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# Tests statestore with non-default startup options

import logging
import os
import pytest
import re
import sys
import uuid
import socket

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite
from tests.common.impala_test_suite import ImpalaTestSuite

from Types.ttypes import TNetworkAddress
from thrift.protocol import TBinaryProtocol
from thrift.transport import TSocket, TTransport

import StatestoreService.StatestoreSubscriber as Subscriber
import StatestoreService.StatestoreService as Statestore
from ErrorCodes.ttypes import TErrorCode

LOG = logging.getLogger('custom_statestore_test')
STATESTORE_SERVICE_PORT = 24000

# A simple wrapper class to launch a cluster where we can tune various
# startup parameters of the statestored to test correct boundary-value
# behavior.
class TestCustomStatestore(CustomClusterTestSuite):
  # Grab a port the statestore subscribers will use to connect.
  # Note that all subscribers we create below use this port to connect,
  # with different subscriber IDs.
  handle = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  handle.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  handle.bind(('localhost', 0))
  _, port = handle.getsockname()

  @classmethod
  def get_workload(self):
    return 'functional-query'

  def __register_subscriber(self):
    subscriber_id = "python-test-client-%s" % uuid.uuid4()
    topics = []
    request = Subscriber.TRegisterSubscriberRequest(topic_registrations=topics,
      subscriber_location=TNetworkAddress("localhost", self.port),
      subscriber_id=subscriber_id)
    client_transport = \
      TTransport.TBufferedTransport(TSocket.TSocket('localhost', STATESTORE_SERVICE_PORT))
    protocol = TBinaryProtocol.TBinaryProtocol(client_transport)
    client = Statestore.Client(protocol)
    client_transport.open()
    return client.RegisterSubscriber(request)

  @CustomClusterTestSuite.with_args(statestored_args="-statestore_max_subscribers=3")
  def test_statestore_max_subscribers(self):
    """Test that the statestored correctly handles the condition where the number
    of subscribers exceeds FLAGS_statestore_max_subscribers
    (see be/src/statestore/statestore.cc). The expected behavior is for the
    statestored to reject the subscription request once the threshold is
    exceeded."""
    # With a statestore_max_subscribers of 3, we should hit the registration error
    # pretty quick.
    for x in xrange(20):
      response = self.__register_subscriber()
      if response.status.status_code == TErrorCode.OK:
        self.registration_id = response.registration_id
        LOG.log(logging.INFO, "Registration id %s, x=%d" % (response.registration_id, x))
      else:
        assert 'Maximum subscriber limit reached:' in ''.join(response.status.error_msgs)
        return

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      impalad_args="--statestore_subscriber_use_resolved_address=true",
      catalogd_args="--statestore_subscriber_use_resolved_address=true")
  def test_subscriber_with_resolved_address(self, vector):
    # Ensure cluster has started up by running a query.
    result = self.execute_query("select count(*) from functional_parquet.alltypes")
    assert result.success, str(result)

    self.assert_impalad_log_contains("INFO",
        "Registering with statestore with resolved address")
    self.assert_catalogd_log_contains("INFO",
        "Registering with statestore with resolved address")