Add more sync records + fix small bug in monitoring task causing deletion metrics to never be emitted (#3837)

Double check we don't double-emit + fix pruning metric

Add log

Fix comment

rename

backend/onyx/background/celery/tasks/doc_permission_syncing/tasks.py

@@ -11,6 +11,7 @@ from celery import Task
 from celery.exceptions import SoftTimeLimitExceeded
 from redis import Redis
 from redis.lock import Lock as RedisLock
+from sqlalchemy.orm import Session
 
 from ee.onyx.db.connector_credential_pair import get_all_auto_sync_cc_pairs
 from ee.onyx.db.document import upsert_document_external_perms
@@ -31,12 +32,17 @@ from onyx.configs.constants import OnyxCeleryPriority
 from onyx.configs.constants import OnyxCeleryQueues
 from onyx.configs.constants import OnyxCeleryTask
 from onyx.configs.constants import OnyxRedisLocks
+from onyx.db.connector import mark_cc_pair_as_permissions_synced
 from onyx.db.connector_credential_pair import get_connector_credential_pair_from_id
 from onyx.db.document import upsert_document_by_connector_credential_pair
 from onyx.db.engine import get_session_with_tenant
 from onyx.db.enums import AccessType
 from onyx.db.enums import ConnectorCredentialPairStatus
+from onyx.db.enums import SyncStatus
+from onyx.db.enums import SyncType
 from onyx.db.models import ConnectorCredentialPair
+from onyx.db.sync_record import insert_sync_record
+from onyx.db.sync_record import update_sync_record_status
 from onyx.db.users import batch_add_ext_perm_user_if_not_exists
 from onyx.redis.redis_connector import RedisConnector
 from onyx.redis.redis_connector_doc_perm_sync import (
@@ -57,6 +63,9 @@ LIGHT_SOFT_TIME_LIMIT = 105
 LIGHT_TIME_LIMIT = LIGHT_SOFT_TIME_LIMIT + 15
 
 
+"""Jobs / utils for kicking off doc permissions sync tasks."""
+
+
 def _is_external_doc_permissions_sync_due(cc_pair: ConnectorCredentialPair) -> bool:
     """Returns boolean indicating if external doc permissions sync is due."""
 
@@ -174,6 +183,15 @@ def try_creating_permissions_sync_task(
 
         custom_task_id = f"{redis_connector.permissions.generator_task_key}_{uuid4()}"
 
+        # create before setting fence to avoid race condition where the monitoring
+        # task updates the sync record before it is created
+        with get_session_with_tenant(tenant_id) as db_session:
+            insert_sync_record(
+                db_session=db_session,
+                entity_id=cc_pair_id,
+                sync_type=SyncType.EXTERNAL_PERMISSIONS,
+            )
+
         # set a basic fence to start
         payload = RedisConnectorPermissionSyncPayload(started=None, celery_task_id=None)
         redis_connector.permissions.set_fence(payload)
@@ -400,3 +418,53 @@ def update_external_document_permissions_task(
             f"Error Syncing Document Permissions: connector_id={connector_id} doc_id={doc_id}"
         )
         return False
+
+
+"""Monitoring CCPair permissions utils, called in monitor_vespa_sync"""
+
+
+def monitor_ccpair_permissions_taskset(
+    tenant_id: str | None, key_bytes: bytes, r: Redis, db_session: Session
+) -> None:
+    fence_key = key_bytes.decode("utf-8")
+    cc_pair_id_str = RedisConnector.get_id_from_fence_key(fence_key)
+    if cc_pair_id_str is None:
+        task_logger.warning(
+            f"monitor_ccpair_permissions_taskset: could not parse cc_pair_id from {fence_key}"
+        )
+        return
+
+    cc_pair_id = int(cc_pair_id_str)
+
+    redis_connector = RedisConnector(tenant_id, cc_pair_id)
+    if not redis_connector.permissions.fenced:
+        return
+
+    initial = redis_connector.permissions.generator_complete
+    if initial is None:
+        return
+
+    remaining = redis_connector.permissions.get_remaining()
+    task_logger.info(
+        f"Permissions sync progress: cc_pair={cc_pair_id} remaining={remaining} initial={initial}"
+    )
+    if remaining > 0:
+        return
+
+    payload: RedisConnectorPermissionSyncPayload | None = (
+        redis_connector.permissions.payload
+    )
+    start_time: datetime | None = payload.started if payload else None
+
+    mark_cc_pair_as_permissions_synced(db_session, int(cc_pair_id), start_time)
+    task_logger.info(f"Successfully synced permissions for cc_pair={cc_pair_id}")
+
+    update_sync_record_status(
+        db_session=db_session,
+        entity_id=cc_pair_id,
+        sync_type=SyncType.EXTERNAL_PERMISSIONS,
+        sync_status=SyncStatus.SUCCESS,
+        num_docs_synced=initial,
+    )
+
+    redis_connector.permissions.reset()

backend/onyx/background/celery/tasks/external_group_syncing/tasks.py

@@ -33,7 +33,11 @@ from onyx.db.connector_credential_pair import get_connector_credential_pair_from
 from onyx.db.engine import get_session_with_tenant
 from onyx.db.enums import AccessType
 from onyx.db.enums import ConnectorCredentialPairStatus
+from onyx.db.enums import SyncStatus
+from onyx.db.enums import SyncType
 from onyx.db.models import ConnectorCredentialPair
+from onyx.db.sync_record import insert_sync_record
+from onyx.db.sync_record import update_sync_record_status
 from onyx.redis.redis_connector import RedisConnector
 from onyx.redis.redis_connector_ext_group_sync import (
     RedisConnectorExternalGroupSyncPayload,
@@ -200,6 +204,15 @@ def try_creating_external_group_sync_task(
             celery_task_id=result.id,
         )
 
+        # create before setting fence to avoid race condition where the monitoring
+        # task updates the sync record before it is created
+        with get_session_with_tenant(tenant_id) as db_session:
+            insert_sync_record(
+                db_session=db_session,
+                entity_id=cc_pair_id,
+                sync_type=SyncType.EXTERNAL_GROUP,
+            )
+
         redis_connector.external_group_sync.set_fence(payload)
 
     except Exception:
@@ -289,11 +302,26 @@ def connector_external_group_sync_generator_task(
             )
 
             mark_cc_pair_as_external_group_synced(db_session, cc_pair.id)
+
+            update_sync_record_status(
+                db_session=db_session,
+                entity_id=cc_pair_id,
+                sync_type=SyncType.EXTERNAL_GROUP,
+                sync_status=SyncStatus.SUCCESS,
+            )
     except Exception as e:
         task_logger.exception(
             f"Failed to run external group sync: cc_pair={cc_pair_id}"
         )
 
+        with get_session_with_tenant(tenant_id) as db_session:
+            update_sync_record_status(
+                db_session=db_session,
+                entity_id=cc_pair_id,
+                sync_type=SyncType.EXTERNAL_GROUP,
+                sync_status=SyncStatus.FAILED,
+            )
+
         redis_connector.external_group_sync.generator_clear()
         redis_connector.external_group_sync.taskset_clear()
         raise e

backend/onyx/background/celery/tasks/monitoring/tasks.py

@@ -58,6 +58,11 @@ _SYNC_START_LATENCY_KEY_FMT = (
     "sync_start_latency:{sync_type}:{entity_id}:{sync_record_id}"
 )
 
+_CONNECTOR_START_TIME_KEY_FMT = "connector_start_time:{cc_pair_id}:{index_attempt_id}"
+_CONNECTOR_END_TIME_KEY_FMT = "connector_end_time:{cc_pair_id}:{index_attempt_id}"
+_SYNC_START_TIME_KEY_FMT = "sync_start_time:{sync_type}:{entity_id}:{sync_record_id}"
+_SYNC_END_TIME_KEY_FMT = "sync_end_time:{sync_type}:{entity_id}:{sync_record_id}"
+
 
 def _mark_metric_as_emitted(redis_std: Redis, key: str) -> None:
     """Mark a metric as having been emitted by setting a Redis key with expiration"""
@@ -303,8 +308,6 @@ def _build_connector_final_metrics(
                 )
             )
 
-        _mark_metric_as_emitted(redis_std, metric_key)
-
     return metrics
 
 
@@ -344,6 +347,52 @@ def _collect_connector_metrics(db_session: Session, redis_std: Redis) -> list[Me
             if one_hour_ago > most_recent_attempt.time_created:
                 continue
 
+            # Build a job_id for correlation
+            job_id = build_job_id(
+                "connector", str(cc_pair.id), str(most_recent_attempt.id)
+            )
+
+            # Add raw start time metric if available
+            if most_recent_attempt.time_started:
+                start_time_key = _CONNECTOR_START_TIME_KEY_FMT.format(
+                    cc_pair_id=cc_pair.id,
+                    index_attempt_id=most_recent_attempt.id,
+                )
+                metrics.append(
+                    Metric(
+                        key=start_time_key,
+                        name="connector_start_time",
+                        value=most_recent_attempt.time_started.timestamp(),
+                        tags={
+                            "job_id": job_id,
+                            "connector_id": str(cc_pair.connector.id),
+                            "source": str(cc_pair.connector.source),
+                        },
+                    )
+                )
+
+            # Add raw end time metric if available and in terminal state
+            if (
+                most_recent_attempt.status.is_terminal()
+                and most_recent_attempt.time_updated
+            ):
+                end_time_key = _CONNECTOR_END_TIME_KEY_FMT.format(
+                    cc_pair_id=cc_pair.id,
+                    index_attempt_id=most_recent_attempt.id,
+                )
+                metrics.append(
+                    Metric(
+                        key=end_time_key,
+                        name="connector_end_time",
+                        value=most_recent_attempt.time_updated.timestamp(),
+                        tags={
+                            "job_id": job_id,
+                            "connector_id": str(cc_pair.connector.id),
+                            "source": str(cc_pair.connector.source),
+                        },
+                    )
+                )
+
             # Connector start latency
             start_latency_metric = _build_connector_start_latency_metric(
                 cc_pair, most_recent_attempt, second_most_recent_attempt, redis_std
@@ -365,9 +414,10 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
     """
     Collect metrics for document set and group syncing:
       - Success/failure status
-      - Start latency (always)
+      - Start latency (for doc sets / user groups)
       - Duration & doc count (only if success)
       - Throughput (docs/min) (only if success)
+      - Raw start/end times for each sync
     """
     one_hour_ago = get_db_current_time(db_session) - timedelta(hours=1)
 
@@ -389,6 +439,43 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
         # Build a job_id for correlation
         job_id = build_job_id("sync_record", str(sync_record.id))
 
+        # Add raw start time metric
+        start_time_key = _SYNC_START_TIME_KEY_FMT.format(
+            sync_type=sync_record.sync_type,
+            entity_id=sync_record.entity_id,
+            sync_record_id=sync_record.id,
+        )
+        metrics.append(
+            Metric(
+                key=start_time_key,
+                name="sync_start_time",
+                value=sync_record.sync_start_time.timestamp(),
+                tags={
+                    "job_id": job_id,
+                    "sync_type": str(sync_record.sync_type),
+                },
+            )
+        )
+
+        # Add raw end time metric if available
+        if sync_record.sync_end_time:
+            end_time_key = _SYNC_END_TIME_KEY_FMT.format(
+                sync_type=sync_record.sync_type,
+                entity_id=sync_record.entity_id,
+                sync_record_id=sync_record.id,
+            )
+            metrics.append(
+                Metric(
+                    key=end_time_key,
+                    name="sync_end_time",
+                    value=sync_record.sync_end_time.timestamp(),
+                    tags={
+                        "job_id": job_id,
+                        "sync_type": str(sync_record.sync_type),
+                    },
+                )
+            )
+
         # Emit a SUCCESS/FAIL boolean metric
         #    Use a single Redis key to avoid re-emitting final metrics
         final_metric_key = _FINAL_METRIC_KEY_FMT.format(
@@ -439,7 +526,7 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
                 if duration_seconds is not None:
                     metrics.append(
                         Metric(
-                            key=None,
+                            key=final_metric_key,
                             name="sync_duration_seconds",
                             value=duration_seconds,
                             tags={
@@ -455,7 +542,7 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
 
                 metrics.append(
                     Metric(
-                        key=None,
+                        key=final_metric_key,
                         name="sync_doc_count",
                         value=doc_count,
                         tags={
@@ -468,7 +555,7 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
                 if sync_speed is not None:
                     metrics.append(
                         Metric(
-                            key=None,
+                            key=final_metric_key,
                             name="sync_speed_docs_per_min",
                             value=sync_speed,
                             tags={
@@ -482,9 +569,6 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
                         f"Invalid sync record {sync_record.id} with no duration"
                     )
 
-            # Mark final metrics as emitted so we don't re-emit
-            _mark_metric_as_emitted(redis_std, final_metric_key)
-
         # Emit start latency
         start_latency_key = _SYNC_START_LATENCY_KEY_FMT.format(
             sync_type=sync_record.sync_type,
@@ -502,22 +586,20 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
                 entity = db_session.scalar(
                     select(UserGroup).where(UserGroup.id == sync_record.entity_id)
                 )
-            else:
-                task_logger.info(
-                    f"Skipping sync record {sync_record.id} of type {sync_record.sync_type}."
-                )
-                continue
 
             if entity is None:
                 task_logger.error(
-                    f"Could not find entity for sync record {sync_record.id} "
+                    f"Sync record of type {sync_record.sync_type} doesn't have an entity "
-                    f"(type={sync_record.sync_type}, id={sync_record.entity_id})."
+                    f"associated with it (id={sync_record.entity_id}). Skipping start latency metric."
                 )
-                continue
 
             # Calculate start latency in seconds:
             #    (actual sync start) - (last modified time)
-            if entity.time_last_modified_by_user and sync_record.sync_start_time:
+            if (
+                entity is not None
+                and entity.time_last_modified_by_user
+                and sync_record.sync_start_time
+            ):
                 start_latency = (
                     sync_record.sync_start_time - entity.time_last_modified_by_user
                 ).total_seconds()
@@ -541,8 +623,6 @@ def _collect_sync_metrics(db_session: Session, redis_std: Redis) -> list[Metric]
                     )
                 )
 
-                _mark_metric_as_emitted(redis_std, start_latency_key)
-
     return metrics
 
 
@@ -607,9 +687,12 @@ def monitor_background_processes(self: Task, *, tenant_id: str | None) -> None:
             for metric_fn in metric_functions:
                 metrics = metric_fn()
                 for metric in metrics:
+                    # double check to make sure we aren't double-emitting metrics
+                    if metric.key is not None and not _has_metric_been_emitted(
+                        redis_std, metric.key
+                    ):
                         metric.log()
                         metric.emit(tenant_id)
-                    if metric.key:
                         _mark_metric_as_emitted(redis_std, metric.key)
 
         task_logger.info("Successfully collected background metrics")

backend/onyx/background/celery/tasks/pruning/tasks.py

@@ -25,13 +25,18 @@ from onyx.configs.constants import OnyxCeleryTask
 from onyx.configs.constants import OnyxRedisLocks
 from onyx.connectors.factory import instantiate_connector
 from onyx.connectors.models import InputType
+from onyx.db.connector import mark_ccpair_as_pruned
 from onyx.db.connector_credential_pair import get_connector_credential_pair
 from onyx.db.connector_credential_pair import get_connector_credential_pair_from_id
 from onyx.db.connector_credential_pair import get_connector_credential_pairs
 from onyx.db.document import get_documents_for_connector_credential_pair
 from onyx.db.engine import get_session_with_tenant
 from onyx.db.enums import ConnectorCredentialPairStatus
+from onyx.db.enums import SyncStatus
+from onyx.db.enums import SyncType
 from onyx.db.models import ConnectorCredentialPair
+from onyx.db.sync_record import insert_sync_record
+from onyx.db.sync_record import update_sync_record_status
 from onyx.redis.redis_connector import RedisConnector
 from onyx.redis.redis_pool import get_redis_client
 from onyx.utils.logger import pruning_ctx
@@ -40,6 +45,9 @@ from onyx.utils.logger import setup_logger
 logger = setup_logger()
 
 
+"""Jobs / utils for kicking off pruning tasks."""
+
+
 def _is_pruning_due(cc_pair: ConnectorCredentialPair) -> bool:
     """Returns boolean indicating if pruning is due.
 
@@ -204,6 +212,14 @@ def try_creating_prune_generator_task(
             priority=OnyxCeleryPriority.LOW,
         )
 
+        # create before setting fence to avoid race condition where the monitoring
+        # task updates the sync record before it is created
+        insert_sync_record(
+            db_session=db_session,
+            entity_id=cc_pair.id,
+            sync_type=SyncType.PRUNING,
+        )
+
         # set this only after all tasks have been added
         redis_connector.prune.set_fence(True)
     except Exception:
@@ -348,3 +364,52 @@ def connector_pruning_generator_task(
             lock.release()
 
         task_logger.info(f"Pruning generator finished: cc_pair={cc_pair_id}")
+
+
+"""Monitoring pruning utils, called in monitor_vespa_sync"""
+
+
+def monitor_ccpair_pruning_taskset(
+    tenant_id: str | None, key_bytes: bytes, r: Redis, db_session: Session
+) -> None:
+    fence_key = key_bytes.decode("utf-8")
+    cc_pair_id_str = RedisConnector.get_id_from_fence_key(fence_key)
+    if cc_pair_id_str is None:
+        task_logger.warning(
+            f"monitor_ccpair_pruning_taskset: could not parse cc_pair_id from {fence_key}"
+        )
+        return
+
+    cc_pair_id = int(cc_pair_id_str)
+
+    redis_connector = RedisConnector(tenant_id, cc_pair_id)
+    if not redis_connector.prune.fenced:
+        return
+
+    initial = redis_connector.prune.generator_complete
+    if initial is None:
+        return
+
+    remaining = redis_connector.prune.get_remaining()
+    task_logger.info(
+        f"Connector pruning progress: cc_pair={cc_pair_id} remaining={remaining} initial={initial}"
+    )
+    if remaining > 0:
+        return
+
+    mark_ccpair_as_pruned(int(cc_pair_id), db_session)
+    task_logger.info(
+        f"Successfully pruned connector credential pair. cc_pair={cc_pair_id}"
+    )
+
+    update_sync_record_status(
+        db_session=db_session,
+        entity_id=cc_pair_id,
+        sync_type=SyncType.PRUNING,
+        sync_status=SyncStatus.SUCCESS,
+        num_docs_synced=initial,
+    )
+
+    redis_connector.prune.taskset_clear()
+    redis_connector.prune.generator_clear()
+    redis_connector.prune.set_fence(False)

backend/onyx/background/celery/tasks/vespa/tasks.py

@@ -24,6 +24,10 @@ from onyx.access.access import get_access_for_document
 from onyx.background.celery.apps.app_base import task_logger
 from onyx.background.celery.celery_redis import celery_get_queue_length
 from onyx.background.celery.celery_redis import celery_get_unacked_task_ids
+from onyx.background.celery.tasks.doc_permission_syncing.tasks import (
+    monitor_ccpair_permissions_taskset,
+)
+from onyx.background.celery.tasks.pruning.tasks import monitor_ccpair_pruning_taskset
 from onyx.background.celery.tasks.shared.RetryDocumentIndex import RetryDocumentIndex
 from onyx.background.celery.tasks.shared.tasks import LIGHT_SOFT_TIME_LIMIT
 from onyx.background.celery.tasks.shared.tasks import LIGHT_TIME_LIMIT
@@ -34,8 +38,6 @@ from onyx.configs.constants import OnyxCeleryQueues
 from onyx.configs.constants import OnyxCeleryTask
 from onyx.configs.constants import OnyxRedisLocks
 from onyx.db.connector import fetch_connector_by_id
-from onyx.db.connector import mark_cc_pair_as_permissions_synced
-from onyx.db.connector import mark_ccpair_as_pruned
 from onyx.db.connector_credential_pair import add_deletion_failure_message
 from onyx.db.connector_credential_pair import (
     delete_connector_credential_pair__no_commit,
@@ -72,9 +74,6 @@ from onyx.redis.redis_connector import RedisConnector
 from onyx.redis.redis_connector_credential_pair import RedisConnectorCredentialPair
 from onyx.redis.redis_connector_delete import RedisConnectorDelete
 from onyx.redis.redis_connector_doc_perm_sync import RedisConnectorPermissionSync
-from onyx.redis.redis_connector_doc_perm_sync import (
-    RedisConnectorPermissionSyncPayload,
-)
 from onyx.redis.redis_connector_index import RedisConnectorIndex
 from onyx.redis.redis_connector_prune import RedisConnectorPrune
 from onyx.redis.redis_document_set import RedisDocumentSet
@@ -653,83 +652,6 @@ def monitor_connector_deletion_taskset(
     redis_connector.delete.reset()
 
 
-def monitor_ccpair_pruning_taskset(
-    tenant_id: str | None, key_bytes: bytes, r: Redis, db_session: Session
-) -> None:
-    fence_key = key_bytes.decode("utf-8")
-    cc_pair_id_str = RedisConnector.get_id_from_fence_key(fence_key)
-    if cc_pair_id_str is None:
-        task_logger.warning(
-            f"monitor_ccpair_pruning_taskset: could not parse cc_pair_id from {fence_key}"
-        )
-        return
-
-    cc_pair_id = int(cc_pair_id_str)
-
-    redis_connector = RedisConnector(tenant_id, cc_pair_id)
-    if not redis_connector.prune.fenced:
-        return
-
-    initial = redis_connector.prune.generator_complete
-    if initial is None:
-        return
-
-    remaining = redis_connector.prune.get_remaining()
-    task_logger.info(
-        f"Connector pruning progress: cc_pair={cc_pair_id} remaining={remaining} initial={initial}"
-    )
-    if remaining > 0:
-        return
-
-    mark_ccpair_as_pruned(int(cc_pair_id), db_session)
-    task_logger.info(
-        f"Successfully pruned connector credential pair. cc_pair={cc_pair_id}"
-    )
-
-    redis_connector.prune.taskset_clear()
-    redis_connector.prune.generator_clear()
-    redis_connector.prune.set_fence(False)
-
-
-def monitor_ccpair_permissions_taskset(
-    tenant_id: str | None, key_bytes: bytes, r: Redis, db_session: Session
-) -> None:
-    fence_key = key_bytes.decode("utf-8")
-    cc_pair_id_str = RedisConnector.get_id_from_fence_key(fence_key)
-    if cc_pair_id_str is None:
-        task_logger.warning(
-            f"monitor_ccpair_permissions_taskset: could not parse cc_pair_id from {fence_key}"
-        )
-        return
-
-    cc_pair_id = int(cc_pair_id_str)
-
-    redis_connector = RedisConnector(tenant_id, cc_pair_id)
-    if not redis_connector.permissions.fenced:
-        return
-
-    initial = redis_connector.permissions.generator_complete
-    if initial is None:
-        return
-
-    remaining = redis_connector.permissions.get_remaining()
-    task_logger.info(
-        f"Permissions sync progress: cc_pair={cc_pair_id} remaining={remaining} initial={initial}"
-    )
-    if remaining > 0:
-        return
-
-    payload: RedisConnectorPermissionSyncPayload | None = (
-        redis_connector.permissions.payload
-    )
-    start_time: datetime | None = payload.started if payload else None
-
-    mark_cc_pair_as_permissions_synced(db_session, int(cc_pair_id), start_time)
-    task_logger.info(f"Successfully synced permissions for cc_pair={cc_pair_id}")
-
-    redis_connector.permissions.reset()
-
-
 def monitor_ccpair_indexing_taskset(
     tenant_id: str | None, key_bytes: bytes, r: Redis, db_session: Session
 ) -> None:

backend/onyx/db/enums.py

@@ -28,6 +28,9 @@ class SyncType(str, PyEnum):
     DOCUMENT_SET = "document_set"
     USER_GROUP = "user_group"
     CONNECTOR_DELETION = "connector_deletion"
+    PRUNING = "pruning"  # not really a sync, but close enough
+    EXTERNAL_PERMISSIONS = "external_permissions"
+    EXTERNAL_GROUP = "external_group"
 
     def __str__(self) -> str:
         return self.value

backend/onyx/redis/redis_connector_prune.py

@@ -92,7 +92,7 @@ class RedisConnectorPrune:
         if fence_bytes is None:
             return None
 
-        fence_int = cast(int, fence_bytes)
+        fence_int = int(cast(bytes, fence_bytes))
         return fence_int
 
     @generator_complete.setter