summaryrefslogtreecommitdiffstats
path: root/src/k8splugin/internal/app/client.go
blob: 914a8eec9e72dad404dd2222cc198f8decac56e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/*
Copyright 2018 Intel Corporation.
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 app

import (
	"log"
	"os"
	"time"

	"github.com/onap/multicloud-k8s/src/k8splugin/internal/connection"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/helm"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/plugin"

	pkgerrors "github.com/pkg/errors"
	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/discovery"
	"k8s.io/client-go/dynamic"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/restmapper"
	"k8s.io/client-go/tools/clientcmd"
)

// KubernetesClient encapsulates the different clients' interfaces
// we need when interacting with a Kubernetes cluster
type KubernetesClient struct {
	clientSet      kubernetes.Interface
	dynamicClient  dynamic.Interface
	discoverClient discovery.CachedDiscoveryInterface
	restMapper     meta.RESTMapper
	instanceID     string
}

// getKubeConfig uses the connectivity client to get the kubeconfig based on the name
// of the cloudregion. This is written out to a file.
func (k *KubernetesClient) getKubeConfig(cloudregion string) (string, error) {

	conn := connection.NewConnectionClient()
	kubeConfigPath, err := conn.Download(cloudregion)
	if err != nil {
		return "", pkgerrors.Wrap(err, "Downloading kubeconfig")
	}

	return kubeConfigPath, nil
}

// init loads the Kubernetes configuation values stored into the local configuration file
func (k *KubernetesClient) init(cloudregion string, iid string) error {
	if cloudregion == "" {
		return pkgerrors.New("Cloudregion is empty")
	}

	if iid == "" {
		return pkgerrors.New("Instance ID is empty")
	}

	k.instanceID = iid

	configPath, err := k.getKubeConfig(cloudregion)
	if err != nil {
		return pkgerrors.Wrap(err, "Get kubeconfig file")
	}

	//Remove kubeconfigfile after the clients are created
	defer os.Remove(configPath)

	config, err := clientcmd.BuildConfigFromFlags("", configPath)
	if err != nil {
		return pkgerrors.Wrap(err, "setConfig: Build config from flags raised an error")
	}

	k.clientSet, err = kubernetes.NewForConfig(config)
	if err != nil {
		return err
	}

	k.dynamicClient, err = dynamic.NewForConfig(config)
	if err != nil {
		return pkgerrors.Wrap(err, "Creating dynamic client")
	}

	k.discoverClient, err = discovery.NewCachedDiscoveryClientForConfig(config, os.TempDir(), "", 10*time.Minute)
	if err != nil {
		return pkgerrors.Wrap(err, "Creating discovery client")
	}

	k.restMapper = restmapper.NewDeferredDiscoveryRESTMapper(k.discoverClient)

	return nil
}

func (k *KubernetesClient) ensureNamespace(namespace string) error {

	pluginImpl, err := plugin.GetPluginByKind("Namespace")
	if err != nil {
		return pkgerrors.Wrap(err, "Loading Namespace Plugin")
	}

	ns, err := pluginImpl.Get(helm.KubernetesResource{
		Name: namespace,
		GVK: schema.GroupVersionKind{
			Group:   "",
			Version: "v1",
			Kind:    "Namespace",
		},
	}, namespace, k)

	if ns == "" {
		log.Println("Creating " + namespace + " namespace")

		_, err = pluginImpl.Create("", namespace, k)
		if err != nil {
			return pkgerrors.Wrap(err, "Error creating "+namespace+" namespace")
		}
	}
	return nil
}

func (k *KubernetesClient) createKind(resTempl helm.KubernetesResourceTemplate,
	namespace string) (helm.KubernetesResource, error) {

	if _, err := os.Stat(resTempl.FilePath); os.IsNotExist(err) {
		return helm.KubernetesResource{}, pkgerrors.New("File " + resTempl.FilePath + "does not exists")
	}

	log.Println("Processing file: " + resTempl.FilePath)

	pluginImpl, err := plugin.GetPluginByKind(resTempl.GVK.Kind)
	if err != nil {
		return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error loading plugin")
	}

	createdResourceName, err := pluginImpl.Create(resTempl.FilePath, namespace, k)
	if err != nil {
		log.Printf("Error: %s while creating: %s", err.Error(), resTempl.GVK.Kind)
		return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error in plugin "+resTempl.GVK.Kind+" plugin")
	}

	log.Print(createdResourceName + " created")
	return helm.KubernetesResource{
		GVK:  resTempl.GVK,
		Name: createdResourceName,
	}, nil
}

func (k *KubernetesClient) createResources(sortedTemplates []helm.KubernetesResourceTemplate,
	namespace string) ([]helm.KubernetesResource, error) {

	err := k.ensureNamespace(namespace)
	if err != nil {
		return nil, pkgerrors.Wrap(err, "Creating Namespace")
	}

	var createdResources []helm.KubernetesResource
	for _, resTempl := range sortedTemplates {
		resCreated, err := k.createKind(resTempl, namespace)
		if err != nil {
			return nil, pkgerrors.Wrapf(err, "Error creating kind: %+v", resTempl.GVK)
		}
		createdResources = append(createdResources, resCreated)
	}

	return createdResources, nil
}

func (k *KubernetesClient) deleteKind(resource helm.KubernetesResource, namespace string) error {
	log.Println("Deleting Kind: " + resource.GVK.Kind)

	pluginImpl, err := plugin.GetPluginByKind(resource.GVK.Kind)
	if err != nil {
		return pkgerrors.Wrap(err, "Error loading plugin")
	}

	log.Println("Deleting resource: " + resource.Name)
	err = pluginImpl.Delete(resource, namespace, k)
	if err != nil {
		return pkgerrors.Wrap(err, "Error deleting "+resource.Name)
	}

	return nil
}

func (k *KubernetesClient) deleteResources(resources []helm.KubernetesResource, namespace string) error {
	//TODO: Investigate if deletion should be in a particular order
	for _, res := range resources {
		err := k.deleteKind(res, namespace)
		if err != nil {
			return pkgerrors.Wrap(err, "Deleting resources")
		}
	}

	return nil
}

//GetMapper returns the RESTMapper that was created for this client
func (k *KubernetesClient) GetMapper() meta.RESTMapper {
	return k.restMapper
}

//GetDynamicClient returns the dynamic client that is needed for
//unstructured REST calls to the apiserver
func (k *KubernetesClient) GetDynamicClient() dynamic.Interface {
	return k.dynamicClient
}

// GetStandardClient returns the standard client that can be used to handle
// standard kubernetes kinds
func (k *KubernetesClient) GetStandardClient() kubernetes.Interface {
	return k.clientSet
}

//GetInstanceID returns the instanceID that is injected into all the
//resources created by the plugin
func (k *KubernetesClient) GetInstanceID() string {
	return k.instanceID
}