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""" |
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BasicNeeds - useful functions library |
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This library has functions useful to keep main logic short and simple |
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""" |
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# package to handle date and times |
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from datetime import date, datetime, timedelta |
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# package to use for checksum calculations (in this file) |
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import hashlib |
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# package to handle json files |
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import json |
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# package to handle files/folders and related metadata/operations |
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import os.path |
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# package regular expressions |
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import re |
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class BasicNeeds: |
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cfg_dtls = {} |
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def fn_check_inputs(self, input_parameters, input_script): |
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# checking log folder first as there's all further messages will be stored |
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self.fn_validate_single_value(os.path.dirname(input_parameters.output_log_file), 'folder', |
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'log file') |
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# checking input file as the main point of whole logic revolves around it |
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self.fn_validate_single_value(input_parameters.input_file, 'file', 'input file') |
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# checking script specific inputs |
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if input_script == 'converter': |
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self.fn_validate_single_value(os.path.dirname(input_parameters.output_file), 'folder', |
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'output file') |
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elif input_script == 'publish_data_source': |
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self.fn_validate_single_value(input_parameters.input_credentials_file, 'file', |
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'credentials file') |
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self.fn_validate_single_value(input_parameters.tableau_server, 'url', |
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'Tableau Server URL') |
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def fn_final_message(self, local_logger, log_file_name, performance_in_seconds): |
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total_time_string = str(timedelta(seconds=performance_in_seconds)) |
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if log_file_name == 'None': |
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self.fn_timestamped_print('Application finished, whole script took ' |
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+ total_time_string) |
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else: |
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local_logger.info(f'Total execution time was ' + total_time_string) |
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self.fn_timestamped_print('Application finished, ' |
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+ 'for complete logged details please check ' |
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+ log_file_name) |
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def fn_get_file_content(self, in_file_handler, in_content_type): |
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if in_content_type == 'json': |
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try: |
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json_interpreted_details = json.load(in_file_handler) |
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self.fn_timestamped_print('I have interpreted JSON structure from given file') |
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return json_interpreted_details |
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except Exception as e: |
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self.fn_timestamped_print('Error encountered when trying to interpret JSON') |
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print(e) |
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elif in_content_type == 'raw': |
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raw_interpreted_file = in_file_handler.read() |
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self.fn_timestamped_print('I have read file entire content') |
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return raw_interpreted_file |
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else: |
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self.fn_timestamped_print('Unknown content type provided, ' |
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+ 'expected either "json" or "raw" but got ' |
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+ in_content_type) |
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def fn_get_file_statitics(self, file_to_evaluate): |
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file_sha512 = hashlib.sha512(open(file_to_evaluate, 'r').read().encode()).hexdigest() |
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file_dates = { |
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'created': os.path.getctime(file_to_evaluate), |
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'modified': os.path.getctime(file_to_evaluate), |
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} |
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file_info = { |
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'date when created': date.strftime(datetime.fromtimestamp(file_dates['created']), |
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'%Y-%m-%d %H:%M:%S.%f'), |
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'date when last modified': date.strftime(datetime.fromtimestamp(file_dates['modified']), |
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'%Y-%m-%d %H:%M:%S.%f'), |
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'size [bytes]': os.path.getsize(file_to_evaluate), |
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'SHA512-Checksum': file_sha512, |
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} |
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return file_info |
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def fn_load_configuration(self): |
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relevant_file = os.path.join(os.path.dirname(__file__), 'config.json') |
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self.cfg_dtls = self.fn_open_file_and_get_content(relevant_file) |
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# adding a special case data type |
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self.cfg_dtls['data_types']['str'] = '' |
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def fn_open_file_and_get_content(self, input_file, content_type='json'): |
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if os.path.isfile(input_file): |
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with open(input_file, 'r') as file_handler: |
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self.fn_timestamped_print('I have opened file: ' + input_file) |
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return self.fn_get_file_content(file_handler, content_type) |
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else: |
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self.fn_timestamped_print('Given file ' + input_file |
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+ ' does not exist, please check your inputs!') |
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def fn_optional_print(self, boolean_variable, string_to_print): |
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if boolean_variable: |
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self.fn_timestamped_print(string_to_print) |
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def fn_store_file_statistics(self, local_logger, timmer, file_name, file_meaning): |
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timmer.start() |
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local_logger.info(file_meaning + ' file "' + file_name |
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+ '" has the following characteristics: ' |
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+ str(self.fn_get_file_statitics(file_name))) |
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timmer.stop() |
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@staticmethod |
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def fn_timestamped_print(string_to_print): |
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print(datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S.%f %Z") |
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+ ' - ' + string_to_print) |
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def fn_validate_single_value(self, value_to_validate, validation_type, name_meaning): |
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is_fatal_error = False |
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message = '' |
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if validation_type == 'file': |
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is_fatal_error = (not os.path.isfile(value_to_validate)) |
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message = 'Given ' + name_meaning + ' "' + value_to_validate \ |
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+ '" does not exist, please check your inputs!' |
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elif validation_type == 'folder': |
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is_fatal_error = (not os.path.isdir(value_to_validate)) |
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message = 'Given ' + name_meaning + ' "' + value_to_validate \ |
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+ '" does not exist, please check your inputs!' |
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elif validation_type == 'url': |
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url_reg_expression = 'https?://(?:www)?(?:[\\w-]{2,255}(?:\\.\\w{2,66}){1,2})' |
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is_fatal_error = (not re.match(url_reg_expression, value_to_validate)) |
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message = 'Given ' + name_meaning + ' "' + value_to_validate \ |
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+ '" does not seem a valid one, please check your inputs!' |
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if is_fatal_error: |
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self.fn_timestamped_print(message) |
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exit(1) |
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danielgp /
tableau-hyper-management
