//doJoin adds node specified in url to searchlist and nodelist.
//if nodelist>#defaultnode removes and says bye one node in nodelist and returns welcome its ip:port.
func doJoin(w http.ResponseWriter, r *http.Request) {
s, err := new(w, r)
if err != nil {
log.Println(err)
return
}
host, path, port := s.extractHost("join")
host = s.remoteIP(host)
if host == "" {
return
}
n, err := node.MakeNode(host, path, port)
if err != nil || !n.IsAllowed() {
return
}
if _, err := n.Ping(); err != nil {
return
}
suggest := manager.ReplaceNodeInList(n)
if suggest == nil {
fmt.Fprintln(s.WR, "WELCOME")
return
}
fmt.Fprintf(s.WR, "WELCOME\n%s\n", suggest.Nodestr)
}
//doUpdate adds remote node to searchlist and lookuptable with datfile specified in url.
//if stamp is in range of defaultUpdateRange adds to updateque.
func doUpdate(w http.ResponseWriter, r *http.Request) {
s, err := new(w, r)
if err != nil {
log.Println(err)
log.Println("failed to create cgi struct")
return
}
reg := regexp.MustCompile(`^update/(\w+)/(\d+)/(\w+)/([^\+]*)(\+.*)`)
m := reg.FindStringSubmatch(s.Path())
if m == nil {
log.Println("illegal url")
return
}
datfile, stamp, id, hostport, path := m[1], m[2], m[3], m[4], m[5]
host, portstr, err := net.SplitHostPort(hostport)
if err != nil {
log.Println(err)
return
}
port, err := strconv.Atoi(portstr)
if err != nil {
log.Println(err)
return
}
host = s.remoteIP(host)
if host == "" {
log.Println("host is null")
return
}
n, err := node.MakeNode(host, path, port)
if err != nil || !n.IsAllowed() {
log.Println("detects spam")
return
}
manager.AppendToTable(datfile, n)
nstamp, err := strconv.ParseInt(stamp, 10, 64)
if err != nil {
log.Println(err)
return
}
if !recentlist.IsInUpdateRange(nstamp) {
return
}
rec := record.New(datfile, id, nstamp)
go updateque.UpdateNodes(rec, n)
fmt.Fprintln(w, "OK")
}
//doBye removes from nodelist and says bye to the node specified in url.
func doBye(w http.ResponseWriter, r *http.Request) {
s, err := new(w, r)
if err != nil {
log.Println(err)
return
}
host, path, port := s.extractHost("bye")
host = s.checkRemote(host)
if host == "" {
return
}
n, err := node.MakeNode(host, path, port)
if err == nil {
manager.RemoveFromList(n)
}
fmt.Fprintln(s.WR, "BYEBYE")
}