Глупости мы делаем, когда спешим или думаем о другом. Когда неопытный кодер обнаруживает в "продакшене" ошибку, то надо сначала хладнокровно следовать правилу: НЕ ДУМАЙ, а тупо проверь, подключено ли питание к твоему компьютеру.
Я, естественно, забыл про это правило. И многому научился, но баланс между обучением и выполнением плана надо менять в сторону последнего.
Вот копипаст фрагментов реестра W8, в котоых я искал настройки прокси¶
ProxyServer (regedit)¶
In []:
HKEY_USERS\S-1-5-21-3853063105-3212101752-667732613-1002\Software\Microsoft\Windows\CurrentVersion\Internet Settings
ProxyServer http=127.0.0.1:8118;https=127.0.0.1:8118;ftp=127.0.0.1:8118
In []:
HKEY_USERS\S-1-5-21-3853063105-3212101752-667732613-1002\Software\RealNetworks\RealJukebox\Search Engines\tcdinfo
Искал я в несколько заходов с разными ключевымис ловами, так что некоторый фрагменты могут повторяться
In []:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\iphlpsvc\Parameters\ProxyMgr\
{098C05E6-BB0E-4D9C-8A01-77727D832E0C}
StaticProxy http=127.0.0.1:8118;https=127.0.0.1:8118
In []:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NlaSvc\Parameters\Internet\ManualProxies
1http=127.0.0.1:8118;https=127.0.0.1:8118;ftp=127.0.0.1:8118
In []:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iphlpsvc\Parameters\ProxyMgr\{098C05E6-BB0E-4D9C-8A01-77727D832E0C}
А вот так я никак не мог взять в толк, константа в реестре не прописывается... пока не прочитал о переменных окружения CMD.exe¶
In []:
C:\Users\kiss\Anaconda>set http_proxy=127.0.0.1:8118
C:\Users\kiss\Anaconda>set h
HOMEDRIVE=C:
HOMEPATH=\Users\kiss
http_proxy=127.0.0.1:8118
Когда я "случайно" запустил scrapy через proxy, то немного успокоился¶
In []:
ipdb> response.request.
response.request.body response.request.dont_filter response.request.meta response.request.url
response.request.callback response.request.encoding response.request.method
response.request.cookies response.request.errback response.request.priority
response.request.copy response.request.headers response.request.replace
ipdb> response.request.meta
{'download_timeout': 180, 'download_latency': 0.4649999141693115, 'proxy': 'http://127.0.0.1:8118', 'download_slot': 'top.mail.ru'}
ipdb> exit
Но оказалось, что все "три варианта" подключения прокси-серверов отлиаются от моих прежних представлений..., но об этом потом, а далее попытаемся увековичить фрагменты процесса моих поисков.
Не надо забывать, что settings есть еще и в scrapy.conf¶
In [6]:
from scrapy.conf import settings
In [7]:
dir(settings)
Out[7]:
In [11]:
help(settings.values)
Вот пример "дурацкой ошибки" с "неработающим кодом"¶
Начнем с конца, т.е. с решения проблемы. Все дело оказалось в элементарной ошибке (невнимательность), вместо того, чтобы в файле settings.py определить константу:
In []:
HTTP_PROXY = 'http://127.0.0.1:8118'
Я задал ее вот так:
In []:
HTTP_PROXY = '127.0.0.1:8118'
Обнаружил я эту ошибку на следующий день, после того, как (в очередной раз) залез в дебаггер и "обратил внимание" на строчку
In []:
'proxy': '127.0.0.1:8118'
In []:
Вот в этом выводе консоли дебаггера:
In []:
> c:\users\kiss\skydrive\docs\mailru\mail_csv_1\csvmailspider\middleware\privoxy_tor_simplest.py(15)process_request()
13 if HTTP_PROXY !='':
14 request.meta['proxy'] = HTTP_PROXY
---> 15 import ipdb; ipdb.set_trace()
ipdb> a
self = <middleware.privoxy_tor_simplest.ProxyMiddleware object at 0x000000000488DBA8>
request = <GET http://top.mail.ru/referers.csv?id=85837&period=2&date=2014-01-30&sf=0&pp=200&filter_type=0&filter=c&gender=0&agegrou
p=0>
spider = <TopmailSpider 'topmail' at 0x42ec1d0>
ipdb> request.
request.body request.copy request.errback request.method request.url
request.callback request.dont_filter request.headers request.priority
request.cookies request.encoding request.meta request.replace
ipdb> request.headers
{'Accept-Language': ['en'], 'Accept-Encoding': ['x-gzip,gzip,deflate'], 'Accept': ['text/html,application/xhtml+xml,application/xml;
q=0.9,*/*;q=0.8'], 'User-Agent': ['Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.0 Safari/536.
3']}
ipdb> request.meta.
request.meta.clear request.meta.has_key request.meta.itervalues request.meta.setdefault request.meta.viewkeys
request.meta.copy request.meta.items request.meta.keys request.meta.update request.meta.viewvalues
request.meta.fromkeys request.meta.iteritems request.meta.pop request.meta.values
request.meta.get request.meta.iterkeys request.meta.popitem request.meta.viewitems
ipdb> request.meta
{'download_timeout': 180, 'proxy': '127.0.0.1:8118'}
А внимание обратил, потому, что нашел Scrapy: Run Using TOR and Multiple Agents и стал проверять мой код построчно.
Мои ошибки в поиски присчины начались с вот такого сообщения:¶
In []:
2015-01-05 14:53:57+0300 [topmail] ERROR: Error downloading <GET http://top.mail.ru/referers.csv?id=85837&period=2&date=2014-12-30&s
f=0&pp=200&filter_type=0&filter=catalog/hyundai/solaris&gender=0&agegroup=0>
Traceback (most recent call last):
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\web\client.py", line 1325, in request
bodyProducer, uri)
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\web\client.py", line 1182, in _requestWithEndpoint
d = self._pool.getConnection(key, endpoint)
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\web\client.py", line 1071, in getConnection
return self._newConnection(key, endpoint)
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\web\client.py", line 1083, in _newConnection
return endpoint.connect(factory)
--- <exception caught here> ---
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\internet\endpoints.py", line 548, in connect
timeout=self._timeout, bindAddress=self._bindAddress)
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\internet\posixbase.py", line 499, in connectTCP
c = tcp.Connector(host, port, factory, timeout, bindAddress, self)
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\internet\tcp.py", line 1161, in __init__
if abstract.isIPv6Address(host):
File "C:\Users\kiss\Anaconda\lib\site-packages\twisted\internet\abstract.py", line 522, in isIPv6Address
if '%' in addr:
exceptions.TypeError: argument of type 'NoneType' is not iterable
2015-01-05 14:53:57+0300 [topmail] INFO: Closing spider (finished)
2015-01-05 14:53:57+0300 [topmail] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 12,
'downloader/exception_type_count/exceptions.TypeError': 12,
'downloader/request_bytes': 4992,
'downloader/request_count': 12,
'downloader/request_method_count/GET': 12,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2015, 1, 5, 11, 53, 57, 602000),
'httpcache/miss': 12,
'log_count/DEBUG': 6,
'log_count/ERROR': 12,
'log_count/INFO': 3,
'scheduler/dequeued': 12,
'scheduler/dequeued/memory': 12,
'scheduler/enqueued': 12,
'scheduler/enqueued/memory': 12,
'start_time': datetime.datetime(2015, 1, 5, 11, 53, 50, 552000)}
2015-01-05 14:53:57+0300 [topmail] INFO: Spider closed (finished)
Я пытался понять фразу "exceptions.TypeError: argument of type 'NoneType' is not iterable"... и даже залез в Twisted
In [1]:
%load "C:\Users\kiss\Anaconda\lib\site-packages\twisted\internet\abstract.py"
In []:
# -*- test-case-name: twisted.test.test_abstract -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Support for generic select()able objects.
"""
from __future__ import division, absolute_import
from socket import AF_INET6, inet_pton, error
from zope.interface import implementer
# Twisted Imports
from twisted.python.compat import _PY3, unicode, lazyByteSlice
from twisted.python import _reflectpy3 as reflect, failure
from twisted.internet import interfaces, main
if _PY3:
def _concatenate(bObj, offset, bArray):
# Python 3 lacks the buffer() builtin and the other primitives don't
# help in this case. Just do the copy. Perhaps later these buffers can
# be joined and FileDescriptor can use writev(). Or perhaps bytearrays
# would help.
return bObj[offset:] + b"".join(bArray)
else:
def _concatenate(bObj, offset, bArray):
# Avoid one extra string copy by using a buffer to limit what we include
# in the result.
return buffer(bObj, offset) + b"".join(bArray)
class _ConsumerMixin(object):
"""
L{IConsumer} implementations can mix this in to get C{registerProducer} and
C{unregisterProducer} methods which take care of keeping track of a
producer's state.
Subclasses must provide three attributes which L{_ConsumerMixin} will read
but not write:
- connected: A C{bool} which is C{True} as long as the the consumer has
someplace to send bytes (for example, a TCP connection), and then
C{False} when it no longer does.
- disconnecting: A C{bool} which is C{False} until something like
L{ITransport.loseConnection} is called, indicating that the send buffer
should be flushed and the connection lost afterwards. Afterwards,
C{True}.
- disconnected: A C{bool} which is C{False} until the consumer no longer
has a place to send bytes, then C{True}.
Subclasses must also override the C{startWriting} method.
@ivar producer: C{None} if no producer is registered, otherwise the
registered producer.
@ivar producerPaused: A flag indicating whether the producer is currently
paused.
@type producerPaused: C{bool} or C{int}
@ivar streamingProducer: A flag indicating whether the producer was
registered as a streaming (ie push) producer or not (ie a pull
producer). This will determine whether the consumer may ever need to
pause and resume it, or if it can merely call C{resumeProducing} on it
when buffer space is available.
@ivar streamingProducer: C{bool} or C{int}
"""
producer = None
producerPaused = False
streamingProducer = False
def startWriting(self):
"""
Override in a subclass to cause the reactor to monitor this selectable
for write events. This will be called once in C{unregisterProducer} if
C{loseConnection} has previously been called, so that the connection can
actually close.
"""
raise NotImplementedError("%r did not implement startWriting")
def registerProducer(self, producer, streaming):
"""
Register to receive data from a producer.
This sets this selectable to be a consumer for a producer. When this
selectable runs out of data on a write() call, it will ask the producer
to resumeProducing(). When the FileDescriptor's internal data buffer is
filled, it will ask the producer to pauseProducing(). If the connection
is lost, FileDescriptor calls producer's stopProducing() method.
If streaming is true, the producer should provide the IPushProducer
interface. Otherwise, it is assumed that producer provides the
IPullProducer interface. In this case, the producer won't be asked to
pauseProducing(), but it has to be careful to write() data only when its
resumeProducing() method is called.
"""
if self.producer is not None:
raise RuntimeError(
"Cannot register producer %s, because producer %s was never "
"unregistered." % (producer, self.producer))
if self.disconnected:
producer.stopProducing()
else:
self.producer = producer
self.streamingProducer = streaming
if not streaming:
producer.resumeProducing()
def unregisterProducer(self):
"""
Stop consuming data from a producer, without disconnecting.
"""
self.producer = None
if self.connected and self.disconnecting:
self.startWriting()
@implementer(interfaces.ILoggingContext)
class _LogOwner(object):
"""
Mixin to help implement L{interfaces.ILoggingContext} for transports which
have a protocol, the log prefix of which should also appear in the
transport's log prefix.
"""
def _getLogPrefix(self, applicationObject):
"""
Determine the log prefix to use for messages related to
C{applicationObject}, which may or may not be an
L{interfaces.ILoggingContext} provider.
@return: A C{str} giving the log prefix to use.
"""
if interfaces.ILoggingContext.providedBy(applicationObject):
return applicationObject.logPrefix()
return applicationObject.__class__.__name__
def logPrefix(self):
"""
Override this method to insert custom logging behavior. Its
return value will be inserted in front of every line. It may
be called more times than the number of output lines.
"""
return "-"
@implementer(
interfaces.IPushProducer, interfaces.IReadWriteDescriptor,
interfaces.IConsumer, interfaces.ITransport,
interfaces.IHalfCloseableDescriptor)
class FileDescriptor(_ConsumerMixin, _LogOwner):
"""
An object which can be operated on by select().
This is an abstract superclass of all objects which may be notified when
they are readable or writable; e.g. they have a file-descriptor that is
valid to be passed to select(2).
"""
connected = 0
disconnected = 0
disconnecting = 0
_writeDisconnecting = False
_writeDisconnected = False
dataBuffer = b""
offset = 0
SEND_LIMIT = 128*1024
def __init__(self, reactor=None):
"""
@param reactor: An L{IReactorFDSet} provider which this descriptor will
use to get readable and writeable event notifications. If no value
is given, the global reactor will be used.
"""
if not reactor:
from twisted.internet import reactor
self.reactor = reactor
self._tempDataBuffer = [] # will be added to dataBuffer in doWrite
self._tempDataLen = 0
def connectionLost(self, reason):
"""The connection was lost.
This is called when the connection on a selectable object has been
lost. It will be called whether the connection was closed explicitly,
an exception occurred in an event handler, or the other end of the
connection closed it first.
Clean up state here, but make sure to call back up to FileDescriptor.
"""
self.disconnected = 1
self.connected = 0
if self.producer is not None:
self.producer.stopProducing()
self.producer = None
self.stopReading()
self.stopWriting()
def writeSomeData(self, data):
"""
Write as much as possible of the given data, immediately.
This is called to invoke the lower-level writing functionality, such
as a socket's send() method, or a file's write(); this method
returns an integer or an exception. If an integer, it is the number
of bytes written (possibly zero); if an exception, it indicates the
connection was lost.
"""
raise NotImplementedError("%s does not implement writeSomeData" %
reflect.qual(self.__class__))
def doRead(self):
"""
Called when data is available for reading.
Subclasses must override this method. The result will be interpreted
in the same way as a result of doWrite().
"""
raise NotImplementedError("%s does not implement doRead" %
reflect.qual(self.__class__))
def doWrite(self):
"""
Called when data can be written.
@return: C{None} on success, an exception or a negative integer on
failure.
@see: L{twisted.internet.interfaces.IWriteDescriptor.doWrite}.
"""
if len(self.dataBuffer) - self.offset < self.SEND_LIMIT:
# If there is currently less than SEND_LIMIT bytes left to send
# in the string, extend it with the array data.
self.dataBuffer = _concatenate(
self.dataBuffer, self.offset, self._tempDataBuffer)
self.offset = 0
self._tempDataBuffer = []
self._tempDataLen = 0
# Send as much data as you can.
if self.offset:
l = self.writeSomeData(lazyByteSlice(self.dataBuffer, self.offset))
else:
l = self.writeSomeData(self.dataBuffer)
# There is no writeSomeData implementation in Twisted which returns
# < 0, but the documentation for writeSomeData used to claim negative
# integers meant connection lost. Keep supporting this here,
# although it may be worth deprecating and removing at some point.
if isinstance(l, Exception) or l < 0:
return l
self.offset += l
# If there is nothing left to send,
if self.offset == len(self.dataBuffer) and not self._tempDataLen:
self.dataBuffer = b""
self.offset = 0
# stop writing.
self.stopWriting()
# If I've got a producer who is supposed to supply me with data,
if self.producer is not None and ((not self.streamingProducer)
or self.producerPaused):
# tell them to supply some more.
self.producerPaused = 0
self.producer.resumeProducing()
elif self.disconnecting:
# But if I was previously asked to let the connection die, do
# so.
return self._postLoseConnection()
elif self._writeDisconnecting:
# I was previously asked to half-close the connection. We
# set _writeDisconnected before calling handler, in case the
# handler calls loseConnection(), which will want to check for
# this attribute.
self._writeDisconnected = True
result = self._closeWriteConnection()
return result
return None
def _postLoseConnection(self):
"""Called after a loseConnection(), when all data has been written.
Whatever this returns is then returned by doWrite.
"""
# default implementation, telling reactor we're finished
return main.CONNECTION_DONE
def _closeWriteConnection(self):
# override in subclasses
pass
def writeConnectionLost(self, reason):
# in current code should never be called
self.connectionLost(reason)
def readConnectionLost(self, reason):
# override in subclasses
self.connectionLost(reason)
def _isSendBufferFull(self):
"""
Determine whether the user-space send buffer for this transport is full
or not.
When the buffer contains more than C{self.bufferSize} bytes, it is
considered full. This might be improved by considering the size of the
kernel send buffer and how much of it is free.
@return: C{True} if it is full, C{False} otherwise.
"""
return len(self.dataBuffer) + self._tempDataLen > self.bufferSize
def _maybePauseProducer(self):
"""
Possibly pause a producer, if there is one and the send buffer is full.
"""
# If we are responsible for pausing our producer,
if self.producer is not None and self.streamingProducer:
# and our buffer is full,
if self._isSendBufferFull():
# pause it.
self.producerPaused = 1
self.producer.pauseProducing()
def write(self, data):
"""Reliably write some data.
The data is buffered until the underlying file descriptor is ready
for writing. If there is more than C{self.bufferSize} data in the
buffer and this descriptor has a registered streaming producer, its
C{pauseProducing()} method will be called.
"""
if isinstance(data, unicode): # no, really, I mean it
raise TypeError("Data must not be unicode")
if not self.connected or self._writeDisconnected:
return
if data:
self._tempDataBuffer.append(data)
self._tempDataLen += len(data)
self._maybePauseProducer()
self.startWriting()
def writeSequence(self, iovec):
"""
Reliably write a sequence of data.
Currently, this is a convenience method roughly equivalent to::
for chunk in iovec:
fd.write(chunk)
It may have a more efficient implementation at a later time or in a
different reactor.
As with the C{write()} method, if a buffer size limit is reached and a
streaming producer is registered, it will be paused until the buffered
data is written to the underlying file descriptor.
"""
for i in iovec:
if isinstance(i, unicode): # no, really, I mean it
raise TypeError("Data must not be unicode")
if not self.connected or not iovec or self._writeDisconnected:
return
self._tempDataBuffer.extend(iovec)
for i in iovec:
self._tempDataLen += len(i)
self._maybePauseProducer()
self.startWriting()
def loseConnection(self, _connDone=failure.Failure(main.CONNECTION_DONE)):
"""Close the connection at the next available opportunity.
Call this to cause this FileDescriptor to lose its connection. It will
first write any data that it has buffered.
If there is data buffered yet to be written, this method will cause the
transport to lose its connection as soon as it's done flushing its
write buffer. If you have a producer registered, the connection won't
be closed until the producer is finished. Therefore, make sure you
unregister your producer when it's finished, or the connection will
never close.
"""
if self.connected and not self.disconnecting:
if self._writeDisconnected:
# doWrite won't trigger the connection close anymore
self.stopReading()
self.stopWriting()
self.connectionLost(_connDone)
else:
self.stopReading()
self.startWriting()
self.disconnecting = 1
def loseWriteConnection(self):
self._writeDisconnecting = True
self.startWriting()
def stopReading(self):
"""Stop waiting for read availability.
Call this to remove this selectable from being notified when it is
ready for reading.
"""
self.reactor.removeReader(self)
def stopWriting(self):
"""Stop waiting for write availability.
Call this to remove this selectable from being notified when it is ready
for writing.
"""
self.reactor.removeWriter(self)
def startReading(self):
"""Start waiting for read availability.
"""
self.reactor.addReader(self)
def startWriting(self):
"""Start waiting for write availability.
Call this to have this FileDescriptor be notified whenever it is ready for
writing.
"""
self.reactor.addWriter(self)
# Producer/consumer implementation
# first, the consumer stuff. This requires no additional work, as
# any object you can write to can be a consumer, really.
producer = None
bufferSize = 2**2**2**2
def stopConsuming(self):
"""Stop consuming data.
This is called when a producer has lost its connection, to tell the
consumer to go lose its connection (and break potential circular
references).
"""
self.unregisterProducer()
self.loseConnection()
# producer interface implementation
def resumeProducing(self):
if self.connected and not self.disconnecting:
self.startReading()
def pauseProducing(self):
self.stopReading()
def stopProducing(self):
self.loseConnection()
def fileno(self):
"""File Descriptor number for select().
This method must be overridden or assigned in subclasses to
indicate a valid file descriptor for the operating system.
"""
return -1
def isIPAddress(addr):
"""
Determine whether the given string represents an IPv4 address.
@type addr: C{str}
@param addr: A string which may or may not be the decimal dotted
representation of an IPv4 address.
@rtype: C{bool}
@return: C{True} if C{addr} represents an IPv4 address, C{False}
otherwise.
"""
dottedParts = addr.split('.')
if len(dottedParts) == 4:
for octet in dottedParts:
try:
value = int(octet)
except ValueError:
return False
else:
if value < 0 or value > 255:
return False
return True
return False
def isIPv6Address(addr):
"""
Determine whether the given string represents an IPv6 address.
@param addr: A string which may or may not be the hex
representation of an IPv6 address.
@type addr: C{str}
@return: C{True} if C{addr} represents an IPv6 address, C{False}
otherwise.
@rtype: C{bool}
"""
if '%' in addr:
addr = addr.split('%', 1)[0]
if not addr:
return False
try:
# This might be a native implementation or the one from
# twisted.python.compat.
inet_pton(AF_INET6, addr)
except (ValueError, error):
return False
return True
__all__ = ["FileDescriptor", "isIPAddress", "isIPv6Address"]
Конечно же, я убеждаю себя, что я не такой уж и тупой. Новогодние пьянки, вынужденные переключения с темы на тему... не спобствуют быстрому усвоению нового материала....
Полагаю, что добавилось еще и подсознаие, у меня ведь уже работает пара "боевых" пауков, я теперь крутой "специалист" ... и подсознаию захотелось крутых ошибок... Потому и полез искать итераторы
Посты чуть ниже также могут вас заинтересовать
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