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Fine tune static network filtering engine code 

Notably, defer the post-load optimization operations
to a few seconds after the filters have been all
loaded in memory -- this is not a critical step for
the filtering engine to work properly, hence this
can be delayed in order to ensure readiness as soon
as possible.
This commit is contained in:
Raymond Hill 2020-11-07 13:25:01 -05:00
parent efea83a825
commit cb91d167d1
No known key found for this signature in database
GPG Key ID: 25E1490B761470C2
1 changed files with 50 additions and 39 deletions
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71
src/js/static-net-filtering.js
View File

@ -47,9 +47,9 @@ const ActionBitsMask = 0b0000000011;
const TypeBitsMask = 0b1111100000;
const TypeBitsOffset = 5;
const BlockAction = 0 << 0;
const AllowAction = 1 << 0;
const ModifyAction = 2 << 0;
const BlockAction = 0b00 << 0;
const AllowAction = 0b01 << 0;
const ModifyAction = 0b10 << 0;
// Note:
// It's possible to increase granularity of ModifyAction realm with
// sub-realms if it helps performance, but so far I found it's not
@ -59,9 +59,10 @@ const Important = 1 << 2;
const BlockImportant = BlockAction | Important;
const AnyParty = 0 << 3;
const FirstParty = 1 << 3;
const ThirdParty = 2 << 3;
const AnyParty = 0b00 << 3;
const FirstParty = 0b01 << 3;
const ThirdParty = 0b10 << 3;
const AllParties = 0b11 << 3;
const typeNameToTypeValue = {
@ -88,8 +89,8 @@ const typeNameToTypeValue = {
'inline-font': 17 << TypeBitsOffset,
'inline-script': 18 << TypeBitsOffset,
'cname': 19 << TypeBitsOffset,
'unused': 20 << TypeBitsOffset,
'redirect': 21 << TypeBitsOffset,
// 'unused': 20 << TypeBitsOffset,
// 'unused': 21 << TypeBitsOffset,
'webrtc': 22 << TypeBitsOffset,
'unsupported': 23 << TypeBitsOffset,
};
@ -137,8 +138,6 @@ const typeValueToTypeName = [
'inline-font',
'inline-script',
'cname',
'unused',
'redirect',
'webrtc',
'unsupported',
];
@ -297,6 +296,10 @@ const filterSequenceAdd = function(a, b) {
return i;
};
// TODO:
// Evaluate whether it's worth to add ability to keep track of freed
// sequence slots for reuse purpose.
const filterSequenceBufferResize = function(newSize) {
if ( newSize <= filterSequences.length ) { return; }
const size = (newSize + 0x3FFF) & ~0x3FFF;
@ -2382,8 +2385,6 @@ const FilterParser = class {
this.modifyValue = undefined;
this.invalid = false;
this.pattern = '';
this.firstParty = false;
this.thirdParty = false;
this.party = AnyParty;
this.domainOpt = '';
this.denyallowOpt = '';
@ -2427,16 +2428,10 @@ const FilterParser = class {
}
parsePartyOption(firstParty, not) {
if ( firstParty ) {
not = !not;
}
if ( not ) {
this.firstParty = true;
this.party = this.thirdParty ? AnyParty : FirstParty;
} else {
this.thirdParty = true;
this.party = this.firstParty ? AnyParty : ThirdParty;
firstParty = !firstParty;
}
this.party |= firstParty ? FirstParty : ThirdParty;
}
parseHostnameList(parser, s, modeBits, out = []) {
@ -2462,12 +2457,12 @@ const FilterParser = class {
parseOptions(parser) {
for ( let { id, val, not } of parser.netOptions() ) {
switch ( id ) {
case parser.OPTToken3p:
this.parsePartyOption(false, not);
break;
case parser.OPTToken1p:
this.parsePartyOption(true, not);
break;
case parser.OPTToken3p:
this.parsePartyOption(false, not);
break;
case parser.OPTTokenAll:
this.parseTypeOption(-1);
break;
@ -2545,6 +2540,9 @@ const FilterParser = class {
}
}
if ( this.party === AllParties ) {
this.party = AnyParty;
}
// Negated network types? Toggle on all network type bits.
// Negated non-network types can only toggle themselves.
if ( (this.notTypes & allNetworkTypesBits) !== 0 ) {
@ -2838,6 +2836,7 @@ const FilterContainer = function() {
this.anyTokenHash = urlTokenizer.anyTokenHash;
this.anyHTTPSTokenHash = urlTokenizer.anyHTTPSTokenHash;
this.anyHTTPTokenHash = urlTokenizer.anyHTTPTokenHash;
this.optimizeTimerId = undefined;
this.reset();
};
@ -2873,6 +2872,12 @@ FilterContainer.prototype.reset = function() {
filterUnits = filterUnits.slice(0, FILTER_UNITS_MIN);
filterSequenceWritePtr = FILTER_SEQUENCES_MIN;
// Cancel potentially pending optimization run.
if ( this.optimizeTimerId !== undefined ) {
self.cancelIdleCallback(this.optimizeTimerId);
this.optimizeTimerId = undefined;
}
// Runtime registers
this.$catBits = 0;
this.$tokenHash = 0;
@ -2966,25 +2971,31 @@ FilterContainer.prototype.freeze = function() {
this.badFilters.clear();
this.goodFilters.clear();
filterArgsToUnit.clear();
// Skip modify realm, since bidi-trie does not (yet) support matchAll().
// Optimizing is not critical for the static network filtering engine to
// work properly, so defer this until later to allow for reduced delay to
// readiness when no valid selfie is available.
this.optimizeTimerId = self.requestIdleCallback(( ) => {
this.optimizeTimerId = undefined;
for ( const [ catBits, bucket ] of this.categories ) {
const optimizeBits = (catBits & ActionBitsMask) === ModifyAction
? 0b10
: 0b11;
for ( const iunit of bucket.values() ) {
for ( const [ th, iunit ] of bucket ) {
const f = units[iunit];
if ( f instanceof FilterBucket === false ) { continue; }
const optimizeBits =
(th === this.noTokenHash) ||
(catBits & ActionBitsMask) === ModifyAction
? 0b10
: 0b01;
const g = f.optimize(optimizeBits);
if ( g !== undefined ) {
units[iunit] = g;
}
}
}
FilterHostnameDict.optimize();
bidiTrieOptimize();
filterArgsToUnit.clear();
}, { timeout: 15000 });
log.info(`staticNetFilteringEngine.freeze() took ${Date.now()-t0} ms`);
};