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filters.go
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filters.go
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package discv5
import (
wenr "github.com/waku-org/go-waku/waku/v2/protocol/enr"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
)
// FilterPredicate is to create a Predicate using a custom function
func FilterPredicate(predicate func(*enode.Node) bool) Predicate {
return func(iterator enode.Iterator) enode.Iterator {
if predicate != nil {
iterator = enode.Filter(iterator, predicate)
}
return iterator
}
}
// FilterShard creates a Predicate that filters nodes that belong to a specific shard
func FilterShard(cluster, index uint16) Predicate {
return func(iterator enode.Iterator) enode.Iterator {
predicate := func(node *enode.Node) bool {
rs, err := wenr.RelaySharding(node.Record())
if err != nil || rs == nil {
return false
}
return rs.Contains(cluster, index)
}
return enode.Filter(iterator, predicate)
}
}
// FilterCapabilities creates a Predicate to filter nodes that support specific protocols
func FilterCapabilities(flags wenr.WakuEnrBitfield) Predicate {
return func(iterator enode.Iterator) enode.Iterator {
predicate := func(node *enode.Node) bool {
enrField := new(wenr.WakuEnrBitfield)
if err := node.Record().Load(enr.WithEntry(wenr.WakuENRField, &enrField)); err != nil {
return false
}
if enrField == nil {
return false
}
return *enrField&flags == flags
}
return enode.Filter(iterator, predicate)
}
}