Some(val) = obj.get(&encoded_key)?.await? {
             let mut prev = self.deserialize_value::<Vec<DependentQueuedEvent>>(&val)?;
-            if let Some(pos) = prev.iter().position(|item| item.id == id) {
+            if let Some(pos) = prev.iter().position(|item| item.own_transaction_id == txn_id) {
                 prev.remove(pos);
 
                 if prev.is_empty() {

crates/matrix-sdk-sqlite/migrations/state_store/005_send_queue_dependent_events.sql

@@ -4,7 +4,12 @@ CREATE TABLE "dependent_send_queue_events" (
     "room_id" BLOB NOT NULL,
 
     -- This is used as both a key and a value, thus neither encrypted/decrypted/hashed.
-    "transaction_id" BLOB NOT NULL,
+    -- This is the transaction id for the *parent* transaction, not our own.
+    "parent_transaction_id" BLOB NOT NULL,
+
+    -- This is used as both a key and a value, thus neither encrypted/decrypted/hashed.
+    -- This is a transaction id used for the dependent event itself, not the parent.
+    "own_transaction_id" BLOB NOT NULL,
 
     -- Used as a value (thus encrypted/decrypted), can be null.
     "event_id" BLOB NULL,