feat: implement request monitoring and queuing services to manage concurrent requests to Komga

src/lib/services/request-monitor.service.ts

@@ -0,0 +1,44 @@
+/**
+ * Service de monitoring des requêtes concurrentes vers Komga
+ * Permet de tracker le nombre de requêtes actives et d'alerter en cas de charge élevée
+ */
+class RequestMonitor {
+  private activeRequests = 0;
+  private readonly thresholds = {
+    warning: 10,
+    high: 20,
+    critical: 30,
+  };
+
+  incrementActive(): number {
+    this.activeRequests++;
+    this.checkThresholds();
+    return this.activeRequests;
+  }
+
+  decrementActive(): number {
+    this.activeRequests = Math.max(0, this.activeRequests - 1);
+    return this.activeRequests;
+  }
+
+  getActiveCount(): number {
+    return this.activeRequests;
+  }
+
+  private checkThresholds(): void {
+    const count = this.activeRequests;
+    
+    if (count >= this.thresholds.critical) {
+      console.warn(`[REQUEST-MONITOR] 🔴 CRITICAL concurrency: ${count} active requests`);
+    } else if (count >= this.thresholds.high) {
+      console.warn(`[REQUEST-MONITOR] ⚠️  HIGH concurrency: ${count} active requests`);
+    } else if (count >= this.thresholds.warning) {
+      console.log(`[REQUEST-MONITOR] ⚡ Warning concurrency: ${count} active requests`);
+    }
+  }
+}
+
+// Singleton instance
+export const RequestMonitorService = new RequestMonitor();
+
+