Update kubernetes_service_patch to v1
v1 of the kubernetes_service_patch lib will patches the service definition on `status_update` event. This helps when Juju refreshes the patched services to their initial state. Depends-On: https://review.opendev.org/c/openstack/charm-ops-sunbeam/+/880270 Change-Id: I44ee58cb9f5ddee6339bcd207365a2dcb49ac006 Signed-off-by: Guillaume Boutry <guillaume.boutry@canonical.com>
This commit is contained in:
Guillaume Boutry
parent
294e26135c
commit
069a9daca6
@ -1,6 +1,6 @@
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#!/bin/bash
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echo "INFO: Fetching libs from charmhub."
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charmcraft fetch-lib charms.observability_libs.v0.kubernetes_service_patch
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charmcraft fetch-lib charms.observability_libs.v1.kubernetes_service_patch
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charmcraft fetch-lib charms.ovn_central_k8s.v0.ovsdb
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charmcraft fetch-lib charms.tls_certificates_interface.v1.tls_certificates
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@ -9,21 +9,20 @@ service named after the application in the namespace (named after the Juju model
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default contains a "placeholder" port, which is 65536/TCP.
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When modifying the default set of resources managed by Juju, one must consider the lifecycle of the
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charm. In this case, any modifications to the default service (created during deployment), will
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be overwritten during a charm upgrade.
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charm. In this case, any modifications to the default service (created during deployment), will be
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overwritten during a charm upgrade.
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When initialised, this library binds a handler to the parent charm's `install` and `upgrade_charm`
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events which applies the patch to the cluster. This should ensure that the service ports are
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correct throughout the charm's life.
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The constructor simply takes a reference to the parent charm, and a list of tuples that each define
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a port for the service, where each tuple contains:
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The constructor simply takes a reference to the parent charm, and a list of
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[`lightkube`](https://github.com/gtsystem/lightkube) ServicePorts that each define a port for the
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service. For information regarding the `lightkube` `ServicePort` model, please visit the
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`lightkube` [docs](https://gtsystem.github.io/lightkube-models/1.23/models/core_v1/#serviceport).
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- a name for the port
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- port for the service to listen on
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- optionally: a targetPort for the service (the port in the container!)
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- optionally: a nodePort for the service (for NodePort or LoadBalancer services only!)
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- optionally: a name of the service (in case service name needs to be patched as well)
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Optionally, a name of the service (in case service name needs to be patched as well), labels,
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selectors, and annotations can be provided as keyword arguments.
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## Getting Started
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@ -32,8 +31,8 @@ that you also need to add `lightkube` and `lightkube-models` to your charm's `re
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```shell
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cd some-charm
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charmcraft fetch-lib charms.observability_libs.v0.kubernetes_service_patch
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echo <<-EOF >> requirements.txt
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charmcraft fetch-lib charms.observability_libs.v1.kubernetes_service_patch
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cat << EOF >> requirements.txt
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lightkube
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lightkube-models
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EOF
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@ -41,28 +40,71 @@ EOF
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Then, to initialise the library:
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For ClusterIP services:
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For `ClusterIP` services:
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```python
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# ...
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from charms.observability_libs.v0.kubernetes_service_patch import KubernetesServicePatch
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from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch
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from lightkube.models.core_v1 import ServicePort
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class SomeCharm(CharmBase):
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def __init__(self, *args):
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# ...
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self.service_patcher = KubernetesServicePatch(self, [(f"{self.app.name}", 8080)])
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port = ServicePort(443, name=f"{self.app.name}")
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self.service_patcher = KubernetesServicePatch(self, [port])
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# ...
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```
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For LoadBalancer/NodePort services:
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For `LoadBalancer`/`NodePort` services:
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```python
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# ...
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from charms.observability_libs.v0.kubernetes_service_patch import KubernetesServicePatch
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from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch
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from lightkube.models.core_v1 import ServicePort
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class SomeCharm(CharmBase):
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def __init__(self, *args):
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# ...
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port = ServicePort(443, name=f"{self.app.name}", targetPort=443, nodePort=30666)
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self.service_patcher = KubernetesServicePatch(
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self, [(f"{self.app.name}", 443, 443, 30666)], "LoadBalancer"
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self, [port], "LoadBalancer"
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)
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# ...
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```
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Port protocols can also be specified. Valid protocols are `"TCP"`, `"UDP"`, and `"SCTP"`
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```python
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# ...
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from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch
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from lightkube.models.core_v1 import ServicePort
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class SomeCharm(CharmBase):
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def __init__(self, *args):
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# ...
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tcp = ServicePort(443, name=f"{self.app.name}-tcp", protocol="TCP")
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udp = ServicePort(443, name=f"{self.app.name}-udp", protocol="UDP")
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sctp = ServicePort(443, name=f"{self.app.name}-sctp", protocol="SCTP")
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self.service_patcher = KubernetesServicePatch(self, [tcp, udp, sctp])
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# ...
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```
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Bound with custom events by providing `refresh_event` argument:
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For example, you would like to have a configurable port in your charm and want to apply
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service patch every time charm config is changed.
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```python
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from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch
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from lightkube.models.core_v1 import ServicePort
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class SomeCharm(CharmBase):
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def __init__(self, *args):
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# ...
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port = ServicePort(int(self.config["charm-config-port"]), name=f"{self.app.name}")
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self.service_patcher = KubernetesServicePatch(
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self,
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[port],
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refresh_event=self.on.config_changed
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)
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# ...
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```
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@ -83,15 +125,16 @@ def setUp(self, *unused):
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import logging
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from types import MethodType
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from typing import Literal, Sequence, Tuple, Union
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from typing import List, Literal, Optional, Union
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from lightkube import ApiError, Client
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from lightkube.core import exceptions
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from lightkube.models.core_v1 import ServicePort, ServiceSpec
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from lightkube.models.meta_v1 import ObjectMeta
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from lightkube.resources.core_v1 import Service
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from lightkube.types import PatchType
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from ops.charm import CharmBase
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from ops.framework import Object
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from ops.framework import BoundEvent, Object
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logger = logging.getLogger(__name__)
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@ -99,13 +142,12 @@ logger = logging.getLogger(__name__)
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LIBID = "0042f86d0a874435adef581806cddbbb"
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# Increment this major API version when introducing breaking changes
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LIBAPI = 0
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LIBAPI = 1
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# Increment this PATCH version before using `charmcraft publish-lib` or reset
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# to 0 if you are raising the major API version
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LIBPATCH = 6
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PortDefinition = Union[Tuple[str, int], Tuple[str, int, int], Tuple[str, int, int, int]]
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ServiceType = Literal["ClusterIP", "LoadBalancer"]
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@ -115,18 +157,20 @@ class KubernetesServicePatch(Object):
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def __init__(
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self,
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charm: CharmBase,
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ports: Sequence[PortDefinition],
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service_name: str = None,
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ports: List[ServicePort],
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service_name: Optional[str] = None,
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service_type: ServiceType = "ClusterIP",
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additional_labels: dict = None,
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additional_selectors: dict = None,
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additional_annotations: dict = None,
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additional_labels: Optional[dict] = None,
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additional_selectors: Optional[dict] = None,
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additional_annotations: Optional[dict] = None,
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*,
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refresh_event: Optional[Union[BoundEvent, List[BoundEvent]]] = None,
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):
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"""Constructor for KubernetesServicePatch.
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Args:
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charm: the charm that is instantiating the library.
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ports: a list of tuples (name, port, targetPort, nodePort) for every service port.
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ports: a list of ServicePorts
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service_name: allows setting custom name to the patched service. If none given,
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application name will be used.
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service_type: desired type of K8s service. Default value is in line with ServiceSpec's
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@ -136,6 +180,9 @@ class KubernetesServicePatch(Object):
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additional_selectors: Selectors to be added to the kubernetes service (by default only
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"app.kubernetes.io/name" is set to the service name)
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additional_annotations: Annotations to be added to the kubernetes service.
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refresh_event: an optional bound event or list of bound events which
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will be observed to re-apply the patch (e.g. on port change).
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The `install` and `upgrade-charm` events would be observed regardless.
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"""
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super().__init__(charm, "kubernetes-service-patch")
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self.charm = charm
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@ -154,23 +201,29 @@ class KubernetesServicePatch(Object):
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# Ensure this patch is applied during the 'install' and 'upgrade-charm' events
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self.framework.observe(charm.on.install, self._patch)
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self.framework.observe(charm.on.upgrade_charm, self._patch)
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self.framework.observe(charm.on.update_status, self._patch)
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# apply user defined events
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if refresh_event:
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if not isinstance(refresh_event, list):
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refresh_event = [refresh_event]
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for evt in refresh_event:
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self.framework.observe(evt, self._patch)
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def _service_object(
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self,
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ports: Sequence[PortDefinition],
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service_name: str = None,
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ports: List[ServicePort],
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service_name: Optional[str] = None,
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service_type: ServiceType = "ClusterIP",
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additional_labels: dict = None,
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additional_selectors: dict = None,
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additional_annotations: dict = None,
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additional_labels: Optional[dict] = None,
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additional_selectors: Optional[dict] = None,
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additional_annotations: Optional[dict] = None,
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) -> Service:
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"""Creates a valid Service representation.
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Args:
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ports: a list of tuples of the form (name, port) or (name, port, targetPort)
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or (name, port, targetPort, nodePort) for every service port. If the 'targetPort'
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is omitted, it is assumed to be equal to 'port', with the exception of NodePort
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and LoadBalancer services, where all port numbers have to be specified.
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ports: a list of ServicePorts
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service_name: allows setting custom name to the patched service. If none given,
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application name will be used.
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service_type: desired type of K8s service. Default value is in line with ServiceSpec's
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@ -203,15 +256,7 @@ class KubernetesServicePatch(Object):
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),
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spec=ServiceSpec(
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selector=selector,
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ports=[
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ServicePort(
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name=p[0],
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port=p[1],
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targetPort=p[2] if len(p) > 2 else p[1], # type: ignore[misc]
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nodePort=p[3] if len(p) > 3 else None, # type: ignore[arg-type, misc]
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)
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for p in ports
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],
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ports=ports,
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type=service_type,
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),
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)
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@ -222,11 +267,15 @@ class KubernetesServicePatch(Object):
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Raises:
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PatchFailed: if patching fails due to lack of permissions, or otherwise.
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"""
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if not self.charm.unit.is_leader():
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try:
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client = Client()
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except exceptions.ConfigError as e:
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logger.warning("Error creating k8s client: %s", e)
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return
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client = Client()
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try:
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if self._is_patched(client):
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return
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if self.service_name != self._app:
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self._delete_and_create_service(client)
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client.patch(Service, self.service_name, self.service, patch_type=PatchType.MERGE)
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@ -252,12 +301,25 @@ class KubernetesServicePatch(Object):
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bool: A boolean indicating if the service patch has been applied.
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"""
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client = Client()
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return self._is_patched(client)
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def _is_patched(self, client: Client) -> bool:
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# Get the relevant service from the cluster
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service = client.get(Service, name=self.service_name, namespace=self._namespace)
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try:
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service = client.get(Service, name=self.service_name, namespace=self._namespace)
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except ApiError as e:
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if e.status.code == 404 and self.service_name != self._app:
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return False
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else:
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logger.error("Kubernetes service get failed: %s", str(e))
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raise
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# Construct a list of expected ports, should the patch be applied
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expected_ports = [(p.port, p.targetPort) for p in self.service.spec.ports]
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# Construct a list in the same manner, using the fetched service
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fetched_ports = [(p.port, p.targetPort) for p in service.spec.ports] # type: ignore[attr-defined] # noqa: E501
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fetched_ports = [
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(p.port, p.targetPort) for p in service.spec.ports # type: ignore[attr-defined]
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] # noqa: E501
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return expected_ports == fetched_ports
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@property
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@ -42,9 +42,12 @@ import ops_sunbeam.ovn.config_contexts as ovn_ctxts
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import ops_sunbeam.ovn.container_handlers as ovn_chandlers
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import ops_sunbeam.ovn.relation_handlers as ovn_relation_handlers
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import ops_sunbeam.relation_handlers as sunbeam_rhandlers
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from charms.observability_libs.v0.kubernetes_service_patch import (
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from charms.observability_libs.v1.kubernetes_service_patch import (
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KubernetesServicePatch,
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)
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from lightkube.models.core_v1 import (
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ServicePort,
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)
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from ops.main import (
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main,
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)
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@ -97,9 +100,7 @@ class OVNRelayOperatorCharm(ovn_charm.OSBaseOVNOperatorCharm):
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super().__init__(framework)
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self.service_patcher = KubernetesServicePatch(
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self,
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[
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("southbound", 6642),
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],
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[ServicePort(6642, name="southbound")],
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service_type="LoadBalancer",
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)
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self.framework.observe(
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