# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""HTTP2 Test Server"""

import argparse
import logging
import sys
import twisted
import twisted.internet
import twisted.internet.endpoints
import twisted.internet.reactor

import http2_base_server
import test_goaway
import test_max_streams
import test_ping
import test_rst_after_data
import test_rst_after_header
import test_rst_during_data
import test_data_frame_padding

_TEST_CASE_MAPPING = {
  'rst_after_header': test_rst_after_header.TestcaseRstStreamAfterHeader,
  'rst_after_data': test_rst_after_data.TestcaseRstStreamAfterData,
  'rst_during_data': test_rst_during_data.TestcaseRstStreamDuringData,
  'goaway': test_goaway.TestcaseGoaway,
  'ping': test_ping.TestcasePing,
  'max_streams': test_max_streams.TestcaseSettingsMaxStreams,

  # Positive tests below:
  'data_frame_padding': test_data_frame_padding.TestDataFramePadding,
  'no_df_padding_sanity_test': test_data_frame_padding.TestDataFramePadding,
}

_exit_code = 0

class H2Factory(twisted.internet.protocol.Factory):
  def __init__(self, testcase):
    logging.info('Creating H2Factory for new connection (%s)', testcase)
    self._num_streams = 0
    self._testcase = testcase

  def buildProtocol(self, addr):
    self._num_streams += 1
    logging.info('New Connection: %d' % self._num_streams)
    if not _TEST_CASE_MAPPING.has_key(self._testcase):
      logging.error('Unknown test case: %s' % self._testcase)
      assert(0)
    else:
      t = _TEST_CASE_MAPPING[self._testcase]

    if self._testcase == 'goaway':
      return t(self._num_streams).get_base_server()
    elif self._testcase == 'no_df_padding_sanity_test':
      return t(use_padding=False).get_base_server()
    else:
      return t().get_base_server()

def parse_arguments():
  parser = argparse.ArgumentParser()
  parser.add_argument('--base_port', type=int, default=8080,
    help='base port to run the servers (default: 8080). One test server is '
    'started on each incrementing port, beginning with base_port, in the '
    'following order: data_frame_padding,goaway,max_streams,'
    'no_df_padding_sanity_test,ping,rst_after_data,rst_after_header,'
    'rst_during_data'
    )
  return parser.parse_args()

def listen(endpoint, test_case):
  deferred = endpoint.listen(H2Factory(test_case))
  def listen_error(reason):
    # If listening fails, we stop the reactor and exit the program
    # with exit code 1.
    global _exit_code
    _exit_code = 1
    logging.error('Listening failed: %s' % reason.value)
    twisted.internet.reactor.stop()
  deferred.addErrback(listen_error)

def start_test_servers(base_port):
  """ Start one server per test case on incrementing port numbers
  beginning with base_port """
  index = 0
  for test_case in sorted(_TEST_CASE_MAPPING.keys()):
    portnum = base_port + index
    logging.warning('serving on port %d : %s'%(portnum, test_case))
    endpoint = twisted.internet.endpoints.TCP4ServerEndpoint(
      twisted.internet.reactor, portnum, backlog=128)
    # Wait until the reactor is running before calling endpoint.listen().
    twisted.internet.reactor.callWhenRunning(listen, endpoint, test_case)

    index += 1

if __name__ == '__main__':
  logging.basicConfig(
    format='%(levelname) -10s %(asctime)s %(module)s:%(lineno)s | %(message)s',
    level=logging.INFO)
  args = parse_arguments()
  start_test_servers(args.base_port)
  twisted.internet.reactor.run()
  sys.exit(_exit_code)