This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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111 lines
4.0 KiB
111 lines
4.0 KiB
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @typechecks |
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* |
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*/ |
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'use strict'; |
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var Promise = require('./Promise'); |
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function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; } |
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var ExecutionEnvironment = require('./ExecutionEnvironment'); |
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var sprintf = require('./sprintf'); |
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var fetch = require('./fetch'); |
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var warning = require('./warning'); |
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var DEFAULT_TIMEOUT = 15000; |
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var DEFAULT_RETRIES = [1000, 3000]; |
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/** |
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* Makes a POST request to the server with the given data as the payload. |
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* Automatic retries are done based on the values in `retryDelays`. |
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*/ |
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function fetchWithRetries(uri, initWithRetries) { |
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var _ref = initWithRetries || {}, |
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fetchTimeout = _ref.fetchTimeout, |
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retryDelays = _ref.retryDelays, |
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init = _objectWithoutProperties(_ref, ['fetchTimeout', 'retryDelays']); |
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var _fetchTimeout = fetchTimeout != null ? fetchTimeout : DEFAULT_TIMEOUT; |
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var _retryDelays = retryDelays != null ? retryDelays : DEFAULT_RETRIES; |
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var requestsAttempted = 0; |
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var requestStartTime = 0; |
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return new Promise(function (resolve, reject) { |
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/** |
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* Sends a request to the server that will timeout after `fetchTimeout`. |
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* If the request fails or times out a new request might be scheduled. |
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*/ |
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function sendTimedRequest() { |
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requestsAttempted++; |
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requestStartTime = Date.now(); |
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var isRequestAlive = true; |
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var request = fetch(uri, init); |
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var requestTimeout = setTimeout(function () { |
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isRequestAlive = false; |
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if (shouldRetry(requestsAttempted)) { |
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process.env.NODE_ENV !== 'production' ? warning(false, 'fetchWithRetries: HTTP timeout, retrying.') : void 0; |
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retryRequest(); |
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} else { |
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reject(new Error(sprintf('fetchWithRetries(): Failed to get response from server, ' + 'tried %s times.', requestsAttempted))); |
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} |
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}, _fetchTimeout); |
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request.then(function (response) { |
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clearTimeout(requestTimeout); |
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if (isRequestAlive) { |
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// We got a response, we can clear the timeout. |
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if (response.status >= 200 && response.status < 300) { |
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// Got a response code that indicates success, resolve the promise. |
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resolve(response); |
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} else if (shouldRetry(requestsAttempted)) { |
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// Fetch was not successful, retrying. |
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// TODO(#7595849): Only retry on transient HTTP errors. |
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process.env.NODE_ENV !== 'production' ? warning(false, 'fetchWithRetries: HTTP error, retrying.') : void 0, retryRequest(); |
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} else { |
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// Request was not successful, giving up. |
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var error = new Error(sprintf('fetchWithRetries(): Still no successful response after ' + '%s retries, giving up.', requestsAttempted)); |
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error.response = response; |
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reject(error); |
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} |
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} |
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})['catch'](function (error) { |
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clearTimeout(requestTimeout); |
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if (shouldRetry(requestsAttempted)) { |
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retryRequest(); |
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} else { |
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reject(error); |
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} |
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}); |
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} |
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/** |
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* Schedules another run of sendTimedRequest based on how much time has |
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* passed between the time the last request was sent and now. |
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*/ |
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function retryRequest() { |
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var retryDelay = _retryDelays[requestsAttempted - 1]; |
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var retryStartTime = requestStartTime + retryDelay; |
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// Schedule retry for a configured duration after last request started. |
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setTimeout(sendTimedRequest, retryStartTime - Date.now()); |
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} |
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/** |
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* Checks if another attempt should be done to send a request to the server. |
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*/ |
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function shouldRetry(attempt) { |
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return ExecutionEnvironment.canUseDOM && attempt <= _retryDelays.length; |
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} |
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sendTimedRequest(); |
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}); |
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} |
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module.exports = fetchWithRetries; |