clitools
/
restic
mirror of https://github.com/restic/restic.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Merge pull request #4374 from MichaelEischer/try-refresh-stale-locks 

Try to refresh stale locks
This commit is contained in:
Michael Eischer 2023-07-22 23:50:52 +02:00 committed by GitHub
parent 60d8066568 3f63b53090
commit bdaec8fdb8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 433 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
changelog/unreleased/issue-4274 Normal file
View File

@ -0,0 +1,10 @@
Bugfix: Improve lock refresh handling when using standby
If the restic process was stopped or the host running restic entered standby
during a long running operation such as a backup, this resulted in the
operation failing with `Fatal: failed to refresh lock in time`. We've reworked
the lock refresh such that restic first checks whether it is safe to continue
the current operation and only throws an error if not.
https://github.com/restic/restic/issues/4274
https://github.com/restic/restic/pull/4374

11
cmd/restic/cmd_backup.go
View File

@ -506,10 +506,13 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
if !gopts.JSON {
progressPrinter.V("lock repository")
}
lock, ctx, err := lockRepo(ctx, repo, gopts.RetryLock, gopts.JSON)
defer unlockRepo(lock)
if err != nil {
return err
if !opts.DryRun {
var lock *restic.Lock
lock, ctx, err = lockRepo(ctx, repo, gopts.RetryLock, gopts.JSON)
defer unlockRepo(lock)
if err != nil {
return err
}
}
// rejectByNameFuncs collect functions that can reject items from the backup based on path only

88
cmd/restic/lock.go
View File

@ -12,6 +12,7 @@ import (
)
type lockContext struct {
lock *restic.Lock
cancel context.CancelFunc
refreshWG sync.WaitGroup
}
@ -104,15 +105,17 @@ retryLoop:
ctx, cancel := context.WithCancel(ctx)
lockInfo := &lockContext{
lock: lock,
cancel: cancel,
}
lockInfo.refreshWG.Add(2)
refreshChan := make(chan struct{})
forceRefreshChan := make(chan refreshLockRequest)
globalLocks.Lock()
globalLocks.locks[lock] = lockInfo
go refreshLocks(ctx, lock, lockInfo, refreshChan)
go monitorLockRefresh(ctx, lockInfo, refreshChan)
go refreshLocks(ctx, repo.Backend(), lockInfo, refreshChan, forceRefreshChan)
go monitorLockRefresh(ctx, lockInfo, refreshChan, forceRefreshChan)
globalLocks.Unlock()
return lock, ctx, err
@ -124,8 +127,13 @@ var refreshInterval = 5 * time.Minute
// the difference allows to compensate for a small time drift between clients.
var refreshabilityTimeout = restic.StaleLockTimeout - refreshInterval*3/2
func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext, refreshed chan<- struct{}) {
type refreshLockRequest struct {
result chan bool
}
func refreshLocks(ctx context.Context, backend restic.Backend, lockInfo *lockContext, refreshed chan<- struct{}, forceRefresh <-chan refreshLockRequest) {
debug.Log("start")
lock := lockInfo.lock
ticker := time.NewTicker(refreshInterval)
lastRefresh := lock.Time
@ -149,6 +157,22 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
case <-ctx.Done():
debug.Log("terminate")
return
case req := <-forceRefresh:
debug.Log("trying to refresh stale lock")
// keep on going if our current lock still exists
success := tryRefreshStaleLock(ctx, backend, lock, lockInfo.cancel)
// inform refresh goroutine about forced refresh
select {
case <-ctx.Done():
case req.result <- success:
}
if success {
// update lock refresh time
lastRefresh = lock.Time
}
case <-ticker.C:
if time.Since(lastRefresh) > refreshabilityTimeout {
// the lock is too old, wait until the expiry monitor cancels the context
@ -161,7 +185,7 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
Warnf("unable to refresh lock: %v\n", err)
} else {
lastRefresh = lock.Time
// inform monitor gorountine about successful refresh
// inform monitor goroutine about successful refresh
select {
case <-ctx.Done():
case refreshed <- struct{}{}:
@ -171,7 +195,7 @@ func refreshLocks(ctx context.Context, lock *restic.Lock, lockInfo *lockContext,
}
}
func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-chan struct{}) {
func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-chan struct{}, forceRefresh chan<- refreshLockRequest) {
// time.Now() might use a monotonic timer which is paused during standby
// convert to unix time to ensure we compare real time values
lastRefresh := time.Now().UnixNano()
@ -183,24 +207,47 @@ func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-
// timers are paused during standby, which is a problem as the refresh timeout
// _must_ expire if the host was too long in standby. Thus fall back to periodic checks
// https://github.com/golang/go/issues/35012
timer := time.NewTimer(pollDuration)
ticker := time.NewTicker(pollDuration)
defer func() {
timer.Stop()
ticker.Stop()
lockInfo.cancel()
lockInfo.refreshWG.Done()
}()
var refreshStaleLockResult chan bool
for {
select {
case <-ctx.Done():
debug.Log("terminate expiry monitoring")
return
case <-refreshed:
if refreshStaleLockResult != nil {
// ignore delayed refresh notifications while the stale lock is refreshed
continue
}
lastRefresh = time.Now().UnixNano()
case <-timer.C:
if time.Now().UnixNano()-lastRefresh < refreshabilityTimeout.Nanoseconds() {
// restart timer
timer.Reset(pollDuration)
case <-ticker.C:
if time.Now().UnixNano()-lastRefresh < refreshabilityTimeout.Nanoseconds() || refreshStaleLockResult != nil {
continue
}
debug.Log("trying to refreshStaleLock")
// keep on going if our current lock still exists
refreshReq := refreshLockRequest{
result: make(chan bool),
}
refreshStaleLockResult = refreshReq.result
// inform refresh goroutine about forced refresh
select {
case <-ctx.Done():
case forceRefresh <- refreshReq:
}
case success := <-refreshStaleLockResult:
if success {
lastRefresh = time.Now().UnixNano()
refreshStaleLockResult = nil
continue
}
@ -210,6 +257,25 @@ func monitorLockRefresh(ctx context.Context, lockInfo *lockContext, refreshed <-
}
}
func tryRefreshStaleLock(ctx context.Context, backend restic.Backend, lock *restic.Lock, cancel context.CancelFunc) bool {
freeze := restic.AsBackend[restic.FreezeBackend](backend)
if freeze != nil {
debug.Log("freezing backend")
freeze.Freeze()
defer freeze.Unfreeze()
}
err := lock.RefreshStaleLock(ctx)
if err != nil {
Warnf("failed to refresh stale lock: %v\n", err)
// cancel context while the backend is still frozen to prevent accidental modifications
cancel()
return false
}
return true
}
func unlockRepo(lock *restic.Lock) {
if lock == nil {
return

98
cmd/restic/lock_test.go
View File

@ -5,16 +5,26 @@ import (
"fmt"
"runtime"
"strings"
"sync"
"testing"
"time"
"github.com/restic/restic/internal/backend/location"
"github.com/restic/restic/internal/backend/mem"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/repository"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/test"
)
func openTestRepo(t *testing.T, wrapper backendWrapper) (*repository.Repository, func(), *testEnvironment) {
func openLockTestRepo(t *testing.T, wrapper backendWrapper) (*repository.Repository, func(), *testEnvironment) {
env, cleanup := withTestEnvironment(t)
reg := location.NewRegistry()
reg.Register(mem.NewFactory())
env.gopts.backends = reg
env.gopts.Repo = "mem:"
if wrapper != nil {
env.gopts.backendTestHook = wrapper
}
@ -36,7 +46,7 @@ func checkedLockRepo(ctx context.Context, t *testing.T, repo restic.Repository,
}
func TestLock(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
@ -47,7 +57,7 @@ func TestLock(t *testing.T) {
}
func TestLockCancel(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
ctx, cancel := context.WithCancel(context.Background())
@ -63,7 +73,7 @@ func TestLockCancel(t *testing.T) {
}
func TestLockUnlockAll(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
lock, wrappedCtx := checkedLockRepo(context.Background(), t, repo, env)
@ -78,7 +88,7 @@ func TestLockUnlockAll(t *testing.T) {
}
func TestLockConflict(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
repo2, err := OpenRepository(context.TODO(), env.gopts)
test.OK(t, err)
@ -107,7 +117,7 @@ func (b *writeOnceBackend) Save(ctx context.Context, h restic.Handle, rd restic.
}
func TestLockFailedRefresh(t *testing.T) {
repo, cleanup, env := openTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
repo, cleanup, env := openLockTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
return &writeOnceBackend{Backend: r}, nil
})
defer cleanup()
@ -145,7 +155,7 @@ func (b *loggingBackend) Save(ctx context.Context, h restic.Handle, rd restic.Re
}
func TestLockSuccessfulRefresh(t *testing.T) {
repo, cleanup, env := openTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
repo, cleanup, env := openLockTestRepo(t, func(r restic.Backend) (restic.Backend, error) {
return &loggingBackend{
Backend: r,
t: t,
@ -182,8 +192,71 @@ func TestLockSuccessfulRefresh(t *testing.T) {
unlockRepo(lock)
}
type slowBackend struct {
restic.Backend
m sync.Mutex
sleep time.Duration
}
func (b *slowBackend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
b.m.Lock()
sleep := b.sleep
b.m.Unlock()
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) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
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, elock.Unlock())
}
func TestLockWaitCancel(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
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
cancelAfter := 40 * time.Millisecond
start := time.Now()
ctx, cancel := context.WithCancel(context.TODO())
time.AfterFunc(cancelAfter, cancel)
start := time.Now()
lock, _, err := lockRepo(ctx, repo, retryLock, env.gopts.JSON)
duration := time.Since(start)
@ -227,14 +301,14 @@ func TestLockWaitCancel(t *testing.T) {
test.Assert(t, strings.Contains(err.Error(), "context canceled"),
"create normal lock with exclusively locked repo didn't return the correct error")
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, elock.Unlock())
}
func TestLockWaitSuccess(t *testing.T) {
repo, cleanup, env := openTestRepo(t, nil)
repo, cleanup, env := openLockTestRepo(t, nil)
defer cleanup()
elock, _, err := lockRepoExclusive(context.TODO(), repo, env.gopts.RetryLock, env.gopts.JSON)

34
internal/backend/sema/backend.go
View File

@ -3,6 +3,7 @@ package sema
import (
"context"
"io"
"sync"
"github.com/cenkalti/backoff/v4"
"github.com/restic/restic/internal/errors"
@ -15,7 +16,8 @@ var _ restic.Backend = &connectionLimitedBackend{}
// connectionLimitedBackend limits the number of concurrent operations.
type connectionLimitedBackend struct {
restic.Backend
sem semaphore
sem semaphore
freezeLock sync.Mutex
}
// 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() {}
}
be.sem.GetToken()
// prevent token usage while the backend is frozen
be.freezeLock.Lock()
defer be.freezeLock.Unlock()
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.
func (be *connectionLimitedBackend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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)()
if ctx.Err() != nil {
return ctx.Err()
}
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)()
if ctx.Err() != nil {
return ctx.Err()
}
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)()
if ctx.Err() != nil {
return restic.FileInfo{}, ctx.Err()
}
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)()
if ctx.Err() != nil {
return ctx.Err()
}
return be.Backend.Remove(ctx, h)
}

36
internal/backend/sema/backend_test.go
View File

@ -3,6 +3,7 @@ package sema_test
import (
"context"
"io"
"sync"
"sync/atomic"
"testing"
"time"
@ -197,3 +198,38 @@ func TestConcurrencyUnlimitedLockSave(t *testing.T) {
}
}, 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
internal/migrations/s3_layout.go
View File

@ -21,26 +21,9 @@ func init() {
// "default" layout.
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.
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 {
debug.Log("backend is not s3")
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.
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 {
debug.Log("backend is not s3")
return errors.New("backend is not s3")

27
internal/migrations/s3_layout_test.go
View File

@ -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")
}

25
internal/restic/backend.go
View File

@ -75,6 +75,31 @@ type BackendUnwrapper interface {
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.
type FileInfo struct {
Size int64

38
internal/restic/backend_test.go Normal file
View 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")
}

64
internal/restic/lock.go
View File

@ -81,6 +81,8 @@ func IsInvalidLock(err error) bool {
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
// exclusive lock is already held by another process, it returns an error
// 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()})
}
// 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 {
l.lock.Lock()
defer l.lock.Unlock()

77
internal/restic/lock_test.go
View File

@ -16,6 +16,7 @@ import (
func TestLock(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
lock, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
@ -25,6 +26,7 @@ func TestLock(t *testing.T) {
func TestDoubleUnlock(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
lock, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
@ -38,6 +40,7 @@ func TestDoubleUnlock(t *testing.T) {
func TestMultipleLock(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
lock1, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
@ -63,6 +66,7 @@ func (be *failLockLoadingBackend) Load(ctx context.Context, h restic.Handle, len
func TestMultipleLockFailure(t *testing.T) {
be := &failLockLoadingBackend{Backend: mem.New()}
repo := repository.TestRepositoryWithBackend(t, be, 0)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
lock1, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
@ -83,6 +87,7 @@ func TestLockExclusive(t *testing.T) {
func TestLockOnExclusiveLockedRepo(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
elock, err := restic.NewExclusiveLock(context.TODO(), repo)
rtest.OK(t, err)
@ -99,6 +104,7 @@ func TestLockOnExclusiveLockedRepo(t *testing.T) {
func TestExclusiveLockOnLockedRepo(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestSetLockTimeout(t, 5*time.Millisecond)
elock, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
@ -247,15 +253,10 @@ func TestRemoveAllLocks(t *testing.T) {
3, processed)
}
func TestLockRefresh(t *testing.T) {
repo := repository.TestRepository(t)
lock, err := restic.NewLock(context.TODO(), repo)
rtest.OK(t, err)
time0 := lock.Time
func checkSingleLock(t *testing.T, repo restic.Repository) restic.ID {
t.Helper()
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 {
t.Error("more than one lock found")
}
@ -265,27 +266,59 @@ func TestLockRefresh(t *testing.T) {
if err != nil {
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)
rtest.OK(t, lock.Refresh(context.TODO()))
rtest.OK(t, refresh(lock))
var lockID2 *restic.ID
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)
}
lockID2 := checkSingleLock(t, repo)
rtest.Assert(t, !lockID.Equal(*lockID2),
rtest.Assert(t, !lockID.Equal(lockID2),
"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.Assert(t, lock2.Time.After(time0),
"expected a later timestamp after lock refresh")
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)
}