fix(discord): log gateway reconnects

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);
+  };
+}