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delete.go
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delete.go
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package pipeline
import (
"encoding/json"
"fmt"
)
// Deletes fields and tags from data points.
//
// Example:
// stream
// |delete()
// .field('value')
// .tag('host')
//
// The above example will remove the field `value` and the tag `host`, from each point.
//
// Available Statistics:
//
// * fields_deleted -- number of fields that were deleted. Only counts if the field already existed.
// * tags_deleted -- number of tags that were deleted. Only counts if the tag already existed.
//
type DeleteNode struct {
chainnode `json:"-"`
// Set of fields to delete
// tick:ignore
Fields []string `tick:"Field" json:"fields"`
// Set of tags to delete
// tick:ignore
Tags []string `tick:"Tag" json:"tags"`
}
func newDeleteNode(e EdgeType) *DeleteNode {
n := &DeleteNode{
chainnode: newBasicChainNode("delete", e, e),
}
return n
}
// MarshalJSON converts DeleteNode to JSON
// tick:ignore
func (n *DeleteNode) MarshalJSON() ([]byte, error) {
type Alias DeleteNode
var raw = &struct {
TypeOf
*Alias
}{
TypeOf: TypeOf{
Type: "delete",
ID: n.ID(),
},
Alias: (*Alias)(n),
}
return json.Marshal(raw)
}
// UnmarshalJSON converts JSON to an DeleteNode
// tick:ignore
func (n *DeleteNode) UnmarshalJSON(data []byte) error {
type Alias DeleteNode
var raw = &struct {
TypeOf
*Alias
}{
Alias: (*Alias)(n),
}
err := json.Unmarshal(data, raw)
if err != nil {
return err
}
if raw.Type != "delete" {
return fmt.Errorf("error unmarshaling node %d of type %s as DeleteNode", raw.ID, raw.Type)
}
n.setID(raw.ID)
return nil
}
// Delete a field.
// tick:property
func (n *DeleteNode) Field(name string) *DeleteNode {
n.Fields = append(n.Fields, name)
return n
}
// Delete a tag.
// tick:property
func (n *DeleteNode) Tag(name string) *DeleteNode {
n.Tags = append(n.Tags, name)
return n
}