115 lines
3.8 KiB
Plaintext
115 lines
3.8 KiB
Plaintext
/**
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @providesModule fetchWithRetries
|
|
* @typechecks
|
|
* @flow
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
const ExecutionEnvironment = require('./ExecutionEnvironment');
|
|
|
|
const sprintf = require('./sprintf');
|
|
const fetch = require('./fetch');
|
|
const warning = require('./warning');
|
|
|
|
export type InitWithRetries = {
|
|
body?: mixed;
|
|
cache?: ?string;
|
|
credentials?: ?string;
|
|
fetchTimeout?: ?number;
|
|
headers?: mixed;
|
|
method?: ?string;
|
|
mode?: ?string;
|
|
retryDelays?: ?Array<number>;
|
|
};
|
|
|
|
const DEFAULT_TIMEOUT = 15000;
|
|
const DEFAULT_RETRIES = [1000, 3000];
|
|
|
|
/**
|
|
* Makes a POST request to the server with the given data as the payload.
|
|
* Automatic retries are done based on the values in `retryDelays`.
|
|
*/
|
|
function fetchWithRetries(uri: string, initWithRetries?: ?InitWithRetries): Promise<any> {
|
|
const { fetchTimeout, retryDelays, ...init } = initWithRetries || {};
|
|
const _fetchTimeout = fetchTimeout != null ? fetchTimeout : DEFAULT_TIMEOUT;
|
|
const _retryDelays = retryDelays != null ? retryDelays : DEFAULT_RETRIES;
|
|
|
|
let requestsAttempted = 0;
|
|
let requestStartTime = 0;
|
|
return new Promise((resolve, reject) => {
|
|
/**
|
|
* Sends a request to the server that will timeout after `fetchTimeout`.
|
|
* If the request fails or times out a new request might be scheduled.
|
|
*/
|
|
function sendTimedRequest(): void {
|
|
requestsAttempted++;
|
|
requestStartTime = Date.now();
|
|
let isRequestAlive = true;
|
|
const request = fetch(uri, init);
|
|
const requestTimeout = setTimeout(() => {
|
|
isRequestAlive = false;
|
|
if (shouldRetry(requestsAttempted)) {
|
|
warning(false, 'fetchWithRetries: HTTP timeout, retrying.');
|
|
retryRequest();
|
|
} else {
|
|
reject(new Error(sprintf('fetchWithRetries(): Failed to get response from server, ' + 'tried %s times.', requestsAttempted)));
|
|
}
|
|
}, _fetchTimeout);
|
|
|
|
request.then(response => {
|
|
clearTimeout(requestTimeout);
|
|
if (isRequestAlive) {
|
|
// We got a response, we can clear the timeout.
|
|
if (response.status >= 200 && response.status < 300) {
|
|
// Got a response code that indicates success, resolve the promise.
|
|
resolve(response);
|
|
} else if (shouldRetry(requestsAttempted)) {
|
|
// Fetch was not successful, retrying.
|
|
// TODO(#7595849): Only retry on transient HTTP errors.
|
|
warning(false, 'fetchWithRetries: HTTP error, retrying.'), retryRequest();
|
|
} else {
|
|
// Request was not successful, giving up.
|
|
const error: any = new Error(sprintf('fetchWithRetries(): Still no successful response after ' + '%s retries, giving up.', requestsAttempted));
|
|
error.response = response;
|
|
reject(error);
|
|
}
|
|
}
|
|
}).catch(error => {
|
|
clearTimeout(requestTimeout);
|
|
if (shouldRetry(requestsAttempted)) {
|
|
retryRequest();
|
|
} else {
|
|
reject(error);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Schedules another run of sendTimedRequest based on how much time has
|
|
* passed between the time the last request was sent and now.
|
|
*/
|
|
function retryRequest(): void {
|
|
const retryDelay = _retryDelays[requestsAttempted - 1];
|
|
const retryStartTime = requestStartTime + retryDelay;
|
|
// Schedule retry for a configured duration after last request started.
|
|
setTimeout(sendTimedRequest, retryStartTime - Date.now());
|
|
}
|
|
|
|
/**
|
|
* Checks if another attempt should be done to send a request to the server.
|
|
*/
|
|
function shouldRetry(attempt: number): boolean {
|
|
return ExecutionEnvironment.canUseDOM && attempt <= _retryDelays.length;
|
|
}
|
|
|
|
sendTimedRequest();
|
|
});
|
|
}
|
|
|
|
module.exports = fetchWithRetries; |