Add BMC subscription CRD and reconciler

This patch implements the fast eventing API:

metal3-io/metal3-docs#167

We introduce a new CRD, and a new reconciler.  We use the Ironic API to
communicate with the BMC to manage node subscriptions.

apis/metal3.io/v1alpha1/bmceventsubscription_types.go

@@ -0,0 +1,92 @@
+/*
+
+
+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.
+*/
+
+package v1alpha1
+
+import (
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+const (
+
+	// BMCEventSubscriptionFinalizer is the name of the finalizer added to
+	// subscriptions to block delete operations until the subscription is removed
+	// from the BMC.
+	BMCEventSubscriptionFinalizer string = "bmceventsubscription.metal3.io"
+)
+
+type BMCEventSubscriptionSpec struct {
+	Taints []corev1.Taint `json:"taints,omitempty"`
+
+	// A reference to a BareMetalHost
+	HostRef string `json:"hostRef,omitempty"`
+
+	// A webhook URL to send events to
+	Destination string `json:"destination,omitempty"`
+
+	// Arbitrary user-provided context for the event
+	Context string `json:"context,omitempty"`
+
+	// Messages of which type we should pass along; defaults to ["Alert"]
+	EventTypes []string `json:"eventTypes,omitempty"`
+
+	// The BMC protocol to use; defaults to "Redfish"
+	Protocol string `json:"protocol,omitempty"`
+
+	// A secret containing HTTP headers which should be passed along to the Destination
+	// when making a request
+	HTTPHeadersRef *corev1.SecretReference `json:"httpHeadersRef,omitempty"`
+}
+
+type BMCEventSubscriptionStatus struct {
+	SubscriptionID string `json:"subscriptionID,omitempty"`
+	ErrorMessage   string `json:"errorMessage"`
+	// ErrorCount records how many times the host has encoutered an error since the last successful operation
+	// +kubebuilder:default:=0
+	ErrorCount int `json:"errorCount"`
+	// LastUpdated identifies when this status was last observed.
+	// +optional
+	LastUpdated *metav1.Time `json:"lastUpdated,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+//
+// BMCEventSubscription is the Schema for the ...
+// +k8s:openapi-gen=true
+// +kubebuilder:resource:shortName=bes;bmcevent
+// +kubebuilder:subresource:status
+// +kubebuilder:object:root=true
+type BMCEventSubscription struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec   BMCEventSubscriptionSpec   `json:"spec,omitempty"`
+	Status BMCEventSubscriptionStatus `json:"status,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// BareMetalHostList contains a list of BareMetalHost
+type BMCEventSubscriptionList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []BMCEventSubscription `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&BMCEventSubscription{}, &BMCEventSubscriptionList{})
+}

config/crd/bases/metal3.io_bmceventsubscriptions.yaml

@@ -0,0 +1,128 @@
+
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.6.2
+  creationTimestamp: null
+  name: bmceventsubscriptions.metal3.io
+spec:
+  group: metal3.io
+  names:
+    kind: BMCEventSubscription
+    listKind: BMCEventSubscriptionList
+    plural: bmceventsubscriptions
+    shortNames:
+    - bes
+    - bmcevent
+    singular: bmceventsubscription
+  scope: Namespaced
+  versions:
+  - name: v1alpha1
+    schema:
+      openAPIV3Schema:
+        description: BMCEventSubscription is the Schema for the ...
+        properties:
+          apiVersion:
+            description: 'APIVersion defines the versioned schema of this representation
+              of an object. Servers should convert recognized schemas to the latest
+              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+            type: string
+          kind:
+            description: 'Kind is a string value representing the REST resource this
+              object represents. Servers may infer this from the endpoint the client
+              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+            type: string
+          metadata:
+            type: object
+          spec:
+            properties:
+              context:
+                description: Arbitrary user-provided context for the event
+                type: string
+              destination:
+                description: A webhook URL to send events to
+                type: string
+              eventTypes:
+                description: Messages of which type we should pass along; defaults
+                  to ["Alert"]
+                items:
+                  type: string
+                type: array
+              hostRef:
+                description: A reference to a BareMetalHost
+                type: string
+              httpHeadersRef:
+                description: A secret containing HTTP headers which should be passed
+                  along to the Destination when making a request
+                properties:
+                  name:
+                    description: Name is unique within a namespace to reference a
+                      secret resource.
+                    type: string
+                  namespace:
+                    description: Namespace defines the space within which the secret
+                      name must be unique.
+                    type: string
+                type: object
+              protocol:
+                description: The BMC protocol to use; defaults to "Redfish"
+                type: string
+              taints:
+                items:
+                  description: The node this Taint is attached to has the "effect"
+                    on any pod that does not tolerate the Taint.
+                  properties:
+                    effect:
+                      description: Required. The effect of the taint on pods that
+                        do not tolerate the taint. Valid effects are NoSchedule, PreferNoSchedule
+                        and NoExecute.
+                      type: string
+                    key:
+                      description: Required. The taint key to be applied to a node.
+                      type: string
+                    timeAdded:
+                      description: TimeAdded represents the time at which the taint
+                        was added. It is only written for NoExecute taints.
+                      format: date-time
+                      type: string
+                    value:
+                      description: The taint value corresponding to the taint key.
+                      type: string
+                  required:
+                  - effect
+                  - key
+                  type: object
+                type: array
+            type: object
+          status:
+            properties:
+              errorCount:
+                default: 0
+                description: ErrorCount records how many times the host has encoutered
+                  an error since the last successful operation
+                type: integer
+              errorMessage:
+                type: string
+              lastUpdated:
+                description: LastUpdated identifies when this status was last observed.
+                format: date-time
+                type: string
+              subscriptionID:
+                type: string
+            required:
+            - errorCount
+            - errorMessage
+            type: object
+        type: object
+    served: true
+    storage: true
+    subresources:
+      status: {}
+status:
+  acceptedNames:
+    kind: ""
+    plural: ""
+  conditions: []
+  storedVersions: []

config/crd/kustomization.yaml

@@ -6,6 +6,7 @@ resources:
 - bases/metal3.io_hostfirmwaresettings.yaml
 - bases/metal3.io_firmwareschemas.yaml
 - bases/metal3.io_preprovisioningimages.yaml
+- bases/metal3.io_bmceventsubscriptions.yaml
 # +kubebuilder:scaffold:crdkustomizeresource
 
 patchesStrategicMerge: