Distributed lock for calendar callbacks by getvictor · Pull Request #20252 · fleetdm/fleet

getvictor · 2024-07-08T16:29:10Z

#19352
Adding distributed lock for Google calendar callback.

Checklist for submitter

If some of the following don't apply, delete the relevant line.

Added/updated tests
Manual QA for all new/changed functionality

getvictor · 2024-07-08T20:39:53Z

 		if fleet.IsNotFound(err) {
 			// We could try to stop the channel callbacks here, but that may not be secure since we don't know if the request is legitimate
-			level.Warn(svc.logger).Log("msg", "Received calendar callback, but did not find corresponding event in database", "event_uuid",
+			level.Info(svc.logger).Log("msg", "Received calendar callback, but did not find corresponding event in database", "event_uuid",


This may occur when a calendar event is created, and another change to the calendar occurs at the same time, triggering a callback. The callback comes in before we saved the event in the DB (or before it replicated to the replica). This is OK since we don't expect the event to be immediately modified upon creation.

lukeheath · 2024-07-08T21:33:42Z

@getvictor I'm trying out the PR review bot on this.

greptile-apps

PR Summary

Introduced distributed lock mechanism for Google calendar callbacks (cmd/fleet/serve.go, ee/server/service/calendar.go, server/cron/calendar_cron.go)
Added distributedLock field to Service struct and updated initialization (ee/server/service/service.go)
Implemented Redis-based distributed lock (server/service/redis_lock/redis_lock.go, server/service/redis_lock/redis_lock_test.go)
Updated tests to include distributed lock functionality (ee/server/service/mdm_external_test.go, server/cron/calendar_cron_test.go)
Modified utility functions to support distributed lock (server/service/testing_utils.go)

_{14 file(s) reviewed, 50 comment(s)}
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greptile-apps · 2024-07-08T21:33:58Z

@@ -50,6 +50,7 @@ import (
 	"github.com/fleetdm/fleet/v4/server/pubsub"


ℹ️ info: Imported the redis_lock package to support distributed locking.

greptile-apps · 2024-07-08T21:33:58Z

@@ -691,6 +692,7 @@ the way that the Fleet server works.
 			}


ℹ️ info: Initialized a distributedLock variable to hold the lock instance.

greptile-apps · 2024-07-08T21:33:59Z

@@ -718,6 +720,7 @@ the way that the Fleet server works.
 					}


ℹ️ info: Created a new distributed lock using redis_lock.NewLock(redisPool).

greptile-apps · 2024-07-08T21:34:00Z

@@ -730,6 +733,7 @@ the way that the Fleet server works.
 					ssoSessionStore,


ℹ️ info: Passed the distributedLock to the eeservice.NewService function.

greptile-apps · 2024-07-08T21:34:00Z

@@ -870,7 +874,7 @@ the way that the Fleet server works.
 						} else {


ℹ️ info: Updated the calendar schedule to use the distributedLock.

greptile-apps · 2024-07-08T21:38:40Z

+				foundNewEvents := false
 				for _, item := range list.(*calendar.Events).Items {
+					created, err := time.Parse(time.RFC3339, item.Created)
+					if err != nil {
+						log.Fatalf("Unable to parse event created time: %v", err)
+					}
+					if created.After(now) {
+						// Found events created after we started deleting events, so we should stop
+						foundNewEvents = true
+						continue // Skip this event but finish the loop to make sure we don't miss something
+					}


ℹ️ info: Added logic to check if an event was created after the script started running and skip its deletion.

greptile-apps · 2024-07-08T21:38:41Z

+				pageToken = list.(*calendar.Events).NextPageToken
+				if pageToken == "" || foundNewEvents {
+					break
+				}


ℹ️ info: Handled NextPageToken to continue pagination until all events are processed or new events are found.

greptile-apps · 2024-07-08T21:39:00Z


 			numberMoved := 0
+			var maxResults int64 = 1000
+			pageToken := ""


ℹ️ info: Added pageToken to handle pagination for large sets of events.

greptile-apps · 2024-07-08T21:39:01Z

+				foundNewEvents := false
 				for _, item := range list.(*calendar.Events).Items {
+					created, err := time.Parse(time.RFC3339, item.Created)
+					if err != nil {
+						log.Fatalf("Unable to parse event created time: %v", err)
+					}
+					if created.After(now) {
+						// Found events created after we started moving events, so we should stop
+						foundNewEvents = true
+						continue // Skip this event but finish the loop to make sure we don't miss something
+					}


ℹ️ info: Added logic to skip events created after the script started running to avoid moving new events.

greptile-apps · 2024-07-08T21:39:02Z

+				pageToken = list.(*calendar.Events).NextPageToken
+				if pageToken == "" || foundNewEvents {
+					break


ℹ️ info: Ensure pageToken is updated and check for new events to decide when to break the loop.

greptile-apps

PR Summary

(updates since last review)

Integrated distributed lock mechanism for calendar callbacks in server/cron/calendar_cron.go
Ensured lock acquisition and release around calendar event processing
Updated cron job functions to handle lock reservation and event updates

_{1 file(s) reviewed, 3 comment(s)}
_{Edit PR Review Bot Settings}

greptile-apps · 2024-07-08T21:58:25Z

 	logger kitlog.Logger,
 ) error {
+
+	// Try to acquire the lock. Lock is needed to ensure calendar callback is not processed for this event at the same time.


ℹ️ info: Acquiring the lock to ensure calendar callback is not processed concurrently.

greptile-apps · 2024-07-08T21:58:25Z

+
+	// Remove event from the queue so that we don't process this event again.
+	// Note: This item can be added back to the queue while we are processing it.
+	err = distributedLock.RemoveFromSet(ctx, calendar.QueueKey, eventUUID)


ℹ️ info: Removing event from the queue to prevent reprocessing.

greptile-apps · 2024-07-08T21:58:26Z

+			return errors.New("could not acquire calendar lock in time")
+		}
+	}
+	defer func() {


ℹ️ info: Ensure locks are released after processing to avoid deadlocks.

lukeheath · 2024-07-08T23:19:22Z

Bot is chatty. Should I disable the "info" comments?

greptile-apps

PR Summary

(updates since last review)

Introduced distributed lock mechanism for Google Calendar callbacks in ee/server/service/calendar.go
Ensured lock acquisition and release around event processing
Added events to a queue if the lock is reserved
Enabled asynchronous processing of events when needed

No major changes found since last review.

_{1 file(s) reviewed, 6 comment(s)}
_{Edit PR Review Bot Settings}

greptile-apps · 2024-07-09T12:10:36Z

+	lockValue, reserved, err := svc.getCalendarLock(ctx, eventUUID, true)
+	if err != nil {
+		return err
+	}
+	// If lock has been reserved by cron, we will need to re-process this event in case the calendar event was changed after the cron job read it.
+	if lockValue == "" && !reserved {
+		// We did not get a lock, so there is nothing to do here
+		return nil


ℹ️ info: Ensures that if the lock is reserved, the event will be re-processed to handle any changes made after the cron job read it.

greptile-apps · 2024-07-09T12:10:36Z

+		// Remove event from the queue so that we don't process this event again.
+		// Note: This item can be added back to the queue while we are processing it.
+		err = svc.distributedLock.RemoveFromSet(ctx, calendar.QueueKey, eventUUID)
+		if err != nil {
+			return ctxerr.Wrap(ctx, err, "remove calendar event from queue")
+		}


ℹ️ info: Removes the event from the queue to prevent re-processing while it is being handled.

greptile-apps · 2024-07-09T12:10:37Z

+func (svc *Service) releaseCalendarLock(ctx context.Context, eventUUID string, lockValue string) {
+	ok, err := svc.distributedLock.ReleaseLock(ctx, calendar.LockKeyPrefix+eventUUID, lockValue)
+	if err != nil {
+		level.Error(svc.logger).Log("msg", "Failed to release calendar lock", "err", err)
+	}
+	if !ok {
+		// If the lock was not released, it will expire on its own.
+		level.Warn(svc.logger).Log("msg", "Failed to release calendar lock")
+	}


ℹ️ info: Releases the distributed lock and handles potential errors.

greptile-apps · 2024-07-09T12:10:38Z

+func (svc *Service) getCalendarLock(ctx context.Context, eventUUID string, addToQueue bool) (lockValue string, reserved bool, err error) {
+	// Check if lock has been reserved, which means we can't have it.
+	reservedValue, err := svc.distributedLock.Get(ctx, calendar.ReservedLockKeyPrefix+eventUUID)
+	if err != nil {
+		return "", false, ctxerr.Wrap(ctx, err, "get calendar reserved lock")
+	}
+	reserved = reservedValue != nil
+	if reserved && !addToQueue {
+		// We flag the lock as reserved.
+		return "", reserved, nil
+	}


ℹ️ info: Acquires the distributed lock and adds the event to the queue if the lock is not available.

greptile-apps · 2024-07-09T12:10:39Z

+func (svc *Service) processCalendarAsync(ctx context.Context, eventIDs []string) {
+	defer func() {
+		asyncMutex.Lock()
+		asyncCalendarProcessing = false
+		asyncMutex.Unlock()
+	}()


ℹ️ info: Processes calendar events asynchronously from the queue.

greptile-apps · 2024-07-09T12:10:39Z

+func (svc *Service) processCalendarEventAsync(ctx context.Context, eventUUID string) bool {
+	lockValue, _, err := svc.getCalendarLock(ctx, eventUUID, false)
+	if err != nil {
+		level.Error(svc.logger).Log("msg", "Failed to get calendar lock", "err", err)
+		return false
+	}
+	if lockValue == "" {
+		// We did not get a lock, so there is nothing to do here
+		return true
+	}
+	defer svc.releaseCalendarLock(ctx, eventUUID, lockValue)


ℹ️ info: Processes individual calendar events asynchronously, ensuring locks are managed correctly.

greptile-apps

PR Summary

(updates since last review)

Introduced distributed lock mechanism in server/cron/calendar_cron.go
Acquired and released locks around calendar event processing
Handled lock acquisition timeouts
Ensured events are not reprocessed
Prevented race conditions and ensured data consistency

_{1 file(s) reviewed, 1 comment(s)}
_{Edit PR Review Bot Settings}

greptile-apps · 2024-07-09T12:53:09Z

+		case <-done:
+			// Lock was acquired.
+			if err != nil {
+				return fmt.Errorf("try to acquire calendar lock: %w", err)
+			}


🧠 logic: Ensure that err is properly checked before returning it to avoid potential nil pointer dereference.

lucasmrod · 2024-07-09T14:40:39Z

+			level.Info(svc.logger).Log("msg", "Received calendar callback, but did not find corresponding event in database", "event_uuid",
 				eventUUID, "channel_id", channelID)
-			return err
+			return nil


Return nil so that we don't get retries?

This seems to happen often for legitimate reasons that it doesn't make sense to flag it as error. Google calendar doesn't seem to retry on error. Just don't want the load balancer to see a bunch of 4XX errors and customers start complaining about it.

greptile-apps

PR Summary

(updates since last review)

Introduced Lock interface in /server/fleet/calendar.go for distributed lock management
Renamed parameter name to key in /server/service/redis_lock/redis_lock.go for consistency
Ensured synchronized operations for Google Calendar callbacks across distributed systems

_{2 file(s) reviewed, 4 comment(s)}
_{Edit PR Review Bot Settings}

greptile-apps · 2024-07-09T15:41:27Z

+type Lock interface {
+	// AcquireLock attempts to acquire a lock with the given key. value is the value to set for the key, which is used to release the lock.
+	AcquireLock(ctx context.Context, key string, value string, expireMs uint64) (result string, err error)
+	// ReleaseLock attempts to release a lock with the given key and value. If key does not exist or value does not match, the lock is not released.
+	ReleaseLock(ctx context.Context, key string, value string) (ok bool, err error)
+	// Get retrieves the value of the given key. If the key does not exist, nil is returned.
+	Get(ctx context.Context, key string) (*string, error)
+	// AddToSet adds the value to the set identified by the given key.
+	AddToSet(ctx context.Context, key string, value string) error
+	// RemoveFromSet removes the value from the set identified by the given key.
+	RemoveFromSet(ctx context.Context, key string, value string) error
+	// GetSet retrieves a slice of string values from the set identified by the given key.
+	GetSet(ctx context.Context, key string) ([]string, error)


ℹ️ info: Introduced a new Lock interface for managing distributed locks, which includes methods for acquiring, releasing, and managing locks and sets.

greptile-apps · 2024-07-09T15:41:52Z

+	return fleet.Lock(lock)
+}
+
+func (r *redisLock) AcquireLock(ctx context.Context, key string, value string, expireMs uint64) (result string, err error) {


ℹ️ info: Renamed parameter name to key for consistency.

greptile-apps · 2024-07-09T15:41:53Z

+	return result, nil
+}
+
+func (r *redisLock) ReleaseLock(ctx context.Context, key string, value string) (ok bool, err error) {


ℹ️ info: Renamed parameter name to key for consistency.

greptile-apps · 2024-07-09T15:41:54Z

+	return members, nil
+}
+
+func (r *redisLock) Get(ctx context.Context, key string) (*string, error) {


ℹ️ info: Renamed parameter name to key for consistency.

lukeheath · 2024-07-09T16:46:42Z

Sorry for all the noise in the PR. I'm removing the bot review and will try to disable the "info" comments in the future.

lucasmrod

LGTM!

Left a couple of questions.

lucasmrod · 2024-07-09T19:54:02Z

+	// If lock has been reserved by cron, we will need to re-process this event in case the calendar event was changed after the cron job read it.
+	if lockValue == "" && !reserved {
+		// We did not get a lock, so there is nothing to do here
+		return nil


What's this scenario? Should we log here?

This is when our server could not get a lock (because another server has the lock). In the svc.getCalendarLock method, we added this event to the queue. So, the other server will re-process this event.

I could add a debug log here, but this might happen often in production.

lucasmrod · 2024-07-09T20:15:18Z

+		// Try to acquire the lock again in case it was released while we were adding the event to the queue.
+		result, err = svc.distributedLock.AcquireLock(ctx, calendar.LockKeyPrefix+eventUUID, lockValue, 0)
+		if err != nil {
+			return "", false, ctxerr.Wrap(ctx, err, "acquire calendar lock again")
+		}
+
+		if result == "" {
+			// We could not acquire the lock, so we are done here.
+			return "", reserved, nil
+		}


Is this optimization necessary?

Yes, it catches the corner case where an event UUID was added to the queue, but no server actually processes the queue because all the locks have been released.

lucasmrod · 2024-07-09T20:16:34Z

+// Lock interface for managing distributed locks.
+type Lock interface {
+	// AcquireLock attempts to acquire a lock with the given key. value is the value to set for the key, which is used to release the lock.
+	AcquireLock(ctx context.Context, key string, value string, expireMs uint64) (result string, err error)


Let's document what is expireMs and what does expireMs = 0 mean.

ok, will add on the UUID branch

lucasmrod · 2024-07-09T20:19:20Z

+	// Now, we need to check if there are any events in the queue that need to be re-processed.
+	asyncMutex.Lock()
+	defer asyncMutex.Unlock()
+	if !asyncCalendarProcessing {
+		eventIDs, err := svc.distributedLock.GetSet(ctx, calendar.QueueKey)
+		if err != nil {
+			return ctxerr.Wrap(ctx, err, "get calendar event queue")
+		}
+		if len(eventIDs) > 0 {
+			asyncCalendarProcessing = true
+			go svc.processCalendarAsync(ctx, eventIDs)
+		}
+		return nil
+	}


Any issues with two Fleet instances running this async simultaneously and/or a Fleet instance running the cron simultaneously?

It should work with multiple instances running it. They loop through the UUIDs and try to get a lock. If they don't get a lock, they try a different UUID. The load test should cover this.

lucasmrod · 2024-07-09T20:29:50Z

+	if err != nil {
+		if fleet.IsNotFound(err) {
+			// We found this event when the callback initially came in. So the event may have been removed from DB since then.
+			return true


Is this an issue? (Maybe processCalendarEventAsync should return an error?)

This happens frequently because we create a new UUID when re-creating the event. The old UUID stuck in the queue will hit this. I'll update the comment to:

So the event may have been removed or re-created since then.

lucasmrod · 2024-07-09T21:01:47Z

+	// AcquireLock attempts to acquire a lock with the given key. value is the value to set for the key, which is used to release the lock.
+	AcquireLock(ctx context.Context, key string, value string, expireMs uint64) (result string, err error)
+	// ReleaseLock attempts to release a lock with the given key and value. If key does not exist or value does not match, the lock is not released.
+	ReleaseLock(ctx context.Context, key string, value string) (ok bool, err error)


@@document that returns true if it was released, false otherwise (e.g. when value doesn't match).

lucasmrod · 2024-07-09T21:06:37Z

+
+	// Reference: https://redis.io/docs/latest/commands/sadd/
+	_, err := conn.Do("SADD", r.testPrefix+key, value)
+	if err != nil {


Double checking: do you need to check errors.Is(err, redigo.ErrNil) here?

No, redigo.ErrNil is only created when you use certain helper methods like redigo.String

lucasmrod · 2024-07-09T21:06:49Z

+
+	// Reference: https://redis.io/docs/latest/commands/srem/
+	_, err := conn.Do("SREM", r.testPrefix+key, value)
+	if err != nil {


Double checking: do you need to check errors.Is(err, redigo.ErrNil) here?

No, see above.

lucasmrod · 2024-07-09T21:07:02Z

+
+	// Reference: https://redis.io/docs/latest/commands/smembers/
+	members, err := redigo.Strings(conn.Do("SMEMBERS", r.testPrefix+key))
+	if err != nil {


Double checking: do you need to check errors.Is(err, redigo.ErrNil) here?

Yes, it is not documented, but I see the implementation can generate an ErrNil. I will add.

lucasmrod · 2024-07-09T21:17:03Z

+// Lock interface for managing distributed locks.
+type Lock interface {
+	// AcquireLock attempts to acquire a lock with the given key. value is the value to set for the key, which is used to release the lock.
+	AcquireLock(ctx context.Context, key string, value string, expireMs uint64) (result string, err error)


Why is the result a string?

Yes, it looks like it should be bool. I'll work on it.

…20277) #19352 Fix for code review comment: #20156 (comment) Also includes changes from #20252 # Checklist for submitter If some of the following don't apply, delete the relevant line.  - [x] Added/updated tests - [x] If database migrations are included, checked table schema to confirm autoupdate - For database migrations: - [x] Checked schema for all modified table for columns that will auto-update timestamps during migration. - [x] Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects. - [x] Ensured the correct collation is explicitly set for character columns (`COLLATE utf8mb4_unicode_ci`). - [x] Manual QA for all new/changed functionality

…20277) #19352 Fix for code review comment: #20156 (comment) Also includes changes from #20252 # Checklist for submitter If some of the following don't apply, delete the relevant line.  - [x] Added/updated tests - [x] If database migrations are included, checked table schema to confirm autoupdate - For database migrations: - [x] Checked schema for all modified table for columns that will auto-update timestamps during migration. - [x] Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects. - [x] Ensured the correct collation is explicitly set for character columns (`COLLATE utf8mb4_unicode_ci`). - [x] Manual QA for all new/changed functionality (cherry picked from commit 7bcd61a)

getvictor · 2024-07-10T14:02:18Z

This PR has been superseded by #20277

getvictor added 3 commits July 8, 2024 10:28

Initial work on distributed lock.

63a4975

Service lock implementation done.

483dd23

Fixed compile issues.

77044f7

getvictor temporarily deployed to Docker Hub July 8, 2024 16:29 — with GitHub Actions Inactive

Fixing null pointer in test.

2a81f63

getvictor temporarily deployed to Docker Hub July 8, 2024 18:32 — with GitHub Actions Inactive

Minor updates after manual testing.

f842743

getvictor temporarily deployed to Docker Hub July 8, 2024 20:02 — with GitHub Actions Inactive

Fix test

ace15ab

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getvictor commented Jul 8, 2024

View reviewed changes

Refactored redis implementation.

472fc47

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getvictor marked this pull request as ready for review July 8, 2024 21:19

getvictor requested review from a team, gillespi314, lucasmrod and roperzh as code owners July 8, 2024 21:19

getvictor assigned lucasmrod Jul 8, 2024

lukeheath added the :ai Request AI PR review label Jul 8, 2024

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Fixed minor lock-related bug in cron job.

38562ac

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Fix bug found with WIP unit test.

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Fix another bug found with WIP unit test.

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Comment thread server/fleet/calendar.go Outdated

Added integration test and updated Lock interface documentation.

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getvictor mentioned this pull request Jul 9, 2024

Distributed lock and store calendar_events UUID as binary in MySQL #20277

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getvictor closed this Jul 10, 2024

getvictor deleted the victor/19352-distributed-lock-2 branch May 8, 2025 22:22

		@@ -50,6 +50,7 @@ import (
		"github.com/fleetdm/fleet/v4/server/pubsub"

		@@ -730,6 +733,7 @@ the way that the Fleet server works.
		ssoSessionStore,

		@@ -870,7 +874,7 @@ the way that the Fleet server works.
		} else {

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getvictor commented Jul 8, 2024 •

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