daemon/bindings: check if cache is open

diff --git a/daemon/bindings.c b/daemon/bindings.c
index e18ad10a9e224850c306bed9b255f829e432654b..bc76147ac3ea4dbae18ac8a5116a1ea5632e5f47 100644 (file)
--- a/daemon/bindings.c
+++ b/daemon/bindings.c
@@ -463,7 +463,12 @@ static int cache_open(lua_State *L)
 static int cache_close(lua_State *L)
 {
        struct engine *engine = engine_luaget(L);
-       kr_cache_close(&engine->resolver.cache);
+       struct kr_cache *cache = &engine->resolver.cache;
+       if (!kr_cache_is_open(cache)) {
+               return 0;
+       }
+
+       kr_cache_close(cache);
        lua_getglobal(L, "cache");
        lua_pushstring(L, "current_size");
        lua_pushnumber(L, 0);
@@ -527,6 +532,12 @@ static int cache_remove_prefix(struct kr_cache *cache, const char *args)
 /** Prune expired/invalid records. */
 static int cache_prune(lua_State *L)
 {
+       struct engine *engine = engine_luaget(L);
+       struct kr_cache *cache = &engine->resolver.cache;
+       if (!kr_cache_is_open(cache)) {
+               return 0;
+       }
+
        /* Check parameters */
        int prune_max = UINT16_MAX;
        int n = lua_gettop(L);
@@ -534,9 +545,6 @@ static int cache_prune(lua_State *L)
                prune_max = lua_tointeger(L, 1);
        }
 
-       struct engine *engine = engine_luaget(L);
-       struct kr_cache *cache = &engine->resolver.cache;
-
        /* Check if API supports pruning. */
        int ret = kr_error(ENOSYS);
        if (cache->api->prune) {
@@ -554,6 +562,12 @@ static int cache_prune(lua_State *L)
 /** Clear all records. */
 static int cache_clear(lua_State *L)
 {
+       struct engine *engine = engine_luaget(L);
+       struct kr_cache *cache = &engine->resolver.cache;
+       if (!kr_cache_is_open(cache)) {
+               return 0;
+       }
+
        /* Check parameters */
        const char *args = NULL;
        int n = lua_gettop(L);
@@ -562,8 +576,6 @@ static int cache_clear(lua_State *L)
        }
 
        /* Clear a sub-tree in cache. */
-       struct engine *engine = engine_luaget(L);
-       struct kr_cache *cache = &engine->resolver.cache;
        if (args && strlen(args) > 0) {
                int ret = cache_remove_prefix(cache, args);
                if (ret < 0) {
@@ -631,6 +643,12 @@ static void cache_dump_key(lua_State *L, knot_db_val_t *key)
 /** Query cached records. */
 static int cache_get(lua_State *L)
 {
+       struct engine *engine = engine_luaget(L);
+       struct kr_cache *cache = &engine->resolver.cache;
+       if (!kr_cache_is_open(cache)) {
+               return 0;
+       }
+
        /* Check parameters */
        int n = lua_gettop(L);
        if (n < 1 || !lua_isstring(L, 1)) {
@@ -639,8 +657,6 @@ static int cache_get(lua_State *L)
        }
 
        /* Clear a sub-tree in cache. */
-       struct engine *engine = engine_luaget(L);
-       struct kr_cache *cache = &engine->resolver.cache;
        const char *args = lua_tostring(L, 1);
        /* Retrieve set of keys */
        static knot_db_val_t result_set[100];