Reworks widgets data structure and response

scripts/lua/rest/v1/get/datasource/datasource.lua

@@ -25,6 +25,8 @@ datasource.BASE_REST_PREFIX = "/lua/rest/v1/get/datasource/"
 
 -- @brief Base class constructor
 function datasource:init()
+   self._dataset_params     = {}  -- Holds per-dataset params
+   self._datamodel_instance = nil -- Instance of the datamodel holding data for each dataset
 end
 
 -- ##############################################
@@ -60,6 +62,51 @@ end
 
 -- ##############################################
 
+-- @brief Parses params
+-- @param params_table A table with submitted params
+-- @return An integer dataset id upon success, nil otherwise
+function datasource:add_dataset(params_table)
+   if not params_table then
+      return nil
+   end
+
+   local cur_params = {}
+   for _, param in pairs(self.meta.params or {}) do
+      local parsed_param = params_table[param]
+
+      -- Assumes all params mandatory and not empty
+      -- May override this behavior in subclasses
+      if isEmptyString(parsed_param) then
+	 return nil
+      end
+
+      cur_params[param] = parsed_param
+   end
+
+   -- Ok, parsing has been successful
+   self._dataset_params[#self._dataset_params + 1] = cur_params
+
+   -- The id is basically the position in the array of dataset_params
+   return #self._dataset_params
+end
+
+-- ##############################################
+
+-- @brief Fetches data of every added dataset
+function datasource:fetch_data()
+   -- Instantiate the datamodel
+   self._datamodel_instance = self.meta.datamodel.new(
+      self.meta.i18n_title
+   )
+
+   -- Fetch datasets data
+   for dataset_id, dataset_params in ipairs(self._dataset_params) do
+      self:_fetch(dataset_id, dataset_params)
+   end
+end
+
+-- ##############################################
+
 -- @brief Parses params submitted along with the REST endpoint request. If parsing fails, a REST error is sent.
 -- @param params_table A table with submitted params, either _POST or _GET
 -- @return True if parameters parsing is successful, false otherwise
@@ -148,6 +195,16 @@ end
 
 -- ##############################################
 
+-- @brief Transform data according to the specified transformation
+-- @param data The data to be transformed
+-- @param transformation The transformation to be applied
+-- @return transformed data
+function datasource:transform_data(transformation)
+   return self._datamodel_instance:datasets_get_data(transformation)
+end
+
+-- ##############################################
+
 return datasource
 
 -- ##############################################