def fail(md):
if md.get("code") == "Neo.ClientError.Procedure.ProcedureNotFound":
raise BoltRoutingError("Server does not support routing",
address)
else:
raise BoltRoutingError("Routing support broken on server",
address)
def fail(md):
from neo4j._exceptions import BoltRoutingError
if md.get("code") == "Neo.ClientError.Procedure.ProcedureNotFound":
raise BoltRoutingError("Server does not support routing",
self.unresolved_address)
else:
raise BoltRoutingError("Routing support broken on server",
self.unresolved_address)
def fail(md):
from neo4j._exceptions import BoltRoutingError
code = md.get("code")
if code == "Neo.ClientError.Database.DatabaseNotFound":
return # surface this error to the user
elif code == "Neo.ClientError.Procedure.ProcedureNotFound":
raise BoltRoutingError("Server does not support routing", self.unresolved_address)
else:
raise BoltRoutingError("Routing support broken on server", self.unresolved_address)
def fetch_routing_table(self, *, address, timeout, database):
""" Fetch a routing table from a given router address.
:param address: router address
:param timeout: seconds
:param database: the database name
:type: str
:return: a new RoutingTable instance or None if the given router is
currently unable to provide routing information
:raise neo4j.exceptions.ServiceUnavailable: if no writers are available
:raise neo4j._exceptions.BoltProtocolError: if the routing information received is unusable
"""
new_routing_info = self.fetch_routing_info(address=address,
timeout=timeout,
database=database)
if new_routing_info is None:
return None
elif not new_routing_info:
raise BoltRoutingError("Invalid routing table", address)
else:
servers = new_routing_info[0]["servers"]
ttl = new_routing_info[0]["ttl"]
new_routing_table = RoutingTable.parse_routing_info(
database=database, servers=servers, ttl=ttl)
# Parse routing info and count the number of each type of server
num_routers = len(new_routing_table.routers)
num_readers = len(new_routing_table.readers)
# num_writers = len(new_routing_table.writers)
# If no writers are available. This likely indicates a temporary state,
# such as leader switching, so we should not signal an error.
# No routers
if num_routers == 0:
raise BoltRoutingError("No routing servers returned from server",
address)
# No readers
if num_readers == 0:
raise BoltRoutingError("No read servers returned from server",
address)
# At least one of each is fine, so return this table
return new_routing_table