PG-1504 Remove side effects from checkEncryptionStatus()

A function with that name should not have side effects so let's add
a function which only checks if a table should be encrypted based on
the AM.

contrib/pg_tde/src/pg_tde_event_capture.c

@@ -46,6 +46,15 @@ GetCurrentTdeCreateEvent(void)
 	return &tdeCurrentCreateEvent;
 }
 
+static bool
+shouldEncryptTable(const char *accessMethod)
+{
+	if (accessMethod)
+		return strcmp(accessMethod, "tde_heap") == 0;
+	else
+		return strcmp(default_table_access_method, "tde_heap") == 0;
+}
+
 static void
 checkPrincipalKeyConfigured(void)
 {
@@ -56,17 +65,8 @@ checkPrincipalKeyConfigured(void)
 }
 
 static void
-checkEncryptionClause(const char *accessMethod)
+checkEncryptionStatus(void)
 {
-	if (accessMethod && strcmp(accessMethod, "tde_heap") == 0)
-	{
-		tdeCurrentCreateEvent.encryptMode = true;
-	}
-	else if (accessMethod == NULL && strcmp(default_table_access_method, "tde_heap") == 0)
-	{
-		tdeCurrentCreateEvent.encryptMode = true;
-	}
-
 	if (tdeCurrentCreateEvent.encryptMode)
 	{
 		checkPrincipalKeyConfigured();
@@ -155,27 +155,30 @@ pg_tde_ddl_command_start_capture(PG_FUNCTION_ARGS)
 	else if (IsA(parsetree, CreateStmt))
 	{
 		CreateStmt *stmt = (CreateStmt *) parsetree;
-		const char *accessMethod = stmt->accessMethod;
 
 		validateCurrentEventTriggerState(true);
 		tdeCurrentCreateEvent.tid = GetCurrentFullTransactionId();
 
-
 		tdeCurrentCreateEvent.relation = stmt->relation;
 
-		checkEncryptionClause(accessMethod);
+		if (shouldEncryptTable(stmt->accessMethod))
+			tdeCurrentCreateEvent.encryptMode = true;
+
+		checkEncryptionStatus();
 	}
 	else if (IsA(parsetree, CreateTableAsStmt))
 	{
 		CreateTableAsStmt *stmt = (CreateTableAsStmt *) parsetree;
-		const char *accessMethod = stmt->into->accessMethod;
 
 		validateCurrentEventTriggerState(true);
 		tdeCurrentCreateEvent.tid = GetCurrentFullTransactionId();
 
 		tdeCurrentCreateEvent.relation = stmt->into->rel;
 
-		checkEncryptionClause(accessMethod);
+		if (shouldEncryptTable(stmt->into->accessMethod))
+			tdeCurrentCreateEvent.encryptMode = true;
+
+		checkEncryptionStatus();
 	}
 	else if (IsA(parsetree, AlterTableStmt))
 	{
@@ -192,13 +195,15 @@ pg_tde_ddl_command_start_capture(PG_FUNCTION_ARGS)
 
 			if (cmd->subtype == AT_SetAccessMethod)
 			{
-				const char *accessMethod = cmd->name;
-
 				tdeCurrentCreateEvent.relation = stmt->relation;
 				tdeCurrentCreateEvent.baseTableOid = relationId;
 				tdeCurrentCreateEvent.alterAccessMethodMode = true;
 
-				checkEncryptionClause(accessMethod);
+				if (shouldEncryptTable(cmd->name))
+					tdeCurrentCreateEvent.encryptMode = true;
+
+				checkEncryptionStatus();
+
 				alterSetAccessMethod = true;
 			}
 		}