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p2p/server: add DNS resolved candidates to distributed hash table #370

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Apr 4, 2024
+22 −0
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p2p/server: add DNS resolved candidates to distributed hash table #370

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22 changes: 22 additions & 0 deletions p2p/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,12 @@ const (

// Maximum amount of time allowed for writing a complete message.
frameWriteTimeout = 20 * time.Second

// The number of DHT seed nodes got from DNS resolve
numSeedNodesFromDns = 5

// Name of eth protocol
ethProtocolName = "eth"
)

var errServerStopped = errors.New("server stopped")
Expand Down Expand Up @@ -539,6 +545,22 @@ func (srv *Server) setupDiscovery() error {
added := make(map[string]bool)
for _, proto := range srv.Protocols {
if proto.DialCandidates != nil && !added[proto.Name] {
// If the protocol is eth, the dial candidates are retrieved from
// DNS URL. We want to use the DNS discovery for bootstrap nodes
// too, so resolve some nodes from DNS and add to DHT.
if proto.Name == ethProtocolName {
for i := 0; i < numSeedNodesFromDns; i++ {
if !proto.DialCandidates.Next() {
break
}

node := proto.DialCandidates.Node()
log.Info("Add resolved DNS node to discovery bootstrap nodes", "node", node.String())
srv.BootstrapNodes = append(srv.BootstrapNodes, node)
srv.BootstrapNodesV5 = append(srv.BootstrapNodesV5, node)
}
}

srv.discmix.AddSource(proto.DialCandidates)
added[proto.Name] = true
}
Expand Down
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