The on-device perf harness cannot force a genuinely uncached body fetch: proactive
backfill (#12) and post-sync body prefetch (#88/#89) warm the cache before a test can
open a message. Add a debug-only, adb-reachable hook to pause proactive fetch so a real
uncached open can be measured.
Components:
- DebugFetchGate (src/main): thread-safe in-memory holder of paused FetchScopes
(BACKFILL, PREFETCH; `all` alias). Defaults to not-paused; HEADER_SYNC and on-demand
OPEN are never gateable.
- FetchGateReceiver (src/debug only): BroadcastReceiver registered in the debug manifest,
driven by `adb shell am broadcast -a org.libremail.debug.FETCH_GATE -n .../FetchGateReceiver
--es action <pause|resume|query> --es scope <backfill,prefetch|all>`. Returns the state as
ordered-broadcast result data (paused=[...]) for a synchronous read-back.
Enforcement (each read guarded by BuildConfig.DEBUG so R8 strips it from release):
- BackfillWorker.doWork() entry -> skip-and-reschedule when BACKFILL is paused, mirroring
the existing cache-lock deferral (covers periodic + backfillNow()).
- MailSyncer/MailBackfiller.prefetchIfEnabled -> early-return when PREFETCH is paused.
openMessage / fetchBodyMarkingSeen / fetchAttachment are deliberately NOT gated.
Debug-only: receiver + <receiver> live wholly in src/debug; every gate read in main is
behind BuildConfig.DEBUG. Verified on assembleRelease that R8 strips DebugFetchGate /
FetchScope / FetchGateReceiver and the log strings from the release APK, and the merged
release manifest has no FETCH_GATE receiver.
PII-free AppLog breadcrumbs on pause/resume/query and on each gate-triggered defer/skip
(scope names only).
Tests: DebugFetchGateTest, BackfillWorkerTest / MailSyncerTest / MailBackfillerTest
enforcement cases, and FetchGateReceiverInstrumentedTest (ordered-broadcast -> gate ->
read-back; gated worker defers while an un-gated path runs).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Guards the SQLCipher cold-start crash fixed in 592a797 (bug #210): a cold
process opening an already-encrypted cache with nothing to convert reached
Room's keyed nativeOpen with the native .so unloaded and crash-looped with
UnsatisfiedLinkError. Every existing on-device test (DatabaseEncryptionTest,
DatabaseProvisionerInstrumentedTest, DatabaseModuleInstrumentedTest,
AccountDataMigratorTest) runs a conversion first, which loads the process-global
library in-process, masking the bug exactly as production did.
System.loadLibrary is process-global, so the instrumentation process can no
longer observe a cold open once it has minted the encrypted fixture. This adds
ColdOpenCacheProbe -- a debug-only ContentProvider declared with
android:process=":coldopen" -- to host the open in a separate, pristine app
process. The test mints the encrypted fixture in the instrumentation process
(a file created by a prior encrypted DB instance) and drives the cold open in
the :coldopen process via ContentResolver.call, mirroring DatabaseProvisioner's
encrypted branch + DatabaseModule's open lambda against the real DatabaseEncryption,
DeferredOpenHelperFactory and SupportOpenHelperFactory. A cold probe (a keyed open
with no preceding load, asserted to throw UnsatisfiedLinkError) makes the isolation
self-verifying: the test fails rather than passing hollow if the library was
already loaded in the harness process.
Verified locally on an API 36 emulator (connectedDebugAndroidTest): 1 test,
0 failures.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8