Added exceptions to database

maloja/apis/native_v1.py

@@ -47,6 +47,14 @@ errors = {
 			'desc':"A scrobble requires these parameters."
 		}
 	}),
+	database.exceptions.EntityExists: lambda e: (409,{
+		"status":"failure",
+		"error":{
+			'type':'entity_exists',
+			'value':e.entitydict,
+			'desc':"This entity already exists in the database."
+		}
+	}),
 	Exception: lambda e: (500,{
 		"status":"failure",
 		"error":{

maloja/database/exceptions.py

@@ -0,0 +1,10 @@
+class EntityExists(Exception):
+	def __init__(self,entitydict):
+		self.entitydict = entitydict
+
+
+class TrackExists(EntityExists):
+	pass
+
+class ArtistExists(EntityExists):
+	pass