golang框架的代码生成器如何在大型项目中应用

// grpc.vega

// Command Definitions
schema "user"
  service "UserService" {
    rpc "CreateUser" (CreateUserRequest) returns (User)
  }
endmodule

// Message Definitions
message "CreateUserRequest" {
  field "username" string (1)
  field "password" string (2)
  field "metadata" bytes (3)
}

message "User" {
  field "id" string (1)
  field "username" string (2)
}

// proto/user/user.pb.go (generated by Vega)

package user

import (
    "context"
    "errors"
    "fmt"

    "github.com/golang/protobuf/ptypes"
    "github.com/golang/protobuf/ptypes/timestamp"

    "google.golang.org/genproto/googleapis/type/date"
    "google.golang.org/genproto/googleapis/type/latlng"
    "google.golang.org/genproto/protobuf/field_mask"
)

// UserService represents service definitions
type UserServiceClient interface {
    CreateUser(ctx context.Context, in *CreateUserRequest, opts ...gax.CallOption) (*User, error)
}

type userServiceClient struct {
    c *UserServiceClient
}

// NewUserServiceClient creates a new user service client based on gRPC.
func NewUserServiceClient(ctx context.Context, opts ...option.ClientOption) (*UserServiceClient, error) {
    conn, err := connect(ctx, opts...)
    if err != nil {
        return nil, err
    }
    c := &UserServiceClient{
        c: &UserServiceClient{
            Client: google.NewUserServiceClient(conn),
        },
    }
    return c, nil
}