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"use strict";
var Storage = (() => {
let chunksKey = k => `${k}/CHUNKS`;
async function safeOp(op, type, keys) {
let sync = type === "sync";
try {
if (sync) {
let remove = op === "remove";
if (remove || op === "get") {
keys = [].concat(keys); // don't touch the passed argument
let mergeResults = {};
let localFallback = await getLocalFallback();
if (localFallback.size) {
let localKeys = keys.filter(k => localFallback.has(k));
if (localKeys.length) {
if (remove) {
await browser.storage.local.remove(localKeys);
for (let k of localKeys) {
localFallback.delete(k);
}
await setLocalFallback(localFallback);
} else {
mergeResults = await browser.storage.local.get(localKeys);
}
keys = keys.filter(k => !localFallback.has(k));
}
}
if (keys.length) { // we may not have non-fallback keys anymore
let chunkCounts = Object.entries(await browser.storage.sync.get(
keys.map(chunksKey)))
.map(([k, count]) => [k.split("/")[0], count]);
if (chunkCounts.length) {
let chunkedKeys = [];
for (let [k, count] of chunkCounts) {
// prepare to fetch all the chunks at once
while (count-- > 0) chunkedKeys.push(`${k}/${count}`);
}
if (remove) {
let doomedKeys = keys
.concat(chunkCounts.map(([k, count]) => chunksKey(k)))
.concat(chunkedKeys);
return await browser.storage.sync.remove(doomedKeys);
} else {
let chunks = await browser.storage.sync.get(chunkedKeys);
for (let [k, count] of chunkCounts) {
let orderedChunks = [];
for (let j = 0; j < count; j++) {
orderedChunks.push(chunks[`${k}/${j}`]);
}
let whole = orderedChunks.join('');
try {
mergeResults[k] = JSON.parse(whole);
keys.splice(keys.indexOf(k), 1); // remove from "main" keys
} catch (e) {
error(e, "Could not parse chunked storage key %s (%s).", k, whole);
}
}
}
}
}
return keys.length ?
Object.assign(mergeResults, await browser.storage.sync[op](keys))
: mergeResults;
} else if (op === "set") {
keys = Object.assign({}, keys); // don't touch the passed argument
const MAX_ITEM_SIZE = 4096;
// Firefox Sync's max object BYTEs size is 16384, Chrome's 8192.
// Rather than mesuring actual bytes, we play it safe by halving then
// lowest to cope with escapes / multibyte characters.
let removeKeys = [];
for (let k of Object.keys(keys)) {
let s = JSON.stringify(keys[k]);
let chunksCountKey = chunksKey(k);
let oldCount = await browser.storage.sync.get(chunksCountKey)[chunksCountKey] || 0;
let count;
if (s.length > MAX_ITEM_SIZE) {
count = Math.ceil(s.length / MAX_ITEM_SIZE);
let chunks = {
[chunksCountKey]: count
};
for(let j = 0, o = 0; j < count; ++j, o += MAX_ITEM_SIZE) {
chunks[`${k}/${j}`] = s.substr(o, MAX_ITEM_SIZE);
}
await browser.storage.sync.set(chunks);
keys[k] = "[CHUNKED]";
} else {
count = 0;
removeKeys.push(chunksCountKey);
}
if (oldCount-- > count) {
do {
removeKeys.push(`${k}${oldCount}`);
} while(oldCount-- > count);
}
}
await browser.storage.sync.remove(removeKeys);
}
}
let ret = await browser.storage[type][op](keys);
if (sync && op === "set") {
let localFallback = await getLocalFallback();
let size = localFallback.size;
if (size > 0) {
for (let k of Object.keys(keys)) {
localFallback.delete(k);
}
if (size > localFallback.size) {
await setLocalFallback(localFallback);
}
}
}
return ret;
} catch (e) {
error(e, "%s.%s(%o)", type, op, keys);
if (sync) {
debug("Sync disabled? Falling back to local storage (%s %o)", op, keys);
let localFallback = await getLocalFallback();
let failedKeys = Array.isArray(keys) ? keys
: typeof keys === "string" ? [keys] : Object.keys(keys);
for (let k of failedKeys) {
localFallback.add(k);
}
await setLocalFallback(localFallback);
} else {
throw e;
}
}
return await browser.storage.local[op](keys);
}
const LFK_NAME = "__fallbackKeys";
async function setLocalFallback(keys) {
return await browser.storage.local.set({[LFK_NAME]: [...keys]});
}
async function getLocalFallback() {
let keys = (await browser.storage.local.get(LFK_NAME))[LFK_NAME];
return new Set(Array.isArray(keys) ? keys : []);
}
return {
async get(type, keys) {
return await safeOp("get", type, keys);
},
async set(type, keys) {
return await safeOp("set", type, keys);
},
async remove(type, keys) {
return await safeOp("remove", type, keys);
},
async hasLocalFallback(key) {
return (await getLocalFallback()).has(key);
},
async isChunked(key) {
let ccKey = chunksKey(key);
let data = await browser.storage.sync.get([key, ccKey]);
return data[key] === "[CHUNKED]" && parseInt(data[ccKey]);
}
};
})()
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