fix(discord): log gateway reconnects

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Slack: honor reply tags + replyToMode while keeping threaded replies in-thread. (#574) — thanks @bolismauro
 - Discord: avoid category parent overrides for channel allowlists and refactor thread context helpers. (#588) — thanks @steipete
 - Discord: fix forum thread starters and cache channel lookups for thread context. (#585) — thanks @thewilloftheshadow
+- Discord: log gateway disconnect/reconnect events at info and add verbose gateway metrics. (#595) — thanks @steipete
 - Commands: accept /models as an alias for /model.
 - Commands: add `/usage` as an alias for `/status`. (#492) — thanks @lc0rp
 - Models/Auth: add MiniMax Anthropic-compatible API onboarding (minimax-api). (#590) — thanks @mneves75

src/discord/gateway-logging.test.ts

@@ -0,0 +1,88 @@
+import { EventEmitter } from "node:events";
+
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("../globals.js", () => ({
+  logVerbose: vi.fn(),
+}));
+
+import { logVerbose } from "../globals.js";
+import { attachDiscordGatewayLogging } from "./gateway-logging.js";
+
+const makeRuntime = () => ({
+  log: vi.fn(),
+});
+
+describe("attachDiscordGatewayLogging", () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("logs debug events and promotes reconnect/close to info", () => {
+    const emitter = new EventEmitter();
+    const runtime = makeRuntime();
+
+    const cleanup = attachDiscordGatewayLogging({
+      emitter,
+      runtime,
+    });
+
+    emitter.emit("debug", "WebSocket connection opened");
+    emitter.emit("debug", "WebSocket connection closed with code 1001");
+    emitter.emit("debug", "Reconnecting with backoff: 1000ms after code 1001");
+
+    const logVerboseMock = vi.mocked(logVerbose);
+    expect(logVerboseMock).toHaveBeenCalledTimes(3);
+    expect(runtime.log).toHaveBeenCalledTimes(2);
+    expect(runtime.log).toHaveBeenNthCalledWith(
+      1,
+      "discord gateway: WebSocket connection closed with code 1001",
+    );
+    expect(runtime.log).toHaveBeenNthCalledWith(
+      2,
+      "discord gateway: Reconnecting with backoff: 1000ms after code 1001",
+    );
+
+    cleanup();
+  });
+
+  it("logs warnings and metrics only to verbose", () => {
+    const emitter = new EventEmitter();
+    const runtime = makeRuntime();
+
+    const cleanup = attachDiscordGatewayLogging({
+      emitter,
+      runtime,
+    });
+
+    emitter.emit("warning", "High latency detected: 1200ms");
+    emitter.emit("metrics", { latency: 42, errors: 1 });
+
+    const logVerboseMock = vi.mocked(logVerbose);
+    expect(logVerboseMock).toHaveBeenCalledTimes(2);
+    expect(runtime.log).not.toHaveBeenCalled();
+
+    cleanup();
+  });
+
+  it("removes listeners on cleanup", () => {
+    const emitter = new EventEmitter();
+    const runtime = makeRuntime();
+
+    const cleanup = attachDiscordGatewayLogging({
+      emitter,
+      runtime,
+    });
+    cleanup();
+
+    const logVerboseMock = vi.mocked(logVerbose);
+    logVerboseMock.mockClear();
+
+    emitter.emit("debug", "WebSocket connection closed with code 1001");
+    emitter.emit("warning", "High latency detected: 1200ms");
+    emitter.emit("metrics", { latency: 42 });
+
+    expect(logVerboseMock).not.toHaveBeenCalled();
+    expect(runtime.log).not.toHaveBeenCalled();
+  });
+});

src/discord/gateway-logging.ts

@@ -0,0 +1,66 @@
+import type { EventEmitter } from "node:events";
+
+import { logVerbose } from "../globals.js";
+import type { RuntimeEnv } from "../runtime.js";
+
+type GatewayEmitter = Pick<EventEmitter, "on" | "removeListener">;
+
+const INFO_DEBUG_MARKERS = [
+  "WebSocket connection closed",
+  "Reconnecting with backoff",
+  "Attempting resume with backoff",
+];
+
+const shouldPromoteGatewayDebug = (message: string) =>
+  INFO_DEBUG_MARKERS.some((marker) => message.includes(marker));
+
+const formatGatewayMetrics = (metrics: unknown) => {
+  if (metrics === null || metrics === undefined) return String(metrics);
+  if (typeof metrics === "string") return metrics;
+  if (
+    typeof metrics === "number" ||
+    typeof metrics === "boolean" ||
+    typeof metrics === "bigint"
+  ) {
+    return String(metrics);
+  }
+  try {
+    return JSON.stringify(metrics);
+  } catch {
+    return "[unserializable metrics]";
+  }
+};
+
+export function attachDiscordGatewayLogging(params: {
+  emitter?: GatewayEmitter;
+  runtime: RuntimeEnv;
+}) {
+  const { emitter, runtime } = params;
+  if (!emitter) return () => {};
+
+  const onGatewayDebug = (msg: unknown) => {
+    const message = String(msg);
+    logVerbose(`discord gateway: ${message}`);
+    if (shouldPromoteGatewayDebug(message)) {
+      runtime.log?.(`discord gateway: ${message}`);
+    }
+  };
+
+  const onGatewayWarning = (warning: unknown) => {
+    logVerbose(`discord gateway warning: ${String(warning)}`);
+  };
+
+  const onGatewayMetrics = (metrics: unknown) => {
+    logVerbose(`discord gateway metrics: ${formatGatewayMetrics(metrics)}`);
+  };
+
+  emitter.on("debug", onGatewayDebug);
+  emitter.on("warning", onGatewayWarning);
+  emitter.on("metrics", onGatewayMetrics);
+
+  return () => {
+    emitter.removeListener("debug", onGatewayDebug);
+    emitter.removeListener("warning", onGatewayWarning);
+    emitter.removeListener("metrics", onGatewayMetrics);
+  };
+}

src/discord/monitor.ts

@@ -68,6 +68,7 @@ import { truncateUtf16Safe } from "../utils.js";
 import { loadWebMedia } from "../web/media.js";
 import { resolveDiscordAccount } from "./accounts.js";
 import { chunkDiscordText } from "./chunk.js";
+import { attachDiscordGatewayLogging } from "./gateway-logging.js";
 import {
   getDiscordGatewayEmitter,
   waitForDiscordGatewayStop,
@@ -499,12 +500,10 @@ export async function monitorDiscordProvider(opts: MonitorDiscordOpts = {}) {
 
   const gateway = client.getPlugin<GatewayPlugin>("gateway");
   const gatewayEmitter = getDiscordGatewayEmitter(gateway);
-  const onGatewayWarning = (warning: unknown) => {
-    logVerbose(`discord gateway warning: ${String(warning)}`);
-  };
-  if (shouldLogVerbose()) {
-    gatewayEmitter?.on("warning", onGatewayWarning);
-  }
+  const stopGatewayLogging = attachDiscordGatewayLogging({
+    emitter: gatewayEmitter,
+    runtime,
+  });
   try {
     await waitForDiscordGatewayStop({
       gateway: gateway
@@ -526,7 +525,7 @@ export async function monitorDiscordProvider(opts: MonitorDiscordOpts = {}) {
       },
     });
   } finally {
-    gatewayEmitter?.removeListener("warning", onGatewayWarning);
+    stopGatewayLogging();
   }
 }