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eval.go
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eval.go
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package kapacitor
import (
"errors"
"log"
"time"
"github.com/influxdata/kapacitor/models"
"github.com/influxdata/kapacitor/pipeline"
"github.com/influxdata/kapacitor/tick"
)
type EvalNode struct {
node
e *pipeline.EvalNode
expressions []*tick.StatefulExpr
}
// Create a new EvalNode which applies a transformation func to each point in a stream and returns a single point.
func newEvalNode(et *ExecutingTask, n *pipeline.EvalNode, l *log.Logger) (*EvalNode, error) {
if len(n.AsList) != len(n.Expressions) {
return nil, errors.New("must provide one name per expression via the 'As' property")
}
en := &EvalNode{
node: node{Node: n, et: et, logger: l},
e: n,
}
// Create stateful expressions
en.expressions = make([]*tick.StatefulExpr, len(n.Expressions))
for i, expr := range n.Expressions {
en.expressions[i] = tick.NewStatefulExpr(expr)
}
en.node.runF = en.runEval
return en, nil
}
func (e *EvalNode) runEval(snapshot []byte) error {
switch e.Provides() {
case pipeline.StreamEdge:
for p, ok := e.ins[0].NextPoint(); ok; p, ok = e.ins[0].NextPoint() {
fields, err := e.eval(p.Time, p.Fields, p.Tags)
if err != nil {
return err
}
p.Fields = fields
for _, child := range e.outs {
err := child.CollectPoint(p)
if err != nil {
return err
}
}
}
case pipeline.BatchEdge:
for b, ok := e.ins[0].NextBatch(); ok; b, ok = e.ins[0].NextBatch() {
for i, p := range b.Points {
fields, err := e.eval(p.Time, p.Fields, p.Tags)
if err != nil {
return err
}
b.Points[i].Fields = fields
}
for _, child := range e.outs {
err := child.CollectBatch(b)
if err != nil {
return err
}
}
}
}
return nil
}
func (e *EvalNode) eval(now time.Time, fields models.Fields, tags map[string]string) (models.Fields, error) {
vars, err := mergeFieldsAndTags(now, fields, tags)
if err != nil {
return nil, err
}
for i, expr := range e.expressions {
v, err := expr.EvalNum(vars)
if err != nil {
return nil, err
}
name := e.e.AsList[i]
vars.Set(name, v)
}
var newFields models.Fields
if e.e.KeepFlag {
if l := len(e.e.KeepList); l != 0 {
newFields = make(models.Fields, l)
for _, f := range e.e.KeepList {
newFields[f], err = vars.Get(f)
if err != nil {
return nil, err
}
}
} else {
newFields = make(models.Fields, len(fields)+len(e.e.AsList))
for f, v := range fields {
newFields[f] = v
}
for _, f := range e.e.AsList {
newFields[f], err = vars.Get(f)
if err != nil {
return nil, err
}
}
}
} else {
newFields = make(models.Fields, len(e.e.AsList))
for _, f := range e.e.AsList {
newFields[f], err = vars.Get(f)
if err != nil {
return nil, err
}
}
}
return newFields, nil
}