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fixed possible race condition when paying with gems

This commit is contained in:
MasterGordon 2026-03-10 18:54:33 +01:00
parent 4798b2a0c6
commit 676bd7a978
1 changed files with 25 additions and 17 deletions
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42
backend/repositories/gemsRepository.ts
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@ -18,17 +18,21 @@ export const addGems = async (
user: string, user: string,
gems: number, gems: number,
) => { ) => {
const { count, totalCount } = await getGems(db, user); await db.transaction(async (tx) => {
if ((await db.select().from(Gems).where(eq(Gems.user, user))).length === 0) { const res = (await tx.select().from(Gems).where(eq(Gems.user, user)))[0];
await db const count = res?.count ?? 0;
.insert(Gems) const totalCount = res?.totalCount ?? 0;
.values({ user, count: count + gems, totalCount: totalCount + gems }); if (!res) {
return; await tx
} .insert(Gems)
await db .values({ user, count: count + gems, totalCount: totalCount + gems });
.update(Gems) return;
.set({ count: count + gems, totalCount: totalCount + gems }) }
.where(eq(Gems.user, user)); await tx
.update(Gems)
.set({ count: count + gems, totalCount: totalCount + gems })
.where(eq(Gems.user, user));
});
}; };
export const removeGems = async ( export const removeGems = async (
@ -36,10 +40,14 @@ export const removeGems = async (
user: string, user: string,
gems: number, gems: number,
) => { ) => {
const { count, totalCount } = await getGems(db, user); await db.transaction(async (tx) => {
if (count - gems < 0) throw new Error("Not enough gems"); const res = (await tx.select().from(Gems).where(eq(Gems.user, user)))[0];
await db const count = res?.count ?? 0;
.update(Gems) const totalCount = res?.totalCount ?? 0;
.set({ count: count - gems, totalCount: totalCount }) if (count - gems < 0) throw new Error("Not enough gems");
.where(eq(Gems.user, user)); await tx
.update(Gems)
.set({ count: count - gems, totalCount: totalCount })
.where(eq(Gems.user, user));
});
}; };