def _connect(self):
"""Try to connect to the database.
Raises:
:exc:`~ConnectionError`: If the connection to the database
fails.
"""
try:
# we should only return a connection if the replica set is
# initialized. initialize_replica_set will check if the
# replica set is initialized else it will initialize it.
initialize_replica_set(self.host, self.port, self.connection_timeout,
self.dbname, self.ssl, self.login, self.password)
# FYI: this might raise a `ServerSelectionTimeoutError`,
# that is a subclass of `ConnectionFailure`.
client = pymongo.MongoClient(self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout,
ssl=self.ssl)
if self.login is not None and self.password is not None:
client[self.dbname].authenticate(self.login, self.password)
return client
# `initialize_replica_set` might raise `ConnectionFailure` or `OperationFailure`.
except (pymongo.errors.ConnectionFailure,
pymongo.errors.OperationFailure) as exc:
if "Authentication fail" in str(exc):
raise AuthenticationError() from exc
raise ConnectionError() from exc
def _connect(self):
"""Try to connect to the database.
Raises:
:exc:`~ConnectionError`: If the connection to the database
fails.
"""
try:
# we should only return a connection if the replica set is
# initialized. initialize_replica_set will check if the
# replica set is initialized else it will initialize it.
initialize_replica_set(self.host, self.port,
self.connection_timeout)
# FYI: this might raise a `ServerSelectionTimeoutError`,
# that is a subclass of `ConnectionFailure`.
return pymongo.MongoClient(
self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout)
# `initialize_replica_set` might raise `ConnectionFailure` or `OperationFailure`.
except (pymongo.errors.ConnectionFailure,
pymongo.errors.OperationFailure) as exc:
raise ConnectionError() from exc
def _connect(self):
"""Try to connect to the database.
Raises:
:exc:`~ConnectionError`: If the connection to the database
fails.
:exc:`~AuthenticationError`: If there is a OperationFailure due to
Authentication failure after connecting to the database.
:exc:`~ConfigurationError`: If there is a ConfigurationError while
connecting to the database.
"""
try:
# FYI: the connection process might raise a
# `ServerSelectionTimeoutError`, that is a subclass of
# `ConnectionFailure`.
# The presence of ca_cert, certfile, keyfile, crlfile implies the
# use of certificates for TLS connectivity.
if self.ca_cert is None or self.certfile is None or \
self.keyfile is None or self.crlfile is None:
client = pymongo.MongoClient(
self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout,
ssl=self.ssl,
**MONGO_OPTS)
if self.login is not None and self.password is not None:
client[self.dbname].authenticate(self.login, self.password)
else:
logger.info('Connecting to MongoDB over TLS/SSL...')
client = pymongo.MongoClient(
self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout,
ssl=self.ssl,
ssl_ca_certs=self.ca_cert,
ssl_certfile=self.certfile,
ssl_keyfile=self.keyfile,
ssl_pem_passphrase=self.keyfile_passphrase,
ssl_crlfile=self.crlfile,
ssl_cert_reqs=CERT_REQUIRED,
**MONGO_OPTS)
if self.login is not None:
client[self.dbname].authenticate(self.login,
mechanism='MONGODB-X509')
return client
except (pymongo.errors.ConnectionFailure,
pymongo.errors.OperationFailure) as exc:
logger.info('Exception in _connect(): {}'.format(exc))
raise ConnectionError(str(exc)) from exc
except pymongo.errors.ConfigurationError as exc:
raise ConfigurationError from exc
def test_connection_failure():
from bigchaindb.backend.exceptions import ConnectionError
from bigchaindb.backend.mongodb.changefeed import run_changefeed
conn = mock.MagicMock()
conn.run.side_effect = [ConnectionError(), RuntimeError()]
changefeed = run_changefeed(conn, 'backlog', -1)
with pytest.raises(RuntimeError):
for record in changefeed:
assert False, 'Shouldn\'t get here'
def connect(self):
"""Try to connect to the database.
Raises:
:exc:`~ConnectionError`: If the connection to the database
fails.
"""
attempt = 0
for i in self.max_tries_counter:
attempt += 1
try:
self._conn = self._connect()
except ConnectionError as exc:
logger.warning('Attempt %s/%s. Connection to %s:%s failed after %sms.',
attempt, self.max_tries if self.max_tries != 0 else '∞',
self.host, self.port, self.connection_timeout)
if attempt == self.max_tries:
logger.critical('Cannot connect to the Database. Giving up.')
raise ConnectionError() from exc
else:
break
def initialize_replica_set(host, port, connection_timeout, dbname, ssl, login,
password, ca_cert, certfile, keyfile,
keyfile_passphrase, crlfile):
"""Initialize a replica set. If already initialized skip."""
# Setup a MongoDB connection
# The reason we do this instead of `backend.connect` is that
# `backend.connect` will connect you to a replica set but this fails if
# you try to connect to a replica set that is not yet initialized
try:
# The presence of ca_cert, certfile, keyfile, crlfile implies the
# use of certificates for TLS connectivity.
if ca_cert is None or certfile is None or keyfile is None or \
crlfile is None:
conn = pymongo.MongoClient(
host,
port,
serverselectiontimeoutms=connection_timeout,
ssl=ssl)
if login is not None and password is not None:
conn[dbname].authenticate(login, password)
else:
logger.info('Connecting to MongoDB over TLS/SSL...')
conn = pymongo.MongoClient(
host,
port,
serverselectiontimeoutms=connection_timeout,
ssl=ssl,
ssl_ca_certs=ca_cert,
ssl_certfile=certfile,
ssl_keyfile=keyfile,
ssl_pem_passphrase=keyfile_passphrase,
ssl_crlfile=crlfile,
ssl_cert_reqs=CERT_REQUIRED)
if login is not None:
logger.info('Authenticating to the database...')
conn[dbname].authenticate(login, mechanism='MONGODB-X509')
except (pymongo.errors.ConnectionFailure,
pymongo.errors.OperationFailure) as exc:
logger.info('Exception in _connect(): {}'.format(exc))
raise ConnectionError(str(exc)) from exc
except pymongo.errors.ConfigurationError as exc:
raise ConfigurationError from exc
_check_replica_set(conn)
host = '{}:{}'.format(bigchaindb.config['database']['host'],
bigchaindb.config['database']['port'])
config = {
'_id': bigchaindb.config['database']['replicaset'],
'members': [{
'_id': 0,
'host': host
}]
}
try:
conn.admin.command('replSetInitiate', config)
except pymongo.errors.OperationFailure as exc_info:
if exc_info.details['codeName'] == 'AlreadyInitialized':
return
raise
else:
_wait_for_replica_set_initialization(conn)
logger.info('Initialized replica set')
finally:
if conn is not None:
logger.info('Closing initial connection to MongoDB')
conn.close()
def _connect(self):
"""Try to connect to the database.
Raises:
:exc:`~ConnectionError`: If the connection to the database
fails.
:exc:`~AuthenticationError`: If there is a OperationFailure due to
Authentication failure after connecting to the database.
:exc:`~ConfigurationError`: If there is a ConfigurationError while
connecting to the database.
"""
try:
if self.replicaset:
# we should only return a connection if the replica set is
# initialized. initialize_replica_set will check if the
# replica set is initialized else it will initialize it.
initialize_replica_set(self.host, self.port,
self.connection_timeout, self.dbname,
self.ssl, self.login, self.password,
self.ca_cert, self.certfile,
self.keyfile, self.keyfile_passphrase,
self.crlfile)
# FYI: the connection process might raise a
# `ServerSelectionTimeoutError`, that is a subclass of
# `ConnectionFailure`.
# The presence of ca_cert, certfile, keyfile, crlfile implies the
# use of certificates for TLS connectivity.
if self.ca_cert is None or self.certfile is None or \
self.keyfile is None or self.crlfile is None:
client = pymongo.MongoClient(
self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout,
ssl=self.ssl,
**MONGO_OPTS)
if self.login is not None and self.password is not None:
client[self.dbname].authenticate(self.login, self.password)
else:
logger.info('Connecting to MongoDB over TLS/SSL...')
client = pymongo.MongoClient(
self.host,
self.port,
replicaset=self.replicaset,
serverselectiontimeoutms=self.connection_timeout,
ssl=self.ssl,
ssl_ca_certs=self.ca_cert,
ssl_certfile=self.certfile,
ssl_keyfile=self.keyfile,
ssl_pem_passphrase=self.keyfile_passphrase,
ssl_crlfile=self.crlfile,
ssl_cert_reqs=CERT_REQUIRED,
**MONGO_OPTS)
if self.login is not None:
client[self.dbname].authenticate(self.login,
mechanism='MONGODB-X509')
# Riddle&Code
# 2018-05-18
# adding parameter "atlas" to the "database" section of the configuration file
if self.atlas:
client = pymongo.MongoClient(self.atlas)
return client
# `initialize_replica_set` might raise `ConnectionFailure`,
# `OperationFailure` or `ConfigurationError`.
except (pymongo.errors.ConnectionFailure,
pymongo.errors.OperationFailure) as exc:
logger.info('Exception in _connect(): {}'.format(exc))
raise ConnectionError(str(exc)) from exc
except pymongo.errors.ConfigurationError as exc:
raise ConfigurationError from exc
