Created
July 3, 2013 15:41
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Threaded downloader
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# -*- coding: utf-8 -*- | |
import os | |
from Queue import Queue | |
from urlparse import urlparse | |
from threading import Thread, Lock | |
import requests | |
CHUNCK_SIZE = 8192 | |
class Downloader(object): | |
class Errors(object): | |
def __init__(self): | |
self.urls = [] | |
self.lock = Lock() | |
def append(self, url): | |
with self.lock: | |
self.urls.append(url) | |
def __init__(self, queue, errors): | |
self._queue = queue | |
self._errors = errors | |
@staticmethod | |
def _download(url, filepath): | |
file_ = open(filepath, 'wb') | |
response = requests.get(url) | |
response.raise_for_status() | |
for chunck in response.iter_content(CHUNCK_SIZE): | |
if not chunck: | |
break | |
file_.write(chunck) | |
file_.close() | |
def __call__(self): | |
q = self._queue | |
err = self._errors | |
while 1: | |
try: | |
url, filepath = q.get() | |
type(self)._download(url, filepath) | |
except requests.RequestException: | |
err.append(url) | |
finally: | |
q.task_done() | |
def download(root_path, conns, urls): | |
q = Queue() | |
workers = [] | |
errors = Downloader.Errors() | |
for url in urls: | |
url_path = urlparse(url).path | |
filename = url_path.rsplit('/', 1)[-1] | |
path = os.path.join(root_path, os.path.dirname(url_path)[1:]) | |
try: | |
os.makedirs(path) | |
except OSError, e: | |
if not 'File exists' in str(e): # OK if dir already exists. | |
raise e | |
filepath = os.path.join(path, filename) | |
q.put((url, filepath)) | |
for _ in range(max(conns, len(urls))): | |
t = Thread(target=Downloader(q, errors)) | |
t.daemon = True | |
t.start() | |
workers.append(t) | |
q.join() | |
return errors.urls |
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