improve and simplify repository caching

cache/cache.go

@@ -1,5 +1,7 @@
 package cache
 
+//go:generate mockery -name Cache -output mock -case=underscore
+
 import (
 	"time"
 
@@ -23,7 +25,7 @@ func Set(c context.Context, key string, value interface{}) error {
 // Default creates an in-memory cache with the default
 // 30 minute expiration period.
 func Default() Cache {
-	return cache.NewMemoryWithTTL(time.Minute * 30)
+	return NewTTL(time.Minute * 30)
 }
 
 // NewTTL returns an in-memory cache with the specified
@@ -31,9 +33,3 @@ func Default() Cache {
 func NewTTL(t time.Duration) Cache {
 	return cache.NewMemoryWithTTL(t)
 }
-
-// NewTTL returns an in-memory cache with the specified
-// ttl expiration period.
-func NewLRU(size int) Cache {
-	return cache.NewLRU(size)
-}