// Returns vulcan library compatible middleware
func (c *ConnLimit) NewHandler(next http.Handler) (http.Handler, error) {
extract, err := utils.NewExtractor(c.Variable)
if err != nil {
return nil, err
}
return connlimit.New(next, extract, c.Connections)
}
func NewConnLimit(connections int64, variable string) (*ConnLimit, error) {
if _, err := utils.NewExtractor(variable); err != nil {
return nil, err
}
if connections < 0 {
return nil, fmt.Errorf("connections should be > 0, got %d", connections)
}
return &ConnLimit{
Connections: connections,
Variable: variable,
}, nil
}
func FromOther(o RateLimit) (plugin.Middleware, error) {
if o.Requests <= 0 {
return nil, fmt.Errorf("requests should be > 0, got %d", o.Requests)
}
if o.Burst < 0 {
return nil, fmt.Errorf("burst should be >= 0, got %d", o.Burst)
}
if o.PeriodSeconds <= 0 {
return nil, fmt.Errorf("period seconds should be > 0, got %d", o.PeriodSeconds)
}
extract, err := utils.NewExtractor(o.Variable)
if err != nil {
return nil, err
}
extractRates, err := makeRateExtractor(o.RateVar)
if err != nil {
return nil, err
}
o.extract = extract
o.extractRates = extractRates
return &o, nil
}