aboutsummaryrefslogtreecommitdiffstats
path: root/src/k8splugin/internal/app/instance.go
blob: d28fe799e389efaa7611c5c8232109f664e2a6e8 (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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/*
 * Copyright 2018 Intel Corporation, Inc
 *
 * 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 (
	"encoding/base64"
	"encoding/json"
	"log"
	"math/rand"

	"github.com/onap/multicloud-k8s/src/k8splugin/internal/db"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/helm"
	"github.com/onap/multicloud-k8s/src/k8splugin/internal/rb"

	pkgerrors "github.com/pkg/errors"
)

// InstanceRequest contains the parameters needed for instantiation
// of profiles
type InstanceRequest struct {
	RBName      string            `json:"rb-name"`
	RBVersion   string            `json:"rb-version"`
	ProfileName string            `json:"profile-name"`
	CloudRegion string            `json:"cloud-region"`
	Labels      map[string]string `json:"labels"`
}

// InstanceResponse contains the response from instantiation
type InstanceResponse struct {
	ID        string                    `json:"id"`
	Request   InstanceRequest           `json:"request"`
	Namespace string                    `json:"namespace"`
	Resources []helm.KubernetesResource `json:"resources"`
}

// InstanceMiniResponse contains the response from instantiation
// It does NOT include the created resources.
// Use the regular GET to get the created resources for a particular instance
type InstanceMiniResponse struct {
	ID        string          `json:"id"`
	Request   InstanceRequest `json:"request"`
	Namespace string          `json:"namespace"`
}

// InstanceManager is an interface exposes the instantiation functionality
type InstanceManager interface {
	Create(i InstanceRequest) (InstanceResponse, error)
	Get(id string) (InstanceResponse, error)
	List() ([]InstanceMiniResponse, error)
	Find(rbName string, ver string, profile string, labelKeys map[string]string) ([]InstanceResponse, error)
	Delete(id string) error
}

// InstanceKey is used as the primary key in the db
type InstanceKey struct {
	ID string `json:"id"`
}

// We will use json marshalling to convert to string to
// preserve the underlying structure.
func (dk InstanceKey) String() string {
	out, err := json.Marshal(dk)
	if err != nil {
		return ""
	}

	return string(out)
}

// InstanceClient implements the InstanceManager interface
// It will also be used to maintain some localized state
type InstanceClient struct {
	storeName string
	tagInst   string
}

// Using 6 bytes of randomness to generate an 8 character string
func generateInstanceID() string {
	b := make([]byte, 6)
	rand.Read(b)
	return base64.URLEncoding.EncodeToString(b)
}

// NewInstanceClient returns an instance of the InstanceClient
// which implements the InstanceManager
func NewInstanceClient() *InstanceClient {
	return &InstanceClient{
		storeName: "rbdef",
		tagInst:   "instance",
	}
}

// Create an entry for the resource bundle profile in the database
func (v *InstanceClient) Create(i InstanceRequest) (InstanceResponse, error) {

	// Name is required
	if i.RBName == "" || i.RBVersion == "" || i.ProfileName == "" || i.CloudRegion == "" {
		return InstanceResponse{},
			pkgerrors.New("RBName, RBversion, ProfileName, CloudRegion are required to create a new instance")
	}

	//Check if profile exists
	profile, err := rb.NewProfileClient().Get(i.RBName, i.RBVersion, i.ProfileName)
	if err != nil {
		return InstanceResponse{}, pkgerrors.New("Unable to find Profile to create instance")
	}

	overrideValues := []string{}

	//Execute the kubernetes create command
	sortedTemplates, err := rb.NewProfileClient().Resolve(i.RBName, i.RBVersion, i.ProfileName, overrideValues)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Error resolving helm charts")
	}

	k8sClient := KubernetesClient{}
	err = k8sClient.init(i.CloudRegion)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Getting CloudRegion Information")
	}

	createdResources, err := k8sClient.createResources(sortedTemplates, profile.Namespace)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Create Kubernetes Resources")
	}

	id := generateInstanceID()

	//Compose the return response
	resp := InstanceResponse{
		ID:        id,
		Request:   i,
		Namespace: profile.Namespace,
		Resources: createdResources,
	}

	key := InstanceKey{
		ID: id,
	}
	err = db.DBconn.Create(v.storeName, key, v.tagInst, resp)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Creating Instance DB Entry")
	}

	return resp, nil
}

// Get returns the instance for corresponding ID
func (v *InstanceClient) Get(id string) (InstanceResponse, error) {
	key := InstanceKey{
		ID: id,
	}
	value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
	if err != nil {
		return InstanceResponse{}, pkgerrors.Wrap(err, "Get Instance")
	}

	//value is a byte array
	if value != nil {
		resp := InstanceResponse{}
		err = db.DBconn.Unmarshal(value, &resp)
		if err != nil {
			return InstanceResponse{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
		}
		return resp, nil
	}

	return InstanceResponse{}, pkgerrors.New("Error getting Instance")
}

// List returns the instance for corresponding ID
// Empty string returns all
func (v *InstanceClient) List() ([]InstanceMiniResponse, error) {

	dbres, err := db.DBconn.ReadAll(v.storeName, v.tagInst)
	if err != nil || len(dbres) == 0 {
		return []InstanceMiniResponse{}, pkgerrors.Wrap(err, "Listing Instances")
	}

	var results []InstanceMiniResponse
	for key, value := range dbres {
		//value is a byte array
		if value != nil {
			resp := InstanceResponse{}
			err = db.DBconn.Unmarshal(value, &resp)
			if err != nil {
				log.Printf("[Instance] Error: %s Unmarshaling Instance: %s", err.Error(), key)
			}

			miniresp := InstanceMiniResponse{
				ID:        resp.ID,
				Request:   resp.Request,
				Namespace: resp.Namespace,
			}
			results = append(results, miniresp)
		}
	}

	return results, nil
}

// Find returns the instances that match the given criteria
// If version is empty, it will return all instances for a given rbName
// If profile is empty, it will return all instances for a given rbName+version
// If labelKeys are provided, the results are filtered based on that.
// It is an AND operation for labelkeys.
func (v *InstanceClient) Find(rbName string, version string, profile string, labelKeys map[string]string) ([]InstanceResponse, error) {
	if rbName == "" && len(labelKeys) == 0 {
		return []InstanceResponse{}, pkgerrors.New("rbName or labelkeys is required and cannot be empty")
	}

	values, err := db.DBconn.ReadAll(v.storeName, v.tagInst)
	if err != nil || len(values) == 0 {
		return []InstanceResponse{}, pkgerrors.Wrap(err, "Find Instance")
	}

	response := []InstanceResponse{}
	//values is a map[string][]byte
InstanceResponseLoop:
	for _, value := range values {
		resp := InstanceResponse{}
		db.DBconn.Unmarshal(value, &resp)
		if err != nil {
			return []InstanceResponse{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
		}

		// Filter by labels provided
		if len(labelKeys) != 0 {
			for lkey, lvalue := range labelKeys {
				//Check if label key exists and get its value
				if val, ok := resp.Request.Labels[lkey]; ok {
					if lvalue != val {
						continue InstanceResponseLoop
					}
				} else {
					continue InstanceResponseLoop
				}
			}
		}

		if rbName != "" {
			if resp.Request.RBName == rbName {

				//Check if a version is provided and if it matches
				if version != "" {
					if resp.Request.RBVersion == version {
						//Check if a profilename matches or if it is not provided
						if profile == "" || resp.Request.ProfileName == profile {
							response = append(response, resp)
						}
					}
				} else {
					//Append all versions as version is not provided
					response = append(response, resp)
				}
			}
		} else {
			response = append(response, resp)
		}
	}

	//filter the list by labelKeys now
	for _, value := range response {
		for _, label := range labelKeys {
			if _, ok := value.Request.Labels[label]; ok {
			}
		}
	}

	return response, nil
}

// Delete the Instance from database
func (v *InstanceClient) Delete(id string) error {
	inst, err := v.Get(id)
	if err != nil {
		return pkgerrors.Wrap(err, "Error getting Instance")
	}

	k8sClient := KubernetesClient{}
	err = k8sClient.init(inst.Request.CloudRegion)
	if err != nil {
		return pkgerrors.Wrap(err, "Getting CloudRegion Information")
	}

	err = k8sClient.deleteResources(inst.Resources, inst.Namespace)
	if err != nil {
		return pkgerrors.Wrap(err, "Deleting Instance Resources")
	}

	key := InstanceKey{
		ID: id,
	}
	err = db.DBconn.Delete(v.storeName, key, v.tagInst)
	if err != nil {
		return pkgerrors.Wrap(err, "Delete Instance")
	}

	return nil
}