middleware/file: don't reload zone when SOA isn't changed (#707)

* middleware/file: don't reload zone when SOA isn't changed

Give Parse an extra argument which is the SOA's serial, if > 0 we check
against the just parsed SOA and then just return.

Most notable use is in reload.go which is both used in the file and auto
middleware.

Fixes #415

* PR comments

1 files changed, 2 insertions, 2 deletions

diff --git a/middleware/file/wildcard_test.go b/middleware/file/wildcard_test.go
index 9f34b13f2..f3acda4fe 100644
--- a/middleware/file/wildcard_test.go
+++ b/middleware/file/wildcard_test.go
@@ -79,7 +79,7 @@ var dnssexAuth = []dns.RR{
 }
 
 func TestLookupWildcard(t *testing.T) {
-	zone, err := Parse(strings.NewReader(dbDnssexNLSigned), testzone1, "stdin")
+	zone, err := Parse(strings.NewReader(dbDnssexNLSigned), testzone1, "stdin", 0)
 	if err != nil {
 		t.Fatalf("Expect no error when reading zone, got %q", err)
 	}
@@ -156,7 +156,7 @@ var exampleAuth = []dns.RR{
 }
 
 func TestLookupDoubleWildcard(t *testing.T) {
-	zone, err := Parse(strings.NewReader(exampleOrg), "example.org.", "stdin")
+	zone, err := Parse(strings.NewReader(exampleOrg), "example.org.", "stdin", 0)
 	if err != nil {
 		t.Fatalf("Expect no error when reading zone, got %q", err)
 	}