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// Circonus Metrics Sink
package circonus
import (
"strings"
"github.com/armon/go-metrics"
cgm "github.com/circonus-labs/circonus-gometrics"
)
// CirconusSink provides an interface to forward metrics to Circonus with
// automatic check creation and metric management
type CirconusSink struct {
metrics *cgm.CirconusMetrics
}
// Config options for CirconusSink
// See https://github.com/circonus-labs/circonus-gometrics for configuration options
type Config cgm.Config
// NewCirconusSink - create new metric sink for circonus
//
// one of the following must be supplied:
// - API Token - search for an existing check or create a new check
// - API Token + Check Id - the check identified by check id will be used
// - API Token + Check Submission URL - the check identified by the submission url will be used
// - Check Submission URL - the check identified by the submission url will be used
// metric management will be *disabled*
//
// Note: If submission url is supplied w/o an api token, the public circonus ca cert will be used
// to verify the broker for metrics submission.
func NewCirconusSink(cc *Config) (*CirconusSink, error) {
cfg := cgm.Config{}
if cc != nil {
cfg = cgm.Config(*cc)
}
metrics, err := cgm.NewCirconusMetrics(&cfg)
if err != nil {
return nil, err
}
return &CirconusSink{
metrics: metrics,
}, nil
}
// Start submitting metrics to Circonus (flush every SubmitInterval)
func (s *CirconusSink) Start() {
s.metrics.Start()
}
// Flush manually triggers metric submission to Circonus
func (s *CirconusSink) Flush() {
s.metrics.Flush()
}
// SetGauge sets value for a gauge metric
func (s *CirconusSink) SetGauge(key []string, val float32) {
flatKey := s.flattenKey(key)
s.metrics.SetGauge(flatKey, int64(val))
}
// SetGaugeWithLabels sets value for a gauge metric with the given labels
func (s *CirconusSink) SetGaugeWithLabels(key []string, val float32, labels []metrics.Label) {
flatKey := s.flattenKeyLabels(key, labels)
s.metrics.SetGauge(flatKey, int64(val))
}
// EmitKey is not implemented in circonus
func (s *CirconusSink) EmitKey(key []string, val float32) {
// NOP
}
// IncrCounter increments a counter metric
func (s *CirconusSink) IncrCounter(key []string, val float32) {
flatKey := s.flattenKey(key)
s.metrics.IncrementByValue(flatKey, uint64(val))
}
// IncrCounterWithLabels increments a counter metric with the given labels
func (s *CirconusSink) IncrCounterWithLabels(key []string, val float32, labels []metrics.Label) {
flatKey := s.flattenKeyLabels(key, labels)
s.metrics.IncrementByValue(flatKey, uint64(val))
}
// AddSample adds a sample to a histogram metric
func (s *CirconusSink) AddSample(key []string, val float32) {
flatKey := s.flattenKey(key)
s.metrics.RecordValue(flatKey, float64(val))
}
// AddSampleWithLabels adds a sample to a histogram metric with the given labels
func (s *CirconusSink) AddSampleWithLabels(key []string, val float32, labels []metrics.Label) {
flatKey := s.flattenKeyLabels(key, labels)
s.metrics.RecordValue(flatKey, float64(val))
}
// Flattens key to Circonus metric name
func (s *CirconusSink) flattenKey(parts []string) string {
joined := strings.Join(parts, "`")
return strings.Map(func(r rune) rune {
switch r {
case ' ':
return '_'
default:
return r
}
}, joined)
}
// Flattens the key along with labels for formatting, removes spaces
func (s *CirconusSink) flattenKeyLabels(parts []string, labels []metrics.Label) string {
for _, label := range labels {
parts = append(parts, label.Value)
}
return s.flattenKey(parts)
}