Node / meshtastic / Meshtastic-Android / files / core / database / src / commonMain / kotlin / org / meshtastic / core / database / DbFlowRecovery.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.core.database

Tff7b72import T7ee787co.touchlab.kermit.Logger

Tff7b72import T7ee787kotlinx.coroutines.delay

Tff7b72import T7ee787kotlinx.coroutines.flow.Flow

Tff7b72import T7ee787kotlinx.coroutines.flow.emitAll

Tff7b72import T7ee787kotlinx.coroutines.flow.flow

Tff7b72import T7ee787kotlinx.coroutines.flow.onEach

Tff7b72import T7ee787kotlinx.coroutines.flow.retryWhen

Tff7b72private Tff7b72const Tff7b72val Te6edf3INITIAL_DB_RETRY_DELAY_MS Tff7b72= T79c0ff1Te6edf3_000L

Tff7b72private Tff7b72const Tff7b72val Te6edf3MAX_DB_RETRY_DELAY_MS Tff7b72= T79c0ff3T79c0ff0Te6edf3_000L

Tff7b72private Tff7b72const Tff7b72val Te6edf3MAX_DB_RETRY_BACKOFF_SHIFT Tff7b72= T79c0ff5

T8b949e/**

* Restarts a database-backed Flow after the Room pool wedge behind #6608 — an acquire timeout or a stall — with capped

* exponential backoff. The backoff resets after a successful emission; every other failure propagates.

*

* [DatabaseManager.observeCurrentDb] recovers a wedged pool in place, but its per-collector and per-window budgets can

* exhaust while a leaked-permit storm is still active; a `stateIn(..., SharingStarted.Eagerly, ...)` upstream that then

* throws is dead for the process lifetime. Retrying re-enters recovery with a fresh collector once the manager's rate

* window reopens.

*

* Deliberately narrower than [DatabaseManager.isDbClosedException]: a closed pool is not retried here.

* `observeCurrentDb` re-latches on the replacement pool by itself, so retrying adds nothing — and it would keep a flow

* alive that used to terminate, turning a dead collector into a backoff loop that outlives its collecting scope.

*/

Tff7b72fun Tff7b72<Te6edf3TTff7b72> Td2a8ffFlowTff7b72<Te6edf3TTff7b72>Tb4b4b4.Te6edf3retryOnDbPoolFailureTb4b4b4(Te6edf3labelTb4b4b4: Tffa657StringTb4b4b4)Tb4b4b4: Te6edf3FlowTff7b72<Te6edf3TTff7b72> Tff7b72= Te6edf3flow Tb4b4b4{

T8b949e// Per-collection state: each collector backs off independently, and a plain var is safe because a Flow is

T8b949e// collected by one coroutine at a time.

Tff7b72var Te6edf3consecutiveFailures Tff7b72= T79c0ff0

Te6edf3emitAllTb4b4b4(

Te6edf3onEach Tb4b4b4{ Te6edf3consecutiveFailures Tff7b72= T79c0ff0 Tb4b4b4}

Tb4b4b4.Te6edf3retryWhen Tb4b4b4{ Te6edf3causeTb4b4b4, Te6edf3_ Tff7b72-Tff7b72>

Tff7b72val Te6edf3recoverable Tff7b72=

Te6edf3cause Tff7b72is Te6edf3DbFlowStalledException Tff7b72|Tff7b72|

Tb4b4b4(Te6edf3cause Tff7b72is Te6edf3Exception Tff7b72&Tff7b72& Te6edf3DatabaseManagerTb4b4b4.Te6edf3isDbPoolAcquireTimeoutExceptionTb4b4b4(Te6edf3causeTb4b4b4)Tb4b4b4)

Tff7b72if Tb4b4b4(Tff7b72!Te6edf3recoverableTb4b4b4) Tff7b72returnTf0883e@retryWhen Tff7b72false

Te6edf3consecutiveFailures Tff7b72+Tff7b72= T79c0ff1

Tff7b72val Te6edf3delayMs Tff7b72=

Tb4b4b4(Te6edf3INITIAL_DB_RETRY_DELAY_MS Te6edf3shl Tb4b4b4(Te6edf3consecutiveFailures Tff7b72- T79c0ff1Tb4b4b4)Tb4b4b4.Te6edf3coerceAtMostTb4b4b4(Te6edf3MAX_DB_RETRY_BACKOFF_SHIFTTb4b4b4)Tb4b4b4)

Tb4b4b4.Te6edf3coerceAtMostTb4b4b4(Te6edf3MAX_DB_RETRY_DELAY_MSTb4b4b4)

Te6edf3LoggerTb4b4b4.Te6edf3wTb4b4b4(Te6edf3causeTb4b4b4) Tb4b4b4{ Ta5d6ff"Ta5d6ffDB flow 'Tffd700$Te6edf3labelTa5d6ff' failed with a recoverable pool error; retrying in Tffd700${Te6edf3delayMsTffd700}Ta5d6ffmsTa5d6ff" Tb4b4b4}

Te6edf3delayTb4b4b4(Te6edf3delayMsTb4b4b4)

Tff7b72true

Tb4b4b4}Tb4b4b4,

Tb4b4b4)

Tb4b4b4}

T8b949e/** Signals that a database-backed Flow never produced its first value, i.e. the Room pool is not serving queries. */

Tff7b72class T56d364DbFlowStalledExceptionTb4b4b4(Te6edf3messageTb4b4b4: Tffa657StringTb4b4b4) Tb4b4b4: Te6edf3IllegalStateExceptionTb4b4b4(Te6edf3messageTb4b4b4)