crossplane/pkg/controller/azure/database/claim.go

/*
Copyright 2018 The Crossplane Authors.

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 database

import (
	"context"
	"fmt"
	"strings"

	"github.com/pkg/errors"
	corev1 "k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/source"

	"github.com/crossplaneio/crossplane/pkg/apis/azure/database/v1alpha1"
	corev1alpha1 "github.com/crossplaneio/crossplane/pkg/apis/core/v1alpha1"
	databasev1alpha1 "github.com/crossplaneio/crossplane/pkg/apis/database/v1alpha1"
	"github.com/crossplaneio/crossplane/pkg/resource"
)

// AddPostgreSQLClaim adds a controller that reconciles PostgreSQLInstance resource claims by
// managing PostgresqlServer resources to the supplied Manager.
func AddPostgreSQLClaim(mgr manager.Manager) error {
	r := resource.NewClaimReconciler(mgr,
		resource.ClaimKind(databasev1alpha1.PostgreSQLInstanceGroupVersionKind),
		resource.ManagedKind(v1alpha1.PostgresqlServerGroupVersionKind),
		resource.WithManagedConfigurators(
			resource.ManagedConfiguratorFn(ConfigurePostgresqlServer),
			resource.NewObjectMetaConfigurator(mgr.GetScheme()),
		))

	name := strings.ToLower(fmt.Sprintf("%s.%s", databasev1alpha1.PostgreSQLInstanceKind, controllerName))
	c, err := controller.New(name, mgr, controller.Options{Reconciler: r})
	if err != nil {
		return errors.Wrapf(err, "cannot create %s controller", name)
	}

	if err := c.Watch(&source.Kind{Type: &v1alpha1.PostgresqlServer{}}, &resource.EnqueueRequestForClaim{}); err != nil {
		return errors.Wrapf(err, "cannot watch for %s", v1alpha1.PostgresqlServerGroupVersionKind)
	}

	p := v1alpha1.PostgresqlServerKindAPIVersion
	return errors.Wrapf(c.Watch(
		&source.Kind{Type: &databasev1alpha1.PostgreSQLInstance{}},
		&handler.EnqueueRequestForObject{},
		resource.NewPredicates(resource.ObjectHasProvisioner(mgr.GetClient(), p)),
	), "cannot watch for %s", databasev1alpha1.PostgreSQLInstanceGroupVersionKind)
}

// ConfigurePostgresqlServer configures the supplied resource (presumed to be a
// PostgresqlServer) using the supplied resource claim (presumed to be a
// PostgreSQLInstance) and resource class.
func ConfigurePostgresqlServer(_ context.Context, cm resource.Claim, cs *corev1alpha1.ResourceClass, mg resource.Managed) error {
	pg, cmok := cm.(*databasev1alpha1.PostgreSQLInstance)
	if !cmok {
		return errors.Errorf("expected resource claim %s to be %s", cm.GetName(), databasev1alpha1.PostgreSQLInstanceGroupVersionKind)
	}

	s, mgok := mg.(*v1alpha1.PostgresqlServer)
	if !mgok {
		return errors.Errorf("expected managed resource %s to be %s", mg.GetName(), v1alpha1.PostgresqlServerGroupVersionKind)
	}

	spec := v1alpha1.NewSQLServerSpec(cs.Parameters)
	v, err := resource.ResolveClassClaimValues(spec.Version, pg.Spec.EngineVersion)
	if err != nil {
		return err
	}
	spec.Version = v

	spec.WriteConnectionSecretToReference = corev1.LocalObjectReference{Name: string(cm.GetUID())}
	spec.ProviderReference = cs.ProviderReference
	spec.ReclaimPolicy = cs.ReclaimPolicy

	s.Spec = *spec

	return nil
}

// AddMySQLClaim adds a controller that reconciles MySQLInstance resource claims
// by managing MysqlServer resources to the supplied Manager.
func AddMySQLClaim(mgr manager.Manager) error {
	r := resource.NewClaimReconciler(mgr,
		resource.ClaimKind(databasev1alpha1.MySQLInstanceGroupVersionKind),
		resource.ManagedKind(v1alpha1.MysqlServerGroupVersionKind),
		resource.WithManagedConfigurators(
			resource.ManagedConfiguratorFn(ConfigureMysqlServer),
			resource.NewObjectMetaConfigurator(mgr.GetScheme()),
		))

	name := strings.ToLower(fmt.Sprintf("%s.%s", databasev1alpha1.MySQLInstanceKind, controllerName))
	c, err := controller.New(name, mgr, controller.Options{Reconciler: r})
	if err != nil {
		return errors.Wrapf(err, "cannot create %s controller", name)
	}

	if err := c.Watch(
		&source.Kind{Type: &v1alpha1.PostgresqlServer{}},
		&resource.EnqueueRequestForClaim{},
	); err != nil {
		return errors.Wrapf(err, "cannot watch for %s", v1alpha1.MysqlServerGroupVersionKind)
	}

	p := v1alpha1.MysqlServerKindAPIVersion
	return errors.Wrapf(c.Watch(
		&source.Kind{Type: &databasev1alpha1.MySQLInstance{}},
		&handler.EnqueueRequestForObject{},
		resource.NewPredicates(resource.ObjectHasProvisioner(mgr.GetClient(), p)),
	), "cannot watch for %s", databasev1alpha1.MySQLInstanceGroupVersionKind)
}

// ConfigureMysqlServer configures the supplied resource (presumed to be
// a MysqlServer) using the supplied resource claim (presumed to be a
// MySQLInstance) and resource class.
func ConfigureMysqlServer(_ context.Context, cm resource.Claim, cs *corev1alpha1.ResourceClass, mg resource.Managed) error {
	my, cmok := cm.(*databasev1alpha1.MySQLInstance)
	if !cmok {
		return errors.Errorf("expected resource claim %s to be %s", cm.GetName(), databasev1alpha1.MySQLInstanceGroupVersionKind)
	}

	s, mgok := mg.(*v1alpha1.MysqlServer)
	if !mgok {
		return errors.Errorf("expected managed resource %s to be %s", mg.GetName(), v1alpha1.MysqlServerGroupVersionKind)
	}

	spec := v1alpha1.NewSQLServerSpec(cs.Parameters)
	v, err := resource.ResolveClassClaimValues(spec.Version, my.Spec.EngineVersion)
	if err != nil {
		return err
	}
	spec.Version = v

	spec.WriteConnectionSecretToReference = corev1.LocalObjectReference{Name: string(cm.GetUID())}
	spec.ProviderReference = cs.ProviderReference
	spec.ReclaimPolicy = cs.ReclaimPolicy

	s.Spec = *spec

	return nil
}