p2p, p2p/discover: add signed ENR generation (#17753)

This PR adds enode.LocalNode and integrates it into the p2p
subsystem. This new object is the keeper of the local node
record. For now, a new version of the record is produced every
time the client restarts. We'll make it smarter to avoid that in
the future.

There are a couple of other changes in this commit: discovery now
waits for all of its goroutines at shutdown and the p2p server
now closes the node database after discovery has shut down. This
fixes a leveldb crash in tests. p2p server startup is faster
because it doesn't need to wait for the external IP query
anymore.

1 files changed, 2 insertions, 1 deletions

diff --git a/p2p/discv5/udp.go b/p2p/discv5/udp.go
index 49e1cb811..ff5ed983b 100644
--- a/p2p/discv5/udp.go
+++ b/p2p/discv5/udp.go
@@ -230,7 +230,8 @@ type udp struct {
 }
 
 // ListenUDP returns a new table that listens for UDP packets on laddr.
-func ListenUDP(priv *ecdsa.PrivateKey, conn conn, realaddr *net.UDPAddr, nodeDBPath string, netrestrict *netutil.Netlist) (*Network, error) {
+func ListenUDP(priv *ecdsa.PrivateKey, conn conn, nodeDBPath string, netrestrict *netutil.Netlist) (*Network, error) {
+	realaddr := conn.LocalAddr().(*net.UDPAddr)
 	transport, err := listenUDP(priv, conn, realaddr)
 	if err != nil {
 		return nil, err