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Added ability to access mongo oplog via a proxy #751

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Added ability to access mongo oplog via a proxy #751

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e863046
Added ability to access mongo oplog via mongos router/proxy
pratyus Oct 18, 2017
da7bb64
Added check to verify local.oplog.rs is readable
pratyus Oct 18, 2017
50f02cb
Updated comment wording
pratyus Oct 19, 2017
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35 changes: 28 additions & 7 deletions mongo_connector/connector.py
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,9 @@ def __init__(self, mongo_address, doc_managers=None, **kwargs):
# Timezone awareness
self.tz_aware = kwargs.get('tz_aware', False)

# If oplog access is via the proxy
self.is_oplog_proxy= kwargs.get('is_oplog_proxy', False)

# SSL keyword arguments to MongoClient.
ssl_certfile = kwargs.pop('ssl_certfile', None)
ssl_ca_certs = kwargs.pop('ssl_ca_certs', None)
Expand Down Expand Up @@ -215,7 +218,8 @@ def from_config(cls, config):
ssl_keyfile=config['ssl.sslKeyfile'],
ssl_ca_certs=config['ssl.sslCACerts'],
ssl_cert_reqs=config['ssl.sslCertificatePolicy'],
tz_aware=config['timezoneAware']
tz_aware=config['timezoneAware'],
is_oplog_proxy=config['isOplogProxy']
)
return connector

Expand Down Expand Up @@ -374,12 +378,19 @@ def run(self):
)
return

# Establish a connection to the replica set as a whole
self.main_conn.close()
self.main_conn = self.create_authed_client(
replicaSet=is_master['setName'])

self.update_version_from_client(self.main_conn)
if not self.is_oplog_proxy:
# Establish a connection to the replica set as a whole
self.main_conn.close()
self.main_conn = self.create_authed_client(
replicaSet=is_master['setName'])
self.update_version_from_client(self.main_conn)
else:
try:
# Check if local.oplog.rs is readable
self.main_conn.local.oplog.rs.find_one()
except pymongo.errors.OperationFailure:
LOG.error('Could not read local.oplog.rs!')
sys.exit(1)

# non sharded configuration
oplog = OplogThread(
Expand Down Expand Up @@ -486,6 +497,16 @@ def add_option(*args, **kwargs):
" would be a valid argument to `-m`. Don't use"
" quotes around the address.")

is_oplog_proxy = add_option(
config_key="isOplogProxy",
default=False,
type=bool)

is_oplog_proxy.add_cli(
"--is_oplog_proxy", dest="is_oplog_proxy", help=
"True if passed uri is a proxy with access to mongo"
"oplog.rs.")

oplog_file = add_option(
config_key="oplogFile",
default="oplog.timestamp",
Expand Down