telegraf/agent/accumulator.go

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package agent
import (
"log"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
"github.com/influxdata/telegraf/selfstat"
)
var (
NErrors = selfstat.Register("agent", "gather_errors", map[string]string{})
)
type MetricMaker interface {
Name() string
MakeMetric(metric telegraf.Metric) telegraf.Metric
}
type accumulator struct {
maker MetricMaker
metrics chan telegraf.Metric
precision time.Duration
}
func NewAccumulator(
maker MetricMaker,
metrics chan telegraf.Metric,
) telegraf.Accumulator {
acc := accumulator{
maker: maker,
metrics: metrics,
precision: time.Nanosecond,
}
return &acc
}
func (ac *accumulator) AddFields(
measurement string,
fields map[string]interface{},
tags map[string]string,
t ...time.Time,
) {
ac.addMetric(measurement, tags, fields, telegraf.Untyped, t...)
}
func (ac *accumulator) AddGauge(
measurement string,
fields map[string]interface{},
tags map[string]string,
t ...time.Time,
) {
ac.addMetric(measurement, tags, fields, telegraf.Gauge, t...)
}
func (ac *accumulator) AddCounter(
measurement string,
fields map[string]interface{},
tags map[string]string,
t ...time.Time,
) {
ac.addMetric(measurement, tags, fields, telegraf.Counter, t...)
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}
func (ac *accumulator) AddSummary(
measurement string,
fields map[string]interface{},
tags map[string]string,
t ...time.Time,
) {
ac.addMetric(measurement, tags, fields, telegraf.Summary, t...)
}
func (ac *accumulator) AddHistogram(
measurement string,
fields map[string]interface{},
tags map[string]string,
t ...time.Time,
) {
ac.addMetric(measurement, tags, fields, telegraf.Histogram, t...)
}
func (ac *accumulator) addMetric(
measurement string,
tags map[string]string,
fields map[string]interface{},
tp telegraf.ValueType,
t ...time.Time,
) {
m, err := metric.New(measurement, tags, fields, ac.getTime(t), tp)
if err != nil {
return
}
if m := ac.maker.MakeMetric(m); m != nil {
ac.metrics <- m
}
}
// AddError passes a runtime error to the accumulator.
// The error will be tagged with the plugin name and written to the log.
func (ac *accumulator) AddError(err error) {
if err == nil {
return
}
NErrors.Incr(1)
log.Printf("E! Error in plugin [%s]: %s", ac.maker.Name(), err)
}
// SetPrecision takes two time.Duration objects. If the first is non-zero,
// it sets that as the precision. Otherwise, it takes the second argument
// as the order of time that the metrics should be rounded to, with the
// maximum being 1s.
func (ac *accumulator) SetPrecision(precision, interval time.Duration) {
if precision > 0 {
ac.precision = precision
return
}
switch {
case interval >= time.Second:
ac.precision = time.Second
case interval >= time.Millisecond:
ac.precision = time.Millisecond
case interval >= time.Microsecond:
ac.precision = time.Microsecond
default:
ac.precision = time.Nanosecond
}
}
func (ac accumulator) getTime(t []time.Time) time.Time {
var timestamp time.Time
if len(t) > 0 {
timestamp = t[0]
} else {
timestamp = time.Now()
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}
return timestamp.Round(ac.precision)
}