connmgr: Remove deprecated SeedFromDNS func.

This removes the deprecated SeedFromDNS function and associated
LookupFunc type since the major version has been bumped since the last
release.

connmgr/seed.go

@@ -29,54 +29,9 @@ const (
 // seeding is successful.
 type OnSeed func(addrs []*wire.NetAddress)
 
-// LookupFunc is the signature of the DNS lookup function.
-type LookupFunc func(string) ([]net.IP, error)
-
 // DialFunc is the signature of the Dialer function.
 type DialFunc func(context.Context, string, string) (net.Conn, error)
 
-// SeedFromDNS uses DNS seeding to populate the address manager with peers.
-//
-// Deprecated: This will be removed in the next major version bump.
-func SeedFromDNS(dnsSeeds []string, defaultPort uint16, reqServices wire.ServiceFlag, lookupFn LookupFunc, seedFn OnSeed) {
-	for _, seed := range dnsSeeds {
-		host := seed
-		if reqServices != wire.SFNodeNetwork {
-			host = fmt.Sprintf("x%x.%s", uint64(reqServices), seed)
-		}
-
-		go func(host string) {
-			randSource := mrand.New(mrand.NewSource(time.Now().UnixNano()))
-
-			seedpeers, err := lookupFn(host)
-			if err != nil {
-				log.Infof("DNS discovery failed on seed %s: %v", host, err)
-				return
-			}
-			numPeers := len(seedpeers)
-
-			log.Infof("%d addresses found from DNS seed %s", numPeers, host)
-
-			if numPeers == 0 {
-				return
-			}
-			addresses := make([]*wire.NetAddress, len(seedpeers))
-			// if this errors then we have *real* problems
-			for i, peer := range seedpeers {
-				addresses[i] = wire.NewNetAddressTimestamp(
-					// bitcoind seeds with addresses from
-					// a time randomly selected between 3
-					// and 7 days ago.
-					time.Now().Add(-1*time.Second*time.Duration(secondsIn3Days+
-						randSource.Int31n(secondsIn4Days))),
-					0, peer, defaultPort)
-			}
-
-			seedFn(addresses)
-		}(host)
-	}
-}
-
 // node defines a single JSON object returned by the https seeders.
 type node struct {
 	Host            string `json:"host"`