telegraf/metric/tracking.go

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package metric
import (
"log"
"runtime"
"sync/atomic"
"github.com/influxdata/telegraf"
)
// NotifyFunc is called when a tracking metric is done being processed with
// the tracking information.
type NotifyFunc = func(track telegraf.DeliveryInfo)
// WithTracking adds tracking to the metric and registers the notify function
// to be called when processing is complete.
func WithTracking(metric telegraf.Metric, fn NotifyFunc) (telegraf.Metric, telegraf.TrackingID) {
return newTrackingMetric(metric, fn)
}
// WithBatchTracking adds tracking to the metrics and registers the notify
// function to be called when processing is complete.
func WithGroupTracking(metric []telegraf.Metric, fn NotifyFunc) ([]telegraf.Metric, telegraf.TrackingID) {
return newTrackingMetricGroup(metric, fn)
}
func EnableDebugFinalizer() {
finalizer = debugFinalizer
}
var (
lastID uint64
finalizer func(*trackingData)
)
func newTrackingID() telegraf.TrackingID {
return telegraf.TrackingID(atomic.AddUint64(&lastID, 1))
}
func debugFinalizer(d *trackingData) {
rc := atomic.LoadInt32(&d.rc)
if rc != 0 {
log.Fatalf("E! [agent] metric collected with non-zero reference count rc: %d", rc)
}
}
type trackingData struct {
id telegraf.TrackingID
rc int32
acceptCount int32
rejectCount int32
notifyFunc NotifyFunc
}
func (d *trackingData) incr() {
atomic.AddInt32(&d.rc, 1)
}
func (d *trackingData) decr() int32 {
return atomic.AddInt32(&d.rc, -1)
}
func (d *trackingData) accept() {
atomic.AddInt32(&d.acceptCount, 1)
}
func (d *trackingData) reject() {
atomic.AddInt32(&d.rejectCount, 1)
}
func (d *trackingData) notify() {
d.notifyFunc(
&deliveryInfo{
id: d.id,
accepted: int(d.acceptCount),
rejected: int(d.rejectCount),
},
)
}
type trackingMetric struct {
telegraf.Metric
d *trackingData
}
func newTrackingMetric(metric telegraf.Metric, fn NotifyFunc) (telegraf.Metric, telegraf.TrackingID) {
m := &trackingMetric{
Metric: metric,
d: &trackingData{
id: newTrackingID(),
rc: 1,
acceptCount: 0,
rejectCount: 0,
notifyFunc: fn,
},
}
if finalizer != nil {
runtime.SetFinalizer(m.d, finalizer)
}
return m, m.d.id
}
func newTrackingMetricGroup(group []telegraf.Metric, fn NotifyFunc) ([]telegraf.Metric, telegraf.TrackingID) {
d := &trackingData{
id: newTrackingID(),
rc: 0,
acceptCount: 0,
rejectCount: 0,
notifyFunc: fn,
}
for i, m := range group {
d.incr()
dm := &trackingMetric{
Metric: m,
d: d,
}
group[i] = dm
}
if finalizer != nil {
runtime.SetFinalizer(d, finalizer)
}
if len(group) == 0 {
d.notify()
}
return group, d.id
}
func (m *trackingMetric) Copy() telegraf.Metric {
m.d.incr()
return &trackingMetric{
Metric: m.Metric.Copy(),
d: m.d,
}
}
func (m *trackingMetric) Accept() {
m.d.accept()
m.decr()
}
func (m *trackingMetric) Reject() {
m.d.reject()
m.decr()
}
func (m *trackingMetric) Drop() {
m.decr()
}
func (m *trackingMetric) decr() {
v := m.d.decr()
if v < 0 {
panic("negative refcount")
}
if v == 0 {
m.d.notify()
}
}
type deliveryInfo struct {
id telegraf.TrackingID
accepted int
rejected int
}
func (r *deliveryInfo) ID() telegraf.TrackingID {
return r.id
}
func (r *deliveryInfo) Delivered() bool {
return r.rejected == 0
}