feat(discord): make gateway optional with REST send path and send logs

Gateway is now an opt-in feature (DISCORD_GATEWAY_ENABLED); when disabled,
messages are delivered via the Discord REST API (discord-rest.ts) instead of
the Durable Object. Record per-route delivery results (send-log.ts) for the
WebUI. Configure assets binding, DO sqlite migration and cron trigger.

src/discord-rest.ts

@@ -0,0 +1,49 @@
+import { log } from "./log";
+
+const DISCORD_API = "https://discord.com/api/v10";
+
+export async function sendMessage(
+  token: string,
+  channelId: string,
+  message: unknown,
+  threadId?: string,
+): Promise<{ ok: boolean; error?: string }> {
+  const url = threadId
+    ? `${DISCORD_API}/channels/${threadId}/messages`
+    : `${DISCORD_API}/channels/${channelId}/messages`;
+
+  for (let attempt = 0; attempt < 3; attempt++) {
+    try {
+      const res = await fetch(url, {
+        method: "POST",
+        headers: {
+          Authorization: `Bot ${token}`,
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify(message),
+      });
+
+      if (res.status === 429) {
+        const rateLimit = (await res.json()) as { retry_after?: number };
+        const retryAfter = (rateLimit.retry_after ?? 1) * 1000;
+        log.warn({ retryAfter, attempt }, "Rate limited");
+        await new Promise((r) => setTimeout(r, retryAfter));
+        continue;
+      }
+
+      if (!res.ok) {
+        const err = await res.text();
+        log.error({ status: res.status, err, channelId }, "Discord API error");
+        return { ok: false, error: err };
+      }
+
+      return { ok: true };
+    } catch (err) {
+      log.error({ err, attempt, channelId }, "Failed to send message");
+      if (attempt === 2) return { ok: false, error: String(err) };
+      await new Promise((r) => setTimeout(r, 1000 * (attempt + 1)));
+    }
+  }
+
+  return { ok: false, error: "Max retries exceeded" };
+}

src/discord.ts

@@ -2,7 +2,13 @@ import type { Config, FormattedMessage, WebhookEvent, Env } from "./types";
 import { formatEvent } from "./formatter";
 import { matchRoute } from "./webhook";
 import { log } from "./log";
-import { loadTranslations } from "./i18n";
+import { loadTranslations, type Translations } from "./i18n";
+import { sendMessage } from "./discord-rest";
+import { recordSend } from "./send-log";
+
+export function isGatewayEnabled(env: Env): boolean {
+  return env.DISCORD_GATEWAY_ENABLED === "true";
+}
 
 async function getGatewayProxy(env: Env): Promise<DurableObjectStub> {
   const id = env.DISCORD_GATEWAY.idFromName("discord-gateway");
@@ -10,6 +16,7 @@ async function getGatewayProxy(env: Env): Promise<DurableObjectStub> {
 }
 
 export async function initGateway(env: Env): Promise<void> {
+  if (!isGatewayEnabled(env)) return;
   if (!env.DISCORD_TOKEN) return;
   const stub = await getGatewayProxy(env);
   await stub.fetch(
@@ -22,54 +29,61 @@ export async function initGateway(env: Env): Promise<void> {
 }
 
 export async function dispatchEvent(config: Config, event: WebhookEvent, env: Env): Promise<void> {
+  const langs = [...new Set(config.routes.map((r) => r.lang ?? "en"))];
+  const trMap = new Map<string, Translations>();
+  await Promise.all(
+    langs.map(async (lang) => {
+      trMap.set(lang, await loadTranslations(lang, env.KV));
+    }),
+  );
+
   for (const route of config.routes) {
     if (!matchRoute(route, event)) continue;
 
+    const target = route.target.threadId
+      ? `${route.target.channelId}/${route.target.threadId}`
+      : route.target.channelId;
+
     try {
-      const tr = await loadTranslations(route.lang ?? "en", env.KV);
+      const tr = trMap.get(route.lang ?? "en")!;
       const message = formatEvent(route, event, tr);
-      await sendWithRetry(route.target.channelId, message, env, route.target.threadId);
+      await sendToChannel(route.target.channelId, message, env, route.target.threadId);
+      await recordSend(env.KV, {
+        ts: Date.now(),
+        routeId: route.id,
+        event: event.event,
+        repo: (event.payload.repository as { full_name?: string } | undefined)?.full_name,
+        target,
+        ok: true,
+      });
     } catch (err) {
+      await recordSend(env.KV, {
+        ts: Date.now(),
+        routeId: route.id,
+        event: event.event,
+        repo: (event.payload.repository as { full_name?: string } | undefined)?.full_name,
+        target,
+        ok: false,
+        error: err instanceof Error ? err.message : String(err),
+      });
       log.error({ routeId: route.id, err }, "Route failed");
     }
   }
 }
 
-async function sleep(ms: number): Promise<void> {
-  return new Promise((resolve) => setTimeout(resolve, ms));
-}
-
-async function sendWithRetry(
-  channelId: string,
-  message: FormattedMessage,
-  env: Env,
-  threadId?: string,
-  maxRetries = 3,
-): Promise<void> {
-  for (let attempt = 0; attempt <= maxRetries; attempt++) {
-    try {
-      await sendToChannel(channelId, message, env, threadId);
-      return;
-    } catch (err: unknown) {
-      const error = err as Record<string, unknown>;
-      const isRateLimit = error.code === 50035 || error.status === 429;
-      if (isRateLimit && attempt < maxRetries) {
-        const retryAfter = ((error.retry_after as number) ?? (attempt + 1) * 2) as number;
-        log.warn({ retryAfter, attempt, maxRetries }, "Rate limited, retrying");
-        await sleep(retryAfter * 1000);
-        continue;
-      }
-      throw err;
-    }
-  }
-}
-
 async function sendToChannel(
   channelId: string,
   message: FormattedMessage,
   env: Env,
   threadId?: string,
 ): Promise<void> {
+  const token = env.DISCORD_TOKEN ?? "";
+  if (!isGatewayEnabled(env)) {
+    const result = await sendMessage(token, channelId, message, threadId);
+    if (!result.ok) throw new Error(result.error ?? "Send failed");
+    return;
+  }
+
   const stub = await getGatewayProxy(env);
   const res = await stub.fetch(
     new Request("https://do.internal", {

src/send-log.ts

@@ -0,0 +1,49 @@
+import { log } from "./log";
+
+export interface SendRecord {
+  ts: number;
+  routeId: string;
+  event: string;
+  repo?: string;
+  target: string;
+  ok: boolean;
+  error?: string;
+}
+
+const KEY_PREFIX = "logs:send:";
+const RETENTION_TTL = 3600;
+const MAX_READ = 200;
+
+function randomHex(): string {
+  const bytes = new Uint8Array(8);
+  crypto.getRandomValues(bytes);
+  return Array.from(bytes)
+    .map((b) => b.toString(16).padStart(2, "0"))
+    .join("");
+}
+
+export async function recordSend(kv: KVNamespace, record: SendRecord): Promise<void> {
+  try {
+    await kv.put(`${KEY_PREFIX}${record.ts}-${randomHex()}`, JSON.stringify(record), {
+      expirationTtl: RETENTION_TTL,
+    });
+  } catch (err) {
+    log.warn({ err }, "Failed to record send log");
+  }
+}
+
+export async function getSendLog(kv: KVNamespace, limit = 50): Promise<SendRecord[]> {
+  try {
+    const list = await kv.list({ prefix: KEY_PREFIX, limit: MAX_READ });
+    const records = await Promise.all(
+      list.keys.map((k) => kv.get<SendRecord>(k.name, "json")),
+    );
+    return records
+      .filter((r): r is SendRecord => r != null)
+      .sort((a, b) => b.ts - a.ts)
+      .slice(0, limit);
+  } catch (err) {
+    log.warn({ err }, "Failed to load send log");
+    return [];
+  }
+}

wrangler.jsonc

@@ -1,26 +1,42 @@
 {
-  "name": "webhooker",
-  "main": "src/index.ts",
-  "compatibility_date": "2025-01-01",
-  "compatibility_flags": ["nodejs_compat"],
-  "durable_objects": {
-    "bindings": [
-      {
-        "name": "DISCORD_GATEWAY",
-        "class_name": "DiscordGateway",
-      },
-    ],
-  },
-  "migrations": [
-    {
-      "tag": "v1",
-      "new_classes": ["DiscordGateway"],
-    },
-  ],
-  "kv_namespaces": [
-    {
-      "binding": "KV",
-      "id": "placeholder-will-be-replaced",
-    },
-  ],
+	"name": "webhooker",
+	"main": "src/index.ts",
+	"compatibility_date": "2025-01-01",
+	"compatibility_flags": [],
+	"vars": {
+		"DISCORD_GATEWAY_ENABLED": "true"
+	},
+	"assets": {
+		"directory": "./admin/dist",
+		"binding": "ASSETS",
+		"run_worker_first": true,
+		"not_found_handling": "single-page-application"
+	},
+	"triggers": {
+		"crons": [
+			"*/5 * * * *"
+		]
+	},
+	"durable_objects": {
+		"bindings": [
+			{
+				"name": "DISCORD_GATEWAY",
+				"class_name": "DiscordGateway",
+			},
+		],
+	},
+	"migrations": [
+		{
+			"tag": "v1",
+			"new_sqlite_classes": [
+				"DiscordGateway"
+			],
+		},
+	],
+	"kv_namespaces": [
+		{
+			"binding": "KV",
+			"id": "53abb6d985a44b80b2b08d510f73928a"
+		},
+	],
 }