Prevent package import for 3rd parties

Question

For my current project I am implementing a code (separate package) to be part of binary which (this package) can also be imported by other projects (binaries) as if it was a library. The reason why such package is not a part of shared library is that it's functionality is tied tightly with the mentioned project.

The problem is this package provides an interface with two implementations

• one with direct access to underlying database which should only be used within the current project
• another with HTTP request to be imported in other projects (HTTP requests going to current project)

My question is: is there a mechanism in Go how to prevent certain part of package or it's sub-package from being imported by another projects?

It's mostly just an aesthetic issue since the DB-accessing implementation won't work at all (throwing errors) when used outside of current project.

Answer 1

Yes, you can use an internal directory.

Code in or below a directory named "internal" is importable only by code in the directory tree rooted at the parent of "internal".