diff options
Diffstat (limited to 'vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.go')
-rw-r--r-- | vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.go | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.go b/vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.go new file mode 100644 index 000000000..a85bf1984 --- /dev/null +++ b/vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.go @@ -0,0 +1,118 @@ +// 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/gogo/protobuf/proto" +) + +// extractFile extracts a FileDescriptorProto from a gzip'd buffer. +func extractFile(gz []byte) (*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(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 *FileDescriptorProto, md *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 +} + +// Is this field a scalar numeric type? +func (field *FieldDescriptorProto) IsScalar() bool { + if field.Type == nil { + return false + } + switch *field.Type { + case FieldDescriptorProto_TYPE_DOUBLE, + FieldDescriptorProto_TYPE_FLOAT, + FieldDescriptorProto_TYPE_INT64, + FieldDescriptorProto_TYPE_UINT64, + FieldDescriptorProto_TYPE_INT32, + FieldDescriptorProto_TYPE_FIXED64, + FieldDescriptorProto_TYPE_FIXED32, + FieldDescriptorProto_TYPE_BOOL, + FieldDescriptorProto_TYPE_UINT32, + FieldDescriptorProto_TYPE_ENUM, + FieldDescriptorProto_TYPE_SFIXED32, + FieldDescriptorProto_TYPE_SFIXED64, + FieldDescriptorProto_TYPE_SINT32, + FieldDescriptorProto_TYPE_SINT64: + return true + default: + return false + } +} |