graph2: Added importLog query and associated models and repository functions.

internal/counter/counter.go

@@ -30,6 +30,24 @@ func Next(category, name string) (int, error) {
 	return doc.Value, nil
 }
 
+// NextMany gets the next value of a counter, or an error if it hasn't, and increments by a specified value.
+// Any value `returned` to `returned+(increment-1)` should then be safe to use.
+func NextMany(category, name string, increment int) (int, error) {
+	id := category + "." + name
+	doc := counter{}
+
+	_, err := collection.Find(bson.M{"_id": id}).Apply(mgo.Change{
+		Update:    bson.M{"$inc": bson.M{"value": 1}},
+		Upsert:    true,
+		ReturnNew: true,
+	}, &doc)
+	if err != nil {
+		return -1, err
+	}
+
+	return doc.Value, nil
+}
+
 func init() {
 	store.HandleInit(func(db *mgo.Database) {
 		collection = db.C("core.counters")