mirror of
https://github.com/octoleo/restic.git
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Merge pull request #4374 from MichaelEischer/try-refresh-stale-locks
Try to refresh stale locks
This commit is contained in:
commit
bdaec8fdb8
10
changelog/unreleased/issue-4274
Normal file
10
changelog/unreleased/issue-4274
Normal file
@ -0,0 +1,10 @@
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Bugfix: Improve lock refresh handling when using standby
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If the restic process was stopped or the host running restic entered standby
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during a long running operation such as a backup, this resulted in the
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operation failing with `Fatal: failed to refresh lock in time`. We've reworked
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the lock refresh such that restic first checks whether it is safe to continue
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the current operation and only throws an error if not.
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https://github.com/restic/restic/issues/4274
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https://github.com/restic/restic/pull/4374
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@ -506,11 +506,14 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
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if !gopts.JSON {
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if !gopts.JSON {
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progressPrinter.V("lock repository")
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progressPrinter.V("lock repository")
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}
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}
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lock, ctx, err := lockRepo(ctx, repo, gopts.RetryLock, gopts.JSON)
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if !opts.DryRun {
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var lock *restic.Lock
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lock, ctx, err = lockRepo(ctx, repo, gopts.RetryLock, gopts.JSON)
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defer unlockRepo(lock)
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defer unlockRepo(lock)
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if err != nil {
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if err != nil {
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return err
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return err
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}
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}
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}
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// rejectByNameFuncs collect functions that can reject items from the backup based on path only
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// rejectByNameFuncs collect functions that can reject items from the backup based on path only
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rejectByNameFuncs, err := collectRejectByNameFuncs(opts, repo)
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rejectByNameFuncs, err := collectRejectByNameFuncs(opts, repo)
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@ -12,6 +12,7 @@ import (
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)
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)
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type lockContext struct {
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type lockContext struct {
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lock *restic.Lock
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cancel context.CancelFunc
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cancel context.CancelFunc
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refreshWG sync.WaitGroup
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refreshWG sync.WaitGroup
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}
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}
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@ -104,15 +105,17 @@ retryLoop:
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ctx, cancel := context.WithCancel(ctx)
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ctx, cancel := context.WithCancel(ctx)
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lockInfo := &lockContext{
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lockInfo := &lockContext{
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lock: lock,
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cancel: cancel,
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cancel: cancel,
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}
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}
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lockInfo.refreshWG.Add(2)
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lockInfo.refreshWG.Add(2)
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refreshChan := make(chan struct{})
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refreshChan := make(chan struct{})
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forceRefreshChan := make(chan refreshLockRequest)
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globalLocks.Lock()
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globalLocks.Lock()
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globalLocks.locks[lock] = lockInfo
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globalLocks.locks[lock] = lockInfo
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go refreshLocks(ctx, lock, lockInfo, refreshChan)
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go refreshLocks(ctx, repo.Backend(), lockInfo, refreshChan, forceRefreshChan)
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go monitorLockRefresh(ctx, lockInfo, refreshChan)
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go monitorLockRefresh(ctx, lockInfo, refreshChan, forceRefreshChan)
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globalLocks.Unlock()
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globalLocks.Unlock()
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return lock, ctx, err
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return lock, ctx, err
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@ -124,8 +127,13 @@ var refreshInterval = 5 * time.Minute
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// the difference allows to compensate for a small time drift between clients.
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// the difference allows to compensate for a small time drift between clients.
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var refreshabilityTimeout = restic.StaleLockTimeout - refreshInterval*3/2
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var refreshabilityTimeout = restic.StaleLockTimeout - refreshInterval*3/2
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func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext, refreshed chan<- struct{}) {
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type refreshLockRequest struct {
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result chan bool
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}
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func refreshLocks(ctx context.Context, backend restic.Backend, lockInfo *lockContext, refreshed chan<- struct{}, forceRefresh <-chan refreshLockRequest) {
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debug.Log("start")
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debug.Log("start")
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lock := lockInfo.lock
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ticker := time.NewTicker(refreshInterval)
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ticker := time.NewTicker(refreshInterval)
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lastRefresh := lock.Time
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lastRefresh := lock.Time
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@ -149,6 +157,22 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
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case <-ctx.Done():
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case <-ctx.Done():
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debug.Log("terminate")
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debug.Log("terminate")
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return
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return
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case req := <-forceRefresh:
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debug.Log("trying to refresh stale lock")
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// keep on going if our current lock still exists
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success := tryRefreshStaleLock(ctx, backend, lock, lockInfo.cancel)
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// inform refresh goroutine about forced refresh
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select {
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case <-ctx.Done():
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case req.result <- success:
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}
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if success {
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// update lock refresh time
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lastRefresh = lock.Time
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}
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case <-ticker.C:
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case <-ticker.C:
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if time.Since(lastRefresh) > refreshabilityTimeout {
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if time.Since(lastRefresh) > refreshabilityTimeout {
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// the lock is too old, wait until the expiry monitor cancels the context
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// the lock is too old, wait until the expiry monitor cancels the context
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@ -161,7 +185,7 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
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Warnf("unable to refresh lock: %v\n", err)
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Warnf("unable to refresh lock: %v\n", err)
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} else {
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} else {
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lastRefresh = lock.Time
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lastRefresh = lock.Time
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// inform monitor gorountine about successful refresh
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// inform monitor goroutine about successful refresh
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select {
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select {
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case <-ctx.Done():
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case <-ctx.Done():
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case refreshed <- struct{}{}:
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case refreshed <- struct{}{}:
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@ -171,7 +195,7 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
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}
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}
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}
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}
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func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-chan struct{}) {
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func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-chan struct{}, forceRefresh chan<- refreshLockRequest) {
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// time.Now() might use a monotonic timer which is paused during standby
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// time.Now() might use a monotonic timer which is paused during standby
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// convert to unix time to ensure we compare real time values
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// convert to unix time to ensure we compare real time values
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lastRefresh := time.Now().UnixNano()
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lastRefresh := time.Now().UnixNano()
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@ -183,24 +207,47 @@ func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-
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// timers are paused during standby, which is a problem as the refresh timeout
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// timers are paused during standby, which is a problem as the refresh timeout
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// _must_ expire if the host was too long in standby. Thus fall back to periodic checks
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// _must_ expire if the host was too long in standby. Thus fall back to periodic checks
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// https://github.com/golang/go/issues/35012
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// https://github.com/golang/go/issues/35012
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timer := time.NewTimer(pollDuration)
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ticker := time.NewTicker(pollDuration)
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defer func() {
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defer func() {
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timer.Stop()
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ticker.Stop()
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lockInfo.cancel()
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lockInfo.cancel()
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lockInfo.refreshWG.Done()
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lockInfo.refreshWG.Done()
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}()
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}()
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var refreshStaleLockResult chan bool
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for {
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for {
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select {
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select {
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case <-ctx.Done():
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case <-ctx.Done():
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debug.Log("terminate expiry monitoring")
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debug.Log("terminate expiry monitoring")
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return
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return
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case <-refreshed:
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case <-refreshed:
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if refreshStaleLockResult != nil {
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// ignore delayed refresh notifications while the stale lock is refreshed
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continue
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}
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lastRefresh = time.Now().UnixNano()
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lastRefresh = time.Now().UnixNano()
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case <-timer.C:
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case <-ticker.C:
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if time.Now().UnixNano()-lastRefresh < refreshabilityTimeout.Nanoseconds() {
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if time.Now().UnixNano()-lastRefresh < refreshabilityTimeout.Nanoseconds() || refreshStaleLockResult != nil {
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// restart timer
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continue
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timer.Reset(pollDuration)
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}
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debug.Log("trying to refreshStaleLock")
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// keep on going if our current lock still exists
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refreshReq := refreshLockRequest{
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result: make(chan bool),
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}
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refreshStaleLockResult = refreshReq.result
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// inform refresh goroutine about forced refresh
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select {
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case <-ctx.Done():
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case forceRefresh <- refreshReq:
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}
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case success := <-refreshStaleLockResult:
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if success {
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lastRefresh = time.Now().UnixNano()
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refreshStaleLockResult = nil
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continue
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continue
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}
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}
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@ -210,6 +257,25 @@ func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-
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}
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}
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}
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}
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func tryRefreshStaleLock(ctx context.Context, backend restic.Backend, lock *restic.Lock, cancel context.CancelFunc) bool {
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freeze := restic.AsBackend[restic.FreezeBackend](backend)
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if freeze != nil {
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debug.Log("freezing backend")
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freeze.Freeze()
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defer freeze.Unfreeze()
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}
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err := lock.RefreshStaleLock(ctx)
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if err != nil {
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Warnf("failed to refresh stale lock: %v\n", err)
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// cancel context while the backend is still frozen to prevent accidental modifications
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cancel()
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return false
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}
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return true
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}
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func unlockRepo(lock *restic.Lock) {
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func unlockRepo(lock *restic.Lock) {
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if lock == nil {
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if lock == nil {
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return
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return
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@ -5,16 +5,26 @@ import (
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"fmt"
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"fmt"
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"runtime"
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"runtime"
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"strings"
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"strings"
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"sync"
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"testing"
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"testing"
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"time"
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"time"
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"github.com/restic/restic/internal/backend/location"
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"github.com/restic/restic/internal/backend/mem"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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"github.com/restic/restic/internal/test"
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)
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)
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func openTestRepo(t *testing.T, wrapper backendWrapper) (*repository.Repository, func(), *testEnvironment) {
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func openLockTestRepo(t *testing.T, wrapper backendWrapper) (*repository.Repository, func(), *testEnvironment) {
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env, cleanup := withTestEnvironment(t)
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env, cleanup := withTestEnvironment(t)
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reg := location.NewRegistry()
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reg.Register(mem.NewFactory())
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env.gopts.backends = reg
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env.gopts.Repo = "mem:"
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if wrapper != nil {
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if wrapper != nil {
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env.gopts.backendTestHook = wrapper
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env.gopts.backendTestHook = wrapper
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}
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}
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@ -36,7 +46,7 @@ func checkedLockRepo(ctx context.Context, t *testing.T, repo restic.Repository,
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}
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}
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func TestLock(t *testing.T) {
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func TestLock(t *testing.T) {
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repo, cleanup, env := openTestRepo(t, nil)
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repo, cleanup, env := openLockTestRepo(t, nil)
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defer cleanup()
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defer cleanup()
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lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
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lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
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@ -47,7 +57,7 @@ func TestLock(t *testing.T) {
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}
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}
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func TestLockCancel(t *testing.T) {
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func TestLockCancel(t *testing.T) {
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repo, cleanup, env := openTestRepo(t, nil)
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repo, cleanup, env := openLockTestRepo(t, nil)
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defer cleanup()
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defer cleanup()
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|
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ctx, cancel := context.WithCancel(context.Background())
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ctx, cancel := context.WithCancel(context.Background())
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@ -63,7 +73,7 @@ func TestLockCancel(t *testing.T) {
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}
|
}
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|
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func TestLockUnlockAll(t *testing.T) {
|
func TestLockUnlockAll(t *testing.T) {
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repo, cleanup, env := openTestRepo(t, nil)
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repo, cleanup, env := openLockTestRepo(t, nil)
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defer cleanup()
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defer cleanup()
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|
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lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
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lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
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@ -78,7 +88,7 @@ func TestLockUnlockAll(t *testing.T) {
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}
|
}
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|
|
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func TestLockConflict(t *testing.T) {
|
func TestLockConflict(t *testing.T) {
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repo, cleanup, env := openTestRepo(t, nil)
|
repo, cleanup, env := openLockTestRepo(t, nil)
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defer cleanup()
|
defer cleanup()
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repo2, err := OpenRepository(context.TODO(), env.gopts)
|
repo2, err := OpenRepository(context.TODO(), env.gopts)
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test.OK(t, err)
|
test.OK(t, err)
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@ -107,7 +117,7 @@ func (b *writeOnceBackend) Save(ctx context.Context, h restic.Handle, rd restic.
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}
|
}
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|
|
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func TestLockFailedRefresh(t *testing.T) {
|
func TestLockFailedRefresh(t *testing.T) {
|
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repo, cleanup, env := openTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
|
repo, cleanup, env := openLockTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
|
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return &writeOnceBackend{Backend: r}, nil
|
return &writeOnceBackend{Backend: r}, nil
|
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})
|
})
|
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defer cleanup()
|
defer cleanup()
|
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@ -145,7 +155,7 @@ func (b *loggingBackend) Save(ctx context.Context, h restic.Handle, rd restic.Re
|
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}
|
}
|
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|
|
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func TestLockSuccessfulRefresh(t *testing.T) {
|
func TestLockSuccessfulRefresh(t *testing.T) {
|
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repo, cleanup, env := openTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
|
repo, cleanup, env := openLockTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
|
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return &loggingBackend{
|
return &loggingBackend{
|
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Backend: r,
|
Backend: r,
|
||||||
t: t,
|
t: t,
|
||||||
@ -182,8 +192,71 @@ func TestLockSuccessfulRefresh(t *testing.T) {
|
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unlockRepo(lock)
|
unlockRepo(lock)
|
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}
|
}
|
||||||
|
|
||||||
|
type slowBackend struct {
|
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|
restic.Backend
|
||||||
|
m sync.Mutex
|
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|
sleep time.Duration
|
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|
}
|
||||||
|
|
||||||
|
func (b *slowBackend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
|
||||||
|
b.m.Lock()
|
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|
sleep := b.sleep
|
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|
b.m.Unlock()
|
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|
time.Sleep(sleep)
|
||||||
|
return b.Backend.Save(ctx, h, rd)
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestLockSuccessfulStaleRefresh(t *testing.T) {
|
||||||
|
var sb *slowBackend
|
||||||
|
repo, cleanup, env := openLockTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
|
||||||
|
sb = &slowBackend{Backend: r}
|
||||||
|
return sb, nil
|
||||||
|
})
|
||||||
|
defer cleanup()
|
||||||
|
|
||||||
|
t.Logf("test for successful lock refresh %v", time.Now())
|
||||||
|
// reduce locking intervals to be suitable for testing
|
||||||
|
ri, rt := refreshInterval, refreshabilityTimeout
|
||||||
|
refreshInterval = 10 * time.Millisecond
|
||||||
|
refreshabilityTimeout = 50 * time.Millisecond
|
||||||
|
defer func() {
|
||||||
|
refreshInterval, refreshabilityTimeout = ri, rt
|
||||||
|
}()
|
||||||
|
|
||||||
|
lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
|
||||||
|
// delay lock refreshing long enough that the lock would expire
|
||||||
|
sb.m.Lock()
|
||||||
|
sb.sleep = refreshabilityTimeout + refreshInterval
|
||||||
|
sb.m.Unlock()
|
||||||
|
|
||||||
|
select {
|
||||||
|
case <-wrappedCtx.Done():
|
||||||
|
// don't call t.Fatal to allow the lock to be properly cleaned up
|
||||||
|
t.Error("lock refresh failed", time.Now())
|
||||||
|
|
||||||
|
case <-time.After(refreshabilityTimeout):
|
||||||
|
}
|
||||||
|
// reset slow backend
|
||||||
|
sb.m.Lock()
|
||||||
|
sb.sleep = 0
|
||||||
|
sb.m.Unlock()
|
||||||
|
debug.Log("normal lock period has expired")
|
||||||
|
|
||||||
|
select {
|
||||||
|
case <-wrappedCtx.Done():
|
||||||
|
// don't call t.Fatal to allow the lock to be properly cleaned up
|
||||||
|
t.Error("lock refresh failed", time.Now())
|
||||||
|
|
||||||
|
case <-time.After(3 * refreshabilityTimeout):
|
||||||
|
// expected lock refresh to work
|
||||||
|
}
|
||||||
|
|
||||||
|
// unlockRepo should not crash
|
||||||
|
unlockRepo(lock)
|
||||||
|
}
|
||||||
|
|
||||||
func TestLockWaitTimeout(t *testing.T) {
|
func TestLockWaitTimeout(t *testing.T) {
|
||||||
repo, cleanup, env := openTestRepo(t, nil)
|
repo, cleanup, env := openLockTestRepo(t, nil)
|
||||||
defer cleanup()
|
defer cleanup()
|
||||||
|
|
||||||
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
||||||
@ -205,8 +278,9 @@ func TestLockWaitTimeout(t *testing.T) {
|
|||||||
test.OK(t, lock.Unlock())
|
test.OK(t, lock.Unlock())
|
||||||
test.OK(t, elock.Unlock())
|
test.OK(t, elock.Unlock())
|
||||||
}
|
}
|
||||||
|
|
||||||
func TestLockWaitCancel(t *testing.T) {
|
func TestLockWaitCancel(t *testing.T) {
|
||||||
repo, cleanup, env := openTestRepo(t, nil)
|
repo, cleanup, env := openLockTestRepo(t, nil)
|
||||||
defer cleanup()
|
defer cleanup()
|
||||||
|
|
||||||
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
||||||
@ -215,10 +289,10 @@ func TestLockWaitCancel(t *testing.T) {
|
|||||||
retryLock := 200 * time.Millisecond
|
retryLock := 200 * time.Millisecond
|
||||||
cancelAfter := 40 * time.Millisecond
|
cancelAfter := 40 * time.Millisecond
|
||||||
|
|
||||||
|
start := time.Now()
|
||||||
ctx, cancel := context.WithCancel(context.TODO())
|
ctx, cancel := context.WithCancel(context.TODO())
|
||||||
time.AfterFunc(cancelAfter, cancel)
|
time.AfterFunc(cancelAfter, cancel)
|
||||||
|
|
||||||
start := time.Now()
|
|
||||||
lock, _, err := lockRepo(ctx, repo, retryLock, env.gopts.JSON)
|
lock, _, err := lockRepo(ctx, repo, retryLock, env.gopts.JSON)
|
||||||
duration := time.Since(start)
|
duration := time.Since(start)
|
||||||
|
|
||||||
@ -227,14 +301,14 @@ func TestLockWaitCancel(t *testing.T) {
|
|||||||
test.Assert(t, strings.Contains(err.Error(), "context canceled"),
|
test.Assert(t, strings.Contains(err.Error(), "context canceled"),
|
||||||
"create normal lock with exclusively locked repo didn't return the correct error")
|
"create normal lock with exclusively locked repo didn't return the correct error")
|
||||||
test.Assert(t, cancelAfter <= duration && duration < retryLock-10*time.Millisecond,
|
test.Assert(t, cancelAfter <= duration && duration < retryLock-10*time.Millisecond,
|
||||||
"create normal lock with exclusively locked repo didn't return in time")
|
"create normal lock with exclusively locked repo didn't return in time, duration %v", duration)
|
||||||
|
|
||||||
test.OK(t, lock.Unlock())
|
test.OK(t, lock.Unlock())
|
||||||
test.OK(t, elock.Unlock())
|
test.OK(t, elock.Unlock())
|
||||||
}
|
}
|
||||||
|
|
||||||
func TestLockWaitSuccess(t *testing.T) {
|
func TestLockWaitSuccess(t *testing.T) {
|
||||||
repo, cleanup, env := openTestRepo(t, nil)
|
repo, cleanup, env := openLockTestRepo(t, nil)
|
||||||
defer cleanup()
|
defer cleanup()
|
||||||
|
|
||||||
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)
|
||||||
|
@ -3,6 +3,7 @@ package sema
|
|||||||
import (
|
import (
|
||||||
"context"
|
"context"
|
||||||
"io"
|
"io"
|
||||||
|
"sync"
|
||||||
|
|
||||||
"github.com/cenkalti/backoff/v4"
|
"github.com/cenkalti/backoff/v4"
|
||||||
"github.com/restic/restic/internal/errors"
|
"github.com/restic/restic/internal/errors"
|
||||||
@ -16,6 +17,7 @@ var _ restic.Backend = &connectionLimitedBackend{}
|
|||||||
type connectionLimitedBackend struct {
|
type connectionLimitedBackend struct {
|
||||||
restic.Backend
|
restic.Backend
|
||||||
sem semaphore
|
sem semaphore
|
||||||
|
freezeLock sync.Mutex
|
||||||
}
|
}
|
||||||
|
|
||||||
// NewBackend creates a backend that limits the concurrent operations on the underlying backend
|
// NewBackend creates a backend that limits the concurrent operations on the underlying backend
|
||||||
@ -39,9 +41,23 @@ func (be *connectionLimitedBackend) typeDependentLimit(t restic.FileType) func()
|
|||||||
return func() {}
|
return func() {}
|
||||||
}
|
}
|
||||||
be.sem.GetToken()
|
be.sem.GetToken()
|
||||||
|
// prevent token usage while the backend is frozen
|
||||||
|
be.freezeLock.Lock()
|
||||||
|
defer be.freezeLock.Unlock()
|
||||||
|
|
||||||
return be.sem.ReleaseToken
|
return be.sem.ReleaseToken
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// Freeze blocks all backend operations except those on lock files
|
||||||
|
func (be *connectionLimitedBackend) Freeze() {
|
||||||
|
be.freezeLock.Lock()
|
||||||
|
}
|
||||||
|
|
||||||
|
// Unfreeze allows all backend operations to continue
|
||||||
|
func (be *connectionLimitedBackend) Unfreeze() {
|
||||||
|
be.freezeLock.Unlock()
|
||||||
|
}
|
||||||
|
|
||||||
// Save adds new Data to the backend.
|
// Save adds new Data to the backend.
|
||||||
func (be *connectionLimitedBackend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
|
func (be *connectionLimitedBackend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
|
||||||
if err := h.Valid(); err != nil {
|
if err := h.Valid(); err != nil {
|
||||||
@ -50,6 +66,10 @@ func (be *connectionLimitedBackend) Save(ctx context.Context, h restic.Handle, r
|
|||||||
|
|
||||||
defer be.typeDependentLimit(h.Type)()
|
defer be.typeDependentLimit(h.Type)()
|
||||||
|
|
||||||
|
if ctx.Err() != nil {
|
||||||
|
return ctx.Err()
|
||||||
|
}
|
||||||
|
|
||||||
return be.Backend.Save(ctx, h, rd)
|
return be.Backend.Save(ctx, h, rd)
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -68,6 +88,10 @@ func (be *connectionLimitedBackend) Load(ctx context.Context, h restic.Handle, l
|
|||||||
|
|
||||||
defer be.typeDependentLimit(h.Type)()
|
defer be.typeDependentLimit(h.Type)()
|
||||||
|
|
||||||
|
if ctx.Err() != nil {
|
||||||
|
return ctx.Err()
|
||||||
|
}
|
||||||
|
|
||||||
return be.Backend.Load(ctx, h, length, offset, fn)
|
return be.Backend.Load(ctx, h, length, offset, fn)
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -79,6 +103,10 @@ func (be *connectionLimitedBackend) Stat(ctx context.Context, h restic.Handle) (
|
|||||||
|
|
||||||
defer be.typeDependentLimit(h.Type)()
|
defer be.typeDependentLimit(h.Type)()
|
||||||
|
|
||||||
|
if ctx.Err() != nil {
|
||||||
|
return restic.FileInfo{}, ctx.Err()
|
||||||
|
}
|
||||||
|
|
||||||
return be.Backend.Stat(ctx, h)
|
return be.Backend.Stat(ctx, h)
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -90,6 +118,10 @@ func (be *connectionLimitedBackend) Remove(ctx context.Context, h restic.Handle)
|
|||||||
|
|
||||||
defer be.typeDependentLimit(h.Type)()
|
defer be.typeDependentLimit(h.Type)()
|
||||||
|
|
||||||
|
if ctx.Err() != nil {
|
||||||
|
return ctx.Err()
|
||||||
|
}
|
||||||
|
|
||||||
return be.Backend.Remove(ctx, h)
|
return be.Backend.Remove(ctx, h)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -3,6 +3,7 @@ package sema_test
|
|||||||
import (
|
import (
|
||||||
"context"
|
"context"
|
||||||
"io"
|
"io"
|
||||||
|
"sync"
|
||||||
"sync/atomic"
|
"sync/atomic"
|
||||||
"testing"
|
"testing"
|
||||||
"time"
|
"time"
|
||||||
@ -197,3 +198,38 @@ func TestConcurrencyUnlimitedLockSave(t *testing.T) {
|
|||||||
}
|
}
|
||||||
}, unblock, true)
|
}, unblock, true)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func TestFreeze(t *testing.T) {
|
||||||
|
var counter int64
|
||||||
|
m := mock.NewBackend()
|
||||||
|
m.SaveFn = func(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
|
||||||
|
atomic.AddInt64(&counter, 1)
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
m.ConnectionsFn = func() uint { return 2 }
|
||||||
|
be := sema.NewBackend(m)
|
||||||
|
fb := be.(restic.FreezeBackend)
|
||||||
|
|
||||||
|
// Freeze backend
|
||||||
|
fb.Freeze()
|
||||||
|
|
||||||
|
// Start Save call that should block
|
||||||
|
var wg sync.WaitGroup
|
||||||
|
wg.Add(1)
|
||||||
|
go func() {
|
||||||
|
defer wg.Done()
|
||||||
|
h := restic.Handle{Type: restic.PackFile, Name: "foobar"}
|
||||||
|
test.OK(t, be.Save(context.TODO(), h, nil))
|
||||||
|
}()
|
||||||
|
|
||||||
|
// check
|
||||||
|
time.Sleep(1 * time.Millisecond)
|
||||||
|
val := atomic.LoadInt64(&counter)
|
||||||
|
test.Assert(t, val == 0, "save call worked despite frozen backend")
|
||||||
|
|
||||||
|
// unfreeze and check that save did complete
|
||||||
|
fb.Unfreeze()
|
||||||
|
wg.Wait()
|
||||||
|
val = atomic.LoadInt64(&counter)
|
||||||
|
test.Assert(t, val == 1, "save call should have completed")
|
||||||
|
}
|
||||||
|
@ -21,26 +21,9 @@ func init() {
|
|||||||
// "default" layout.
|
// "default" layout.
|
||||||
type S3Layout struct{}
|
type S3Layout struct{}
|
||||||
|
|
||||||
func toS3Backend(b restic.Backend) *s3.Backend {
|
|
||||||
for b != nil {
|
|
||||||
if be, ok := b.(*s3.Backend); ok {
|
|
||||||
return be
|
|
||||||
}
|
|
||||||
|
|
||||||
if be, ok := b.(restic.BackendUnwrapper); ok {
|
|
||||||
b = be.Unwrap()
|
|
||||||
} else {
|
|
||||||
// not the backend we're looking for
|
|
||||||
break
|
|
||||||
}
|
|
||||||
}
|
|
||||||
debug.Log("backend is not s3")
|
|
||||||
return nil
|
|
||||||
}
|
|
||||||
|
|
||||||
// Check tests whether the migration can be applied.
|
// Check tests whether the migration can be applied.
|
||||||
func (m *S3Layout) Check(_ context.Context, repo restic.Repository) (bool, string, error) {
|
func (m *S3Layout) Check(_ context.Context, repo restic.Repository) (bool, string, error) {
|
||||||
be := toS3Backend(repo.Backend())
|
be := restic.AsBackend[*s3.Backend](repo.Backend())
|
||||||
if be == nil {
|
if be == nil {
|
||||||
debug.Log("backend is not s3")
|
debug.Log("backend is not s3")
|
||||||
return false, "backend is not s3", nil
|
return false, "backend is not s3", nil
|
||||||
@ -92,7 +75,7 @@ func (m *S3Layout) moveFiles(ctx context.Context, be *s3.Backend, l layout.Layou
|
|||||||
|
|
||||||
// Apply runs the migration.
|
// Apply runs the migration.
|
||||||
func (m *S3Layout) Apply(ctx context.Context, repo restic.Repository) error {
|
func (m *S3Layout) Apply(ctx context.Context, repo restic.Repository) error {
|
||||||
be := toS3Backend(repo.Backend())
|
be := restic.AsBackend[*s3.Backend](repo.Backend())
|
||||||
if be == nil {
|
if be == nil {
|
||||||
debug.Log("backend is not s3")
|
debug.Log("backend is not s3")
|
||||||
return errors.New("backend is not s3")
|
return errors.New("backend is not s3")
|
||||||
|
@ -1,27 +0,0 @@
|
|||||||
package migrations
|
|
||||||
|
|
||||||
import (
|
|
||||||
"testing"
|
|
||||||
|
|
||||||
"github.com/restic/restic/internal/backend/mock"
|
|
||||||
"github.com/restic/restic/internal/backend/s3"
|
|
||||||
"github.com/restic/restic/internal/cache"
|
|
||||||
"github.com/restic/restic/internal/test"
|
|
||||||
)
|
|
||||||
|
|
||||||
func TestS3UnwrapBackend(t *testing.T) {
|
|
||||||
// toS3Backend(b restic.Backend) *s3.Backend
|
|
||||||
|
|
||||||
m := mock.NewBackend()
|
|
||||||
test.Assert(t, toS3Backend(m) == nil, "mock backend is not an s3 backend")
|
|
||||||
|
|
||||||
// uninitialized fake backend for testing
|
|
||||||
s3 := &s3.Backend{}
|
|
||||||
test.Assert(t, toS3Backend(s3) == s3, "s3 was not returned")
|
|
||||||
|
|
||||||
c := &cache.Backend{Backend: s3}
|
|
||||||
test.Assert(t, toS3Backend(c) == s3, "failed to unwrap s3 backend")
|
|
||||||
|
|
||||||
c.Backend = m
|
|
||||||
test.Assert(t, toS3Backend(c) == nil, "a wrapped mock backend is not an s3 backend")
|
|
||||||
}
|
|
@ -75,6 +75,31 @@ type BackendUnwrapper interface {
|
|||||||
Unwrap() Backend
|
Unwrap() Backend
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func AsBackend[B Backend](b Backend) B {
|
||||||
|
for b != nil {
|
||||||
|
if be, ok := b.(B); ok {
|
||||||
|
return be
|
||||||
|
}
|
||||||
|
|
||||||
|
if be, ok := b.(BackendUnwrapper); ok {
|
||||||
|
b = be.Unwrap()
|
||||||
|
} else {
|
||||||
|
// not the backend we're looking for
|
||||||
|
break
|
||||||
|
}
|
||||||
|
}
|
||||||
|
var be B
|
||||||
|
return be
|
||||||
|
}
|
||||||
|
|
||||||
|
type FreezeBackend interface {
|
||||||
|
Backend
|
||||||
|
// Freeze blocks all backend operations except those on lock files
|
||||||
|
Freeze()
|
||||||
|
// Unfreeze allows all backend operations to continue
|
||||||
|
Unfreeze()
|
||||||
|
}
|
||||||
|
|
||||||
// FileInfo is contains information about a file in the backend.
|
// FileInfo is contains information about a file in the backend.
|
||||||
type FileInfo struct {
|
type FileInfo struct {
|
||||||
Size int64
|
Size int64
|
||||||
|
38
internal/restic/backend_test.go
Normal file
38
internal/restic/backend_test.go
Normal file
@ -0,0 +1,38 @@
|
|||||||
|
package restic_test
|
||||||
|
|
||||||
|
import (
|
||||||
|
"testing"
|
||||||
|
|
||||||
|
"github.com/restic/restic/internal/restic"
|
||||||
|
"github.com/restic/restic/internal/test"
|
||||||
|
)
|
||||||
|
|
||||||
|
type testBackend struct {
|
||||||
|
restic.Backend
|
||||||
|
}
|
||||||
|
|
||||||
|
func (t *testBackend) Unwrap() restic.Backend {
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
type otherTestBackend struct {
|
||||||
|
restic.Backend
|
||||||
|
}
|
||||||
|
|
||||||
|
func (t *otherTestBackend) Unwrap() restic.Backend {
|
||||||
|
return t.Backend
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestAsBackend(t *testing.T) {
|
||||||
|
other := otherTestBackend{}
|
||||||
|
test.Assert(t, restic.AsBackend[*testBackend](other) == nil, "otherTestBackend is not a testBackend backend")
|
||||||
|
|
||||||
|
testBe := &testBackend{}
|
||||||
|
test.Assert(t, restic.AsBackend[*testBackend](testBe) == testBe, "testBackend was not returned")
|
||||||
|
|
||||||
|
wrapper := &otherTestBackend{Backend: testBe}
|
||||||
|
test.Assert(t, restic.AsBackend[*testBackend](wrapper) == testBe, "failed to unwrap testBackend backend")
|
||||||
|
|
||||||
|
wrapper.Backend = other
|
||||||
|
test.Assert(t, restic.AsBackend[*testBackend](wrapper) == nil, "a wrapped otherTestBackend is not a testBackend")
|
||||||
|
}
|
@ -81,6 +81,8 @@ func IsInvalidLock(err error) bool {
|
|||||||
return errors.As(err, &e)
|
return errors.As(err, &e)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
var ErrRemovedLock = errors.New("lock file was removed in the meantime")
|
||||||
|
|
||||||
// NewLock returns a new, non-exclusive lock for the repository. If an
|
// NewLock returns a new, non-exclusive lock for the repository. If an
|
||||||
// exclusive lock is already held by another process, it returns an error
|
// exclusive lock is already held by another process, it returns an error
|
||||||
// that satisfies IsAlreadyLocked.
|
// that satisfies IsAlreadyLocked.
|
||||||
@ -274,6 +276,68 @@ func (l *Lock) Refresh(ctx context.Context) error {
|
|||||||
return l.repo.Backend().Remove(context.TODO(), Handle{Type: LockFile, Name: oldLockID.String()})
|
return l.repo.Backend().Remove(context.TODO(), Handle{Type: LockFile, Name: oldLockID.String()})
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// RefreshStaleLock is an extended variant of Refresh that can also refresh stale lock files.
|
||||||
|
func (l *Lock) RefreshStaleLock(ctx context.Context) error {
|
||||||
|
debug.Log("refreshing stale lock %v", l.lockID)
|
||||||
|
// refreshing a stale lock is possible if it still exists and continues to do
|
||||||
|
// so until after creating a new lock. The initial check avoids creating a new
|
||||||
|
// lock file if this lock was already removed in the meantime.
|
||||||
|
exists, err := l.checkExistence(ctx)
|
||||||
|
if err != nil {
|
||||||
|
return err
|
||||||
|
} else if !exists {
|
||||||
|
return ErrRemovedLock
|
||||||
|
}
|
||||||
|
|
||||||
|
l.lock.Lock()
|
||||||
|
l.Time = time.Now()
|
||||||
|
l.lock.Unlock()
|
||||||
|
id, err := l.createLock(ctx)
|
||||||
|
if err != nil {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
|
||||||
|
time.Sleep(waitBeforeLockCheck)
|
||||||
|
|
||||||
|
exists, err = l.checkExistence(ctx)
|
||||||
|
if err != nil {
|
||||||
|
// cleanup replacement lock
|
||||||
|
_ = l.repo.Backend().Remove(context.TODO(), Handle{Type: LockFile, Name: id.String()})
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
|
||||||
|
if !exists {
|
||||||
|
// cleanup replacement lock
|
||||||
|
_ = l.repo.Backend().Remove(context.TODO(), Handle{Type: LockFile, Name: id.String()})
|
||||||
|
return ErrRemovedLock
|
||||||
|
}
|
||||||
|
|
||||||
|
l.lock.Lock()
|
||||||
|
defer l.lock.Unlock()
|
||||||
|
|
||||||
|
debug.Log("new lock ID %v", id)
|
||||||
|
oldLockID := l.lockID
|
||||||
|
l.lockID = &id
|
||||||
|
|
||||||
|
return l.repo.Backend().Remove(context.TODO(), Handle{Type: LockFile, Name: oldLockID.String()})
|
||||||
|
}
|
||||||
|
|
||||||
|
func (l *Lock) checkExistence(ctx context.Context) (bool, error) {
|
||||||
|
l.lock.Lock()
|
||||||
|
defer l.lock.Unlock()
|
||||||
|
|
||||||
|
exists := false
|
||||||
|
|
||||||
|
err := l.repo.Backend().List(ctx, LockFile, func(fi FileInfo) error {
|
||||||
|
if fi.Name == l.lockID.String() {
|
||||||
|
exists = true
|
||||||
|
}
|
||||||
|
return nil
|
||||||
|
})
|
||||||
|
|
||||||
|
return exists, err
|
||||||
|
}
|
||||||
|
|
||||||
func (l *Lock) String() string {
|
func (l *Lock) String() string {
|
||||||
l.lock.Lock()
|
l.lock.Lock()
|
||||||
defer l.lock.Unlock()
|
defer l.lock.Unlock()
|
||||||
|
@ -16,6 +16,7 @@ import (
|
|||||||
|
|
||||||
func TestLock(t *testing.T) {
|
func TestLock(t *testing.T) {
|
||||||
repo := repository.TestRepository(t)
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
lock, err := restic.NewLock(context.TODO(), repo)
|
lock, err := restic.NewLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -25,6 +26,7 @@ func TestLock(t *testing.T) {
|
|||||||
|
|
||||||
func TestDoubleUnlock(t *testing.T) {
|
func TestDoubleUnlock(t *testing.T) {
|
||||||
repo := repository.TestRepository(t)
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
lock, err := restic.NewLock(context.TODO(), repo)
|
lock, err := restic.NewLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -38,6 +40,7 @@ func TestDoubleUnlock(t *testing.T) {
|
|||||||
|
|
||||||
func TestMultipleLock(t *testing.T) {
|
func TestMultipleLock(t *testing.T) {
|
||||||
repo := repository.TestRepository(t)
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
lock1, err := restic.NewLock(context.TODO(), repo)
|
lock1, err := restic.NewLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -63,6 +66,7 @@ func (be *failLockLoadingBackend) Load(ctx context.Context, h restic.Handle, len
|
|||||||
func TestMultipleLockFailure(t *testing.T) {
|
func TestMultipleLockFailure(t *testing.T) {
|
||||||
be := &failLockLoadingBackend{Backend: mem.New()}
|
be := &failLockLoadingBackend{Backend: mem.New()}
|
||||||
repo := repository.TestRepositoryWithBackend(t, be, 0)
|
repo := repository.TestRepositoryWithBackend(t, be, 0)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
lock1, err := restic.NewLock(context.TODO(), repo)
|
lock1, err := restic.NewLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -83,6 +87,7 @@ func TestLockExclusive(t *testing.T) {
|
|||||||
|
|
||||||
func TestLockOnExclusiveLockedRepo(t *testing.T) {
|
func TestLockOnExclusiveLockedRepo(t *testing.T) {
|
||||||
repo := repository.TestRepository(t)
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
elock, err := restic.NewExclusiveLock(context.TODO(), repo)
|
elock, err := restic.NewExclusiveLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -99,6 +104,7 @@ func TestLockOnExclusiveLockedRepo(t *testing.T) {
|
|||||||
|
|
||||||
func TestExclusiveLockOnLockedRepo(t *testing.T) {
|
func TestExclusiveLockOnLockedRepo(t *testing.T) {
|
||||||
repo := repository.TestRepository(t)
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
elock, err := restic.NewLock(context.TODO(), repo)
|
elock, err := restic.NewLock(context.TODO(), repo)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
@ -247,15 +253,10 @@ func TestRemoveAllLocks(t *testing.T) {
|
|||||||
3, processed)
|
3, processed)
|
||||||
}
|
}
|
||||||
|
|
||||||
func TestLockRefresh(t *testing.T) {
|
func checkSingleLock(t *testing.T, repo restic.Repository) restic.ID {
|
||||||
repo := repository.TestRepository(t)
|
t.Helper()
|
||||||
|
|
||||||
lock, err := restic.NewLock(context.TODO(), repo)
|
|
||||||
rtest.OK(t, err)
|
|
||||||
time0 := lock.Time
|
|
||||||
|
|
||||||
var lockID *restic.ID
|
var lockID *restic.ID
|
||||||
err = repo.List(context.TODO(), restic.LockFile, func(id restic.ID, size int64) error {
|
err := repo.List(context.TODO(), restic.LockFile, func(id restic.ID, size int64) error {
|
||||||
if lockID != nil {
|
if lockID != nil {
|
||||||
t.Error("more than one lock found")
|
t.Error("more than one lock found")
|
||||||
}
|
}
|
||||||
@ -265,27 +266,59 @@ func TestLockRefresh(t *testing.T) {
|
|||||||
if err != nil {
|
if err != nil {
|
||||||
t.Fatal(err)
|
t.Fatal(err)
|
||||||
}
|
}
|
||||||
|
if lockID == nil {
|
||||||
|
t.Fatal("no lock found")
|
||||||
|
}
|
||||||
|
return *lockID
|
||||||
|
}
|
||||||
|
|
||||||
|
func testLockRefresh(t *testing.T, refresh func(lock *restic.Lock) error) {
|
||||||
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
|
lock, err := restic.NewLock(context.TODO(), repo)
|
||||||
|
rtest.OK(t, err)
|
||||||
|
time0 := lock.Time
|
||||||
|
|
||||||
|
lockID := checkSingleLock(t, repo)
|
||||||
|
|
||||||
time.Sleep(time.Millisecond)
|
time.Sleep(time.Millisecond)
|
||||||
rtest.OK(t, lock.Refresh(context.TODO()))
|
rtest.OK(t, refresh(lock))
|
||||||
|
|
||||||
var lockID2 *restic.ID
|
lockID2 := checkSingleLock(t, repo)
|
||||||
err = repo.List(context.TODO(), restic.LockFile, func(id restic.ID, size int64) error {
|
|
||||||
if lockID2 != nil {
|
|
||||||
t.Error("more than one lock found")
|
|
||||||
}
|
|
||||||
lockID2 = &id
|
|
||||||
return nil
|
|
||||||
})
|
|
||||||
if err != nil {
|
|
||||||
t.Fatal(err)
|
|
||||||
}
|
|
||||||
|
|
||||||
rtest.Assert(t, !lockID.Equal(*lockID2),
|
rtest.Assert(t, !lockID.Equal(lockID2),
|
||||||
"expected a new ID after lock refresh, got the same")
|
"expected a new ID after lock refresh, got the same")
|
||||||
lock2, err := restic.LoadLock(context.TODO(), repo, *lockID2)
|
lock2, err := restic.LoadLock(context.TODO(), repo, lockID2)
|
||||||
rtest.OK(t, err)
|
rtest.OK(t, err)
|
||||||
rtest.Assert(t, lock2.Time.After(time0),
|
rtest.Assert(t, lock2.Time.After(time0),
|
||||||
"expected a later timestamp after lock refresh")
|
"expected a later timestamp after lock refresh")
|
||||||
rtest.OK(t, lock.Unlock())
|
rtest.OK(t, lock.Unlock())
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func TestLockRefresh(t *testing.T) {
|
||||||
|
testLockRefresh(t, func(lock *restic.Lock) error {
|
||||||
|
return lock.Refresh(context.TODO())
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestLockRefreshStale(t *testing.T) {
|
||||||
|
testLockRefresh(t, func(lock *restic.Lock) error {
|
||||||
|
return lock.RefreshStaleLock(context.TODO())
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestLockRefreshStaleMissing(t *testing.T) {
|
||||||
|
repo := repository.TestRepository(t)
|
||||||
|
restic.TestSetLockTimeout(t, 5*time.Millisecond)
|
||||||
|
|
||||||
|
lock, err := restic.NewLock(context.TODO(), repo)
|
||||||
|
rtest.OK(t, err)
|
||||||
|
lockID := checkSingleLock(t, repo)
|
||||||
|
|
||||||
|
// refresh must fail if lock was removed
|
||||||
|
rtest.OK(t, repo.Backend().Remove(context.TODO(), restic.Handle{Type: restic.LockFile, Name: lockID.String()}))
|
||||||
|
time.Sleep(time.Millisecond)
|
||||||
|
err = lock.RefreshStaleLock(context.TODO())
|
||||||
|
rtest.Assert(t, err == restic.ErrRemovedLock, "unexpected error, expected %v, got %v", restic.ErrRemovedLock, err)
|
||||||
|
}
|
||||||
|
Loading…
Reference in New Issue
Block a user