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Bount the source of subscribers to an informer
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components/ws-manager-mk2/controllers/subscriber_controller.go
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// Copyright (c) 2022 Gitpod GmbH. All rights reserved. | ||
// Licensed under the GNU Affero General Public License (AGPL). | ||
// See License-AGPL.txt in the project root for license information. | ||
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package controllers | ||
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import ( | ||
"context" | ||
"os" | ||
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"k8s.io/apimachinery/pkg/api/errors" | ||
"k8s.io/apimachinery/pkg/runtime" | ||
"k8s.io/client-go/tools/record" | ||
ctrl "sigs.k8s.io/controller-runtime" | ||
"sigs.k8s.io/controller-runtime/pkg/client" | ||
"sigs.k8s.io/controller-runtime/pkg/controller" | ||
"sigs.k8s.io/controller-runtime/pkg/handler" | ||
"sigs.k8s.io/controller-runtime/pkg/log" | ||
"sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
"sigs.k8s.io/controller-runtime/pkg/source" | ||
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config "github.com/gitpod-io/gitpod/ws-manager/api/config" | ||
workspacev1 "github.com/gitpod-io/gitpod/ws-manager/api/crd/v1" | ||
) | ||
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func NewSubscriberReconciler(c client.Client, scheme *runtime.Scheme, recorder record.EventRecorder, cfg *config.Configuration) (*SubscriberReconciler, error) { | ||
reconciler := &SubscriberReconciler{ | ||
Client: c, | ||
Scheme: scheme, | ||
Config: cfg, | ||
Recorder: recorder, | ||
} | ||
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return reconciler, nil | ||
} | ||
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type SubscriberReconciler struct { | ||
client.Client | ||
Scheme *runtime.Scheme | ||
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Config *config.Configuration | ||
Recorder record.EventRecorder | ||
OnReconcile func(ctx context.Context, ws *workspacev1.Workspace) | ||
} | ||
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// Reconcile is part of the main kubernetes reconciliation loop which aims to | ||
// move the current state of the cluster closer to the desired state. | ||
// Modify the Reconcile function to compare the state specified by | ||
// the Workspace object against the actual cluster state, and then | ||
// perform operations to make the cluster state reflect the state specified by | ||
// the user. | ||
// | ||
// For more details, check Reconcile and its Result here: | ||
// - https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/reconcile | ||
func (r *SubscriberReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { | ||
log := log.FromContext(ctx) | ||
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var workspace workspacev1.Workspace | ||
if err := r.Get(ctx, req.NamespacedName, &workspace); err != nil { | ||
if !errors.IsNotFound(err) { | ||
log.Error(err, "unable to fetch workspace") | ||
} | ||
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return ctrl.Result{}, client.IgnoreNotFound(err) | ||
} | ||
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if r.OnReconcile != nil { | ||
// Publish to subscribers in a goroutine, to prevent blocking the main reconcile loop. | ||
ws := workspace.DeepCopy() | ||
go func() { | ||
r.OnReconcile(ctx, ws) | ||
}() | ||
} | ||
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return reconcile.Result{}, nil | ||
} | ||
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// SetupWithManager sets up the controller with the Manager. | ||
func (r *SubscriberReconciler) SetupWithManager(ctx context.Context, mgr ctrl.Manager) error { | ||
c, err := controller.NewUnmanaged("maintenance-controller", mgr, controller.Options{Reconciler: r}) | ||
if err != nil { | ||
return err | ||
} | ||
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go func() { | ||
err = c.Start(ctx) | ||
if err != nil { | ||
log.FromContext(ctx).Error(err, "cannot start maintenance reconciler") | ||
os.Exit(1) | ||
} | ||
}() | ||
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return c.Watch(source.Kind(mgr.GetCache(), &workspacev1.Workspace{}), &handler.EnqueueRequestForObject{}) | ||
} |
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