mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-18 19:44:06 -08:00
83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
package runtime
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import (
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"encoding/json"
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"io"
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"strings"
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descriptor2 "github.com/golang/protobuf/descriptor"
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"github.com/golang/protobuf/protoc-gen-go/descriptor"
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"google.golang.org/genproto/protobuf/field_mask"
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)
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func translateName(name string, md *descriptor.DescriptorProto) (string, *descriptor.DescriptorProto) {
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// TODO - should really gate this with a test that the marshaller has used json names
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if md != nil {
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for _, f := range md.Field {
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if f.JsonName != nil && f.Name != nil && *f.JsonName == name {
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var subType *descriptor.DescriptorProto
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// If the field has a TypeName then we retrieve the nested type for translating the embedded message names.
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if f.TypeName != nil {
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typeSplit := strings.Split(*f.TypeName, ".")
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typeName := typeSplit[len(typeSplit)-1]
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for _, t := range md.NestedType {
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if typeName == *t.Name {
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subType = t
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}
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}
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}
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return *f.Name, subType
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}
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}
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}
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return name, nil
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}
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// FieldMaskFromRequestBody creates a FieldMask printing all complete paths from the JSON body.
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func FieldMaskFromRequestBody(r io.Reader, md *descriptor.DescriptorProto) (*field_mask.FieldMask, error) {
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fm := &field_mask.FieldMask{}
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var root interface{}
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if err := json.NewDecoder(r).Decode(&root); err != nil {
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if err == io.EOF {
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return fm, nil
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}
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return nil, err
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}
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queue := []fieldMaskPathItem{{node: root, md: md}}
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for len(queue) > 0 {
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// dequeue an item
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item := queue[0]
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queue = queue[1:]
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if m, ok := item.node.(map[string]interface{}); ok {
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// if the item is an object, then enqueue all of its children
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for k, v := range m {
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protoName, subMd := translateName(k, item.md)
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if subMsg, ok := v.(descriptor2.Message); ok {
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_, subMd = descriptor2.ForMessage(subMsg)
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}
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queue = append(queue, fieldMaskPathItem{path: append(item.path, protoName), node: v, md: subMd})
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}
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} else if len(item.path) > 0 {
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// otherwise, it's a leaf node so print its path
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fm.Paths = append(fm.Paths, strings.Join(item.path, "."))
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}
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}
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return fm, nil
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}
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// fieldMaskPathItem stores a in-progress deconstruction of a path for a fieldmask
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type fieldMaskPathItem struct {
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// the list of prior fields leading up to node
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path []string
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// a generic decoded json object the current item to inspect for further path extraction
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node interface{}
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// descriptor for parent message
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md *descriptor.DescriptorProto
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}
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