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August 30, 2024 20:16
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saga.ts
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| export type SideEffect<Result> = { | |
| commit: () => Promise<Result>; | |
| rollback: () => Promise<any>; | |
| }; | |
| export async function saga<T>( | |
| callback: ( | |
| run: <Result>(sideEffect: SideEffect<Result>) => Promise<Result> | |
| ) => Promise<T> | |
| ): Promise<T> { | |
| const rollbacks: SideEffect<any>["rollback"][] = []; | |
| async function run<Result>(sideEffect: SideEffect<Result>): Promise<Result> { | |
| try { | |
| const result = await sideEffect.commit(); | |
| rollbacks.unshift(sideEffect.rollback); | |
| return result; | |
| } catch (e) { | |
| for (const rollback of rollbacks) { | |
| await rollback(); | |
| } | |
| throw e; | |
| } | |
| } | |
| return await callback(run); | |
| } |
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