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code review: reuse last decomposed hostname (hit rate = 75%)

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Raymond Hill 2018-06-03 13:27:42 -04:00
parent 46c81ea691
commit 7766786b2c
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GPG Key ID: 25E1490B761470C2
4 changed files with 83 additions and 107 deletions
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80
src/js/dynamic-net-filtering.js
View File

@ -70,41 +70,9 @@ var nameToActionMap = {
/******************************************************************************/
// For performance purpose, as simple tests as possible
var reHostnameVeryCoarse = /[g-z_-]/;
var reIPv4VeryCoarse = /\.\d+$/;
var reBadHostname = /[^0-9a-z_.\[\]:%-]/;
var reNotASCII = /[^\x20-\x7F]/;
// http://tools.ietf.org/html/rfc5952
// 4.3: "MUST be represented in lowercase"
// Also: http://en.wikipedia.org/wiki/IPv6_address#Literal_IPv6_addresses_in_network_resource_identifiers
var isIPAddress = function(hostname) {
if ( reHostnameVeryCoarse.test(hostname) ) {
return false;
}
if ( reIPv4VeryCoarse.test(hostname) ) {
return true;
}
return hostname.startsWith('[');
};
var toBroaderHostname = function(hostname) {
var pos = hostname.indexOf('.');
if ( pos !== -1 ) {
return hostname.slice(pos + 1);
}
return hostname !== '*' && hostname !== '' ? '*' : '';
};
var toBroaderIPAddress = function(ipaddress) {
return ipaddress !== '*' && ipaddress !== '' ? '*' : '';
};
var selectHostnameBroadener = function(hostname) {
return isIPAddress(hostname) ? toBroaderIPAddress : toBroaderHostname;
};
/******************************************************************************/
Matrix.prototype.reset = function() {
@ -114,6 +82,8 @@ Matrix.prototype.reset = function() {
this.z = '';
this.rules = new Map();
this.changed = false;
this.decomposedSource = [];
this.decomposedDestination = [];
};
/******************************************************************************/
@ -291,14 +261,13 @@ var domainFromHostname = µBlock.URI.domainFromHostname;
/******************************************************************************/
Matrix.prototype.evaluateCellZ = function(srcHostname, desHostname, type, broadener) {
Matrix.prototype.evaluateCellZ = function(srcHostname, desHostname, type) {
µBlock.decomposeHostname(srcHostname, this.decomposedSource);
this.type = type;
var bitOffset = typeBitOffsets[type];
var s = srcHostname;
var v;
for (;;) {
this.z = s;
v = this.rules.get(s + ' ' + desHostname);
let bitOffset = typeBitOffsets[type];
for ( let shn of this.decomposedSource ) {
this.z = shn;
let v = this.rules.get(shn + ' ' + desHostname);
if ( v !== undefined ) {
v = v >>> bitOffset & 3;
if ( v !== 0 ) {
@ -306,8 +275,6 @@ Matrix.prototype.evaluateCellZ = function(srcHostname, desHostname, type, broade
return v;
}
}
s = broadener(s);
if ( s === '' ) { break; }
}
// srcHostname is '*' at this point
this.r = 0;
@ -318,29 +285,24 @@ Matrix.prototype.evaluateCellZ = function(srcHostname, desHostname, type, broade
Matrix.prototype.evaluateCellZY = function(srcHostname, desHostname, type) {
// Pathological cases.
var d = desHostname;
if ( d === '' ) {
if ( desHostname === '' ) {
this.r = 0;
return 0;
}
// Prepare broadening handlers -- depends on whether we are dealing with
// a hostname or IP address.
var broadenSource = selectHostnameBroadener(srcHostname),
broadenDestination = selectHostnameBroadener(desHostname);
// Precedence: from most specific to least specific
// Specific-destination, any party, any type
while ( d !== '*' ) {
this.y = d;
if ( this.evaluateCellZ(srcHostname, d, '*', broadenSource) !== 0 ) {
µBlock.decomposeHostname(desHostname, this.decomposedDestination);
for ( let dhn of this.decomposedDestination ) {
if ( dhn === '*' ) { break; }
this.y = dhn;
if ( this.evaluateCellZ(srcHostname, dhn, '*') !== 0 ) {
return this.r;
}
d = broadenDestination(d);
}
var thirdParty = is3rdParty(srcHostname, desHostname);
let thirdParty = is3rdParty(srcHostname, desHostname);
// Any destination
this.y = '*';
@ -349,34 +311,34 @@ Matrix.prototype.evaluateCellZY = function(srcHostname, desHostname, type) {
if ( thirdParty ) {
// 3rd-party, specific type
if ( type === 'script' ) {
if ( this.evaluateCellZ(srcHostname, '*', '3p-script', broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', '3p-script') !== 0 ) {
return this.r;
}
} else if ( type === 'sub_frame' ) {
if ( this.evaluateCellZ(srcHostname, '*', '3p-frame', broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', '3p-frame') !== 0 ) {
return this.r;
}
}
// 3rd-party, any type
if ( this.evaluateCellZ(srcHostname, '*', '3p', broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', '3p') !== 0 ) {
return this.r;
}
} else if ( type === 'script' ) {
// 1st party, specific type
if ( this.evaluateCellZ(srcHostname, '*', '1p-script', broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', '1p-script') !== 0 ) {
return this.r;
}
}
// Any destination, any party, specific type
if ( supportedDynamicTypes.hasOwnProperty(type) ) {
if ( this.evaluateCellZ(srcHostname, '*', type, broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', type) !== 0 ) {
return this.r;
}
}
// Any destination, any party, any type
if ( this.evaluateCellZ(srcHostname, '*', '*', broadenSource) !== 0 ) {
if ( this.evaluateCellZ(srcHostname, '*', '*') !== 0 ) {
return this.r;
}

41
src/js/hnswitches.js
View File

@ -60,40 +60,12 @@ var nameToSwitchStateMap = {
/******************************************************************************/
// For performance purpose, as simple tests as possible
var reHostnameVeryCoarse = /[g-z_-]/;
var reIPv4VeryCoarse = /\.\d+$/;
var reNotASCII = /[^\x20-\x7F]/;
// http://tools.ietf.org/html/rfc5952
// 4.3: "MUST be represented in lowercase"
// Also: http://en.wikipedia.org/wiki/IPv6_address#Literal_IPv6_addresses_in_network_resource_identifiers
var isIPAddress = function(hostname) {
if ( reHostnameVeryCoarse.test(hostname) ) {
return false;
}
if ( reIPv4VeryCoarse.test(hostname) ) {
return true;
}
return hostname.startsWith('[');
};
var toBroaderHostname = function(hostname) {
var pos = hostname.indexOf('.');
if ( pos !== -1 ) {
return hostname.slice(pos + 1);
}
return hostname !== '*' && hostname !== '' ? '*' : '';
};
var toBroaderIPAddress = function(ipaddress) {
return ipaddress !== '*' && ipaddress !== '' ? '*' : '';
};
var selectHostnameBroadener = function(hostname) {
return isIPAddress(hostname) ? toBroaderIPAddress : toBroaderHostname;
};
/******************************************************************************/
HnSwitches.prototype.reset = function() {
@ -102,6 +74,7 @@ HnSwitches.prototype.reset = function() {
this.z = '';
this.r = 0;
this.changed = true;
this.decomposedSource = [];
};
/******************************************************************************/
@ -220,21 +193,17 @@ HnSwitches.prototype.evaluateZ = function(switchName, hostname) {
return false;
}
this.n = switchName;
var bits,
hn = hostname,
broadenSource = selectHostnameBroadener(hn);
for (;;) {
bits = this.switches.get(hn);
µBlock.decomposeHostname(hostname, this.decomposedSource);
for ( let shn of this.decomposedSource ) {
let bits = this.switches.get(shn);
if ( bits !== undefined ) {
bits = bits >>> bitOffset & 3;
if ( bits !== 0 ) {
this.z = hn;
this.z = shn;
this.r = bits;
return bits === 1;
}
}
hn = broadenSource(hn);
if ( hn === '' ) { break; }
}
this.r = 0;
return false;

24
src/js/url-net-filtering.js
View File

@ -137,6 +137,7 @@ URLNetFiltering.prototype.reset = function() {
this.type = '';
this.r = 0;
this.changed = false;
this.decomposedSource = [];
};
/******************************************************************************/
@ -207,32 +208,31 @@ URLNetFiltering.prototype.evaluateZ = function(context, target, type) {
if ( this.rules.size === 0 ) {
return 0;
}
var entries, pos, i, entry;
for (;;) {
this.context = context;
if ( (entries = this.rules.get(context + ' ' + type)) ) {
i = indexOfMatch(entries, target);
µBlock.decomposeHostname(context, this.decomposedSource);
for ( let shn of this.decomposedSource ) {
this.context = shn;
let entries = this.rules.get(shn + ' ' + type);
if ( entries !== undefined ) {
let i = indexOfMatch(entries, target);
if ( i !== -1 ) {
entry = entries[i];
let entry = entries[i];
this.url = entry.url;
this.type = type;
this.r = entry.action;
return this.r;
}
}
if ( (entries = this.rules.get(context + ' *')) ) {
i = indexOfMatch(entries, target);
entries = this.rules.get(shn + ' *');
if ( entries !== undefined ) {
let i = indexOfMatch(entries, target);
if ( i !== -1 ) {
entry = entries[i];
let entry = entries[i];
this.url = entry.url;
this.type = '*';
this.r = entry.action;
return this.r;
}
}
if ( context === '*' ) { break; }
pos = context.indexOf('.');
context = pos !== -1 ? context.slice(pos + 1) : '*';
}
return 0;
};

45
src/js/utils.js
View File

@ -416,3 +416,48 @@
};
/******************************************************************************/
µBlock.decomposeHostname = (function() {
// For performance purpose, as simple tests as possible
let reHostnameVeryCoarse = /[g-z_-]/;
let reIPv4VeryCoarse = /\.\d+$/;
let isIPAddress = function(hostname) {
if ( reHostnameVeryCoarse.test(hostname) ) {
return false;
}
if ( reIPv4VeryCoarse.test(hostname) ) {
return true;
}
return hostname.startsWith('[');
};
let toBroaderHostname = function(hostname) {
let pos = hostname.indexOf('.');
if ( pos !== -1 ) {
return hostname.slice(pos + 1);
}
return hostname !== '*' && hostname !== '' ? '*' : '';
};
let toBroaderIPAddress = function(ipaddress) {
return ipaddress !== '*' && ipaddress !== '' ? '*' : '';
};
return function decomposeHostname(hostname, decomposed) {
if ( decomposed.length === 0 || decomposed[0] !== hostname ) {
let broaden = isIPAddress(hostname) ?
toBroaderIPAddress :
toBroaderHostname;
decomposed[0] = hostname;
let i = 1;
for (;;) {
hostname = broaden(hostname);
if ( hostname === '' ) { break; }
decomposed[i++] = hostname;
}
decomposed.length = i;
}
return decomposed;
};
})();