Updated Logging System to Include Application Logs

server/services/appLogs.js

@@ -0,0 +1,58 @@
+const fs = require('fs');
+const { LOG_FILE } = require('../logger');
+
+// Read the application/event log (JSON lines written by the Winston file transport) for the admin
+// Application Logs viewer. Reads the current log file, parses the most recent lines, and returns them
+// newest-first with optional category/level/search filtering plus the available filter facets.
+
+const SCAN_LINES = 8000; // how many trailing lines to parse (the file is size-rotated, ~5MB)
+
+function readLogs(filters = {}, limit = 500) {
+  let lines = [];
+  try {
+    lines = fs.readFileSync(LOG_FILE, 'utf8').split('\n').filter(Boolean);
+  } catch {
+    return { logs: [], total: 0, categories: [], levels: [] };
+  }
+
+  // Parse the trailing window, newest first.
+  const parsed = [];
+  for (let i = lines.length - 1, scanned = 0; i >= 0 && scanned < SCAN_LINES; i -= 1, scanned += 1) {
+    try {
+      const obj = JSON.parse(lines[i]);
+      parsed.push({
+        timestamp: obj.timestamp || null,
+        level: obj.level || 'info',
+        category: obj.category || 'system',
+        message: obj.message || '',
+        meta: stripMeta(obj)
+      });
+    } catch {
+      // skip malformed lines
+    }
+  }
+
+  const categories = [...new Set(parsed.map((p) => p.category))].sort();
+  const levels = [...new Set(parsed.map((p) => p.level))].sort();
+
+  let filtered = parsed;
+  if (filters.category) filtered = filtered.filter((p) => p.category === filters.category);
+  if (filters.level) filtered = filtered.filter((p) => p.level === filters.level);
+  if (filters.q) {
+    const needle = String(filters.q).toLowerCase();
+    filtered = filtered.filter((p) => `${p.message} ${JSON.stringify(p.meta)}`.toLowerCase().includes(needle));
+  }
+
+  return { logs: filtered.slice(0, Math.min(2000, Number(limit) || 500)), total: filtered.length, categories, levels };
+}
+
+// Everything on a log line except the standard fields is "meta" (the structured detail).
+function stripMeta(obj) {
+  const meta = {};
+  for (const [key, value] of Object.entries(obj)) {
+    if (!['timestamp', 'level', 'category', 'message'].includes(key)) meta[key] = value;
+  }
+  return meta;
+}
+
+module.exports = { readLogs };