Avoid retrying to update Slack log message if cant_update_message (#4329)

Do not retry updating a message if Slack returns `cant_update_message`
API [error](https://api.slack.com/methods/chat.update#errors) (meaning
bot user has no permission to update the message).

engine/apps/slack/errors.py

@@ -68,6 +68,10 @@ class SlackAPIMessageNotFoundError(SlackAPIError):
     errors = ("message_not_found",)
 
 
+class SlackAPICantUpdateMessageError(SlackAPIError):
+    errors = ("cant_update_message",)
+
+
 class SlackAPIUserNotFoundError(SlackAPIError):
     errors = ("user_not_found",)
 

engine/apps/slack/scenarios/distribute_alerts.py

@@ -13,6 +13,7 @@ from apps.alerts.models import Alert, AlertGroup, AlertGroupLogRecord, AlertRece
 from apps.api.permissions import RBACPermission
 from apps.slack.constants import CACHE_UPDATE_INCIDENT_SLACK_MESSAGE_LIFETIME
 from apps.slack.errors import (
+    SlackAPICantUpdateMessageError,
     SlackAPIChannelArchivedError,
     SlackAPIChannelInactiveError,
     SlackAPIChannelNotFoundError,
@@ -947,6 +948,7 @@ class UpdateLogReportMessageStep(scenario_step.ScenarioStep):
                 SlackAPIChannelArchivedError,
                 SlackAPIChannelInactiveError,
                 SlackAPIInvalidAuthError,
+                SlackAPICantUpdateMessageError,
             ):
                 pass
             else:

engine/apps/slack/tests/test_scenario_steps/test_distribute_alerts.py

@@ -1,11 +1,12 @@
 from unittest.mock import patch
 
 import pytest
+from django.utils import timezone
 
 from apps.alerts.models import AlertGroup
-from apps.slack.errors import SlackAPIRestrictedActionError
+from apps.slack.errors import SlackAPICantUpdateMessageError, SlackAPIRestrictedActionError
 from apps.slack.models import SlackMessage
-from apps.slack.scenarios.distribute_alerts import AlertShootingStep
+from apps.slack.scenarios.distribute_alerts import AlertShootingStep, UpdateLogReportMessageStep
 from apps.slack.scenarios.scenario_step import ScenarioStep
 from apps.slack.tests.conftest import build_slack_response
 
@@ -64,3 +65,37 @@ def test_alert_shooting_no_channel_filter(
 
     mock_post_alert_group_to_slack.assert_called_once()
     assert mock_post_alert_group_to_slack.call_args[1]["channel_id"] == "DEFAULT_CHANNEL_ID"
+
+
+@pytest.mark.django_db
+def test_update_log_report_cant_update(
+    make_slack_team_identity,
+    make_organization,
+    make_alert_receive_channel,
+    make_alert_group,
+    make_alert,
+    make_slack_message,
+):
+    slack_team_identity = make_slack_team_identity()
+    organization = make_organization(
+        slack_team_identity=slack_team_identity, general_log_channel_id="DEFAULT_CHANNEL_ID"
+    )
+    alert_receive_channel = make_alert_receive_channel(organization)
+
+    alert_group = make_alert_group(alert_receive_channel, channel_filter=None)
+    # alert = make_alert(alert_group, raw_request_data={})
+    log_message = make_slack_message(
+        alert_group=alert_group,
+        channel_id="RANDOM_CHANNEL_ID",
+        slack_id="RANDOM_MESSAGE_ID",
+        last_updated=timezone.now() - timezone.timedelta(minutes=5),
+    )
+    alert_group.slack_log_message = log_message
+
+    step = UpdateLogReportMessageStep(slack_team_identity, organization)
+    with patch.object(step._slack_client, "api_call") as mock_slack_api_call:
+        mock_slack_api_call.side_effect = SlackAPICantUpdateMessageError(
+            response=build_slack_response({"error": "cant_update_message"})
+        )
+        # not raising error, will not retry
+        step.update_log_message(alert_group)

engine/apps/slack/tests/test_slack_client.py

@@ -9,6 +9,7 @@ from slack_sdk.web import SlackResponse
 from apps.slack.client import SlackClient, server_error_retry_handler
 from apps.slack.errors import (
     SlackAPICannotDMBotError,
+    SlackAPICantUpdateMessageError,
     SlackAPIChannelArchivedError,
     SlackAPIChannelInactiveError,
     SlackAPIChannelNotFoundError,
@@ -116,6 +117,7 @@ def test_slack_client_generic_error(mock_request, monkeypatch, make_organization
     [
         ("account_inactive", SlackAPITokenError),
         ("cannot_dm_bot", SlackAPICannotDMBotError),
+        ("cant_update_message", SlackAPICantUpdateMessageError),
         ("channel_not_found", SlackAPIChannelNotFoundError),
         ("fatal_error", SlackAPIServerError),
         ("fetch_members_failed", SlackAPIFetchMembersFailedError),