Frontend crash with 500 error if redis connection cant be established by the API

[mhkc]

Describe the bug
The frontend crashes with an internal server error if the API cant establish a connection to redis.

Frontend stack trace

  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 2190, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1486, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1484, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1469, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask_login/utils.py", line 290, in decorated_view
    return current_app.ensure_sync(func)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/blueprints/sample/views.py", line 91, in sample
    job = find_and_cluster_similar_samples(
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/blueprints/sample/views.py", line 91, in sample
    job = find_and_cluster_similar_samples(
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/bonsai.py", line 48, in wrapper
    return func(headers=headers, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/bonsai.py", line 359, in find_and_cluster_similar_samples
    resp.raise_for_status()
  File "/usr/local/lib/python3.11/site-packages/requests/models.py", line 1021, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http://mtlucmds1.lund.skane.se/bonsai/api/v1/samples/SUS-test-2/similar

API stacktrace

    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/fastapi/routing.py", line 191, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/routers/samples.py", line 485, in find_similar_samples
    submission_info: SubmittedJob = schedule_find_similar_and_cluster(
                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/worker/app/app/redis/minhash.py", line 105, in schedule_find_similar_and_cluster
    job = redis.minhash.enqueue(
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/queue.py", line 972, in enqueue
    return self.enqueue_call(
           ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/queue.py", line 721, in enqueue_call
    return self.enqueue_job(job, pipeline=pipeline, at_front=at_front)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/queue.py", line 1095, in enqueue_job
    return self._enqueue_job(job, pipeline=pipeline, at_front=at_front)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/queue.py", line 1115, in _enqueue_job
    job.redis_server_version = self.get_redis_server_version()
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/queue.py", line 219, in get_redis_server_version
    self.redis_server_version = get_version(self.connection)
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rq/utils.py", line 293, in get_version
    tuple(int(i) for i in connection.info("server")["redis_version"].split('.')[:3]),
                          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/redis/commands/core.py", line 1004, in info
    return self.execute_command("INFO", section, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 533, in execute_command
    conn = self.connection or pool.get_connection(command_name, **options)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/redis/connection.py", line 1086, in get_connection
    connection.connect()
  File "/usr/local/lib/python3.11/site-packages/redis/connection.py", line 270, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error -2 connecting to redis:6379. Name or service not known.

[samuell]

I assume this is what I'm also running into, every time I try to log in through the web interface.

Is there any known workaround for this?