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filter.go
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/
filter.go
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package kube_events_manager
import (
"context"
"encoding/json"
"fmt"
"reflect"
"runtime"
"runtime/trace"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"github.com/flant/shell-operator/pkg/app"
"github.com/flant/shell-operator/pkg/jq"
. "github.com/flant/shell-operator/pkg/kube_events_manager/types"
utils_checksum "github.com/flant/shell-operator/pkg/utils/checksum"
)
// ApplyFilter filters object json representation with jq expression, calculate checksum
// over result and return ObjectAndFilterResult. If jqFilter is empty, no filter
// is required and checksum is calculated over full json representation of the object.
func ApplyFilter(jqFilter string, filterFn func(obj *unstructured.Unstructured) (result interface{}, err error), obj *unstructured.Unstructured) (*ObjectAndFilterResult, error) {
defer trace.StartRegion(context.Background(), "ApplyJqFilter").End()
res := &ObjectAndFilterResult{
Object: obj,
}
res.Metadata.JqFilter = jqFilter
res.Metadata.ResourceId = ResourceId(obj)
// If filterFn is passed, run it and return result.
if filterFn != nil {
filteredObj, err := filterFn(obj)
if err != nil {
return nil, fmt.Errorf("filterFn (%s) contains an error: %v", runtime.FuncForPC(reflect.ValueOf(filterFn).Pointer()).Name(), err)
}
filteredBytes, err := json.Marshal(filteredObj)
if err != nil {
return nil, err
}
res.FilterResult = filteredObj
res.Metadata.Checksum = utils_checksum.CalculateChecksum(string(filteredBytes))
return res, nil
}
// Render obj to JSON text to apply jq filter.
data, err := json.Marshal(obj)
if err != nil {
return nil, err
}
if jqFilter == "" {
res.Metadata.Checksum = utils_checksum.CalculateChecksum(string(data))
} else {
var err error
var filtered string
filtered, err = jq.ApplyJqFilter(jqFilter, data, app.JqLibraryPath)
if err != nil {
return nil, fmt.Errorf("jqFilter: %v", err)
}
res.FilterResult = filtered
res.Metadata.Checksum = utils_checksum.CalculateChecksum(filtered)
}
return res, nil
}