cloudfoundry/cf-k8s-controllers

/*
Copyright 2021.

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 controllers

import (
    "context"
    "fmt"

    korifiv1alpha1 "code.cloudfoundry.org/korifi/controllers/api/v1alpha1"
    "code.cloudfoundry.org/korifi/tools/k8s"
    "github.com/go-logr/logr"
    buildv1alpha2 "github.com/pivotal/kpack/pkg/apis/build/v1alpha2"
    corev1alpha1 "github.com/pivotal/kpack/pkg/apis/core/v1alpha1"
    corev1 "k8s.io/api/core/v1"
    "k8s.io/apimachinery/pkg/api/meta"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/apimachinery/pkg/runtime"
    "k8s.io/apimachinery/pkg/types"
    ctrl "sigs.k8s.io/controller-runtime"
    "sigs.k8s.io/controller-runtime/pkg/builder"
    "sigs.k8s.io/controller-runtime/pkg/client"
    "sigs.k8s.io/controller-runtime/pkg/handler"
    "sigs.k8s.io/controller-runtime/pkg/predicate"
    "sigs.k8s.io/controller-runtime/pkg/reconcile"
)

const (
    BuilderInfoName    = "kpack-image-builder"
    ReadyConditionType = "Ready"
)

func NewBuilderInfoReconciler(
    c client.Client,
    scheme *runtime.Scheme,
    log logr.Logger,
    clusterBuilderName string,
    rootNamespaceName string,
) *k8s.PatchingReconciler[korifiv1alpha1.BuilderInfo, *korifiv1alpha1.BuilderInfo] {
    builderInfoReconciler := BuilderInfoReconciler{
        k8sClient:          c,
        scheme:             scheme,
        log:                log,
        clusterBuilderName: clusterBuilderName,
        rootNamespaceName:  rootNamespaceName,
    }
    return k8s.NewPatchingReconciler[korifiv1alpha1.BuilderInfo, *korifiv1alpha1.BuilderInfo](log, c, &builderInfoReconciler)
}

type BuilderInfoReconciler struct {
    k8sClient          client.Client
    scheme             *runtime.Scheme
    log                logr.Logger
    clusterBuilderName string
    rootNamespaceName  string
}

func (r *BuilderInfoReconciler) SetupWithManager(mgr ctrl.Manager) *builder.Builder {
    return ctrl.NewControllerManagedBy(mgr).
        For(&korifiv1alpha1.BuilderInfo{}).
        Watches(
            new(buildv1alpha2.ClusterBuilder),
            handler.EnqueueRequestsFromMapFunc(r.enqueueBuilderInfoRequests),
        ).
        WithEventFilter(predicate.NewPredicateFuncs(r.filterBuilderInfos))
}

func (r *BuilderInfoReconciler) enqueueBuilderInfoRequests(ctx context.Context, o client.Object) []reconcile.Request {
    var requests []reconcile.Request
    if o.GetName() == r.clusterBuilderName {
        requests = append(requests, reconcile.Request{
            NamespacedName: types.NamespacedName{
                Name:      BuilderInfoName,
                Namespace: r.rootNamespaceName,
            },
        })
    }
    return requests
}

func (r *BuilderInfoReconciler) filterBuilderInfos(object client.Object) bool {
    builderInfo, ok := object.(*korifiv1alpha1.BuilderInfo)
    if !ok {
        return true
    }

    return builderInfo.Name == BuilderInfoName && builderInfo.Namespace == r.rootNamespaceName
}

//+kubebuilder:rbac:groups=korifi.cloudfoundry.org,resources=builderinfos,verbs=get;list;watch;create;patch;delete
//+kubebuilder:rbac:groups=korifi.cloudfoundry.org,resources=builderinfos/status,verbs=get;patch

//+kubebuilder:rbac:groups=kpack.io,resources=clusterbuilders,verbs=get;list;watch
//+kubebuilder:rbac:groups=kpack.io,resources=clusterbuilders/status,verbs=get

func (r *BuilderInfoReconciler) ReconcileResource(ctx context.Context, info *korifiv1alpha1.BuilderInfo) (ctrl.Result, error) {
    log := logr.FromContextOrDiscard(ctx)

    info.Status.ObservedGeneration = info.Generation
    log.V(1).Info("set observed generation", "generation", info.Status.ObservedGeneration)

    clusterBuilder := new(buildv1alpha2.ClusterBuilder)
    err := r.k8sClient.Get(ctx, types.NamespacedName{Name: r.clusterBuilderName}, clusterBuilder)
    if err != nil {
        r.log.Info("error when fetching ClusterBuilder", "reason", err)

        info.Status.Stacks = []korifiv1alpha1.BuilderInfoStatusStack{}
        info.Status.Buildpacks = []korifiv1alpha1.BuilderInfoStatusBuildpack{}
        meta.SetStatusCondition(&info.Status.Conditions, metav1.Condition{
            Type:               ReadyConditionType,
            Status:             metav1.ConditionFalse,
            Reason:             "ClusterBuilderMissing",
            Message:            fmt.Sprintf("Error fetching ClusterBuilder %q: %s", r.clusterBuilderName, err),
            ObservedGeneration: info.Generation,
        })
        return ctrl.Result{}, err
    }

    updatedTimestamp := lastUpdatedTime(clusterBuilder.ObjectMeta)
    info.Status.Stacks = clusterBuilderToStacks(clusterBuilder, updatedTimestamp)
    info.Status.Buildpacks = clusterBuilderToBuildpacks(clusterBuilder, updatedTimestamp)

    clusterBuilderReadyCondition := clusterBuilder.Status.GetCondition(corev1alpha1.ConditionReady)
    if clusterBuilderReadyCondition != nil && clusterBuilderReadyCondition.Status == corev1.ConditionTrue {
        meta.SetStatusCondition(&info.Status.Conditions, metav1.Condition{
            Type:               ReadyConditionType,
            Status:             metav1.ConditionTrue,
            Reason:             "ClusterBuilderReady",
            Message:            fmt.Sprintf("ClusterBuilder %q is ready", r.clusterBuilderName),
            ObservedGeneration: info.Generation,
        })
    } else {
        var msg string
        if clusterBuilderReadyCondition != nil {
            msg = clusterBuilderReadyCondition.Message
        }

        if msg == "" {
            msg = "resource not reconciled"
        }

        meta.SetStatusCondition(&info.Status.Conditions, metav1.Condition{
            Type:               ReadyConditionType,
            Status:             metav1.ConditionFalse,
            Reason:             "ClusterBuilderNotReady",
            Message:            fmt.Sprintf("ClusterBuilder %q is not ready: %s", r.clusterBuilderName, msg),
            ObservedGeneration: info.Generation,
        })
    }

    return ctrl.Result{}, nil
}

func clusterBuilderToStacks(clusterBuilder *buildv1alpha2.ClusterBuilder, updatedTimestamp metav1.Time) []korifiv1alpha1.BuilderInfoStatusStack {
    if clusterBuilder.Status.Stack.ID == "" {
        return []korifiv1alpha1.BuilderInfoStatusStack{}
    }

    return []korifiv1alpha1.BuilderInfoStatusStack{
        {
            Name:              clusterBuilder.Status.Stack.ID,
            Description:       "",
            CreationTimestamp: clusterBuilder.CreationTimestamp,
            UpdatedTimestamp:  updatedTimestamp,
        },
    }
}

func clusterBuilderToBuildpacks(builder *buildv1alpha2.ClusterBuilder, updatedTimestamp metav1.Time) []korifiv1alpha1.BuilderInfoStatusBuildpack {
    buildpackRecords := make([]korifiv1alpha1.BuilderInfoStatusBuildpack, 0, len(builder.Status.Order))
    for _, orderEntry := range builder.Status.Order {
        buildpackRecords = append(buildpackRecords, korifiv1alpha1.BuilderInfoStatusBuildpack{
            Name:              orderEntry.Group[0].Id,
            Stack:             builder.Status.Stack.ID,
            Version:           orderEntry.Group[0].Version,
            CreationTimestamp: builder.CreationTimestamp,
            UpdatedTimestamp:  updatedTimestamp,
        })
    }
    return buildpackRecords
}

func lastUpdatedTime(metadata metav1.ObjectMeta) metav1.Time {
    latestTime := metadata.CreationTimestamp
    for _, managedField := range metadata.ManagedFields {
        t := managedField.Time
        if t != nil && t.After(latestTime.Time) {
            latestTime = *t
        }
    }
    return latestTime
}