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/**
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* Myext storage through connection (client side)
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT CONNECTION_TYPE
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* IMPORT TYPE_PREFIX
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* IMPORT list_prefixes
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* IMPORT make_once
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* IMPORT browser
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* IMPORTS_END
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*/
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var call_id = 0;
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var port;
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var calls_waiting = new Map();
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function set_call_callback(resolve, reject, func, args)
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{
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port.postMessage([call_id, func, args]);
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calls_waiting.set(call_id++, [resolve, reject]);
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}
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async function remote_call(func, args)
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{
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return new Promise((resolve, reject) =>
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set_call_callback(resolve, reject, func, args));
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}
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function handle_message(message)
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{
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let callbacks = calls_waiting.get(message.call_id);
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if (callbacks === undefined) {
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handle_change(message);
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return;
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}
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let [resolve, reject] = callbacks;
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calls_waiting.delete(message.call_id);
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if (message.error !== undefined)
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setTimeout(reject, 0, message.error);
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else
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setTimeout(resolve, 0, message.result);
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}
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function list(name, prefix)
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{
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return {prefix, name, listeners : new Set()};
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}
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var scripts = list("scripts", TYPE_PREFIX.SCRIPT);
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var bags = list("bags", TYPE_PREFIX.BAG);
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var pages = list("pages", TYPE_PREFIX.PAGE);
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const list_by_prefix = {
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[TYPE_PREFIX.SCRIPT] : scripts,
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[TYPE_PREFIX.BAG] : bags,
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[TYPE_PREFIX.PAGE] : pages
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};
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var resolve_init;
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function handle_first_message(message)
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{
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for (let prefix of Object.keys(message))
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list_by_prefix[prefix].map = new Map(message[prefix]);
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port.onMessage.removeListener(handle_first_message);
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port.onMessage.addListener(handle_message);
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resolve_init();
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}
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function handle_change(change)
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{
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let list = list_by_prefix[change.prefix];
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if (change.new_val === undefined)
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list.map.delete(change.item);
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else
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list.map.set(change.item, change.new_val);
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for (let listener_callback of list.listeners)
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listener_callback(change);
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}
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var exports = {};
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function start_connection(resolve)
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{
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resolve_init = resolve;
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port = browser.runtime.connect({name : CONNECTION_TYPE.REMOTE_STORAGE});
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port.onMessage.addListener(handle_first_message);
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}
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async function init() {
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await new Promise((resolve, reject) => start_connection(resolve));
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return exports;
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}
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for (let call_name of ["set", "remove", "replace", "clear"])
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exports [call_name] = (...args) => remote_call(call_name, args);
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// TODO: Much of the code below is copy-pasted from /background/storage.mjs.
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// This should later be refactored into a separate module
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// to avoid duplication.
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/*
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* Facilitate listening to changes
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*/
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exports.add_change_listener = function (cb, prefixes=list_prefixes)
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{
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if (typeof(prefixes) === "string")
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prefixes = [prefixes];
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for (let prefix of prefixes)
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list_by_prefix[prefix].listeners.add(cb);
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}
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exports.remove_change_listener = function (cb, prefixes=list_prefixes)
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{
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if (typeof(prefixes) === "string")
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prefixes = [prefixes];
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for (let prefix of prefixes)
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list_by_prefix[prefix].listeners.delete(cb);
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}
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/* Prepare some hepler functions to get elements of a list */
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function list_items_it(list, with_values=false)
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{
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return with_values ? list.map.entries() : list.map.keys();
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}
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function list_entries_it(list)
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{
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return list_items_it(list, true);
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}
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function list_items(list, with_values=false)
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{
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let array = [];
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for (let item of list_items_it(list, with_values))
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array.push(item);
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return array;
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}
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function list_entries(list)
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{
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return list_items(list, true);
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}
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exports.get = function (prefix, item)
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{
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return list_by_prefix[prefix].map.get(item);
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}
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exports.get_all_names = function (prefix)
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{
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return list_items(list_by_prefix[prefix]);
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}
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exports.get_all_names_it = function (prefix)
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{
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return list_items_it(list_by_prefix[prefix]);
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}
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exports.get_all = function (prefix)
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{
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return list_entries(list_by_prefix[prefix]);
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}
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exports.get_all_it = function (prefix)
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{
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return list_entries_it(list_by_prefix[prefix]);
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}
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const get_remote_storage = make_once(init);
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/*
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* EXPORTS_START
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* EXPORT get_remote_storage
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* EXPORTS_END
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*/
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