mirror of
https://github.com/titanscouting/tra-analysis.git
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221 lines
8.5 KiB
JavaScript
221 lines
8.5 KiB
JavaScript
/**
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* Copyright 2016, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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'use strict';
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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}
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var extend = require("extend");
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var through2 = require("through2");
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var ended = require("is-stream-ended");
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var api_callable_1 = require("./api_callable");
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var PagedIteration = /** @class */ (function (_super) {
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__extends(PagedIteration, _super);
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/**
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* Creates an API caller that returns a stream to performs page-streaming.
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*
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* @private
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* @constructor
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* @param {PageDescriptor} pageDescriptor - indicates the structure
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* of page streaming to be performed.
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*/
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function PagedIteration(pageDescriptor) {
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var _this = _super.call(this) || this;
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_this.pageDescriptor = pageDescriptor;
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return _this;
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}
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PagedIteration.prototype.createActualCallback = function (request, callback) {
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var self = this;
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return function fetchNextPageToken(err, response) {
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if (err) {
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callback(err);
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return;
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}
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var resources = response[self.pageDescriptor.resourceField];
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var pageToken = response[self.pageDescriptor.responsePageTokenField];
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if (pageToken) {
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request[self.pageDescriptor.requestPageTokenField] = pageToken;
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callback(err, resources, request, response);
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}
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else {
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callback(err, resources, null, response);
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}
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};
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};
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PagedIteration.prototype.wrap = function (func) {
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var self = this;
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return function wrappedCall(argument, metadata, options, callback) {
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return func(argument, metadata, options, self.createActualCallback(argument, callback));
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};
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};
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PagedIteration.prototype.init = function (settings, callback) {
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return api_callable_1.NormalApiCaller.prototype.init.call(this, settings, callback);
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};
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PagedIteration.prototype.call = function (apiCall, argument, settings, canceller) {
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argument = extend({}, argument);
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if (settings.pageToken) {
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argument[this.pageDescriptor.requestPageTokenField] = settings.pageToken;
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}
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if (settings.pageSize) {
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argument[this.pageDescriptor.requestPageSizeField] = settings.pageSize;
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}
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if (!settings.autoPaginate) {
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api_callable_1.NormalApiCaller.prototype.call.call(this, apiCall, argument, settings, canceller);
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return;
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}
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var maxResults = settings.maxResults || -1;
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var allResources = [];
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function pushResources(err, resources, next) {
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if (err) {
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canceller.callback(err);
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return;
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}
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for (var i = 0; i < resources.length; ++i) {
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allResources.push(resources[i]);
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if (allResources.length === maxResults) {
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next = null;
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break;
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}
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}
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if (!next) {
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canceller.callback(null, allResources);
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return;
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}
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setImmediate(apiCall, next, pushResources);
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}
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setImmediate(apiCall, argument, pushResources);
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};
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return PagedIteration;
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}(api_callable_1.NormalApiCaller));
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exports.PagedIteration = PagedIteration;
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var PageDescriptor = /** @class */ (function () {
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/**
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* Describes the structure of a page-streaming call.
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*
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* @property {String} requestPageTokenField
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* @property {String} responsePageTokenField
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* @property {String} resourceField
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*
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* @param {String} requestPageTokenField - The field name of the page token in
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* the request.
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* @param {String} responsePageTokenField - The field name of the page token in
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* the response.
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* @param {String} resourceField - The resource field name.
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*
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* @constructor
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*/
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function PageDescriptor(requestPageTokenField, responsePageTokenField, resourceField) {
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this.requestPageTokenField = requestPageTokenField;
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this.responsePageTokenField = responsePageTokenField;
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this.resourceField = resourceField;
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}
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/**
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* Creates a new object Stream which emits the resource on 'data' event.
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* @private
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* @param {ApiCall} apiCall - the callable object.
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* @param {Object} request - the request object.
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* @param {CallOptions=} options - the call options to customize the api call.
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* @return {Stream} - a new object Stream.
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*/
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PageDescriptor.prototype.createStream = function (apiCall, request, options) {
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var stream = through2.obj();
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options = extend({}, options, { autoPaginate: false });
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var maxResults = 'maxResults' in options ? options.maxResults : -1;
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var pushCount = 0;
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var started = false;
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function callback(err, resources, next) {
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if (err) {
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stream.emit('error', err);
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return;
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}
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for (var i = 0; i < resources.length; ++i) {
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if (ended(stream)) {
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return;
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}
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if (resources[i] === null) {
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continue;
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}
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stream.push(resources[i]);
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pushCount++;
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if (pushCount === maxResults) {
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stream.end();
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}
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}
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if (ended(stream)) {
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return;
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}
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if (!next) {
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stream.end();
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return;
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}
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// When pageToken is specified in the original options, it will overwrite
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// the page token field in the next request. Therefore it must be cleared.
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if ('pageToken' in options) {
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delete options.pageToken;
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}
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if (stream.isPaused()) {
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request = next;
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started = false;
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}
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else {
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setImmediate(apiCall, next, options, callback);
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}
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}
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stream.on('resume', function () {
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if (!started) {
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started = true;
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apiCall(request, options, callback);
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}
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});
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return stream;
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};
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/**
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* Returns a new API caller.
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* @private
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* @return {PageStreamable} - the page streaming caller.
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*/
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PageDescriptor.prototype.apiCaller = function () {
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return new PagedIteration(this);
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};
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return PageDescriptor;
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}());
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exports.PageDescriptor = PageDescriptor;
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//# sourceMappingURL=paged_iteration.js.map
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