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fix(stats): overview polling overlaps ticks, reorders samples and hides errors; one shared polling controller

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
42/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
dart, flutter, mongodb, mysql, postgresql, redis
Ambito
backend, databases, desktop

Direzione di ricerca

Read the five polling implementations named in the issue, starting with lib/core/motion/ticker_gated_polling.dart and the PostgreSQL and MySQL stats views. Trace how each view starts and stops polling and handles tick results, then add tests with a fake clock for non-overlapping ticks, error backoff and recovery, and polling paused by TickerMode. Done when all five views use the shared controller and those behaviors are covered.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug frontend P2 stability

Problem

Five Overview/stats screens poll the server with the same copy-pasted code:

File Interval Tick
features/postgresql/postgres_stats_view.dart:185-200 5 s serverStats()
features/mysql/mysql_stats_view.dart:143-158 5 s serverStats()
features/redis/redis_view.dart:196-211 3 s INFO
features/mongodb/mongo_stats_view.dart:168-191 3 s default serverStatus
features/extensions/extension_stats_view.dart:104-116 5 s JSON-RPC getServerStats

Each one does Timer.periodic(interval, (_) => unawaited(_onPollTick())) (also in syncTickerGatedPeriodicTimer, lib/core/motion/ticker_gated_polling.dart:23):

  • Ticks overlap. A tick does not wait for the previous one. When the server is slow, requests pile up on it exactly when it is struggling. For extension drivers the RPC timeout defaults to 60 s (extension_driver_session.dart:189-192), so a hung driver collects up to 12 concurrent getServerStats calls.
  • Samples land out of order. Postgres and MySQL append each result to the sparkline history (_recordHistory) on completion, so overlapping ticks reorder points.
  • Errors are invisible. catch (_) {} in every tick: no "stale since" state, no backoff, the dashboard silently freezes on the last good sample.
  • The timer is started from build() via syncTickerGatedPeriodicTimer (a side effect in build), and each view also keeps its own _startTimer.

Fix

One small PollingController (or mixin) in core/motion / core/util:

  • self-rescheduling: await tick() then schedule the next one, so at most one request is in flight;
  • gated by TickerMode (keep the current behaviour) and shouldRun;
  • exponential backoff on errors, last error + last success time exposed as a ValueListenable for a "stale" hint;
  • started and stopped from didChangeDependencies / dispose, not build.

Replace the five copies. Tests with a fake clock: a slow tick never overlaps; errors back off and recover; TickerMode off stops polling.

Lingua principale
Dart
Stelle
23
Fork
1
Merge medio
31m
PR unite (30g)
570

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