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Merge pull request #15 from testinprod-io/upstream-v2.44.0-f166e7d
Upstream sync - v2.44.0
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package dbg | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/ledgerwatch/log/v3" | ||
| ) | ||
|
|
||
| // LeakDetector - use it to find which resource was created but not closed (leaked) | ||
| // periodically does print in logs resources which living longer than 1min with their creation stack trace | ||
| // For example db transactions can call Add/Del from Begin/Commit/Rollback methods | ||
| type LeakDetector struct { | ||
| enabled atomic.Bool | ||
| slowThreshold atomic.Pointer[time.Duration] | ||
| autoIncrement atomic.Uint64 | ||
|
|
||
| list map[uint64]LeakDetectorItem | ||
| listLock sync.Mutex | ||
| } | ||
|
|
||
| type LeakDetectorItem struct { | ||
| stack string | ||
| started time.Time | ||
| } | ||
|
|
||
| func NewLeakDetector(name string, slowThreshold time.Duration) *LeakDetector { | ||
| enabled := slowThreshold > 0 | ||
| if !enabled { | ||
| return nil | ||
| } | ||
| d := &LeakDetector{list: map[uint64]LeakDetectorItem{}} | ||
| d.SetSlowThreshold(slowThreshold) | ||
|
|
||
| if enabled { | ||
| go func() { | ||
| logEvery := time.NewTicker(60 * time.Second) | ||
| defer logEvery.Stop() | ||
|
|
||
| for { | ||
| select { | ||
| case <-logEvery.C: | ||
| if list := d.slowList(); len(list) > 0 { | ||
| log.Info(fmt.Sprintf("[dbg.%s] long living resources", name), "list", strings.Join(d.slowList(), ", ")) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| } | ||
| return d | ||
| } | ||
|
|
||
| func (d *LeakDetector) slowList() (res []string) { | ||
| if d == nil || !d.Enabled() { | ||
| return res | ||
| } | ||
| slowThreshold := *d.slowThreshold.Load() | ||
|
|
||
| d.listLock.Lock() | ||
| defer d.listLock.Unlock() | ||
| i := 0 | ||
| for key, value := range d.list { | ||
| living := time.Since(value.started) | ||
| if living > slowThreshold { | ||
| res = append(res, fmt.Sprintf("%d(%s): %s", key, living, value.stack)) | ||
| } | ||
| i++ | ||
| if i > 10 { // protect logs from too many output | ||
| break | ||
| } | ||
| } | ||
| return res | ||
| } | ||
|
|
||
| func (d *LeakDetector) Del(id uint64) { | ||
| if d == nil || !d.Enabled() { | ||
| return | ||
| } | ||
| d.listLock.Lock() | ||
| defer d.listLock.Unlock() | ||
| delete(d.list, id) | ||
| } | ||
| func (d *LeakDetector) Add() uint64 { | ||
| if d == nil || !d.Enabled() { | ||
| return 0 | ||
| } | ||
| ac := LeakDetectorItem{ | ||
| stack: StackSkip(2), | ||
| started: time.Now(), | ||
| } | ||
| id := d.autoIncrement.Add(1) | ||
| d.listLock.Lock() | ||
| defer d.listLock.Unlock() | ||
| d.list[id] = ac | ||
| return id | ||
| } | ||
|
|
||
| func (d *LeakDetector) Enabled() bool { return d.enabled.Load() } | ||
| func (d *LeakDetector) SetSlowThreshold(t time.Duration) { | ||
| d.slowThreshold.Store(&t) | ||
| d.enabled.Store(t > 0) | ||
| } |
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