298 lines
10 KiB
Python
298 lines
10 KiB
Python
# Copyright (C) 2013 Google Inc.
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#
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# This file is part of YouCompleteMe.
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#
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# YouCompleteMe is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# YouCompleteMe is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with YouCompleteMe. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import unicode_literals
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from __future__ import print_function
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from __future__ import division
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from __future__ import absolute_import
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from future import standard_library
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standard_library.install_aliases()
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from builtins import * # noqa
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import contextlib
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import logging
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import requests
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import urllib.parse
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import json
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from future.utils import native
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from base64 import b64decode, b64encode
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from retries import retries
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from requests_futures.sessions import FuturesSession
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from ycm.unsafe_thread_pool_executor import UnsafeThreadPoolExecutor
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from ycm import vimsupport
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from ycmd.utils import ToBytes
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from ycmd.hmac_utils import CreateRequestHmac, CreateHmac, SecureBytesEqual
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from ycmd.responses import ServerError, UnknownExtraConf
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_HEADERS = {'content-type': 'application/json'}
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_EXECUTOR = UnsafeThreadPoolExecutor( max_workers = 30 )
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# Setting this to None seems to screw up the Requests/urllib3 libs.
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_DEFAULT_TIMEOUT_SEC = 30
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_HMAC_HEADER = 'x-ycm-hmac'
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_logger = logging.getLogger( __name__ )
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class BaseRequest( object ):
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def __init__( self ):
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pass
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def Start( self ):
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pass
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def Done( self ):
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return True
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def Response( self ):
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return {}
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# This method blocks
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# |timeout| is num seconds to tolerate no response from server before giving
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# up; see Requests docs for details (we just pass the param along).
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@staticmethod
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def GetDataFromHandler( handler, timeout = _DEFAULT_TIMEOUT_SEC ):
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return JsonFromFuture( BaseRequest._TalkToHandlerAsync( '',
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handler,
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'GET',
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timeout ) )
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# This is the blocking version of the method. See below for async.
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# |timeout| is num seconds to tolerate no response from server before giving
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# up; see Requests docs for details (we just pass the param along).
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@staticmethod
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def PostDataToHandler( data, handler, timeout = _DEFAULT_TIMEOUT_SEC ):
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return JsonFromFuture( BaseRequest.PostDataToHandlerAsync( data,
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handler,
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timeout ) )
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# This returns a future! Use JsonFromFuture to get the value.
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# |timeout| is num seconds to tolerate no response from server before giving
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# up; see Requests docs for details (we just pass the param along).
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@staticmethod
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def PostDataToHandlerAsync( data, handler, timeout = _DEFAULT_TIMEOUT_SEC ):
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return BaseRequest._TalkToHandlerAsync( data, handler, 'POST', timeout )
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# This returns a future! Use JsonFromFuture to get the value.
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# |method| is either 'POST' or 'GET'.
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# |timeout| is num seconds to tolerate no response from server before giving
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# up; see Requests docs for details (we just pass the param along).
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@staticmethod
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def _TalkToHandlerAsync( data,
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handler,
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method,
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timeout = _DEFAULT_TIMEOUT_SEC ):
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def SendRequest( data, handler, method, timeout ):
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request_uri = _BuildUri( handler )
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if method == 'POST':
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sent_data = _ToUtf8Json( data )
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return BaseRequest.session.post(
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request_uri,
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data = sent_data,
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headers = BaseRequest._ExtraHeaders( method,
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request_uri,
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sent_data ),
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timeout = timeout )
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if method == 'GET':
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return BaseRequest.session.get(
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request_uri,
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headers = BaseRequest._ExtraHeaders( method, request_uri ),
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timeout = timeout )
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@retries( 5, delay = 0.5, backoff = 1.5 )
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def DelayedSendRequest( data, handler, method ):
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request_uri = _BuildUri( handler )
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if method == 'POST':
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sent_data = _ToUtf8Json( data )
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return requests.post(
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request_uri,
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data = sent_data,
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headers = BaseRequest._ExtraHeaders( method,
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request_uri,
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sent_data ) )
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if method == 'GET':
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return requests.get(
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request_uri,
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headers = BaseRequest._ExtraHeaders( method, request_uri ) )
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if not _CheckServerIsHealthyWithCache():
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return _EXECUTOR.submit( DelayedSendRequest, data, handler, method )
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return SendRequest( data, handler, method, timeout )
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@staticmethod
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def _ExtraHeaders( method, request_uri, request_body = None ):
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if not request_body:
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request_body = bytes( b'' )
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headers = dict( _HEADERS )
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headers[ _HMAC_HEADER ] = b64encode(
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CreateRequestHmac( ToBytes( method ),
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ToBytes( urllib.parse.urlparse( request_uri ).path ),
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request_body,
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BaseRequest.hmac_secret ) )
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return headers
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session = FuturesSession( executor = _EXECUTOR )
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server_location = ''
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hmac_secret = ''
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def BuildRequestData( filepath = None ):
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"""Build request for the current buffer or the buffer corresponding to
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|filepath| if specified."""
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current_filepath = vimsupport.GetCurrentBufferFilepath()
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if filepath and current_filepath != filepath:
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# Cursor position is irrelevant when filepath is not the current buffer.
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return {
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'filepath': filepath,
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'line_num': 1,
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'column_num': 1,
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'file_data': vimsupport.GetUnsavedAndSpecifiedBufferData( filepath )
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}
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line, column = vimsupport.CurrentLineAndColumn()
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return {
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'filepath': current_filepath,
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'line_num': line + 1,
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'column_num': column + 1,
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'file_data': vimsupport.GetUnsavedAndSpecifiedBufferData( current_filepath )
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}
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def JsonFromFuture( future ):
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response = future.result()
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_ValidateResponseObject( response )
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if response.status_code == requests.codes.server_error:
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raise MakeServerException( response.json() )
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# We let Requests handle the other status types, we only handle the 500
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# error code.
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response.raise_for_status()
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if response.text:
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return response.json()
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return None
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@contextlib.contextmanager
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def HandleServerException( display = True, truncate = False ):
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"""Catch any exception raised through server communication. If it is raised
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because of a unknown .ycm_extra_conf.py file, load the file or ignore it after
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asking the user. Otherwise, log the exception and display its message to the
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user on the Vim status line. Unset the |display| parameter to hide the message
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from the user. Set the |truncate| parameter to avoid hit-enter prompts from
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this message.
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The GetDataFromHandler, PostDataToHandler, and JsonFromFuture functions should
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always be wrapped by this function to avoid Python exceptions bubbling up to
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the user.
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Example usage:
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with HandleServerException():
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response = BaseRequest.PostDataToHandler( ... )
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"""
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try:
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yield
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except UnknownExtraConf as e:
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if vimsupport.Confirm( str( e ) ):
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_LoadExtraConfFile( e.extra_conf_file )
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else:
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_IgnoreExtraConfFile( e.extra_conf_file )
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except Exception as e:
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_logger.exception( 'Error while handling server response' )
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if display:
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DisplayServerException( e, truncate )
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def _LoadExtraConfFile( filepath ):
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BaseRequest.PostDataToHandler( { 'filepath': filepath },
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'load_extra_conf_file' )
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def _IgnoreExtraConfFile( filepath ):
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BaseRequest.PostDataToHandler( { 'filepath': filepath },
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'ignore_extra_conf_file' )
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def DisplayServerException( exception, truncate = False ):
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serialized_exception = str( exception )
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# We ignore the exception about the file already being parsed since it comes
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# up often and isn't something that's actionable by the user.
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if 'already being parsed' in serialized_exception:
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return
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vimsupport.PostVimMessage( serialized_exception, truncate = truncate )
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def _ToUtf8Json( data ):
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return ToBytes( json.dumps( data ) if data else None )
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def _ValidateResponseObject( response ):
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our_hmac = CreateHmac( response.content, BaseRequest.hmac_secret )
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their_hmac = ToBytes( b64decode( response.headers[ _HMAC_HEADER ] ) )
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if not SecureBytesEqual( our_hmac, their_hmac ):
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raise RuntimeError( 'Received invalid HMAC for response!' )
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return True
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def _BuildUri( handler ):
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return native( ToBytes( urllib.parse.urljoin( BaseRequest.server_location,
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handler ) ) )
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SERVER_HEALTHY = False
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def _CheckServerIsHealthyWithCache():
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global SERVER_HEALTHY
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def _ServerIsHealthy():
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request_uri = _BuildUri( 'healthy' )
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response = requests.get( request_uri,
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headers = BaseRequest._ExtraHeaders(
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'GET', request_uri, bytes( b'' ) ) )
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_ValidateResponseObject( response )
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response.raise_for_status()
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return response.json()
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if SERVER_HEALTHY:
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return True
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try:
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SERVER_HEALTHY = _ServerIsHealthy()
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return SERVER_HEALTHY
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except:
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return False
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def MakeServerException( data ):
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if data[ 'exception' ][ 'TYPE' ] == UnknownExtraConf.__name__:
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return UnknownExtraConf( data[ 'exception' ][ 'extra_conf_file' ] )
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return ServerError( '{0}: {1}'.format( data[ 'exception' ][ 'TYPE' ],
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data[ 'message' ] ) )
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