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server.go
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96 lines (86 loc) · 1.75 KB
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package main
import (
"context"
"fmt"
"log"
"net"
"sync"
)
// Server represents an FTP server
type Server struct {
port int
listener net.Listener
config Config
mu sync.Mutex
conns map[*FTPConn]struct{}
}
// NewServer creates a new FTP server
func NewServer(port int, config Config) (*Server, error) {
return &Server{
port: port,
config: config,
conns: make(map[*FTPConn]struct{}),
}, nil
}
// Start starts the FTP server
func (s *Server) Start(ctx context.Context) error {
laddr := fmt.Sprintf(":%d", s.port)
listener, err := net.Listen("tcp", laddr)
if err != nil {
return fmt.Errorf("failed to listen: %w", err)
}
s.listener = listener
defer listener.Close()
log.Printf("FTP server listening on %s", laddr)
// Accept connections in a goroutine
connChan := make(chan net.Conn)
go func() {
for {
conn, err := listener.Accept()
if err != nil {
select {
case <-ctx.Done():
return
default:
log.Printf("Accept error: %v", err)
continue
}
}
connChan <- conn
}
}()
// Handle connections
for {
select {
case <-ctx.Done():
log.Println("Shutting down server...")
s.closeAllConnections()
return nil
case conn := <-connChan:
log.Printf("New connection from %s", conn.RemoteAddr())
ftpConn := NewFTPConn(conn, s.config)
s.trackConnection(ftpConn)
go func() {
defer s.untrackConnection(ftpConn)
ftpConn.Handle()
}()
}
}
}
func (s *Server) trackConnection(conn *FTPConn) {
s.mu.Lock()
s.conns[conn] = struct{}{}
s.mu.Unlock()
}
func (s *Server) untrackConnection(conn *FTPConn) {
s.mu.Lock()
delete(s.conns, conn)
s.mu.Unlock()
}
func (s *Server) closeAllConnections() {
s.mu.Lock()
defer s.mu.Unlock()
for conn := range s.conns {
conn.Close()
}
}