245 lines
7.5 KiB
Python
245 lines
7.5 KiB
Python
""" Models for the history. This history should be able to generate history
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entries, which looks like human-based browsing, according to a dedicated user
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interests, keywords...
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"""
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from collections import namedtuple
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import random
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from math import floor
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from queue import Queue
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from xml.etree import ElementTree as ET
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from datetime import datetime
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from django.db import models
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import profiles.models as profiles
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from crawl import crawl
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from pinocchio.settings import HISTORY_MIN
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from .tor_runner import TorInstance
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class InvalidXml(Exception):
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def __init__(self, what='unexpected XML data.'):
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super().__init__()
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self.what = what
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def __str__(self):
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return "Invalid XML: " + self.what
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class HistoryEntry(models.Model):
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""" A history entry, aka a url, and a timestamp.
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"""
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search = models.URLField(help_text="The url to be searched")
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timestamp = models.DateTimeField()
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history = models.ForeignKey(
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'History',
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on_delete=models.CASCADE
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)
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def __str__(self):
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""" Returns the string representation of a history entry.
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"""
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return "{} : {}".format(self.timestamp, self.search)
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def to_xml(self, xml_root):
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entry = ET.Element('history')
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entry_url = ET.Element('url')
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entry_url.text = self.search
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entry_ts = ET.Element('timestamp')
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entry_ts.text = self.timestamp.timestamp()
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entry.append(entry_url)
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entry.append(entry_ts)
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xml_root.append(entry)
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@staticmethod
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def from_xml(xml_root, in_history):
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if xml_root.tag != 'history':
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raise InvalidXml("expected <history> tag here.")
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url, timestamp = None, None
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for child in xml_root:
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if child.tag == 'url':
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url = child.text
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elif child.tag == 'timestamp':
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try:
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timestamp = datetime.fromtimestamp(child.text)
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except TypeError:
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raise InvalidXml("invalid timestamp {}".format(child.text))
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else:
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raise InvalidXml("unknown tag {} as child of <history>".format(
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child.tag))
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output = HistoryEntry()
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output.search = url
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output.timestamp = timestamp
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output.history = in_history
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return output
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class History(models.Model):
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""" A history for a user, containing some web connections (http, https).
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Each history is timed, in a human-behaviour manner. """
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start_ts = models.DateTimeField(
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help_text=('The starting timestamp of the history. Useful for '
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'cron-like structure.')
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)
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played = models.BooleanField(default=False)
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user = models.ForeignKey(
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profiles.Profile,
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on_delete=models.CASCADE
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)
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def return_history(self):
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""" Returns the history, sorted by increasing timestamps
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"""
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output_history = self.historyentry_set.order_by('timestamp')
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output_history = [(item.search, item.timestamp.date())
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for item in output_history]
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return output_history
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def __str__(self):
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""" Returns the string representation of a history.
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"""
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history_set = self.historyentry_set.order_by('timestamp')
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header = "[History]:\n"
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return header + "\n".join(history_set)
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def play_histories(self):
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""" Actually plays the history.
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"""
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self.played = True
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runner = TorInstance(self.history)
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self.save()
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def to_xml(self, xml_root):
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''' Exports the current history to xml '''
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hist_node = ET.Element("history", attrib={
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'start-ts': self.start_ts,
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'played': 1 if self.played else 0,
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'user': self.user.pk,
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})
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xml_root.append(hist_node)
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for entry in self.historyentry_set:
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entry.to_xml(hist_node)
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@staticmethod
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def from_xml(xml_root):
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''' Loads an history from an XML file '''
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REQUIRED_ATTR = ['start-ts', 'played', 'user']
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if xml_root.tag != 'history':
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raise InvalidXml('unexpected node {} as root of an history'.format(
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xml_root.tag))
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for attr in REQUIRED_ATTR:
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if attr not in xml_root.attrib:
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raise InvalidXml(('missing attribute "{}" for tag of type '
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'history').format(attr))
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start_ts = xml_root.attrib['start-ts']
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played = xml_root.attrib['played']
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user_pk = xml_root.attrib['user']
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users = History.objects.filter(pk=1)
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if len(users) != 1:
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raise InvalidXml('primary key for History {} is invalid'.format(
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user_pk))
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output = History()
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output.start_ts = start_ts
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output.played = played > 0
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output.user = users[0]
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for child in xml_root:
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HistoryEntry.from_xml(child, output)
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return output
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PartialHistoryEntry = namedtuple('PartialHistoryEntry',
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['url', 'timestamp'])
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def generate_partial_history(user, t_start):
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""" Generate the part of the history resulting from the crawl starting at
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the given url.
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"""
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timestamp = t_start
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result = []
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basis = generate_first_url(user)
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result.append(PartialHistoryEntry(basis, timestamp))
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t_start += 5 * random.weibullvariate(1, 1.5)
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queue = Queue()
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crawler = crawl.CrawlingThread(basis, queue)
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crawler.start()
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crawler.join()
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urls = queue.get()
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for url in urls:
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t_start += 5 * random.weibullvariate(1, 1.5)
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result.append(PartialHistoryEntry(url, timestamp))
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return result
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def generate_first_url(user):
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""" Generate the first url of a partial history, based on the user
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information. """
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def nonempty(seq):
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out = []
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for elt in seq:
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if elt:
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out.append(elt)
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return out
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all_keywords = profiles.Keyword.objects.filter(
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interest__profile__in=[user])
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all_websites = profiles.Website.objects.filter(
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interest__profile__in=[user])
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all_places = profiles.Place.objects.filter(
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interest__profile__in=[user])
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all_events = profiles.Event.objects.filter(
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interest__profile__in=[user])
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interest = random.choice(nonempty([
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all_keywords,
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all_websites,
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all_places,
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all_events,
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]))
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search_term = random.choice(interest)
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url = search_term.generate_url(user)
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return url
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def generate_history(user, start_time):
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""" Generate a new history for the user `user`, starting from timestamp
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`ts_start`.
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A few heuristics are used in order to give the impression that the history
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is actually played by a user.
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"""
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# let's define a new history object.
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history = History(start_ts=start_time, user=user)
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length = HISTORY_MIN + floor(10 * random.weibullvariate(1, 1.5))
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history.full_clean()
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history.save()
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history_line = 0
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current_timestamp = start_time.timestamp()
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while history_line < length:
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current_timestamp += 5 * random.weibullvariate(1, 2.8)
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history_list = generate_partial_history(user, current_timestamp)
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current_timestamp = \
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history_list[-1].timestamp + 5 * random.weibullvariate(1, 5)
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for (url, timestamp) in history_list:
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new_line = HistoryEntry(
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search=url,
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timestamp=datetime.fromtimestamp(timestamp),
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history=history
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)
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new_line.full_clean()
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new_line.save()
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return history
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