Mercurial > hg
view tests/badserverext.py @ 39855:62a532045e71
lfs: access revlog directly
LFS is monkeypatching filelog.filelog and is then accessing
various filelog attributes in the monkeypatched function. This is all
fine.
But some of the attributes being accessed by LFS are revlog centric
and shouldn't be exposed on the file storage interface.
This commit changes the monkeypatched functions to access proxied
attributes on self._revlog instead of self.
This should be safe to do because non-revlog repositories should not
be using filelog instances: instead they should have a separate class
to represent file storage. So it is reasonable for LFS to assume the
_revlog attribute exists and points to a revlog.
Differential Revision: https://phab.mercurial-scm.org/D4714
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 20 Sep 2018 17:47:34 -0700 |
parents | cbfab495dbcf |
children | ba7298160357 |
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# badserverext.py - Extension making servers behave badly # # Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. # no-check-code """Extension to make servers behave badly. This extension is useful for testing Mercurial behavior when various network events occur. Various config options in the [badserver] section influence behavior: closebeforeaccept If true, close() the server socket when a new connection arrives before accept() is called. The server will then exit. closeafteraccept If true, the server will close() the client socket immediately after accept(). closeafterrecvbytes If defined, close the client socket after receiving this many bytes. closeaftersendbytes If defined, close the client socket after sending this many bytes. """ from __future__ import absolute_import import socket from mercurial import( registrar, ) from mercurial.hgweb import ( server, ) configtable = {} configitem = registrar.configitem(configtable) configitem(b'badserver', b'closeafteraccept', default=False, ) configitem(b'badserver', b'closeafterrecvbytes', default='0', ) configitem(b'badserver', b'closeaftersendbytes', default='0', ) configitem(b'badserver', b'closebeforeaccept', default=False, ) # We can't adjust __class__ on a socket instance. So we define a proxy type. class socketproxy(object): __slots__ = ( '_orig', '_logfp', '_closeafterrecvbytes', '_closeaftersendbytes', ) def __init__(self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0): object.__setattr__(self, '_orig', obj) object.__setattr__(self, '_logfp', logfp) object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) def __getattribute__(self, name): if name in ('makefile',): return object.__getattribute__(self, name) return getattr(object.__getattribute__(self, '_orig'), name) def __delattr__(self, name): delattr(object.__getattribute__(self, '_orig'), name) def __setattr__(self, name, value): setattr(object.__getattribute__(self, '_orig'), name, value) def makefile(self, mode, bufsize): f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) logfp = object.__getattribute__(self, '_logfp') closeafterrecvbytes = object.__getattribute__(self, '_closeafterrecvbytes') closeaftersendbytes = object.__getattribute__(self, '_closeaftersendbytes') return fileobjectproxy(f, logfp, closeafterrecvbytes=closeafterrecvbytes, closeaftersendbytes=closeaftersendbytes) # We can't adjust __class__ on socket._fileobject, so define a proxy. class fileobjectproxy(object): __slots__ = ( '_orig', '_logfp', '_closeafterrecvbytes', '_closeaftersendbytes', ) def __init__(self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0): object.__setattr__(self, '_orig', obj) object.__setattr__(self, '_logfp', logfp) object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) def __getattribute__(self, name): if name in ('read', 'readline', 'write', '_writelog'): return object.__getattribute__(self, name) return getattr(object.__getattribute__(self, '_orig'), name) def __delattr__(self, name): delattr(object.__getattribute__(self, '_orig'), name) def __setattr__(self, name, value): setattr(object.__getattribute__(self, '_orig'), name, value) def _writelog(self, msg): msg = msg.replace('\r', '\\r').replace('\n', '\\n') object.__getattribute__(self, '_logfp').write(msg) object.__getattribute__(self, '_logfp').write('\n') object.__getattribute__(self, '_logfp').flush() def read(self, size=-1): remaining = object.__getattribute__(self, '_closeafterrecvbytes') # No read limit. Call original function. if not remaining: result = object.__getattribute__(self, '_orig').read(size) self._writelog('read(%d) -> (%d) (%s) %s' % (size, len(result), result)) return result origsize = size if size < 0: size = remaining else: size = min(remaining, size) result = object.__getattribute__(self, '_orig').read(size) remaining -= len(result) self._writelog('read(%d from %d) -> (%d) %s' % ( size, origsize, len(result), result)) object.__setattr__(self, '_closeafterrecvbytes', remaining) if remaining <= 0: self._writelog('read limit reached, closing socket') self._sock.close() # This is the easiest way to abort the current request. raise Exception('connection closed after receiving N bytes') return result def readline(self, size=-1): remaining = object.__getattribute__(self, '_closeafterrecvbytes') # No read limit. Call original function. if not remaining: result = object.__getattribute__(self, '_orig').readline(size) self._writelog('readline(%d) -> (%d) %s' % ( size, len(result), result)) return result origsize = size if size < 0: size = remaining else: size = min(remaining, size) result = object.__getattribute__(self, '_orig').readline(size) remaining -= len(result) self._writelog('readline(%d from %d) -> (%d) %s' % ( size, origsize, len(result), result)) object.__setattr__(self, '_closeafterrecvbytes', remaining) if remaining <= 0: self._writelog('read limit reached; closing socket') self._sock.close() # This is the easiest way to abort the current request. raise Exception('connection closed after receiving N bytes') return result def write(self, data): remaining = object.__getattribute__(self, '_closeaftersendbytes') # No byte limit on this operation. Call original function. if not remaining: self._writelog('write(%d) -> %s' % (len(data), data)) result = object.__getattribute__(self, '_orig').write(data) return result if len(data) > remaining: newdata = data[0:remaining] else: newdata = data remaining -= len(newdata) self._writelog('write(%d from %d) -> (%d) %s' % ( len(newdata), len(data), remaining, newdata)) result = object.__getattribute__(self, '_orig').write(newdata) object.__setattr__(self, '_closeaftersendbytes', remaining) if remaining <= 0: self._writelog('write limit reached; closing socket') self._sock.close() raise Exception('connection closed after sending N bytes') return result def extsetup(ui): # Change the base HTTP server class so various events can be performed. # See SocketServer.BaseServer for how the specially named methods work. class badserver(server.MercurialHTTPServer): def __init__(self, ui, *args, **kwargs): self._ui = ui super(badserver, self).__init__(ui, *args, **kwargs) recvbytes = self._ui.config(b'badserver', b'closeafterrecvbytes') recvbytes = recvbytes.split(',') self.closeafterrecvbytes = [int(v) for v in recvbytes if v] sendbytes = self._ui.config(b'badserver', b'closeaftersendbytes') sendbytes = sendbytes.split(',') self.closeaftersendbytes = [int(v) for v in sendbytes if v] # Need to inherit object so super() works. class badrequesthandler(self.RequestHandlerClass, object): def send_header(self, name, value): # Make headers deterministic to facilitate testing. if name.lower() == 'date': value = 'Fri, 14 Apr 2017 00:00:00 GMT' elif name.lower() == 'server': value = 'badhttpserver' return super(badrequesthandler, self).send_header(name, value) self.RequestHandlerClass = badrequesthandler # Called to accept() a pending socket. def get_request(self): if self._ui.configbool(b'badserver', b'closebeforeaccept'): self.socket.close() # Tells the server to stop processing more requests. self.__shutdown_request = True # Simulate failure to stop processing this request. raise socket.error('close before accept') if self._ui.configbool('badserver', 'closeafteraccept'): request, client_address = super(badserver, self).get_request() request.close() raise socket.error('close after accept') return super(badserver, self).get_request() # Does heavy lifting of processing a request. Invokes # self.finish_request() which calls self.RequestHandlerClass() which # is a hgweb.server._httprequesthandler. def process_request(self, socket, address): # Wrap socket in a proxy if we need to count bytes. if self.closeafterrecvbytes: closeafterrecvbytes = self.closeafterrecvbytes.pop(0) else: closeafterrecvbytes = 0 if self.closeaftersendbytes: closeaftersendbytes = self.closeaftersendbytes.pop(0) else: closeaftersendbytes = 0 if closeafterrecvbytes or closeaftersendbytes: socket = socketproxy(socket, self.errorlog, closeafterrecvbytes=closeafterrecvbytes, closeaftersendbytes=closeaftersendbytes) return super(badserver, self).process_request(socket, address) server.MercurialHTTPServer = badserver