55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
/**
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* ldb.js - global ldb tracker
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* https://github.com/indutny/bcoin
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*/
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var bcoin = require('../bcoin');
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var network = bcoin.protocol.network;
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var db = {};
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module.exports = function ldb(name, options) {
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var levelup = require('levelup');
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var file = bcoin.prefix + '/' + name + '-' + network.type + '.db';
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var backend = process.env.BCOIN_DB;
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bcoin.ensurePrefix();
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if (!db[file]) {
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if (bcoin.isBrowser) {
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backend = 'level-js';
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} else {
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if (!backend || backend === 'rocksdb')
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backend = 'rocksdown';
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else if (backend === 'leveldb')
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backend = 'leveldown';
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else if (backend === 'lmdb')
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backend = 'lmdb';
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else if (backend === 'tree')
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backend = 'tree';
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else
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assert(false, 'Bad DB.');
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}
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db[file] = new levelup(file, {
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keyEncoding: 'ascii',
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valueEncoding: 'binary',
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createIfMissing: true,
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errorIfExists: false,
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compression: options.compression !== false,
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cacheSize: options.cacheSize || (8 << 20),
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writeBufferSize: options.writeBufferSize || (4 << 20),
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maxOpenFiles: options.maxOpenFiles || 8192,
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// For LMDB if we decide to use it:
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sync: options.sync || false,
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mapSize: options.mapSize || 150 * (1024 << 20),
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writeMap: options.writeMap || false,
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db: require(backend)
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});
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}
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return db[file];
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};
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