YouCompleteMe/python/ycm/server/ycmd.py

#!/usr/bin/env python
#
# Copyright (C) 2013  Strahinja Val Markovic  <val@markovic.io>
#
# This file is part of YouCompleteMe.
#
# YouCompleteMe is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# YouCompleteMe is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.

from server_utils import SetUpPythonPath
SetUpPythonPath()

import sys
import logging
import json
import argparse
import waitress
import signal
from ycm import user_options_store
from ycm import extra_conf_store


def YcmCoreSanityCheck():
  if 'ycm_core' in sys.modules:
    raise RuntimeError( 'ycm_core already imported, ycmd has a bug!' )


# We need to manually call ServerShutdown for the signals that turn down ycmd
# because atexit won't handle them.
def SetUpSignalHandler():
  def SignalHandler():
    import handlers
    handlers.ServerShutdown()

  for sig in [ signal.SIGTERM,
               signal.SIGINT,
               signal.SIGHUP,
               signal.SIGQUIT ]:
    signal.signal( sig, SignalHandler )


def Main():
  parser = argparse.ArgumentParser()
  parser.add_argument( '--host', type = str, default = 'localhost',
                       help = 'server hostname')
  parser.add_argument( '--port', type = int, default = 6666,
                       help = 'server port')
  parser.add_argument( '--log', type = str, default = 'info',
                       help = 'log level, one of '
                              '[debug|info|warning|error|critical]' )
  parser.add_argument( '--options_file', type = str, default = '',
                       help = 'file with user options, in JSON format' )
  args = parser.parse_args()

  numeric_level = getattr( logging, args.log.upper(), None )
  if not isinstance( numeric_level, int ):
    raise ValueError( 'Invalid log level: %s' % args.log )

  # Has to be called before any call to logging.getLogger()
  logging.basicConfig( format = '%(asctime)s - %(levelname)s - %(message)s',
                       level = numeric_level )

  options = None
  if args.options_file:
    options = json.load( open( args.options_file, 'r' ) )
    user_options_store.SetAll( options )
    # This ensures that ycm_core is not loaded before extra conf
    # preload was run.
    YcmCoreSanityCheck()
    extra_conf_store.CallGlobalExtraConfYcmCorePreloadIfExists()

  # This can't be a top-level import because it transitively imports
  # ycm_core which we want to be imported ONLY after extra conf
  # preload has executed.
  import handlers
  handlers.UpdateUserOptions( options )
  SetUpSignalHandler()
  waitress.serve( handlers.app,
                  host = args.host,
                  port = args.port,
                  threads = 10 )


if __name__ == "__main__":
  Main()