Add AccessManagerEnumerable

[ernestognw]

Testing how an AccessManagerEnumerable would look like

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openzeppelin-solidity	Minor

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Walkthrough

Introduces a new abstract contract AccessManagerEnumerable that extends the AccessManager contract. The contract tracks role members by maintaining an EnumerableSet for each role. It overrides the _grantRole and _revokeRole internal methods to manage role member tracking. Two new public view functions are added: getRoleMembers to retrieve a paginated slice of addresses for a given role, and getRoleMemberCount to return the total member count for a role.

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Check name	Status	Explanation
Title check	✅ Passed	The title 'Add AccessManagerEnumerable' clearly and concisely summarizes the main change: introduction of a new contract extension.
Description check	✅ Passed	The description explains the purpose of the PR (testing a prototype) and references the PR checklist with pending items, which is related to the changeset.

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Actionable comments posted: 3

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• contracts/access/manager/extensions/AccessManagerEnumerable.sol (1 hunks)

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🧠 Learnings (1)

📓 Common learnings

Learnt from: ernestognw
Repo: OpenZeppelin/openzeppelin-contracts PR: 5904
File: contracts/crosschain/README.adoc:1-1
Timestamp: 2025-08-28T15:48:30.716Z
Learning: ernestognw prefers "Cross chain" without hyphenation rather than "Cross-chain" in documentation titles.

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🔇 Additional comments (2)

contracts/access/manager/extensions/AccessManagerEnumerable.sol (2)

25-31: The implementation is correct—all role revocation paths call _revokeRole.

Verification confirms:

• revokeRole() → calls _revokeRole() ✓
• renounceRole() → calls _revokeRole() ✓
• cancel() → handles scheduled operation cancellation, not role revocation
• No role expiration mechanism exists in the codebase
• The enumerable override properly guards set removal with the return value from super._revokeRole()

No desynchronization risk exists.

Likely an incorrect or invalid review comment.

---

12-23: Clarify intent: should enumerable set track scheduled or only effective role grants?

The concern is partially valid. Analysis confirms:

• getRoleMembers() includes accounts with scheduled grants (where since > now) that are not yet effective
• hasRole() correctly returns false for these same accounts until the grant becomes effective
• _revokeRole() is properly synchronized and removes accounts from the enumerable set

This creates an API inconsistency: getRoleMembers() and hasRole() disagree on whether an account "has" a role during the grantDelay window. This appears intentional but should be clarified:

• Is getRoleMembers() meant to enumerate all grant holders (scheduled or effective)?
• Should the docs explicitly explain this distinction?
• Or should the enumerable set only track effective members?

[ernestognw]

Related to #6091