Simplify random_key wrapper

Author: secwall

src/lua/ffi_api.lua

@@ -271,7 +271,9 @@ function VKM.db_size(ctx)
     return tonumber(C.ValkeyModule_DbSize(ctx))
 end
 
-function VKM.random_key(ctx)
+function VKM.random_key()
+    local ctx = VKM.ctx()
+    if ctx == nil then return VKM.ERR end
     local rms = C.ValkeyModule_RandomKey(ctx)
     if rms == nil then
         return nil

tests/scripting-ffi.tcl

@@ -40,17 +40,15 @@ start_server {tags {"scripting-ffi"} overrides {luajit.enable-ffi-api yes}} {
         r set "key1" "value1"
         r set "key2" "value2"
         r eval "
-            local ctx = VKM.ctx()
-            local key = VKM.random_key(ctx)
+            local key = VKM.random_key()
             return type(key)
         " 0
     } {string}
     r del "key1" "key2"
 
     test {FFI - random_key returns nil for empty DB} {
         r eval "
-            local ctx = VKM.ctx()
-            local key = VKM.random_key(ctx)
+            local key = VKM.random_key()
             if key == nil then
                 return 'nil'
             else
@@ -62,8 +60,7 @@ start_server {tags {"scripting-ffi"} overrides {luajit.enable-ffi-api yes}} {
     test {FFI - random_key returns valid key from DB} {
         r set "testkey" "testvalue"
         r eval "
-            local ctx = VKM.ctx()
-            local key = VKM.random_key(ctx)
+            local key = VKM.random_key()
             return key
         " 0
     } {testkey}