package prometheus

import (
	"runtime"
)

type goCollector struct {
	goroutines Gauge
}

// NewGoCollector returns a collector which exports metrics about the current
// go process.
func NewGoCollector() *goCollector {
	return &goCollector{
		goroutines: NewGauge(GaugeOpts{
			Name: "process_goroutines",
			Help: "Number of goroutines that currently exist.",
		}),
	}
}

// Describe returns all descriptions of the collector.
func (c *goCollector) Describe(ch chan<- *Desc) {
	ch <- c.goroutines.Desc()
}

// Collect returns the current state of all metrics of the collector.
func (c *goCollector) Collect(ch chan<- Metric) {
	c.goroutines.Set(float64(runtime.NumGoroutine()))
	ch <- c.goroutines
}