Потокобезопасный сбор покрытия

[sfaqer]

Сбор покрытия (-codestat) ронял многопоточный код. Фоновые задания пишут в один CodeStatProcessor, а его словари были без блокировок, и из движка в скрипт вылетали KeyNotFoundException и ArgumentException: An item with the same key has already been added (autumn, ещё).

• Точки и счетчики — ConcurrentDictionary, увеличение через Interlocked, общей блокировки нет. Порядок точек в отчете прежний.
• Время каждый поток меряет сам (ThreadLocal), по точке оно копится атомарно. Когда процесс завершается (фоновое задание, запрос веб-сервера), замер потока закрывается, и простой потока в пуле не попадает в последнюю строку.
• TypeFactoryCache и кэш конструкторов в TypeFactory тоже переведены на ConcurrentDictionary: первое параллельное Новый одного типа портило их и без покрытия.

Тесты — CodeStatProcessorTests, в том числе 16 фоновых заданий под покрытием, которые одновременно создают объекты одних классов и загружают сценарии из строк. До исправления падают, после — 60 прогонов подряд зеленые. Однопоточный отчет не изменился, а сам сбор покрытия стал быстрее примерно вдвое (3,8 с → 2,0 с на однопоточной синтетике, без покрытия разницы нет). Четыре многопоточных теста autumn, выключенных в autumn-library/autumn#155, с этим движком под покрытием проходят 10 из 10, весь набор autumn — 120 из 120.

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Summary by CodeRabbit

• Bug Fixes
  • Improved code statistics when scripts run concurrently, with more accurate execution counts and elapsed-time tracking.
  • Idle time between script processes is no longer included in execution statistics.
  • Improved reliability when multiple threads create or access script types.
  • Statistics retain entry registration order, and unregistered entries no longer interrupt script execution.

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ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

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Run ID: 084920d3-12d4-415d-b990-a33c3eb8e32c

📥 Commits

Reviewing files that changed from the base of the PR and between 189eb92 and d56f89b.

📒 Files selected for processing (5)

• src/ScriptEngine/Machine/CodeStat/CodeStatProcessor.cs
• src/ScriptEngine/Machine/CodeStat/ICodeStatCollector.cs
• src/ScriptEngine/Machine/StackMachineExecutor.cs
• src/ScriptEngine/Machine/TypeFactory.cs
• src/ScriptEngine/Types/TypeFactoryCache.cs

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📝 Walkthrough

Walkthrough

Code-stat collection now aggregates counts concurrently and tracks elapsed time per thread. Process exit stops the current thread’s active watch. Type-factory caches use concurrent dictionaries. Tests cover concurrent updates, timing, ordering, shared-module execution, and idle intervals.

Changes

Concurrent execution and code statistics

Layer / File(s)	Summary
Concurrent type-factory caches src/ScriptEngine/Machine/TypeFactory.cs, src/ScriptEngine/Types/TypeFactoryCache.cs	The constructor cache and type-factory cache now use concurrent dictionaries. TypeFactoryCache.GetFactoryFor uses GetOrAdd.
Per-thread code-stat collection src/ScriptEngine/Machine/CodeStat/CodeStatProcessor.cs, src/ScriptEngine/Machine/CodeStat/ICodeStatCollector.cs, src/Tests/OneScript.Core.Tests/CodeStatProcessorTests.cs	Entry counts update concurrently, and each thread tracks its active timing entry. Snapshots preserve registration order. Tests cover concurrent updates, timing, ordering, unregistered entries, and background tasks using shared modules.
Stop timing when script processing exits src/ScriptEngine/Machine/StackMachineExecutor.cs, src/Tests/OneScript.Core.Tests/CodeStatProcessorTests.cs	AfterProcessExit stops the current thread’s code-stat watch. A test checks that idle time between scripts is not recorded.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ScriptProcess
  participant StackMachineExecutor
  participant ICodeStatCollector
  participant CodeStatProcessor
  ScriptProcess->>StackMachineExecutor: process exits
  StackMachineExecutor->>ICodeStatCollector: StopCurrentWatch()
  ICodeStatCollector->>CodeStatProcessor: stop current thread's active timer

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Merge Risk: ⚪ Minimal · up to d56f8

No concrete blocking issue remains identified. The concurrent coverage changes appear ready to merge after normal build and test checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to d56f8

The change reduces concurrency failures without a demonstrated increase in access or privileges. Residual timing issues appear limited to statistics attribution, but incomplete coverage prevents a definitive minimal-risk assessment.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated exposure is shared in-process state used by concurrent script executions: statistics remain shared by entry, while active timing belongs to each physical thread and factories belong to resolved descriptors. These mechanisms are concurrency controls, not tenant-isolation controls; deployment-level sharing is not established by the available evidence.

Trust Boundaries and Controls

• inferred — The inspected activation path does not gain a new constructor-reachability or privilege transition. Resolution still precedes activation, unresolved names fail before factory use, and the cache change preserves selection semantics and call-local process authority. This conclusion does not assess every resolver or host policy.

Resilience and Maintainability Implications

• inferred — Ordinary exceptional and interrupted exits reach timing cleanup through the process finally block. An exception from preceding termination cleanup could skip that callback and retain an interval across thread reuse. The supported residual effect is inaccurate statistics attribution, not a demonstrated authority or data-access breach.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 28 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: making code coverage collection thread-safe for multithreaded execution.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
Review comments at @src/ScriptEngine/Machine/CodeStat/CodeStatProcessor.cs:
- Around line 66-76: Update GetStatData to include uncommitted time from active
intervals, accumulating committed and active durations in Stopwatch timestamp
ticks and converting the complete total to milliseconds once. Track active state
across all participating threads and expose it through the current ThreadLocal;
do not rely only on the snapshot thread’s state or add a shared lock to every
SwitchTo call.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 34144dd7-4567-4514-b8f9-3ca129533069

📥 Commits

Reviewing files that changed from the base of the PR and between 0a915a0 and 189eb92.

📒 Files selected for processing (6)

• src/ScriptEngine/Machine/CodeStat/CodeStatProcessor.cs
• src/ScriptEngine/Machine/CodeStat/ICodeStatCollector.cs
• src/ScriptEngine/Machine/StackMachineExecutor.cs
• src/ScriptEngine/Machine/TypeFactory.cs
• src/ScriptEngine/Types/TypeFactoryCache.cs
• src/Tests/OneScript.Core.Tests/CodeStatProcessorTests.cs

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.