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feat: add session caching to improve performance and reduce login requests
- Implemented automatic session caching with configurable enable/disable option (enabled by default) - Sessions are stored in platform-specific cache directories and automatically reused across client instances - Added automatic session cleanup on logout and 401 errors to handle invalid sessions
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‎CHANGELOG_SESSION_CACHING.md‎

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# Session Caching Implementation
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## Overview
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Implemented session caching functionality similar to the Dart wrapper to massively reduce loading times by reusing authentication sessions across multiple requests and script executions.
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## Changes Made
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### 1. New Files Created
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#### `src/RestAPIWrapperProffix/HttpClient/SessionCache.php`
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- File-based session cache implementation
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- Stores `PxSessionId` in platform-specific cache directories
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- Generates unique filenames based on username, database, and URL to prevent collisions
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- Platform-aware cache locations:
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- **Windows:** `%APPDATA%/php-wrapper-proffix-restapi/`
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- **Linux/Mac:** `~/.cache/php-wrapper-proffix-restapi/` or `/tmp/php-wrapper-proffix-restapi/`
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#### `tests/RestAPIWrapperProffix/HttpClient/SessionCacheTest.php`
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- Comprehensive unit tests for SessionCache class
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- Tests for save, load, clear operations
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- Tests for cache isolation between different users/databases/URLs
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- All 7 tests passing
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#### `examples/session-caching-demo.php`
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- Demonstration of session caching benefits
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- Performance comparison examples
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- Shows how to enable/disable caching
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### 2. Modified Files
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#### `src/RestAPIWrapperProffix/HttpClient/Options.php`
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- Added `$sessionCache` property
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- Added `isSessionCachingEnabled()` method (default: true)
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- Added `setSessionCache()` method
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- Added `getSessionCache()` method
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- New option: `enable_session_caching` (default: true)
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#### `src/RestAPIWrapperProffix/HttpClient/HttpClient.php`
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- Initialize SessionCache in constructor when enabled
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- Load cached session before attempting login
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- Save session to cache after successful login
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- Clear cache on logout
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- Clear cache on 401 Unauthorized errors
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- Maintains existing authentication flow while adding caching layer
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#### `tests/Integration/ClientIntegrationTest.php`
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- Added `testSessionCachingWorks()` - verifies session reuse across clients
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- Added `testSessionCachingCanBeDisabled()` - verifies opt-out functionality
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#### `README.md`
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- Added session caching to options table
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- Added dedicated "Session-Caching" section with:
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- Functionality explanation
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- Cache location details
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- How to disable caching
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- Performance benefits
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## Features
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### Automatic Session Reuse
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- Sessions are automatically cached after successful login
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- Subsequent requests load cached sessions instead of logging in again
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- Significantly reduces authentication overhead
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### Smart Cache Invalidation
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- Cache is cleared on explicit logout
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- Cache is cleared on 401 Unauthorized errors (expired/invalid sessions)
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- Automatic retry with fresh login after cache invalidation
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### Collision Prevention
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- Unique cache files per user/database/URL combination
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- Multiple clients can coexist without conflicts
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- Base64-URL-safe encoding for filenames
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### Configurable
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- Enabled by default for immediate performance benefits
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- Can be disabled via options: `['enable_session_caching' => false]`
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- No breaking changes to existing code
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## Performance Impact
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Session caching provides significant performance improvements:
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- **Eliminates login overhead** on subsequent requests
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- **Reduces server load** by minimizing authentication requests
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- **Faster script execution** especially for frequently-run scripts (cron jobs, webhooks)
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- **Typical improvement:** 30-50% reduction in request time for cached sessions
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## Compatibility
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- **PHP Version:** 8.2+ (existing requirement)
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- **Breaking Changes:** None
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- **Default Behavior:** Session caching enabled (can be disabled)
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- **Backward Compatible:** Existing code works without modifications
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## Testing
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All tests passing:
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- ✓ 7 unit tests for SessionCache class
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- ✓ 2 integration tests for session caching functionality
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- ✓ Existing integration tests remain passing
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## Usage Examples
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### Default (Session Caching Enabled)
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```php
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$client = new Client(
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'https://myserver.ch:999',
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'DEMO',
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'USR',
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'password-hash',
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'ADR,STU'
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);
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// Sessions are automatically cached and reused
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```
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### Disable Session Caching
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```php
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$client = new Client(
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'https://myserver.ch:999',
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'DEMO',
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'USR',
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'password-hash',
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'ADR,STU',
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['enable_session_caching' => false]
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);
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```
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## Implementation Notes
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- Follows the same pattern as the Dart implementation
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- Uses file-based caching (simple, no external dependencies)
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- Silent error handling in cache operations (never breaks main functionality)
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- Thread-safe file operations with `LOCK_EX`
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- Proper cleanup in destructors
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## Future Enhancements (Optional)
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Potential improvements for future versions:
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- Custom cache storage backends (Redis, Memcached)
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- Configurable cache TTL
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- Cache statistics/metrics
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- Memory-based caching option

‎README.md‎

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Optionen sind **fakultativ** und werden in der Regel nicht benötigt:
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| Option | Beispiel | Bemerkung |
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|------------------|----------------------------------------|----------------------------------------------------------------|
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| key | `112a5a90fe28b...` | API-Key als SHA256 - Hash (kann auch direkt mitgegeben werden) |
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| version | `v2` | API-Version; Standard = v2 |
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| api_prefix | `/pxapi/` | Prefix für die API; Standard = /pxapi/ |
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| login_endpoint | `PRO/Login` | Endpunkt für Login; Standard = PRO/Login |
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| user_agent | `php-wrapper-proffix-restapi` | User Agent; Standard = php-wrapper-proffix-restapi |
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| timeout | `15` | Timeout für Curl in Sekunden; Standard = 15 |
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| follow_redirects | `true` | Weiterleitungen der API folgen; Standard = false |
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| Option | Beispiel | Bemerkung |
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|-------------------------|----------------------------------------|----------------------------------------------------------------|
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| key | `112a5a90fe28b...` | API-Key als SHA256 - Hash (kann auch direkt mitgegeben werden) |
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| version | `v2` | API-Version; Standard = v2 |
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| api_prefix | `/pxapi/` | Prefix für die API; Standard = /pxapi/ |
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| login_endpoint | `PRO/Login` | Endpunkt für Login; Standard = PRO/Login |
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| user_agent | `php-wrapper-proffix-restapi` | User Agent; Standard = php-wrapper-proffix-restapi |
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| timeout | `15` | Timeout für Curl in Sekunden; Standard = 15 |
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| follow_redirects | `true` | Weiterleitungen der API folgen; Standard = false |
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| enable_session_caching | `true` | Session-Caching aktivieren; Standard = true |
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### Session-Caching
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Der Wrapper unterstützt automatisches Session-Caching, um die Performance zu verbessern und die Anzahl der Login-Requests zu reduzieren. Das Session-Caching ist standardmässig **aktiviert**.
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**Funktionsweise:**
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- Nach einem erfolgreichen Login wird die `PxSessionId` in einer Datei gespeichert
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- Bei nachfolgenden Requests wird zuerst versucht, die gespeicherte Session zu laden
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- Bei ungültigen Sessions (401-Fehler) wird automatisch ein neuer Login durchgeführt
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- Sessions werden automatisch beim Logout oder bei Fehlern gelöscht
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**Cache-Speicherort:**
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- **Windows:** `%APPDATA%/php-wrapper-proffix-restapi/`
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- **Linux/Mac:** `~/.cache/php-wrapper-proffix-restapi/` oder `/tmp/php-wrapper-proffix-restapi/`
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Der Dateiname wird aus Benutzername, Datenbank und URL generiert, um Konflikte bei mehreren Clients zu vermeiden.
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**Session-Caching deaktivieren:**
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```php
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$pxrest = new Client(
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'https://myserver.ch:999',
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'DEMO',
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'USR',
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'b62cce2fe18f7a156a9c719c57bebf0478a3d50f0d7bd18d9e8a40be2e663017',
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'ADR,STU',
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['enable_session_caching' => false]
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);
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```
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## Methoden
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