fix(lock): implement Redlock single-instance pattern in LockManagerService#537
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fix(lock): implement Redlock single-instance pattern in LockManagerService#537
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📝 WalkthroughWalkthroughThe PR adds an atomic compare-and-delete cache method to the ICacheService, implements it in Redis via a Lua eval, updates Redis conditional set usages, and refactors LockManagerService to use per-call random ownership tokens, exponential backoff for acquisition, and ownership-aware releases; tests validate the ownership behavior. ChangesOwnership-Based Distributed Locking
Sequence DiagramsequenceDiagram
participant Client
participant LMS as LockManagerService
participant RCS as RedisCacheService
participant Redis
rect rgba(100, 150, 200, 0.5)
Note over Client,Redis: Lock Acquisition (Success Path)
Client->>LMS: acquireLock(name, lifetime)
LMS->>LMS: Generate token = random_bytes(16)
loop Exponential Backoff Retry Loop
LMS->>RCS: addSingleValue(name, token, lifetime)
RCS->>Redis: SET name token NX EX lifetime
Redis-->>RCS: OK (or nil)
alt First attempt succeeds
RCS-->>LMS: true
LMS->>LMS: Store $tokens[name] = token
LMS-->>Client: Acquisition complete
else Retry needed
RCS-->>LMS: false
LMS->>LMS: Sleep with exponential backoff
end
end
end
rect rgba(200, 150, 100, 0.5)
Note over Client,Redis: Lock Release (Ownership Check)
Client->>LMS: releaseLock(name)
LMS->>LMS: Check $tokens[name] exists?
alt Owned by this process
LMS->>RCS: deleteIfValueMatches(name, token)
RCS->>Redis: EVAL Lua script (compare & delete)
Redis->>Redis: GET name == token?
alt Values match
Redis->>Redis: DEL name
Redis-->>RCS: 1 (deleted)
else Mismatch (lock stolen)
Redis-->>RCS: 0 (not deleted)
end
RCS-->>LMS: true/false
LMS->>LMS: Unset $tokens[name]
LMS-->>Client: Released
else Not owned
LMS-->>Client: Return (no-op)
end
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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📘 OpenAPI / Swagger preview ➡️ https://OpenStackweb.github.io/summit-api/openapi/pr-537/ This page is automatically updated on each push to this PR. |
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🧹 Nitpick comments (1)
app/Services/Utils/LockManagerService.php (1)
62-70: 💤 Low valueMinor: Unnecessary sleep before throwing on final retry.
When
attempt >= MaxRetries - 1, the code still executesusleepbefore throwing. This adds ~400ms of unnecessary delay on the final failed attempt.Consider moving the retry check before the sleep:
Suggested reorder
- $wait_interval = (int)(self::BackOffBaseInterval * (self::BackOffMultiplier ** $attempt)); - Log::debug(sprintf("LockManagerService::acquireLock name %s retrying in %s µs (attempt %s)", $name, $wait_interval, $attempt)); - usleep($wait_interval); if ($attempt >= (self::MaxRetries - 1)) { Log::error(sprintf("LockManagerService::acquireLock name %s lifetime %s ERROR MAX RETRIES attempt %s", $name, $lifetime, $attempt)); throw new UnacquiredLockException(sprintf("lock name %s", $name)); } + $wait_interval = (int)(self::BackOffBaseInterval * (self::BackOffMultiplier ** $attempt)); + Log::debug(sprintf("LockManagerService::acquireLock name %s retrying in %s µs (attempt %s)", $name, $wait_interval, $attempt)); + usleep($wait_interval); ++$attempt;🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@app/Services/Utils/LockManagerService.php` around lines 62 - 70, The loop in LockManagerService::acquireLock sleeps (usleep) even when $attempt >= (self::MaxRetries - 1), causing an unnecessary delay before throwing UnacquiredLockException; reorder the logic so the check for final retry (if $attempt >= (self::MaxRetries - 1)) occurs before calling usleep and before incrementing $attempt, log and throw immediately on final attempt, otherwise perform the usleep, increment $attempt and continue the loop to preserve backoff behavior.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Nitpick comments:
In `@app/Services/Utils/LockManagerService.php`:
- Around line 62-70: The loop in LockManagerService::acquireLock sleeps (usleep)
even when $attempt >= (self::MaxRetries - 1), causing an unnecessary delay
before throwing UnacquiredLockException; reorder the logic so the check for
final retry (if $attempt >= (self::MaxRetries - 1)) occurs before calling usleep
and before incrementing $attempt, log and throw immediately on final attempt,
otherwise perform the usleep, increment $attempt and continue the loop to
preserve backoff behavior.
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: a4fb76b4-55ed-4ec3-a248-fdf0d070fc95
📒 Files selected for processing (4)
Libs/Utils/ICacheService.phpapp/Services/Utils/LockManagerService.phpapp/Services/Utils/RedisCacheService.phptests/Unit/Services/LockManagerServiceOwnershipTest.php
…rvice Signed-off-by: romanetar <roman_ag@hotmail.com>
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📘 OpenAPI / Swagger preview ➡️ https://OpenStackweb.github.io/summit-api/openapi/pr-537/ This page is automatically updated on each push to this PR. |
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🧹 Nitpick comments (1)
tests/Unit/Services/LockManagerServiceOwnershipTest.php (1)
139-144: 💤 Low valueConsider asserting the token is non-empty for stronger ownership guarantee coverage.
Mockery::type('string')accepts any string including''. A complementary assertion withMockery::on(fn($v) => strlen($v) >= 16)(or similar) would confirm the service is actually generating a meaningful random token rather than an empty or trivial value.♻️ Tighter token constraint
- ->with('test.lock', Mockery::type('string'), 3600) + ->with('test.lock', Mockery::on(fn(string $v) => strlen($v) >= 16), 3600)🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@tests/Unit/Services/LockManagerServiceOwnershipTest.php` around lines 139 - 144, Replace the loose Mockery::type('string') expectation in LockManagerServiceOwnershipTest (the mock of ICacheService used with addSingleValue) with a stricter constraint that asserts the token is non-empty/strong (e.g. Mockery::on(fn($v) => is_string($v) && strlen($v) >= 16)) or add an additional expectation using Mockery::on to verify token length, keeping the same call to addSingleValue and the deleteIfValueMatches expectation; target the mock for addSingleValue on the ICacheService to ensure the generated token is meaningful rather than allowing an empty string.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Nitpick comments:
In `@tests/Unit/Services/LockManagerServiceOwnershipTest.php`:
- Around line 139-144: Replace the loose Mockery::type('string') expectation in
LockManagerServiceOwnershipTest (the mock of ICacheService used with
addSingleValue) with a stricter constraint that asserts the token is
non-empty/strong (e.g. Mockery::on(fn($v) => is_string($v) && strlen($v) >= 16))
or add an additional expectation using Mockery::on to verify token length,
keeping the same call to addSingleValue and the deleteIfValueMatches
expectation; target the mock for addSingleValue on the ICacheService to ensure
the generated token is meaningful rather than allowing an empty string.
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: 757f3521-79bb-45c3-a48d-09cc2ce97243
📒 Files selected for processing (4)
Libs/Utils/ICacheService.phpapp/Services/Utils/LockManagerService.phpapp/Services/Utils/RedisCacheService.phptests/Unit/Services/LockManagerServiceOwnershipTest.php
🚧 Files skipped from review as they are similar to previous changes (3)
- app/Services/Utils/RedisCacheService.php
- app/Services/Utils/LockManagerService.php
- Libs/Utils/ICacheService.php
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Summary by CodeRabbit
New Features
Tests