mirror of
https://github.com/Luzifer/repo-template.git
synced 2024-12-23 12:41:19 +00:00
93 lines
3.3 KiB
Go
93 lines
3.3 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
|
|
//
|
|
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// https://github.com/golang/protobuf
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived from
|
|
// this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// Package descriptor provides functions for obtaining protocol buffer
|
|
// descriptors for generated Go types.
|
|
//
|
|
// These functions cannot go in package proto because they depend on the
|
|
// generated protobuf descriptor messages, which themselves depend on proto.
|
|
package descriptor
|
|
|
|
import (
|
|
"bytes"
|
|
"compress/gzip"
|
|
"fmt"
|
|
"io/ioutil"
|
|
|
|
"github.com/golang/protobuf/proto"
|
|
protobuf "github.com/golang/protobuf/protoc-gen-go/descriptor"
|
|
)
|
|
|
|
// extractFile extracts a FileDescriptorProto from a gzip'd buffer.
|
|
func extractFile(gz []byte) (*protobuf.FileDescriptorProto, error) {
|
|
r, err := gzip.NewReader(bytes.NewReader(gz))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open gzip reader: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
b, err := ioutil.ReadAll(r)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to uncompress descriptor: %v", err)
|
|
}
|
|
|
|
fd := new(protobuf.FileDescriptorProto)
|
|
if err := proto.Unmarshal(b, fd); err != nil {
|
|
return nil, fmt.Errorf("malformed FileDescriptorProto: %v", err)
|
|
}
|
|
|
|
return fd, nil
|
|
}
|
|
|
|
// Message is a proto.Message with a method to return its descriptor.
|
|
//
|
|
// Message types generated by the protocol compiler always satisfy
|
|
// the Message interface.
|
|
type Message interface {
|
|
proto.Message
|
|
Descriptor() ([]byte, []int)
|
|
}
|
|
|
|
// ForMessage returns a FileDescriptorProto and a DescriptorProto from within it
|
|
// describing the given message.
|
|
func ForMessage(msg Message) (fd *protobuf.FileDescriptorProto, md *protobuf.DescriptorProto) {
|
|
gz, path := msg.Descriptor()
|
|
fd, err := extractFile(gz)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("invalid FileDescriptorProto for %T: %v", msg, err))
|
|
}
|
|
|
|
md = fd.MessageType[path[0]]
|
|
for _, i := range path[1:] {
|
|
md = md.NestedType[i]
|
|
}
|
|
return fd, md
|
|
}
|