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export enum InsistPolicy { |
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RETRY = 'RETRY', |
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THROW = 'THROW', |
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} |
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type FallibleFunction<R> = (() => Promise<R>) | (() => R) |
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type ErrorTypeConstructor = new (...args: any[]) => Error |
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type SimpleErrorClassifier = (_: any) => InsistPolicy | null |
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type ComplexErrorClassifier = (_: any, setRetryAfter: (t: number) => void) => InsistPolicy | null |
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type ErrorClassifier = SimpleErrorClassifier | ComplexErrorClassifier |
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type PromiseInnerType<P> = { |
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0: P extends Promise<infer T> ? PromiseInnerType<T> : never |
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1: P |
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}[P extends Promise<infer T> ? 0 : 1] |
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export type InsistOptions = { |
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maxRetries?: number |
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retryInterval?: number |
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intervalIncrements?: number |
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maxRetryInterval?: number |
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insistPolicy?: InsistPolicy |
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alwaysRetryOn?: ErrorTypeConstructor[] |
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alwaysThrowOn?: ErrorTypeConstructor[] |
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errorClassifier?: ErrorClassifier |
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} |
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export type BasicInsistOptions = Omit<InsistOptions, 'alwaysRetryOn' | 'alwaysThrowOn' | 'insistPolicy'> |
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const isSimpleErrorClassifier = (v: ErrorClassifier): v is SimpleErrorClassifier => v.length === 1 |
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const getSimpleErrorClassifier = ( |
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errorClassifier: ErrorClassifier | undefined, |
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setRetryAfter: (t: number) => void |
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): SimpleErrorClassifier => { |
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if (errorClassifier === undefined) { |
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// eslint-disable-next-line @typescript-eslint/no-unused-vars |
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return (_: any) => null |
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} |
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return isSimpleErrorClassifier(errorClassifier) ? errorClassifier : (_: any) => errorClassifier(_, setRetryAfter) |
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} |
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const _sleep = async (ms: number): Promise<void> => { |
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return new Promise<void>(resolve => setTimeout(resolve, ms)) |
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} |
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export const insist = async <R>( |
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fn: FallibleFunction<R>, |
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_retryOptions?: InsistOptions |
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): Promise<PromiseInnerType<R>> => { |
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const maxRetries = _retryOptions?.maxRetries ?? 5 |
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const intervalIncrements = _retryOptions?.intervalIncrements ?? 1000 |
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const maxRetryInterval = _retryOptions?.maxRetryInterval ?? 15000 |
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const insistPolicy = _retryOptions?.insistPolicy ?? InsistPolicy.RETRY |
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const alwaysRetryOn = _retryOptions?.alwaysRetryOn ?? [] |
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const alwaysThrowOn = _retryOptions?.alwaysThrowOn ?? [] |
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56
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let retryAfter: null | number = null |
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let retryInterval = _retryOptions?.retryInterval ?? 2000 |
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let e: Error | null |
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60
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const errorClassifier: SimpleErrorClassifier = getSimpleErrorClassifier( |
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_retryOptions?.errorClassifier, |
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(t: number) => { |
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retryAfter = t !== null && !isNaN(t) && t >= 0 ? t : null |
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} |
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) |
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try { |
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return (await fn()) as PromiseInnerType<R> |
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} catch (_e) { |
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e = _e |
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} |
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73
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for (let numIntents = 0; numIntents < maxRetries; numIntents++) { |
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let retry = insistPolicy === InsistPolicy.RETRY |
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// Check for special cases |
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if (retry) { |
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if (errorClassifier(e) === InsistPolicy.THROW) { |
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retry = false |
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} else { |
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for (const errorType of alwaysThrowOn) { |
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if (e !== null && e instanceof errorType) { |
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retry = false |
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break |
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} |
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} |
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} |
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} else { |
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if (errorClassifier(e) === InsistPolicy.RETRY) { |
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retry = true |
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} else { |
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for (const errorType of alwaysRetryOn) { |
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if (e !== null && e instanceof errorType) { |
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retry = true |
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break |
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} |
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} |
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} |
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} |
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101
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// Throw or retry |
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if (!retry) { |
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throw e |
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104
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} |
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105
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106
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await _sleep(retryAfter ?? retryInterval) |
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retryInterval = Math.min(retryInterval + intervalIncrements, maxRetryInterval) |
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retryAfter = null |
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109
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110
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try { |
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111
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return (await fn()) as PromiseInnerType<R> |
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112
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} catch (_e) { |
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e = _e |
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} |
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115
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} |
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116
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117
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throw e // It should be unreachable |
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} |
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119
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Coder-Spirit /
ts-insistent
