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""" |
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main class to support Extract script |
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""" |
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# useful methods to measure time performance by small pieces of code |
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from codetiming import Timer |
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# package to facilitate operating system operations |
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import os |
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# package to add support for multi-language (i18n) |
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import gettext |
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# package to facilitate working with directories and files |
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from pathlib import Path |
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# custom classes specific to this project |
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from common.BasicNeeds import BasicNeeds |
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from common.CommandLineArgumentsManagement import CommandLineArgumentsManagement |
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from common.DataManipulator import DataManipulator |
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from common.FileOperations import FileOperations |
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from common.LoggingNeeds import LoggingNeeds |
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from db_extractor.BasicNeedsForExtractor import BasicNeedsForExtractor |
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from db_extractor.DatabaseTalker import DatabaseTalker |
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from db_extractor.ParameterHandling import ParameterHandling |
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class ExtractNeeds: |
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class_bn = None |
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class_bnfe = None |
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class_clam = None |
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class_dbt = None |
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class_dm = None |
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class_fo = None |
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class_ln = None |
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class_ph = None |
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config = None |
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file_extract_sequence = None |
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locale = None |
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parameters = None |
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script = None |
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source_systems = None |
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timer = None |
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user_credentials = None |
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def __init__(self, destination_script, default_language='en_US'): |
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self.script = destination_script |
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current_file_basename = os.path.basename(__file__).replace('.py', '') |
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lang_folder = os.path.join(os.path.dirname(__file__), current_file_basename + '_Locale') |
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self.locale = gettext.translation(current_file_basename, lang_folder, |
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languages=[default_language]) |
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# instantiate Basic Needs class |
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self.class_bn = BasicNeeds(default_language) |
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# instantiate Extractor Specific Needs class |
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self.class_bnfe = BasicNeedsForExtractor(default_language) |
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# instantiate File Operations class |
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self.class_fo = FileOperations(default_language) |
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# instantiate File Operations class |
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self.class_dbt = DatabaseTalker(default_language) |
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# instantiate Data Manipulator class, useful to manipulate data frames |
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self.class_dm = DataManipulator(default_language) |
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# instantiate Command Line Arguments class |
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self.class_clam = CommandLineArgumentsManagement(default_language) |
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# instantiate Logger class |
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self.class_ln = LoggingNeeds() |
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# instantiate Parameter Handling class |
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self.class_ph = ParameterHandling(default_language) |
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def close_connection(self, local_logger): |
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self.timer.start() |
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local_logger.info(self.locale.gettext('Closing DB connection')) |
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self.class_dbt.conn.close() |
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local_logger.info(self.locale.gettext('Closing DB completed')) |
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self.timer.stop() |
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def close_cursor(self, local_logger, in_cursor): |
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self.timer.start() |
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local_logger.info(self.locale.gettext('Free DB result-set started')) |
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in_cursor.close() |
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local_logger.info(self.locale.gettext('Free DB result-set completed')) |
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self.timer.stop() |
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def evaluate_if_extraction_is_required(self, crt_session): |
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extraction_required = False |
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if type(crt_session['output-file']) == dict: |
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extraction_required = \ |
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self.evaluate_if_extraction_is_required_for_single_file(crt_session, |
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crt_session['output-file']) |
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elif type(crt_session['output-file']) == list: |
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evaluated_extraction = {} |
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for crt_file in crt_session['output-file']: |
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crt_eval = self.evaluate_if_extraction_is_required_for_single_file(crt_session, |
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crt_file) |
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evaluated_extraction.update({str(crt_file['name']): crt_eval}) |
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extraction_required = self.class_bn.fn_evaluate_dict_values(evaluated_extraction) |
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self.class_ln.logger.debug(evaluated_extraction) |
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overall_verdict = self.locale.gettext('not required') |
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if extraction_required: |
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overall_verdict = self.locale.gettext('required') |
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self.class_ln.logger.debug(self.locale.gettext( \ |
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'Overall new verdict after considering multiple files is: {overall_verdict}') \ |
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.replace('{overall_verdict}', overall_verdict)) |
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return extraction_required |
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def evaluate_if_extraction_is_required_for_single_file(self, crt_session, crt_file): |
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crt_file['name'] = self.class_ph.eval_expression(self.class_ln.logger, |
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crt_file['name'], |
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crt_session['start-isoweekday']) |
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e_dict = { |
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'extract-behaviour': crt_session['extract-behaviour'], |
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'output-csv-file' : crt_file['name'], |
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} |
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extraction_required = \ |
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self.class_bnfe.fn_is_extraction_necessary(self.class_ln.logger, e_dict) |
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if crt_session['extract-behaviour'] == 'overwrite-if-output-file-exists' \ |
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and 'extract-overwrite-condition' in crt_session \ |
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and Path(crt_file['name']).is_file(): |
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fv = self.class_bnfe.fn_is_extraction_neccesary_additional(self.class_ln.logger, |
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self.class_ph, |
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self.class_fo, |
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crt_session, crt_file) |
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extraction_required = False |
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new_verdict = self.locale.gettext('not required') |
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if fv == self.class_fo.lcl.gettext('older'): |
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extraction_required = True |
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new_verdict = self.locale.gettext('required') |
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self.class_ln.logger.debug(self.locale.gettext( \ |
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'Additional evaluation took place and new verdict is: {new_verdict}') \ |
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.replace('{new_verdict}', new_verdict)) |
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return extraction_required |
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def extract_query_to_result_set(self, local_logger, in_cursor, in_dictionary): |
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this_session = in_dictionary['session'] |
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this_query = in_dictionary['query'] |
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# get query parameters into a tuple |
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tuple_parameters = self.class_ph.handle_query_parameters(local_logger, this_session, |
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this_session['start-isoweekday']) |
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# measure expected number of parameters |
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expected_number_of_parameters = str(this_query).count('%s') |
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# simulate final query to log (useful for debugging purposes) |
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simulated_query = self.class_ph.simulate_final_query(local_logger, self.timer, this_query, |
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expected_number_of_parameters, |
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tuple_parameters) |
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local_logger.info(self.locale.gettext('Query with parameters interpreted is: %s') \ |
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.replace('%s', |
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self.class_bn.fn_multi_line_string_to_single(simulated_query))) |
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# actual execution of the query |
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in_cursor = self.class_dbt.execute_query(local_logger, self.timer, in_cursor, this_query, |
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expected_number_of_parameters, tuple_parameters) |
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# bringing the information from server (data transfer) |
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return { |
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'columns' : self.class_dbt.get_column_names(local_logger, self.timer, in_cursor), |
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'result_set': self.class_dbt.fetch_executed_query(local_logger, self.timer, in_cursor), |
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'rows_counted': in_cursor.rowcount, |
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} |
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def initiate_logger_and_timer(self): |
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# initiate logger |
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self.class_ln.initiate_logger(self.parameters.output_log_file, self.script) |
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# initiate localization specific for this script |
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# define global timer to use |
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self.timer = Timer(self.script, |
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text = self.locale.gettext('Time spent is {seconds}'), |
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logger = self.class_ln.logger.debug) |
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def load_configuration(self): |
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# load application configuration (inputs are defined into a json file) |
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ref_folder = os.path.dirname(__file__).replace('db_extractor', 'config') |
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config_file = os.path.join(ref_folder, 'db-extractor.json').replace('\\', '/') |
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self.config = self.class_fo.fn_open_file_and_get_content(config_file) |
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# get command line parameter values |
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self.parameters = self.class_clam.parse_arguments(self.config['input_options'][self.script]) |
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# checking inputs, if anything is invalid an exit(1) will take place |
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self.class_bn.fn_check_inputs(self.parameters) |
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# checking inputs, if anything is invalid an exit(1) will take place |
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self.class_bnfe.fn_check_inputs_specific(self.parameters) |
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def load_extraction_sequence_and_dependencies(self): |
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self.timer.start() |
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self.file_extract_sequence = self.class_fo.fn_open_file_and_get_content( |
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self.parameters.input_extracting_sequence_file, 'json') |
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self.class_ln.logger.info(self.locale.gettext( \ |
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'Configuration file name with extracting sequence(es) has been loaded')) |
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self.timer.stop() |
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# store file statistics |
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self.class_fo.fn_store_file_statistics(self.class_ln.logger, self.timer, |
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self.parameters.input_extracting_sequence_file, |
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self.locale.gettext('Configuration file name with ' |
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+ 'extracting sequence(es)')) |
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# get the source system details from provided file |
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self.timer.start() |
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self.source_systems = self.class_fo.fn_open_file_and_get_content( \ |
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self.parameters.input_source_system_file, 'json')['Systems'] |
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self.class_ln.logger.info(self.locale.gettext('Source Systems file name has been loaded')) |
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self.timer.stop() |
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self.class_fo.fn_store_file_statistics(self.class_ln.logger, self.timer, |
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self.parameters.input_source_system_file, |
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self.locale.gettext('Source Systems file name')) |
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# get the source system details from provided file |
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self.timer.start() |
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self.user_credentials = self.class_fo.fn_open_file_and_get_content( |
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self.parameters.input_credentials_file, 'json')['Credentials'] |
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self.class_ln.logger.info(self.locale.gettext( \ |
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'Configuration file name with credentials has been loaded')) |
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self.timer.stop() |
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self.class_fo.fn_store_file_statistics(self.class_ln.logger, self.timer, |
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self.parameters.input_credentials_file, |
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self.locale.gettext( \ |
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'Configuration file name with credentials')) |
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def load_query(self, crt_query): |
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self.timer.start() |
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query = self.class_fo.fn_open_file_and_get_content(crt_query['input-query-file'], 'raw') |
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feedback = self.locale.gettext('Generic query is: %s') \ |
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.replace('%s', self.class_bn.fn_multi_line_string_to_single(query)) |
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self.class_ln.logger.info(feedback) |
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self.timer.stop() |
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return query |
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def result_set_into_data_frame(self, local_logger, stats, crt_session): |
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result_df = self.class_dbt.result_set_to_data_frame(local_logger, self.timer, |
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stats['columns'], stats['result_set']) |
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rdf = self.class_dbt.append_additional_columns_to_df(local_logger, self.timer, |
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result_df, crt_session) |
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return rdf |
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def set_default_starting_weekday(self, crt_session): |
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if 'start-isoweekday' not in crt_session: |
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week_starts_with_isoweekday = 1 |
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if 'start_isoweekday' in crt_session: |
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week_starts_with_isoweekday = crt_session['start_isoweekday'] |
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return week_starts_with_isoweekday |
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def set_default_parameter_rules(self, crt_session): |
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if 'parameters-handling-rules' in crt_session: |
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dictionary_to_return = crt_session['parameters-handling-rules'] |
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else: |
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# assumption is for either DICT or LIST values are numeric |
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# in case text is given different rules have to be specified |
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dictionary_to_return = { |
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"dict-values-glue" : ", ", |
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"dict-values-prefix": "IN (", |
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"dict-values-suffix": ")", |
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"list-values-glue" : ", ", |
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"list-values-prefix": "", |
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"list-values-suffix": "" |
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} |
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return dictionary_to_return |
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def store_result_set_to_disk(self, local_logger, in_data_frame, crt_session): |
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output_file_setting_type = type(crt_session['output-file']) |
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if output_file_setting_type == dict: |
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self.class_dm.fn_store_data_frame_to_file(local_logger, self.timer, in_data_frame, |
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crt_session['output-file']) |
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self.class_fo.fn_store_file_statistics(local_logger, self.timer, |
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crt_session['output-file']['name'], |
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self.locale.gettext('Output file name')) |
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elif output_file_setting_type == list: |
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for crt_output in crt_session['output-file']: |
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self.class_dm.fn_store_data_frame_to_file(local_logger, self.timer, |
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in_data_frame, crt_output) |
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self.class_fo.fn_store_file_statistics(local_logger, self.timer, crt_output['name'], |
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self.locale.gettext('Output file name')) |
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danielgp /
db-extractor
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