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

	ImportPkgMap map[string]string // e.g. [userV1]:[userV1 "user/api/user/v1"]

	ProtoFileDir string // e.g. api/user/v1
	ProtoPkgName string // e.g. userV1
	ModuleName   string
}

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
	InvokeType    int    // 0:unary, 1: client-side streaming, 2: server-side streaming, 3: bidirectional streaming

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

	RequestImportPkgName string // e.g. userV1
	ReplyImportPkgName   string // e.g. userV1
	ProtoPkgName         string // e.g. userV1
}