Re-add pi-web-access

pi/files/agent/extensions/pi-web-access/activity.ts

@@ -0,0 +1,102 @@
+// Types
+export interface ActivityEntry {
+	id: string;
+	type: "api" | "fetch";
+	startTime: number;
+	endTime?: number;
+
+	// For API calls
+	query?: string;
+
+	// For URL fetches
+	url?: string;
+
+	// Result - status is number (HTTP code) or null (pending/network error)
+	status: number | null;
+	error?: string;
+}
+
+export interface RateLimitInfo {
+	used: number;
+	max: number;
+	oldestTimestamp: number | null;
+	windowMs: number;
+}
+
+export class ActivityMonitor {
+	private entries: ActivityEntry[] = [];
+	private readonly maxEntries = 10;
+	private listeners = new Set<() => void>();
+	private rateLimitInfo: RateLimitInfo = { used: 0, max: 10, oldestTimestamp: null, windowMs: 60000 };
+	private nextId = 1;
+
+	logStart(partial: Omit<ActivityEntry, "id" | "startTime" | "status">): string {
+		const id = `act-${this.nextId++}`;
+		const entry: ActivityEntry = {
+			...partial,
+			id,
+			startTime: Date.now(),
+			status: null,
+		};
+		this.entries.push(entry);
+		if (this.entries.length > this.maxEntries) {
+			this.entries.shift();
+		}
+		this.notify();
+		return id;
+	}
+
+	logComplete(id: string, status: number): void {
+		const entry = this.entries.find((e) => e.id === id);
+		if (entry) {
+			entry.endTime = Date.now();
+			entry.status = status;
+			this.notify();
+		}
+	}
+
+	logError(id: string, error: string): void {
+		const entry = this.entries.find((e) => e.id === id);
+		if (entry) {
+			entry.endTime = Date.now();
+			entry.error = error;
+			this.notify();
+		}
+	}
+
+	getEntries(): readonly ActivityEntry[] {
+		return this.entries;
+	}
+
+	getRateLimitInfo(): RateLimitInfo {
+		return this.rateLimitInfo;
+	}
+
+	updateRateLimit(info: RateLimitInfo): void {
+		this.rateLimitInfo = info;
+		this.notify();
+	}
+
+	onUpdate(callback: () => void): () => void {
+		this.listeners.add(callback);
+		return () => this.listeners.delete(callback);
+	}
+
+	clear(): void {
+		this.entries = [];
+		this.rateLimitInfo = { used: 0, max: 10, oldestTimestamp: null, windowMs: 60000 };
+		this.notify();
+	}
+
+	private notify(): void {
+		for (const cb of this.listeners) {
+			try {
+				cb();
+			} catch {
+				/* ignore */
+			}
+		}
+	}
+}
+
+export const activityMonitor = new ActivityMonitor();