You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.4 KiB
96 lines
2.4 KiB
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright 2014, 2015 Mike Fährmann
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License version 2 as
|
|
# published by the Free Software Foundation.
|
|
|
|
"""Common classes and constants used by extractor modules."""
|
|
|
|
import time
|
|
import queue
|
|
import requests
|
|
import threading
|
|
from .message import Message
|
|
from .. import config
|
|
|
|
class Extractor():
|
|
|
|
category = ""
|
|
subcategory = ""
|
|
directory_fmt = [""]
|
|
filename_fmt = ""
|
|
|
|
def __init__(self):
|
|
self.session = requests.Session()
|
|
|
|
def __iter__(self):
|
|
return self.items()
|
|
|
|
def items(self):
|
|
yield Message.Version, 1
|
|
|
|
def request(self, url, encoding=None, *args, **kwargs):
|
|
response = safe_request(self.session, url, *args, **kwargs)
|
|
if encoding:
|
|
response.encoding = encoding
|
|
return response
|
|
|
|
|
|
class AsynchronousExtractor(Extractor):
|
|
|
|
def __init__(self):
|
|
Extractor.__init__(self)
|
|
queue_size = int(config.get(("queue-size",), default=5))
|
|
self.__queue = queue.Queue(maxsize=queue_size)
|
|
self.__thread = threading.Thread(target=self.async_items, daemon=True)
|
|
|
|
def __iter__(self):
|
|
get = self.__queue.get
|
|
done = self.__queue.task_done
|
|
|
|
self.__thread.start()
|
|
while True:
|
|
task = get()
|
|
if task is None:
|
|
return
|
|
if isinstance(task, Exception):
|
|
raise task
|
|
yield task
|
|
done()
|
|
|
|
def async_items(self):
|
|
put = self.__queue.put
|
|
try:
|
|
for task in self.items():
|
|
put(task)
|
|
except Exception as e:
|
|
put(e)
|
|
put(None)
|
|
|
|
|
|
def safe_request(session, url, method="GET", *args, **kwargs):
|
|
tries = 0
|
|
while True:
|
|
# try to connect to remote source
|
|
try:
|
|
r = session.request(method, url, *args, **kwargs)
|
|
except requests.exceptions.ConnectionError:
|
|
tries += 1
|
|
time.sleep(1)
|
|
if tries == 5:
|
|
raise
|
|
continue
|
|
|
|
# reject error-status-codes
|
|
if r.status_code != requests.codes.ok:
|
|
tries += 1
|
|
time.sleep(1)
|
|
if tries == 5:
|
|
r.raise_for_status()
|
|
continue
|
|
|
|
# everything ok -- proceed to download
|
|
return r
|