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flatten.go
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flatten.go
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package kapacitor
import (
"bytes"
"fmt"
"sync"
"time"
"github.com/influxdata/kapacitor/edge"
"github.com/influxdata/kapacitor/models"
"github.com/influxdata/kapacitor/pipeline"
)
type FlattenNode struct {
node
f *pipeline.FlattenNode
bufPool sync.Pool
}
// Create a new FlattenNode, which takes pairs from parent streams combines them into a single point.
func newFlattenNode(et *ExecutingTask, n *pipeline.FlattenNode, d NodeDiagnostic) (*FlattenNode, error) {
fn := &FlattenNode{
f: n,
node: node{Node: n, et: et, diag: d},
bufPool: sync.Pool{
New: func() interface{} { return &bytes.Buffer{} },
},
}
fn.node.runF = fn.runFlatten
return fn, nil
}
func (n *FlattenNode) runFlatten([]byte) error {
consumer := edge.NewGroupedConsumer(
n.ins[0],
n,
)
n.statMap.Set(statCardinalityGauge, consumer.CardinalityVar())
return consumer.Consume()
}
func (n *FlattenNode) NewGroup(group edge.GroupInfo, first edge.PointMeta) (edge.Receiver, error) {
t := first.Time().Round(n.f.Tolerance)
return &flattenBuffer{
n: n,
time: t,
name: first.Name(),
groupInfo: group,
}, nil
}
type flattenBuffer struct {
n *FlattenNode
time time.Time
name string
groupInfo edge.GroupInfo
points []edge.FieldsTagsTimeGetter
}
func (b *flattenBuffer) BeginBatch(begin edge.BeginBatchMessage) error {
b.n.timer.Start()
defer b.n.timer.Stop()
b.name = begin.Name()
b.time = time.Time{}
if s := begin.SizeHint(); s > cap(b.points) {
b.points = make([]edge.FieldsTagsTimeGetter, 0, s)
}
begin = begin.ShallowCopy()
begin.SetSizeHint(0)
b.n.timer.Pause()
err := edge.Forward(b.n.outs, begin)
b.n.timer.Resume()
return err
}
func (b *flattenBuffer) BatchPoint(bp edge.BatchPointMessage) error {
b.n.timer.Start()
defer b.n.timer.Stop()
t := bp.Time().Round(b.n.f.Tolerance)
bp = bp.ShallowCopy()
bp.SetTime(t)
t, fields, err := b.addPoint(bp)
if err != nil {
return err
}
if len(fields) == 0 {
return nil
}
return b.emitBatchPoint(t, fields)
}
func (b *flattenBuffer) emitBatchPoint(t time.Time, fields models.Fields) error {
// Emit batch point
flatP := edge.NewBatchPointMessage(
fields,
b.groupInfo.Tags,
t,
)
b.n.timer.Pause()
err := edge.Forward(b.n.outs, flatP)
b.n.timer.Resume()
return err
}
func (b *flattenBuffer) EndBatch(end edge.EndBatchMessage) error {
b.n.timer.Start()
defer b.n.timer.Stop()
if len(b.points) > 0 {
fields, err := b.n.flatten(b.points)
if err != nil {
return err
}
if err := b.emitBatchPoint(b.time, fields); err != nil {
return err
}
b.points = b.points[0:0]
}
b.n.timer.Pause()
err := edge.Forward(b.n.outs, end)
b.n.timer.Resume()
return err
}
func (b *flattenBuffer) Point(p edge.PointMessage) error {
b.n.timer.Start()
defer b.n.timer.Stop()
t := p.Time().Round(b.n.f.Tolerance)
p = p.ShallowCopy()
p.SetTime(t)
t, fields, err := b.addPoint(p)
if err != nil {
return err
}
if len(fields) == 0 {
return nil
}
// Emit point
flatP := edge.NewPointMessage(
b.name, "", "",
b.groupInfo.Dimensions,
fields,
b.groupInfo.Tags,
t,
)
// update the time
if t.After(b.time) {
b.time = t
}
b.n.timer.Pause()
err = edge.Forward(b.n.outs, flatP)
b.n.timer.Resume()
return err
}
func (b *flattenBuffer) addPoint(p edge.FieldsTagsTimeGetter) (next time.Time, fields models.Fields, err error) {
t := p.Time()
if !t.Equal(b.time) {
if len(b.points) > 0 {
fields, err = b.n.flatten(b.points)
if err != nil {
return
}
next = b.time
b.points = b.points[0:0]
}
// Update buffer with new time
b.time = t
}
b.points = append(b.points, p)
return
}
func (b *flattenBuffer) Barrier(barrier edge.BarrierMessage) error {
b.n.timer.Start()
defer b.n.timer.Stop()
if barrier.Time().After(b.time) && len(b.points) > 0 {
fields, err := b.n.flatten(b.points)
if err != nil {
return err
}
msg := edge.NewPointMessage(
b.name, "", "",
b.groupInfo.Dimensions,
fields,
b.groupInfo.Tags,
b.time,
)
b.n.timer.Pause()
err = edge.Forward(b.n.outs, msg)
b.n.timer.Resume()
if err != nil {
return err
}
b.points = b.points[0:0]
}
b.n.timer.Pause()
err := edge.Forward(b.n.outs, barrier)
b.n.timer.Resume()
return err
}
func (b *flattenBuffer) DeleteGroup(d edge.DeleteGroupMessage) error {
b.points = b.points[0:0]
return edge.Forward(b.n.outs, d)
}
func (b *flattenBuffer) Done() {}
func (n *FlattenNode) flatten(points []edge.FieldsTagsTimeGetter) (models.Fields, error) {
fields := make(models.Fields)
if len(points) == 0 {
return fields, nil
}
fieldPrefix := n.bufPool.Get().(*bytes.Buffer)
defer n.bufPool.Put(fieldPrefix)
POINTS:
for _, p := range points {
tags := p.Tags()
for i, tag := range n.f.Dimensions {
if v, ok := tags[tag]; ok {
if i > 0 {
fieldPrefix.WriteString(n.f.Delimiter)
}
fieldPrefix.WriteString(v)
} else {
n.diag.Error("point missing tag for flatten operation", fmt.Errorf("tag %s is missing from point", tag))
continue POINTS
}
}
l := fieldPrefix.Len()
for fname, value := range p.Fields() {
if !n.f.DropOriginalFieldNameFlag {
if l > 0 {
fieldPrefix.WriteString(n.f.Delimiter)
}
fieldPrefix.WriteString(fname)
}
fields[fieldPrefix.String()] = value
fieldPrefix.Truncate(l)
}
fieldPrefix.Reset()
}
return fields, nil
}