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warcnam.py
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warcnam.py
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# -*- coding: UTF-8 -*-
import re
from tempfile import TemporaryFile
from datetime import datetime
# TODO: use Qt5
# TODO: logging
# TODO: protocol "data:"
from PyQt4.QtCore import QTimer, QUrl, QString, QLatin1String
from PyQt4.QtNetwork import QNetworkRequest, \
QNetworkReply, \
QNetworkAccessManager
from hanzo.warctools import warc, WarcRecord
from hanzo.httptools import RequestMessage, ResponseMessage
def qstring_to_str(qs):
return unicode(qs.toUtf8(), encoding="utf-8").encode("utf-8")
def str_to_qstring(s):
return QString.fromUtf8(s)
class ErrorNetworkReply(QNetworkReply):
def __init__(self, request, error_string, error, parent=None):
super(ErrorNetworkReply, self).__init__(parent)
self.setUrl(request.url())
self.setOpenMode(QNetworkReply.ReadOnly)
self.setError(error, error_string)
QTimer.singleShot(0, lambda: self.error.emit(error))
QTimer.singleShot(0, lambda: self.finished.emit())
def abort(self):
pass
def bytesAvailable(self):
return 0
def readData(self):
return bytes()
class ContentNotFoundNetworkReply(ErrorNetworkReply):
def __init__(self, request, error_string, parent=None):
super(ContentNotFoundNetworkReply, self) \
.__init__(request, error_string, \
QNetworkReply.ContentNotFoundError, parent)
class WarcNetworkReply(QNetworkReply):
_warc_record = None
_temp_data = None
_network_reply = None
_data = None
_offset = None
def __init__(self, warc_record=None, network_reply=None, parent=None):
super(WarcNetworkReply, self).__init__(parent)
if ((warc_record is not None) and (network_reply is not None)) \
or ((warc_record is None) and (network_reply is None)):
raise RuntimeError("Specify warc_record OR network_reply")
self._offset = 0
if warc_record is not None:
self._init_from_warc_record(warc_record)
else:
self._init_from_network_reply(network_reply)
def abort(self):
if self._network_reply:
self._network_reply.readyRead.disconnect(self._reply_ready_read)
self._network_reply.finished.disconnect(self._reply_finished)
self._network_reply.error.disconnect(self._reply_error)
self._network_reply.abort()
self._network_reply = None
def isSequential(self):
return True
def bytesAvailable(self):
ba = len(self._data) - self._offset \
+ super(QNetworkReply, self).bytesAvailable()
return ba
def readData(self, max_size):
max_size = min(max_size, len(self._data) - self._offset)
start = self._offset
self._offset += max_size
return str(self._data[start:self._offset])
def _init_from_network_reply(self, network_reply):
self._data = ""
self._temp_data = TemporaryFile()
self._network_reply = network_reply
self._network_reply.readyRead.connect(self._reply_ready_read)
self._network_reply.finished.connect(self._reply_finished)
self._network_reply.error.connect(self._reply_error)
def _init_from_warc_record(self, warc_record):
self._warc_record = warc_record
self.open(QNetworkReply.ReadOnly | QNetworkReply.Unbuffered)
self.setUrl(QUrl(str_to_qstring(self._warc_record.url)))
rs = ResponseMessage(RequestMessage())
rs.feed(self._warc_record.content[1])
for name, value in rs.header.headers:
self.setRawHeader(name, value)
self.setAttribute(QNetworkRequest.HttpStatusCodeAttribute, \
rs.header.code)
self.setAttribute(QNetworkRequest.HttpReasonPhraseAttribute, \
rs.header.phrase)
self._check_for_redirect(rs.header.code)
QTimer.singleShot(0, lambda: self.metaDataChanged.emit())
self._data = rs.get_body()
QTimer.singleShot(0, lambda: self.readyRead.emit())
QTimer.singleShot(0, lambda: self.finished.emit())
def _reply_ready_read(self):
self._temp_data.write(self._network_reply.readAll())
def _reply_finished(self):
self._network_reply.readyRead.disconnect(self._reply_ready_read)
self._network_reply.finished.disconnect(self._reply_finished)
self._network_reply.error.disconnect(self._reply_error)
status_code = self._network_reply.attribute(QNetworkRequest \
.HttpStatusCodeAttribute)
if not status_code.isValid():
self._temp_data.close()
self._temp_data = None
self._network_reply = None
QTimer.singleShot(0, lambda: self.finished.emit())
return
headers = dict()
for header in self._network_reply.rawHeaderList():
temp = str(self._network_reply.rawHeader(header))
headers[str(header)] = re.sub("\s", " ", temp)
elements = []
for name, value in headers.iteritems():
elements.append(name + ": " + value)
elements.append("")
url = qstring_to_str(self._network_reply.url().toString())
status_msg = self._network_reply.attribute(QNetworkRequest \
.HttpReasonPhraseAttribute)
assert(status_msg.isValid())
self._temp_data.seek(0)
# XXX: we can't get HTTP version from Qt webkit, assumes 1.1
h_status = "HTTP/1.1 " + str(status_code.toString()) + " " \
+ str(status_msg.toString())
content_data = h_status + "\r\n" \
+ "\r\n".join(elements) + "\r\n" \
+ self._temp_data.read()
content_type = ResponseMessage.CONTENT_TYPE
content = (content_type, content_data)
wr = warc.make_response(WarcRecord.random_warc_uuid(),
warc.warc_datetime_str(datetime.utcnow()), url, content, None)
self._temp_data.close()
self._temp_data = None
self.manager().current_warc.write_record(wr)
self._init_from_warc_record(wr)
self._network_reply = None
def _reply_error(self, code):
self.error.emit(self._network_reply.error())
def _check_for_redirect(self, status_code):
if status_code in (301, 302, 303, 307):
header = self.rawHeader("Location")
url = QUrl.fromEncoded(header)
if not url.isValid():
url = QUrl(QLatin1String(header))
self.setAttribute(QNetworkRequest.RedirectionTargetAttribute, url)
class WarcNetworkAccessManager(QNetworkAccessManager):
_current_warc = None
def createRequest(self, operation, request, data):
if not self._current_warc:
return super(WarcNetworkAccessManager, self) \
.createRequest(operation, request, data)
url = qstring_to_str(request.url().toString())
warc_record = self._current_warc.find_record(url)
if warc_record:
network_reply = WarcNetworkReply(warc_record=warc_record, \
parent=self)
else:
if not self._current_warc.read_only:
initial_reply = super(WarcNetworkAccessManager, self) \
.createRequest(operation, request, data)
network_reply = WarcNetworkReply(network_reply=initial_reply, \
parent=self)
else:
network_reply = ContentNotFoundNetworkReply(request, \
"Content not found on WARC file", self)
network_reply.setRequest(request)
network_reply.setOperation(operation)
return network_reply
@property
def current_warc(self):
return self._current_warc
@current_warc.setter
def current_warc(self, warc):
self._current_warc = warc