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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2015-present Raymond Hill
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
'use strict';
/******************************************************************************/
import { broadcast, broadcastToAll } from './broadcast.js';
/******************************************************************************/
let buffer = null;
let lastReadTime = 0;
let writePtr = 0;
// After 30 seconds without being read, the logger buffer will be considered
// unused, and thus disabled.
const logBufferObsoleteAfter = 30 * 1000;
const janitorTimer = vAPI.defer.create(( ) => {
if ( buffer === null ) { return; }
if ( lastReadTime >= (Date.now() - logBufferObsoleteAfter) ) {
return janitorTimer.on(logBufferObsoleteAfter);
}
logger.enabled = false;
buffer = null;
writePtr = 0;
logger.ownerId = undefined;
broadcastToAll({ what: 'loggerDisabled' });
});
const boxEntry = details => {
details.tstamp = Date.now() / 1000 | 0;
return JSON.stringify(details);
};
const pushOne = box => {
if ( writePtr !== 0 && box === buffer[writePtr-1] ) { return; }
if ( writePtr === buffer.length ) {
buffer.push(box);
} else {
buffer[writePtr] = box;
}
writePtr += 1;
};
const logger = {
enabled: false,
ownerId: undefined,
writeOne(details) {
if ( buffer === null ) { return; }
pushOne(boxEntry(details));
},
readAll(ownerId) {
this.ownerId = ownerId;
if ( buffer === null ) {
this.enabled = true;
buffer = [];
janitorTimer.on(logBufferObsoleteAfter);
broadcast({ what: 'loggerEnabled' });
}
const out = buffer.slice(0, writePtr);
buffer.fill('', 0, writePtr);
writePtr = 0;
lastReadTime = Date.now();
return out;
},
};
/******************************************************************************/
export default logger;
/******************************************************************************/
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