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fix: Cleanup ResourcePool & Include Mutex Lock for refreshPool #19001

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fix: Cleanup ResourcePool & Include Mutex Lock for refreshPool #19001

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12 changes: 11 additions & 1 deletion go/pools/refresh_pool.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ type (
refreshTicker *time.Ticker
refreshStop chan struct{}
refreshWg sync.WaitGroup
mu sync.Mutex

pool refreshPool
}
Expand Down Expand Up @@ -64,6 +65,9 @@ func (pr *poolRefresh) startRefreshTicker() {
if pr == nil {
return
}
pr.mu.Lock()
defer pr.mu.Unlock()

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Copilot AI Dec 7, 2025

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The startRefreshTicker() method doesn't check if a ticker is already running before creating a new one. This can lead to resource leaks (goroutines and tickers not being cleaned up) if startRefreshTicker() is called multiple times. Consider adding a check after acquiring the lock:

pr.mu.Lock()
defer pr.mu.Unlock()

if pr.refreshTicker != nil {
    return // ticker already running
}

pr.refreshTicker = time.NewTicker(pr.refreshInterval)
...
Suggested change
if pr.refreshTicker != nil {
return // ticker already running
}

Copilot uses AI. Check for mistakes.
pr.refreshTicker = time.NewTicker(pr.refreshInterval)
pr.refreshStop = make(chan struct{})
pr.refreshWg.Add(1)
Expand All @@ -88,10 +92,16 @@ func (pr *poolRefresh) startRefreshTicker() {
}

func (pr *poolRefresh) stop() {
if pr == nil || pr.refreshTicker == nil {
if pr == nil {
return
}
pr.mu.Lock()
if pr.refreshTicker == nil {
pr.mu.Unlock()
return
}
pr.refreshTicker.Stop()
close(pr.refreshStop)
pr.mu.Unlock()
pr.refreshWg.Wait()
}
6 changes: 4 additions & 2 deletions go/pools/resource_pool_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,8 @@ import (
)

var (
lastID, count, closeCount, resetCount atomic.Int64
waitStarts []time.Time
lastID, count, closeCount atomic.Int64
waitStarts []time.Time
)

type TestResource struct {
Expand Down Expand Up @@ -178,6 +178,7 @@ func TestShrinking(t *testing.T) {
waitStarts = waitStarts[:0]

p := NewResourcePool(PoolFactory, 5, 5, time.Second, 0, logWait, nil, 0)
defer p.Close()
var resources [10]Resource
// Leave one empty slot in the pool
for i := 0; i < 4; i++ {
Expand Down Expand Up @@ -365,6 +366,7 @@ func TestReopen(t *testing.T) {
assert.Equal(t, expected, stats)
assert.EqualValues(t, 5, lastID.Load())
assert.EqualValues(t, 0, count.Load())
p.Close()
}

func TestIdleTimeout(t *testing.T) {
Expand Down
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