Airgapped: envoy gets stuck installing with Failed to resolve 'raw.githubusercontent.com' attempting to download relation schema

[NohaIhab]

Bug Description

When deploying CKF 1.8/stable on airgapped, the envoy charm gets stuck in maintenance with the unit message being (leader-elected) installing charm software.
In the relevant logs, it is observed that envoy charm is trying to download the shcema for the grpc relation.
Looking at the metadata.yaml, the relation is defined as follows:

  grpc:
    interface: grpc
    schema: https://raw.githubusercontent.com/canonical/operator-schemas/master/grpc.yaml
    versions: [v1]

Indeed we are using a remote reference for the schema, this is a blocker for deploying envoy in airgapped.
The same applies for the grpc-web relation.

To fix this, we can define the schema in the metadata.yaml and have the url set in the __schema_source attribute for reference.

This was reported in canonical/bundle-kubeflow#818, see point 1..

To Reproduce

Deploy envoy 2.0/stable in airgapped

Environment

microk8s 1.25-strict/stable
juju 3.1/stable

Relevant Log Output

2024-05-24 07:19:00 ERROR juju-log Uncaught exception while in charm code:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connection.py", line 203, in _new_conn
    sock = connection.create_connection(
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/util/connection.py", line 60, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "/usr/lib/python3.8/socket.py", line 918, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -3] Temporary failure in name resolution

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connectionpool.py", line 790, in urlopen
    response = self._make_request(
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connectionpool.py", line 491, in _make_request
    raise new_e
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connectionpool.py", line 467, in _make_request
    self._validate_conn(conn)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connectionpool.py", line 1092, in _validate_conn
    conn.connect()
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connection.py", line 611, in connect
    self.sock = sock = self._new_conn()
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connection.py", line 210, in _new_conn
    raise NameResolutionError(self.host, self, e) from e
urllib3.exceptions.NameResolutionError: <urllib3.connection.HTTPSConnection object at 0x7bab20b7d940>: Failed to resolve 'raw.githubusercontent.com' ([Errno -3] Temporary failure in name resolution)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/adapters.py", line 486, in send
    resp = conn.urlopen(
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/connectionpool.py", line 844, in urlopen
    retries = retries.increment(
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/urllib3/util/retry.py", line 515, in increment
    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='raw.githubusercontent.com', port=443): Max retries exceeded with url: /canonical/operator-schemas/master/grpc.yaml (Caused by NameResolutionError("<urllib3.connection.HTTPSConnection object at 0x7bab20b7d940>: Failed to resolve 'raw.githubusercontent.com' ([Errno -3] Temporary failure in name resolution)"))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./src/charm.py", line 308, in <module>
    main(Operator)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/ops/main.py", line 441, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/ops/main.py", line 149, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/ops/framework.py", line 342, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/ops/framework.py", line 839, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/ops/framework.py", line 928, in _reemit
    custom_handler(event)
  File "./src/charm.py", line 165, in set_pod_spec
    interfaces = self._get_interfaces()
  File "./src/charm.py", line 261, in _get_interfaces
    interfaces = get_interfaces(self)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/serialized_data_interface/sdi.py", line 351, in get_interfaces
    return {
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/serialized_data_interface/sdi.py", line 352, in <dictcomp>
    endpoint: get_interface(charm, endpoint)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/serialized_data_interface/sdi.py", line 375, in get_interface
    schema = utils.get_schema(interface["schema"])
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/serialized_data_interface/utils.py", line 68, in get_schema
    response = _get_schema_response_from_remote(schema)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/serialized_data_interface/utils.py", line 93, in _get_schema_response_from_remote
    response = requests.get(url=url, proxies=proxies)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/api.py", line 73, in get
    return request("get", url, params=params, **kwargs)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/api.py", line 59, in request
    return session.request(method=method, url=url, **kwargs)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
  File "/var/lib/juju/agents/unit-envoy-0/charm/venv/requests/adapters.py", line 519, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='raw.githubusercontent.com', port=443): Max retries exceeded with url: /canonical/operator-schemas/master/grpc.yaml (Caused by NameResolutionError("<urllib3.connection.HTTPSConnection object at 0x7bab20b7d940>: Failed to resolve 'raw.githubusercontent.com' ([Errno -3] Temporary failure in name resolution)"))

Additional Context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5741.

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[NohaIhab]

closed by #99