1 files changed, 75 insertions, 0 deletions
diff --git a/forged/internal/incoming/lmtp/lmtp.go b/forged/internal/incoming/lmtp/lmtp.go
new file mode 100644
index 0000000..cf5618c
--- /dev/null
+++ b/forged/internal/incoming/lmtp/lmtp.go
@@ -0,0 +1,75 @@
+package lmtp
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
+)
+
+type Server struct {
+	socket       string
+	domain       string
+	maxSize      int64
+	writeTimeout uint32
+	readTimeout  uint32
+}
+
+type Config struct {
+	Socket       string `scfg:"socket"`
+	Domain       string `scfg:"domain"`
+	MaxSize      int64  `scfg:"max_size"`
+	WriteTimeout uint32 `scfg:"write_timeout"`
+	ReadTimeout  uint32 `scfg:"read_timeout"`
+}
+
+func New(config Config) (server *Server) {
+	return &Server{
+		socket:       config.Socket,
+		domain:       config.Domain,
+		maxSize:      config.MaxSize,
+		writeTimeout: config.WriteTimeout,
+		readTimeout:  config.ReadTimeout,
+	}
+}
+
+func (server *Server) Run(ctx context.Context) error {
+	listener, _, err := misc.ListenUnixSocket(server.socket)
+	if err != nil {
+		return fmt.Errorf("listen unix socket for LMTP: %w", err)
+	}
+	defer func() {
+		_ = listener.Close()
+	}()
+
+	stop := context.AfterFunc(ctx, func() {
+		_ = listener.Close()
+	})
+	defer stop()
+
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			if errors.Is(err, net.ErrClosed) || ctx.Err() != nil {
+				return nil
+			}
+			return fmt.Errorf("accept conn: %w", err)
+		}
+
+		go server.handleConn(ctx, conn)
+	}
+}
+
+func (server *Server) handleConn(ctx context.Context, conn net.Conn) {
+	defer func() {
+		_ = conn.Close()
+	}()
+	unblock := context.AfterFunc(ctx, func() {
+		_ = conn.SetDeadline(time.Now())
+		_ = conn.Close()
+	})
+	defer unblock()
+}