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>

1 files changed, 11 insertions, 4 deletions

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