optimize CrontabWatcher

[yileicn]

PR Type

Enhancement, Bug fix
The problem of Redis timeout causing job crashes

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Description

• Add exception handling to prevent service crashes

• Implement try-catch block with logging and recovery

• Increase delay to 3 seconds on error for resilience

• Improve code structure with better error management

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Diagram Walkthrough

flowchart LR
  A["CrontabWatcher Loop"] --> B["Try Block"]
  B --> C["Lock & Run Checker"]
  C --> D{Lock Acquired?}
  D -->|Yes| E["Execute Task"]
  D -->|No| F["Delay 1s"]
  E --> G["Delay 1s"]
  C --> H["Catch Exception"]
  H --> I["Log Warning"]
  I --> J["Delay 3s"]
  F --> A
  G --> A
  J --> A

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File Walkthrough

Relevant files

Error handling

CrontabWatcher.cs Add exception handling and error recovery                                src/Infrastructure/BotSharp.Core.Crontab/Services/CrontabWatcher.cs Wrapped main loop logic in try-catch block for exception handling Added exception logging with descriptive warning message Increased error recovery delay from 1 second to 3 seconds Improved code readability with better indentation and structure +15/-8

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[qodo-merge-pro]

PR Compliance Guide 🔍

(Compliance updated until commit c6b476c)

Below is a summary of compliance checks for this PR:

Security Compliance
🟢	No security concerns identified No security vulnerabilities detected by AI analysis. Human verification advised for critical code.
Ticket Compliance
⚪	🎫 No ticket provided Create ticket/issue
Codebase Duplication Compliance
⚪	Codebase context is not defined Follow the guide to enable codebase context checks.
Custom Compliance
🟢	Generic: Meaningful Naming and Self-Documenting Code Objective: Ensure all identifiers clearly express their purpose and intent, making code self-documenting Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Error Handling Objective: To prevent the leakage of sensitive system information through error messages while providing sufficient detail for internal debugging. Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Logging Practices Objective: To ensure logs are useful for debugging and auditing without exposing sensitive information like PII, PHI, or cardholder data. Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Security-First Input Validation and Data Handling Objective: Ensure all data inputs are validated, sanitized, and handled securely to prevent vulnerabilities Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
⚪	Generic: Comprehensive Audit Trails Objective: To create a detailed and reliable record of critical system actions for security analysis and compliance. Status: Insufficient Auditing: The added error handling only logs a warning message without structured context (e.g., user/job identifiers), making it unclear if critical cron actions are fully audited. Referred Code try { var isLocked = await locker.LockAsync(DIST_KEY, async () => { await RunCronChecker(scope.ServiceProvider); await Task.Delay(1000, stoppingToken); }); if (!isLocked) { await Task.Delay(1000, stoppingToken); } } catch (Exception ex) { _logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); await Task.Delay(3000, stoppingToken); } Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Robust Error Handling and Edge Case Management Objective: Ensure comprehensive error handling that provides meaningful context and graceful degradation Status: Generic Warning: Exceptions are caught and only the message is logged without actionable context (e.g., lock key, retry count, exception type) which may hinder production debugging. Referred Code catch (Exception ex) { _logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); await Task.Delay(3000, stoppingToken); Learn more about managing compliance generic rules or creating your own custom rules

Compliance status legend

🟢 - Fully Compliant
🟡 - Partial Compliant
🔴 - Not Compliant
⚪ - Requires Further Human Verification
🏷️ - Compliance label

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Previous compliance checks

Compliance check up to commit c6b476c

Security Compliance
🟢	No security concerns identified No security vulnerabilities detected by AI analysis. Human verification advised for critical code.
Ticket Compliance
⚪	🎫 No ticket provided Create ticket/issue
Codebase Duplication Compliance
⚪	Codebase context is not defined Follow the guide to enable codebase context checks.
Custom Compliance
🟢	Generic: Meaningful Naming and Self-Documenting Code Objective: Ensure all identifiers clearly express their purpose and intent, making code self-documenting Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Error Handling Objective: To prevent the leakage of sensitive system information through error messages while providing sufficient detail for internal debugging. Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Logging Practices Objective: To ensure logs are useful for debugging and auditing without exposing sensitive information like PII, PHI, or cardholder data. Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Security-First Input Validation and Data Handling Objective: Ensure all data inputs are validated, sanitized, and handled securely to prevent vulnerabilities Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
⚪	Generic: Comprehensive Audit Trails Objective: To create a detailed and reliable record of critical system actions for security analysis and compliance. Status: Action logging: The new error-handling path only logs a warning on exceptions and does not add audit-style logs for critical actions like lock acquisition attempts, task execution outcomes, or lock contention results, making full auditability unclear. Referred Code try { var isLocked = await locker.LockAsync(DIST_KEY, async () => { await RunCronChecker(scope.ServiceProvider); await Task.Delay(1000, stoppingToken); }); if (!isLocked) { await Task.Delay(1000, stoppingToken); } } catch (Exception ex) { _logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); await Task.Delay(3000, stoppingToken); Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Robust Error Handling and Edge Case Management Objective: Ensure comprehensive error handling that provides meaningful context and graceful degradation Status: Generic warning: The catch block logs only ex.Message without context (e.g., which operation failed, lock key, retries) and does not differentiate cancellation exceptions, which may hinder actionable diagnostics. Referred Code catch (Exception ex) { _logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); await Task.Delay(3000, stoppingToken); Learn more about managing compliance generic rules or creating your own custom rules

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Prevent memory leaks from captive dependencies To prevent memory leaks from captive dependencies, move the using (var scope = ...) block inside the while loop. This ensures a new scope is created for each iteration and its services are properly disposed. src/Infrastructure/BotSharp.Core.Crontab/Services/CrontabWatcher.cs [28-54] -using (var scope = _services.CreateScope()) +while (!stoppingToken.IsCancellationRequested) { - var locker = scope.ServiceProvider.GetRequiredService<IDistributedLocker>(); + try + { + using var scope = _services.CreateScope(); + var locker = scope.ServiceProvider.GetRequiredService<IDistributedLocker>(); + var isLocked = await locker.LockAsync(DIST_KEY, async () => + { + await RunCronChecker(scope.ServiceProvider); + await Task.Delay(1000, stoppingToken); + }); - while (!stoppingToken.IsCancellationRequested) - { - try + if (!isLocked) { - var isLocked = await locker.LockAsync(DIST_KEY, async () => - { - await RunCronChecker(scope.ServiceProvider); - await Task.Delay(1000, stoppingToken); - }); - if (!isLocked) - { - await Task.Delay(1000, stoppingToken); - } - } - catch (Exception ex) - { - _logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); - await Task.Delay(3000, stoppingToken); + await Task.Delay(1000, stoppingToken); } } - - _logger.LogWarning("Crontab Watcher background service is stopped."); + catch (Exception ex) + { + _logger.LogWarning(ex, "Crontab Watcher background service error"); + await Task.Delay(3000, stoppingToken); + } } +_logger.LogWarning("Crontab Watcher background service is stopped."); + [To ensure code accuracy, apply this suggestion manually] Suggestion importance[1-10]: 9 __ Why: This suggestion identifies a critical "captive dependency" issue that can lead to memory leaks in a long-running background service. Moving the IServiceScope creation inside the loop is the correct fix and is crucial for application stability.	High
General	Log the full exception object Improve exception logging by passing the full exception object to _logger.LogWarning instead of just the message string to include the stack trace and other details. src/Infrastructure/BotSharp.Core.Crontab/Services/CrontabWatcher.cs [48] -_logger.LogWarning($"Crontab Watcher background service error: {ex.Message}"); +_logger.LogWarning(ex, "Crontab Watcher background service error"); Apply / Chat Suggestion importance[1-10]: 7 __ Why: The suggestion correctly points out that logging only ex.Message loses important debugging information and proposes using the standard ILogger overload to log the full exception, which is a significant improvement for observability.	Medium
Learned best practice	Honor cancellation without leaking tokens Avoid passing the loop's cancellation token into inner delays; instead await the work and delay with WaitAsync(stoppingToken) and catch OperationCanceledException to allow proper cleanup. src/Infrastructure/BotSharp.Core.Crontab/Services/CrontabWatcher.cs [36-44] -var isLocked = await locker.LockAsync(DIST_KEY, async () => +try { - await RunCronChecker(scope.ServiceProvider); - await Task.Delay(1000, stoppingToken); -}); -if (!isLocked) + var isLocked = await locker.LockAsync(DIST_KEY, async () => + { + await RunCronChecker(scope.ServiceProvider); + await Task.Delay(1000); + }); + if (!isLocked) + { + await Task.Delay(1000).WaitAsync(stoppingToken); + } + else + { + await Task.Delay(0).WaitAsync(stoppingToken); // noop yield honoring cancellation + } +} +catch (OperationCanceledException) { - await Task.Delay(1000, stoppingToken); + throw; } Apply / Chat Suggestion importance[1-10]: 6 __ Why: Relevant best practice - Ensure cooperative cancellation and cleanup by not passing cancellation tokens into Task.Run work scheduled inside loops; await with WaitAsync(cancellationToken) and catch OperationCanceledException so finally/cleanup can run.	Low
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[adenchen123]

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