Why Can't I Import the `internal` Package in My Go Application?

Internal Package Import Restriction: "Use of internal package not allowed"

When developing Go applications, it's possible to encounter the error "use of internal package not allowed". This error arises when attempting to import internal packages, which are packages located within directories containing the "internal" subfolder.

Internal packages serve as private or protected modules, designed to restrict access from external packages. This ensures that complex packages can be organized into smaller, encapsulated modules while maintaining internal structure and data privacy.

In this specific instance, the error message in the provided Git repository (https://github.com/hyperledger/fabric/tree/master) indicates that the package "github.com/hyperledger/fabric/internal/pkg/identity" cannot be imported from the external package "consensus.go". This is because the "internal" folder prohibits external access to its packages.

To address this issue, it's crucial to understand the following points:

• Internal packages can only be imported by packages rooted at the parent of the internal folder.
• External packages cannot directly access internal packages.
• Treating internal packages as private or inaccessible from the outside is essential.

If you need to access functionality defined in an internal package, you must follow these steps:

1. Remove the "internal" folder from the directory containing the internal package.
2. Adjust the import paths accordingly to reflect the new package structure.

By understanding the nature of internal packages and adhering to the compiler restrictions, you can successfully resolve the "use of internal package not allowed" error and maintain the integrity of your Go applications.

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