🔥 feat: Add support for stopping timestamp updater #101
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gaby
requested review from
sixcolors,
ReneWerner87 and
efectn
and removed request for
a team
WalkthroughThe changes introduce a mechanism to gracefully stop the timestamp updater goroutine in the Changes
Assessment against linked issues
Poem
📜 Recent review detailsConfiguration used: CodeRabbit UI 📒 Files selected for processing (1)
🚧 Files skipped from review as they are similar to previous changes (1)
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Actionable comments posted: 1
🧹 Nitpick comments (3)
time.go (1)
45-52: Consider adding synchronization for goroutine exitWhile the implementation safely closes the channel, it doesn't guarantee that the goroutine has fully exited before returning. This could be important if the caller needs to ensure cleanup is complete.
Consider adding a WaitGroup:
var ( timestampTimer sync.Once timestamp uint32 stopChan chan struct{} + wg sync.WaitGroup ) func StartTimeStampUpdater() { timestampTimer.Do(func() { atomic.StoreUint32(×tamp, uint32(time.Now().Unix())) stopChan = make(chan struct{}) + wg.Add(1) go func(sleep time.Duration) { + defer wg.Done() ticker := time.NewTicker(sleep) defer ticker.Stop() // ... rest of the code }(1 * time.Second) }) } func StopTimeStampUpdater() { if stopChan != nil { close(stopChan) + wg.Wait() stopChan = nil } }time_test.go (2)
33-57: Enhance test coverage for edge casesWhile the test covers the basic functionality well, consider adding test cases for:
- Multiple calls to StopTimeStampUpdater
- Attempting to restart after stopping
- Race conditions with concurrent start/stop calls
Consider adding these test cases:
func Test_StopTimeStampUpdater_EdgeCases(t *testing.T) { t.Run("multiple stops", func(t *testing.T) { StartTimeStampUpdater() StopTimeStampUpdater() // Should not panic StopTimeStampUpdater() }) t.Run("concurrent start/stop", func(t *testing.T) { var wg sync.WaitGroup for i := 0; i < 10; i++ { wg.Add(2) go func() { defer wg.Done() StartTimeStampUpdater() }() go func() { defer wg.Done() StopTimeStampUpdater() }() } wg.Wait() }) }
42-44: Consider making tests more reliableThe test uses fixed sleep durations which could be flaky in CI environments. Consider using polling with timeout instead.
func waitForUpdate(t *testing.T, initial uint32, timeout time.Duration) uint32 { t.Helper() deadline := time.Now().Add(timeout) for time.Now().Before(deadline) { if current := Timestamp(); current != initial { return current } time.Sleep(10 * time.Millisecond) } t.Fatal("timestamp did not update within timeout") return 0 }Also applies to: 53-54
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📒 Files selected for processing (2)
time.go(2 hunks)time_test.go(1 hunks)
🔇 Additional comments (2)
time.go (2)
12-12: LGTM! Good choice of channel type
Using chan struct{} is the idiomatic way in Go for signal-only channels.
26-39: LGTM! Clean implementation of graceful shutdown
The implementation correctly uses select for handling both ticker updates and shutdown signal. Good use of defer for ticker cleanup.
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #101 +/- ##
==========================================
- Coverage 90.98% 90.76% -0.23%
==========================================
Files 9 9
Lines 488 498 +10
==========================================
+ Hits 444 452 +8
- Misses 31 33 +2
Partials 13 13
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. |
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Actionable comments posted: 2
🧹 Nitpick comments (1)
time.go (1)
12-12: Consider using a more encapsulated designThe package-level
stopChanintroduces shared mutable state. Consider encapsulating the timestamp updater functionality in a struct to better manage its lifecycle and state.Example approach:
type TimestampUpdater struct { stopChan chan struct{} once sync.Once } func NewTimestampUpdater() *TimestampUpdater { return &TimestampUpdater{} }
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (2)
time.go(2 hunks)time_test.go(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- time_test.go
🔇 Additional comments (2)
time.go (2)
23-43: Consider handling restart scenario
The current implementation using sync.Once prevents restarting the timestamp updater after it's stopped.
23-53: Verify usage patterns and potential race conditions
Let's verify the usage patterns and potential race conditions in the codebase.
✅ Verification successful
The initial results show the basic usage patterns, but we need to verify the thread-safety of the global variables and potential race conditions. Let's analyze the global state management and concurrent access patterns more thoroughly.
Implementation is thread-safe but needs cleanup documentation
The implementation has been verified and shows good thread-safety practices:
- Uses
sync.Oncefor one-time initialization - Employs atomic operations for timestamp updates
- Properly manages goroutine lifecycle with channel-based shutdown
- Has test coverage including shutdown verification
However, there are a few points to note:
- The package uses global variables but manages them safely
- The shutdown warning in comments is important but could be more prominent
- Tests verify the functionality but don't explicitly test concurrent access patterns
Recommendations:
- Consider adding a prominent documentation block at the package level about the required cleanup
- Add examples in documentation showing the proper startup/shutdown sequence
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for usage patterns of StartTimeStampUpdater and StopTimeStampUpdater
echo "Checking usage patterns..."
rg "Start.*Time.*Stamp.*Updater|Stop.*Time.*Stamp.*Updater" -A 5
# Look for potential concurrent access
echo "Checking concurrent access patterns..."
rg "go .*Start.*Time.*Stamp.*Updater|go .*Stop.*Time.*Stamp.*Updater"
# Check if there are any tests running these concurrently
echo "Checking concurrent test patterns..."
rg "t.Parallel.*Start.*Time.*Stamp.*Updater|t.Parallel.*Stop.*Time.*Stamp.*Updater"
Length of output: 2193
Script:
#!/bin/bash
# Check for global variable access patterns and potential race conditions
echo "Checking global variable access patterns..."
rg "timestamp|stopChan" -A 3 -B 3
# Check for any other goroutines that might access these variables
echo "Checking goroutine access patterns..."
ast-grep --pattern 'go func() { $$$ }'
# Check for init functions or package level variables
echo "Checking package level variables and init..."
ast-grep --pattern 'var $$$'
Length of output: 2627
Fixes #69
Summary by CodeRabbit
New Features
Bug Fixes
Tests