Implement Structured Concurrency Model with Enhanced Thread Safety and Logging

[mayankmahavar1mg]

Overview

This PR introduces a comprehensive structured concurrency model to improve thread safety, performance, and debugging capabilities in our WebView-based application.

Key Changes

• Implemented actor-based WebResourceManager for thread-safe resource handling
• Enhanced CacheManager with proper actor isolation and background operations
• Added @MainActor annotations to ensure UI updates occur on the main thread
• Introduced comprehensive logging system for thread tracking and debugging
• Improved error handling and resource lifecycle management

Technical Details

Concurrency Improvements

• Created dedicated actor for resource management
• Separated UI and background operations
• Implemented proper task cancellation
• Added structured async/await patterns

Cache Enhancements

• Moved disk operations to background threads
• Improved cache validation logic
• Added thread-safe resource loading
• Enhanced cache hit/miss tracking

Logging System

• Added thread context tracking
• Implemented operation timing logs
• Enhanced error reporting
• Added visual indicators for different operations:
  • 🏠 Main Thread operations
  • 🧵 Background Thread operations
  • 💾 Cache operations
  • 🌐 Network requests
  • ⚠️ Warnings and errors

Testing

• Verified thread safety with concurrent requests
• Tested cache operations under heavy load
• Validated UI responsiveness
• Confirmed proper error handling
• Tested memory management and resource cleanup

Performance Impact

• Reduced main thread blocking
• Improved cache response times
• Better memory utilization
• More efficient resource management

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DeputyDev generated PR summary:

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Size L: This PR changes include 426 lines and should take approximately 1-3 hours to review

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The pull request titled "Implement Structured Concurrency Model with Enhanced Thread Safety and Logging" introduces several enhancements to an iOS native web view project. Here's a breakdown of the key changes:

1. Structured Concurrency: The PR utilizes Swift's actor model to ensure thread safety, particularly in the CacheManager and WebResourceManager. This helps manage concurrent access to shared resources safely and efficiently.

2. Enhanced Thread Safety: A new utility, ThreadHelper, is introduced to log the current thread context (main or background thread) whenever a log message is generated. This provides better insight into the execution context of various operations.

3. Improved Logging: Extensive logging has been added throughout the codebase to track the flow of operations and state changes. The logs include thread context information and are structured to provide clear and concise feedback on the application's behavior.

4. New Components:

   • WebResourceManager: This new component is responsible for managing web resource loading, leveraging both cache and network requests. It ensures that only one resource request per URL is active at a time.
   • ThreadHelper: A utility to provide information about the current thread context, used extensively in log messages.

5. Refactoring and Code Quality:

   • Improved error handling in the WebView and WebViewModel, including setting and resetting errors.
   • Refactored WebViewNavigationDelegate to handle caching decisions and navigation actions more precisely.
   • Added a new alert mechanism in ContentView to display errors to users.

6. Cache Management:

   • Enhanced cache management logic in CacheManager with additional logging and concurrency handling.
   • Asynchronous caching operations to improve performance.

Overall, this PR significantly improves the thread safety, logging, and resource management of the iOS web view component, making it more robust and maintainable. If you have specific questions about how to enhance or modify certain parts of the code, feel free to ask!

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DeputyDev generated PR summary until 8b423b1

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[deputydev-agent]

SECURITY: The navigation delegate doesn't validate or sanitize incoming URLs before processing them, which could potentially lead to malicious URL handling. This is a High severity issue as it could allow phishing attacks or navigation to malicious websites.

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    guard let url = navigationAction.request.url else {
        logger.info("⚠️ [\(ThreadHelper.currentThreadInfo())] No URL in navigation action")
        decisionHandler(.cancel)
        return
    }
    
    // Validate URL
    guard isValidURL(url) else {
        logger.warning("🚫 [\(ThreadHelper.currentThreadInfo())] Invalid URL: \(url.absoluteString)")
        decisionHandler(.cancel)
        return
    }
    
    // Rest of the existing code...
}

private func isValidURL(_ url: URL) -> Bool {
    // Implement URL validation logic here
    // For example, check against a whitelist of allowed domains
    let allowedDomains = ["example.com", "api.example.com"]
    return allowedDomains.contains(url.host ?? "")
}

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