fix: throws "failed to queue" error when task already exists

package.json

@@ -27,6 +27,7 @@
     "graphql-request": "^7.1.0",
     "hono": "^4.5.11",
     "jose": "^5.8.0",
+    "lodash.isequal": "^4.5.0",
     "lodash.mapkeys": "^4.6.0",
     "luxon": "^3.5.0",
     "zod": "^3.23.8"
@@ -36,6 +37,7 @@
     "@cloudflare/workers-types": "^4.20240903.0",
     "@trivago/prettier-plugin-sort-imports": "^4.3.0",
     "@types/bun": "^1.1.8",
+    "@types/lodash.isequal": "^4.5.8",
     "@types/lodash.mapkeys": "^4.6.9",
     "@types/luxon": "^3.4.2",
     "drizzle-kit": "^0.22.8",

src/libs/tasks/queueTask.ts

@@ -1,4 +1,5 @@
 import type { HonoRequest } from "hono";
+import isEqual from "lodash.isequal";
 import { DateTime, type DurationLike } from "luxon";
 
 import type { Env } from "~/types/env";
@@ -48,6 +49,14 @@ export async function queueTask(
   const adminSdkCredentials = getAdminSdkCredentials(env);
   const { projectId } = adminSdkCredentials;
 
+  const task = buildTask(
+    projectId,
+    queueName,
+    scheduleConfig,
+    domain,
+    body,
+    req?.header(),
+  );
   const res = await fetch(
     `https://content-cloudtasks.googleapis.com/v2/projects/${projectId}/locations/northamerica-northeast1/queues/${queueName}/tasks?alt=json`,
     {
@@ -55,25 +64,54 @@ export async function queueTask(
         Authorization: `Bearer ${await getGoogleAuthToken(adminSdkCredentials)}`,
         "Content-Type": "application/json",
       },
-      body: JSON.stringify({
-        task: buildTask(
-          projectId,
-          queueName,
-          scheduleConfig,
-          domain,
-          body,
-          req?.header(),
-        ),
-      }),
+      body: JSON.stringify({ task }),
       method: "POST",
     },
   );
 
   if (!res.ok) {
+    if (res.status === 409) {
+      if (
+        await checkIfTaskExists(
+          env,
+          queueName,
+          task.name.split("/").at(-1)!,
+          body,
+        )
+      ) {
+        return;
+      }
+    }
+
     throw new FailedToQueueTaskError(res.status, await res.text());
   }
 }
 
+async function checkIfTaskExists(
+  env: Env,
+  queueName: QueueName,
+  taskId: string,
+  expectedBody: QueueBody[QueueName],
+) {
+  const adminSdkCredentials = getAdminSdkCredentials(env);
+
+  const body = await fetch(
+    `https://content-cloudtasks.googleapis.com/v2/projects/${adminSdkCredentials.projectId}/locations/northamerica-northeast1/queues/${queueName}/tasks/${taskId}?responseView=FULL`,
+    {
+      headers: {
+        Authorization: `Bearer ${await getGoogleAuthToken(adminSdkCredentials)}`,
+      },
+    },
+  )
+    .then((res) => res.json())
+    .then(({ httpRequest: { body } }) => body);
+
+  return isEqual(
+    JSON.parse(Buffer.from(body as string, "base64").toString()),
+    expectedBody,
+  );
+}
+
 function buildTask(
   projectId: string,
   queueName: QueueName,