Why Am I Getting the 'Use of Internal Package Not Allowed' Error in Go?

Understanding the "Use of Internal Package Not Allowed" Error

When working on a repository like Hyperledger Fabric, encountering the error "use of internal package not allowed" can be puzzling. This error indicates an attempt to import an internal package (a package within a folder named internal) from an external package.

What Are Internal Packages?

Internal packages are designed to provide hierarchical organization and prevent external access to non-public components within a project. They can only be accessed by packages located directly above them in the hierarchy. This concept promotes encapsulation and prevents accidental exposure of internals.

Resolving the Error

To resolve this error, it is essential to understand the import rules for internal packages:

• Internal package naming: Internal packages must be named with internal/ as a subfolder.
• Import restrictions: Internal packages can only be imported by packages located in the same directory or above.

In the case of the error you mentioned, the package github.com/hyperledger/fabric/internal/pkg/identity is an internal package that cannot be imported directly from any package outside the internal/pkg/ directory.

Additional Notes:

• Internal packages are a compiler-enforced restriction and cannot be bypassed.
• If you need to expose internal functionality, you can remove the internal folder name from the package path and adjust the imports accordingly.
• Consider using package grouping as an alternative to internal packages when organizing your project structure.

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