SyncManager: Switch to coroutines

android/gradle.properties

@@ -6,7 +6,8 @@ TARGET_SDK_VERSION = 29
 COMPILE_SDK_VERSION = 29
 
 DAGGER_VERSION = 2.25.4
-KOTLIN_VERSION = 1.3.61
+KOTLIN_VERSION = 1.4.0
+KX_COROUTINES_VERSION = 1.4.2
 SUPPORT_LIBRARY_VERSION = 28.0.0
 AUTO_FACTORY_VERSION = 1.0-beta6
 BUILD_TOOLS_VERSION = 4.0.0

android/uhabits-android/build.gradle

@@ -92,6 +92,8 @@ dependencies {
     implementation "com.google.code.gson:gson:2.8.5"
     implementation "com.google.code.findbugs:jsr305:3.0.2"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$KOTLIN_VERSION"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$KX_COROUTINES_VERSION"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$KX_COROUTINES_VERSION"
     implementation "androidx.constraintlayout:constraintlayout:2.0.0-beta4"
     implementation 'com.google.zxing:core:3.4.1'
     implementation "io.ktor:ktor-client-core:$KTOR_VERSION"

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/list/ListHabitsActivity.kt

@@ -20,6 +20,7 @@
 package org.isoron.uhabits.activities.habits.list
 
 import android.os.*
+import kotlinx.coroutines.*
 import org.isoron.uhabits.*
 import org.isoron.uhabits.activities.*
 import org.isoron.uhabits.activities.habits.list.views.*
@@ -40,6 +41,7 @@ class ListHabitsActivity : HabitsActivity() {
     lateinit var prefs: Preferences
     lateinit var midnightTimer: MidnightTimer
     lateinit var syncManager: SyncManager
+    private val scope = CoroutineScope(Dispatchers.Main)
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -61,7 +63,9 @@ class ListHabitsActivity : HabitsActivity() {
         midnightTimer.onPause()
         screen.onDettached()
         adapter.cancelRefresh()
+        scope.launch {
             syncManager.onPause()
+        }
         super.onPause()
     }
 
@@ -70,7 +74,9 @@ class ListHabitsActivity : HabitsActivity() {
         screen.onAttached()
         rootView.postInvalidate()
         midnightTimer.onResume()
+        scope.launch {
             syncManager.onResume()
+        }
         taskRunner.run {
             AutoBackup(this@ListHabitsActivity).run()
         }

android/uhabits-android/src/main/java/org/isoron/uhabits/sync/RemoteSyncServer.kt

@@ -24,6 +24,7 @@ import io.ktor.client.engine.android.*
 import io.ktor.client.features.*
 import io.ktor.client.features.json.*
 import io.ktor.client.request.*
+import kotlinx.coroutines.*
 
 data class RegisterReponse(val key: String)
 data class GetDataVersionResponse(val version: Long)
@@ -35,16 +36,16 @@ class RemoteSyncServer(
         }
 ) : AbstractSyncServer {
 
-    override suspend fun register(): String {
+    override suspend fun register(): String = Dispatchers.IO {
         try {
             val response: RegisterReponse = httpClient.post("$baseURL/register")
-            return response.key
+            return@IO response.key
         } catch(e: ServerResponseException) {
             throw ServiceUnavailable()
         }
     }
 
-    override suspend fun put(key: String, newData: SyncData) {
+    override suspend fun put(key: String, newData: SyncData) = Dispatchers.IO {
         try {
             val response: String = httpClient.put("$baseURL/db/$key") {
                 header("Content-Type", "application/json")
@@ -57,9 +58,10 @@ class RemoteSyncServer(
         }
     }
 
-    override suspend fun getData(key: String): SyncData {
+    override suspend fun getData(key: String): SyncData = Dispatchers.IO {
         try {
-            return httpClient.get("$baseURL/db/$key")
+            val data: SyncData = httpClient.get("$baseURL/db/$key")
+            return@IO data
         } catch (e: ServerResponseException) {
             throw ServiceUnavailable()
         } catch (e: ClientRequestException) {
@@ -67,10 +69,10 @@ class RemoteSyncServer(
         }
     }
 
-    override suspend fun getDataVersion(key: String): Long {
+    override suspend fun getDataVersion(key: String): Long = Dispatchers.IO {
         try {
             val response: GetDataVersionResponse = httpClient.get("$baseURL/db/$key/version")
-            return response.version
+            return@IO response.version
         } catch(e: ServerResponseException) {
             throw ServiceUnavailable()
         } catch (e: ClientRequestException) {

android/uhabits-android/src/main/java/org/isoron/uhabits/sync/SyncManager.kt

@@ -51,13 +51,11 @@ class SyncManager @Inject constructor(
         commandRunner.addListener(this)
     }
 
-    fun sync() {
-        if(!preferences.isSyncEnabled) {
+    suspend fun sync() {
+        if (!preferences.isSyncEnabled) {
             Log.i("SyncManager", "Device sync is disabled. Skipping sync")
             return
         }
-        taskRunner.execute {
-            runBlocking {
         try {
             Log.i("SyncManager", "Starting sync (key: ${preferences.syncKey})")
             fetchAndMerge()
@@ -69,13 +67,10 @@ class SyncManager @Inject constructor(
             preferences.syncKey = ""
             preferences.encryptionKey = ""
         }
-                return@runBlocking
-            }
-        }
     }
 
     suspend fun upload() {
-        if(!dirty) {
+        if (!dirty) {
             Log.i("SyncManager", "Database not dirty. Skipping upload.")
             return
         }
@@ -101,14 +96,19 @@ class SyncManager @Inject constructor(
         currVersion = data.version + 1
     }
 
-    fun onResume() {
+    suspend fun onResume() {
+        sync()
+    }
+
+    suspend fun onPause() {
         sync()
     }
 
-    fun onPause() {
+    override fun onSyncEnabled() {
+        CoroutineScope(Dispatchers.Main).launch {
             sync()
         }
-    override fun onSyncEnabled() = sync()
+    }
 
     override fun onCommandExecuted(command: Command?, refreshKey: Long?) {
         dirty = true