75 lines
2 KiB
JavaScript
75 lines
2 KiB
JavaScript
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define(function() {
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/*
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SyncFS is a crappy way to use chrome.storage.sync for entries larger than 4KB.
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This will work until chrome.syncFileSystem is more offline-friendly.
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Entries are set with a string if they're less than 3KB, otherwise the keyed entry
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stores the number of 3KB chunks used, and those are stored at key + chunkNumber.
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*/
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var cache = null;
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var requests = [];
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var pending = false;
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var decode = function(key) {
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//extracts multiple entries from a single key
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//presumes cache is set first
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var seed = cache[key];
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if (!seed) return null;
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if (typeof seed == "string") return seed;
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var pieces = [];
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for (var i = 0; i < seed; i++) {
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pieces.push(cache[key + i]);
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}
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var whole = pieces.join("");
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return whole;
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};
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return {
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get: function(key, callback) {
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if (cache) {
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var result = decode(key);
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return callback(result);
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}
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requests.push(callback);
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if (pending) return;
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chrome.storage.sync.get(function(all) {
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cache = all;
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var result = decode(key);
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return callback(result);
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});
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},
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set: function(key, data, callback) {
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cache = null;
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data = data;
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if (data.length < 3000) {
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var hash = {};
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hash[key] = data;
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chrome.storage.sync.set(hash, callback);
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} else {
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var chunks = [];
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for (var i = 0; i < data.length; i += 3000) {
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chunks.push(data.substr(i, i + 3000));
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}
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var hash = {};
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hash[key] = chunks.length;
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chunks.map(function(chunk, i) {
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hash[key + i] = chunk;
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});
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chrome.storage.sync.set(hash, callback)
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}
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},
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remove: function(key, callback) {
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var seed = cache[key];
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if (typeof seed == "number") {
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for (var i = 0; i < seed; i++) {
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chrome.storage.sync.remove(key + i);
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}
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}
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chrome.storage.sync.remove(key, callback);
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cache = null;
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}
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}
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});
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