fix backup looping same keys

changelog.d/6585.bugfix

@@ -0,0 +1 @@
+Fix backup saving several times the same keys

matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/internal/crypto/keysbackup/KeysBackupTest.kt

@@ -24,7 +24,6 @@ import org.junit.Assert.assertNotNull
 import org.junit.Assert.assertNull
 import org.junit.Assert.assertTrue
 import org.junit.FixMethodOrder
-import org.junit.Ignore
 import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
@@ -56,7 +55,6 @@ import java.util.concurrent.CountDownLatch
 @RunWith(AndroidJUnit4::class)
 @FixMethodOrder(MethodSorters.JVM)
 @LargeTest
-@Ignore
 class KeysBackupTest : InstrumentedTest {
 
     @get:Rule val rule = RetryTestRule(3)

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/InboundGroupSessionStore.kt

@@ -21,13 +21,10 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import org.matrix.android.sdk.api.MatrixCoroutineDispatchers
-import org.matrix.android.sdk.api.extensions.tryOrNull
 import org.matrix.android.sdk.api.logger.LoggerTag
 import org.matrix.android.sdk.internal.crypto.model.MXInboundMegolmSessionWrapper
 import org.matrix.android.sdk.internal.crypto.store.IMXCryptoStore
 import timber.log.Timber
-import java.util.Timer
-import java.util.TimerTask
 import javax.inject.Inject
 
 internal data class InboundGroupSessionHolder(
@@ -57,18 +54,13 @@ internal class InboundGroupSessionStore @Inject constructor(
             if (oldValue != null) {
                 cryptoCoroutineScope.launch(coroutineDispatchers.crypto) {
                     Timber.tag(loggerTag.value).v("## Inbound: entryRemoved ${oldValue.wrapper.roomId}-${oldValue.wrapper.senderKey}")
-                    store.storeInboundGroupSessions(listOf(oldValue).map { it.wrapper })
+                    // store.storeInboundGroupSessions(listOf(oldValue).map { it.wrapper })
                     oldValue.wrapper.session.releaseSession()
                 }
             }
         }
     }
 
-    private val timer = Timer()
-    private var timerTask: TimerTask? = null
-
-    private val dirtySession = mutableListOf<InboundGroupSessionHolder>()
-
     @Synchronized
     fun clear() {
         sessionCache.evictAll()
@@ -90,7 +82,6 @@ internal class InboundGroupSessionStore @Inject constructor(
     @Synchronized
     fun replaceGroupSession(old: InboundGroupSessionHolder, new: InboundGroupSessionHolder, sessionId: String, senderKey: String) {
         Timber.tag(loggerTag.value).v("## Replacing outdated session ${old.wrapper.roomId}-${old.wrapper.senderKey}")
-        dirtySession.remove(old)
         store.removeInboundGroupSession(sessionId, senderKey)
         sessionCache.remove(CacheKey(sessionId, senderKey))
 
@@ -107,33 +98,14 @@ internal class InboundGroupSessionStore @Inject constructor(
 
     private fun internalStoreGroupSession(holder: InboundGroupSessionHolder, sessionId: String, senderKey: String) {
         Timber.tag(loggerTag.value).v("## Inbound: getInboundGroupSession mark as dirty ${holder.wrapper.roomId}-${holder.wrapper.senderKey}")
-        // We want to batch this a bit for performances
-        dirtySession.add(holder)
 
         if (sessionCache[CacheKey(sessionId, senderKey)] == null) {
             // first time seen, put it in memory cache while waiting for batch insert
             // If it's already known, no need to update cache it's already there
             sessionCache.put(CacheKey(sessionId, senderKey), holder)
         }
-
-        timerTask?.cancel()
-        timerTask = object : TimerTask() {
-            override fun run() {
-                batchSave()
-            }
-        }
-        timer.schedule(timerTask!!, 300)
-    }
-
-    @Synchronized
-    private fun batchSave() {
-        val toSave = mutableListOf<InboundGroupSessionHolder>().apply { addAll(dirtySession) }
-        dirtySession.clear()
         cryptoCoroutineScope.launch(coroutineDispatchers.crypto) {
-            Timber.tag(loggerTag.value).v("## Inbound: getInboundGroupSession batching save of ${toSave.size}")
-            tryOrNull {
-                store.storeInboundGroupSessions(toSave.map { it.wrapper })
-            }
+            store.storeInboundGroupSessions(listOf(holder.wrapper))
         }
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/MXOlmDevice.kt

@@ -806,7 +806,6 @@ internal class MXOlmDevice @Inject constructor(
             }
             replayAttackMap[messageIndexKey] = eventId
         }
-        inboundGroupSessionStore.storeInBoundGroupSession(sessionHolder, sessionId, senderKey)
         val payload = try {
             val adapter = MoshiProvider.providesMoshi().adapter<JsonDict>(JSON_DICT_PARAMETERIZED_TYPE)
             val payloadString = convertFromUTF8(decryptResult.mDecryptedMessage)

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/keysbackup/DefaultKeysBackupService.kt

@@ -1349,6 +1349,8 @@ internal class DefaultKeysBackupService @Inject constructor(
 
                                         // Mark keys as backed up
                                         cryptoStore.markBackupDoneForInboundGroupSessions(olmInboundGroupSessionWrappers)
+                                        // we can release the sessions now
+                                        olmInboundGroupSessionWrappers.onEach { it.session.releaseSession() }
 
                                         if (olmInboundGroupSessionWrappers.size < KEY_BACKUP_SEND_KEYS_MAX_COUNT) {
                                             Timber.v("backupKeys: All keys have been backed up")

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/store/db/RealmCryptoStore.kt

@@ -763,11 +763,17 @@ internal class RealmCryptoStore @Inject constructor(
 //                    } ?: false
                 val key = OlmInboundGroupSessionEntity.createPrimaryKey(sessionIdentifier, wrapper.sessionData.senderKey)
 
+                val existing = realm.where<OlmInboundGroupSessionEntity>()
+                        .equalTo(OlmInboundGroupSessionEntityFields.PRIMARY_KEY, key)
+                        .findFirst()
+
                 val realmOlmInboundGroupSession = OlmInboundGroupSessionEntity().apply {
                     primaryKey = key
                     store(wrapper)
+                    backedUp = existing?.backedUp ?: false
                 }
-                Timber.i("## CRYPTO | shouldShareHistory: ${wrapper.sessionData.sharedHistory} for $key")
+
+                Timber.v("## CRYPTO | shouldShareHistory: ${wrapper.sessionData.sharedHistory} for $key")
                 realm.insertOrUpdate(realmOlmInboundGroupSession)
             }
         }