feat: Waku v2 bridge

Issue #12610

vendor/github.com/anacrolix/dht/v2/node.go

@@ -0,0 +1,56 @@
+package dht
+
+import (
+	"time"
+
+	"github.com/anacrolix/dht/v2/int160"
+	"github.com/anacrolix/dht/v2/krpc"
+)
+
+type nodeKey struct {
+	Addr Addr
+	Id   int160.T
+}
+
+type node struct {
+	nodeKey
+
+	lastGotQuery    time.Time // From the remote node
+	lastGotResponse time.Time // From the remote node
+
+	numReceivesFrom            int
+	failedLastQuestionablePing bool
+}
+
+func (s *Server) IsQuestionable(n *node) bool {
+	return !s.IsGood(n) && !s.nodeIsBad(n)
+}
+
+func (n *node) hasAddrAndID(addr Addr, id int160.T) bool {
+	return id == n.Id && n.Addr.String() == addr.String()
+}
+
+func (n *node) IsSecure() bool {
+	return NodeIdSecure(n.Id.AsByteArray(), n.Addr.IP())
+}
+
+func (n *node) idString() string {
+	return n.Id.ByteString()
+}
+
+func (n *node) NodeInfo() (ret krpc.NodeInfo) {
+	ret.Addr = n.Addr.KRPC()
+	if n := copy(ret.ID[:], n.idString()); n != 20 {
+		panic(n)
+	}
+	return
+}
+
+// Per the spec in BEP 5.
+func (s *Server) IsGood(n *node) bool {
+	if s.nodeIsBad(n) {
+		return false
+	}
+	return time.Since(n.lastGotResponse) < 15*time.Minute ||
+		!n.lastGotResponse.IsZero() && time.Since(n.lastGotQuery) < 15*time.Minute
+}