Sync: exposes ShareFlow<SyncResponse> from the SyncThread

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/Session.kt

@@ -18,6 +18,7 @@ package org.matrix.android.sdk.api.session
 
 import androidx.annotation.MainThread
 import androidx.lifecycle.LiveData
+import kotlinx.coroutines.flow.SharedFlow
 import okhttp3.OkHttpClient
 import org.matrix.android.sdk.api.auth.data.SessionParams
 import org.matrix.android.sdk.api.failure.GlobalError
@@ -57,6 +58,7 @@ import org.matrix.android.sdk.api.session.thirdparty.ThirdPartyService
 import org.matrix.android.sdk.api.session.typing.TypingUsersTracker
 import org.matrix.android.sdk.api.session.user.UserService
 import org.matrix.android.sdk.api.session.widgets.WidgetService
+import org.matrix.android.sdk.api.session.sync.model.SyncResponse
 
 /**
  * This interface defines interactions with a session.
@@ -143,6 +145,11 @@ interface Session :
      */
     fun getSyncState(): SyncState
 
+    /**
+     * This method returns a flow of SyncResponse. New value will be pushed through the sync thread.
+     */
+    fun syncFlow(): SharedFlow<SyncResponse>
+
     /**
      * This methods return true if an initial sync has been processed
      */

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/DefaultSession.kt

@@ -223,6 +223,8 @@ internal class DefaultSession @Inject constructor(
 
     override fun getSyncStateLive() = getSyncThread().liveState()
 
+    override fun syncFlow() = getSyncThread().syncFlow()
+
     override fun getSyncState() = getSyncThread().currentState()
 
     override fun hasAlreadySynced(): Boolean {

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/sync/SyncTask.kt

@@ -41,7 +41,7 @@ import java.io.File
 import java.net.SocketTimeoutException
 import javax.inject.Inject
 
-internal interface SyncTask : Task<SyncTask.Params, Unit> {
+internal interface SyncTask : Task<SyncTask.Params, SyncResponse> {
 
     data class Params(
             val timeout: Long,
@@ -69,13 +69,13 @@ internal class DefaultSyncTask @Inject constructor(
     private val workingDir = File(fileDirectory, "is")
     private val initialSyncStatusRepository: InitialSyncStatusRepository = FileInitialSyncStatusRepository(workingDir)
 
-    override suspend fun execute(params: SyncTask.Params) {
-        syncTaskSequencer.post {
+    override suspend fun execute(params: SyncTask.Params) : SyncResponse {
+        return syncTaskSequencer.post {
             doSync(params)
         }
     }
 
-    private suspend fun doSync(params: SyncTask.Params) {
+    private suspend fun doSync(params: SyncTask.Params): SyncResponse {
         Timber.v("Sync task started on Thread: ${Thread.currentThread().name}")
 
         val requestParams = HashMap<String, String>()
@@ -100,6 +100,7 @@ internal class DefaultSyncTask @Inject constructor(
 
         val readTimeOut = (params.timeout + TIMEOUT_MARGIN).coerceAtLeast(TimeOutInterceptor.DEFAULT_LONG_TIMEOUT)
 
+        var syncResponseToReturn: SyncResponse? = null
         if (isInitialSync) {
             Timber.d("INIT_SYNC with filter: ${requestParams["filter"]}")
             val initSyncStrategy = initialSyncStrategy
@@ -108,7 +109,7 @@ internal class DefaultSyncTask @Inject constructor(
                     roomSyncEphemeralTemporaryStore.reset()
                     workingDir.mkdirs()
                     val file = downloadInitSyncResponse(requestParams)
-                    reportSubtask(initialSyncProgressService, InitSyncStep.ImportingAccount, 1, 0.7F) {
+                    syncResponseToReturn = reportSubtask(initialSyncProgressService, InitSyncStep.ImportingAccount, 1, 0.7F) {
                         handleSyncFile(file, initSyncStrategy)
                     }
                     // Delete all files
@@ -122,10 +123,10 @@ internal class DefaultSyncTask @Inject constructor(
                             )
                         }
                     }
-
                     logDuration("INIT_SYNC Database insertion") {
                         syncResponseHandler.handleResponse(syncResponse, token, initialSyncProgressService)
                     }
+                    syncResponseToReturn = syncResponse
                 }
             }
             initialSyncProgressService.endAll()
@@ -137,8 +138,11 @@ internal class DefaultSyncTask @Inject constructor(
                 )
             }
             syncResponseHandler.handleResponse(syncResponse, token, null)
+            syncResponseToReturn = syncResponse
         }
         Timber.v("Sync task finished on Thread: ${Thread.currentThread().name}")
+        // Should throw if null as it's a mandatory value.
+        return syncResponseToReturn!!
     }
 
     private suspend fun downloadInitSyncResponse(requestParams: Map<String, String>): File {
@@ -195,8 +199,8 @@ internal class DefaultSyncTask @Inject constructor(
         }
     }
 
-    private suspend fun handleSyncFile(workingFile: File, initSyncStrategy: InitialSyncStrategy.Optimized) {
-        logDuration("INIT_SYNC handleSyncFile()") {
+    private suspend fun handleSyncFile(workingFile: File, initSyncStrategy: InitialSyncStrategy.Optimized): SyncResponse {
+        return logDuration("INIT_SYNC handleSyncFile()") {
             val syncResponse = logDuration("INIT_SYNC Read file and parse") {
                 syncResponseParser.parse(initSyncStrategy, workingFile)
             }
@@ -210,6 +214,7 @@ internal class DefaultSyncTask @Inject constructor(
                 syncResponseHandler.handleResponse(syncResponse, null, initialSyncProgressService)
             }
             initialSyncStatusRepository.setStep(InitialSyncStatus.STEP_SUCCESS)
+            syncResponse
         }
     }
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/sync/job/SyncThread.kt

@@ -34,11 +34,14 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancelChildren
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import org.matrix.android.sdk.api.session.call.MxCall
 import org.matrix.android.sdk.internal.session.call.ActiveCallHandler
 import org.matrix.android.sdk.internal.session.sync.SyncPresence
+import org.matrix.android.sdk.api.session.sync.model.SyncResponse
 import timber.log.Timber
 import java.net.SocketTimeoutException
 import java.util.Timer
@@ -72,6 +75,8 @@ internal class SyncThread @Inject constructor(private val syncTask: SyncTask,
         }
     }
 
+    private val _syncFlow = MutableSharedFlow<SyncResponse>()
+
     init {
         updateStateTo(SyncState.Idle)
     }
@@ -115,6 +120,8 @@ internal class SyncThread @Inject constructor(private val syncTask: SyncTask,
         return liveState
     }
 
+    fun syncFlow(): SharedFlow<SyncResponse> = _syncFlow
+
     override fun onConnectivityChanged() {
         retryNoNetworkTask?.cancel()
         synchronized(lock) {
@@ -192,7 +199,8 @@ internal class SyncThread @Inject constructor(private val syncTask: SyncTask,
 
     private suspend fun doSync(params: SyncTask.Params) {
         try {
-            syncTask.execute(params)
+            val syncResponse = syncTask.execute(params)
+            _syncFlow.emit(syncResponse)
         } catch (failure: Throwable) {
             if (failure is Failure.NetworkConnection) {
                 canReachServer = false