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package metrics
import (
"fmt"
"github.com/prometheus/client_golang/prometheus"
)
type rpcServer struct{ svc *Service }
type Metric struct {
// Collector name.
Name string
// Collector value.
Value float64
// Labels associated with metric. Only for vector metrics.
Labels []string
}
// Add new metric to the designated collector.
func (rpc *rpcServer) Add(m *Metric, ok *bool) error {
c := rpc.svc.Collector(m.Name)
if c == nil {
return fmt.Errorf("undefined collector `%s`", m.Name)
}
switch c.(type) {
case prometheus.Gauge:
c.(prometheus.Gauge).Add(m.Value)
case *prometheus.GaugeVec:
if len(m.Labels) == 0 {
return fmt.Errorf("required labels for collector `%s`", m.Name)
}
c.(*prometheus.GaugeVec).WithLabelValues(m.Labels...).Add(m.Value)
case prometheus.Counter:
c.(prometheus.Counter).Add(m.Value)
case *prometheus.CounterVec:
if len(m.Labels) == 0 {
return fmt.Errorf("required labels for collector `%s`", m.Name)
}
c.(*prometheus.CounterVec).WithLabelValues(m.Labels...).Add(m.Value)
case prometheus.Summary:
c.(prometheus.Counter).Add(m.Value)
case *prometheus.SummaryVec:
if len(m.Labels) == 0 {
return fmt.Errorf("required labels for collector `%s`", m.Name)
}
c.(*prometheus.SummaryVec).WithLabelValues(m.Labels...).Observe(m.Value)
case prometheus.Histogram:
c.(prometheus.Histogram).Observe(m.Value)
case *prometheus.HistogramVec:
if len(m.Labels) == 0 {
return fmt.Errorf("required labels for collector `%s`", m.Name)
}
c.(*prometheus.HistogramVec).WithLabelValues(m.Labels...).Observe(m.Value)
}
*ok = true
return nil
}
// Set the metric value (only for gaude).
func (rpc *rpcServer) Set(m *Metric, ok *bool) error {
c := rpc.svc.Collector(m.Name)
if c == nil {
return fmt.Errorf("undefined collector `%s`", m.Name)
}
switch c.(type) {
case prometheus.Gauge:
c.(prometheus.Gauge).Set(m.Value)
case *prometheus.GaugeVec:
if len(m.Labels) == 0 {
return fmt.Errorf("required labels for collector `%s`", m.Name)
}
c.(*prometheus.GaugeVec).WithLabelValues(m.Labels...).Set(m.Value)
default:
return fmt.Errorf("collector `%s` is not `gauge` type", m.Name)
}
*ok = true
return nil
}
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