parse

type Field struct {
	Name      string
	FieldType string
	Comment   string
}

type PbService struct {
	Name      string           // Greeter
	LowerName string           // greeter first character to lower
	ProtoName string           // proto file name greeter.proto
	Methods   []*ServiceMethod // service methods
}

type ServiceMethod struct {
	MethodName    string   // e.g. Create
	Request       string   // e.g. CreateRequest
	RequestFields []*Field // request fields
	Reply         string   // e.g. CreateReply
	ReplyFields   []*Field
	Comment       string // e.g. Create a record

	ServiceName      string // Greeter
	LowerServiceName string // greeter first character to lower
}