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Pull request 1906: 5896-safe-browsing-cpu-ram

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Updates #5896.

Squashed commit of the following:

commit 81ac59e2f95ef3ad6ac5c4668c07c35d69570454
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Jul 4 16:07:33 2023 +0300

    hashprefix: fix cache coding
This commit is contained in:
Ainar Garipov 2023-07-04 16:17:18 +03:00
parent 97af062f7b
commit c46516475d
3 changed files with 55 additions and 3 deletions
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7
CHANGELOG.md
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@ -23,6 +23,13 @@ See also the [v0.107.34 GitHub milestone][ms-v0.107.34].
NOTE: Add new changes BELOW THIS COMMENT.
-->
### Fixed
- Excessive RAM and CPU consumption by Safe Browsing and Parental Control
filters ([#5896]).
[#5896]: https://github.com/AdguardTeam/AdGuardHome/issues/5896
<!--
NOTE: Add new changes ABOVE THIS COMMENT.
-->

7
internal/filtering/hashprefix/cache.go
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@ -25,7 +25,7 @@ func toCacheItem(data []byte) *cacheItem {
t := time.Unix(int64(binary.BigEndian.Uint64(data)), 0)
data = data[expirySize:]
hashes := make([]hostnameHash, len(data)/hashSize)
hashes := make([]hostnameHash, 0, len(data)/hashSize)
for i := 0; i < len(data); i += hashSize {
var hash hostnameHash
@ -41,9 +41,10 @@ func toCacheItem(data []byte) *cacheItem {
// fromCacheItem encodes cacheItem into data.
func fromCacheItem(item *cacheItem) (data []byte) {
data = make([]byte, len(item.hashes)*hashSize+expirySize)
data = make([]byte, 0, len(item.hashes)*hashSize+expirySize)
expiry := item.expiry.Unix()
binary.BigEndian.PutUint64(data[:expirySize], uint64(expiry))
data = binary.BigEndian.AppendUint64(data, uint64(expiry))
for _, v := range item.hashes {
// nolint:looppointer // The subsilce is used for a copy.

44
internal/filtering/hashprefix/cache_internal_test.go Normal file
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@ -0,0 +1,44 @@
package hashprefix
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestCacheItem(t *testing.T) {
item := &cacheItem{
expiry: time.Unix(0x01_23_45_67_89_AB_CD_EF, 0),
hashes: []hostnameHash{{
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
}, {
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
}},
}
wantData := []byte{
0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
0x01, 0x03, 0x05, 0x07, 0x02, 0x04, 0x06, 0x08,
}
gotData := fromCacheItem(item)
assert.Equal(t, wantData, gotData)
newItem := toCacheItem(gotData)
gotData = fromCacheItem(newItem)
assert.Equal(t, wantData, gotData)
}