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