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/**
* part of Hachette
* Serving of storage data corresponding to requested urls (server side).
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*/
/*
* IMPORTS_START
* IMPORT listen_for_connection
* IMPORT get_storage
* IMPORT get_query_all
* IMPORT TYPE_PREFIX
* IMPORT CONNECTION_TYPE
* IMPORT url_matches
* IMPORTS_END
*/
var storage;
var query_all;
function handle_change(connection_data, change)
{
if (change.prefix !== TYPE_PREFIX.PAGE)
return;
connection_data.port.postMessage(["change", change]);
}
async function handle_subscription(connection_data, message)
{
const [action, url] = message;
if (action === "unsubscribe") {
connection_data.subscribed.delete(url);
return;
}
connection_data.subscribed.add(url);
connection_data.port.postMessage(["new_url", query_all(url)]);
}
function remove_storage_listener(cb)
{
storage.remove_change_listener(cb);
}
function new_connection(port)
{
console.log("new page info connection!");
const connection_data = {
subscribed : new Set(),
port
};
let _handle_change = change => handle_change(connection_data, change);
storage.add_change_listener(_handle_change);
port.onMessage.addListener(m => handle_subscription(connection_data, m));
port.onDisconnect.addListener(() => remove_storage_listener(handle_change));
}
async function start_page_info_server()
{
storage = await get_storage();
query_all = await get_query_all();
listen_for_connection(CONNECTION_TYPE.PAGE_INFO, new_connection);
}
/*
* EXPORTS_START
* EXPORT start_page_info_server
* EXPORTS_END
*/
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