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import { collections } from "$lib/server/database";
import { ObjectId } from "mongodb";
/**
* Returns the lock id if the lock was acquired, false otherwise
*/
export async function acquireLock(key: string): Promise<ObjectId | false> {
try {
const id = new ObjectId();
const insert = await collections.semaphores.insertOne({
_id: id,
key,
createdAt: new Date(),
updatedAt: new Date(),
});
return insert.acknowledged ? id : false; // true if the document was inserted
} catch (e) {
// unique index violation, so there must already be a lock
return false;
}
}
export async function releaseLock(key: string, lockId: ObjectId) {
await collections.semaphores.deleteOne({
_id: lockId,
key,
});
}
export async function isDBLocked(key: string): Promise<boolean> {
const res = await collections.semaphores.countDocuments({
key,
});
return res > 0;
}
export async function refreshLock(key: string, lockId: ObjectId): Promise<boolean> {
const result = await collections.semaphores.updateOne(
{
_id: lockId,
key,
},
{
$set: {
updatedAt: new Date(),
},
}
);
return result.matchedCount > 0;
}
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