Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/go-kit/kit/metrics/pcp/pcp.go

@@ -0,0 +1,125 @@
+package pcp
+
+import (
+	"github.com/performancecopilot/speed"
+
+	"github.com/go-kit/kit/metrics"
+)
+
+// Reporter encapsulates a speed client.
+type Reporter struct {
+	c *speed.PCPClient
+}
+
+// NewReporter creates a new Reporter instance. The first parameter is the
+// application name and is used to create the speed client. Hence it should be a
+// valid speed parameter name and should not contain spaces or the path
+// separator for your operating system.
+func NewReporter(appname string) (*Reporter, error) {
+	c, err := speed.NewPCPClient(appname)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Reporter{c}, nil
+}
+
+// Start starts the underlying speed client so it can start reporting registered
+// metrics to your PCP installation.
+func (r *Reporter) Start() { r.c.MustStart() }
+
+// Stop stops the underlying speed client so it can stop reporting registered
+// metrics to your PCP installation.
+func (r *Reporter) Stop() { r.c.MustStop() }
+
+// Counter implements metrics.Counter via a single dimensional speed.Counter.
+type Counter struct {
+	c speed.Counter
+}
+
+// NewCounter creates a new Counter. This requires a name parameter and can
+// optionally take a couple of description strings, that are used to create the
+// underlying speed.Counter and are reported by PCP.
+func (r *Reporter) NewCounter(name string, desc ...string) (*Counter, error) {
+	c, err := speed.NewPCPCounter(0, name, desc...)
+	if err != nil {
+		return nil, err
+	}
+
+	r.c.MustRegister(c)
+	return &Counter{c}, nil
+}
+
+// With is a no-op.
+func (c *Counter) With(labelValues ...string) metrics.Counter { return c }
+
+// Add increments Counter. speed.Counters only take int64, so delta is converted
+// to int64 before observation.
+func (c *Counter) Add(delta float64) { c.c.Inc(int64(delta)) }
+
+// Gauge implements metrics.Gauge via a single dimensional speed.Gauge.
+type Gauge struct {
+	g speed.Gauge
+}
+
+// NewGauge creates a new Gauge. This requires a name parameter and can
+// optionally take a couple of description strings, that are used to create the
+// underlying speed.Gauge and are reported by PCP.
+func (r *Reporter) NewGauge(name string, desc ...string) (*Gauge, error) {
+	g, err := speed.NewPCPGauge(0, name, desc...)
+	if err != nil {
+		return nil, err
+	}
+
+	r.c.MustRegister(g)
+	return &Gauge{g}, nil
+}
+
+// With is a no-op.
+func (g *Gauge) With(labelValues ...string) metrics.Gauge { return g }
+
+// Set sets the value of the gauge.
+func (g *Gauge) Set(value float64) { g.g.Set(value) }
+
+// Add adds a value to the gauge.
+func (g *Gauge) Add(delta float64) { g.g.Inc(delta) }
+
+// Histogram wraps a speed Histogram.
+type Histogram struct {
+	h speed.Histogram
+}
+
+// NewHistogram creates a new Histogram. The minimum observeable value is 0. The
+// maximum observeable value is 3600000000 (3.6e9).
+//
+// The required parameters are a metric name, the minimum and maximum observable
+// values, and a metric unit for the units of the observed values.
+//
+// Optionally, it can also take a couple of description strings.
+func (r *Reporter) NewHistogram(name string, min, max int64, unit speed.MetricUnit, desc ...string) (*Histogram, error) {
+	h, err := speed.NewPCPHistogram(name, min, max, 5, unit, desc...)
+	if err != nil {
+		return nil, err
+	}
+
+	r.c.MustRegister(h)
+	return &Histogram{h}, nil
+}
+
+// With is a no-op.
+func (h *Histogram) With(labelValues ...string) metrics.Histogram { return h }
+
+// Observe observes a value.
+//
+// This converts float64 value to int64 before observation, as the Histogram in
+// speed is backed using codahale/hdrhistogram, which only observes int64
+// values. Additionally, the value is interpreted in the metric unit used to
+// construct the histogram.
+func (h *Histogram) Observe(value float64) { h.h.MustRecord(int64(value)) }
+
+// Mean returns the mean of the values observed so far by the Histogram.
+func (h *Histogram) Mean() float64 { return h.h.Mean() }
+
+// Percentile returns a percentile value for the given percentile
+// between 0 and 100 for all values observed by the histogram.
+func (h *Histogram) Percentile(p float64) int64 { return h.h.Percentile(p) }