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Code Releases Activity

Fix leak in SyncthingService.StartupTask (fixes #1135)

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Catfriend1 2018-06-17 20:05:04 +02:00 committed by Audrius Butkevicius
parent 64e3684d04
commit 6122c8befa
1 changed files with 96 additions and 66 deletions
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162
app/src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java
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@ -24,6 +24,7 @@ import com.nutomic.syncthingandroid.util.ConfigXml;
import java.io.File;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.HashSet;
import java.util.Iterator;
@ -95,6 +96,7 @@ public class SyncthingService extends Service {
private @Nullable EventProcessor mEventProcessor = null;
private @Nullable DeviceStateHolder mDeviceStateHolder = null;
private @Nullable SyncthingRunnable mSyncthingRunnable = null;
private StartupTask mStartupTask = null;
private Thread mSyncthingRunnableThread = null;
private Handler mHandler;
@ -190,16 +192,16 @@ public class SyncthingService extends Service {
return START_STICKY;
if (ACTION_RESTART.equals(intent.getAction()) && mCurrentState == State.ACTIVE) {
shutdown(State.INIT, () -> new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR));
shutdown(State.INIT, () -> launchStartupTask());
} else if (ACTION_RESET_DATABASE.equals(intent.getAction())) {
shutdown(State.INIT, () -> {
new SyncthingRunnable(this, SyncthingRunnable.Command.resetdatabase).run();
new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
launchStartupTask();
});
} else if (ACTION_RESET_DELTAS.equals(intent.getAction())) {
shutdown(State.INIT, () -> {
new SyncthingRunnable(this, SyncthingRunnable.Command.resetdeltas).run();
new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
launchStartupTask();
});
} else if (ACTION_REFRESH_NETWORK_INFO.equals(intent.getAction())) {
mDeviceStateHolder.updateShouldRunDecision();
@ -227,8 +229,7 @@ public class SyncthingService extends Service {
// HACK: Make sure there is no syncthing binary left running from an improper
// shutdown (eg Play Store update).
shutdown(State.INIT, () -> {
Log.v(TAG, "Starting syncthing");
new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
launchStartupTask();
});
break;
case STARTING:
@ -249,81 +250,110 @@ public class SyncthingService extends Service {
}
}
/**
* Prepares to launch the syncthing binary.
*/
private void launchStartupTask () {
Log.v(TAG, "Starting syncthing");
synchronized(mStateLock) {
if (mCurrentState != State.INIT) {
Log.e(TAG, "launchStartupTask: Wrong state " + mCurrentState + " detected. Cancelling.");
return;
}
}
// Safety check: Log warning if a previously launched startup task did not finish properly.
if (mStartupTask != null && (mStartupTask.getStatus() == AsyncTask.Status.RUNNING)) {
Log.w(TAG, "launchStartupTask: StartupTask is still running. Skipped starting it twice.");
return;
}
onServiceStateChange(State.STARTING);
mStartupTask = new StartupTask(this);
mStartupTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
/**
* Sets up the initial configuration, and updates the config when coming from an old
* version.
*/
private class StartupTask extends AsyncTask<Void, Void, Void> {
private static class StartupTask extends AsyncTask<Void, Void, Void> {
private WeakReference<SyncthingService> refSyncthingService;
@Override
protected void onPreExecute() {
synchronized(mStateLock) {
if (mCurrentState != State.INIT) {
Log.e(TAG, "StartupTask: Wrong state " + mCurrentState + " detected. Cancelling.");
cancel(true);
return;
}
onServiceStateChange(State.STARTING);
}
}
StartupTask(SyncthingService context) {
refSyncthingService = new WeakReference<>(context);
}
@Override
protected Void doInBackground(Void... voids) {
try {
mConfig = new ConfigXml(SyncthingService.this);
mConfig.updateIfNeeded();
} catch (ConfigXml.OpenConfigException e) {
mNotificationHandler.showCrashedNotification(R.string.config_create_failed, true);
synchronized (mStateLock) {
onServiceStateChange(State.ERROR);
}
cancel(true);
}
return null;
}
@Override
protected Void doInBackground(Void... voids) {
SyncthingService syncthingService = refSyncthingService.get();
if (syncthingService == null) {
cancel(true);
return null;
}
try {
syncthingService.mConfig = new ConfigXml(syncthingService);
syncthingService.mConfig.updateIfNeeded();
} catch (ConfigXml.OpenConfigException e) {
syncthingService.mNotificationHandler.showCrashedNotification(R.string.config_create_failed, true);
synchronized (syncthingService.mStateLock) {
syncthingService.onServiceStateChange(State.ERROR);
}
cancel(true);
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
if (mApi == null) {
mApi = new RestApi(SyncthingService.this, mConfig.getWebGuiUrl(), mConfig.getApiKey(),
SyncthingService.this::onApiAvailable, () -> onServiceStateChange(mCurrentState));
Log.i(TAG, "Web GUI will be available at " + mConfig.getWebGuiUrl());
}
@Override
protected void onPostExecute(Void aVoid) {
// Get a reference to the service if it is still there.
SyncthingService syncthingService = refSyncthingService.get();
if (syncthingService != null) {
syncthingService.onStartupTaskCompleteListener();
}
}
}
// Start the syncthing binary.
if (mSyncthingRunnable != null || mSyncthingRunnableThread != null) {
Log.e(TAG, "StartupTask/onPostExecute: Syncthing binary lifecycle violated");
return;
}
mSyncthingRunnable = new SyncthingRunnable(SyncthingService.this, SyncthingRunnable.Command.main);
mSyncthingRunnableThread = new Thread(mSyncthingRunnable);
mSyncthingRunnableThread.start();
/**
* Callback on {@link StartupTask#onPostExecute}.
*/
private void onStartupTaskCompleteListener() {
if (mApi == null) {
mApi = new RestApi(this, mConfig.getWebGuiUrl(), mConfig.getApiKey(),
this::onApiAvailable, () -> onServiceStateChange(mCurrentState));
Log.i(TAG, "Web GUI will be available at " + mConfig.getWebGuiUrl());
}
/**
* Wait for the web-gui of the native syncthing binary to come online.
*
* In case the binary is to be stopped, also be aware that another thread could request
* to stop the binary in the time while waiting for the GUI to become active. See the comment
* for SyncthingService.onDestroy for details.
*/
if (mPollWebGuiAvailableTask == null) {
mPollWebGuiAvailableTask = new PollWebGuiAvailableTask(
SyncthingService.this,
getWebGuiUrl(),
mConfig.getApiKey(),
result -> {
// Start the syncthing binary.
if (mSyncthingRunnable != null || mSyncthingRunnableThread != null) {
Log.e(TAG, "onStartupTaskCompleteListener: Syncthing binary lifecycle violated");
return;
}
mSyncthingRunnable = new SyncthingRunnable(this, SyncthingRunnable.Command.main);
mSyncthingRunnableThread = new Thread(mSyncthingRunnable);
mSyncthingRunnableThread.start();
/**
* Wait for the web-gui of the native syncthing binary to come online.
*
* In case the binary is to be stopped, also be aware that another thread could request
* to stop the binary in the time while waiting for the GUI to become active. See the comment
* for {@link SyncthingService#onDestroy} for details.
*/
if (mPollWebGuiAvailableTask == null) {
mPollWebGuiAvailableTask = new PollWebGuiAvailableTask(
this, getWebGuiUrl(), mConfig.getApiKey(), result -> {
Log.i(TAG, "Web GUI has come online at " + mConfig.getWebGuiUrl());
if (mApi != null) {
mApi.readConfigFromRestApi();
}
});
}
}
}
}
);
}
}
/**
* Called when {@link PollWebGuiAvailableTask} confirmed the REST API is available.
* We can assume mApi being available under normal conditions.
* Called when {@link RestApi#checkReadConfigFromRestApiCompleted} detects
* the RestApi class has been fully initialized.
* UI stressing results in mApi getting null on simultaneous shutdown, so
* we check it for safety.
*/
@ -534,7 +564,7 @@ public class SyncthingService extends Service {
} catch (IOException e) {
Log.w(TAG, "Failed to import config", e);
}
new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
launchStartupTask();
});
return true;
}