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cmd/devp2p/v5test: prefill FindnodeResults bystanders

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Csaba Kiraly 2026-03-18 09:56:51 +00:00
parent 827689c146
commit e61598bd6f
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GPG key ID: 0FE274EE8C95166E
1 changed files with 23 additions and 7 deletions
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30
cmd/devp2p/internal/v5test/discv5tests.go
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@ -263,13 +263,23 @@ that they are returned by FINDNODE.`)
defer nodes[i].close()
}
// Prefill each bystander with the full bystander set so background FINDNODE
// lookups see useful routing data instead of empty responses.
known := make([]*enode.Node, 0, len(nodes))
for _, bn := range nodes {
known = append(known, bn.conn.localNode.Node())
}
for _, bn := range nodes {
bn.known = append([]*enode.Node(nil), known...)
}
// Wait until enough bystanders have actually become live, i.e. the remote node
// has revalidated them by sending PING and receiving our PONG.
const minLiveNodes = 3
requiredLiveNodes := len(nodes)
timeout := 60 * time.Second
timeoutCh := time.After(timeout)
liveSet := make(map[enode.ID]*enode.Node)
for len(liveSet) < minLiveNodes {
for len(liveSet) < requiredLiveNodes {
select {
case id := <-liveCh:
for _, bn := range nodes {
@ -280,11 +290,11 @@ that they are returned by FINDNODE.`)
}
t.Logf("bystander node %v became live", id)
case <-timeoutCh:
t.Errorf("remote revalidated %d bystander nodes in %v, need %d to continue", len(liveSet), timeout, minLiveNodes)
t.Errorf("remote revalidated %d bystander nodes in %v, need %d to continue", len(liveSet), timeout, requiredLiveNodes)
return
}
}
t.Logf("continuing after %d bystander nodes became live", len(liveSet))
t.Logf("continuing after all %d bystander nodes became live", len(liveSet))
// Collect live nodes by distance.
var dists []uint
@ -332,9 +342,10 @@ that they are returned by FINDNODE.`)
// A bystander is a node whose only purpose is filling a spot in the remote table.
type bystander struct {
dest *enode.Node
conn *conn
l net.PacketConn
dest *enode.Node
conn *conn
l net.PacketConn
known []*enode.Node
liveCh chan enode.ID
sent map[v5wire.Nonce]v5wire.Packet
@ -404,6 +415,11 @@ func (bn *bystander) loop() {
bn.notifyLive()
case *v5wire.Findnode:
resp := &v5wire.Nodes{ReqID: append([]byte(nil), p.ReqID...), RespCount: 1}
for _, n := range bn.known {
if slices.Contains(p.Distances, uint(enode.LogDist(n.ID(), bn.id()))) {
resp.Nodes = append(resp.Nodes, n.Record())
}
}
nonce := bn.conn.writeTo(bn.l, resp, nil, from)
bn.sent[nonce] = resp
case *v5wire.TalkRequest: