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