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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,7 @@ | ||
| <h3>Search Overview</h3> | ||
| <p> | ||
| The object returned from <code>gcloud.search</code> gives you complete access to store and search your indexes and documents. | ||
| </p> | ||
| <p> | ||
| To learn more about Search, see <a href="https://cloud.google.com/search">What is Google Cloud Search?</a> | ||
| </p> |
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| /*! | ||
| * Copyright 2015 Google Inc. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| /*! | ||
| * @module common/streamrouter | ||
| */ | ||
|
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| 'use strict'; | ||
|
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| var streamEvents = require('stream-events'); | ||
| var through = require('through2'); | ||
|
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| /** | ||
| * @type {module:common/util} | ||
| * @private | ||
| */ | ||
| var util = require('../common/util.js'); | ||
|
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| /*! Developer Documentation | ||
| * | ||
| * streamRouter is used to extend `nextQuery`+callback methods with stream | ||
| * functionality. | ||
| * | ||
| * Before: | ||
| * | ||
| * search.query('done=true', function(err, results, nextQuery) {}); | ||
| * | ||
| * After: | ||
| * | ||
| * search.query('done=true').on('data', function(result) {}); | ||
| * | ||
| * Methods to extend should be written to accept callbacks and return a | ||
| * `nextQuery`. All stream logic is handled in `streamRouter.router_`. | ||
| */ | ||
| var streamRouter = {}; | ||
|
|
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| /** | ||
| * Cache the original method, then overwrite it on the Class's prototype. | ||
| * | ||
| * @param {function} Class - The parent class of the methods to extend. | ||
| * @param {array|string} methodNames - Name(s) of the methods to extend. | ||
| */ | ||
| streamRouter.extend = function(Class, methodNames) { | ||
| methodNames = util.arrayize(methodNames); | ||
|
|
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| methodNames.forEach(function(methodName) { | ||
| var originalMethod = Class.prototype[methodName]; | ||
|
|
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| Class.prototype[methodName] = function() { | ||
| return streamRouter.router_(arguments, originalMethod.bind(this)); | ||
| }; | ||
| }); | ||
| }; | ||
|
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| /** | ||
| * The router accepts all incoming arguments to the overwritten method. If the | ||
| * last argument is a function, simply pass them through to the original method. | ||
| * If the last argument is not a function, activate stream mode. | ||
| * | ||
| * Stream mode simply calls the nextQuery recursively. The stream ends when | ||
| * `nextQuery` is null. | ||
| * | ||
| * @param {array} args - The original `arguments` pseudo-array as it was | ||
| * received by the original method. | ||
| * @param {function} originalMethod - The cached method that accepts a callback | ||
| * and returns `nextQuery` to receive more results. | ||
| * @return {undefined|stream} | ||
| */ | ||
| streamRouter.router_ = function(args, originalMethod) { | ||
| args = util.toArray(args); | ||
| var callback = args[args.length - 1]; | ||
| var isStreamMode = !util.is(callback, 'function'); | ||
|
|
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| if (isStreamMode) { | ||
| var stream = streamEvents(through.obj()); | ||
|
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| var onResultSet = function(err, results, nextQuery) { | ||
| if (err) { | ||
| stream.emit('error', err); | ||
| stream.end(); | ||
| return; | ||
| } | ||
|
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| results.forEach(function(result) { | ||
| stream.push(result); | ||
| }); | ||
|
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| if (nextQuery) { | ||
| originalMethod(nextQuery, onResultSet); | ||
| } else { | ||
| stream.end(); | ||
| } | ||
| }; | ||
|
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| stream.once('reading', function() { | ||
| originalMethod.apply(null, args.concat(onResultSet)); | ||
| }); | ||
|
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| return stream; | ||
| } else { | ||
| originalMethod.apply(null, args); | ||
| } | ||
| }; | ||
|
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| module.exports = streamRouter; |
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