/
pubsub.go
54 lines (50 loc) · 1.71 KB
/
pubsub.go
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// Copyright 2024 Buf Technologies, Inc.
//
// 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 pubsub
import (
"github.com/bufbuild/protoschema-plugins/internal/protoschema/normalize"
"github.com/jhump/protoreflect/desc"
"github.com/jhump/protoreflect/desc/protoprint"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/descriptorpb"
)
const (
// FileExtension is the file extension for the PubSub schema files.
FileExtension = "pubsub.proto"
)
// Generate generates a PubSub schema in the form of a single self-contained messaged normalized to
// proto2 for the given message descriptor.
func Generate(input protoreflect.MessageDescriptor) (string, error) {
normalizer := normalize.NewNormalizer()
rootMsg, err := normalizer.Normalize(input)
if err != nil {
return "", err
}
file := &descriptorpb.FileDescriptorProto{
Name: proto.String(FileExtension),
Syntax: proto.String("proto2"),
MessageType: []*descriptorpb.DescriptorProto{
rootMsg,
},
}
fileDesc, err := desc.CreateFileDescriptor(file)
if err != nil {
return "", err
}
printer := &protoprint.Printer{
Compact: true,
}
return printer.PrintProtoToString(fileDesc)
}