Use shutdown request to stop server

Use shutdown request to stop ycmd server in a portable way.

python/ycm/client/shutdown_request.py

@@ -0,0 +1,54 @@
+# Copyright (C) 2016 YouCompleteMe contributors
+#
+# 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 __future__ import unicode_literals
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+from future import standard_library
+standard_library.install_aliases()
+from builtins import *  # noqa
+
+from requests.exceptions import ReadTimeout
+
+from ycm.client.base_request import BaseRequest
+
+TIMEOUT_SECONDS = 0.1
+
+
+class ShutdownRequest( BaseRequest ):
+  def __init__( self ):
+    super( BaseRequest, self ).__init__()
+
+
+  def Start( self ):
+    try:
+      self.PostDataToHandler( {},
+                              'shutdown',
+                              TIMEOUT_SECONDS )
+    except ReadTimeout:
+      pass
+
+
+  def Response( self ):
+    return self._response
+
+
+def SendShutdownRequest():
+  request = ShutdownRequest()
+  # This is a blocking call.
+  request.Start()

python/ycm/youcompleteme.py

@@ -49,6 +49,7 @@ from ycm.client.completion_request import ( CompletionRequest,
 from ycm.client.omni_completion_request import OmniCompletionRequest
 from ycm.client.event_notification import ( SendEventNotificationAsync,
                                             EventNotification )
+from ycm.client.shutdown_request import SendShutdownRequest
 
 try:
   from UltiSnips import UltiSnips_Manager
@@ -107,6 +108,7 @@ DIAGNOSTIC_UI_FILETYPES = set( [ 'cpp', 'cs', 'c', 'objc', 'objcpp' ] )
 
 class YouCompleteMe( object ):
   def __init__( self, user_options ):
+    self._available_completers = {}
     self._user_options = user_options
     self._user_notified_about_crash = False
     self._diag_interface = DiagnosticInterface( user_options )
@@ -127,6 +129,7 @@ class YouCompleteMe( object ):
 
   def _SetupServer( self ):
     self._available_completers = {}
+    self._user_notified_about_crash = False
     server_port = utils.GetUnusedLocalhostPort()
     # The temp options file is deleted by ycmd during startup
     with NamedTemporaryFile( delete = False, mode = 'w+' ) as options_file:
@@ -206,16 +209,15 @@ class YouCompleteMe( object ):
     return self._server_popen.pid
 
 
-  def _ServerCleanup( self ):
+  def _ShutdownServer( self ):
     if self.IsServerAlive():
-      self._server_popen.terminate()
+      SendShutdownRequest()
 
 
   def RestartServer( self ):
     self._CloseLogs()
     vimsupport.PostVimMessage( 'Restarting ycmd server...' )
-    self._user_notified_about_crash = False
-    self._ServerCleanup()
+    self._ShutdownServer()
     self._SetupServer()
 
 
@@ -332,7 +334,7 @@ class YouCompleteMe( object ):
 
 
   def OnVimLeave( self ):
-    self._ServerCleanup()
+    self._ShutdownServer()
 
 
   def OnCurrentIdentifierFinished( self ):