54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
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"use strict";
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var encoders = require('../lib/object-codec').encoders;
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var decoders = require('../lib/object-codec').decoders;
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var Binary = require('bodec').Binary;
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var cache = memCache.cache = {};
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module.exports = memCache;
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function memCache(repo) {
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var loadAs = repo.loadAs;
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repo.loadAs = loadAsCached;
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function loadAsCached(type, hash, callback) {
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if (!callback) return loadAsCached.bind(this, type, hash);
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if (hash in cache) return callback(null, dupe(type, cache[hash]), hash);
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loadAs.call(repo, type, hash, function (err, value) {
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if (value === undefined) return callback(err);
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if (type !== "blob" || value.length < 100) {
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cache[hash] = dupe(type, value);
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}
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return callback.apply(this, arguments);
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});
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}
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var saveAs = repo.saveAs;
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repo.saveAs = saveAsCached;
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function saveAsCached(type, value, callback) {
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if (!callback) return saveAsCached.bind(this, type, value);
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value = dupe(type, value);
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saveAs.call(repo, type, value, function (err, hash) {
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if (err) return callback(err);
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if (type !== "blob" || value.length < 100) {
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cache[hash] = value;
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}
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return callback(null, hash, value);
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});
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}
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}
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function dupe(type, value) {
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if (type === "blob") {
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if (type.length >= 100) return value;
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return new Binary(value);
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}
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return decoders[type](encoders[type](value));
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}
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function deepFreeze(obj) {
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Object.freeze(obj);
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Object.keys(obj).forEach(function (key) {
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var value = obj[key];
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if (typeof value === "object") deepFreeze(value);
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});
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}
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