consul/agent/grpc-external/querymeta.go

81 lines
1.8 KiB
Go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1
package external
import (
"fmt"
"reflect"
"github.com/mitchellh/mapstructure"
"google.golang.org/grpc/metadata"
"github.com/hashicorp/consul/agent/structs"
)
func StringToQueryBackendDecodeHookFunc(f reflect.Type, t reflect.Type, data any) (any, error) {
if f.Kind() != reflect.String {
return data, nil
}
if t != reflect.TypeOf(structs.QueryBackend(0)) {
return data, nil
}
name, ok := data.(string)
if !ok {
return data, fmt.Errorf("could not parse query backend as string")
}
return structs.QueryBackendFromString(name), nil
}
// QueryMetaFromGRPCMeta returns a structs.QueryMeta struct parsed from the metadata.MD,
// such as from a gRPC header or trailer.
func QueryMetaFromGRPCMeta(md metadata.MD) (structs.QueryMeta, error) {
var queryMeta structs.QueryMeta
m := map[string]string{}
for k, v := range md {
m[k] = v[0]
}
decodeHooks := mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
StringToQueryBackendDecodeHookFunc,
)
config := &mapstructure.DecoderConfig{
Metadata: nil,
Result: &queryMeta,
WeaklyTypedInput: true,
DecodeHook: decodeHooks,
}
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return queryMeta, err
}
err = decoder.Decode(m)
if err != nil {
return queryMeta, err
}
return queryMeta, nil
}
// GRPCMetadataFromQueryMeta returns a metadata struct with fields from the structs.QueryMeta attached.
// The return value is suitable for attaching to a gRPC header/trailer.
func GRPCMetadataFromQueryMeta(queryMeta structs.QueryMeta) (metadata.MD, error) {
md := metadata.MD{}
m := map[string]any{}
err := mapstructure.Decode(queryMeta, &m)
if err != nil {
return nil, err
}
for k, v := range m {
md.Set(k, fmt.Sprintf("%v", v))
}
return md, nil
}