|
1
|
|
|
""" |
|
2
|
|
|
main class to support Extract script |
|
3
|
|
|
""" |
|
4
|
|
|
# useful methods to measure time performance by small pieces of code |
|
5
|
|
|
from codetiming import Timer |
|
6
|
|
|
# package to facilitate operating system operations |
|
7
|
|
|
import os |
|
8
|
|
|
# package to add support for multi-language (i18n) |
|
9
|
|
|
import gettext |
|
10
|
|
|
# package to facilitate working with directories and files |
|
11
|
|
|
from pathlib import Path |
|
12
|
|
|
# custom classes specific to this project |
|
13
|
|
|
from db_extractor.BasicNeeds import BasicNeeds |
|
14
|
|
|
from db_extractor.CommandLineArgumentsManagement import CommandLineArgumentsManagement |
|
15
|
|
|
from db_extractor.DataInputOutput import DataInputOutput |
|
16
|
|
|
from db_extractor.DataManipulator import DataManipulator |
|
17
|
|
|
from db_extractor.FileOperations import FileOperations |
|
18
|
|
|
from db_extractor.LoggingNeeds import LoggingNeeds |
|
19
|
|
|
from db_extractor.ParameterHandling import ParameterHandling |
|
20
|
|
|
from db_extractor.BasicNeedsForExtractor import BasicNeedsForExtractor |
|
21
|
|
|
from db_extractor.DatabaseTalker import DatabaseTalker |
|
22
|
|
|
|
|
23
|
|
|
|
|
24
|
|
|
class ExtractNeeds: |
|
25
|
|
|
class_bn = None |
|
26
|
|
|
class_bnfe = None |
|
27
|
|
|
class_clam = None |
|
28
|
|
|
class_dbt = None |
|
29
|
|
|
class_dio = None |
|
30
|
|
|
class_dm = None |
|
31
|
|
|
class_fo = None |
|
32
|
|
|
class_ln = None |
|
33
|
|
|
class_ph = None |
|
34
|
|
|
config = None |
|
35
|
|
|
file_extract_sequence = None |
|
36
|
|
|
locale = None |
|
37
|
|
|
parameters = None |
|
38
|
|
|
script = None |
|
39
|
|
|
source_systems = None |
|
40
|
|
|
timer = None |
|
41
|
|
|
user_credentials = None |
|
42
|
|
|
|
|
43
|
|
|
def __init__(self, destination_script, in_language='en_US'): |
|
44
|
|
|
self.script = destination_script |
|
45
|
|
|
current_file_basename = os.path.basename(__file__).replace('.py', '') |
|
46
|
|
|
lang_folder = os.path.join(os.path.dirname(__file__), current_file_basename + '_Locale') |
|
47
|
|
|
self.locale = gettext.translation( |
|
48
|
|
|
current_file_basename, lang_folder, languages=[in_language]) |
|
49
|
|
|
# instantiate Basic Needs class |
|
50
|
|
|
self.class_bn = BasicNeeds(in_language) |
|
51
|
|
|
# instantiate Extractor Specific Needs class |
|
52
|
|
|
self.class_bnfe = BasicNeedsForExtractor(in_language) |
|
53
|
|
|
# instantiate File Operations class |
|
54
|
|
|
self.class_fo = FileOperations(in_language) |
|
55
|
|
|
# instantiate File Operations class |
|
56
|
|
|
self.class_dbt = DatabaseTalker(in_language) |
|
57
|
|
|
# instantiate Data Manipulator class, useful to manipulate data frames |
|
58
|
|
|
self.class_dio = DataInputOutput(in_language) |
|
59
|
|
|
# instantiate Data Manipulator class, useful to manipulate data frames |
|
60
|
|
|
self.class_dm = DataManipulator(in_language) |
|
61
|
|
|
# instantiate Command Line Arguments class |
|
62
|
|
|
self.class_clam = CommandLineArgumentsManagement(in_language) |
|
63
|
|
|
# instantiate Logger class |
|
64
|
|
|
self.class_ln = LoggingNeeds() |
|
65
|
|
|
# instantiate Parameter Handling class |
|
66
|
|
|
self.class_ph = ParameterHandling(in_language) |
|
67
|
|
|
|
|
68
|
|
|
def close_connection(self, local_logger): |
|
69
|
|
|
self.timer.start() |
|
70
|
|
|
local_logger.info(self.locale.gettext('Closing DB connection')) |
|
71
|
|
|
self.class_dbt.connection.close() |
|
72
|
|
|
local_logger.info(self.locale.gettext('Closing DB completed')) |
|
73
|
|
|
self.timer.stop() |
|
74
|
|
|
|
|
75
|
|
|
def close_cursor(self, local_logger, in_cursor): |
|
76
|
|
|
self.timer.start() |
|
77
|
|
|
local_logger.info(self.locale.gettext('Free DB result-set started')) |
|
78
|
|
|
in_cursor.close() |
|
79
|
|
|
local_logger.info(self.locale.gettext('Free DB result-set completed')) |
|
80
|
|
|
self.timer.stop() |
|
81
|
|
|
|
|
82
|
|
|
def evaluate_extraction_overwrite_condition(self, extraction_required, in_dict): |
|
83
|
|
|
if in_dict['session']['extract-behaviour'] == 'overwrite-if-output-file-exists' \ |
|
84
|
|
|
and 'extract-overwrite-condition' in in_dict['session'] \ |
|
85
|
|
|
and Path(in_dict['file']['name']).is_file(): |
|
86
|
|
|
fv = self.class_bnfe.fn_is_extraction_necessary_additional( |
|
87
|
|
|
self.class_ln.logger, self.class_ph, self.class_fo, in_dict) |
|
88
|
|
|
extraction_required = False |
|
89
|
|
|
new_verdict = self.locale.gettext('not required') |
|
90
|
|
|
if fv == self.class_fo.locale.gettext('older'): |
|
91
|
|
|
extraction_required = True |
|
92
|
|
|
new_verdict = self.locale.gettext('required') |
|
93
|
|
|
self.class_ln.logger.debug(self.locale.gettext( |
|
94
|
|
|
'Additional evaluation took place and new verdict is: {new_verdict}') |
|
95
|
|
|
.replace('{new_verdict}', new_verdict)) |
|
96
|
|
|
return extraction_required |
|
97
|
|
|
|
|
98
|
|
|
def evaluate_if_extraction_is_required(self, in_dict): |
|
99
|
|
|
extraction_required = False |
|
100
|
|
|
if type(in_dict['session']['output-file']) == dict: |
|
101
|
|
|
extraction_required = self.evaluate_if_extraction_is_required_for_single_file({ |
|
102
|
|
|
'session': in_dict['session'], |
|
103
|
|
|
'query': in_dict['query'], |
|
104
|
|
|
'sequence': in_dict['sequence'], |
|
105
|
|
|
'file': in_dict['session']['output-file'], |
|
106
|
|
|
}) |
|
107
|
|
|
elif type(in_dict['session']['output-file']) == list: |
|
108
|
|
|
extraction_required = self.evaluate_if_extraction_is_required_list(in_dict) |
|
109
|
|
|
return extraction_required |
|
110
|
|
|
|
|
111
|
|
|
def evaluate_if_extraction_is_required_list(self, in_dict): |
|
112
|
|
|
evaluated_extraction = {} |
|
113
|
|
|
for crt_file in in_dict['session']['output-file']: |
|
114
|
|
|
crt_eval = self.evaluate_if_extraction_is_required_for_single_file({ |
|
115
|
|
|
'session': in_dict['session'], |
|
116
|
|
|
'query': in_dict['query'], |
|
117
|
|
|
'sequence': in_dict['sequence'], |
|
118
|
|
|
'file': crt_file, |
|
119
|
|
|
}) |
|
120
|
|
|
evaluated_extraction.update({str(crt_file['name']): crt_eval}) |
|
121
|
|
|
extraction_required = self.class_bn.fn_evaluate_dict_values(evaluated_extraction) |
|
122
|
|
|
self.class_ln.logger.debug(evaluated_extraction) |
|
123
|
|
|
overall_verdict = self.locale.gettext('not required') |
|
124
|
|
|
if extraction_required: |
|
125
|
|
|
overall_verdict = self.locale.gettext('required') |
|
126
|
|
|
self.class_ln.logger.debug(self.locale.gettext( |
|
127
|
|
|
'Overall new verdict after considering multiple files is: {overall_verdict}') |
|
128
|
|
|
.replace('{overall_verdict}', overall_verdict)) |
|
129
|
|
|
return extraction_required |
|
130
|
|
|
|
|
131
|
|
|
def evaluate_if_extraction_is_required_for_single_file(self, in_dict): |
|
132
|
|
|
in_dict['file']['name'] = self.class_ph.eval_expression( |
|
133
|
|
|
self.class_ln.logger, in_dict['file']['name'], in_dict['session']['start-iso-weekday']) |
|
134
|
|
|
e_dict = { |
|
135
|
|
|
'extract-behaviour': in_dict['session']['extract-behaviour'], |
|
136
|
|
|
'output-csv-file': in_dict['file']['name'], |
|
137
|
|
|
} |
|
138
|
|
|
extraction_required = self.class_bnfe.fn_is_extraction_necessary( |
|
139
|
|
|
self.class_ln.logger, e_dict) |
|
140
|
|
|
extraction_required = self.evaluate_extraction_overwrite_condition( |
|
141
|
|
|
extraction_required, in_dict) |
|
142
|
|
|
return extraction_required |
|
143
|
|
|
|
|
144
|
|
|
def extract_query_to_result_set(self, local_logger, in_cursor, in_dictionary): |
|
145
|
|
|
this_session = in_dictionary['session'] |
|
146
|
|
|
this_query = in_dictionary['query'] |
|
147
|
|
|
# get query parameters into a tuple |
|
148
|
|
|
tuple_parameters = self.class_ph.handle_query_parameters( |
|
149
|
|
|
local_logger, this_session, this_session['start-iso-weekday']) |
|
150
|
|
|
# measure expected number of parameters |
|
151
|
|
|
expected_no_of_parameters = str(this_query).count('%s') |
|
152
|
|
|
# simulate final query to log (useful for debugging purposes) |
|
153
|
|
|
simulated_query = self.class_ph.simulate_final_query( |
|
154
|
|
|
local_logger, self.timer, this_query, expected_no_of_parameters, tuple_parameters) |
|
155
|
|
|
simulated_query_single_line = self.class_bn.fn_multi_line_string_to_single(simulated_query) |
|
156
|
|
|
local_logger.info(self.locale.gettext('Query with parameters interpreted is: %s') |
|
157
|
|
|
.replace('%s', simulated_query_single_line)) |
|
158
|
|
|
# actual execution of the query |
|
159
|
|
|
in_cursor = self.class_dbt.execute_query( |
|
160
|
|
|
local_logger, self.timer, in_cursor, this_query, |
|
161
|
|
|
expected_no_of_parameters, tuple_parameters) |
|
162
|
|
|
# bringing the information from server (data transfer) |
|
163
|
|
|
dict_to_return = { |
|
164
|
|
|
'rows_counted': 0 |
|
165
|
|
|
} |
|
166
|
|
|
if in_cursor is not None: |
|
167
|
|
|
dict_to_return = { |
|
168
|
|
|
'columns': self.class_dbt.get_column_names(local_logger, self.timer, in_cursor), |
|
169
|
|
|
'result_set': self.class_dbt.fetch_executed_query( |
|
170
|
|
|
local_logger, self.timer, in_cursor), |
|
171
|
|
|
'rows_counted': in_cursor.rowcount, |
|
172
|
|
|
} |
|
173
|
|
|
return dict_to_return |
|
174
|
|
|
|
|
175
|
|
|
def initiate_logger_and_timer(self): |
|
176
|
|
|
# initiate logger |
|
177
|
|
|
self.class_ln.initiate_logger(self.parameters.output_log_file, self.script) |
|
178
|
|
|
# initiate localization specific for this script |
|
179
|
|
|
# define global timer to use |
|
180
|
|
|
self.timer = Timer(self.script, |
|
181
|
|
|
text=self.locale.gettext('Time spent is {seconds}'), |
|
182
|
|
|
logger=self.class_ln.logger.debug) |
|
183
|
|
|
|
|
184
|
|
|
def load_configuration(self): |
|
185
|
|
|
# load application configuration (inputs are defined into a json file) |
|
186
|
|
|
ref_folder = os.path.dirname(__file__).replace('db_extractor', 'config') |
|
187
|
|
|
config_file = os.path.join(ref_folder, 'db-extractor.json').replace('\\', '/') |
|
188
|
|
|
self.config = self.class_fo.fn_open_file_and_get_content(config_file) |
|
189
|
|
|
# get command line parameter values |
|
190
|
|
|
self.parameters = self.class_clam.parse_arguments(self.config['input_options'][self.script]) |
|
191
|
|
|
# checking inputs, if anything is invalid an exit(1) will take place |
|
192
|
|
|
self.class_bn.fn_check_inputs(self.parameters) |
|
193
|
|
|
# checking inputs, if anything is invalid an exit(1) will take place |
|
194
|
|
|
self.class_bnfe.fn_check_inputs_specific(self.parameters) |
|
195
|
|
|
|
|
196
|
|
|
def load_extraction_sequence_and_dependencies(self): |
|
197
|
|
|
self.timer.start() |
|
198
|
|
|
self.file_extract_sequence = self.class_fo.fn_open_file_and_get_content( |
|
199
|
|
|
self.parameters.input_extracting_sequence_file, 'json') |
|
200
|
|
|
self.class_ln.logger.info(self.locale.gettext( |
|
201
|
|
|
'Configuration file name with extracting sequence(es) has been loaded')) |
|
202
|
|
|
self.timer.stop() |
|
203
|
|
|
# store file statistics |
|
204
|
|
|
self.class_fo.fn_store_file_statistics( |
|
205
|
|
|
self.class_ln.logger, self.timer, self.parameters.input_extracting_sequence_file, |
|
206
|
|
|
self.locale.gettext('Configuration file name with extracting sequence(es)')) |
|
207
|
|
|
# get the source system details from provided file |
|
208
|
|
|
self.timer.start() |
|
209
|
|
|
self.source_systems = self.class_fo.fn_open_file_and_get_content( |
|
210
|
|
|
self.parameters.input_source_system_file, 'json')['Systems'] |
|
211
|
|
|
self.class_ln.logger.info(self.locale.gettext('Source Systems file name has been loaded')) |
|
212
|
|
|
self.timer.stop() |
|
213
|
|
|
self.class_fo.fn_store_file_statistics( |
|
214
|
|
|
self.class_ln.logger, self.timer, self.parameters.input_source_system_file, |
|
215
|
|
|
self.locale.gettext('Source Systems file name')) |
|
216
|
|
|
# get the source system details from provided file |
|
217
|
|
|
self.timer.start() |
|
218
|
|
|
self.user_credentials = self.class_fo.fn_open_file_and_get_content( |
|
219
|
|
|
self.parameters.input_credentials_file, 'json')['Credentials'] |
|
220
|
|
|
self.class_ln.logger.info(self.locale.gettext( |
|
221
|
|
|
'Configuration file name with credentials has been loaded')) |
|
222
|
|
|
self.timer.stop() |
|
223
|
|
|
self.class_fo.fn_store_file_statistics( |
|
224
|
|
|
self.class_ln.logger, self.timer, self.parameters.input_credentials_file, |
|
225
|
|
|
self.locale.gettext('Configuration file name with credentials')) |
|
226
|
|
|
|
|
227
|
|
|
def load_query(self, crt_query): |
|
228
|
|
|
self.timer.start() |
|
229
|
|
|
query = self.class_fo.fn_open_file_and_get_content(crt_query['input-query-file'], 'raw') |
|
230
|
|
|
feedback = self.locale.gettext('Generic query is: %s') \ |
|
231
|
|
|
.replace('%s', self.class_bn.fn_multi_line_string_to_single(query)) |
|
232
|
|
|
self.class_ln.logger.info(feedback) |
|
233
|
|
|
self.timer.stop() |
|
234
|
|
|
return query |
|
235
|
|
|
|
|
236
|
|
|
@staticmethod |
|
237
|
|
|
def pack_three_levels(in_session, in_query, in_sequence): |
|
238
|
|
|
return { |
|
239
|
|
|
'session': in_session, |
|
240
|
|
|
'query': in_query, |
|
241
|
|
|
'sequence': in_sequence, |
|
242
|
|
|
} |
|
243
|
|
|
|
|
244
|
|
|
def result_set_to_disk_file(self, local_logger, stats, in_dict): |
|
245
|
|
|
result_df = self.class_dbt.result_set_to_data_frame( |
|
246
|
|
|
local_logger, self.timer, stats['columns'], stats['result_set']) |
|
247
|
|
|
if 'additional-columns' in in_dict['session']: |
|
248
|
|
|
if in_dict['session']['additional-columns'] == 'inherit-from-parent': |
|
249
|
|
|
in_dict['session']['additional-columns'] = in_dict['query']['additional-columns'] |
|
250
|
|
|
elif in_dict['session']['additional-columns'] == 'inherit-from-grand-parent': |
|
251
|
|
|
in_dict['session']['additional-columns'] = in_dict['sequence']['additional-columns'] |
|
252
|
|
|
result_df = self.class_dbt.append_additional_columns_to_df( |
|
253
|
|
|
local_logger, self.timer, result_df, in_dict['session']) |
|
254
|
|
|
self.store_result_set_to_disk(self.class_ln.logger, result_df, in_dict['session']) |
|
255
|
|
|
|
|
256
|
|
|
@staticmethod |
|
257
|
|
|
def set_default_starting_weekday(in_dict): |
|
258
|
|
|
week_starts_with_iso_weekday = 1 |
|
259
|
|
|
if 'start-iso-weekday' in in_dict['session']: |
|
260
|
|
|
if in_dict['session']['start-iso-weekday'] == 'inherit-from-parent': |
|
261
|
|
|
in_dict['session']['start-iso-weekday'] = in_dict['query']['start-iso-weekday'] |
|
262
|
|
|
elif in_dict['session']['start-iso-weekday'] == 'inherit-from-grand-parent': |
|
263
|
|
|
in_dict['session']['start-iso-weekday'] = in_dict['sequence']['start-iso-weekday'] |
|
264
|
|
|
week_starts_with_iso_weekday = in_dict['session']['start-iso-weekday'] |
|
265
|
|
|
return week_starts_with_iso_weekday |
|
266
|
|
|
|
|
267
|
|
|
@staticmethod |
|
268
|
|
|
def set_default_parameter_rules(in_dict): |
|
269
|
|
|
# assumption is for either DICT or LIST values are numeric |
|
270
|
|
|
# in case text is given different rules have to be specified |
|
271
|
|
|
dictionary_to_return = { |
|
272
|
|
|
"dict-values-glue": ", ", |
|
273
|
|
|
"dict-values-prefix": "IN (", |
|
274
|
|
|
"dict-values-suffix": ")", |
|
275
|
|
|
"list-values-glue": ", ", |
|
276
|
|
|
"list-values-prefix": "", |
|
277
|
|
|
"list-values-suffix": "" |
|
278
|
|
|
} |
|
279
|
|
|
if 'parameters-handling-rules' in in_dict['session']: |
|
280
|
|
|
dictionary_to_return = in_dict['session']['parameters-handling-rules'] |
|
281
|
|
|
if dictionary_to_return == 'inherit-from-parent': |
|
282
|
|
|
dictionary_to_return = in_dict['query']['parameters-handling-rules'] |
|
283
|
|
|
elif dictionary_to_return == 'inherit-from-grand-parent': |
|
284
|
|
|
dictionary_to_return = in_dict['sequence']['parameters-handling-rules'] |
|
285
|
|
|
return dictionary_to_return |
|
286
|
|
|
|
|
287
|
|
|
def store_result_set_to_disk(self, local_logger, in_data_frame, crt_session): |
|
288
|
|
|
output_file_setting_type = type(crt_session['output-file']) |
|
289
|
|
|
if output_file_setting_type == dict: |
|
290
|
|
|
self.class_dio.fn_store_data_frame_to_file( |
|
291
|
|
|
local_logger, self.timer, in_data_frame, crt_session['output-file']) |
|
292
|
|
|
self.class_fo.fn_store_file_statistics( |
|
293
|
|
|
local_logger, self.timer, crt_session['output-file']['name'], |
|
294
|
|
|
self.locale.gettext('Output file name')) |
|
295
|
|
|
elif output_file_setting_type == list: |
|
296
|
|
|
for crt_output in crt_session['output-file']: |
|
297
|
|
|
self.class_dio.fn_store_data_frame_to_file( |
|
298
|
|
|
local_logger, self.timer, in_data_frame, crt_output) |
|
299
|
|
|
self.class_fo.fn_store_file_statistics( |
|
300
|
|
|
local_logger, self.timer, crt_output['name'], |
|
301
|
|
|
self.locale.gettext('Output file name')) |
|
302
|
|
|
|
danielgp /
db-extractor
