def _poll_connection(self, port_name, timeout=0):
""" Repeatedly attempt to open a connection to a Bolt server.
"""
t0 = monotonic()
profile = self.profiles[port_name]
log.debug("Trying to open connection to %s", profile)
errors = set()
again = True
wait = 0.1
while again:
try:
cx = Connection.open(profile)
except InvalidVersion as e:
log.info(
"Encountered invalid Neo4j version '%s'. Continuing anyway (this is a dev tool)",
e)
return None
except ConnectionUnavailable as e:
errors.add(" ".join(map(str, e.args)))
else:
if cx:
return cx
again = monotonic() - t0 < (timeout or 0)
if again:
sleep(wait)
wait *= 2
log.error("Could not open connection to %s (%r)", profile, errors)
raise ConnectionUnavailable("Could not open connection")
def __init__(self, profile=None, **settings):
profile = _ConnectionProfile(profile, **settings)
try:
self._cx = _Connection.open(profile)
except _ConnectionUnavailable as error:
raise_from(self.OperationalError("Connection unavailable"), error)
self._tx = None
self._db = None
def connection(connection_profile):
cx = Connection.open(connection_profile)
yield cx
cx.close()
def connection(service_profile):
cx = Connection.open(service_profile)
yield cx
cx.close()