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Code Issues Releases Wiki Activity

Consolidate filter list reverse lookup code into a single file

Browse Source 
Since it's possible to execute specific code paths according
to whether the context is that of a worker or not, it's possible
to keep the main/thread code in a single file. Keeping the
main/worker code paths into a single file is more convenient
for both code maintenance and code review.
This commit is contained in:
Raymond Hill 2020-08-01 10:32:40 -04:00
parent 7dd48a6c8c
commit 90c7e79f4f
No known key found for this signature in database
GPG Key ID: 25E1490B761470C2
2 changed files with 441 additions and 470 deletions
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293
src/js/reverselookup-worker.js
View File

@ -1,293 +0,0 @@
/*******************************************************************************
uBlock Origin - a browser extension to block requests.
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
*/
/* global onmessage, postMessage */
'use strict';
/******************************************************************************/
const reBlockStart = /^#block-start-(\d+)\n/gm;
let listEntries = Object.create(null);
/******************************************************************************/
const extractBlocks = function(content, begId, endId) {
reBlockStart.lastIndex = 0;
const out = [];
let match = reBlockStart.exec(content);
while ( match !== null ) {
const beg = match.index + match[0].length;
const blockId = parseInt(match[1], 10);
if ( blockId >= begId && blockId < endId ) {
const end = content.indexOf('#block-end-' + match[1], beg);
out.push(content.slice(beg, end));
reBlockStart.lastIndex = end;
}
match = reBlockStart.exec(content);
}
return out.join('\n');
};
/******************************************************************************/
// https://github.com/MajkiIT/polish-ads-filter/issues/14768#issuecomment-536006312
// Avoid reporting badfilter-ed filters.
const fromNetFilter = function(details) {
const lists = [];
const compiledFilter = details.compiledFilter;
for ( const assetKey in listEntries ) {
const entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
const content = extractBlocks(entry.content, 0, 1);
let pos = 0;
for (;;) {
pos = content.indexOf(compiledFilter, pos);
if ( pos === -1 ) { break; }
// We need an exact match.
// https://github.com/gorhill/uBlock/issues/1392
// https://github.com/gorhill/uBlock/issues/835
const notFound = pos !== 0 && content.charCodeAt(pos - 1) !== 0x0A;
pos += compiledFilter.length;
if (
notFound ||
pos !== content.length && content.charCodeAt(pos) !== 0x0A
) {
continue;
}
lists.push({
assetKey: assetKey,
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
const response = {};
response[details.rawFilter] = lists;
postMessage({
id: details.id,
response: response
});
};
/******************************************************************************/
// Looking up filter lists from a cosmetic filter is a bit more complicated
// than with network filters:
//
// The filter is its raw representation, not its compiled version. This is
// because the cosmetic filtering engine can't translate a live cosmetic
// filter into its compiled version. Reason is I do not want to burden
// cosmetic filtering with the resource overhead of being able to re-compile
// live cosmetic filters. I want the cosmetic filtering code to be left
// completely unaffected by reverse lookup requirements.
//
// Mainly, given a CSS selector and a hostname as context, we will derive
// various versions of compiled filters and see if there are matches. This way
// the whole CPU cost is incurred by the reverse lookup code -- in a worker
// thread, and the cosmetic filtering engine incurs no cost at all.
//
// For this though, the reverse lookup code here needs some knowledge of
// the inners of the cosmetic filtering engine.
// FilterContainer.fromCompiledContent() is our reference code to create
// the various compiled versions.
const fromCosmeticFilter = function(details) {
const match = /^#@?#\^?/.exec(details.rawFilter);
const prefix = match[0];
const exception = prefix.charAt(1) === '@';
const selector = details.rawFilter.slice(prefix.length);
const isHtmlFilter = prefix.endsWith('^');
const hostname = details.hostname;
// The longer the needle, the lower the number of false positives.
// https://github.com/uBlockOrigin/uBlock-issues/issues/1139
// Mind that there is no guarantee a selector has `\w` characters.
const needle = selector.match(/\w+|\*/g).reduce(function(a, b) {
return a.length > b.length ? a : b;
});
const regexFromLabels = (prefix, hn, suffix) =>
new RegExp(
prefix +
hn.split('.').reduce((acc, item) => `(${acc}\\.)?${item}`) +
suffix
);
// https://github.com/uBlockOrigin/uBlock-issues/issues/803
// Support looking up selectors of the form `*##...`
const reHostname = regexFromLabels('^', hostname, '$');
let reEntity;
{
const domain = details.domain;
const pos = domain.indexOf('.');
if ( pos !== -1 ) {
reEntity = regexFromLabels(
'^(',
hostname.slice(0, pos + hostname.length - domain.length),
'\\.)?\\*$'
);
}
}
const hostnameMatches = hn => {
return hn === '' ||
reHostname.test(hn) ||
reEntity !== undefined && reEntity.test(hn);
};
const response = Object.create(null);
for ( const assetKey in listEntries ) {
const entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
let content = extractBlocks(entry.content, 1000, 2000),
isProcedural,
found;
let pos = 0;
while ( (pos = content.indexOf(needle, pos)) !== -1 ) {
let beg = content.lastIndexOf('\n', pos);
if ( beg === -1 ) { beg = 0; }
let end = content.indexOf('\n', pos);
if ( end === -1 ) { end = content.length; }
pos = end;
const fargs = JSON.parse(content.slice(beg, end));
const filterType = fargs[0];
// https://github.com/gorhill/uBlock/issues/2763
if ( filterType >= 0 && filterType <= 5 && details.ignoreGeneric ) {
continue;
}
// Do not confuse cosmetic filters with HTML ones.
if ( (filterType === 64) !== isHtmlFilter ) { continue; }
switch ( filterType ) {
// Lowly generic cosmetic filters
case 0: // simple id-based
if ( exception ) { break; }
if ( fargs[1] !== selector.slice(1) ) { break; }
if ( selector.charAt(0) !== '#' ) { break; }
found = prefix + selector;
break;
case 2: // simple class-based
if ( exception ) { break; }
if ( fargs[1] !== selector.slice(1) ) { break; }
if ( selector.charAt(0) !== '.' ) { break; }
found = prefix + selector;
break;
case 1: // complex id-based
case 3: // complex class-based
if ( exception ) { break; }
if ( fargs[2] !== selector ) { break; }
found = prefix + selector;
break;
// Highly generic cosmetic filters
case 4: // simple highly generic
case 5: // complex highly generic
if ( exception ) { break; }
if ( fargs[1] !== selector ) { break; }
found = prefix + selector;
break;
// Specific cosmetic filtering
// Generic exception
case 8:
// HTML filtering
case 64:
if ( exception !== ((fargs[2] & 0b001) !== 0) ) { break; }
isProcedural = (fargs[2] & 0b010) !== 0;
if (
isProcedural === false && fargs[3] !== selector ||
isProcedural && JSON.parse(fargs[3]).raw !== selector
) {
break;
}
if ( hostnameMatches(fargs[1]) === false ) { break; }
// https://www.reddit.com/r/uBlockOrigin/comments/d6vxzj/
// Ignore match if specific cosmetic filters are disabled
if (
filterType === 8 &&
exception === false &&
details.ignoreSpecific
) {
break;
}
found = fargs[1] + prefix + selector;
break;
// Scriptlet injection
case 32:
if ( exception !== ((fargs[2] & 0b001) !== 0) ) { break; }
if ( fargs[3] !== selector ) { break; }
if ( hostnameMatches(fargs[1]) ) {
found = fargs[1] + prefix + selector;
}
break;
}
if ( found !== undefined ) {
if ( response[found] === undefined ) {
response[found] = [];
}
response[found].push({
assetKey: assetKey,
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
}
postMessage({
id: details.id,
response: response
});
};
/******************************************************************************/
onmessage = function(e) { // jshint ignore:line
const msg = e.data;
switch ( msg.what ) {
case 'resetLists':
listEntries = Object.create(null);
break;
case 'setList':
listEntries[msg.details.assetKey] = msg.details;
break;
case 'fromNetFilter':
fromNetFilter(msg);
break;
case 'fromCosmeticFilter':
fromCosmeticFilter(msg);
break;
}
};
/******************************************************************************/

618
src/js/reverselookup.js
View File

@ -23,198 +23,462 @@
/******************************************************************************/
µBlock.staticFilteringReverseLookup = (( ) => {
(( ) => {
// >>>>> start of local scope
/******************************************************************************/
const workerTTL = 5 * 60 * 1000;
const pendingResponses = new Map();
// Worker context
let worker = null;
let workerTTLTimer;
let needLists = true;
let messageId = 1;
if (
self.WorkerGlobalScope instanceof Object &&
self instanceof self.WorkerGlobalScope
) {
const reBlockStart = /^#block-start-(\d+)\n/gm;
let listEntries = Object.create(null);
/******************************************************************************/
const onWorkerMessage = function(e) {
const msg = e.data;
const resolver = pendingResponses.get(msg.id);
pendingResponses.delete(msg.id);
resolver(msg.response);
};
/******************************************************************************/
const stopWorker = function() {
if ( workerTTLTimer !== undefined ) {
clearTimeout(workerTTLTimer);
workerTTLTimer = undefined;
}
if ( worker === null ) { return; }
worker.terminate();
worker = null;
needLists = true;
for ( const resolver of pendingResponses.values() ) {
resolver();
}
pendingResponses.clear();
};
/******************************************************************************/
const initWorker = function() {
if ( worker === null ) {
worker = new Worker('js/reverselookup-worker.js');
worker.onmessage = onWorkerMessage;
}
// The worker will be shutdown after n minutes without being used.
if ( workerTTLTimer !== undefined ) {
clearTimeout(workerTTLTimer);
}
workerTTLTimer = vAPI.setTimeout(stopWorker, workerTTL);
if ( needLists === false ) {
return Promise.resolve();
}
needLists = false;
const entries = new Map();
const onListLoaded = function(details) {
const entry = entries.get(details.assetKey);
// https://github.com/gorhill/uBlock/issues/536
// Use assetKey when there is no filter list title.
worker.postMessage({
what: 'setList',
details: {
assetKey: details.assetKey,
title: entry.title || details.assetKey,
supportURL: entry.supportURL,
content: details.content
const extractBlocks = function(content, begId, endId) {
reBlockStart.lastIndex = 0;
const out = [];
let match = reBlockStart.exec(content);
while ( match !== null ) {
const beg = match.index + match[0].length;
const blockId = parseInt(match[1], 10);
if ( blockId >= begId && blockId < endId ) {
const end = content.indexOf('#block-end-' + match[1], beg);
out.push(content.slice(beg, end));
reBlockStart.lastIndex = end;
}
match = reBlockStart.exec(content);
}
return out.join('\n');
};
// https://github.com/MajkiIT/polish-ads-filter/issues/14768#issuecomment-536006312
// Avoid reporting badfilter-ed filters.
const fromNetFilter = function(details) {
const lists = [];
const compiledFilter = details.compiledFilter;
for ( const assetKey in listEntries ) {
const entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
const content = extractBlocks(entry.content, 0, 1);
let pos = 0;
for (;;) {
pos = content.indexOf(compiledFilter, pos);
if ( pos === -1 ) { break; }
// We need an exact match.
// https://github.com/gorhill/uBlock/issues/1392
// https://github.com/gorhill/uBlock/issues/835
const notFound = pos !== 0 &&
content.charCodeAt(pos - 1) !== 0x0A;
pos += compiledFilter.length;
if (
notFound ||
pos !== content.length && content.charCodeAt(pos) !== 0x0A
) {
continue;
}
lists.push({
assetKey: assetKey,
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
const response = {};
response[details.rawFilter] = lists;
self.postMessage({ id: details.id, response });
};
// Looking up filter lists from a cosmetic filter is a bit more complicated
// than with network filters:
//
// The filter is its raw representation, not its compiled version. This is
// because the cosmetic filtering engine can't translate a live cosmetic
// filter into its compiled version. Reason is I do not want to burden
// cosmetic filtering with the resource overhead of being able to recompile
// live cosmetic filters. I want the cosmetic filtering code to be left
// completely unaffected by reverse lookup requirements.
//
// Mainly, given a CSS selector and a hostname as context, we will derive
// various versions of compiled filters and see if there are matches. This
// way the whole CPU cost is incurred by the reverse lookup code -- in a
// worker thread, and the cosmetic filtering engine incurs no cost at all.
//
// For this though, the reverse lookup code here needs some knowledge of
// the inners of the cosmetic filtering engine.
// FilterContainer.fromCompiledContent() is our reference code to create
// the various compiled versions.
const fromCosmeticFilter = function(details) {
const match = /^#@?#\^?/.exec(details.rawFilter);
const prefix = match[0];
const exception = prefix.charAt(1) === '@';
const selector = details.rawFilter.slice(prefix.length);
const isHtmlFilter = prefix.endsWith('^');
const hostname = details.hostname;
// The longer the needle, the lower the number of false positives.
// https://github.com/uBlockOrigin/uBlock-issues/issues/1139
// Mind that there is no guarantee a selector has `\w` characters.
const needle = selector.match(/\w+|\*/g).reduce(function(a, b) {
return a.length > b.length ? a : b;
});
const regexFromLabels = (prefix, hn, suffix) =>
new RegExp(
prefix +
hn.split('.').reduce((acc, item) => `(${acc}\\.)?${item}`) +
suffix
);
// https://github.com/uBlockOrigin/uBlock-issues/issues/803
// Support looking up selectors of the form `*##...`
const reHostname = regexFromLabels('^', hostname, '$');
let reEntity;
{
const domain = details.domain;
const pos = domain.indexOf('.');
if ( pos !== -1 ) {
reEntity = regexFromLabels(
'^(',
hostname.slice(0, pos + hostname.length - domain.length),
'\\.)?\\*$'
);
}
}
const hostnameMatches = hn => {
return hn === '' ||
reHostname.test(hn) ||
reEntity !== undefined && reEntity.test(hn);
};
const response = Object.create(null);
for ( const assetKey in listEntries ) {
const entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
let content = extractBlocks(entry.content, 1000, 2000),
isProcedural,
found;
let pos = 0;
while ( (pos = content.indexOf(needle, pos)) !== -1 ) {
let beg = content.lastIndexOf('\n', pos);
if ( beg === -1 ) { beg = 0; }
let end = content.indexOf('\n', pos);
if ( end === -1 ) { end = content.length; }
pos = end;
const fargs = JSON.parse(content.slice(beg, end));
const filterType = fargs[0];
// https://github.com/gorhill/uBlock/issues/2763
if (
filterType >= 0 &&
filterType <= 5 &&
details.ignoreGeneric
) {
continue;
}
// Do not confuse cosmetic filters with HTML ones.
if ( (filterType === 64) !== isHtmlFilter ) { continue; }
switch ( filterType ) {
// Lowly generic cosmetic filters
case 0: // simple id-based
if ( exception ) { break; }
if ( fargs[1] !== selector.slice(1) ) { break; }
if ( selector.charAt(0) !== '#' ) { break; }
found = prefix + selector;
break;
case 2: // simple class-based
if ( exception ) { break; }
if ( fargs[1] !== selector.slice(1) ) { break; }
if ( selector.charAt(0) !== '.' ) { break; }
found = prefix + selector;
break;
case 1: // complex id-based
case 3: // complex class-based
if ( exception ) { break; }
if ( fargs[2] !== selector ) { break; }
found = prefix + selector;
break;
// Highly generic cosmetic filters
case 4: // simple highly generic
case 5: // complex highly generic
if ( exception ) { break; }
if ( fargs[1] !== selector ) { break; }
found = prefix + selector;
break;
// Specific cosmetic filtering
// Generic exception
case 8:
// HTML filtering
case 64:
if ( exception !== ((fargs[2] & 0b001) !== 0) ) { break; }
isProcedural = (fargs[2] & 0b010) !== 0;
if (
isProcedural === false && fargs[3] !== selector ||
isProcedural && JSON.parse(fargs[3]).raw !== selector
) {
break;
}
if ( hostnameMatches(fargs[1]) === false ) { break; }
// https://www.reddit.com/r/uBlockOrigin/comments/d6vxzj/
// Ignore match if specific cosmetic filters are disabled
if (
filterType === 8 &&
exception === false &&
details.ignoreSpecific
) {
break;
}
found = fargs[1] + prefix + selector;
break;
// Scriptlet injection
case 32:
if ( exception !== ((fargs[2] & 0b001) !== 0) ) { break; }
if ( fargs[3] !== selector ) { break; }
if ( hostnameMatches(fargs[1]) ) {
found = fargs[1] + prefix + selector;
}
break;
}
if ( found !== undefined ) {
if ( response[found] === undefined ) {
response[found] = [];
}
response[found].push({
assetKey: assetKey,
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
}
self.postMessage({ id: details.id, response });
};
self.onmessage = function(e) { // jshint ignore:line
const msg = e.data;
switch ( msg.what ) {
case 'resetLists':
listEntries = Object.create(null);
break;
case 'setList':
listEntries[msg.details.assetKey] = msg.details;
break;
case 'fromNetFilter':
fromNetFilter(msg);
break;
case 'fromCosmeticFilter':
fromCosmeticFilter(msg);
break;
}
};
return;
}
/******************************************************************************/
// Main context
{
if ( typeof µBlock !== 'object' ) { return; }
const workerTTL = 5 * 60 * 1000;
const pendingResponses = new Map();
let worker = null;
let workerTTLTimer;
let needLists = true;
let messageId = 1;
const onWorkerMessage = function(e) {
const msg = e.data;
const resolver = pendingResponses.get(msg.id);
pendingResponses.delete(msg.id);
resolver(msg.response);
};
const stopWorker = function() {
if ( workerTTLTimer !== undefined ) {
clearTimeout(workerTTLTimer);
workerTTLTimer = undefined;
}
if ( worker === null ) { return; }
worker.terminate();
worker = null;
needLists = true;
for ( const resolver of pendingResponses.values() ) {
resolver();
}
pendingResponses.clear();
};
const initWorker = function() {
if ( worker === null ) {
worker = new Worker('js/reverselookup.js');
worker.onmessage = onWorkerMessage;
}
// The worker will be shutdown after n minutes without being used.
if ( workerTTLTimer !== undefined ) {
clearTimeout(workerTTLTimer);
}
workerTTLTimer = vAPI.setTimeout(stopWorker, workerTTL);
if ( needLists === false ) {
return Promise.resolve();
}
needLists = false;
const entries = new Map();
const onListLoaded = function(details) {
const entry = entries.get(details.assetKey);
// https://github.com/gorhill/uBlock/issues/536
// Use assetKey when there is no filter list title.
worker.postMessage({
what: 'setList',
details: {
assetKey: details.assetKey,
title: entry.title || details.assetKey,
supportURL: entry.supportURL,
content: details.content
}
});
};
const µb = µBlock;
for ( const listKey in µb.availableFilterLists ) {
if ( µb.availableFilterLists.hasOwnProperty(listKey) === false ) {
continue;
}
const entry = µb.availableFilterLists[listKey];
if ( entry.off === true ) { continue; }
entries.set(listKey, {
title: listKey !== µb.userFiltersPath ?
entry.title :
vAPI.i18n('1pPageName'),
supportURL: entry.supportURL || ''
});
}
if ( entries.size === 0 ) {
return Promise.resolve();
}
const promises = [];
for ( const listKey of entries.keys() ) {
promises.push(
µb.getCompiledFilterList(listKey).then(details => {
onListLoaded(details);
})
);
}
return Promise.all(promises);
};
const fromNetFilter = async function(rawFilter) {
if ( typeof rawFilter !== 'string' || rawFilter === '' ) { return; }
const µb = µBlock;
const writer = new µb.CompiledLineIO.Writer();
const parser = new vAPI.StaticFilteringParser();
parser.setMaxTokenLength(µb.urlTokenizer.MAX_TOKEN_LENGTH);
parser.analyze(rawFilter);
if ( µb.staticNetFilteringEngine.compile(parser, writer) === false ) {
return;
}
await initWorker();
const id = messageId++;
worker.postMessage({
what: 'fromNetFilter',
id: id,
compiledFilter: writer.last(),
rawFilter: rawFilter
});
return new Promise(resolve => {
pendingResponses.set(id, resolve);
});
};
const µb = µBlock;
for ( const listKey in µb.availableFilterLists ) {
if ( µb.availableFilterLists.hasOwnProperty(listKey) === false ) {
continue;
const fromCosmeticFilter = async function(details) {
if (
typeof details.rawFilter !== 'string' ||
details.rawFilter === ''
) {
return;
}
const entry = µb.availableFilterLists[listKey];
if ( entry.off === true ) { continue; }
entries.set(listKey, {
title: listKey !== µb.userFiltersPath ?
entry.title :
vAPI.i18n('1pPageName'),
supportURL: entry.supportURL || ''
await initWorker();
const id = messageId++;
const hostname = µBlock.URI.hostnameFromURI(details.url);
worker.postMessage({
what: 'fromCosmeticFilter',
id: id,
domain: µBlock.URI.domainFromHostname(hostname),
hostname: hostname,
ignoreGeneric:
µBlock.staticNetFilteringEngine.matchStringReverse(
'generichide',
details.url
) === 2,
ignoreSpecific:
µBlock.staticNetFilteringEngine.matchStringReverse(
'specifichide',
details.url
) === 2,
rawFilter: details.rawFilter
});
}
if ( entries.size === 0 ) {
return Promise.resolve();
}
const promises = [];
for ( const listKey of entries.keys() ) {
promises.push(
µb.getCompiledFilterList(listKey).then(details => {
onListLoaded(details);
})
);
}
return Promise.all(promises);
};
/******************************************************************************/
const fromNetFilter = async function(rawFilter) {
if ( typeof rawFilter !== 'string' || rawFilter === '' ) { return; }
const µb = µBlock;
const writer = new µb.CompiledLineIO.Writer();
const parser = new vAPI.StaticFilteringParser();
parser.setMaxTokenLength(µb.urlTokenizer.MAX_TOKEN_LENGTH);
parser.analyze(rawFilter);
if ( µb.staticNetFilteringEngine.compile(parser, writer) === false ) {
return;
}
await initWorker();
const id = messageId++;
worker.postMessage({
what: 'fromNetFilter',
id: id,
compiledFilter: writer.last(),
rawFilter: rawFilter
});
return new Promise(resolve => {
pendingResponses.set(id, resolve);
});
};
/******************************************************************************/
const fromCosmeticFilter = async function(details) {
if ( typeof details.rawFilter !== 'string' || details.rawFilter === '' ) {
return;
}
await initWorker();
const id = messageId++;
const hostname = µBlock.URI.hostnameFromURI(details.url);
worker.postMessage({
what: 'fromCosmeticFilter',
id: id,
domain: µBlock.URI.domainFromHostname(hostname),
hostname: hostname,
ignoreGeneric:
µBlock.staticNetFilteringEngine.matchStringReverse(
'generichide',
details.url
) === 2,
ignoreSpecific:
µBlock.staticNetFilteringEngine.matchStringReverse(
'specifichide',
details.url
) === 2,
rawFilter: details.rawFilter
});
return new Promise(resolve => {
pendingResponses.set(id, resolve);
});
};
/******************************************************************************/
// This tells the worker that filter lists may have changed.
const resetLists = function() {
needLists = true;
if ( worker === null ) { return; }
worker.postMessage({ what: 'resetLists' });
};
/******************************************************************************/
return {
fromNetFilter,
fromCosmeticFilter,
resetLists,
shutdown: stopWorker
};
return new Promise(resolve => {
pendingResponses.set(id, resolve);
});
};
// This tells the worker that filter lists may have changed.
const resetLists = function() {
needLists = true;
if ( worker === null ) { return; }
worker.postMessage({ what: 'resetLists' });
};
µBlock.staticFilteringReverseLookup = {
fromNetFilter,
fromCosmeticFilter,
resetLists,
shutdown: stopWorker
};
}
/******************************************************************************/
// <<<<< end of local scope
})();
/******************************************************************************/