my-rook-config/pkg/operator/api/api.go

/*
Copyright 2016 The Rook Authors. All rights reserved.

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 api

import (
	"fmt"

	"github.com/rook/rook/pkg/cephmgr/mon"
	"github.com/rook/rook/pkg/model"
	"github.com/rook/rook/pkg/operator/k8sutil"
	"k8s.io/client-go/1.5/kubernetes"
	"k8s.io/client-go/1.5/pkg/api/v1"
	extensions "k8s.io/client-go/1.5/pkg/apis/extensions/v1beta1"
	"k8s.io/client-go/1.5/pkg/util/intstr"
)

const (
	restApp        = "rook-rest"
	deploymentName = "rook-rest-api"
)

type Cluster struct {
	Namespace string
	Version   string
	Replicas  int32
}

func New(namespace, version string) *Cluster {
	return &Cluster{
		Namespace: namespace,
		Version:   version,
		Replicas:  1,
	}
}

func (c *Cluster) Start(clientset *kubernetes.Clientset, cluster *mon.ClusterInfo) error {
	logger.Infof("starting the Rook rest api")

	if cluster == nil || len(cluster.Monitors) == 0 {
		return fmt.Errorf("missing mons to start")
	}

	// start the service
	err := c.startService(clientset, cluster)
	if err != nil {
		return fmt.Errorf("failed to start rest api service. %+v", err)
	}

	// start the deployment
	deployment, err := c.makeDeployment(cluster)
	_, err = clientset.Deployments(c.Namespace).Create(deployment)
	if err != nil {
		if !k8sutil.IsKubernetesResourceAlreadyExistError(err) {
			return fmt.Errorf("failed to create rest api deployment. %+v", err)
		}
		logger.Infof("rest api deployment already exists")
	} else {
		logger.Infof("rest api deployment started")
	}

	return nil
}

func (c *Cluster) makeDeployment(cluster *mon.ClusterInfo) (*extensions.Deployment, error) {
	deployment := &extensions.Deployment{}
	deployment.Name = deploymentName
	deployment.Namespace = c.Namespace

	podSpec := v1.PodTemplateSpec{
		ObjectMeta: v1.ObjectMeta{
			Name:        deploymentName,
			Labels:      getLabels(cluster.Name),
			Annotations: map[string]string{},
		},
		Spec: v1.PodSpec{
			Containers:    []v1.Container{c.restContainer(cluster)},
			RestartPolicy: v1.RestartPolicyAlways,
			Volumes: []v1.Volume{
				{Name: k8sutil.DataDirVolume, VolumeSource: v1.VolumeSource{EmptyDir: &v1.EmptyDirVolumeSource{}}},
			},
		},
	}

	deployment.Spec = extensions.DeploymentSpec{Template: podSpec, Replicas: &c.Replicas}

	return deployment, nil
}

func (c *Cluster) restContainer(cluster *mon.ClusterInfo) v1.Container {

	command := fmt.Sprintf("/usr/bin/rook-operator restapi --data-dir=%s --mon-endpoints=%s --cluster-name=%s --mon-secret=%s --admin-secret=%s --rest-api-port=%d",
		k8sutil.DataDir, mon.FlattenMonEndpoints(cluster.Monitors), cluster.Name, cluster.MonitorSecret, cluster.AdminSecret, model.Port)
	return v1.Container{
		// TODO: fix "sleep 5".
		// Without waiting some time, there is highly probable flakes in network setup.
		Command: []string{"/bin/sh", "-c", fmt.Sprintf("sleep 5; %s", command)},
		Name:    restApp,
		Image:   fmt.Sprintf("quay.io/rook/rook-operator:%v", c.Version),
		VolumeMounts: []v1.VolumeMount{
			{Name: k8sutil.DataDirVolume, MountPath: k8sutil.DataDir},
		},
	}
}

func (c *Cluster) startService(clientset *kubernetes.Clientset, clusterInfo *mon.ClusterInfo) error {
	labels := getLabels(clusterInfo.Name)
	s := &v1.Service{
		ObjectMeta: v1.ObjectMeta{
			Name:   "rook-rest-api",
			Labels: labels,
		},
		Spec: v1.ServiceSpec{
			Ports: []v1.ServicePort{
				{
					Name:       "rook-rest-api",
					Port:       model.Port,
					TargetPort: intstr.FromInt(int(model.Port)),
					Protocol:   v1.ProtocolTCP,
				},
			},
			Selector: labels,
		},
	}

	s, err := clientset.Services(k8sutil.Namespace).Create(s)
	if err != nil {
		if !k8sutil.IsKubernetesResourceAlreadyExistError(err) {
			return fmt.Errorf("failed to create rest api service. %+v", err)
		}
	}

	logger.Infof("REST API service running at %s:%d", s.Spec.ClusterIP, model.Port)
	return nil
}

func getLabels(clusterName string) map[string]string {
	return map[string]string{
		k8sutil.AppAttr:     restApp,
		k8sutil.ClusterAttr: clusterName,
	}
}