desktop: saving settings in a safer way to handle process death (#4687)

* desktop: saving settings in a safer way to handle process death

* enhancements

* unused

* changes

* rename

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/Files.android.kt

@@ -19,6 +19,8 @@ actual val wallpapersDir: File = File(filesDir.absolutePath + File.separator + "
 actual val coreTmpDir: File = File(filesDir.absolutePath + File.separator + "temp_files")
 actual val dbAbsolutePrefixPath: String = dataDir.absolutePath + File.separator + "files"
 actual val preferencesDir = File(dataDir.absolutePath + File.separator + "shared_prefs")
+actual val preferencesTmpDir = File(tmpDir, "prefs_tmp")
+  .also { it.deleteRecursively() }
 
 actual val chatDatabaseFileName: String = "files_chat.db"
 actual val agentDatabaseFileName: String = "files_agent.db"

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt

@@ -3168,8 +3168,12 @@ class SharedPreference<T>(val get: () -> T, set: (T) -> Unit) {
 
   init {
     this.set = { value ->
-      set(value)
-      _state.value = value
+      try {
+        set(value)
+        _state.value = value
+      } catch (e: Exception) {
+        Log.e(TAG, "Error saving settings: ${e.stackTraceToString()}")
+      }
     }
   }
 }

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/platform/Files.kt

@@ -3,7 +3,7 @@ package chat.simplex.common.platform
 import androidx.compose.runtime.Composable
 import chat.simplex.common.model.*
 import chat.simplex.common.ui.theme.*
-import chat.simplex.common.views.helpers.generalGetString
+import chat.simplex.common.views.helpers.*
 import chat.simplex.res.MR
 import com.charleskorn.kaml.*
 import kotlinx.serialization.encodeToString
@@ -11,6 +11,8 @@ import java.io.*
 import java.net.URI
 import java.net.URLDecoder
 import java.net.URLEncoder
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
 
 expect val dataDir: File
 expect val tmpDir: File
@@ -20,6 +22,7 @@ expect val wallpapersDir: File
 expect val coreTmpDir: File
 expect val dbAbsolutePrefixPath: String
 expect val preferencesDir: File
+expect val preferencesTmpDir: File
 
 expect val chatDatabaseFileName: String
 expect val agentDatabaseFileName: String
@@ -142,16 +145,23 @@ fun readThemeOverrides(): List<ThemeOverrides> {
   }
 }
 
+private const val lock = "themesWriter"
+
 fun writeThemeOverrides(overrides: List<ThemeOverrides>): Boolean =
-  try {
-    File(getPreferenceFilePath("themes.yaml")).outputStream().use {
-      val string = yaml.encodeToString(ThemesFile(themes = overrides))
-      it.bufferedWriter().use { it.write(string) }
+  synchronized(lock) {
+    try {
+      val themesFile = File(getPreferenceFilePath("themes.yaml"))
+      createTmpFileAndDelete(preferencesTmpDir) { tmpFile ->
+        val string = yaml.encodeToString(ThemesFile(themes = overrides))
+        tmpFile.bufferedWriter().use { it.write(string) }
+        themesFile.parentFile.mkdirs()
+        Files.move(tmpFile.toPath(), themesFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+      }
+      true
+    } catch (e: Exception) {
+      Log.e(TAG, "Error writing themes file: ${e.stackTraceToString()}")
+      false
     }
-    true
-  } catch (e: Throwable) {
-    Log.e(TAG, "Error while writing themes file: ${e.stackTraceToString()}")
-    false
   }
 
 private fun fileReady(file: CIFile, filePath: String) =

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/ui/theme/ThemeManager.kt

@@ -102,7 +102,9 @@ object ThemeManager {
   }
 
   fun applyTheme(theme: String) {
-    appPrefs.currentTheme.set(theme)
+    if (appPrefs.currentTheme.get() != theme) {
+      appPrefs.currentTheme.set(theme)
+    }
     CurrentColors.value = currentColors(null, null, chatModel.currentUser.value?.uiThemes, appPrefs.themeOverrides.get())
     platform.androidSetNightModeIfSupported()
     val c = CurrentColors.value.colors

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/helpers/Utils.kt

@@ -316,8 +316,9 @@ fun removeWallpaperFile(fileName: String? = null) {
   WallpaperType.cachedImages.remove(fileName)
 }
 
-fun <T> createTmpFileAndDelete(onCreated: (File) -> T): T {
-  val tmpFile = File(tmpDir, UUID.randomUUID().toString())
+fun <T> createTmpFileAndDelete(dir: File = tmpDir, onCreated: (File) -> T): T {
+  val tmpFile = File(dir, UUID.randomUUID().toString())
+  tmpFile.parentFile.mkdirs()
   tmpFile.deleteOnExit()
   ChatModel.filesToDelete.add(tmpFile)
   try {

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/onboarding/WhatsNewView.kt

@@ -16,6 +16,8 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.desktop.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import chat.simplex.common.model.ChatController.appPrefs
+import chat.simplex.common.model.ChatModel
 import chat.simplex.common.model.*
 import chat.simplex.common.model.ChatController.setConditionsNotified
 import chat.simplex.common.model.ServerOperator.Companion.dummyOperatorInfo
@@ -766,7 +768,9 @@ private val versionDescriptions: List<VersionDescription> = listOf(
 private val lastVersion = versionDescriptions.last().version
 
 fun setLastVersionDefault(m: ChatModel) {
-  m.controller.appPrefs.whatsNewVersion.set(lastVersion)
+  if (appPrefs.whatsNewVersion.get() != lastVersion) {
+    appPrefs.whatsNewVersion.set(lastVersion)
+  }
 }
 
 fun shouldShowWhatsNew(m: ChatModel): Boolean {

apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml

@@ -943,6 +943,7 @@
   <string name="show_slow_api_calls">Show slow API calls</string>
   <string name="shutdown_alert_question">Shutdown?</string>
   <string name="shutdown_alert_desc">Notifications will stop working until you re-launch the app</string>
+  <string name="prefs_error_saving_settings">Error saving settings</string>
 
   <!-- Address Items - UserAddressView.kt -->
   <string name="create_address">Create address</string>

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/platform/Files.desktop.kt

@@ -17,6 +17,8 @@ actual val wallpapersDir: File = File(dataDir.absolutePath + File.separator + "s
 actual val coreTmpDir: File = File(dataDir.absolutePath + File.separator + "tmp")
 actual val dbAbsolutePrefixPath: String = dataDir.absolutePath + File.separator + "simplex_v1"
 actual val preferencesDir = File(desktopPlatform.configPath).also { it.parentFile.mkdirs() }
+actual val preferencesTmpDir = File(desktopPlatform.configPath, "tmp")
+  .also { it.deleteRecursively() }
 
 actual val chatDatabaseFileName: String = "simplex_v1_chat.db"
 actual val agentDatabaseFileName: String = "simplex_v1_agent.db"

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/platform/Resources.desktop.kt

@@ -9,15 +9,16 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.*
 import chat.simplex.common.simplexWindowState
 import chat.simplex.common.views.helpers.*
+import chat.simplex.res.MR
 import com.jthemedetecor.OsThemeDetector
 import com.russhwolf.settings.*
 import dev.icerock.moko.resources.ImageResource
 import dev.icerock.moko.resources.StringResource
 import dev.icerock.moko.resources.desc.desc
-import kotlinx.coroutines.*
 import java.io.File
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
 import java.util.*
-import java.util.concurrent.Executors
 
 @Composable
 actual fun font(name: String, res: String, weight: FontWeight, style: FontStyle): Font =
@@ -37,10 +38,8 @@ catch (e: Exception) {
 
 private val settingsFile =
   File(desktopPlatform.configPath + File.separator + "settings.properties")
-    .also { it.parentFile.mkdirs() }
 private val settingsThemesFile =
   File(desktopPlatform.configPath + File.separator + "themes.properties")
-    .also { it.parentFile.mkdirs() }
 
 private val settingsProps =
   Properties()
@@ -61,11 +60,35 @@ private val settingsThemesProps =
   Properties()
     .also { props -> try { settingsThemesFile.reader().use { props.load(it) } } catch (e: Exception) { /**/ } }
 
-
-private val settingsWriterThread = Executors.newSingleThreadExecutor().asCoroutineDispatcher()
-
-actual val settings: Settings = PropertiesSettings(settingsProps) { CoroutineScope(settingsWriterThread).launch { settingsFile.writer().use { settingsProps.store(it, "") } } }
-actual val settingsThemes: Settings = PropertiesSettings(settingsThemesProps) { CoroutineScope(settingsWriterThread).launch { settingsThemesFile.writer().use { settingsThemesProps.store(it, "") } } }
+private const val lock = "settingsSaver"
+actual val settings: Settings = PropertiesSettings(settingsProps) {
+  synchronized(lock) {
+    try {
+      createTmpFileAndDelete(preferencesTmpDir) { tmpFile ->
+        tmpFile.writer().use { settingsProps.store(it, "") }
+        settingsFile.parentFile.mkdirs()
+        Files.move(tmpFile.toPath(), settingsFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+      }
+    } catch (e: Exception) {
+      AlertManager.shared.showAlertMsg(generalGetString(MR.strings.prefs_error_saving_settings), e.stackTraceToString())
+      throw e
+    }
+  }
+}
+actual val settingsThemes: Settings = PropertiesSettings(settingsThemesProps) {
+  synchronized(lock) {
+    try {
+      createTmpFileAndDelete(preferencesTmpDir) { tmpFile ->
+        tmpFile.writer().use { settingsThemesProps.store(it, "") }
+        settingsThemesFile.parentFile.mkdirs()
+        Files.move(tmpFile.toPath(), settingsThemesFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+      }
+    } catch (e: Exception) {
+      AlertManager.shared.showAlertMsg(generalGetString(MR.strings.prefs_error_saving_settings), e.stackTraceToString())
+      throw e
+    }
+  }
+}
 
 actual fun windowOrientation(): WindowOrientation =
   if (simplexWindowState.windowState.size.width > simplexWindowState.windowState.size.height) {