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Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
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Summary of Changes
Hello @oilbeater, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request addresses a bug related to how Logical Switch ACLs are updated in OVN. The primary change ensures that the process of removing existing ACLs and applying new ones is atomic, meaning both operations succeed or fail together. This prevents transient states where a logical switch might temporarily be without necessary network policies during an update, enhancing the reliability of network security configurations.
Highlights
- Atomic ACL Updates: The
UpdateLogicalSwitchACLfunction has been refactored to perform the deletion of old ACLs and the creation of new ACLs within a single OVN transaction. This ensures atomicity, preventing a temporary state where no ACLs are present between the delete and add operations, which could lead to policy enforcement gaps. - Conditional ACL Deletion: The initial unconditional
DeleteAclscall at the beginning ofUpdateLogicalSwitchACL(lines 453-456) has been removed. Now, ACLs are only explicitly deleted if thesubnetAclslist is empty (lines 454-457), signifying that all ACLs for the logical switch should be removed.
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Code Review
The pull request significantly improves the UpdateLogicalSwitchACL function by making the ACL deletion and creation process atomic. By consolidating these operations into a single OVSDB transaction, the change enhances data consistency and robustness, mitigating potential race conditions that could arise from separate delete and create operations. This is a valuable improvement for the reliability of ACL management. The changes align with common Go best practices for error handling and code clarity.
| delOps, err := c.DeleteAclsOps(lsName, logicalSwitchKey, "", map[string]string{"subnet": lsName}) | ||
| if err != nil { | ||
| klog.Error(err) | ||
| return err | ||
| } | ||
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| addOps, err := c.CreateAclsOps(lsName, logicalSwitchKey, acls...) | ||
| if err != nil { | ||
| klog.Error(err) | ||
| return err | ||
| } | ||
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| if err := c.Transact("acls-update", append(delOps, addOps...)); err != nil { | ||
| klog.Error(err) | ||
| return fmt.Errorf("add acls to logical switch %s: %w", lsName, err) | ||
| return fmt.Errorf("update acls for logical switch %s: %w", lsName, err) | ||
| } |
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This is the core improvement of this pull request. By combining the deletion and creation of ACLs into a single Transact call, you ensure atomicity. This prevents potential inconsistencies or race conditions that could occur if the operations were performed in separate transactions, especially in a concurrent environment. This makes the ACL update operation much more robust and reliable.
| if err := c.DeleteAcls(lsName, logicalSwitchKey, "", map[string]string{"subnet": lsName}); err != nil { | ||
| klog.Error(err) | ||
| return fmt.Errorf("delete subnet acls from %s: %w", lsName, err) | ||
| } |
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This change correctly refactors the ACL deletion logic. Previously, DeleteAcls was called unconditionally, which could lead to unnecessary operations if new ACLs were about to be created anyway. By moving the deletion into the if len(subnetAcls) == 0 block, you ensure that old ACLs are only explicitly deleted when no new ACLs are being added. If new ACLs are present, the deletion will be handled as part of the atomic transaction later in the function.
Pull Request Test Coverage Report for Build 15870601412Details
💛 - Coveralls |
Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
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Pull Request
What type of this PR
Examples of user facing changes:
Which issue(s) this PR fixes
Fixes #5374