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-rw-r--r--metrics/librato/librato.go235
1 files changed, 235 insertions, 0 deletions
diff --git a/metrics/librato/librato.go b/metrics/librato/librato.go
new file mode 100644
index 000000000..f8c8c9ecb
--- /dev/null
+++ b/metrics/librato/librato.go
@@ -0,0 +1,235 @@
+package librato
+
+import (
+ "fmt"
+ "log"
+ "math"
+ "regexp"
+ "time"
+
+ "github.com/ethereum/go-ethereum/metrics"
+)
+
+// a regexp for extracting the unit from time.Duration.String
+var unitRegexp = regexp.MustCompile(`[^\\d]+$`)
+
+// a helper that turns a time.Duration into librato display attributes for timer metrics
+func translateTimerAttributes(d time.Duration) (attrs map[string]interface{}) {
+ attrs = make(map[string]interface{})
+ attrs[DisplayTransform] = fmt.Sprintf("x/%d", int64(d))
+ attrs[DisplayUnitsShort] = string(unitRegexp.Find([]byte(d.String())))
+ return
+}
+
+type Reporter struct {
+ Email, Token string
+ Namespace string
+ Source string
+ Interval time.Duration
+ Registry metrics.Registry
+ Percentiles []float64 // percentiles to report on histogram metrics
+ TimerAttributes map[string]interface{} // units in which timers will be displayed
+ intervalSec int64
+}
+
+func NewReporter(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) *Reporter {
+ return &Reporter{e, t, "", s, d, r, p, translateTimerAttributes(u), int64(d / time.Second)}
+}
+
+func Librato(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) {
+ NewReporter(r, d, e, t, s, p, u).Run()
+}
+
+func (self *Reporter) Run() {
+ log.Printf("WARNING: This client has been DEPRECATED! It has been moved to https://github.com/mihasya/go-metrics-librato and will be removed from rcrowley/go-metrics on August 5th 2015")
+ ticker := time.Tick(self.Interval)
+ metricsApi := &LibratoClient{self.Email, self.Token}
+ for now := range ticker {
+ var metrics Batch
+ var err error
+ if metrics, err = self.BuildRequest(now, self.Registry); err != nil {
+ log.Printf("ERROR constructing librato request body %s", err)
+ continue
+ }
+ if err := metricsApi.PostMetrics(metrics); err != nil {
+ log.Printf("ERROR sending metrics to librato %s", err)
+ continue
+ }
+ }
+}
+
+// calculate sum of squares from data provided by metrics.Histogram
+// see http://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
+func sumSquares(s metrics.Sample) float64 {
+ count := float64(s.Count())
+ sumSquared := math.Pow(count*s.Mean(), 2)
+ sumSquares := math.Pow(count*s.StdDev(), 2) + sumSquared/count
+ if math.IsNaN(sumSquares) {
+ return 0.0
+ }
+ return sumSquares
+}
+func sumSquaresTimer(t metrics.Timer) float64 {
+ count := float64(t.Count())
+ sumSquared := math.Pow(count*t.Mean(), 2)
+ sumSquares := math.Pow(count*t.StdDev(), 2) + sumSquared/count
+ if math.IsNaN(sumSquares) {
+ return 0.0
+ }
+ return sumSquares
+}
+
+func (self *Reporter) BuildRequest(now time.Time, r metrics.Registry) (snapshot Batch, err error) {
+ snapshot = Batch{
+ // coerce timestamps to a stepping fn so that they line up in Librato graphs
+ MeasureTime: (now.Unix() / self.intervalSec) * self.intervalSec,
+ Source: self.Source,
+ }
+ snapshot.Gauges = make([]Measurement, 0)
+ snapshot.Counters = make([]Measurement, 0)
+ histogramGaugeCount := 1 + len(self.Percentiles)
+ r.Each(func(name string, metric interface{}) {
+ if self.Namespace != "" {
+ name = fmt.Sprintf("%s.%s", self.Namespace, name)
+ }
+ measurement := Measurement{}
+ measurement[Period] = self.Interval.Seconds()
+ switch m := metric.(type) {
+ case metrics.Counter:
+ if m.Count() > 0 {
+ measurement[Name] = fmt.Sprintf("%s.%s", name, "count")
+ measurement[Value] = float64(m.Count())
+ measurement[Attributes] = map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ }
+ snapshot.Counters = append(snapshot.Counters, measurement)
+ }
+ case metrics.Gauge:
+ measurement[Name] = name
+ measurement[Value] = float64(m.Value())
+ snapshot.Gauges = append(snapshot.Gauges, measurement)
+ case metrics.GaugeFloat64:
+ measurement[Name] = name
+ measurement[Value] = m.Value()
+ snapshot.Gauges = append(snapshot.Gauges, measurement)
+ case metrics.Histogram:
+ if m.Count() > 0 {
+ gauges := make([]Measurement, histogramGaugeCount)
+ s := m.Sample()
+ measurement[Name] = fmt.Sprintf("%s.%s", name, "hist")
+ measurement[Count] = uint64(s.Count())
+ measurement[Max] = float64(s.Max())
+ measurement[Min] = float64(s.Min())
+ measurement[Sum] = float64(s.Sum())
+ measurement[SumSquares] = sumSquares(s)
+ gauges[0] = measurement
+ for i, p := range self.Percentiles {
+ gauges[i+1] = Measurement{
+ Name: fmt.Sprintf("%s.%.2f", measurement[Name], p),
+ Value: s.Percentile(p),
+ Period: measurement[Period],
+ }
+ }
+ snapshot.Gauges = append(snapshot.Gauges, gauges...)
+ }
+ case metrics.Meter:
+ measurement[Name] = name
+ measurement[Value] = float64(m.Count())
+ snapshot.Counters = append(snapshot.Counters, measurement)
+ snapshot.Gauges = append(snapshot.Gauges,
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "1min"),
+ Value: m.Rate1(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "5min"),
+ Value: m.Rate5(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "15min"),
+ Value: m.Rate15(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ )
+ case metrics.Timer:
+ measurement[Name] = name
+ measurement[Value] = float64(m.Count())
+ snapshot.Counters = append(snapshot.Counters, measurement)
+ if m.Count() > 0 {
+ libratoName := fmt.Sprintf("%s.%s", name, "timer.mean")
+ gauges := make([]Measurement, histogramGaugeCount)
+ gauges[0] = Measurement{
+ Name: libratoName,
+ Count: uint64(m.Count()),
+ Sum: m.Mean() * float64(m.Count()),
+ Max: float64(m.Max()),
+ Min: float64(m.Min()),
+ SumSquares: sumSquaresTimer(m),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: self.TimerAttributes,
+ }
+ for i, p := range self.Percentiles {
+ gauges[i+1] = Measurement{
+ Name: fmt.Sprintf("%s.timer.%2.0f", name, p*100),
+ Value: m.Percentile(p),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: self.TimerAttributes,
+ }
+ }
+ snapshot.Gauges = append(snapshot.Gauges, gauges...)
+ snapshot.Gauges = append(snapshot.Gauges,
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "rate.1min"),
+ Value: m.Rate1(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "rate.5min"),
+ Value: m.Rate5(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ Measurement{
+ Name: fmt.Sprintf("%s.%s", name, "rate.15min"),
+ Value: m.Rate15(),
+ Period: int64(self.Interval.Seconds()),
+ Attributes: map[string]interface{}{
+ DisplayUnitsLong: Operations,
+ DisplayUnitsShort: OperationsShort,
+ DisplayMin: "0",
+ },
+ },
+ )
+ }
+ }
+ })
+ return
+}
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