Add DNS Bootstrapping

This commit is contained in:
Jarrad Hope 2014-03-06 19:01:38 +01:00
parent be543a6d17
commit 8162aff8cf

View File

@ -262,21 +262,46 @@ func (s *Ethereum) Start() {
go s.ReapDeadPeerHandler() go s.ReapDeadPeerHandler()
if ethutil.Config.Seed { if ethutil.Config.Seed {
ethutil.Config.Log.Debugln("Seeding") ethutil.Config.Log.Debugln("Seeding")
// Testnet seed bootstrapping // DNS Bootstrapping
resp, err := http.Get("https://www.ethereum.org/servers.poc3.txt") _, nodes, err := net.LookupSRV("eth", "tcp", "ethereum.org")
if err != nil { if(err == nil) {
log.Println("Fetching seed failed:", err) peers := []string{}
return // Iterate SRV nodes
} for _, n := range nodes {
defer resp.Body.Close() target := n.Target
body, err := ioutil.ReadAll(resp.Body) port := n.Port
if err != nil { // Resolve target to ip (Go returns list, so may resolve to multiple ips?)
log.Println("Reading seed failed:", err) addr, err := net.LookupHost(target)
return if(err == nil) {
} for _, a := range addr {
// Build string out of SRV port and Resolved IP
peer := net.JoinHostPort(a, strconv.Itoa(int(port)))
log.Println("Found DNS Bootstrap Peer:", peer)
peers = append(peers, peer)
}
} else {
log.Println("Couldn't resolve :", target)
}
}
// Connect to Peer list
s.ProcessPeerList(peers)
} else {
// Fallback to servers.poc3.txt
resp, err := http.Get("http://www.ethereum.org/servers.poc3.txt")
if err != nil {
log.Println("Fetching seed failed:", err)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println("Reading seed failed:", err)
return
}
s.ConnectToPeer(string(body)) s.ConnectToPeer(string(body))
}
} }
} }