# What this PR does
- Rename `SlackClientWithErrorHandling` to just `SlackClient`
- Add more error classes + improve the way errors are raised based on
the Slack error code
- Add API call retries on Slack server errors (e.g. when Slack returns
`5xx` errors)
- Refactor some methods working with Slack API + add tests
## Which issue(s) this PR fixes
- https://github.com/grafana/oncall-private/issues/1837
- https://github.com/grafana/oncall-private/issues/1840
- https://github.com/grafana/oncall-private/issues/1842
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
# What this PR does
- update `slackclient` dependency to latest version. The version we were
using was 5 years old 😲
- first followed the v2 migration guide
[here](https://github.com/slackapi/python-slack-sdk/wiki/Migrating-to-2.x)
followed by the v3 migration guide
[here](https://slack.dev/python-slack-sdk/v3-migration/). The main
changes were:
- The PyPI project was renamed from `slackclient` to `slack_sdk`
- it is discouraged/harder to call `api_call` and encouraged to call the
helper methods (ex. `chat_postMessage`;
[note](https://github.com/slackapi/python-slack-sdk/wiki/Migrating-to-2.x#web-client-api-changes)
in migration guide docs)
- In 1.x, a failed api call would return the error payload to you and
have you handle the error. In 2.x, a failed api call will throw an
exception. To handle this in your code, you will have to wrap api calls
with a try except block. Since we overload `WebClient.api_call` this was
an easy change and only required a one line change
- remove `apps.slack.slack_client.slack_server.SlackClientServer` class.
The new version of `slack_sdk` handles the case that we needed to
overload for in the first place.
- merged `apps/slack/slack_client/slack_client.py` and
`apps/slack/slack_client/exceptions.py` into `apps/slack/client.py`
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
# What this PR does
This PR simplifies code of maintenance mode.
1. Perform distribution/escalation maintenance checks in send_signal...
tasks.
2. Use usual alert distribution flow for the maintenance incident.
3. Decouple maintenance mode from slack (all, except
**notify_about_maintenance_action** methods, I don't want to make this
PR too big)
As a bonus from these changes, maintenance mode now mute alert group
delivery in all chatops integrations, not only in slack. (Before,
incidents happened while maintenance were posted to telegram and msteams
anyway)
## Checklist
- [ ] Tests updated
- [ ] Documentation added
- [ ] `CHANGELOG.md` updated
