Created
August 15, 2024 23:56
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Exponential backoff retry helper for DurableObjectStub
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| import { DurableObject } from 'cloudflare:workers'; | |
| const attempts = 3; | |
| const baseBackoff = 100; | |
| const maxBackoff = 20000; | |
| function getBackoff(attempt: number) { | |
| const backoff = baseBackoff * Math.pow(2, attempt) * Math.random(); | |
| return Math.round(Math.min(maxBackoff, backoff)); | |
| } | |
| type DurableObjectCallback<T extends DurableObject, R> = ( | |
| stub: DurableObjectStub<T>, | |
| ) => Promise<R>; | |
| export async function retry<T extends DurableObject, R>( | |
| namespace: DurableObjectNamespace<T>, | |
| name: string, | |
| callback: DurableObjectCallback<T, R>, | |
| ): Promise<R> { | |
| const id = namespace.idFromName(name); | |
| let attempt = 0; | |
| while (true) { | |
| try { | |
| const obj = namespace.get(id); | |
| return await callback(obj); | |
| } catch (error: any) { | |
| // Failure was not a transient internal error, so don't retry. | |
| if (!error.retryable) throw error; | |
| // Reached max attempts, don't retry. | |
| if (++attempt >= attempts) throw error; | |
| const backoff = getBackoff(attempt); | |
| console.log(`Caught "${error.message}" (attempt ${attempt}/${attempts})`); | |
| await scheduler.wait(backoff); | |
| } | |
| } | |
| } |
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