Hi Team,
am currently integrating a feature that sends email lists to Google Ads
via API in a serverless environment. This function operates without control
over concurrency, processing batches of SHA256 hashed email addresses. It
checks for the existence of a User List with a given name; if absent, it
creates a new list and uploads users.
However, I am encountering a concurrency issue. When two instances run
concurrently with a new User List name, both attempt to create the User
List simultaneously, leading to duplicate lists. This duplication is a
critical issue for the project's success.
Below is the relevant TypeScript code snippet:
*User List ID Check and Retrieval:*
```typescript
async getUserListId(name: string) {
const resp = await this.search({
gaql: `SELECT user_list.id, user_list.resource_name FROM user_list WHERE
user_list.name = '${name}'`,
});
if (!resp.results || !resp.results.length) {
return undefined;
}
return resp.results[0].userList.id as string;
}
```
The ID is later converted to a resource name via `customers/${this.
customerId}/userLists/${id}`
*User List Creation (if ID not found):*
```typescript
async createUserList(
name: string,
description: string = 'A user list from Segment CDP',
) {
const resp = await this.userListMutation([
{
create: {
name: name,
description: description,
membershipStatus: "OPEN",
accessReason: "OWNED",
crmBasedUserList: {
uploadKeyType: 'CONTACT_INFO',
dataSourceType: 'FIRST_PARTY',
},
membershipLifeSpan: '10000',
eligibleForSearch: true,
},
},
]);
const body = await resp.json();
return body;
}
```
I am seeking advice on how to handle this concurrency issue effectively.
Specifically, how can I ensure that only one User List is created even when
multiple instances attempt to create a list with the same name
simultaneously?
Please note that the environment I am working on is extremely restrictive
an only allows me to access Typescript fetch api and NodeJS crypto library.
The only way I can make it work is some REST API feature I am not across.
Thank you for your assistance.
Best regards,
Saad
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