fix: handle Discord gateway metadata fetch failures (#44397)

Merged via squash.

Prepared head SHA: edd17c0eff
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

CHANGELOG.md

@@ -87,6 +87,7 @@ Docs: https://docs.openclaw.ai
 - ACP/client final-message delivery: preserve terminal assistant text snapshots before resolving `end_turn`, so ACP clients no longer drop the last visible reply when the gateway sends the final message body on the terminal chat event. (#17615) Thanks @pjeby.
 - Telegram/Discord status reactions: show a temporary compacting reaction during auto-compaction pauses and restore thinking afterward so the bot no longer appears frozen while context is being compacted. (#35474) thanks @Cypherm.
 - Agents/compaction: compare post-compaction token sanity checks against full-session pre-compaction totals and skip the check when token estimation fails, so sessions with large bootstrap context keep real token counts instead of falling back to unknown. (#28347) thanks @efe-arv.
+- Discord/gateway startup: treat plain-text and transient `/gateway/bot` metadata fetch failures as transient startup errors so Discord gateway boot no longer crashes on unhandled rejections. (#44397) Thanks @jalehman.
 
 ## 2026.3.11
 

src/discord/monitor/gateway-plugin.ts

@@ -7,6 +7,18 @@ import type { DiscordAccountConfig } from "../../config/types.js";
 import { danger } from "../../globals.js";
 import type { RuntimeEnv } from "../../runtime.js";
 
+const DISCORD_GATEWAY_BOT_URL = "https://discord.com/api/v10/gateway/bot";
+const DEFAULT_DISCORD_GATEWAY_URL = "wss://gateway.discord.gg/";
+
+type DiscordGatewayMetadataResponse = Pick<Response, "ok" | "status" | "text">;
+type DiscordGatewayFetchInit = Record<string, unknown> & {
+  headers?: Record<string, string>;
+};
+type DiscordGatewayFetch = (
+  input: string,
+  init?: DiscordGatewayFetchInit,
+) => Promise<DiscordGatewayMetadataResponse>;
+
 export function resolveDiscordGatewayIntents(
   intentsConfig?: import("../../config/types.discord.js").DiscordIntentsConfig,
 ): number {
@@ -27,6 +39,138 @@ export function resolveDiscordGatewayIntents(
   return intents;
 }
 
+function summarizeGatewayResponseBody(body: string): string {
+  const normalized = body.trim().replace(/\s+/g, " ");
+  if (!normalized) {
+    return "<empty>";
+  }
+  return normalized.slice(0, 240);
+}
+
+function isTransientDiscordGatewayResponse(status: number, body: string): boolean {
+  if (status >= 500) {
+    return true;
+  }
+  const normalized = body.toLowerCase();
+  return (
+    normalized.includes("upstream connect error") ||
+    normalized.includes("disconnect/reset before headers") ||
+    normalized.includes("reset reason:")
+  );
+}
+
+function createGatewayMetadataError(params: {
+  detail: string;
+  transient: boolean;
+  cause?: unknown;
+}): Error {
+  if (params.transient) {
+    return new Error("Failed to get gateway information from Discord: fetch failed", {
+      cause: params.cause ?? new Error(params.detail),
+    });
+  }
+  return new Error(`Failed to get gateway information from Discord: ${params.detail}`, {
+    cause: params.cause,
+  });
+}
+
+async function fetchDiscordGatewayInfo(params: {
+  token: string;
+  fetchImpl: DiscordGatewayFetch;
+  fetchInit?: DiscordGatewayFetchInit;
+}): Promise<APIGatewayBotInfo> {
+  let response: DiscordGatewayMetadataResponse;
+  try {
+    response = await params.fetchImpl(DISCORD_GATEWAY_BOT_URL, {
+      ...params.fetchInit,
+      headers: {
+        ...params.fetchInit?.headers,
+        Authorization: `Bot ${params.token}`,
+      },
+    });
+  } catch (error) {
+    throw createGatewayMetadataError({
+      detail: error instanceof Error ? error.message : String(error),
+      transient: true,
+      cause: error,
+    });
+  }
+
+  let body: string;
+  try {
+    body = await response.text();
+  } catch (error) {
+    throw createGatewayMetadataError({
+      detail: error instanceof Error ? error.message : String(error),
+      transient: true,
+      cause: error,
+    });
+  }
+  const summary = summarizeGatewayResponseBody(body);
+  const transient = isTransientDiscordGatewayResponse(response.status, body);
+
+  if (!response.ok) {
+    throw createGatewayMetadataError({
+      detail: `Discord API /gateway/bot failed (${response.status}): ${summary}`,
+      transient,
+    });
+  }
+
+  try {
+    const parsed = JSON.parse(body) as Partial<APIGatewayBotInfo>;
+    return {
+      ...parsed,
+      url:
+        typeof parsed.url === "string" && parsed.url.trim()
+          ? parsed.url
+          : DEFAULT_DISCORD_GATEWAY_URL,
+    } as APIGatewayBotInfo;
+  } catch (error) {
+    throw createGatewayMetadataError({
+      detail: `Discord API /gateway/bot returned invalid JSON: ${summary}`,
+      transient,
+      cause: error,
+    });
+  }
+}
+
+function createGatewayPlugin(params: {
+  options: {
+    reconnect: { maxAttempts: number };
+    intents: number;
+    autoInteractions: boolean;
+  };
+  fetchImpl: DiscordGatewayFetch;
+  fetchInit?: DiscordGatewayFetchInit;
+  wsAgent?: HttpsProxyAgent<string>;
+}): GatewayPlugin {
+  class SafeGatewayPlugin extends GatewayPlugin {
+    constructor() {
+      super(params.options);
+    }
+
+    override async registerClient(client: Parameters<GatewayPlugin["registerClient"]>[0]) {
+      if (!this.gatewayInfo) {
+        this.gatewayInfo = await fetchDiscordGatewayInfo({
+          token: client.options.token,
+          fetchImpl: params.fetchImpl,
+          fetchInit: params.fetchInit,
+        });
+      }
+      return super.registerClient(client);
+    }
+
+    override createWebSocket(url: string) {
+      if (!params.wsAgent) {
+        return super.createWebSocket(url);
+      }
+      return new WebSocket(url, { agent: params.wsAgent });
+    }
+  }
+
+  return new SafeGatewayPlugin();
+}
+
 export function createDiscordGatewayPlugin(params: {
   discordConfig: DiscordAccountConfig;
   runtime: RuntimeEnv;
@@ -40,7 +184,10 @@ export function createDiscordGatewayPlugin(params: {
   };
 
   if (!proxy) {
-    return new GatewayPlugin(options);
+    return createGatewayPlugin({
+      options,
+      fetchImpl: (input, init) => fetch(input, init as RequestInit),
+    });
   }
 
   try {
@@ -49,39 +196,17 @@ export function createDiscordGatewayPlugin(params: {
 
     params.runtime.log?.("discord: gateway proxy enabled");
 
-    class ProxyGatewayPlugin extends GatewayPlugin {
-      constructor() {
-        super(options);
-      }
-
-      override async registerClient(client: Parameters<GatewayPlugin["registerClient"]>[0]) {
-        if (!this.gatewayInfo) {
-          try {
-            const response = await undiciFetch("https://discord.com/api/v10/gateway/bot", {
-              headers: {
-                Authorization: `Bot ${client.options.token}`,
-              },
-              dispatcher: fetchAgent,
-            } as Record<string, unknown>);
-            this.gatewayInfo = (await response.json()) as APIGatewayBotInfo;
-          } catch (error) {
-            throw new Error(
-              `Failed to get gateway information from Discord: ${error instanceof Error ? error.message : String(error)}`,
-              { cause: error },
-            );
-          }
-        }
-        return super.registerClient(client);
-      }
-
-      override createWebSocket(url: string) {
-        return new WebSocket(url, { agent: wsAgent });
-      }
-    }
-
-    return new ProxyGatewayPlugin();
+    return createGatewayPlugin({
+      options,
+      fetchImpl: (input, init) => undiciFetch(input, init),
+      fetchInit: { dispatcher: fetchAgent },
+      wsAgent,
+    });
   } catch (err) {
     params.runtime.error?.(danger(`discord: invalid gateway proxy: ${String(err)}`));
-    return new GatewayPlugin(options);
+    return createGatewayPlugin({
+      options,
+      fetchImpl: (input, init) => fetch(input, init as RequestInit),
+    });
   }
 }

src/discord/monitor/provider.proxy.test.ts

@@ -4,6 +4,7 @@ const {
   GatewayIntents,
   baseRegisterClientSpy,
   GatewayPlugin,
+  globalFetchMock,
   HttpsProxyAgent,
   getLastAgent,
   restProxyAgentSpy,
@@ -17,6 +18,7 @@ const {
   const undiciProxyAgentSpy = vi.fn();
   const restProxyAgentSpy = vi.fn();
   const undiciFetchMock = vi.fn();
+  const globalFetchMock = vi.fn();
   const baseRegisterClientSpy = vi.fn();
   const webSocketSpy = vi.fn();
 
@@ -60,6 +62,7 @@ const {
     baseRegisterClientSpy,
     GatewayIntents,
     GatewayPlugin,
+    globalFetchMock,
     HttpsProxyAgent,
     getLastAgent: () => HttpsProxyAgent.lastCreated,
     restProxyAgentSpy,
@@ -121,7 +124,9 @@ describe("createDiscordGatewayPlugin", () => {
   }
 
   beforeEach(() => {
+    vi.stubGlobal("fetch", globalFetchMock);
     baseRegisterClientSpy.mockClear();
+    globalFetchMock.mockClear();
     restProxyAgentSpy.mockClear();
     undiciFetchMock.mockClear();
     undiciProxyAgentSpy.mockClear();
@@ -130,6 +135,60 @@ describe("createDiscordGatewayPlugin", () => {
     resetLastAgent();
   });
 
+  it("uses safe gateway metadata lookup without proxy", async () => {
+    const runtime = createRuntime();
+    globalFetchMock.mockResolvedValue({
+      ok: true,
+      status: 200,
+      text: async () => JSON.stringify({ url: "wss://gateway.discord.gg" }),
+    } as Response);
+    const plugin = createDiscordGatewayPlugin({
+      discordConfig: {},
+      runtime,
+    });
+
+    await (
+      plugin as unknown as {
+        registerClient: (client: { options: { token: string } }) => Promise<void>;
+      }
+    ).registerClient({
+      options: { token: "token-123" },
+    });
+
+    expect(globalFetchMock).toHaveBeenCalledWith(
+      "https://discord.com/api/v10/gateway/bot",
+      expect.objectContaining({
+        headers: { Authorization: "Bot token-123" },
+      }),
+    );
+    expect(baseRegisterClientSpy).toHaveBeenCalledTimes(1);
+  });
+
+  it("maps plain-text Discord 503 responses to fetch failed", async () => {
+    const runtime = createRuntime();
+    globalFetchMock.mockResolvedValue({
+      ok: false,
+      status: 503,
+      text: async () =>
+        "upstream connect error or disconnect/reset before headers. reset reason: overflow",
+    } as Response);
+    const plugin = createDiscordGatewayPlugin({
+      discordConfig: {},
+      runtime,
+    });
+
+    await expect(
+      (
+        plugin as unknown as {
+          registerClient: (client: { options: { token: string } }) => Promise<void>;
+        }
+      ).registerClient({
+        options: { token: "token-123" },
+      }),
+    ).rejects.toThrow("Failed to get gateway information from Discord: fetch failed");
+    expect(baseRegisterClientSpy).not.toHaveBeenCalled();
+  });
+
   it("uses proxy agent for gateway WebSocket when configured", async () => {
     const runtime = createRuntime();
 
@@ -161,7 +220,7 @@ describe("createDiscordGatewayPlugin", () => {
       runtime,
     });
 
-    expect(Object.getPrototypeOf(plugin)).toBe(GatewayPlugin.prototype);
+    expect(Object.getPrototypeOf(plugin)).not.toBe(GatewayPlugin.prototype);
     expect(runtime.error).toHaveBeenCalled();
     expect(runtime.log).not.toHaveBeenCalled();
   });
@@ -169,7 +228,9 @@ describe("createDiscordGatewayPlugin", () => {
   it("uses proxy fetch for gateway metadata lookup before registering", async () => {
     const runtime = createRuntime();
     undiciFetchMock.mockResolvedValue({
-      json: async () => ({ url: "wss://gateway.discord.gg" }),
+      ok: true,
+      status: 200,
+      text: async () => JSON.stringify({ url: "wss://gateway.discord.gg" }),
     } as Response);
     const plugin = createDiscordGatewayPlugin({
       discordConfig: { proxy: "http://proxy.test:8080" },
@@ -194,4 +255,30 @@ describe("createDiscordGatewayPlugin", () => {
     );
     expect(baseRegisterClientSpy).toHaveBeenCalledTimes(1);
   });
+
+  it("maps body read failures to fetch failed", async () => {
+    const runtime = createRuntime();
+    globalFetchMock.mockResolvedValue({
+      ok: true,
+      status: 200,
+      text: async () => {
+        throw new Error("body stream closed");
+      },
+    } as unknown as Response);
+    const plugin = createDiscordGatewayPlugin({
+      discordConfig: {},
+      runtime,
+    });
+
+    await expect(
+      (
+        plugin as unknown as {
+          registerClient: (client: { options: { token: string } }) => Promise<void>;
+        }
+      ).registerClient({
+        options: { token: "token-123" },
+      }),
+    ).rejects.toThrow("Failed to get gateway information from Discord: fetch failed");
+    expect(baseRegisterClientSpy).not.toHaveBeenCalled();
+  });
 });

src/infra/unhandled-rejections.test.ts

@@ -130,6 +130,13 @@ describe("isTransientNetworkError", () => {
     expect(isTransientNetworkError(error)).toBe(true);
   });
 
+  it("returns true for wrapped Discord upstream-connect parse failures", () => {
+    const error = new Error(
+      `Failed to get gateway information from Discord: Unexpected token 'u', "upstream connect error or disconnect/reset before headers. reset reason: overflow" is not valid JSON`,
+    );
+    expect(isTransientNetworkError(error)).toBe(true);
+  });
+
   it("returns false for non-network fetch-failed wrappers from tools", () => {
     const error = new Error("Web fetch failed (404): Not Found");
     expect(isTransientNetworkError(error)).toBe(false);

src/infra/unhandled-rejections.ts

@@ -61,6 +61,8 @@ const TRANSIENT_NETWORK_MESSAGE_SNIPPETS = [
   "network error",
   "network is unreachable",
   "temporary failure in name resolution",
+  "upstream connect error",
+  "disconnect/reset before headers",
   "tlsv1 alert",
   "ssl routines",
   "packet length too long",