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Merge pull request OHIF#2408 from OHIF/feat/idc-2374
IDC-2374: Exponential backoff and retry after 500 error
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| import retry from 'retry'; | ||
|
|
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| const defaultRetryOptions = { | ||
| retries: 5, | ||
| factor: 3, | ||
| minTimeout: 1 * 1000, | ||
| maxTimeout: 60 * 1000, | ||
| randomize: true, | ||
| retryableStatusCodes: [429, 500], | ||
| }; | ||
|
|
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| let retryOptions = { ...defaultRetryOptions }; | ||
|
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| /** | ||
| * Request hook used to add retry functionality to XHR requests. | ||
| * | ||
| * @param {XMLHttpRequest} request XHR request instance | ||
| * @param {object} metadata Metadata about the request | ||
| * @param {object} metadata.url URL | ||
| * @param {object} metadata.method HTTP method | ||
| * @returns {XMLHttpRequest} request instance optionally modified | ||
| */ | ||
| const xhrRetryRequestHook = (request, metadata) => { | ||
| const { url, method } = metadata; | ||
|
|
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| function faultTolerantRequestSend(...args) { | ||
| const operation = retry.operation(retryOptions); | ||
|
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| operation.attempt(function operationAttempt(currentAttempt) { | ||
| const originalOnReadyStateChange = request.onreadystatechange; | ||
|
|
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| /** Overriding/extending XHR function */ | ||
| request.onreadystatechange = function onReadyStateChange(...args) { | ||
| originalOnReadyStateChange.apply(request, args); | ||
|
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| if (retryOptions.retryableStatusCodes.includes(request.status)) { | ||
| const errorMessage = `Attempt to request ${url} failed.`; | ||
| const attemptFailedError = new Error(errorMessage); | ||
| operation.retry(attemptFailedError); | ||
| } | ||
| }; | ||
|
|
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| /** Call open only on retry (after headers and other things were set in the xhr instance) */ | ||
| if (currentAttempt > 1) { | ||
| console.warn(`Requesting ${url}... (attempt: ${currentAttempt})`); | ||
| request.open(method, url, true); | ||
| } | ||
| }); | ||
|
|
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| originalRequestSend.apply(request, args); | ||
| } | ||
|
|
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| /** Overriding/extending XHR function */ | ||
| const originalRequestSend = request.send; | ||
| request.send = faultTolerantRequestSend; | ||
|
|
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| return request; | ||
| }; | ||
|
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| /** | ||
| * Returns a configured retry request hook function | ||
| * that can be used to add retry functionality to XHR request. | ||
| * | ||
| * Default options: | ||
| * retries: 5 | ||
| * factor: 3 | ||
| * minTimeout: 1 * 1000 | ||
| * maxTimeout: 60 * 1000 | ||
| * randomize: true | ||
| * | ||
| * @param {object} options | ||
| * @param {number} options.retires number of retries | ||
| * @param {number} options.factor factor | ||
| * @param {number} options.minTimeout the min timeout | ||
| * @param {number} options.maxTimeout the max timeout | ||
| * @param {boolean} options.randomize randomize | ||
| * @param {array} options.retryableStatusCodes status codes that can trigger retry | ||
| * @returns {function} the configured retry request function | ||
| */ | ||
| export const getXHRRetryRequestHook = (options = {}) => { | ||
| retryOptions = { ...defaultRetryOptions }; | ||
| if ('retries' in options) { | ||
| retryOptions.retries = options.retries; | ||
| } | ||
| if ('factor' in options) { | ||
| retryOptions.factor = options.factor; | ||
| } | ||
| if ('minTimeout' in options) { | ||
| retryOptions.minTimeout = options.minTimeout; | ||
| } | ||
| if ('maxTimeout' in options) { | ||
| retryOptions.maxTimeout = options.maxTimeout; | ||
| } | ||
| if ('randomize' in options) { | ||
| retryOptions.randomize = options.randomize; | ||
| } | ||
| if ('retryableStatusCodes' in options) { | ||
| retryOptions.retryableStatusCodes = options.retryableStatusCodes; | ||
| } | ||
| return xhrRetryRequestHook; | ||
| }; | ||
|
|
||
| export default getXHRRetryRequestHook; |
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