author | Kevin Bullock <kbullock@ringworld.org> |
Sat, 05 May 2018 18:03:01 -0500 | |
branch | stable |
changeset 37835 | 1f65d7d46545 |
parent 37498 | aacfca6f9767 |
child 39428 | cbfab495dbcf |
permissions | -rw-r--r-- |
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# badserverext.py - Extension making servers behave badly |
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# |
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# Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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# no-check-code |
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"""Extension to make servers behave badly. |
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This extension is useful for testing Mercurial behavior when various network |
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events occur. |
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Various config options in the [badserver] section influence behavior: |
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closebeforeaccept |
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If true, close() the server socket when a new connection arrives before |
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accept() is called. The server will then exit. |
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closeafteraccept |
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If true, the server will close() the client socket immediately after |
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accept(). |
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closeafterrecvbytes |
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If defined, close the client socket after receiving this many bytes. |
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closeaftersendbytes |
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If defined, close the client socket after sending this many bytes. |
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""" |
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from __future__ import absolute_import |
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import socket |
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from mercurial import( |
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registrar, |
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from mercurial.hgweb import ( |
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server, |
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) |
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configtable = {} |
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configitem = registrar.configitem(configtable) |
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configitem(b'badserver', b'closeafteraccept', |
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default=False, |
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configitem(b'badserver', b'closeafterrecvbytes', |
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default='0', |
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configitem(b'badserver', b'closeaftersendbytes', |
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default='0', |
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configitem(b'badserver', b'closebeforeaccept', |
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default=False, |
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# We can't adjust __class__ on a socket instance. So we define a proxy type. |
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class socketproxy(object): |
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__slots__ = ( |
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'_orig', |
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'_logfp', |
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'_closeafterrecvbytes', |
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'_closeaftersendbytes', |
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) |
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def __init__(self, obj, logfp, closeafterrecvbytes=0, |
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closeaftersendbytes=0): |
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object.__setattr__(self, '_orig', obj) |
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object.__setattr__(self, '_logfp', logfp) |
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object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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def __getattribute__(self, name): |
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if name in ('makefile',): |
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return object.__getattribute__(self, name) |
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return getattr(object.__getattribute__(self, '_orig'), name) |
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def __delattr__(self, name): |
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delattr(object.__getattribute__(self, '_orig'), name) |
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def __setattr__(self, name, value): |
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setattr(object.__getattribute__(self, '_orig'), name, value) |
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def makefile(self, mode, bufsize): |
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f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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logfp = object.__getattribute__(self, '_logfp') |
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closeafterrecvbytes = object.__getattribute__(self, |
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'_closeafterrecvbytes') |
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closeaftersendbytes = object.__getattribute__(self, |
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return fileobjectproxy(f, logfp, |
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closeafterrecvbytes=closeafterrecvbytes, |
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closeaftersendbytes=closeaftersendbytes) |
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# We can't adjust __class__ on socket._fileobject, so define a proxy. |
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class fileobjectproxy(object): |
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__slots__ = ( |
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'_orig', |
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'_logfp', |
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'_closeafterrecvbytes', |
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'_closeaftersendbytes', |
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) |
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def __init__(self, obj, logfp, closeafterrecvbytes=0, |
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closeaftersendbytes=0): |
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object.__setattr__(self, '_orig', obj) |
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object.__setattr__(self, '_logfp', logfp) |
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object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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def __getattribute__(self, name): |
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if name in ('read', 'readline', 'write', '_writelog'): |
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return object.__getattribute__(self, name) |
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|
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return getattr(object.__getattribute__(self, '_orig'), name) |
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def __delattr__(self, name): |
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delattr(object.__getattribute__(self, '_orig'), name) |
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def __setattr__(self, name, value): |
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setattr(object.__getattribute__(self, '_orig'), name, value) |
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def _writelog(self, msg): |
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msg = msg.replace('\r', '\\r').replace('\n', '\\n') |
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|
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object.__getattribute__(self, '_logfp').write(msg) |
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object.__getattribute__(self, '_logfp').write('\n') |
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object.__getattribute__(self, '_logfp').flush() |
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def read(self, size=-1): |
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remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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# No read limit. Call original function. |
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if not remaining: |
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result = object.__getattribute__(self, '_orig').read(size) |
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self._writelog('read(%d) -> (%d) (%s) %s' % (size, |
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len(result), |
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result)) |
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return result |
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|
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origsize = size |
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|
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if size < 0: |
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size = remaining |
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else: |
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size = min(remaining, size) |
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|
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result = object.__getattribute__(self, '_orig').read(size) |
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remaining -= len(result) |
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|
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self._writelog('read(%d from %d) -> (%d) %s' % ( |
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size, origsize, len(result), result)) |
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|
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object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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|
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if remaining <= 0: |
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self._writelog('read limit reached, closing socket') |
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self._sock.close() |
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# This is the easiest way to abort the current request. |
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raise Exception('connection closed after receiving N bytes') |
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167 |
|
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return result |
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|
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def readline(self, size=-1): |
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remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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|
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# No read limit. Call original function. |
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174 |
if not remaining: |
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175 |
result = object.__getattribute__(self, '_orig').readline(size) |
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self._writelog('readline(%d) -> (%d) %s' % ( |
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size, len(result), result)) |
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178 |
return result |
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|
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origsize = size |
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181 |
|
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182 |
if size < 0: |
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size = remaining |
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184 |
else: |
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185 |
size = min(remaining, size) |
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|
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result = object.__getattribute__(self, '_orig').readline(size) |
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188 |
remaining -= len(result) |
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189 |
|
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190 |
self._writelog('readline(%d from %d) -> (%d) %s' % ( |
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191 |
size, origsize, len(result), result)) |
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192 |
|
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193 |
object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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|
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195 |
if remaining <= 0: |
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196 |
self._writelog('read limit reached; closing socket') |
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197 |
self._sock.close() |
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198 |
# This is the easiest way to abort the current request. |
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199 |
raise Exception('connection closed after receiving N bytes') |
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200 |
|
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201 |
return result |
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202 |
|
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203 |
def write(self, data): |
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204 |
remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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205 |
|
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206 |
# No byte limit on this operation. Call original function. |
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207 |
if not remaining: |
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208 |
self._writelog('write(%d) -> %s' % (len(data), data)) |
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209 |
result = object.__getattribute__(self, '_orig').write(data) |
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210 |
return result |
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211 |
|
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212 |
if len(data) > remaining: |
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213 |
newdata = data[0:remaining] |
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214 |
else: |
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215 |
newdata = data |
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216 |
|
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217 |
remaining -= len(newdata) |
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218 |
|
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219 |
self._writelog('write(%d from %d) -> (%d) %s' % ( |
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len(newdata), len(data), remaining, newdata)) |
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221 |
|
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222 |
result = object.__getattribute__(self, '_orig').write(newdata) |
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223 |
|
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224 |
object.__setattr__(self, '_closeaftersendbytes', remaining) |
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|
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226 |
if remaining <= 0: |
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227 |
self._writelog('write limit reached; closing socket') |
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228 |
self._sock.close() |
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229 |
raise Exception('connection closed after sending N bytes') |
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230 |
|
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231 |
return result |
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232 |
|
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233 |
def extsetup(ui): |
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234 |
# Change the base HTTP server class so various events can be performed. |
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235 |
# See SocketServer.BaseServer for how the specially named methods work. |
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236 |
class badserver(server.MercurialHTTPServer): |
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def __init__(self, ui, *args, **kwargs): |
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self._ui = ui |
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super(badserver, self).__init__(ui, *args, **kwargs) |
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recvbytes = self._ui.config('badserver', 'closeafterrecvbytes') |
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recvbytes = recvbytes.split(',') |
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self.closeafterrecvbytes = [int(v) for v in recvbytes if v] |
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sendbytes = self._ui.config('badserver', 'closeaftersendbytes') |
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sendbytes = sendbytes.split(',') |
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self.closeaftersendbytes = [int(v) for v in sendbytes if v] |
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# Need to inherit object so super() works. |
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class badrequesthandler(self.RequestHandlerClass, object): |
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def send_header(self, name, value): |
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# Make headers deterministic to facilitate testing. |
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if name.lower() == 'date': |
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value = 'Fri, 14 Apr 2017 00:00:00 GMT' |
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elif name.lower() == 'server': |
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value = 'badhttpserver' |
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return super(badrequesthandler, self).send_header(name, |
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value) |
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self.RequestHandlerClass = badrequesthandler |
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# Called to accept() a pending socket. |
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def get_request(self): |
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if self._ui.configbool('badserver', 'closebeforeaccept'): |
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self.socket.close() |
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# Tells the server to stop processing more requests. |
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self.__shutdown_request = True |
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# Simulate failure to stop processing this request. |
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raise socket.error('close before accept') |
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if self._ui.configbool('badserver', 'closeafteraccept'): |
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request, client_address = super(badserver, self).get_request() |
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request.close() |
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raise socket.error('close after accept') |
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return super(badserver, self).get_request() |
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# Does heavy lifting of processing a request. Invokes |
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# self.finish_request() which calls self.RequestHandlerClass() which |
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# is a hgweb.server._httprequesthandler. |
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def process_request(self, socket, address): |
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# Wrap socket in a proxy if we need to count bytes. |
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if self.closeafterrecvbytes: |
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closeafterrecvbytes = self.closeafterrecvbytes.pop(0) |
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else: |
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closeafterrecvbytes = 0 |
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if self.closeaftersendbytes: |
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closeaftersendbytes = self.closeaftersendbytes.pop(0) |
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else: |
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closeaftersendbytes = 0 |
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if closeafterrecvbytes or closeaftersendbytes: |
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socket = socketproxy(socket, self.errorlog, |
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closeafterrecvbytes=closeafterrecvbytes, |
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closeaftersendbytes=closeaftersendbytes) |
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return super(badserver, self).process_request(socket, address) |
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server.MercurialHTTPServer = badserver |