func doPing(kadem *kademlia.Kademlia, con kademlia.Contact, addressOrId string) {
var pingAddress string
if len(strings.Split(addressOrId, string(":"))) == 2 {
pingAddress = addressOrId
} else {
id, err := kademlia.FromString(addressOrId)
if err != nil {
fmt.Printf("ERR could not interpret nodeid as ID")
return
}
con, err := kadem.ContactFromID(id)
if err != nil {
fmt.Println("ERR : unknown node")
return
}
pingAddress = contactToAddrString(con)
}
client, err := rpc.DialHTTP("tcp", pingAddress)
if err != nil {
log.Fatal("DialHTTP: ", err)
}
ping := kademlia.Ping{Sender: con}
ping.MsgID = kademlia.NewRandomID()
var pong kademlia.Pong
err = client.Call("Kademlia.Ping", ping, &pong)
if err != nil {
log.Fatal("Call: ", err)
}
if ping.MsgID.Equals(pong.MsgID) {
fmt.Print("OK\n")
} else {
fmt.Print("ERR : response message id does not match\n")
}
_ = client.Close()
}
