func (s *ShardSpace) ParsedShardDuration() time.Duration {
if s.ShardDuration != "" {
d, _ := common.ParseTimeDuration(s.ShardDuration)
return time.Duration(d)
}
return DEFAULT_SHARD_DURATION
}
func (s *ShardSpace) ParsedRetentionPeriod() time.Duration {
if s.RetentionPolicy == "" {
return DEFAULT_RETENTION_POLICY_DURATION
} else if s.RetentionPolicy == "inf" {
return InfiniteRetention
}
d, _ := common.ParseTimeDuration(s.RetentionPolicy)
return time.Duration(d)
}
func (s *ShardSpace) Validate(clusterConfig *ClusterConfiguration, checkForDb bool) error {
if clusterConfig.ShardSpaceExists(s) {
return fmt.Errorf("Shard space %s exists for db %s", s.Name, s.Database)
}
if checkForDb {
if !clusterConfig.DatabaseExists(s.Database) {
return fmt.Errorf("Database '%s' doesn't exist.", s.Database)
}
}
if s.Name == "" {
return fmt.Errorf("Shard space must have a name")
}
if s.Regex == "" {
return fmt.Errorf("A regex is required for a shard space")
}
r, err := s.compileRegex(s.Regex)
if err != nil {
return fmt.Errorf("Error parsing regex: %s", err)
}
s.compiledRegex = r
if s.Split == 0 {
s.Split = DEFAULT_SPLIT
}
if s.ReplicationFactor == 0 {
s.ReplicationFactor = DEFAULT_REPLICATION_FACTOR
}
if s.ShardDuration != "" {
if _, err := common.ParseTimeDuration(s.ShardDuration); err != nil {
return err
}
}
if s.RetentionPolicy != "" && s.RetentionPolicy != "inf" {
if _, err := common.ParseTimeDuration(s.RetentionPolicy); err != nil {
return err
}
}
return nil
}
// parse time expressions, e.g. now() - 1d
func parseTime(value *Value) (int64, error) {
if value.Type != ValueExpression {
if value.IsFunctionCall() && strings.ToLower(value.Name) == "now" {
return time.Now().UTC().UnixNano(), nil
}
if value.IsFunctionCall() {
return 0, fmt.Errorf("Invalid use of function %s", value.Name)
}
if value.Type == ValueString {
t, err := parseTimeString(value.Name)
if err != nil {
return 0, err
}
return t.UnixNano(), err
}
duration, err := common.ParseTimeDuration(value.Name)
return duration, err
}
leftValue, err := parseTime(value.Elems[0])
if err != nil {
return 0, err
}
rightValue, err := parseTime(value.Elems[1])
if err != nil {
return 0, err
}
switch value.Name {
case "+":
return leftValue + rightValue, nil
case "-":
return leftValue - rightValue, nil
default:
return 0, fmt.Errorf("Cannot use '%s' in a time expression", value.Name)
}
}