Add defaults to the cassandra databse type

builtin/logical/database/dbs/cassandra.go

@@ -45,8 +45,17 @@ func (c *Cassandra) CreateUser(statements Statements, username, password, expira
 		return err
 	}
 
+	creationCQL := statements.CreationStatements
+	if creationCQL == "" {
+		creationCQL = defaultCreationCQL
+	}
+	rollbackCQL := statements.RollbackStatements
+	if rollbackCQL == "" {
+		rollbackCQL = defaultRollbackCQL
+	}
+
 	// Execute each query
-	for _, query := range strutil.ParseArbitraryStringSlice(statements.CreationStatements, ";") {
+	for _, query := range strutil.ParseArbitraryStringSlice(creationCQL, ";") {
 		query = strings.TrimSpace(query)
 		if len(query) == 0 {
 			continue
@@ -57,7 +66,7 @@ func (c *Cassandra) CreateUser(statements Statements, username, password, expira
 			"password": password,
 		})).Exec()
 		if err != nil {
-			for _, query := range strutil.ParseArbitraryStringSlice(statements.RollbackStatements, ";") {
+			for _, query := range strutil.ParseArbitraryStringSlice(rollbackCQL, ";") {
 				query = strings.TrimSpace(query)
 				if len(query) == 0 {
 					continue

builtin/logical/database/dbs/db.go

@@ -94,6 +94,8 @@ type DatabaseConfig struct {
 	MaxConnectionLifetime time.Duration          `json:"max_connection_lifetime" structs:"max_connection_lifetime" mapstructure:"max_connection_lifetime"`
 }
 
+// Statments set in role creation and passed into the database type's functions.
+// TODO: Add a way of setting defaults here.
 type Statements struct {
 	CreationStatements   string `json:"creation_statments" mapstructure:"creation_statements" structs:"creation_statments"`
 	RevocationStatements string `json:"revocation_statements" mapstructure:"revocation_statements" structs:"revocation_statements"`