#7: implement POP3 protocol server (RFC 1939, RFC 2449, STLS)

services/protocols/internal/presentation/pop3/server.go

@@ -0,0 +1,53 @@
+package pop3presentation
+
+import (
+	"net"
+
+	"lambdamail/protocols/internal/application/port"
+	appusecase "lambdamail/protocols/internal/application/usecase"
+)
+
+type Server struct {
+	addr        string
+	useCase     *appusecase.Pop3SessionUseCase
+	tlsProvider port.CertProvider
+	listener    net.Listener
+}
+
+func NewServer(addr string, useCase *appusecase.Pop3SessionUseCase, tlsProvider port.CertProvider) *Server {
+	return &Server{
+		addr:        addr,
+		useCase:     useCase,
+		tlsProvider: tlsProvider,
+	}
+}
+
+func (s *Server) ListenAndServe() error {
+	ln, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		return err
+	}
+	s.listener = ln
+	return s.Serve(ln)
+}
+
+func (s *Server) Serve(ln net.Listener) error {
+	s.listener = ln
+	for {
+		c, err := ln.Accept()
+		if err != nil {
+			return err
+		}
+		go func(rawConn net.Conn) {
+			connHandler := newConn(rawConn, s.useCase, s.tlsProvider)
+			connHandler.serve()
+		}(c)
+	}
+}
+
+func (s *Server) Close() error {
+	if s.listener != nil {
+		return s.listener.Close()
+	}
+	return nil
+}