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use abc.abstractproperty

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This gives clearer messages when someone gets it wrong
This commit is contained in:
Richard van der Hoff 2018-08-28 17:10:43 +01:00
parent 71990b3cae
commit 32eb1dedd2
1 changed files with 4 additions and 5 deletions
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9
synapse/server.py
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@ -19,6 +19,7 @@
# partial one for unit test mocking. # partial one for unit test mocking.
# Imports required for the default HomeServer() implementation # Imports required for the default HomeServer() implementation
import abc
import logging import logging
from twisted.enterprise import adbapi from twisted.enterprise import adbapi
@ -110,6 +111,8 @@ class HomeServer(object):
config (synapse.config.homeserver.HomeserverConfig): config (synapse.config.homeserver.HomeserverConfig):
""" """
__metaclass__ = abc.ABCMeta
DEPENDENCIES = [ DEPENDENCIES = [
'http_client', 'http_client',
'db_pool', 'db_pool',
@ -174,7 +177,7 @@ class HomeServer(object):
# This is overridden in derived application classes # This is overridden in derived application classes
# (such as synapse.app.homeserver.SynapseHomeServer) and gives the class to be # (such as synapse.app.homeserver.SynapseHomeServer) and gives the class to be
# instantiated during setup() for future return by get_datastore() # instantiated during setup() for future return by get_datastore()
DATASTORE_CLASS = None DATASTORE_CLASS = abc.abstractproperty()
def __init__(self, hostname, reactor=None, **kwargs): def __init__(self, hostname, reactor=None, **kwargs):
""" """
@ -200,10 +203,6 @@ class HomeServer(object):
def setup(self): def setup(self):
logger.info("Setting up.") logger.info("Setting up.")
if self.DATASTORE_CLASS is None:
raise RuntimeError("%s does not define a DATASTORE_CLASS" % (
self.__class__.__name__,
))
with self.get_db_conn() as conn: with self.get_db_conn() as conn:
self.datastore = self.DATASTORE_CLASS(conn, self) self.datastore = self.DATASTORE_CLASS(conn, self)
logger.info("Finished setting up.") logger.info("Finished setting up.")