62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
// Copyright IBM Corp. 2016,2018. All Rights Reserved.
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// Node module: loopback-datasource-juggler
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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'use strict';
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const assert = require('assert');
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const utils = require('../utils');
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/**
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* Return all keys in the database.
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*
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* **WARNING**: This method is not suitable for large data sets as all
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* key-values pairs are loaded into memory at once. For large data sets,
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* use `iterateKeys()` instead.
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*
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* @param {Object} filter An optional filter object with the following
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* @param {String} filter.match Glob string used to filter returned
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* keys (i.e. `userid.*`). All connectors are required to support `*` and
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* `?`, but may also support additional special characters specific to the
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* database.
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* @param {Object} options
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* @callback {Function} callback
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* @promise
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*
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*
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* @header KVAO.keys(filter, callback)
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*/
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module.exports = function keyValueKeys(filter, options, callback) {
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if (callback === undefined) {
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if (typeof options === 'function') {
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callback = options;
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options = undefined;
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} else if (options === undefined && typeof filter === 'function') {
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callback = filter;
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filter = undefined;
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}
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}
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filter = filter || {};
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options = options || {};
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assert(typeof filter === 'object', 'filter must be an object');
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assert(typeof options === 'object', 'options must be an object');
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callback = callback || utils.createPromiseCallback();
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const iter = this.iterateKeys(filter, options);
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const keys = [];
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iter.next(onNextKey);
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function onNextKey(err, key) {
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if (err) return callback(err);
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if (key === undefined) return callback(null, keys);
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keys.push(key);
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iter.next(onNextKey);
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}
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return callback.promise;
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};
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