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resolver.go
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resolver.go
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// Copyright 2018 Istio Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package yaml
import (
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
descriptor2 "istio.io/istio/mixer/pkg/protobuf/descriptor"
)
// Resolver type is used for finding and resolving references inside proto descriptors.
type Resolver interface {
ResolveMessage(name string) *descriptor.DescriptorProto
ResolveEnum(name string) *descriptor.EnumDescriptorProto
}
type resolver struct {
messages map[string]*descriptor.DescriptorProto
enums map[string]*descriptor.EnumDescriptorProto
}
// NewResolver creates a new resolver
func NewResolver(fds *descriptor.FileDescriptorSet) Resolver {
parser := descriptor2.CreateFileDescriptorSetParser(fds, nil, "")
return &resolver{enums: parser.Enums(), messages: parser.Messages()}
}
// ResolveMessage finds a given fully-qualified message name. The name starts with
// a dot followed by package name and the name of the element. Example: `.foo.mymessage.mysubmessage`
func (r *resolver) ResolveMessage(name string) *descriptor.DescriptorProto {
return r.messages[name]
}
// ResolveEnum finds a given fully-qualified enum name. The name starts with
// a dot followed by package name and the name of the element. Example: `.foo.mymessage.myenum`
func (r *resolver) ResolveEnum(name string) *descriptor.EnumDescriptorProto {
return r.enums[name]
}
// FindFieldByName finds a field descriptor by its name.
func FindFieldByName(descriptor *descriptor.DescriptorProto, name string) *descriptor.FieldDescriptorProto {
for _, f := range descriptor.Field {
if f.GetJsonName() == name || f.GetName() == name {
return f
}
}
return nil
}