feat: show connection state, bot, message counters and last activity in the omp status line

lib/traffic.ts

@@ -0,0 +1,115 @@
+/**
+ * Telegram bridge traffic counters
+ * Zones: telegram transport, status
+ * Owns in-memory received/sent message counts and last-activity time for the status bar
+ *
+ * This domain is pure: it counts, it does not read config, call Telegram, or import other domains.
+ */
+
+export interface TelegramTrafficSnapshot {
+  /** Authorized messages received from the paired owner since the bridge loaded. */
+  received: number;
+  /** Messages the bridge delivered to Telegram since the bridge loaded. */
+  sent: number;
+  /** Time of the latest received or sent message, when there was one. */
+  lastAtMs?: number;
+}
+
+export interface TelegramTrafficCounters {
+  recordReceived: () => void;
+  recordSent: () => void;
+  snapshot: () => TelegramTrafficSnapshot;
+}
+
+/**
+ * Bot API methods that deliver a message the owner can read. Typing actions,
+ * drafts, edits, reactions and callback answers are not messages.
+ */
+const TELEGRAM_OUTBOUND_MESSAGE_METHODS: Readonly<Record<string, true>> = {
+  sendMessage: true,
+  sendRichMessage: true,
+  sendPhoto: true,
+  sendDocument: true,
+  sendAudio: true,
+  sendVideo: true,
+  sendVoice: true,
+  sendAnimation: true,
+  sendVideoNote: true,
+  sendMediaGroup: true,
+  sendSticker: true,
+};
+
+export function isTelegramOutboundMessageMethod(method: string): boolean {
+  return Object.hasOwn(TELEGRAM_OUTBOUND_MESSAGE_METHODS, method);
+}
+
+export function createTelegramTrafficCounters(
+  now: () => number = Date.now,
+): TelegramTrafficCounters {
+  let received = 0;
+  let sent = 0;
+  let lastAtMs: number | undefined;
+  return {
+    recordReceived() {
+      received += 1;
+      lastAtMs = now();
+    },
+    recordSent() {
+      sent += 1;
+      lastAtMs = now();
+    },
+    snapshot: () => ({
+      received,
+      sent,
+      ...(lastAtMs === undefined ? {} : { lastAtMs }),
+    }),
+  };
+}
+
+export interface TelegramTrafficStatusBridgeDeps<TContext> {
+  counters: TelegramTrafficCounters;
+  /** Current session context, when the bridge has one. */
+  getContext: () => TContext | undefined;
+  updateStatus: (ctx: TContext) => void;
+  recordRuntimeEvent: (
+    category: string,
+    error: unknown,
+    details?: Record<string, unknown>,
+  ) => void;
+}
+
+export interface TelegramTrafficStatusBridge<TContext> {
+  /** Observer for successful Bot API calls; counts delivered messages. */
+  onCallSucceeded: (method: string) => void;
+  /** Observer for messages accepted from the paired owner. */
+  onAuthorizedMessage: (ctx: TContext) => void;
+}
+
+/**
+ * Counts traffic and refreshes the status bar so the counters stay current. A
+ * status refresh failure (for example a stale session context) is recorded and
+ * never propagates into the send or receive path that triggered it.
+ */
+export function createTelegramTrafficStatusBridge<TContext>(
+  deps: TelegramTrafficStatusBridgeDeps<TContext>,
+): TelegramTrafficStatusBridge<TContext> {
+  const refreshStatus = (ctx: TContext): void => {
+    try {
+      deps.updateStatus(ctx);
+    } catch (error) {
+      deps.recordRuntimeEvent("status", error, { phase: "traffic-refresh" });
+    }
+  };
+  return {
+    onCallSucceeded(method) {
+      if (!isTelegramOutboundMessageMethod(method)) return;
+      deps.counters.recordSent();
+      const ctx = deps.getContext();
+      if (ctx !== undefined) refreshStatus(ctx);
+    },
+    onAuthorizedMessage(ctx) {
+      deps.counters.recordReceived();
+      refreshStatus(ctx);
+    },
+  };
+}