summaryrefslogtreecommitdiffstats
path: root/src/k8splugin/internal/db/mongo.go
blob: a9e9d98a0a62702518a5df3a72bc1c6489c09452 (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
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
/*
 * 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 db

import (
	"golang.org/x/net/context"
	"log"
	"os"

	pkgerrors "github.com/pkg/errors"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

// MongoCollection defines the a subset of MongoDB operations
// Note: This interface is defined mainly for mock testing
type MongoCollection interface {
	InsertOne(ctx context.Context, document interface{},
		opts ...*options.InsertOneOptions) (*mongo.InsertOneResult, error)
	FindOne(ctx context.Context, filter interface{},
		opts ...*options.FindOneOptions) *mongo.SingleResult
	FindOneAndUpdate(ctx context.Context, filter interface{},
		update interface{}, opts ...*options.FindOneAndUpdateOptions) *mongo.SingleResult
	DeleteOne(ctx context.Context, filter interface{},
		opts ...*options.DeleteOptions) (*mongo.DeleteResult, error)
	Find(ctx context.Context, filter interface{},
		opts ...*options.FindOptions) (*mongo.Cursor, error)
}

// MongoStore is an implementation of the db.Store interface
type MongoStore struct {
	db *mongo.Database
}

// This exists only for allowing us to mock the collection object
// for testing purposes
var getCollection = func(coll string, m *MongoStore) MongoCollection {
	return m.db.Collection(coll)
}

// This exists only for allowing us to mock the DecodeBytes function
// Mainly because we cannot construct a SingleResult struct from our
// tests. All fields in that struct are private.
var decodeBytes = func(sr *mongo.SingleResult) (bson.Raw, error) {
	return sr.DecodeBytes()
}

// These exists only for allowing us to mock the cursor.Next function
// Mainly because we cannot construct a mongo.Cursor struct from our
// tests. All fields in that struct are private and there is no public
// constructor method.
var cursorNext = func(ctx context.Context, cursor *mongo.Cursor) bool {
	return cursor.Next(ctx)
}
var cursorClose = func(ctx context.Context, cursor *mongo.Cursor) error {
	return cursor.Close(ctx)
}

// NewMongoStore initializes a Mongo Database with the name provided
// If a database with that name exists, it will be returned
func NewMongoStore(name string, store *mongo.Database) (Store, error) {
	if store == nil {
		ip := "mongodb://" + os.Getenv("DATABASE_IP") + ":27017"
		clientOptions := options.Client()
		clientOptions.ApplyURI(ip)
		mongoClient, err := mongo.NewClient(clientOptions)
		if err != nil {
			return nil, err
		}

		err = mongoClient.Connect(context.Background())
		if err != nil {
			return nil, err
		}
		store = mongoClient.Database(name)
	}

	return &MongoStore{
		db: store,
	}, nil
}

// HealthCheck verifies if the database is up and running
func (m *MongoStore) HealthCheck() error {

	_, err := decodeBytes(m.db.RunCommand(context.Background(), bson.D{{"serverStatus", 1}}))
	if err != nil {
		return pkgerrors.Wrap(err, "Error getting server status")
	}

	return nil
}

// validateParams checks to see if any parameters are empty
func (m *MongoStore) validateParams(args ...interface{}) bool {
	for _, v := range args {
		val, ok := v.(string)
		if ok {
			if val == "" {
				return false
			}
		} else {
			if v == nil {
				return false
			}
		}
	}

	return true
}

// Create is used to create a DB entry
func (m *MongoStore) Create(coll string, key Key, tag string, data interface{}) error {
	if data == nil || !m.validateParams(coll, key, tag) {
		return pkgerrors.New("No Data to store")
	}

	c := getCollection(coll, m)
	ctx := context.Background()

	//Insert the data and then add the objectID to the masterTable
	res, err := c.InsertOne(ctx, bson.D{
		{tag, data},
	})
	if err != nil {
		return pkgerrors.Errorf("Error inserting into database: %s", err.Error())
	}

	//Add objectID of created data to masterKey document
	//Create masterkey document if it does not exist
	filter := bson.D{{"key", key}}

	_, err = decodeBytes(
		c.FindOneAndUpdate(
			ctx,
			filter,
			bson.D{
				{"$set", bson.D{
					{tag, res.InsertedID},
				}},
			},
			options.FindOneAndUpdate().SetUpsert(true).SetReturnDocument(options.After)))

	if err != nil {
		return pkgerrors.Errorf("Error updating master table: %s", err.Error())
	}

	return nil
}

// Update is used to update a DB entry
func (m *MongoStore) Update(coll string, key Key, tag string, data interface{}) error {
	if data == nil || !m.validateParams(coll, key, tag) {
		return pkgerrors.New("No Data to update")
	}

	c := getCollection(coll, m)
	ctx := context.Background()

	//Get the masterkey document based on given key
	filter := bson.D{{"key", key}}
	keydata, err := decodeBytes(c.FindOne(context.Background(), filter))
	if err != nil {
		return pkgerrors.Errorf("Error finding master table: %s", err.Error())
	}

	//Read the tag objectID from document
	tagoid, ok := keydata.Lookup(tag).ObjectIDOK()
	if !ok {
		return pkgerrors.Errorf("Error finding objectID for tag %s", tag)
	}

	//Update the document with new data
	filter = bson.D{{"_id", tagoid}}

	_, err = decodeBytes(
		c.FindOneAndUpdate(
			ctx,
			filter,
			bson.D{
				{"$set", bson.D{
					{tag, data},
				}},
			},
			options.FindOneAndUpdate().SetReturnDocument(options.After)))

	if err != nil {
		return pkgerrors.Errorf("Error updating record: %s", err.Error())
	}

	return nil
}

// Unmarshal implements an unmarshaler for bson data that
// is produced from the mongo database
func (m *MongoStore) Unmarshal(inp []byte, out interface{}) error {
	err := bson.Unmarshal(inp, out)
	if err != nil {
		return pkgerrors.Wrap(err, "Unmarshaling bson")
	}
	return nil
}

// Read method returns the data stored for this key and for this particular tag
func (m *MongoStore) Read(coll string, key Key, tag string) ([]byte, error) {
	if !m.validateParams(coll, key, tag) {
		return nil, pkgerrors.New("Mandatory fields are missing")
	}

	c := getCollection(coll, m)
	ctx := context.Background()

	//Get the masterkey document based on given key
	filter := bson.D{{"key", key}}
	keydata, err := decodeBytes(c.FindOne(context.Background(), filter))
	if err != nil {
		return nil, pkgerrors.Errorf("Error finding master table: %s", err.Error())
	}

	//Read the tag objectID from document
	tagoid, ok := keydata.Lookup(tag).ObjectIDOK()
	if !ok {
		return nil, pkgerrors.Errorf("Error finding objectID for tag %s", tag)
	}

	//Use tag objectID to read the data from store
	filter = bson.D{{"_id", tagoid}}
	tagdata, err := decodeBytes(c.FindOne(ctx, filter))
	if err != nil {
		return nil, pkgerrors.Errorf("Error reading found object: %s", err.Error())
	}

	//Return the data as a byte array
	//Convert string data to byte array using the built-in functions
	switch tagdata.Lookup(tag).Type {
	case bson.TypeString:
		return []byte(tagdata.Lookup(tag).StringValue()), nil
	default:
		return tagdata.Lookup(tag).Value, nil
	}
}

// Helper function that deletes an object by its ID
func (m *MongoStore) deleteObjectByID(coll string, objID primitive.ObjectID) error {

	c := getCollection(coll, m)
	ctx := context.Background()

	_, err := c.DeleteOne(ctx, bson.D{{"_id", objID}})
	if err != nil {
		return pkgerrors.Errorf("Error Deleting from database: %s", err.Error())
	}

	log.Printf("Deleted Obj with ID %s", objID.String())
	return nil
}

// Delete method removes a document from the Database that matches key
// TODO: delete all referenced docs if tag is empty string
func (m *MongoStore) Delete(coll string, key Key, tag string) error {
	if !m.validateParams(coll, key, tag) {
		return pkgerrors.New("Mandatory fields are missing")
	}

	c := getCollection(coll, m)
	ctx := context.Background()

	//Get the masterkey document based on given key
	filter := bson.D{{"key", key}}
	//Remove the tag ID entry from masterkey table
	update := bson.D{
		{
			"$unset", bson.D{
				{tag, ""},
			},
		},
	}
	keydata, err := decodeBytes(c.FindOneAndUpdate(ctx, filter, update,
		options.FindOneAndUpdate().SetReturnDocument(options.Before)))
	if err != nil {
		//No document was found. Return nil.
		if err == mongo.ErrNoDocuments {
			return nil
		}
		//Return any other error that was found.
		return pkgerrors.Errorf("Error decoding master table after update: %s",
			err.Error())
	}

	//Read the tag objectID from document
	elems, err := keydata.Elements()
	if err != nil {
		return pkgerrors.Errorf("Error reading elements from database: %s", err.Error())
	}

	tagoid, ok := keydata.Lookup(tag).ObjectIDOK()
	if !ok {
		return pkgerrors.Errorf("Error finding objectID for tag %s", tag)
	}

	//Use tag objectID to read the data from store
	err = m.deleteObjectByID(coll, tagoid)
	if err != nil {
		return pkgerrors.Errorf("Error deleting from database: %s", err.Error())
	}

	//Delete master table if no more tags left
	//_id, key and tag should be elements in before doc
	//if master table needs to be removed too
	if len(elems) == 3 {
		keyid, ok := keydata.Lookup("_id").ObjectIDOK()
		if !ok {
			return pkgerrors.Errorf("Error finding objectID for key %s", key)
		}
		err = m.deleteObjectByID(coll, keyid)
		if err != nil {
			return pkgerrors.Errorf("Error deleting master table from database: %s", err.Error())
		}
	}

	return nil
}

// ReadAll is used to get all documents in db of a particular tag
func (m *MongoStore) ReadAll(coll, tag string) (map[string][]byte, error) {
	if !m.validateParams(coll, tag) {
		return nil, pkgerrors.New("Missing collection or tag name")
	}

	c := getCollection(coll, m)
	ctx := context.Background()

	//Get all master tables in this collection
	filter := bson.D{
		{"key", bson.D{
			{"$exists", true},
		}},
	}
	cursor, err := c.Find(ctx, filter)
	if err != nil {
		return nil, pkgerrors.Errorf("Error reading from database: %s", err.Error())
	}
	defer cursorClose(ctx, cursor)

	//Iterate over all the master tables
	result := make(map[string][]byte)
	for cursorNext(ctx, cursor) {
		d := cursor.Current

		//Read key of each master table
		key, ok := d.Lookup("key").DocumentOK()
		if !ok {
			//Throw error if key is not found
			pkgerrors.New("Unable to read key from mastertable")
		}

		//Get objectID of tag document
		tid, ok := d.Lookup(tag).ObjectIDOK()
		if !ok {
			log.Printf("Did not find tag: %s", tag)
			continue
		}

		//Find tag document and unmarshal it into []byte
		tagData, err := decodeBytes(c.FindOne(ctx, bson.D{{"_id", tid}}))
		if err != nil {
			log.Printf("Unable to decode tag data %s", err.Error())
			continue
		}
		result[key.String()] = tagData.Lookup(tag).Value
	}

	if len(result) == 0 {
		return result, pkgerrors.Errorf("Did not find any objects with tag: %s", tag)
	}

	return result, nil
}