[fix] Avoided duplicate IP allocation in subnet division #1464 - #1466
[fix] Avoided duplicate IP allocation in subnet division #1464#1466nemesifier wants to merge 3 commits into
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Skipped child prefixes whose addresses are allocated in the related subnet hierarchy. Fixes #1464.
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📝 WalkthroughWalkthroughThe subnet division rule now checks IP allocations across related subnets and skips conflicting candidates. It centralizes address index selection for Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to Although the change prevents duplicate allocations in sequential subnet division, concurrent provisioning can still assign the same address range to multiple consumers. This can cause conflicting network assignments, so the PR is not ready to merge without addressing or explicitly accepting this race. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Ui Changes, Regression Test, DocsExplanation PASS. The pull request changes subnet allocation behavior and adds regression coverage in Full details: Description checkExplanation The description is mostly complete. It includes the issue reference, change summary, test updates, documentation updates, and a screenshot status. The checklist uses a browser-testing item instead of the template's manual-testing item, so manual testing is not explicitly confirmed.
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Code Review SummaryStatus: No Issues Found | Recommendation: Merge Files Reviewed (1 file)
Previous Review Summary (commit 227b7dc)Current summary above is authoritative. Previous snapshots are kept for context only. Previous review (commit 227b7dc)Status: No Issues Found | Recommendation: Merge Files Reviewed (3 files)
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Inline comments:
In `@openwisp_controller/subnet_division/rule_types/base.py`:
- Around line 225-229: Make create_subnets_ips() atomic per master_subnet by
enclosing its get_max_subnet(), allocated_ips scan, candidate selection, and
create_subnets() operations in a transaction with per-master_subnet
serialization. Ensure concurrent workers cannot persist duplicate hierarchical
allocations, and add a regression test that exercises concurrent calls for the
same master subnet.
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openwisp_controller/config/tests/test_selenium.pyopenwisp_controller/subnet_division/rule_types/base.pyopenwisp_controller/subnet_division/tests/test_models.py
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- GitHub Check: Python==3.13 | django~=5.2.0
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📓 Path-based instructions (4)
Ensure tests cover relevant success, error, boundary, and unusual
⚙️ CodeRabbit configuration file
Files:
openwisp_controller/config/tests/test_selenium.pyopenwisp_controller/subnet_division/tests/test_models.py
- Flag potential security vulnerabilities
⚙️ CodeRabbit configuration file
Files:
openwisp_controller/config/tests/test_selenium.pyopenwisp_controller/subnet_division/tests/test_models.pyopenwisp_controller/subnet_division/rule_types/base.py
Place imports at the top of the file. Only defer imports when necessary (for example, Django model imports inside functions or methods where the app registry is not yet ready).
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Files:
openwisp_controller/config/tests/test_selenium.pyopenwisp_controller/subnet_division/tests/test_models.pyopenwisp_controller/subnet_division/rule_types/base.py
Keep tests quiet on success. When code under test writes to stdout or stderr, use `capture_stdout`, `capture_stderr`, or `capture_any_output` from `openwisp_utils.tests` and assert the expected output. Do not leave unasserted output, logs, ...
📄 CodeRabbit inference engine (AGENTS.md)
Files:
openwisp_controller/config/tests/test_selenium.pyopenwisp_controller/subnet_division/tests/test_models.py
🧠 Learnings (2)
📚 Learning: 2026-02-17T19:13:10.088Z
Learnt from: nemesifier
Repo: openwisp/openwisp-controller PR: 1175
File: openwisp_controller/config/whois/commands.py:0-0
Timestamp: 2026-02-17T19:13:10.088Z
Learning: In reviews for the openwisp/openwisp-controller repository, do not propose changes based on Ruff warnings. The project does not use Ruff as its linter; ignore Ruff-related suggestions and follow the repository’s established linting and configuration rules. This guidance applies to all Python files under the openwisp_controller directory.
Applied to files:
openwisp_controller/subnet_division/rule_types/base.py
📚 Learning: 2026-01-15T15:07:17.354Z
Learnt from: DragnEmperor
Repo: openwisp/openwisp-controller PR: 1175
File: openwisp_controller/geo/estimated_location/tests/tests.py:172-175
Timestamp: 2026-01-15T15:07:17.354Z
Learning: In this repository, flake8 enforces E501 (line too long) via setup.cfg (max-line-length = 88) while ruff ignores E501 via ruff.toml. Therefore, use '# noqa: E501' on lines that intentionally exceed 88 characters to satisfy flake8 without affecting ruff checks. This applies to Python files across the project (any .py) and is relevant for tests as well. Use sparingly and only where breaking lines is not feasible without hurting readability or functionality.
Applied to files:
openwisp_controller/subnet_division/rule_types/base.py
🔇 Additional comments (5)
openwisp_controller/config/tests/test_selenium.py (1)
75-77: LGTM!openwisp_controller/subnet_division/rule_types/base.py (3)
233-234: LGTM!Also applies to: 253-262
286-295: LGTM!
302-313: LGTM!openwisp_controller/subnet_division/tests/test_models.py (1)
298-300: LGTM!Also applies to: 302-314, 335-336, 348-350
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The CI is failing due to transient infrastructure issues (not related to your code). I have restarted the failed jobs automatically (1/3). |
Explained how subnet division skips conflicting child prefixes. Fixes #1464.
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✅ Action performedComments resolved and changes approved. |
Checklist
Reference to Existing Issue
Closes #1464.
Description of Changes
Prevents subnet division from selecting child prefixes whose provisioned addresses are already assigned in the master subnet hierarchy. Updates the IPv4 and IPv6 host-prefix regressions and adds coverage for multiple parent allocations.
Extends the Selenium wait for the dynamically created template field so the test waits for widget initialization instead of assuming the default two-second timeout.
Screenshot
N/A