package sherpa

// Collector facilitates collection of metrics. Functions are called by the library as such events or errors occur.
// See https://github.com/irias/sherpa-prometheus-collector for an implementation for prometheus.
type Collector interface {
	ProtocolError() // Invalid request at protocol-level, e.g. wrong mimetype or request body.
	BadFunction()   // Function does not exist.
	JavaScript()    // Sherpa.js is requested.
	JSON()          // Sherpa.json is requested.

	// Call of function, how long it took, and in case of failure, the error code.
	FunctionCall(name string, durationSec float64, errorCode string)
}

type ignoreCollector struct{}

func (ignoreCollector) ProtocolError()                                                  {}
func (ignoreCollector) BadFunction()                                                    {}
func (ignoreCollector) JavaScript()                                                     {}
func (ignoreCollector) JSON()                                                           {}
func (ignoreCollector) FunctionCall(name string, durationSec float64, errorCode string) {}