openstack
/
charm-openstack-hypervisor
Code Issues Proposed changes

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Liam Young 2023-03-30 08:23:30 +00:00
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venv/
build/
*.charm
.tox/
.coverage
__pycache__/
*.py[cod]
.idea
.vscode/
.stestr/

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[DEFAULT]
test_path=./tests/unit
top_dir=./tests

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# Contributing
To make contributions to this charm, you'll need a working [development setup](https://juju.is/docs/sdk/dev-setup).
You can use the environments created by `tox` for development:
```shell
tox --notest -e unit
source .tox/unit/bin/activate
```
## Testing
This project uses `tox` for managing test environments. There are some pre-configured environments
that can be used for linting and formatting code when you're preparing contributions to the charm:
```shell
tox -e fmt # update your code according to linting rules
tox -e lint # code style
tox -e unit # unit tests
tox -e integration # integration tests
tox # runs 'lint' and 'unit' environments
```
## Build the charm
Build the charm in this git repository using:
```shell
charmcraft pack
```
<!-- You may want to include any contribution/style guidelines in this document>

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# openstack-hypervisor
Charmhub package name: operator-template
More information: https://charmhub.io/openstack-hypervisor
Describe your charm in one or two sentences.
## Other resources
<!-- If your charm is documented somewhere else other than Charmhub, provide a link separately. -->
- [Read more](https://example.com)
- [Contributing](CONTRIBUTING.md) <!-- or link to other contribution documentation -->
- See the [Juju SDK documentation](https://juju.is/docs/sdk) for more information about developing and improving charms.

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# This file configures Charmcraft.
# See https://juju.is/docs/sdk/charmcraft-config for guidance.
type: charm
bases:
- build-on:
- name: ubuntu
channel: "22.04"
run-on:
- name: ubuntu
channel: "22.04"
parts:
charm:
build-packages:
- git
- libffi-dev
- libssl-dev
- pkg-config
- rustc
- cargo

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options:
snap-channel:
default: "yoga/edge"
type: string
debug:
default: False
type: boolean
dns-domain:
default: "openstack.local"
type: string
dns-servers:
default: "8.8.8.8"
type: string
enable-gateway:
default: False
type: boolean
external-bridge:
default: "br-ex"
type: string
external-bridge-address:
default:
type: string
ip-address:
default:
type: string
physnet-name:
default: "physnet1"
type: string

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# Copyright 2022 Canonical Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Relation 'requires' side abstraction for database relation.
This library is a uniform interface to a selection of common database
metadata, with added custom events that add convenience to database management,
and methods to consume the application related data.
Following an example of using the DatabaseCreatedEvent, in the context of the
application charm code:
```python
from charms.data_platform_libs.v0.database_requires import DatabaseRequires
class ApplicationCharm(CharmBase):
# Application charm that connects to database charms.
def __init__(self, *args):
super().__init__(*args)
# Charm events defined in the database requires charm library.
self.database = DatabaseRequires(self, relation_name="database", database_name="database")
self.framework.observe(self.database.on.database_created, self._on_database_created)
def _on_database_created(self, event: DatabaseCreatedEvent) -> None:
# Handle the created database
# Create configuration file for app
config_file = self._render_app_config_file(
event.username,
event.password,
event.endpoints,
)
# Start application with rendered configuration
self._start_application(config_file)
# Set active status
self.unit.status = ActiveStatus("received database credentials")
```
As shown above, the library provides some custom events to handle specific situations,
which are listed below:
— database_created: event emitted when the requested database is created.
— endpoints_changed: event emitted when the read/write endpoints of the database have changed.
— read_only_endpoints_changed: event emitted when the read-only endpoints of the database
have changed. Event is not triggered if read/write endpoints changed too.
If it is needed to connect multiple database clusters to the same relation endpoint
the application charm can implement the same code as if it would connect to only
one database cluster (like the above code example).
To differentiate multiple clusters connected to the same relation endpoint
the application charm can use the name of the remote application:
```python
def _on_database_created(self, event: DatabaseCreatedEvent) -> None:
# Get the remote app name of the cluster that triggered this event
cluster = event.relation.app.name
```
It is also possible to provide an alias for each different database cluster/relation.
So, it is possible to differentiate the clusters in two ways.
The first is to use the remote application name, i.e., `event.relation.app.name`, as above.
The second way is to use different event handlers to handle each cluster events.
The implementation would be something like the following code:
```python
from charms.data_platform_libs.v0.database_requires import DatabaseRequires
class ApplicationCharm(CharmBase):
# Application charm that connects to database charms.
def __init__(self, *args):
super().__init__(*args)
# Define the cluster aliases and one handler for each cluster database created event.
self.database = DatabaseRequires(
self,
relation_name="database",
database_name="database",
relations_aliases = ["cluster1", "cluster2"],
)
self.framework.observe(
self.database.on.cluster1_database_created, self._on_cluster1_database_created
)
self.framework.observe(
self.database.on.cluster2_database_created, self._on_cluster2_database_created
)
def _on_cluster1_database_created(self, event: DatabaseCreatedEvent) -> None:
# Handle the created database on the cluster named cluster1
# Create configuration file for app
config_file = self._render_app_config_file(
event.username,
event.password,
event.endpoints,
)
...
def _on_cluster2_database_created(self, event: DatabaseCreatedEvent) -> None:
# Handle the created database on the cluster named cluster2
# Create configuration file for app
config_file = self._render_app_config_file(
event.username,
event.password,
event.endpoints,
)
...
```
"""
import json
import logging
from collections import namedtuple
from datetime import datetime
from typing import List, Optional
from ops.charm import (
CharmEvents,
RelationChangedEvent,
RelationEvent,
RelationJoinedEvent,
)
from ops.framework import EventSource, Object
from ops.model import Relation
# The unique Charmhub library identifier, never change it
LIBID = "0241e088ffa9440fb4e3126349b2fb62"
# Increment this major API version when introducing breaking changes
LIBAPI = 0
# Increment this PATCH version before using `charmcraft publish-lib` or reset
# to 0 if you are raising the major API version.
LIBPATCH = 4
logger = logging.getLogger(__name__)
class DatabaseEvent(RelationEvent):
"""Base class for database events."""
@property
def endpoints(self) -> Optional[str]:
"""Returns a comma separated list of read/write endpoints."""
return self.relation.data[self.relation.app].get("endpoints")
@property
def password(self) -> Optional[str]:
"""Returns the password for the created user."""
return self.relation.data[self.relation.app].get("password")
@property
def read_only_endpoints(self) -> Optional[str]:
"""Returns a comma separated list of read only endpoints."""
return self.relation.data[self.relation.app].get("read-only-endpoints")
@property
def replset(self) -> Optional[str]:
"""Returns the replicaset name.
MongoDB only.
"""
return self.relation.data[self.relation.app].get("replset")
@property
def tls(self) -> Optional[str]:
"""Returns whether TLS is configured."""
return self.relation.data[self.relation.app].get("tls")
@property
def tls_ca(self) -> Optional[str]:
"""Returns TLS CA."""
return self.relation.data[self.relation.app].get("tls-ca")
@property
def uris(self) -> Optional[str]:
"""Returns the connection URIs.
MongoDB, Redis, OpenSearch and Kafka only.
"""
return self.relation.data[self.relation.app].get("uris")
@property
def username(self) -> Optional[str]:
"""Returns the created username."""
return self.relation.data[self.relation.app].get("username")
@property
def version(self) -> Optional[str]:
"""Returns the version of the database.
Version as informed by the database daemon.
"""
return self.relation.data[self.relation.app].get("version")
class DatabaseCreatedEvent(DatabaseEvent):
"""Event emitted when a new database is created for use on this relation."""
class DatabaseEndpointsChangedEvent(DatabaseEvent):
"""Event emitted when the read/write endpoints are changed."""
class DatabaseReadOnlyEndpointsChangedEvent(DatabaseEvent):
"""Event emitted when the read only endpoints are changed."""
class DatabaseEvents(CharmEvents):
"""Database events.
This class defines the events that the database can emit.
"""
database_created = EventSource(DatabaseCreatedEvent)
endpoints_changed = EventSource(DatabaseEndpointsChangedEvent)
read_only_endpoints_changed = EventSource(DatabaseReadOnlyEndpointsChangedEvent)
Diff = namedtuple("Diff", "added changed deleted")
Diff.__doc__ = """
A tuple for storing the diff between two data mappings.
— added — keys that were added.
— changed — keys that still exist but have new values.
— deleted — keys that were deleted.
"""
class DatabaseRequires(Object):
"""Requires-side of the database relation."""
on = DatabaseEvents()
def __init__(
self,
charm,
relation_name: str,
database_name: str,
extra_user_roles: str = None,
relations_aliases: List[str] = None,
):
"""Manager of database client relations."""
super().__init__(charm, relation_name)
self.charm = charm
self.database = database_name
self.extra_user_roles = extra_user_roles
self.local_app = self.charm.model.app
self.local_unit = self.charm.unit
self.relation_name = relation_name
self.relations_aliases = relations_aliases
self.framework.observe(
self.charm.on[relation_name].relation_joined, self._on_relation_joined_event
)
self.framework.observe(
self.charm.on[relation_name].relation_changed, self._on_relation_changed_event
)
# Define custom event names for each alias.
if relations_aliases:
# Ensure the number of aliases does not exceed the maximum
# of connections allowed in the specific relation.
relation_connection_limit = self.charm.meta.requires[relation_name].limit
if len(relations_aliases) != relation_connection_limit:
raise ValueError(
f"The number of aliases must match the maximum number of connections allowed in the relation. "
f"Expected {relation_connection_limit}, got {len(relations_aliases)}"
)
for relation_alias in relations_aliases:
self.on.define_event(f"{relation_alias}_database_created", DatabaseCreatedEvent)
self.on.define_event(
f"{relation_alias}_endpoints_changed", DatabaseEndpointsChangedEvent
)
self.on.define_event(
f"{relation_alias}_read_only_endpoints_changed",
DatabaseReadOnlyEndpointsChangedEvent,
)
def _assign_relation_alias(self, relation_id: int) -> None:
"""Assigns an alias to a relation.
This function writes in the unit data bag.
Args:
relation_id: the identifier for a particular relation.
"""
# If no aliases were provided, return immediately.
if not self.relations_aliases:
return
# Return if an alias was already assigned to this relation
# (like when there are more than one unit joining the relation).
if (
self.charm.model.get_relation(self.relation_name, relation_id)
.data[self.local_unit]
.get("alias")
):
return
# Retrieve the available aliases (the ones that weren't assigned to any relation).
available_aliases = self.relations_aliases[:]
for relation in self.charm.model.relations[self.relation_name]:
alias = relation.data[self.local_unit].get("alias")
if alias:
logger.debug("Alias %s was already assigned to relation %d", alias, relation.id)
available_aliases.remove(alias)
# Set the alias in the unit relation databag of the specific relation.
relation = self.charm.model.get_relation(self.relation_name, relation_id)
relation.data[self.local_unit].update({"alias": available_aliases[0]})
def _diff(self, event: RelationChangedEvent) -> Diff:
"""Retrieves the diff of the data in the relation changed databag.
Args:
event: relation changed event.
Returns:
a Diff instance containing the added, deleted and changed
keys from the event relation databag.
"""
# Retrieve the old data from the data key in the local unit relation databag.
old_data = json.loads(event.relation.data[self.local_unit].get("data", "{}"))
# Retrieve the new data from the event relation databag.
new_data = {
key: value for key, value in event.relation.data[event.app].items() if key != "data"
}
# These are the keys that were added to the databag and triggered this event.
added = new_data.keys() - old_data.keys()
# These are the keys that were removed from the databag and triggered this event.
deleted = old_data.keys() - new_data.keys()
# These are the keys that already existed in the databag,
# but had their values changed.
changed = {
key for key in old_data.keys() & new_data.keys() if old_data[key] != new_data[key]
}
# TODO: evaluate the possibility of losing the diff if some error
# happens in the charm before the diff is completely checked (DPE-412).
# Convert the new_data to a serializable format and save it for a next diff check.
event.relation.data[self.local_unit].update({"data": json.dumps(new_data)})
# Return the diff with all possible changes.
return Diff(added, changed, deleted)
def _emit_aliased_event(self, event: RelationChangedEvent, event_name: str) -> None:
"""Emit an aliased event to a particular relation if it has an alias.
Args:
event: the relation changed event that was received.
event_name: the name of the event to emit.
"""
alias = self._get_relation_alias(event.relation.id)
if alias:
getattr(self.on, f"{alias}_{event_name}").emit(
event.relation, app=event.app, unit=event.unit
)
def _get_relation_alias(self, relation_id: int) -> Optional[str]:
"""Returns the relation alias.
Args:
relation_id: the identifier for a particular relation.
Returns:
the relation alias or None if the relation was not found.
"""
for relation in self.charm.model.relations[self.relation_name]:
if relation.id == relation_id:
return relation.data[self.local_unit].get("alias")
return None
def fetch_relation_data(self) -> dict:
"""Retrieves data from relation.
This function can be used to retrieve data from a relation
in the charm code when outside an event callback.
Returns:
a dict of the values stored in the relation data bag
for all relation instances (indexed by the relation ID).
"""
data = {}
for relation in self.relations:
data[relation.id] = {
key: value for key, value in relation.data[relation.app].items() if key != "data"
}
return data
def _update_relation_data(self, relation_id: int, data: dict) -> None:
"""Updates a set of key-value pairs in the relation.
This function writes in the application data bag, therefore,
only the leader unit can call it.
Args:
relation_id: the identifier for a particular relation.
data: dict containing the key-value pairs
that should be updated in the relation.
"""
if self.local_unit.is_leader():
relation = self.charm.model.get_relation(self.relation_name, relation_id)
relation.data[self.local_app].update(data)
def _on_relation_joined_event(self, event: RelationJoinedEvent) -> None:
"""Event emitted when the application joins the database relation."""
# If relations aliases were provided, assign one to the relation.
self._assign_relation_alias(event.relation.id)
# Sets both database and extra user roles in the relation
# if the roles are provided. Otherwise, sets only the database.
if self.extra_user_roles:
self._update_relation_data(
event.relation.id,
{
"database": self.database,
"extra-user-roles": self.extra_user_roles,
},
)
else:
self._update_relation_data(event.relation.id, {"database": self.database})
def _on_relation_changed_event(self, event: RelationChangedEvent) -> None:
"""Event emitted when the database relation has changed."""
# Check which data has changed to emit customs events.
diff = self._diff(event)
# Check if the database is created
# (the database charm shared the credentials).
if "username" in diff.added and "password" in diff.added:
# Emit the default event (the one without an alias).
logger.info("database created at %s", datetime.now())
self.on.database_created.emit(event.relation, app=event.app, unit=event.unit)
# Emit the aliased event (if any).
self._emit_aliased_event(event, "database_created")
# To avoid unnecessary application restarts do not trigger
# “endpoints_changed“ event if “database_created“ is triggered.
return
# Emit an endpoints changed event if the database
# added or changed this info in the relation databag.
if "endpoints" in diff.added or "endpoints" in diff.changed:
# Emit the default event (the one without an alias).
logger.info("endpoints changed on %s", datetime.now())
self.on.endpoints_changed.emit(event.relation, app=event.app, unit=event.unit)
# Emit the aliased event (if any).
self._emit_aliased_event(event, "endpoints_changed")
# To avoid unnecessary application restarts do not trigger
# “read_only_endpoints_changed“ event if “endpoints_changed“ is triggered.
return
# Emit a read only endpoints changed event if the database
# added or changed this info in the relation databag.
if "read-only-endpoints" in diff.added or "read-only-endpoints" in diff.changed:
# Emit the default event (the one without an alias).
logger.info("read-only-endpoints changed on %s", datetime.now())
self.on.read_only_endpoints_changed.emit(
event.relation, app=event.app, unit=event.unit
)
# Emit the aliased event (if any).
self._emit_aliased_event(event, "read_only_endpoints_changed")
@property
def relations(self) -> List[Relation]:
"""The list of Relation instances associated with this relation_name."""
return list(self.charm.model.relations[self.relation_name])

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@ -0,0 +1,418 @@
"""CloudCredentialsProvides and Requires module.
This library contains the Requires and Provides classes for handling
the cloud_credentials interface.
Import `CloudCredentialsRequires` in your charm, with the charm object and the
relation name:
- self
- "cloud_credentials"
Also provide additional parameters to the charm object:
- service
- internal_url
- public_url
- admin_url
- region
- username
- vhost
Two events are also available to respond to:
- connected
- ready
- goneaway
A basic example showing the usage of this relation follows:
```
from charms.keystone_k8s.v0.cloud_credentials import CloudCredentialsRequires
class CloudCredentialsClientCharm(CharmBase):
def __init__(self, *args):
super().__init__(*args)
# CloudCredentials Requires
self.cloud_credentials = CloudCredentialsRequires(
self, "cloud_credentials",
service = "my-service"
internal_url = "http://internal-url"
public_url = "http://public-url"
admin_url = "http://admin-url"
region = "region"
)
self.framework.observe(
self.cloud_credentials.on.connected, self._on_cloud_credentials_connected)
self.framework.observe(
self.cloud_credentials.on.ready, self._on_cloud_credentials_ready)
self.framework.observe(
self.cloud_credentials.on.goneaway, self._on_cloud_credentials_goneaway)
def _on_cloud_credentials_connected(self, event):
'''React to the CloudCredentials connected event.
This event happens when n CloudCredentials relation is added to the
model before credentials etc have been provided.
'''
# Do something before the relation is complete
pass
def _on_cloud_credentials_ready(self, event):
'''React to the CloudCredentials ready event.
The CloudCredentials interface will use the provided config for the
request to the identity server.
'''
# CloudCredentials Relation is ready. Do something with the completed relation.
pass
def _on_cloud_credentials_goneaway(self, event):
'''React to the CloudCredentials goneaway event.
This event happens when an CloudCredentials relation is removed.
'''
# CloudCredentials Relation has goneaway. shutdown services or suchlike
pass
```
"""
import logging
from ops.framework import (
StoredState,
EventBase,
ObjectEvents,
EventSource,
Object,
)
from ops.model import Relation
# The unique Charmhub library identifier, never change it
LIBID = "a5d96cc2686c47eea554ce2210c2d24e"
# Increment this major API version when introducing breaking changes
LIBAPI = 0
# Increment this PATCH version before using `charmcraft publish-lib` or reset
# to 0 if you are raising the major API version
LIBPATCH = 2
logger = logging.getLogger(__name__)
class CloudCredentialsConnectedEvent(EventBase):
"""CloudCredentials connected Event."""
pass
class CloudCredentialsReadyEvent(EventBase):
"""CloudCredentials ready for use Event."""
pass
class CloudCredentialsGoneAwayEvent(EventBase):
"""CloudCredentials relation has gone-away Event"""
pass
class CloudCredentialsServerEvents(ObjectEvents):
"""Events class for `on`"""
connected = EventSource(CloudCredentialsConnectedEvent)
ready = EventSource(CloudCredentialsReadyEvent)
goneaway = EventSource(CloudCredentialsGoneAwayEvent)
class CloudCredentialsRequires(Object):
"""
CloudCredentialsRequires class
"""
on = CloudCredentialsServerEvents()
_stored = StoredState()
def __init__(self, charm, relation_name: str):
super().__init__(charm, relation_name)
self.charm = charm
self.relation_name = relation_name
self.framework.observe(
self.charm.on[relation_name].relation_joined,
self._on_cloud_credentials_relation_joined,
)
self.framework.observe(
self.charm.on[relation_name].relation_changed,
self._on_cloud_credentials_relation_changed,
)
self.framework.observe(
self.charm.on[relation_name].relation_departed,
self._on_cloud_credentials_relation_changed,
)
self.framework.observe(
self.charm.on[relation_name].relation_broken,
self._on_cloud_credentials_relation_broken,
)
def _on_cloud_credentials_relation_joined(self, event):
"""CloudCredentials relation joined."""
logging.debug("CloudCredentials on_joined")
self.on.connected.emit()
self.request_credentials()
def _on_cloud_credentials_relation_changed(self, event):
"""CloudCredentials relation changed."""
logging.debug("CloudCredentials on_changed")
try:
self.on.ready.emit()
except (AttributeError, KeyError):
logger.exception('Error when emitting event')
def _on_cloud_credentials_relation_broken(self, event):
"""CloudCredentials relation broken."""
logging.debug("CloudCredentials on_broken")
self.on.goneaway.emit()
@property
def _cloud_credentials_rel(self) -> Relation:
"""The CloudCredentials relation."""
return self.framework.model.get_relation(self.relation_name)
def get_remote_app_data(self, key: str) -> str:
"""Return the value for the given key from remote app data."""
data = self._cloud_credentials_rel.data[self._cloud_credentials_rel.app]
return data.get(key)
@property
def api_version(self) -> str:
"""Return the api_version."""
return self.get_remote_app_data('api-version')
@property
def auth_host(self) -> str:
"""Return the auth_host."""
return self.get_remote_app_data('auth-host')
@property
def auth_port(self) -> str:
"""Return the auth_port."""
return self.get_remote_app_data('auth-port')
@property
def auth_protocol(self) -> str:
"""Return the auth_protocol."""
return self.get_remote_app_data('auth-protocol')
@property
def internal_host(self) -> str:
"""Return the internal_host."""
return self.get_remote_app_data('internal-host')
@property
def internal_port(self) -> str:
"""Return the internal_port."""
return self.get_remote_app_data('internal-port')
@property
def internal_protocol(self) -> str:
"""Return the internal_protocol."""
return self.get_remote_app_data('internal-protocol')
@property
def username(self) -> str:
"""Return the username."""
return self.get_remote_app_data('username')
@property
def password(self) -> str:
"""Return the password."""
return self.get_remote_app_data('password')
@property
def project_name(self) -> str:
"""Return the project name."""
return self.get_remote_app_data('project-name')
@property
def project_id(self) -> str:
"""Return the project id."""
return self.get_remote_app_data('project-id')
@property
def user_domain_name(self) -> str:
"""Return the name of the user domain."""
return self.get_remote_app_data('user-domain-name')
@property
def user_domain_id(self) -> str:
"""Return the id of the user domain."""
return self.get_remote_app_data('user-domain-id')
@property
def project_domain_name(self) -> str:
"""Return the name of the project domain."""
return self.get_remote_app_data('project-domain-name')
@property
def project_domain_id(self) -> str:
"""Return the id of the project domain."""
return self.get_remote_app_data('project-domain-id')
@property
def region(self) -> str:
"""Return the region for the auth urls."""
return self.get_remote_app_data('region')
def request_credentials(self) -> None:
"""Request credentials from the CloudCredentials server."""
if self.model.unit.is_leader():
logging.debug(f'Requesting credentials for {self.charm.app.name}')
app_data = self._cloud_credentials_rel.data[self.charm.app]
app_data['username'] = self.charm.app.name
class HasCloudCredentialsClientsEvent(EventBase):
"""Has CloudCredentialsClients Event."""
pass
class ReadyCloudCredentialsClientsEvent(EventBase):
"""CloudCredentialsClients Ready Event."""
def __init__(self, handle, relation_id, relation_name, username):
super().__init__(handle)
self.relation_id = relation_id
self.relation_name = relation_name
self.username = username
def snapshot(self):
return {
"relation_id": self.relation_id,
"relation_name": self.relation_name,
"username": self.username,
}
def restore(self, snapshot):
super().restore(snapshot)
self.relation_id = snapshot["relation_id"]
self.relation_name = snapshot["relation_name"]
self.username = snapshot["username"]
class CloudCredentialsClientsGoneAwayEvent(EventBase):
"""Has CloudCredentialsClientsGoneAwayEvent Event."""
pass
class CloudCredentialsClientEvents(ObjectEvents):
"""Events class for `on`"""
has_cloud_credentials_clients = EventSource(
HasCloudCredentialsClientsEvent
)
ready_cloud_credentials_clients = EventSource(
ReadyCloudCredentialsClientsEvent
)
cloud_credentials_clients_gone = EventSource(
CloudCredentialsClientsGoneAwayEvent
)
class CloudCredentialsProvides(Object):
"""
CloudCredentialsProvides class
"""
on = CloudCredentialsClientEvents()
_stored = StoredState()
def __init__(self, charm, relation_name):
super().__init__(charm, relation_name)
self.charm = charm
self.relation_name = relation_name
self.framework.observe(
self.charm.on[relation_name].relation_joined,
self._on_cloud_credentials_relation_joined,
)
self.framework.observe(
self.charm.on[relation_name].relation_changed,
self._on_cloud_credentials_relation_changed,
)
self.framework.observe(
self.charm.on[relation_name].relation_broken,
self._on_cloud_credentials_relation_broken,
)
def _on_cloud_credentials_relation_joined(self, event):
"""Handle CloudCredentials joined."""
logging.debug("CloudCredentialsProvides on_joined")
self.on.has_cloud_credentials_clients.emit()
def _on_cloud_credentials_relation_changed(self, event):
"""Handle CloudCredentials changed."""
logging.debug("CloudCredentials on_changed")
REQUIRED_KEYS = ['username']
values = [
event.relation.data[event.relation.app].get(k)
for k in REQUIRED_KEYS
]
# Validate data on the relation
if all(values):
username = event.relation.data[event.relation.app]['username']
self.on.ready_cloud_credentials_clients.emit(
event.relation.id,
event.relation.name,
username,
)
def _on_cloud_credentials_relation_broken(self, event):
"""Handle CloudCredentials broken."""
logging.debug("CloudCredentialsProvides on_departed")
self.on.cloud_credentials_clients_gone.emit()
def set_cloud_credentials(self, relation_name: int,
relation_id: str,
api_version: str,
auth_host: str,
auth_port: str,
auth_protocol: str,
internal_host: str,
internal_port: str,
internal_protocol: str,
username: str,
password: str,
project_name: str,
project_id: str,
user_domain_name: str,
user_domain_id: str,
project_domain_name: str,
project_domain_id: str,
region: str):
logging.debug("Setting cloud_credentials connection information.")
_cloud_credentials_rel = None
for relation in self.framework.model.relations[relation_name]:
if relation.id == relation_id:
_cloud_credentials_rel = relation
if not _cloud_credentials_rel:
# Relation has disappeared so don't send the data
return
app_data = _cloud_credentials_rel.data[self.charm.app]
app_data["api-version"] = api_version
app_data["auth-host"] = auth_host
app_data["auth-port"] = str(auth_port)
app_data["auth-protocol"] = auth_protocol
app_data["internal-host"] = internal_host
app_data["internal-port"] = str(internal_port)
app_data["internal-protocol"] = internal_protocol
app_data["username"] = username
app_data["password"] = password
app_data["project-name"] = project_name
app_data["project-id"] = project_id
app_data["user-domain-name"] = user_domain_name
app_data["user-domain-id"] = user_domain_id
app_data["project-domain-name"] = project_domain_name
app_data["project-domain-id"] = project_domain_id
app_data["region"] = region

439
lib/charms/keystone_k8s/v0/identity_credentials.py Normal file
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@ -0,0 +1,439 @@
"""IdentityCredentialsProvides and Requires module.
This library contains the Requires and Provides classes for handling
the identity_credentials interface.
Import `IdentityCredentialsRequires` in your charm, with the charm object and the
relation name:
- self
- "identity_credentials"
Also provide additional parameters to the charm object:
- service
- internal_url
- public_url
- admin_url
- region
- username
- vhost
Two events are also available to respond to:
- connected
- ready
- goneaway
A basic example showing the usage of this relation follows:
```
from charms.keystone_k8s.v0.identity_credentials import IdentityCredentialsRequires
class IdentityCredentialsClientCharm(CharmBase):
def __init__(self, *args):
super().__init__(*args)
# IdentityCredentials Requires
self.identity_credentials = IdentityCredentialsRequires(
self, "identity_credentials",
service = "my-service"
internal_url = "http://internal-url"
public_url = "http://public-url"
admin_url = "http://admin-url"
region = "region"
)
self.framework.observe(
self.identity_credentials.on.connected, self._on_identity_credentials_connected)
self.framework.observe(
self.identity_credentials.on.ready, self._on_identity_credentials_ready)
self.framework.observe(
self.identity_credentials.on.goneaway, self._on_identity_credentials_goneaway)
def _on_identity_credentials_connected(self, event):
'''React to the IdentityCredentials connected event.
This event happens when IdentityCredentials relation is added to the
model before credentials etc have been provided.
'''
# Do something before the relation is complete
pass
def _on_identity_credentials_ready(self, event):
'''React to the IdentityCredentials ready event.
The IdentityCredentials interface will use the provided config for the
request to the identity server.
'''
# IdentityCredentials Relation is ready. Do something with the completed relation.
pass
def _on_identity_credentials_goneaway(self, event):
'''React to the IdentityCredentials goneaway event.
This event happens when an IdentityCredentials relation is removed.
'''
# IdentityCredentials Relation has goneaway. shutdown services or suchlike
pass
```
"""
import logging
from ops.framework import (
StoredState,
EventBase,
ObjectEvents,
EventSource,
Object,
)
from ops.model import (
Relation,
SecretNotFoundError,
)
# The unique Charmhub library identifier, never change it
LIBID = "b5fa18d4427c4ab9a269c3a2fbed545c"
# Increment this major API version when introducing breaking changes
LIBAPI = 0
# Increment this PATCH version before using `charmcraft publish-lib` or reset
# to 0 if you are raising the major API version
LIBPATCH = 1
logger = logging.getLogger(__name__)
class IdentityCredentialsConnectedEvent(EventBase):
"""IdentityCredentials connected Event."""
pass
class IdentityCredentialsReadyEvent(EventBase):
"""IdentityCredentials ready for use Event."""
pass
class IdentityCredentialsGoneAwayEvent(EventBase):
"""IdentityCredentials relation has gone-away Event"""
pass
class IdentityCredentialsServerEvents(ObjectEvents):
"""Events class for `on`"""
connected = EventSource(IdentityCredentialsConnectedEvent)
ready = EventSource(IdentityCredentialsReadyEvent)
goneaway = EventSource(IdentityCredentialsGoneAwayEvent)
class IdentityCredentialsRequires(Object):
"""
IdentityCredentialsRequires class
"""
on = IdentityCredentialsServerEvents()
_stored = StoredState()
def __init__(self, charm, relation_name: str):
super().__init__(charm, relation_name)
self.charm = charm
self.relation_name = relation_name
self.framework.observe(
self.charm.on[relation_name].relation_joined,
self._on_identity_credentials_relation_joined,
)
self.framework.observe(
self.charm.on[relation_name].relation_changed,
self._on_identity_credentials_relation_changed,
)
self.framework.observe(
self.charm.on[relation_name].relation_departed,
self._on_identity_credentials_relation_changed,
)
self.framework.observe(
self.charm.on[relation_name].relation_broken,
self._on_identity_credentials_relation_broken,
)
def _on_identity_credentials_relation_joined(self, event):
"""IdentityCredentials relation joined."""
logging.debug("IdentityCredentials on_joined")
self.on.connected.emit()
self.request_credentials()
def _on_identity_credentials_relation_changed(self, event):
"""IdentityCredentials relation changed."""
logging.debug("IdentityCredentials on_changed")
try:
self.on.ready.emit()
except (AttributeError, KeyError):
logger.exception('Error when emitting event')
def _on_identity_credentials_relation_broken(self, event):
"""IdentityCredentials relation broken."""
logging.debug("IdentityCredentials on_broken")
self.on.goneaway.emit()
@property
def _identity_credentials_rel(self) -> Relation:
"""The IdentityCredentials relation."""
return self.framework.model.get_relation(self.relation_name)
def get_remote_app_data(self, key: str) -> str:
"""Return the value for the given key from remote app data."""
data = self._identity_credentials_rel.data[self._identity_credentials_rel.app]
return data.get(key)
@property
def api_version(self) -> str:
"""Return the api_version."""
return self.get_remote_app_data('api-version')
@property
def auth_host(self) -> str:
"""Return the auth_host."""
return self.get_remote_app_data('auth-host')
@property
def auth_port(self) -> str:
"""Return the auth_port."""
return self.get_remote_app_data('auth-port')
@property
def auth_protocol(self) -> str:
"""Return the auth_protocol."""
return self.get_remote_app_data('auth-protocol')
@property
def internal_host(self) -> str:
"""Return the internal_host."""
return self.get_remote_app_data('internal-host')
@property
def internal_port(self) -> str:
"""Return the internal_port."""
return self.get_remote_app_data('internal-port')
@property
def internal_protocol(self) -> str:
"""Return the internal_protocol."""
return self.get_remote_app_data('internal-protocol')
@property
def credentials(self) -> str:
return self.get_remote_app_data('credentials')
@property
def username(self) -> str:
credentials_id = self.get_remote_app_data('credentials')
if not credentials_id:
return None
try:
credentials = self.charm.model.get_secret(id=credentials_id)
return credentials.get_content().get("username")
except SecretNotFoundError:
logger.warning(f"Secret {credentials_id} not found")
return None
@property
def password(self) -> str:
credentials_id = self.get_remote_app_data('credentials')
if not credentials_id:
return None
try:
credentials = self.charm.model.get_secret(id=credentials_id)
return credentials.get_content().get("password")
except SecretNotFoundError:
logger.warning(f"Secret {credentials_id} not found")
return None
@property
def project_name(self) -> str:
"""Return the project name."""
return self.get_remote_app_data('project-name')
@property
def project_id(self) -> str:
"""Return the project id."""
return self.get_remote_app_data('project-id')
@property
def user_domain_name(self) -> str:
"""Return the name of the user domain."""
return self.get_remote_app_data('user-domain-name')
@property
def user_domain_id(self) -> str:
"""Return the id of the user domain."""
return self.get_remote_app_data('user-domain-id')
@property
def project_domain_name(self) -> str:
"""Return the name of the project domain."""
return self.get_remote_app_data('project-domain-name')
@property
def project_domain_id(self) -> str:
"""Return the id of the project domain."""
return self.get_remote_app_data('project-domain-id')
@property
def region(self) -> str:
"""Return the region for the auth urls."""
return self.get_remote_app_data('region')
def request_credentials(self) -> None:
"""Request credentials from the IdentityCredentials server."""
if self.model.unit.is_leader():
logging.debug(f'Requesting credentials for {self.charm.app.name}')
app_data = self._identity_credentials_rel.data[self.charm.app]
app_data['username'] = self.charm.app.name
class HasIdentityCredentialsClientsEvent(EventBase):
"""Has IdentityCredentialsClients Event."""
pass
class ReadyIdentityCredentialsClientsEvent(EventBase):
"""IdentityCredentialsClients Ready Event."""
def __init__(self, handle, relation_id, relation_name, username):
super().__init__(handle)
self.relation_id = relation_id
self.relation_name = relation_name
self.username = username
def snapshot(self):
return {
"relation_id": self.relation_id,
"relation_name": self.relation_name,
"username": self.username,
}
def restore(self, snapshot):
super().restore(snapshot)
self.relation_id = snapshot["relation_id"]
self.relation_name = snapshot["relation_name"]
self.username = snapshot["username"]
class IdentityCredentialsClientsGoneAwayEvent(EventBase):
"""Has IdentityCredentialsClientsGoneAwayEvent Event."""
pass
class IdentityCredentialsClientEvents(</