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