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Add system-fragment.php — a thin authenticated endpoint that returns only the tab-panel HTML (toolbar + meta + log/nginx-config output) for a given ?tab=&n= combination. No page shell, no status section, no DB queries. system.php changes: - Tab <a> elements gain data-tab= attributes used by JS to identify the target without parsing hrefs. - Tab panel content wrapped in <div id=sys-tab-panel data-tab= data-n=> which JS uses as both the swap target and its own state store. - JS rewritten: tab clicks and lines-select changes call loadPanel() which fetch()es system-fragment.php, swaps innerHTML, updates active tab ARIA attributes, and pushes state via history.pushState. - Browser back/forward handled via popstate listener. - bindPanelControls() re-wires the lines-select and copy-to-clipboard button after every innerHTML swap (event delegation not feasible here because log-output is replaced wholesale). - fetch() failure falls back to window.location.href (full page load). - Tabs without JS still work: <a href> links go to system.php?tab=… as before. system-fragment.php: - Requires AdminAuth::isAuthenticated(); returns 403 on failure. - Validates tab and n params against the same whitelist as system.php. - All helper functions namespaced with frag_ prefix to avoid redeclaration if PHP ever includes both files in the same process. - Renders identical HTML to the corresponding section in system.php. system.css: - #sys-tab-panel gets min-height:8rem and position:relative to prevent layout jump during fetch. - .sys-panel-loading: opacity 0.4 + pointer-events:none + subtle diagonal-stripe ::after overlay with shimmer animation.
34 lines
2.0 KiB
Markdown
34 lines
2.0 KiB
Markdown
# System Page Caching - Database-Backed Status Cache
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## Problem
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The admin system page (`/admin/system.php`) runs expensive operations on every load:
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- `systemctl` subprocess calls (~4 checks × ~100ms each)
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- `curl` HTTP self-check (~200-500ms)
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- `disk_total_space()`/`disk_free_space()` (fast but unnecessary per-request)
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- Log file `tail` + `filesize` + `filemtime` (I/O bound)
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- Nginx config file reading
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## Solution: `system_cache` table + background refresh
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- [x] **Add `system_cache` table** to schema: `CREATE TABLE system_cache (key TEXT PRIMARY KEY, value TEXT NOT NULL, updated_at INTEGER NOT NULL)`
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- [x] **Add migration** `storage/migrations/007_system_cache.sql`
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- [x] **Add `SystemCache` class** (`src/SystemCache.php`) with methods:
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- `get(string $key, int $maxAgeSec = 60): ?array`
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- `set(string $key, array $data): void`
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- `isStale(string $key, int $maxAgeSec = 60): bool`
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- [x] **Refactor `system.php` status section**:
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1. Check `SystemCache::get('system_status', 120)` — 2-minute TTL
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2. If cache hit → render from cache, show “mis en cache il y a X sec” label
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3. If cache miss → run checks, store in cache, render
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4. Add `?refresh=1` GET param to force-bypass cache
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- [x] **Refactor `system.php` log sections** — avoid re-reading on every tab switch; only read the active tab’s log
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- [x] **Cache disk info** separately with 5-minute TTL: `SystemCache::get('disk_info', 300)`
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- [x] **Cache PHP info** separately with 1-hour TTL: `SystemCache::get('php_info', 3600)`
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## Notes
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- Log caching deliberately omitted: `tail` output is inherently real-time and caching even 30s would show stale data during the moments it matters most (deploys, errors). The existing tab guard already ensures only the active log file is read.
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- nginx config could be cached but `file()` on a small static config file is negligible; not worth the added complexity.
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- [x] Log tab switching and line-count changes now use `fetch()` via `system-fragment.php`; no full page reload on tab switch.
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