101 lines
1.8 KiB
JavaScript
101 lines
1.8 KiB
JavaScript
/**
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* ldb.js - database backend for bcoin
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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const assert = require('assert');
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const LowlevelUp = require('./lowlevelup');
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const backends = require('./backends');
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/**
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* Create a database.
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* @alias module:db.LDB
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* @param {Object} options
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* @returns {LowlevelUp}
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*/
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function LDB(options) {
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const result = LDB.getBackend(options);
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const backend = result.backend;
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const location = result.location;
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return new LowlevelUp(backend, location, options);
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}
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/**
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* Get database name and extension based on options.
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* @param {String} db
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* @returns {Object}
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*/
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LDB.getName = function getName(db) {
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let name, ext;
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if (!db)
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db = 'memory';
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switch (db) {
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case 'ldb':
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case 'leveldb':
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case 'leveldown':
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name = 'leveldown';
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ext = 'ldb';
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break;
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case 'rdb':
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case 'rocksdb':
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case 'rocksdown':
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name = 'rocksdown';
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ext = 'rdb';
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break;
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case 'mdb':
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case 'lmdb':
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name = 'lmdb';
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ext = 'mdb';
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break;
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case 'mem':
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case 'memory':
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case 'rbt':
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name = 'memory';
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ext = 'mem';
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break;
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default:
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name = db;
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ext = 'db';
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break;
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}
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return [name, ext];
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};
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/**
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* Get target backend and location.
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* @param {Object} options
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* @returns {Object}
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*/
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LDB.getBackend = function getBackend(options) {
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const [name, ext] = LDB.getName(options.db);
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const backend = backends.get(name);
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let location = options.location;
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if (typeof location !== 'string') {
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assert(name === 'memory', 'Location required.');
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location = 'memory';
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}
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return {
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backend: backend,
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location: `${location}.${ext}`
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};
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};
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/*
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* Expose
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*/
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module.exports = LDB;
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