Check that redis do not return empty table

Co-authored-by: danilapog <[email protected]>
Co-committed-by: danilapog <[email protected]>

templates/ingresses/documentserver.yaml

@@ -170,6 +170,25 @@ metadata:
           end
         end
 
+        local function get_redis_data(ver)
+          local data
+          local checker
+          repeat
+            if ver then
+              data = red:scan(0, "count", 10000, "match", string.format('*-%s', ver))
+            else
+              data = red:scan(0, "count", 10000)
+            end
+            local nested_table = data[2]
+            checker = (tostring(cjson.encode(nested_table)))
+            if checker == "{}" then
+               print("WARN: Redis return empty table for some reason...")
+               ngx.sleep(1)
+            end
+          until checker ~= "{}"
+          return data
+        end
+
         -- return random endpoint from redis by requested version
         local function get_random_endpoint(ver, api_key)
            red:select({{ .Values.documentserver.dsVersionHashRedisDBNum }})
@@ -178,11 +197,7 @@ metadata:
            local endpoint_exist = false
            if api_key or api_js_exist() then
              repeat
-               if ver then
-                 data = red:scan(0, "count", 10000, "match", string.format('*-%s', ver))
-               else
-                 data = red:scan(0, "count", 10000)
-               end
+               data = get_redis_data(ver)
                local static_endpoints = data[2]
                local new_endpoint = tostring((static_endpoints[math.random(1, #static_endpoints)]))
                random_endpoint = new_endpoint:gsub("%-.+$", "")
@@ -193,11 +208,7 @@ metadata:
                end
              until endpoint_exist
            else
-             if ver then
-               data = red:scan(0, "count", 10000, "match", string.format('*-%s', ver))
-             else
-               data = red:scan(0, "count", 10000)
-             end
+             data = get_redis_data(ver)
              local static_endpoints = data[2]
              local new_endpoint = tostring((static_endpoints[math.random(1, #static_endpoints)]))
              random_endpoint = new_endpoint:gsub("%-.+$", "")