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fix: connect method raises an exception when db problems #147

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fix: connect method raises an exception when db problems #147

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12 changes: 9 additions & 3 deletions web/modeltr/connection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,18 +100,21 @@ def __init__(self, **kwargs):
#self._connect()

def _connect(self):
for i in range(Settings.app['retries']['db_connection']):
retries = Settings.app['retries']['db_connection']
for i in range(retries):
try:
self.async_mode = True if 'async_mode' in self._connection_params else False
self.client = psycopg2.connect(self._connection_params['dsn'], async_=int(self.async_mode))
if self.async_mode:
Connection.__wait_for_completion(self.client)
self.acursor = self.client.cursor()
self._last_usage_timestamp = time.time()
break
except psycopg2.OperationalError:
self.__logger.warning('Error connecting to the db server', exc_info=True)
time.sleep(0.1)
self._last_usage_timestamp = time.time()
else:
raise UnitDbConnectionError(f'Error connecting to the db server after {retries} tries')

def _refresh_conn_on_every_usage(self):
return "socket_reusability" in self._connection_params and \
Expand All @@ -129,7 +132,10 @@ def wait_for_completion(self):
@classmethod
def connect(cls, alias=DEFAULT_CONNECTION_NAME, **kwargs):
if alias not in cls.__connections:
cls.__connections[alias] = {"connection": cls(**kwargs), "args": kwargs}
logging.getLogger(__name__).debug("Creating connection object...")
connection = cls(**kwargs)
logging.getLogger(__name__).debug(f"Connection object created.")
cls.__connections[alias] = {"connection": connection, "args": kwargs}
return cls.use(alias)

@classmethod
Expand Down