AdGuardHome/internal/filtering/idgenerator.go

75 lines
1.5 KiB
Go

package filtering
import (
"fmt"
"sync/atomic"
"github.com/AdguardTeam/AdGuardHome/internal/filtering/rulelist"
"github.com/AdguardTeam/golibs/container"
"github.com/AdguardTeam/golibs/log"
)
// idGenerator generates filtering-list IDs in a way broadly compatible with the
// legacy approach of AdGuard Home.
//
// TODO(a.garipov): Get rid of this once we switch completely to the new
// rule-list architecture.
type idGenerator struct {
current *atomic.Int32
}
// newIDGenerator returns a new ID generator initialized with the given seed
// value.
func newIDGenerator(seed int32) (g *idGenerator) {
g = &idGenerator{
current: &atomic.Int32{},
}
g.current.Store(seed)
return g
}
// next returns the next ID from the generator. It is safe for concurrent use.
func (g *idGenerator) next() (id rulelist.URLFilterID) {
id32 := g.current.Add(1)
if id32 < 0 {
panic(fmt.Errorf("invalid current id value %d", id32))
}
return rulelist.URLFilterID(id32)
}
// fix ensures that flts all have unique IDs.
func (g *idGenerator) fix(flts []FilterYAML) {
set := container.NewMapSet[rulelist.URLFilterID]()
for i, f := range flts {
id := f.ID
if id == 0 {
id = g.next()
flts[i].ID = id
}
if !set.Has(id) {
set.Add(id)
continue
}
newID := g.next()
for set.Has(newID) {
newID = g.next()
}
log.Info(
"filtering: warning: filter at index %d has duplicate id %d; reassigning to %d",
i,
id,
newID,
)
flts[i].ID = newID
set.Add(newID)
}
}