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/**
* This file is part of Haketilo.
*
* Function: Broadcast messages to different execution contexts of the extension
*
* Copyright (C) 2021 Wojtek Kosior
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#FROM common/message_server.js IMPORT connect_to_background
function sender_connection()
{
return {
type: "sender",
port: connect_to_background("broadcast_send")
};
}
#EXPORT sender_connection
function out(sender_conn, channel_name, value)
{
sender_conn.port.postMessage(["broadcast", channel_name, value]);
}
#EXPORT out
/*
* prepare()'d message will be broadcasted if the connection is closed or when
* flush() is called. All messages prepared by given sender will be discarded
* when discard() is called.
*
* Timeout will cause the prepared message to be broadcasted after given number
* of miliseconds unless discard() is called in the meantime. It is mostly
* useful as a fallback in case this connection end gets nuked (e.g. because
* browser window is closed) and onDisconnect event is not dispatched to
* background script's Port object. This is only an issue for browsers as old as
* IceCat 60: https://bugzilla.mozilla.org/show_bug.cgi?id=1392067
*
* Timeout won't be scheduled at all if its value is given as 0.
*/
function prepare(sender_conn, channel_name, value, timeout=5000)
{
sender_conn.port.postMessage(["prepare", channel_name, value, timeout]);
}
#EXPORT prepare
function discard(sender_conn)
{
sender_conn.port.postMessage(["discard"]);
}
#EXPORT discard
function flush(sender_conn)
{
sender_conn.port.postMessage(["flush"]);
}
#EXPORT flush
function listener_connection(cb)
{
const conn = {
type: "listener",
port: connect_to_background("broadcast_listen")
};
conn.port.onMessage.addListener(cb);
return conn;
}
#EXPORT listener_connection
function subscribe(listener_conn, channel_name)
{
listener_conn.port.postMessage(["subscribe", channel_name]);
}
#EXPORT subscribe
function unsubscribe(listener_conn, channel_name)
{
listener_conn.port.postMessage(["unsubscribe", channel_name]);
}
#EXPORT unsubscribe
function close(conn)
{
if (conn.type === "sender")
flush(conn);
setTimeout(() => conn.port.disconnect());
}
#EXPORT close
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