[pmg-devel] [RFC pmg-api] database: use foreign keys for rule and object group attributes

[Stoiko Ivanov <s.ivanov@proxmox.com>]

the change is small, reduces code and lets the task of referential
integrity to postgresql

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
Thought I send the patch now, as once the version without the constraints
is made public adding them later is not feasible (as users might already
have inconsistent data)
gave it a minimal spin - and think it should work - but would be grateful
for a second set of eyes, from someone more experienced with postgresql

 src/PMG/Cluster.pm | 2 --
 src/PMG/DBTools.pm | 6 ++----
 src/PMG/RuleDB.pm  | 6 ------
 3 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/src/PMG/Cluster.pm b/src/PMG/Cluster.pm
index f468618..17ba44d 100644
--- a/src/PMG/Cluster.pm
+++ b/src/PMG/Cluster.pm
@@ -532,8 +532,6 @@ sub sync_ruledb_from_master {
 	$ldb->do("DELETE FROM ObjectGroup");
 	$ldb->do("DELETE FROM Object");
 	$ldb->do("DELETE FROM Attribut");
-	$ldb->do("DELETE FROM Objectgroup_Attributes");
-	$ldb->do("DELETE FROM Rule_Attributes");
 
 	eval {
 	    $rdb->begin_work;
diff --git a/src/PMG/DBTools.pm b/src/PMG/DBTools.pm
index 3e814dc..6112566 100644
--- a/src/PMG/DBTools.pm
+++ b/src/PMG/DBTools.pm
@@ -297,7 +297,7 @@ __EOD
 
 my $rule_attributes_cmd = <<__EOD;
     CREATE TABLE Rule_Attributes (
-      Rule_ID INTEGER NOT NULL,
+      Rule_ID INTEGER NOT NULL REFERENCES Rule (ID) ON DELETE CASCADE,
       Name VARCHAR(20) NOT NULL,
       Value BYTEA NULL,
       PRIMARY KEY (Rule_ID, Name)
@@ -309,7 +309,7 @@ __EOD
 
 my $object_group_attributes_cmd = <<__EOD;
     CREATE TABLE Objectgroup_Attributes (
-      Objectgroup_ID INTEGER NOT NULL,
+      Objectgroup_ID INTEGER NOT NULL REFERENCES Objectgroup (ID) ON DELETE CASCADE,
       Name VARCHAR(20) NOT NULL,
       Value BYTEA NULL,
       PRIMARY KEY (Objectgroup_ID, Name)
@@ -635,8 +635,6 @@ sub init_ruledb {
 	$dbh->do(
 	    "DELETE FROM Rule;"
 	    ." DELETE FROM RuleGroup;"
-	    ." DELETE FROM Rule_Attributes;"
-	    ." DELETE FROM Objectgroup_Attributes;"
 	    ." DELETE FROM Attribut WHERE Object_ID NOT IN ($glids);"
 	    ." DELETE FROM Object WHERE ID NOT IN ($glids);"
 	    ." DELETE FROM Objectgroup WHERE class != 'greylist';"
diff --git a/src/PMG/RuleDB.pm b/src/PMG/RuleDB.pm
index e5fe56e..315f79b 100644
--- a/src/PMG/RuleDB.pm
+++ b/src/PMG/RuleDB.pm
@@ -276,9 +276,6 @@ sub delete_group {
 	$self->{dbh}->do("DELETE FROM RuleGroup " .
 			 "WHERE Objectgroup_ID = ?", undef, $groupid);
 
-	$self->{dbh}->do("DELETE FROM Objectgroup_Attributes " .
-			 "WHERE Objectgroup_ID = ?", undef, $groupid);
-
 	$sth = $self->{dbh}->prepare("SELECT * FROM Object " .
 				      "where Objectgroup_ID = ?");
 	$sth->execute($groupid);
@@ -772,9 +769,6 @@ sub delete_rule {
 			 "WHERE ID = ?", undef, $ruleid);
 	$self->{dbh}->do("DELETE FROM RuleGroup " .
 			 "WHERE Rule_ID = ?", undef, $ruleid);
-	$self->{dbh}->do("DELETE FROM Rule_Attributes " .
-			 "WHERE Rule_ID = ?", undef, $ruleid);
-
 	$self->{dbh}->commit;
     };
     if (my $err = $@) {
-- 
2.39.2