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dr_debug_service.py
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dr_debug_service.py
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#import yaml
import flask
from flask import request, jsonify, request, send_from_directory
import concurrent.futures
import cx_Oracle
import yaml
import time
import logging
app = flask.Flask(__name__,
static_url_path='',
static_folder=''
)
app.config['DEBUG'] = True
app.config['ENV'] = 'development'
app.config['JSON_KEYS_SORT'] = False
logging.basicConfig(level=logging.DEBUG,
filemode='a',
format='{asctime} - {levelname} - [{funcName}:{lineno}] - {message}',
style='{')
"""
http://127.0.0.1:5000/t-rex/api/query?ENV=SIT&KEY=SVCORDER_ID&VALUE=23/%2045
"""
"""
Refer to below link for better reading on decorators
https://realpython.com/primer-on-python-decorators/#simple-decorators
"""
def perf(f):
def _perf(*args, **kwargs):
args_repr = [repr(a) for a in args]
kwargs_repr = [f"{k}={v!r}" for k, v in kwargs.items()]
signature = ", ".join(args_repr + kwargs_repr)
logging.debug('--> START - Calling {}({})'.format(f.__name__, signature))
start_time = time.perf_counter()
retVal = f(*args, **kwargs)
end_time = time.perf_counter()
run_time = end_time - start_time
logging.debug('--> END - {} - in {:.4f} secs'.format(f.__name__, run_time))
#logging.debug(f'--> END - {f.__name__!r} returned {retVal!r} - in {run_time:.4f} secs')
return retVal
return _perf
####################################################################################################################
@perf
class TRex:
def __init__(self, env, key, value):
logging.debug("Inside Trex constructor")
self._env = env
self._key = key
self._value = value
self._svc_order_id = ""
self._service_id = ""
self._trail_id = 0
self._db_conn = {}
self._db_keys = {}
self._db_keys[self._key] = self._value
self._results = {'env':self._env,
'key':self._key,
'value':self._value
}
def results(self, results = None):
if results != None :
self._results = results
return self._results
@perf
def _load_init_keys(self):
"""
Place holder function to load other KEY's, based on the given key.
Database is already opened during this time and the DEFAULT connection can be used for the same
"""
self._db_keys['DEPTNO'] = "10,20,30,40"
self._db_keys['GRADE'] = "1,2,3,4,5"
def _is_open(self, conn):
try:
logging.debug(f'Checking connection status')
return True
except cx_Oracle.Error as error:
logging.error(error)
def _handle_db_connection(self, list_of_domain_conn):
try:
domain_name, db_conn = list_of_domain_conn
logging.debug("Inside {}".format(list_of_domain_conn))
if domain_name not in self._db_conn:
logging.debug('DB Connection = {}'.format(db_conn))
connection = cx_Oracle.connect(db_conn)
self._db_conn[domain_name] = connection
logging.debug('Total connections [{}] so far are {}'.format(len(self._db_conn), self._db_conn))
elif domain_name in self._db_conn:
if self._is_open(self._db_conn[domain_name]):
logging.debug(f'Closing the DB connection for {self._db_conn[domain_name]}')
self._db_conn[domain_name].close()
else:
logging.debug(f'DB connection already close for for {self._db_conn[domain_name]}')
self._db_conn.popitem(domain_name)
except cx_Oracle.Error as error:
logging.error(error)
@perf
def _handle_db_connections(self):
try:
"""
You can let Python automatically closes the connection when the reference to the connection goes out of scope by using the `with` block:
"""
with open(r'config.yaml') as file:
documents = yaml.full_load(file)
if self._env in documents:
with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
executor.map(self._handle_db_connection, list(documents[self._env].items()))
except Exception as error:
logging.error(error)
@perf
def _fetch_records_per_table(self, cur, p_table_name, p_key, p_table_wclause):
try:
logging.debug(f'Table name is [{p_table_name}] : kEY is [{p_key}] : wClause is [{p_table_wclause}]')
if p_table_wclause is None:
query = "SELECT * FROM {} WHERE {} in ({})".format(p_table_name,
p_key,
self._db_keys[p_key] if p_key in self._db_keys else None)
else:
query = "SELECT * FROM {} {} ({})".format(p_table_name,
p_table_wclause,
self._db_keys[p_key] if p_key in self._db_keys else None)
logging.debug('Query is [{}]'.format(query))
cur.execute(query)
logging.debug(f'Columns for {p_table_name} are {[row[0] for row in cur.description]}')
records = [[row[0] for row in cur.description]]
for itr in cur:
records.append(list(itr))
logging.debug(f'Final Data for {p_table_name} are {records}')
return records
except cx_Oracle.Error as error:
logging.error(error)
@perf
def _fetch_records_per_domain(self, domain_name, list_tables):
try:
logging.debug('Domain name is {}'.format(domain_name))
if domain_name in self._db_conn:
connection = self._db_conn[domain_name]
# show the version of the Oracle Database
logging.debug(connection.version)
cur = connection.cursor()
for itrTables in list_tables:
table_name = itrTables['NAME'] if 'NAME' in itrTables else None
table_key = itrTables['KEY'] if 'KEY' in itrTables else None
table_wclause = itrTables['EXPLICIT_WCLAUSE'] if 'EXPLICIT_WCLAUSE' in itrTables else None
db_results = self._fetch_records_per_table(cur, table_name, table_key, table_wclause)
if domain_name not in self._results:
self._results[domain_name] = {}
self._results[domain_name][table_name] = db_results
except cx_Oracle.Error as error:
logging.error(error)
@perf
def processAPI(self):
self._load_init_keys()
self._handle_db_connections()
with open(r'tables.yaml') as file:
documents = yaml.full_load(file)
if 'domains' in documents:
for itrDomains in documents['domains']:
domain_name = itrDomains['name'] if 'name' in itrDomains else None
if 'tables' in itrDomains:
self._fetch_records_per_domain(domain_name, itrDomains['tables'])
self._handle_db_connections()
####################################################################################################################
@perf
@app.route('/', methods=['GET'])
def root():
logging.debug('Entering root')
return app.send_static_file('index.html')
# TODO - Try making this a json input rather than a query parameter
@perf
@app.route('/t-rex/api/query', methods=['GET'])
def query():
####################################################################################################################
logging.debug('Is json Request: {}'.format(request.is_json))
try:
if request.args:
p_env = request.args['ENV'] if 'ENV' in request.args else 'None'
p_key = request.args['KEY'] if 'KEY' in request.args else 'None'
p_value = request.args['VALUE'] if 'VALUE' in request.args else 'None'
logging.debug('ENV - type(p_env) = {} - value = {}'.format(type(p_env), p_env) )
logging.debug('KEY - type(p_key) = {} - value = {}'.format(type(p_key), p_key))
logging.debug('VALUE - type(p_value) = {} - value = {}'.format(type(p_value), p_value))
if p_env == 'None' or p_key == 'None' or p_value == 'None' :
## TODO - see if we can comeup with an exception class and properly passon the message. currently, status code is missing
## https://flask.palletsprojects.com/en/1.1.x/patterns/apierrors/
raise Exception('Invalid Parameters')
####################################################################################################################
objTRex = TRex(p_env, p_key, p_value)
objTRex.processAPI()
logging.debug(f'Final Results are {objTRex.results()}')
####################################################################################################################
except Exception as e:
logging.error('Error: {}'.format(e))
raise jsonify('Error: {}'.format(e))
else:
logging.debug('There is NO exception')
return jsonify(objTRex.results())
def main():
logging.debug("Hello!")
app.config["DEBUG"] = True
if __name__ == "__main__": main()
app.run()