/
drill_merger.go
191 lines (165 loc) · 4.18 KB
/
drill_merger.go
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package processor
import (
"context"
"fmt"
"log"
"math"
"sort"
"strings"
"github.com/nci/gsky/utils"
pb "github.com/nci/gsky/worker/gdalservice"
)
type DrillMerger struct {
Context context.Context
In chan *DrillResult
Out chan string
Error chan error
}
func NewDrillMerger(ctx context.Context, errChan chan error) *DrillMerger {
return &DrillMerger{
Context: ctx,
In: make(chan *DrillResult, 100),
Out: make(chan string),
Error: errChan,
}
}
func (dm *DrillMerger) Run(suffix string, namespaces []string, templateFileName string, bandExpr *utils.BandExpressions, decileCount int, verbose bool) {
if verbose {
defer log.Printf("Drill Merger done")
}
defer close(dm.Out)
results := make(map[string]map[string][]*pb.TimeSeries)
var drillResult *DrillResult
for drillRes := range dm.In {
if _, ok := results[drillRes.NameSpace]; !ok {
results[drillRes.NameSpace] = make(map[string][]*pb.TimeSeries)
nsFound := false
for _, ns := range namespaces {
if ns == drillRes.NameSpace {
nsFound = true
break
}
}
if !nsFound {
namespaces = append(namespaces, drillRes.NameSpace)
}
}
for i, date := range drillRes.Dates {
isoDate := date.Format(ISOFormat)
if _, ok := results[drillRes.NameSpace][isoDate]; !ok {
results[drillRes.NameSpace][isoDate] = []*pb.TimeSeries{drillRes.Data[i]}
} else {
results[drillRes.NameSpace][isoDate] = append(results[drillRes.NameSpace][isoDate], drillRes.Data[i])
}
}
if drillResult == nil {
drillResult = drillRes
}
}
if len(results) == 0 {
return
}
var dates []string
for ts := range results[namespaces[0]] {
dates = append(dates, ts)
}
sort.Strings(dates)
var csv strings.Builder
for _, key := range dates {
values := map[string]float64{}
for _, ns := range namespaces {
total := 0.0
count := 0
for _, data := range results[ns][key] {
if !math.IsNaN(data.Value) {
total += data.Value * float64(data.Count)
count += int(data.Count)
}
}
if !math.IsNaN(total) && count > 0 {
values[ns] = total / float64(count)
}
}
fmt.Fprintf(&csv, "%s", key)
if len(bandExpr.Expressions) == 0 {
for _, ns := range namespaces {
fmt.Fprint(&csv, ",")
if val, ok := values[ns]; ok {
fmt.Fprintf(&csv, "%f", val)
}
}
fmt.Fprint(&csv, "\\n")
continue
}
nCols := 1 + decileCount
for ix, expr := range bandExpr.Expressions {
for ic := 0; ic < nCols; ic++ {
noData := false
for _, variable := range bandExpr.ExprVarRef[ix] {
varCol := variable
if ic > 0 {
varCol = variable + fmt.Sprintf(DecileNamespace, ic)
}
if _, ok := values[varCol]; !ok {
noData = true
break
}
}
fmt.Fprint(&csv, ",")
if noData {
continue
}
parameters := make(map[string]interface{}, len(bandExpr.ExprVarRef[ix]))
for _, variable := range bandExpr.ExprVarRef[ix] {
varCol := variable
if ic > 0 {
varCol = variable + fmt.Sprintf(DecileNamespace, ic)
}
parameters[variable] = values[varCol]
}
result, err := expr.Evaluate(parameters)
if err != nil {
dm.sendError(fmt.Errorf("WPS: Eval '%v' error: %v", bandExpr.ExprText[ix], err))
return
}
val, ok := result.(float32)
if !ok {
dm.sendError(fmt.Errorf("WPS: Failed to cast eval results '%v' to float32, %v", val, bandExpr.ExprText[ix]))
return
}
if drillResult != nil && float32(drillResult.NoData) != val {
fmt.Fprintf(&csv, "%f", float64(val))
}
}
}
fmt.Fprint(&csv, "\\n")
}
var out strings.Builder
err := utils.ExecuteWriteTemplateFile(&out, csv.String(), templateFileName)
if err != nil {
dm.sendError(fmt.Errorf("WPS: output template error: %v", err))
return
}
if dm.checkCancellation() {
return
}
dm.Out <- fmt.Sprintf(out.String(), suffix)
}
func (dm *DrillMerger) sendError(err error) {
select {
case dm.Error <- err:
default:
}
}
func (dm *DrillMerger) checkCancellation() bool {
select {
case <-dm.Context.Done():
dm.sendError(fmt.Errorf("Drill Merger: context has been cancel: %v", dm.Context.Err()))
return true
case err := <-dm.Error:
dm.sendError(err)
return true
default:
return false
}
}