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package server
import (
"log"
"net"
"go.rctt.net/solec/core"
)
type RemoteServer struct {
Name string
Conn net.Conn
}
func NewRemoteServer(name string, conn net.Conn) RemoteServer {
return RemoteServer{name, conn}
}
func (s *Server) handleServerConn(conn net.Conn) {
defer conn.Close()
name, err := s.performServerAuth(conn)
if err != nil {
log.Println("server auth error:", err)
return
}
s.serversMu.RLock()
if _, ok := s.servers[name]; ok {
log.Println("server already connected")
return
}
s.serversMu.RUnlock()
rs := NewRemoteServer(name, conn)
s.serversMu.Lock()
s.servers[name] = rs
s.serversMu.Unlock()
log.Println("connection from server:", name)
defer func() {
s.serversMu.Lock()
log.Println("server disconnected: ", rs.Name)
delete(s.servers, rs.Name)
s.serversMu.Unlock()
}()
if err := s.readRemoteInput(conn); err != nil {
log.Println(err)
}
}
func (s *Server) performServerAuth(conn net.Conn) (string, error) {
payload, err := core.Decode(conn)
if err != nil {
return "", err
}
auth, ok := payload.(core.ServerAuth)
if !ok {
return "", core.ErrUnexpectedPayloadType
}
if err := core.Send(conn, core.Success{}); err != nil {
return "", err
}
return auth.Name, nil
}
func (s *Server) getRemote(name string) (RemoteServer, error) {
s.serversMu.RLock()
remote, ok := s.servers[name]
s.serversMu.RUnlock()
if ok {
return remote, nil
}
conn, err := s.initRemoteConn(name)
if err != nil {
return RemoteServer{}, err
}
rs := NewRemoteServer(name, conn)
s.serversMu.Lock()
s.servers[name] = rs
s.serversMu.Unlock()
log.Println("connected to server:", name)
return rs, nil
}
func (s *Server) initRemoteConn(name string) (net.Conn, error) {
conn, err := net.Dial("tcp", name+":9999")
if err != nil {
return conn, err
}
hs := core.Handshake{0, 1, core.ConnTypeServer}
if err := core.Send(conn, hs); err != nil {
conn.Close()
return conn, err
}
auth := core.ServerAuth{Name: s.name}
if err := core.Send(conn, auth); err != nil {
conn.Close()
return conn, err
}
return conn, nil
}
func (s *Server) readRemoteInput(conn net.Conn) error {
for {
payload, err := core.Decode(conn)
if err != nil {
return err
}
if err := s.handleRemotePayload(conn, payload); err != nil {
log.Print("handler error: ", err)
}
}
}
func (s *Server) handleRemotePayload(sender net.Conn, payload any) error {
switch v := payload.(type) {
case core.Message:
return s.handleMessage(sender, core.ConnTypeServer, v)
default:
return core.ErrUnexpectedPayloadType
}
}
|
