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64 lines
1.4 KiB
JavaScript
64 lines
1.4 KiB
JavaScript
"use strict";
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const Promise = require("bluebird");
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const pDefer = require("p-defer");
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module.exports = function createRequestQueue(options = {}) {
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let requestBuffer = [];
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let responseBuffer = [];
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let seenError;
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function failAllRequests(error) {
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let failedRequests = requestBuffer;
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requestBuffer = [];
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seenError = error;
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for (let request of failedRequests) {
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request.reject(error);
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}
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}
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function maybeOnMatch() {
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if (options.onMatch != null) {
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return Promise.try(() => {
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return options.onMatch();
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}).catch((error) => {
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failAllRequests(error);
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});
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}
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}
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return {
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pushRequest: function () {
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if (responseBuffer.length > 0) {
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let returnValue = Promise.resolve(responseBuffer.shift());
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maybeOnMatch();
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return returnValue;
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} else if (seenError !== undefined) {
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return Promise.reject(seenError);
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} else {
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let { resolve, reject, promise } = pDefer();
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requestBuffer.push({ resolve, reject });
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return promise;
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}
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},
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pushResponse: function (response) {
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if (requestBuffer.length > 0) {
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let request = requestBuffer.shift();
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request.resolve(response);
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maybeOnMatch();
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} else {
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responseBuffer.push(response);
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}
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},
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failAllRequests: failAllRequests,
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requestCount: function () {
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return requestBuffer.length;
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},
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responseCount: function () {
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return responseBuffer.length;
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}
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};
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};
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