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"""
Replica set fixture for executing JSTests against.
"""
from __future__ import absolute_import
import os.path
import time
import pymongo
from . import interface
from . import standalone
from ... import config
from ... import logging
from ... import utils
class ReplicaSetFixture(interface.ReplFixture):
"""
Fixture which provides JSTests with a replica set to run against.
"""
def __init__(self,
logger,
job_num,
mongod_executable=None,
mongod_options=None,
dbpath_prefix=None,
preserve_dbpath=False,
num_nodes=2,
auth_options=None,
replset_config_options=None,
voting_secondaries=False,
use_replica_set_connection_string=False):
interface.ReplFixture.__init__(self, logger, job_num)
self.mongod_executable = mongod_executable
self.mongod_options = utils.default_if_none(mongod_options, {})
self.preserve_dbpath = preserve_dbpath
self.num_nodes = num_nodes
self.auth_options = auth_options
self.replset_config_options = utils.default_if_none(replset_config_options, {})
self.voting_secondaries = voting_secondaries
self.use_replica_set_connection_string = use_replica_set_connection_string
# The dbpath in mongod_options is used as the dbpath prefix for replica set members and
# takes precedence over other settings. The ShardedClusterFixture uses this parameter to
# create replica sets and assign their dbpath structure explicitly.
if "dbpath" in self.mongod_options:
self._dbpath_prefix = self.mongod_options.pop("dbpath")
else:
# Command line options override the YAML configuration.
dbpath_prefix = utils.default_if_none(config.DBPATH_PREFIX, dbpath_prefix)
dbpath_prefix = utils.default_if_none(dbpath_prefix, config.DEFAULT_DBPATH_PREFIX)
self._dbpath_prefix = os.path.join(dbpath_prefix,
"job%d" % (self.job_num),
config.FIXTURE_SUBDIR)
self.nodes = []
self.replset_name = None
def setup(self):
self.replset_name = self.mongod_options.get("replSet", "rs")
if not self.nodes:
for i in xrange(self.num_nodes):
node = self._new_mongod(i, self.replset_name)
self.nodes.append(node)
for node in self.nodes:
node.setup()
self.port = self.get_primary().port
# Call await_ready() on each of the nodes here because we want to start the election as
# soon as possible.
for node in self.nodes:
node.await_ready()
# Initiate the replica set.
members = []
for (i, node) in enumerate(self.nodes):
member_info = {"_id": i, "host": node.get_internal_connection_string()}
if i > 0:
member_info["priority"] = 0
if i >= 7 or not self.voting_secondaries:
# Only 7 nodes in a replica set can vote, so the other members must still be
# non-voting when this fixture is configured to have voting secondaries.
member_info["votes"] = 0
members.append(member_info)
initiate_cmd_obj = {"replSetInitiate": {"_id": self.replset_name, "members": members}}
client = utils.new_mongo_client(port=self.port)
if self.auth_options is not None:
auth_db = client[self.auth_options["authenticationDatabase"]]
auth_db.authenticate(self.auth_options["username"],
password=self.auth_options["password"],
mechanism=self.auth_options["authenticationMechanism"])
if self.replset_config_options.get("configsvr", False):
initiate_cmd_obj["replSetInitiate"]["configsvr"] = True
self.logger.info("Issuing replSetInitiate command...")
client.admin.command(initiate_cmd_obj)
def await_ready(self):
# Wait for the primary to be elected.
client = utils.new_mongo_client(port=self.port)
while True:
self.logger.info("Waiting for primary on port %d to be elected.", self.port)
is_master = client.admin.command("isMaster")["ismaster"]
if is_master:
break
time.sleep(0.1) # Wait a little bit before trying again.
self.logger.info("Primary on port %d successfully elected.", self.port)
# Wait for the secondaries to become available.
for secondary in self.get_secondaries():
client = utils.new_mongo_client(port=secondary.port,
read_preference=pymongo.ReadPreference.SECONDARY)
while True:
self.logger.info("Waiting for secondary on port %d to become available.",
secondary.port)
is_secondary = client.admin.command("isMaster")["secondary"]
if is_secondary:
break
time.sleep(0.1) # Wait a little bit before trying again.
self.logger.info("Secondary on port %d is now available.", secondary.port)
def teardown(self):
running_at_start = self.is_running()
success = True # Still a success even if nothing is running.
if not running_at_start:
self.logger.info("Replica set was expected to be running in teardown(), but wasn't.")
else:
self.logger.info("Stopping all members of the replica set...")
# Terminate the secondaries first to reduce noise in the logs.
for node in reversed(self.nodes):
success = node.teardown() and success
if running_at_start:
self.logger.info("Successfully stopped all members of the replica set.")
return success
def is_running(self):
return all(node.is_running() for node in self.nodes)
def get_primary(self):
# The primary is always the first element of the 'nodes' list because all other members of
# the replica set are configured with priority=0.
return self.nodes[0]
def get_secondaries(self):
return self.nodes[1:]
def _new_mongod(self, index, replset_name):
"""
Returns a standalone.MongoDFixture configured to be used as a
replica-set member of 'replset_name'.
"""
mongod_logger = self._get_logger_for_mongod(index)
mongod_options = self.mongod_options.copy()
mongod_options["replSet"] = replset_name
mongod_options["dbpath"] = os.path.join(self._dbpath_prefix, "node%d" % (index))
return standalone.MongoDFixture(mongod_logger,
self.job_num,
mongod_executable=self.mongod_executable,
mongod_options=mongod_options,
preserve_dbpath=self.preserve_dbpath)
def _get_logger_for_mongod(self, index):
"""
Returns a new logging.Logger instance for use as the primary or
secondary of a replica-set.
"""
if index == 0:
logger_name = "%s:primary" % (self.logger.name)
else:
suffix = str(index - 1) if self.num_nodes > 2 else ""
logger_name = "%s:secondary%s" % (self.logger.name, suffix)
return logging.loggers.new_logger(logger_name, parent=self.logger)
def get_internal_connection_string(self):
if self.replset_name is None:
raise ValueError("Must call setup() before calling get_internal_connection_string()")
conn_strs = [node.get_internal_connection_string() for node in self.nodes]
return self.replset_name + "/" + ",".join(conn_strs)
def get_driver_connection_url(self):
if self.replset_name is None:
raise ValueError("Must call setup() before calling get_driver_connection_url()")
if self.use_replica_set_connection_string:
# The mongo shell requires the database name when specifying a replica set connection
# string, so we hardcode "test" because that's the default database anyway.
conn_strs = [node.get_internal_connection_string() for node in self.nodes]
return "mongodb://" + ",".join(conn_strs) + "/test?replicaSet=" + self.replset_name
else:
# We return a direct connection to the expected pimary when only the first node is
# electable because we want the client to error out if a stepdown occurs.
return self.nodes[0].get_driver_connection_url()
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