fix

contrib/backends/srndv2/src/srnd/spam.go

@@ -1,10 +1,13 @@
 package srnd
 
 import (
+	"errors"
 	"io"
 	"net"
 )
 
+var ErrSpamFilterNotEnabled = errors.New("spam filter access attempted when disabled")
+
 type SpamFilter struct {
 	addr    string
 	enabled bool
@@ -15,25 +18,27 @@ func (sp *SpamFilter) Configure(c SpamConfig) {
 	sp.addr = c.addr
 }
 
+func (sp *SpamFilter) Enabled() bool {
+	return sp.enabled
+}
+
 func (sp *SpamFilter) Rewrite(msg io.Reader, out io.WriteCloser) error {
 	var buff [65636]byte
-	if sp.enabled {
-		addr, err := net.ResolveTCPAddr("tcp", sp.addr)
-		if err != nil {
-			return err
-		}
-		c, err := net.DialTCP("tcp", nil, addr)
-		if err != nil {
-			return err
-		}
-		io.CopyBuffer(c, msg, buff[:])
-		c.CloseWrite()
-		_, err = io.CopyBuffer(out, c, buff[:])
-		c.Close()
-		out.Close()
+	if !sp.Enabled() {
+		return ErrSpamFilterNotEnabled
+	}
+	addr, err := net.ResolveTCPAddr("tcp", sp.addr)
+	if err != nil {
 		return err
 	}
-	io.CopyBuffer(out, msg, buff[:])
+	c, err := net.DialTCP("tcp", nil, addr)
+	if err != nil {
+		return err
+	}
+	io.CopyBuffer(c, msg, buff[:])
+	c.CloseWrite()
+	_, err = io.CopyBuffer(out, c, buff[:])
+	c.Close()
 	out.Close()
-	return nil
+	return err
 }