Add support for composite keys

Composite keys help us store objects which are unique
for a given set of pre-existing objects.
Eg: Many profiles can exist for a definition and its
key will have a definition name as a part of the composite key.
P2: Use a predefined interface for keys instead of generic interfaceP{}
P3: Add check for empty strings in stringer interface
P5: Add appropriate keys in other packages.

Issue-ID: MULTICLOUD-531
Change-Id: I314b1fbd718489ae8a45f0f38915c08ca32f9f43
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

6 files changed, 188 insertions, 142 deletions

diff --git a/src/k8splugin/internal/db/consul.go b/src/k8splugin/internal/db/consul.go
index a61a4c10..23d2ae88 100644
--- a/src/k8splugin/internal/db/consul.go
+++ b/src/k8splugin/internal/db/consul.go
@@ -54,7 +54,7 @@ func NewConsulStore(store ConsulKVStore) (Store, error) {
 
 // HealthCheck verifies if the database is up and running
 func (c *ConsulStore) HealthCheck() error {
-	_, err := c.Read("test", "test", "test")
+	_, _, err := c.client.Get("test", nil)
 	if err != nil {
 		return pkgerrors.New("[ERROR] Cannot talk to Datastore. Check if it is running/reachable.")
 	}
@@ -67,7 +67,13 @@ func (c *ConsulStore) Unmarshal(inp []byte, out interface{}) error {
 }
 
 // Create is used to create a DB entry
-func (c *ConsulStore) Create(root, key, tag string, data interface{}) error {
+func (c *ConsulStore) Create(root string, key Key, tag string, data interface{}) error {
+
+	//Convert to string as Consul only supports string based keys
+	k := key.String()
+	if k == "" {
+		return pkgerrors.New("Key.String() returned an empty string")
+	}
 
 	value, err := Serialize(data)
 	if err != nil {
@@ -75,7 +81,7 @@ func (c *ConsulStore) Create(root, key, tag string, data interface{}) error {
 	}
 
 	p := &api.KVPair{
-		Key:   key,
+		Key:   k,
 		Value: []byte(value),
 	}
 	_, err = c.client.Put(p, nil)
@@ -83,9 +89,16 @@ func (c *ConsulStore) Create(root, key, tag string, data interface{}) error {
 }
 
 // Read method returns the internalID for a particular externalID
-func (c *ConsulStore) Read(root, key, tag string) ([]byte, error) {
-	key = root + "/" + key + "/" + tag
-	pair, _, err := c.client.Get(key, nil)
+func (c *ConsulStore) Read(root string, key Key, tag string) ([]byte, error) {
+
+	//Convert to string as Consul only supports string based keys
+	k := key.String()
+	if k == "" {
+		return nil, pkgerrors.New("Key.String() returned an empty string")
+	}
+
+	k = root + "/" + k + "/" + tag
+	pair, _, err := c.client.Get(k, nil)
 	if err != nil {
 		return nil, err
 	}
@@ -96,13 +109,19 @@ func (c *ConsulStore) Read(root, key, tag string) ([]byte, error) {
 }
 
 // Delete method removes an internalID from the Database
-func (c *ConsulStore) Delete(root, key, tag string) error {
-	_, err := c.client.Delete(key, nil)
+func (c *ConsulStore) Delete(root string, key Key, tag string) error {
+
+	//Convert to string as Consul only supports string based keys
+	k := key.String()
+	if k == "" {
+		return pkgerrors.New("Key.String() returned an empty string")
+	}
+	_, err := c.client.Delete(k, nil)
 	return err
 }
 
 // ReadAll is used to get all ExternalIDs in a namespace
-func (c *ConsulStore) ReadAll(root, tag string) (map[string][]byte, error) {
+func (c *ConsulStore) ReadAll(root string, tag string) (map[string][]byte, error) {
 	pairs, _, err := c.client.List(root, nil)
 	if err != nil {
 		return nil, err
diff --git a/src/k8splugin/internal/db/consul_test.go b/src/k8splugin/internal/db/consul_test.go
index 754112ad..6d127841 100644
--- a/src/k8splugin/internal/db/consul_test.go
+++ b/src/k8splugin/internal/db/consul_test.go
@@ -102,19 +102,20 @@ func TestConsulCreate(t *testing.T) {
 	testCases := []struct {
 		label         string
 		input         map[string]string
+		key           Key
 		mock          *mockConsulKVStore
 		expectedError string
 	}{
 		{
 			label: "Sucessful register a record to Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test-key",
-				"tag": "data", "value": "test-value"},
-			mock: &mockConsulKVStore{},
+			key:   mockKey{Key: "test-key"},
+			input: map[string]string{"root": "rbinst", "tag": "data", "value": "test-value"},
+			mock:  &mockConsulKVStore{},
 		},
 		{
 			label: "Fail to create a new record in Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test-key",
-				"tag": "data", "value": "test-value"},
+			key:   mockKey{Key: "test-key"},
+			input: map[string]string{"root": "rbinst", "tag": "data", "value": "test-value"},
 			mock: &mockConsulKVStore{
 				Err: pkgerrors.New("DB error"),
 			},
@@ -125,7 +126,7 @@ func TestConsulCreate(t *testing.T) {
 	for _, testCase := range testCases {
 		t.Run(testCase.label, func(t *testing.T) {
 			client, _ := NewConsulStore(testCase.mock)
-			err := client.Create(testCase.input["root"], testCase.input["key"],
+			err := client.Create(testCase.input["root"], testCase.key,
 				testCase.input["tag"], testCase.input["value"])
 			if err != nil {
 				if testCase.expectedError == "" {
@@ -143,14 +144,15 @@ func TestConsulRead(t *testing.T) {
 	testCases := []struct {
 		label          string
 		input          map[string]string
+		key            Key
 		mock           *mockConsulKVStore
 		expectedError  string
 		expectedResult string
 	}{
 		{
 			label: "Sucessful retrieve a record from Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test",
-				"tag": "data"},
+			key:   mockKey{Key: "test"},
+			input: map[string]string{"root": "rbinst", "tag": "data"},
 			mock: &mockConsulKVStore{
 				Items: api.KVPairs{
 					&api.KVPair{
@@ -163,14 +165,14 @@ func TestConsulRead(t *testing.T) {
 		},
 		{
 			label: "Fail retrieve a non-existing record from Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test-key",
-				"tag": "data"},
-			mock: &mockConsulKVStore{},
+			key:   mockKey{Key: "test-key"},
+			input: map[string]string{"root": "rbinst", "tag": "data"},
+			mock:  &mockConsulKVStore{},
 		},
 		{
 			label: "Fail retrieve a record from Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test-key",
-				"tag": "data"},
+			key:   mockKey{Key: "test-key"},
+			input: map[string]string{"root": "rbinst", "tag": "data"},
 			mock: &mockConsulKVStore{
 				Err: pkgerrors.New("DB error"),
 			},
@@ -181,7 +183,7 @@ func TestConsulRead(t *testing.T) {
 	for _, testCase := range testCases {
 		t.Run(testCase.label, func(t *testing.T) {
 			client, _ := NewConsulStore(testCase.mock)
-			result, err := client.Read(testCase.input["root"], testCase.input["key"],
+			result, err := client.Read(testCase.input["root"], testCase.key,
 				testCase.input["tag"])
 			if err != nil {
 				if testCase.expectedError == "" {
@@ -196,7 +198,7 @@ func TestConsulRead(t *testing.T) {
 				}
 				if !reflect.DeepEqual(testCase.expectedResult, string(result)) {
 
-					t.Fatalf("Read method returned: \n%v\n and it was expected: \n%v", result, testCase.expectedResult)
+					t.Fatalf("Read method returned: \n%v\n while expected value was: \n%v", result, testCase.expectedResult)
 				}
 			}
 		})
@@ -207,17 +209,19 @@ func TestConsulDelete(t *testing.T) {
 	testCases := []struct {
 		label         string
 		input         map[string]string
+		key           Key
 		mock          *mockConsulKVStore
 		expectedError string
 	}{
 		{
 			label: "Sucessful delete a record to Consul Database",
-			input: map[string]string{"root": "rbinst", "key": "test-key",
-				"tag": "data"},
-			mock: &mockConsulKVStore{},
+			key:   mockKey{Key: "test-key"},
+			input: map[string]string{"root": "rbinst", "tag": "data"},
+			mock:  &mockConsulKVStore{},
 		},
 		{
 			label: "Fail to delete a record in Consul Database",
+			key:   mockKey{Key: "test-key"},
 			mock: &mockConsulKVStore{
 				Err: pkgerrors.New("DB error"),
 			},
@@ -228,7 +232,7 @@ func TestConsulDelete(t *testing.T) {
 	for _, testCase := range testCases {
 		t.Run(testCase.label, func(t *testing.T) {
 			client, _ := NewConsulStore(testCase.mock)
-			err := client.Delete(testCase.input["root"], testCase.input["key"],
+			err := client.Delete(testCase.input["root"], testCase.key,
 				testCase.input["tag"])
 			if err != nil {
 				if testCase.expectedError == "" {
diff --git a/src/k8splugin/internal/db/mongo.go b/src/k8splugin/internal/db/mongo.go
index d414f543..8c422380 100644
--- a/src/k8splugin/internal/db/mongo.go
+++ b/src/k8splugin/internal/db/mongo.go
@@ -108,10 +108,17 @@ func (m *MongoStore) HealthCheck() error {
 }
 
 // validateParams checks to see if any parameters are empty
-func (m *MongoStore) validateParams(args ...string) bool {
+func (m *MongoStore) validateParams(args ...interface{}) bool {
 	for _, v := range args {
-		if v == "" {
-			return false
+		val, ok := v.(string)
+		if ok {
+			if val == "" {
+				return false
+			}
+		} else {
+			if v == nil {
+				return false
+			}
 		}
 	}
 
@@ -119,7 +126,7 @@ func (m *MongoStore) validateParams(args ...string) bool {
 }
 
 // Create is used to create a DB entry
-func (m *MongoStore) Create(coll, key, tag string, data interface{}) error {
+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")
 	}
@@ -168,7 +175,7 @@ func (m *MongoStore) Unmarshal(inp []byte, out interface{}) error {
 }
 
 // Read method returns the data stored for this key and for this particular tag
-func (m *MongoStore) Read(coll, key, tag string) ([]byte, error) {
+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")
 	}
@@ -223,7 +230,7 @@ func (m *MongoStore) deleteObjectByID(coll string, objID primitive.ObjectID) err
 
 // 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, key, tag string) error {
+func (m *MongoStore) Delete(coll string, key Key, tag string) error {
 	if !m.validateParams(coll, key, tag) {
 		return pkgerrors.New("Mandatory fields are missing")
 	}
@@ -314,10 +321,10 @@ func (m *MongoStore) ReadAll(coll, tag string) (map[string][]byte, error) {
 		d := cursor.Current
 
 		//Read key of each master table
-		key, ok := d.Lookup("key").StringValueOK()
+		key, ok := d.Lookup("key").DocumentOK()
 		if !ok {
-			log.Printf("Unable to read key string from mastertable %s", err.Error())
-			continue
+			//Throw error if key is not found
+			pkgerrors.New("Unable to read key from mastertable")
 		}
 
 		//Get objectID of tag document
@@ -333,7 +340,7 @@ func (m *MongoStore) ReadAll(coll, tag string) (map[string][]byte, error) {
 			log.Printf("Unable to decode tag data %s", err.Error())
 			continue
 		}
-		result[key] = tagData.Lookup(tag).Value
+		result[key.String()] = tagData.Lookup(tag).Value
 	}
 
 	if len(result) == 0 {
diff --git a/src/k8splugin/internal/db/mongo_test.go b/src/k8splugin/internal/db/mongo_test.go
index 973921c3..deb51044 100644
--- a/src/k8splugin/internal/db/mongo_test.go
+++ b/src/k8splugin/internal/db/mongo_test.go
@@ -84,7 +84,7 @@ func TestCreate(t *testing.T) {
 			label: "Successfull creation of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "tagName",
 				"data": "Data In String Format",
 			},
@@ -95,7 +95,7 @@ func TestCreate(t *testing.T) {
 			label: "UnSuccessfull creation of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "tagName",
 				"data": "Data In String Format",
 			},
@@ -108,7 +108,7 @@ func TestCreate(t *testing.T) {
 			label: "Missing input fields",
 			input: map[string]interface{}{
 				"coll": "",
-				"key":  "",
+				"key":  mockKey{Key: ""},
 				"tag":  "",
 				"data": "",
 			},
@@ -129,7 +129,7 @@ func TestCreate(t *testing.T) {
 				return testCase.bson, testCase.mockColl.Err
 			}
 
-			err := m.Create(testCase.input["coll"].(string), testCase.input["key"].(string),
+			err := m.Create(testCase.input["coll"].(string), testCase.input["key"].(Key),
 				testCase.input["tag"].(string), testCase.input["data"])
 			if err != nil {
 				if testCase.expectedError == "" {
@@ -156,59 +156,57 @@ func TestRead(t *testing.T) {
 			label: "Successfull Read of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "metadata",
 			},
 			// Binary form of
 			// {
 			//	"_id" : ObjectId("5c115156777ff85654248ae1"),
-			//  "key" : "b82c4bb1-09ff-6093-4d58-8327b94e1e20",
+			//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
 			//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
 			// }
 			bson: bson.Raw{
-				'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-				'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-				'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-				'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-				'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-				'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-				'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-				'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-				'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-				'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-				'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-				'\xfd', '\x00',
+				'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+				'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+				'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+				'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+				'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+				'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+				'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+				'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+				'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+				'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+				'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 			},
 			mockColl: &mockCollection{},
 			// This is not the document because we are mocking decodeBytes
-			expected: []byte{92, 17, 81, 86, 201, 117, 80, 71, 227, 24, 187, 253},
+			expected: []byte{92, 17, 81, 86, 119, 127, 248, 86, 84, 36, 138, 225},
 		},
 		{
 			label: "UnSuccessfull Read of entry: object not found",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "badtag",
 			},
 			// Binary form of
 			// {
 			//	"_id" : ObjectId("5c115156777ff85654248ae1"),
-			//  "key" : "b82c4bb1-09ff-6093-4d58-8327b94e1e20",
+			//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
 			//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
 			// }
 			bson: bson.Raw{
-				'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-				'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-				'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-				'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-				'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-				'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-				'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-				'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-				'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-				'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-				'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-				'\xfd', '\x00',
+				'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+				'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+				'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+				'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+				'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+				'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+				'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+				'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+				'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+				'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+				'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 			},
 			mockColl:      &mockCollection{},
 			expectedError: "Error finding objectID",
@@ -217,7 +215,7 @@ func TestRead(t *testing.T) {
 			label: "UnSuccessfull Read of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "tagName",
 			},
 			mockColl: &mockCollection{
@@ -229,7 +227,7 @@ func TestRead(t *testing.T) {
 			label: "Missing input fields",
 			input: map[string]interface{}{
 				"coll": "",
-				"key":  "",
+				"key":  mockKey{Key: ""},
 				"tag":  "",
 			},
 			expectedError: "Mandatory fields are missing",
@@ -248,7 +246,7 @@ func TestRead(t *testing.T) {
 			decodeBytes = func(sr *mongo.SingleResult) (bson.Raw, error) {
 				return testCase.bson, testCase.mockColl.Err
 			}
-			got, err := m.Read(testCase.input["coll"].(string), testCase.input["key"].(string),
+			got, err := m.Read(testCase.input["coll"].(string), testCase.input["key"].(Key),
 				testCase.input["tag"].(string))
 			if err != nil {
 				if testCase.expectedError == "" {
@@ -259,7 +257,7 @@ func TestRead(t *testing.T) {
 				}
 			} else {
 				if bytes.Compare(got, testCase.expected) != 0 {
-					t.Fatalf("Read returned unexpected data: %s, expected: %s",
+					t.Fatalf("Read returned unexpected data: %v, expected: %v",
 						string(got), testCase.expected)
 				}
 			}
@@ -279,28 +277,27 @@ func TestDelete(t *testing.T) {
 			label: "Successfull Delete of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "metadata",
 			},
 			// Binary form of
 			// {
 			//	"_id" : ObjectId("5c115156777ff85654248ae1"),
-			//  "key" : "b82c4bb1-09ff-6093-4d58-8327b94e1e20",
+			//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
 			//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
 			// }
 			bson: bson.Raw{
-				'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-				'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-				'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-				'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-				'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-				'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-				'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-				'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-				'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-				'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-				'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-				'\xfd', '\x00',
+				'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+				'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+				'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+				'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+				'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+				'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+				'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+				'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+				'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+				'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+				'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 			},
 			mockColl: &mockCollection{},
 		},
@@ -308,7 +305,7 @@ func TestDelete(t *testing.T) {
 			label: "UnSuccessfull Delete of entry",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "tagName",
 			},
 			mockColl: &mockCollection{
@@ -320,22 +317,27 @@ func TestDelete(t *testing.T) {
 			label: "UnSuccessfull Delete, key not found",
 			input: map[string]interface{}{
 				"coll": "collname",
-				"key":  "keyvalue",
+				"key":  mockKey{Key: "keyvalue"},
 				"tag":  "tagName",
 			},
+			// Binary form of
+			// {
+			//	"_id" : ObjectId("5c115156777ff85654248ae1"),
+			//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
+			//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
+			// }
 			bson: bson.Raw{
-				'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-				'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-				'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-				'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-				'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-				'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-				'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-				'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-				'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-				'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-				'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-				'\xfd', '\x00',
+				'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+				'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+				'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+				'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+				'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+				'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+				'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+				'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+				'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+				'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+				'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 			},
 			mockColl:      &mockCollection{},
 			expectedError: "Error finding objectID",
@@ -344,7 +346,7 @@ func TestDelete(t *testing.T) {
 			label: "Missing input fields",
 			input: map[string]interface{}{
 				"coll": "",
-				"key":  "",
+				"key":  mockKey{Key: ""},
 				"tag":  "",
 			},
 			expectedError: "Mandatory fields are missing",
@@ -363,7 +365,7 @@ func TestDelete(t *testing.T) {
 			decodeBytes = func(sr *mongo.SingleResult) (bson.Raw, error) {
 				return testCase.bson, testCase.mockColl.Err
 			}
-			err := m.Delete(testCase.input["coll"].(string), testCase.input["key"].(string),
+			err := m.Delete(testCase.input["coll"].(string), testCase.input["key"].(Key),
 				testCase.input["tag"].(string))
 			if err != nil {
 				if testCase.expectedError == "" {
@@ -397,29 +399,29 @@ func TestReadAll(t *testing.T) {
 					// Binary form of
 					// {
 					//	"_id" : ObjectId("5c115156777ff85654248ae1"),
-					//  "key" : "b82c4bb1-09ff-6093-4d58-8327b94e1e20",
+					//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
 					//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
 					// }
+
 					Current: bson.Raw{
-						'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-						'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-						'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-						'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-						'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-						'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-						'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-						'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-						'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-						'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-						'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-						'\xfd', '\x00',
+						'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+						'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+						'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+						'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+						'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+						'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+						'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+						'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+						'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+						'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+						'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 					},
 				},
 				mCursorCount: 1,
 			},
 			expected: map[string][]byte{
-				"b82c4bb1-09ff-6093-4d58-8327b94e1e20": []byte{
-					92, 17, 81, 86, 201, 117, 80, 71, 227, 24, 187, 253},
+				`{"name": "testdef","version": "v1"}`: []byte{
+					92, 17, 81, 86, 119, 127, 248, 86, 84, 36, 138, 225},
 			},
 		},
 		{
@@ -444,22 +446,21 @@ func TestReadAll(t *testing.T) {
 					// Binary form of
 					// {
 					//	"_id" : ObjectId("5c115156777ff85654248ae1"),
-					//  "key" : "b82c4bb1-09ff-6093-4d58-8327b94e1e20",
+					//  "key" : bson.D{{"name","testdef"},{"version","v1"}},
 					//  "metadata" : ObjectId("5c115156c9755047e318bbfd")
 					// }
 					Current: bson.Raw{
-						'\x5a', '\x00', '\x00', '\x00', '\x07', '\x5f', '\x69', '\x64',
-						'\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f', '\xf8',
-						'\x56', '\x54', '\x24', '\x8a', '\xe1', '\x02', '\x6b', '\x65',
-						'\x79', '\x00', '\x25', '\x00', '\x00', '\x00', '\x62', '\x38',
-						'\x32', '\x63', '\x34', '\x62', '\x62', '\x31', '\x2d', '\x30',
-						'\x39', '\x66', '\x66', '\x2d', '\x36', '\x30', '\x39', '\x33',
-						'\x2d', '\x34', '\x64', '\x35', '\x38', '\x2d', '\x38', '\x33',
-						'\x32', '\x37', '\x62', '\x39', '\x34', '\x65', '\x31', '\x65',
-						'\x32', '\x30', '\x00', '\x07', '\x6d', '\x65', '\x74', '\x61',
-						'\x64', '\x61', '\x74', '\x61', '\x00', '\x5c', '\x11', '\x51',
-						'\x56', '\xc9', '\x75', '\x50', '\x47', '\xe3', '\x18', '\xbb',
-						'\xfd', '\x00',
+						'\x58', '\x00', '\x00', '\x00', '\x03', '\x6b', '\x65', '\x79',
+						'\x00', '\x27', '\x00', '\x00', '\x00', '\x02', '\x6e', '\x61',
+						'\x6d', '\x65', '\x00', '\x08', '\x00', '\x00', '\x00', '\x74',
+						'\x65', '\x73', '\x74', '\x64', '\x65', '\x66', '\x00', '\x02',
+						'\x76', '\x65', '\x72', '\x73', '\x69', '\x6f', '\x6e', '\x00',
+						'\x03', '\x00', '\x00', '\x00', '\x76', '\x31', '\x00', '\x00',
+						'\x07', '\x6d', '\x65', '\x74', '\x61', '\x64', '\x61', '\x74',
+						'\x61', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77', '\x7f',
+						'\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x07', '\x5f',
+						'\x69', '\x64', '\x00', '\x5c', '\x11', '\x51', '\x56', '\x77',
+						'\x7f', '\xf8', '\x56', '\x54', '\x24', '\x8a', '\xe1', '\x00',
 					},
 				},
 				mCursorCount: 1,
diff --git a/src/k8splugin/internal/db/store.go b/src/k8splugin/internal/db/store.go
index a235597a..148e078e 100644
--- a/src/k8splugin/internal/db/store.go
+++ b/src/k8splugin/internal/db/store.go
@@ -23,6 +23,13 @@ import (
 // DBconn interface used to talk a concrete Database connection
 var DBconn Store
 
+// Key is an interface that will be implemented by anypackage
+// that wants to use the Store interface. This allows various
+// db backends and key types.
+type Key interface {
+	String() string
+}
+
 // Store is an interface for accessing a database
 type Store interface {
 	// Returns nil if db health is good
@@ -33,19 +40,19 @@ type Store interface {
 
 	// Creates a new master table with key and links data with tag and
 	// creates a pointer to the newly added data in the master table
-	Create(table, key, tag string, data interface{}) error
+	Create(table string, key Key, tag string, data interface{}) error
 
 	// Reads data for a particular key with specific tag.
-	Read(table, key, tag string) ([]byte, error)
+	Read(table string, key Key, tag string) ([]byte, error)
 
 	//TODO: Update(context.Context, string, interface{}) error
 
 	// Deletes a specific tag data for key.
 	// TODO: If tag is empty, it will delete all tags under key.
-	Delete(table, key, tag string) error
+	Delete(table string, key Key, tag string) error
 
 	// Reads all master tables and data from the specified tag in table
-	ReadAll(table, tag string) (map[string][]byte, error)
+	ReadAll(table string, tag string) (map[string][]byte, error)
 }
 
 // CreateDBClient creates the DB client
diff --git a/src/k8splugin/internal/db/testing.go b/src/k8splugin/internal/db/testing.go
index a6c940ef..a411790e 100644
--- a/src/k8splugin/internal/db/testing.go
+++ b/src/k8splugin/internal/db/testing.go
@@ -20,6 +20,14 @@ import (
 	pkgerrors "github.com/pkg/errors"
 )
 
+type mockKey struct {
+	Key string
+}
+
+func (m mockKey) String() string {
+	return m.Key
+}
+
 //Creating an embedded interface via anonymous variable
 //This allows us to make mockDB satisfy the DatabaseConnection
 //interface even if we are not implementing all the methods in it
@@ -29,7 +37,7 @@ type MockDB struct {
 	Err   error
 }
 
-func (m *MockDB) Create(table, key, tag string, data interface{}) error {
+func (m *MockDB) Create(table string, key Key, tag string, data interface{}) error {
 	return m.Err
 }
 
@@ -42,13 +50,13 @@ func (m *MockDB) Unmarshal(inp []byte, out interface{}) error {
 	return nil
 }
 
-func (m *MockDB) Read(table, key, tag string) ([]byte, error) {
+func (m *MockDB) Read(table string, key Key, tag string) ([]byte, error) {
 	if m.Err != nil {
 		return nil, m.Err
 	}
 
 	for k, v := range m.Items {
-		if k == key {
+		if k == key.String() {
 			return v[tag], nil
 		}
 	}
@@ -56,11 +64,11 @@ func (m *MockDB) Read(table, key, tag string) ([]byte, error) {
 	return nil, m.Err
 }
 
-func (m *MockDB) Delete(table, key, tag string) error {
+func (m *MockDB) Delete(table string, key Key, tag string) error {
 	return m.Err
 }
 
-func (m *MockDB) ReadAll(table, tag string) (map[string][]byte, error) {
+func (m *MockDB) ReadAll(table string, tag string) (map[string][]byte, error) {
 	if m.Err != nil {
 		return nil, m.Err
 	}