Merge "updater_sample: Improve update completion handling"
am: 9455173f87
Change-Id: Id4b1ff4cc2afe36a0acffe3bc0a323cc06416c6c
diff --git a/updater_sample/README.md b/updater_sample/README.md
index 3f211dd..f6c63a7 100644
--- a/updater_sample/README.md
+++ b/updater_sample/README.md
@@ -65,6 +65,32 @@
6. Push OTA packages to the device.
+## Sample App State vs UpdateEngine Status
+
+UpdateEngine provides status for different stages of update application
+process. But it lacks of proper status codes when update fails.
+
+This creates two problems:
+
+1. If sample app is unbound from update_engine (MainActivity is paused, destroyed),
+ app doesn't receive onStatusUpdate and onPayloadApplicationCompleted notifications.
+ If app binds to update_engine after update is completed,
+ only onStatusUpdate is called, but status becomes IDLE in most cases.
+ And there is no way to know if update was successful or not.
+
+2. This sample app demostrates suspend/resume using update_engins's
+ `cancel` and `applyPayload` (which picks up from where it left).
+ When `cancel` is called, status is set to `IDLE`, which doesn't allow
+ tracking suspended state properly.
+
+To solve these problems sample app implements its own separate update
+state - `UpdaterState`. To solve the first problem, sample app persists
+`UpdaterState` on a device. When app is resumed, it checks if `UpdaterState`
+matches the update_engine's status (as onStatusUpdate is guaranteed to be called).
+If they doesn't match, sample app calls `applyPayload` again with the same
+parameters, and handles update completion properly using `onPayloadApplicationCompleted`
+callback. The second problem is solved by adding `PAUSED` updater state.
+
## Sending HTTP headers from UpdateEngine
Sometimes OTA package server might require some HTTP headers to be present,
@@ -76,6 +102,44 @@
which HTTP headers are supported.
+## Used update_engine APIs
+
+### UpdateEngine#bind
+
+Binds given callbacks to update_engine. When update_engine successfully
+initialized, it's guaranteed to invoke callback onStatusUpdate.
+
+### UpdateEngine#applyPayload
+
+Start an update attempt to download an apply the provided `payload_url` if
+no other update is running. The extra `key_value_pair_headers` will be
+included when fetching the payload.
+
+### UpdateEngine#cancel
+
+Cancel the ongoing update. The update could be running or suspended, but it
+can't be canceled after it was done.
+
+### UpdateEngine#resetStatus
+
+Reset the already applied update back to an idle state. This method can
+only be called when no update attempt is going on, and it will reset the
+status back to idle, deleting the currently applied update if any.
+
+### Callback: onStatusUpdate
+
+Called whenever the value of `status` or `progress` changes. For
+`progress` values changes, this method will be called only if it changes significantly.
+At this time of writing this doc, delta for `progress` is `0.005`.
+
+`onStatusUpdate` is always called when app binds to update_engine,
+except when update_engine fails to initialize.
+
+### Callback: onPayloadApplicationComplete
+
+Called whenever an update attempt is completed.
+
+
## Development
- [x] Create a UI with list of configs, current version,
@@ -90,6 +154,10 @@
- [x] Add demo for passing HTTP headers to `UpdateEngine#applyPayload`
- [x] [Package compatibility check](https://source.android.com/devices/architecture/vintf/match-rules)
- [x] Deferred switch slot demo
+- [x] Add UpdateManager; extract update logic from MainActivity
+- [x] Add Sample app update state (separate from update_engine status)
+- [-] Add smart update completion detection using onStatusUpdate
+- [ ] Add pause/resume demo
- [ ] Add demo for passing NETWORK_ID to `UpdateEngine#applyPayload`
- [ ] Verify system partition checksum for package
- [?] Add non-A/B updates demo
diff --git a/updater_sample/src/com/example/android/systemupdatersample/UpdateManager.java b/updater_sample/src/com/example/android/systemupdatersample/UpdateManager.java
index c4c8c9c..f5c2ea5 100644
--- a/updater_sample/src/com/example/android/systemupdatersample/UpdateManager.java
+++ b/updater_sample/src/com/example/android/systemupdatersample/UpdateManager.java
@@ -384,11 +384,85 @@
updateEngineApplyPayload(builder.build());
}
+ /**
+ * Verifies if mUpdaterState matches mUpdateEngineStatus.
+ * If they don't match, runs applyPayload to trigger onPayloadApplicationComplete
+ * callback, which updates mUpdaterState.
+ */
+ private void ensureCorrectUpdaterState() {
+ // When mUpdaterState is one of IDLE, PAUSED, ERROR, SLOT_SWITCH_REQUIRED
+ // then mUpdateEngineStatus must be IDLE.
+ // When mUpdaterState is RUNNING,
+ // then mUpdateEngineStatus must not be IDLE or UPDATED_NEED_REBOOT.
+ // When mUpdaterState is REBOOT_REQUIRED,
+ // then mUpdateEngineStatus must be UPDATED_NEED_REBOOT.
+ int state = mUpdaterState.get();
+ int updateEngineStatus = mUpdateEngineStatus.get();
+ if (state == UpdaterState.IDLE
+ || state == UpdaterState.ERROR
+ || state == UpdaterState.PAUSED
+ || state == UpdaterState.SLOT_SWITCH_REQUIRED) {
+ ensureUpdateEngineStatusIdle(state, updateEngineStatus);
+ } else if (state == UpdaterState.RUNNING) {
+ ensureUpdateEngineStatusRunning(state, updateEngineStatus);
+ } else if (state == UpdaterState.REBOOT_REQUIRED) {
+ ensureUpdateEngineStatusReboot(state, updateEngineStatus);
+ }
+ }
+
+ private void ensureUpdateEngineStatusIdle(int state, int updateEngineStatus) {
+ if (updateEngineStatus == UpdateEngine.UpdateStatusConstants.IDLE) {
+ return;
+ }
+ // It might happen when update is started not from the sample app.
+ // To make the sample app simple, we won't handle this case.
+ throw new RuntimeException("When mUpdaterState is " + state
+ + " mUpdateEngineStatus expected to be "
+ + UpdateEngine.UpdateStatusConstants.IDLE
+ + ", but it is " + updateEngineStatus);
+ }
+
+ private void ensureUpdateEngineStatusRunning(int state, int updateEngineStatus) {
+ if (updateEngineStatus != UpdateEngine.UpdateStatusConstants.UPDATED_NEED_REBOOT
+ && updateEngineStatus != UpdateEngine.UpdateStatusConstants.IDLE) {
+ return;
+ }
+ // Re-apply latest update. It makes update_engine to invoke
+ // onPayloadApplicationComplete callback. The callback notifies
+ // if update was successful or not.
+ updateEngineReApplyPayload();
+ }
+
+ private void ensureUpdateEngineStatusReboot(int state, int updateEngineStatus) {
+ if (updateEngineStatus == UpdateEngine.UpdateStatusConstants.UPDATED_NEED_REBOOT) {
+ return;
+ }
+ // This might happen when update is installed by other means,
+ // and sample app is not aware of it. To make the sample app simple,
+ // we won't handle this case.
+ throw new RuntimeException("When mUpdaterState is " + state
+ + " mUpdateEngineStatus expected to be "
+ + UpdateEngine.UpdateStatusConstants.UPDATED_NEED_REBOOT
+ + ", but it is " + updateEngineStatus);
+ }
+
+ /**
+ * Invoked by update_engine whenever update status or progress changes.
+ * It's also guaranteed to be invoked when app binds to the update_engine, except
+ * when update_engine fails to initialize (as defined in
+ * system/update_engine/binder_service_android.cc in
+ * function BinderUpdateEngineAndroidService::bind).
+ *
+ * @param status one of {@link UpdateEngine.UpdateStatusConstants}.
+ * @param progress a number from 0.0 to 1.0.
+ */
private void onStatusUpdate(int status, float progress) {
int previousStatus = mUpdateEngineStatus.get();
mUpdateEngineStatus.set(status);
mProgress.set(progress);
+ ensureCorrectUpdaterState();
+
getOnProgressUpdateCallback().ifPresent(callback -> callback.accept(progress));
if (previousStatus != status) {
@@ -413,7 +487,7 @@
}
/**
- * Helper class to delegate {@code update_engine} callbacks to UpdateManager
+ * Helper class to delegate {@code update_engine} callback invocations to UpdateManager.
*/
class UpdateEngineCallbackImpl extends UpdateEngineCallback {
@Override
diff --git a/updater_sample/src/com/example/android/systemupdatersample/ui/MainActivity.java b/updater_sample/src/com/example/android/systemupdatersample/ui/MainActivity.java
index 0b571cc..1de72c2 100644
--- a/updater_sample/src/com/example/android/systemupdatersample/ui/MainActivity.java
+++ b/updater_sample/src/com/example/android/systemupdatersample/ui/MainActivity.java
@@ -108,12 +108,16 @@
@Override
protected void onResume() {
super.onResume();
+ // TODO(zhomart) load saved states
+ // Binding to UpdateEngine invokes onStatusUpdate callback,
+ // persisted updater state has to be loaded and prepared beforehand.
this.mUpdateManager.bind();
}
@Override
protected void onPause() {
this.mUpdateManager.unbind();
+ // TODO(zhomart) save state
super.onPause();
}