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Query refactoring
This commit is contained in:
Yann
parent
10b24a43ff
commit
61dd475e8c
3 changed files with 263 additions and 294 deletions
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@ -1,3 +1,6 @@
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Local configuration :
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First of all copy the settings.ini to settings_local.ini and replace values by correct path
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Doxygen documentation generation :
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doxygen
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@ -273,10 +273,107 @@ class LeObject(object):
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# at the end of the dyncode parse
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# @warning This method is deleted once the dynamic code loaded
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# @param field_list list : list of EmField instance
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# @param cls
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@classmethod
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def _set__fields(cls, field_list):
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cls._fields = field_list
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## @brief Check that datas are valid for this type
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# @param datas dict : key == field name value are field values
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# @param complete bool : if True expect that datas provide values for all non internal fields
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# @param allow_internal bool : if True don't raise an error if a field is internal
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# @param cls
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# @return Checked datas
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# @throw LeApiDataCheckError if errors reported during check
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@classmethod
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def check_datas_value(cls, datas, complete = False, allow_internal = True):
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err_l = dict() #Error storing
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correct = set() #valid fields name
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mandatory = set() #mandatory fields name
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for fname, datahandler in cls._fields.items():
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if allow_internal or not datahandler.is_internal():
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correct.add(fname)
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if complete and not hasattr(datahandler, 'default'):
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mandatory.add(fname)
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provided = set(datas.keys())
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# searching for unknow fields
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for u_f in provided - correct:
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#Here we can check if the field is invalid or rejected because
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# it is internel
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err_l[u_f] = AttributeError("Unknown or unauthorized field '%s'" % u_f)
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# searching for missing mandatory fieldsa
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for missing in mandatory - provided:
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err_l[miss_field] = AttributeError("The data for field '%s' is missing" % missing)
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#Checks datas
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checked_datas = dict()
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for name, value in [ (name, value) for name, value in datas.items() if name in correct ]:
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dh = cls._fields[name]
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res = dh.check_data_value(value)
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checked_datas[name], err = res
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if err:
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err_l[name] = err
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if len(err_l) > 0:
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raise LeApiDataCheckError("Error while checking datas", err_l)
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return checked_datas
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##@brief Check and prepare datas
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#
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# @warning when complete = False we are not able to make construct_datas() and _check_data_consistency()
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#
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# @param datas dict : {fieldname : fieldvalue, ...}
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# @param complete bool : If True you MUST give all the datas
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# @param allow_internal : Wether or not interal fields are expected in datas
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# @param cls
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# @return Datas ready for use
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# @todo: complete is very unsafe, find a way to get rid of it
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@classmethod
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def prepare_datas(cls, datas, complete=False, allow_internal=True):
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if not complete:
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warnings.warn("\nActual implementation can make datas construction and consitency unsafe when datas are not complete\n")
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ret_datas = cls.check_datas_value(datas, complete, allow_internal)
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if isinstance(ret_datas, Exception):
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raise ret_datas
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if complete:
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ret_datas = cls._construct_datas(ret_datas)
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cls._check_datas_consistency(ret_datas)
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return ret_datas
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## @brief Construct datas values
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#
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# @param cls
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# @param datas dict : Datas that have been returned by LeCrud.check_datas_value() methods
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# @return A new dict of datas
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# @todo IMPLEMENTATION
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@classmethod
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def _construct_datas(cls, datas):
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"""
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constructor = DatasConstructor(cls, datas, cls.fieldtypes())
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ret = {
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fname:constructor[fname]
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for fname, ftype in cls.fieldtypes().items()
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if not ftype.is_internal() or ftype.internal != 'autosql'
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}
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return ret
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"""
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pass
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## @brief Check datas consistency
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#
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# @warning assert that datas is complete
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# @param cls
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# @param datas dict : Datas that have been returned by LeCrud._construct_datas() method
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# @throw LeApiDataCheckError if fails
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@classmethod
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def _check_datas_consistency(cls, datas):
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err_l = []
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err_l = dict()
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for fname, dh in cls._fields.items():
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ret = dh.check_data_consistency(cls, fname, datas)
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if isinstance(ret, Exception):
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err_l[fname] = ret
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if len(err_l) > 0:
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raise LeApiDataCheckError("Datas consistency checks fails", err_l)
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@ -2,322 +2,191 @@
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import re
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from .leobject import LeObject, LeApiErrors, LeApiDataCheckError
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from lodel.plugin.hooks import LodelHook
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class LeQueryError(Exception):
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pass
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class LeQuery(object):
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##@brief Hookname preffix
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_hook_prefix = None
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##@brief arguments for the LeObject.check_data_value()
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_data_check_args = { 'complete': False, 'allow_internal': False }
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##@brief The datasource object used for this query
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datasource = None
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##@brief The available operators used in query definitions
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query_operators = ['=', '<=', '>=', '!=', '<', '>', ' in ', ' not in ', ' like ', ' not like ']
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##@brief Constructor
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# @param target_class EmClass : class of the object to query about
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##@brief Abstract constructor
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# @param target_class LeObject : class of object the query is about
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def __init__(self, target_class):
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if hook_prefix is None:
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raise NotImplementedError("Asbtract class")
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if not issubclass(target_class, LeObject):
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raise TypeError("target class has to be a child class of LeObject")
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self.target_class = target_class
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##@brief Class representing an Insert query
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class LeInsertQuery(LeQuery):
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##@brief Constructor
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# @param target_class EmClass: class corresponding to the inserted object
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# @param datas dict : datas to insert
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def __init__(self, target_class, datas):
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super().__init__(target_class)
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self.datas = datas
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##@brief executes the insert query
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# @return bool
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# @TODO reactivate the LodelHooks call when this class is implemented
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def execute(self):
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datas = self.datas # LodelHooks.call_hook('leapi_insert_pre', self.target_class, self.datas)
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ret = self.__insert(**datas)
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# ret = LodelHook.call_hook('leapi_insert_post', self.target_class, ret)
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self.__target_class = target_class
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##@brief Execute a query and return the result
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# @param **datas
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# @return the query result
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# @see LeQuery.__query()
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#
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# @note maybe the datasource in not an argument but should be determined
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#elsewhere
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def execute(self, datasource, **datas):
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if len(datas) > 0:
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self.__target_class.check_datas_value(datas, **self._data_check_args)
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self.__target_class.prepare_datas() #not yet implemented
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if self._hook_prefix is None:
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raise NotImplementedError("Abstract method")
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LodelHook.call_hook( self._hook_prefix+'_pre',
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self.__target_class,
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datas)
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ret = self.__query(datasource, **datas)
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ret = LodelHook.call_hook( self._hook_prefix+'_post',
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self.__target_class,
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ret)
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return ret
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##@brief Childs classes implements this method to execute the query
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# @param **datas
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# @return query result
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def __query(self, **datas):
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raise NotImplementedError("Asbtract method")
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##@brief calls the datasource to perform the insert command
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# @param datas dict : formatted datas corresponding to the insert
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# @return str : the uid of the inserted object
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def __insert(self, **datas):
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insert_datas = self.target_class.prepare_datas(datas, complete=True, allow_internal=True)
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res = self.datasource.insert(self.target_class, **insert_datas)
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return res
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##@brief Class representing an Abstract Filtered Query
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class LeFilteredQuery(LeQuery):
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##@brief The available operators used in query definitions
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query_operators = [
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'=',
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'<=',
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'>=',
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'!=',
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'<',
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'>',
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' in ',
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' not in ',
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' like ',
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' not like ']
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##@brief Abtract constructor for queries with filter
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# @param target_class LeObject : class of object the query is about
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# @param query_filters list : list of string of query filters (or tuple
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#(FIELD, OPERATOR, VALUE) )
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def __init__(self, target_class, query_filter):
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super().__init__(target_class)
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##@brief The query filter
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self.__query_filter = None
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self.set_qeury_filter(query_filter)
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##@brief Set the query filter for a query
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def set_query_filter(self, query_filter):
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#
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# Query filter check & prepare should be done here
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#
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self.__query_filter = query_filter
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##@brief A query for insert a new object
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class LeInsertQuery(LeQuery):
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_hook_prefix = 'leapi_insert_'
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_data_check_args = { 'complete': True, 'allow_internal': False }
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##@brief Constructor
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# @param target_class EmClass : Object of the query
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def __init__(self, target_class):
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super().__init__(target_class)
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## @brief Implements an insert query operations
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# @param **datas : datas to be inserted
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def __query(self, datasource, **datas):
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pass
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##@brief Validates the query filters
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# @param query_filters list
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# @return bool
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# @raise LeQueryError if one of the filter is not valid
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@classmethod
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def validate_query_filters(cls, query_filters):
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for query_filter in query_filters:
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if query_filter[1] not in cls.query_operators:
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raise LeQueryError("The operator %s is not valid." % query_filter[1])
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return True
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##@brief Checks if a field is relational
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# @param field str : Name of the field
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# @return bool
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@classmethod
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def is_relational_field(cls, field):
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return field.startswith('superior.') or field.startswith('subordinate.')
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##@brief Class representing a Get Query
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class LeGetQuery(LeFilteredQuery):
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##@brief Constructor
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# @param target_class EmClass : main class
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# @param query_filters
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# @param field_list list
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# @param order list : list of tuples corresponding to the fields used to sort the results
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# @param group list : list of tuples corresponding to the fields used to group the results
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# @param limit int : Maximum number of results to get
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# @param offset int
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# @param instanciate bool : if True, objects will be returned instead of dictionaries
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def __init__(self, target_class, query_filters, field_list=None, order=None, group=None, limit=None, offset=0, instanciate=True):
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super().__init__(target_class)
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self.query_filters = query_filters
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self.default_field_list = []
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self.field_list = field_list if field_list is not None else self.target_class.fieldnames()
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self.order = order
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self.group = group
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self.limit = limit
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self.offset = offset
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self.instanciate = instanciate
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##@brief executes the query
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# @return list
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# @TODO activate LodelHook calls
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def execute(self):
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datas = self.datas # LodelHook.call_hook('leapi_get_pre', self.target_object, self.datas)
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ret = self.__get(**datas)
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# ret = LodelHook.call_hook('leapi_get_post', self.target_object, ret)
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return ret
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def __get(self, **datas):
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field_list = self.__prepare_field_list(self.field_list)
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query_filters, relational_filters = self.__prepare_filters()
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# Preparing the "order" parameters
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if self.order:
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order = self.__prepare_order()
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if isinstance(order, Exception):
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raise order # can be buffered and raised later, but __prepare_filters raise when fails
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# Preparing the "group" parameters
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if self.group:
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group = self.__prepare_order()
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if isinstance(group, Exception):
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raise group # can be buffered and raised later
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# checks the limit and offset values
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if self.limit is not None and self.limit <= 0:
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raise ValueError('Invalid limit given')
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if self.offset is not None and self.offset < 0:
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raise ValueError('Invalid offset given : %d' % self.offset)
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results = self._datasource.select() # TODO add the correct arguments for the datasource's method call
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return results
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##@brief prepares the field list
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# @return list
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# @raise LeApiDataCheckError
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def __prepare_field_list(self):
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errors = dict()
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ret_field_list = list()
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for field in self.field_list:
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if self.is_relational(field):
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ret = self.__prepare_relational_field(field)
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else:
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ret = self.__check_field(field)
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if isinstance(ret, Exception):
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errors[field] = ret
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else:
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ret_field_list.append(ret)
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if len(errors) > 0:
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raise LeApiDataCheckError(errors)
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return ret_field_list
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##@brief prepares a relational field
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def __prepare_relational_field(self, field):
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# TODO Implement the method
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return field
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##@brief splits the filter string into a tuple (FIELD, OPERATOR, VALUE)
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# @param filter str
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# @return tuple
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# @raise ValueError
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def __split_filter(self, filter):
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if self.query_re is None:
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self.__compile_query_re()
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matches = self.query_re.match(filter)
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if not matches:
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raise ValueError("The query_filter '%s' seems to be invalid" % filter)
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result = (matches.group('field'), re.sub(r'\s', ' ', matches.group('operator')), matches.group('value').strip())
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for r in result:
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if len(r) == 0:
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raise ValueError("The query_filter '%s' seems to be invalid" % filter)
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return result
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def __compile_query_re(self):
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op_re_piece = '(?P<operator>(%s)' % self._query_operators[0].replace(' ', '\s')
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for operator in self._query_operators[1:]:
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op_re_piece += '|(%s)' % operator.replace(' ', '\s')
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op_re_piece += ')'
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self.query_re = re.compile('^\s*(?P<field>(((superior)|(subordinate))\.)?[a-z_][a-z0-9\-_]*)\s*'+op_re_piece+'\s*(?P<value>[^<>=!].*)\s*$', flags=re.IGNORECASE)
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##@brief checks if a field is in the target class of the query
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# @param field str
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# @return str
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# @raise ValueError
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def __check_field(self, field):
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if field not in self.target_class.fieldnames():
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return ValueError("No such field '%s' in %s" % (field, self.target_class))
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return field
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##@brief Prepares the filters (relational and others)
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# @return tuple
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def __prepare_filters(self):
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filters = list()
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errors = dict()
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res_filters = list()
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rel_filters = list()
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# Splitting in tuple if necessary
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for filter in self.query_filters:
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if len(filter) == 3 and not isinstance(filter, str):
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filters.append(tuple(filter))
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else:
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filters.append(self.__split_filter(filter))
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for field, operator, value in filters:
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# TODO check the relation filters
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ret = self.__check_field(field)
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if isinstance(ret, Exception):
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errors[field] = ret
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else:
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res_filters.append((ret, operator, value))
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if len(errors) > 0:
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raise LeApiDataCheckError("Error while preparing filters : ", errors)
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return (res_filters, rel_filters)
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datas = dict()
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if LeFilteredQuery.validate_query_filters(self.query_filters):
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datas['query_filters'] = self.query_filters
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datas['target_class'] = self.target_class
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return datas
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##@brief prepares the "order" parameters
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# @return list
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def __prepare_order(self):
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errors = dict()
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result = []
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for order_field in self.order:
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if not isinstance(order_field, tuple):
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order_field = (order_field, 'ASC')
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if len(order_field) != 2 or order_field[1].upper() not in ['ASC', 'DESC']:
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errors[order_field] = ValueError("Expected a string or a tuple with (FIELDNAME, ['ASC'|'DESC']) but got : %s" % order_field)
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else:
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ret = self.target_class.check_field(order_field[0])
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if isinstance(ret, Exception):
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errors[order_field] = ret
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order_field = (order_field[0], order_field[1].upper())
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result.append(order_field)
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if len(errors) > 0:
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raise LeApiErrors("Errors when preparing ordering fields", errors)
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return result
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##@brief A query to update datas for a given object
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class LeUpdateQuery(LeFilteredQuery):
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_hook_prefix = 'leapi_update_'
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_data_check_args = { 'complete': True, 'allow_internal': False }
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def __init__(self, target_class, target_uid, query_filters):
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super().__init__(target_class)
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self.query_filters = query_filters
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self.target_uid = target_uid
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def execute(self):
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# LodelHook.call_hook('leapi_update_pre', self.target_object, None)
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ret = self.__update()
|
||||
# ret = LodelHook.call_hook('leapi_update_post', self.target_object, ret)
|
||||
return ret
|
||||
|
||||
##@brief calls the datasource's update method and the corresponding hooks
|
||||
# @return bool
|
||||
# @TODO change the behavior in case of error in the update process
|
||||
def __update(self):
|
||||
updated_datas = self.__prepare()
|
||||
ret = self.datasource.update(self.target_uid, **updated_datas) # TODO add the correct arguments for the datasource's method
|
||||
if ret == 1:
|
||||
return True
|
||||
else:
|
||||
return False
|
||||
|
||||
##@brief prepares the query_filters to be used as argument for the datasource's update method
|
||||
def __prepare(self):
|
||||
datas = dict()
|
||||
if LeFilteredQuery.validate_query_filters(self.query_filters):
|
||||
datas['query_filters'] = self.query_filters
|
||||
|
||||
datas['target_uid'] = self.target_uid
|
||||
datas['target_class'] = self._target_class
|
||||
return datas
|
||||
|
||||
def __init__(self, target_class, query_filter):
|
||||
super().__init__(target_class, query_filter)
|
||||
|
||||
##@brief Implements an update query
|
||||
# @param **datas : datas to update
|
||||
def __query(self, datasource, **datas):
|
||||
pass
|
||||
|
||||
##@brief A query to delete an object
|
||||
class LeDeleteQuery(LeFilteredQuery):
|
||||
|
||||
_hook_prefix = 'leapi_delete_'
|
||||
|
||||
def __init__(self, target_class, target_uid, query_filters):
|
||||
super().__init__(self._target_class)
|
||||
self.target_uid = target_uid
|
||||
self.query_filters = query_filters
|
||||
def __init__(self, target_class, query_filter):
|
||||
super().__init__(target_class, query_filter)
|
||||
|
||||
def execute(self):
|
||||
# LodelHook.call_hook('leapi_delete_pre', self.target_uid, None)
|
||||
ret = self.__delete()
|
||||
# ret = LodelHook.call('leapi_delete_post', self.target_object, ret)
|
||||
return ret
|
||||
## @brief Execute the delete query
|
||||
def execute(self, datasource):
|
||||
super().execute()
|
||||
|
||||
##@brief Implements delete query operations
|
||||
def __query(self, datasource):
|
||||
pass
|
||||
|
||||
##@brief calls the datasource's delete method
|
||||
# @return bool
|
||||
# @TODO change the behavior in case of error in the update process
|
||||
def __delete(self):
|
||||
delete_datas = self.__prepare()
|
||||
ret = self._datasource.delete(**delete_datas)
|
||||
return ret
|
||||
class LeGetQuery(LeFilteredQuery):
|
||||
|
||||
_hook_prefix = 'leapi_get_'
|
||||
|
||||
def __prepare(self):
|
||||
datas = dict()
|
||||
if LeFilteredQuery.validate_query_filters(self.query_filters):
|
||||
datas['query_filters'] = self.query_filters
|
||||
##@brief Instanciate a new get query
|
||||
# @param target_class LeObject : class of object the query is about
|
||||
# @param query_filters list : list of string of query filters (or tuple
|
||||
#(FIELD, OPERATOR, VALUE) )
|
||||
# @param field_list list|None : list of string representing fields see @ref leobject_filters
|
||||
# @param order list : A list of field names or tuple (FIELDNAME, [ASC | DESC])
|
||||
# @param group list : A list of field names or tuple (FIELDNAME, [ASC | DESC])
|
||||
# @param limit int : The maximum number of returned results
|
||||
# @param offset int : offset
|
||||
def __init__(self, target_class, query_filter, **kwargs):
|
||||
super().__init__(target_class, query_filter)
|
||||
|
||||
##@brief The fields to get
|
||||
self.__field_list = None
|
||||
##@brief An equivalent to the SQL ORDER BY
|
||||
self.__order = None
|
||||
##@brief An equivalent to the SQL GROUP BY
|
||||
self.__group = None
|
||||
##@brief An equivalent to the SQL LIMIT x
|
||||
self.__limit = None
|
||||
##@brief An equivalent to the SQL LIMIT x, OFFSET
|
||||
self.__offset = 0
|
||||
|
||||
# Checking kwargs and assigning default values if there is some
|
||||
for argname in kwargs:
|
||||
if argname not in ('order', 'group', 'limit', 'offset'):
|
||||
raise TypeError("Unexpected argument '%s'" % argname)
|
||||
|
||||
datas['target_uid'] = self.target_uid
|
||||
datas['target_class'] = self._target_class
|
||||
if 'field_list' not in kwargs:
|
||||
#field_list = target_class.get_field_list
|
||||
pass
|
||||
else:
|
||||
#target_class.check_fields(kwargs['field_list'])
|
||||
field_list = kwargs['field_list']
|
||||
if 'order' in kwargs:
|
||||
#check kwargs['order']
|
||||
self.__order = kwargs['order']
|
||||
if 'group' in kwargs:
|
||||
#check kwargs['group']
|
||||
self.__group = kwargs['group']
|
||||
if 'limit' in kwargs:
|
||||
try:
|
||||
self.__limit = int(kwargs[limit])
|
||||
if self.__limit <= 0:
|
||||
raise ValueError()
|
||||
except ValueError:
|
||||
raise ValueError("limit argument expected to be an interger > 0")
|
||||
if 'offset' in kwargs:
|
||||
try:
|
||||
self.__offset = int(kwargs['offset'])
|
||||
if self.__offset < 0:
|
||||
raise ValueError()
|
||||
except ValueError:
|
||||
raise ValueError("offset argument expected to be an integer >= 0")
|
||||
|
||||
##@brief Execute the get query
|
||||
def execute(self, datasource):
|
||||
super().execute(datasource)
|
||||
|
||||
return datas
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue