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construct/modules/static/js/io.js

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/*
* IRCd Charybdis 5/Matrix
*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk (jason@zemos.net)
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
'use strict';
/**
******************************************************************************
*
* I/O
*
* Lower-level protocol suite.
*/
/**
******************************************************************************
* Lower-level network related subsystems
*
*****************************************************************************
*/
mc.io = {};
/** Global IO stats
*/
mc.io.stats =
{
aborts: 0,
errors: 0,
};
/** Global stats for data transmitted.
*/
mc.io.stats.sent =
{
bytes: 0,
msgs: 0,
};
/** Global stats for data received.
*/
mc.io.stats.recv =
{
bytes: 0,
msgs: 0,
};
/** Active requests table.
*
* This is a collection to provide a way to iterate through all pending requests.
* You should not manipulate this collection; requests add and remove themselves.
* To cancel a request or all requests, use the io.cancel() suite.
*/
mc.io.requests =
{
// URL => request
};
/** Cancel a request by URL.
*
* @returns a promise which can be awaited on.
*/
mc.io.cancel = function(url, reason = "Aborted")
{
let request = mc.io.requests[url];
let promise = request.abort(reason);
mc.io.stats.aborts++;
return promise;
}
/** Cancel all requests.
*
* @returns a promise of all() the cancelations which can be awaited on.
*/
mc.io.cancel.all = function(reason = "Aborted")
{
let cancel = (url) => mc.io.cancel(url, reason);
let urls = Object.keys(mc.io.requests);
let count = urls.length;
console.warn("Interrupting " + count + " pending IO requests (reason: " + reason + ")");
let futures = urls.map(cancel);
return Promise.all(futures);
};
/** Add a request to the requests collection. Called automatically by request
* object constructor. You do not need this.
*/
Object.defineProperty(mc.io.requests, 'insert', {
writable: false,
enumerable: false,
configurable: false,
value: function(request)
{
let key = request.url;
if((key in mc.io.requests))
return false;
mc.io.requests[key] = request;
return true;
}});
/** Remove a request from the requests collection. Called automatically by request
* object destructor. You do not need this.
*/
Object.defineProperty(mc.io.requests, 'remove', {
writable: false,
enumerable: false,
configurable: false,
value: function(request)
{
let key = request.url;
delete mc.io.requests[key];
}});