export cache package, add client interceptor customization

core/stores/cache/util.go

@@ -0,0 +1,22 @@
+package cache
+
+import "strings"
+
+const keySeparator = ","
+
+func TotalWeights(c []NodeConf) int {
+	var weights int
+
+	for _, node := range c {
+		if node.Weight < 0 {
+			node.Weight = 0
+		}
+		weights += node.Weight
+	}
+
+	return weights
+}
+
+func formatKeys(keys []string) string {
+	return strings.Join(keys, keySeparator)
+}