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data.go
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data.go
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package data
import (
"fmt"
"github.com/antonmedv/expr"
wfv1 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
)
func ProcessData(data *wfv1.Data, processor wfv1.DataSourceProcessor) (interface{}, error) {
sourcedData, err := processSource(data.Source, processor)
if err != nil {
return nil, fmt.Errorf("unable to process data source: %w", err)
}
transformedData, err := processTransformation(sourcedData, &data.Transformation)
if err != nil {
return nil, fmt.Errorf("unable to process data transformation: %w", err)
}
return transformedData, nil
}
func processSource(source wfv1.DataSource, processor wfv1.DataSourceProcessor) (interface{}, error) {
var data interface{}
var err error
switch {
case source.ArtifactPaths != nil:
data, err = processor.ProcessArtifactPaths(source.ArtifactPaths)
if err != nil {
return nil, fmt.Errorf("unable to source artifact paths: %w", err)
}
default:
return nil, fmt.Errorf("no valid source is used for data template")
}
return data, nil
}
func processTransformation(data interface{}, transformation *wfv1.Transformation) (interface{}, error) {
if transformation == nil {
return data, nil
}
var err error
for i, step := range *transformation {
switch {
case step.Expression != "":
data, err = processExpression(step.Expression, data)
}
if err != nil {
return nil, fmt.Errorf("error processing data step %d: %w", i, err)
}
}
return data, nil
}
func processExpression(expression string, data interface{}) (interface{}, error) {
return expr.Eval(expression, map[string]interface{}{"data": data})
}