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Initial check-in of Tornado News

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
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To protect your rights, we need to make restrictions that forbid
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you have. You must make sure that they, too, receive or can get the
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We protect your rights with two steps: (1) copyright the software, and
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
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either verbatim or with modifications and/or translated into another
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the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
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running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
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Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
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copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
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distribute such modifications or work under the terms of Section 1
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stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
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c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
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License. (Exception: if the Program itself is interactive but
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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# Tornado news reader/aggregator configuration file.
# Feed metadata
meta:
title: My News Feed
link: http://example.com/news/
description: A private aggregation of news articles
language: en
owner:
name: John Smith
email: jsmith@example.com
cache: /tmp/cache
output:
html: /var/www/localhost/index.html
rss: /var/www/localhost/feed.rss
# A basic template for the website
html_templates:
base: >
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=utf-8" />
<title>{{title}}</title>
<link rel="stylesheet" type="text/css" href="style.css" />
<link rel="alternate" href="/feed.rss" title="" type="application/rss+xml" />
</head>
<body>
<h1>{{title}}</h1>
<hr />
{% raw entries %}
</body>
</html>
entry: >
<div class="entry border">
<div class="entry header">
<h1 class="entry header title"><a href="{{link}}" name="{{anchor}}">[{{source}}] {{title}}</a></h1>
<p class="entry header meta">
<span class="entry header author">{{author}}</span>
<span class="entry header timestamp">{{updated_str}}</span>
</p>
</div>
<div class="entry body">
{% raw content %}
</div>
</div>
# Feed sources, have as many as you like
sources:
- name: Tornado
url: https://groups.google.com/forum/feed/python-tornado-announce/msgs/rss.xml?num=15

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body {
background-color: #000;
color: #fff;
};
a {
color: #00f;
};
div.entry.border {
margin: 3em;
border: 1px solid #fff;
background-color: #333;
color: #fff;
}

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#!/usr/bin/python
from setuptools import setup
from tornadonews import __version__
setup(name = 'tornadonews',
version = __version__,
description = 'Tornado News: a simple news aggregator',
packages = [
'tornadonews',
],
entry_points = {
'console_scripts': [
'tornadonews=tornadonews.tornadonews:main',
],
},
)

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__version__ = '0.0.1'

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#!/usr/bin/env python
"""
TornadoNews: Simple RSS/Atom aggregator written in Tornado.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
from tornado.template import Template
from tornado.httpclient import AsyncHTTPClient
from tornado.ioloop import IOLoop
import feedparser
import yaml
import argparse
from calendar import timegm
from functools import partial
import logging
from multiprocessing.pool import ThreadPool
from multiprocessing import cpu_count
from os import makedirs, path, stat
from hashlib import sha1
import feedgenerator
from six import StringIO, text_type, binary_type, PY3
import datetime
if PY3:
# Doesn't seem to work in Python 3. Until further notice, let's
# disable this for now.
# http://blog.yjl.im/2013/12/workaround-of-libxml2-unsupported.html
feedparser.PREFERRED_XML_PARSERS.remove('drv_libxml2')
class FeedEntry(object):
"""
FeedEntry: a simple object for storing the specifics of an article
so that they can be grouped and sorted.
"""
def __init__(self, source, entry_id, link, title, author,
updated, content):
"""
Construct a new FeedEntry object.
"""
self._source = text_type(source)
self._id = text_type(entry_id)
self._author = text_type(author)
self._anchor = None
self._link = text_type(link)
self._title = text_type(title)
self._updated = float(updated)
self._content = text_type(content)
@classmethod
def from_entry(cls, source, entry):
"""
Parse the feedparser-generated entry dict and return a FeedEntry
object from it.
"""
return cls(
source, entry['id'], entry['link'], entry['title'],
entry.get('author') or 'Anonymous',
timegm(entry.get('updated_parsed') or \
entry['published_parsed']),
entry.get('content') or entry['summary'])
@property
def raw(self):
"""
Dump the feed entry so that it can be serialised safely and
later returned.
"""
return {
'source': self.source,
'entry_id': self.id,
'link': self.link,
'title': self.title,
'author': self.author,
'updated': self.updated,
'content': self.content,
}
@property
def source(self):
return self._source
@property
def id(self):
return self._id
@property
def anchor(self):
if self._anchor is None:
self._anchor = sha1(self.id.encode('UTF-8')).hexdigest()
return self._anchor
@property
def title(self):
return self._title
@property
def author(self):
return self._author
@property
def link(self):
return self._link
@property
def updated(self):
return self._updated
@property
def content(self):
return self._content
def __lt__(self, other):
if not isinstance(other, FeedEntry):
return NotImplemented
return self.updated < other.updated
def __unicode__(self):
return u'[%s] %s' % (self.source, self.title)
if PY3: # Python 3
def __str__(self):
return self.__unicode__()
else: # Python 2
def __str__(self):
return self.__unicode__().encode('utf8')
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self)
class FeedFetcher(object):
"""
FeedFetcher: A simplified RSS/Atom feed retriever and parser. This
uses Tornado's asynchronous HTTP client to retrieve the individual
feeds as they're fed into the object using the fetch method.
When the caller is done, they call collate, giving a callback function
that receives the collated list at the end.
"""
def __init__(self, cache=None, num_workers=None, io_loop=None):
if io_loop is None:
io_loop = IOLoop.current()
if num_workers is None:
num_workers = cpu_count()
self._io_loop = io_loop
self._log = logging.getLogger(self.__class__.__name__)
self._client = AsyncHTTPClient()
self._cache = cache
self._entries = []
self._pending = set()
self._fetched = False
self._pool = ThreadPool(processes=num_workers)
self._on_done = None
@property
def entries(self):
return list(self._entries)
def fetch(self, name, url):
"""
Fetch the feed named 'name', at the address, 'url'.
"""
self._log.info('Retrieving %s (%s)', name, url)
self._fetched = False
self._pending.add(url)
cache_dir = self._get_dir_for_url(url)
if (cache_dir is not None) and path.isdir(cache_dir):
if_modified_since=stat(path.join(cache_dir, 'body')).st_mtime
else:
if_modified_since=None
self._client.fetch(url,
callback=partial(self._on_get_done, name,
url, cache_dir),
if_modified_since=if_modified_since)
def _get_dir_for_url(self, url):
if self._cache is None:
return None
url_hash = sha1(url.encode('UTF-8')).hexdigest()
return path.join(
self._cache, url_hash[0:2], url_hash[2:4], url_hash[4:])
def _on_get_done(self, name, url, cache_dir, response):
self._log.info('Finished retrieving %s (%s), result %s',
name, url, response.reason)
try:
if response.code == 304: # Not modified
# Read from cache
self._log.info('Not modified, read from cache')
body = open(path.join(cache_dir, 'body'),'rb').read()
cached = True
self._log.debug('Body type: %s (cache)', type(body))
else:
# Check for exceptions
response.rethrow()
# Grab body data
body = response.body
cached = False
self._log.debug('Body type: %s (http)', type(body))
# Dump to cache
if cache_dir is not None:
if not path.isdir(cache_dir):
makedirs(cache_dir)
# Write out headers
yaml.safe_dump(dict(response.headers),
stream=open(path.join(cache_dir,
'headers.yml'),'w'),
default_flow_style=False)
# Write out raw body
open(path.join(cache_dir, 'body'),'wb').write(body)
# Hand off to thread pool
self._pool.apply_async(self._process,
args=(name, url, body, cache_dir, cached))
except:
self._log.exception('Failed to process feed %s (%s)',
name, url)
self._mark_done(url)
def _process(self, name, url, body, cache_dir, cached):
self._log.info('Processing feed %s', name)
try:
entries_cache = path.join(cache_dir, 'entries.yml')
entries = None
try:
if cached and path.isfile(entries_cache):
entries = list(map(lambda e : FeedEntry(**e),
list(yaml.safe_load(
open(entries_cache,'r')))))
except:
self._log.debug('Failed to read cache, ignoring',
exc_info=1)
cached = False
if entries is None:
parsed = feedparser.parse(body)
# Extract the entries from the feed
entries = list(map(partial(FeedEntry.from_entry, name),
parsed['entries']))
if not cached and (cache_dir is not None):
cache_out = yaml.safe_dump([e.raw for e in entries])
open(entries_cache,'wb').write(cache_out.encode('UTF-8'))
except:
self._log.exception('Failed to process feed %s (%s)',
name, url)
entries = None
# Hand back to main loop
self._io_loop.add_callback(self._mark_done, url, entries)
def _mark_done(self, url, entries=None):
self._log.info('%s parsed', url)
if entries is not None:
self._entries.extend(entries)
self._pending.discard(url)
self._io_loop.add_callback(self._check_finished)
def _check_finished(self):
self._log.debug('Fetched? %s Pending: %s',
self._fetched, self._pending)
if self._fetched and not bool(self._pending):
self._io_loop.add_callback(self._emit)
def collate(self, callback=None):
"""
Wait for all feeds to be loaded, then collate the resulting
entries together for display.
"""
# No more to fetch after this.
self._fetched = True
self._io_loop.add_callback(self._check_finished)
self._log.info('Waiting for fetch to complete')
self._on_done = callback
def _emit(self):
self._log.info('Collating results')
self._entries.sort(key=lambda e : e.updated, reverse=True)
if self._on_done is not None:
self._io_loop.add_callback(self._on_done, list(self._entries))
class FeedEmitter(object):
"""
FeedEmitter: Simple news item aggregator and emitter. This takes a
list of FeedEntry objects and optionally, some HTML templates. The
make_rss and make_html methods then generate RSS or HTML from these
feed items.
"""
def __init__(self, entries, html_base=None, html_entry=None):
self._log = logging.getLogger(self.__class__.__name__)
self._entries = entries
self._html_base = html_base
self._html_entry = html_entry
self._log.info('Emitter constructed with %d entries',
len(entries))
def make_rss(self, **kwargs):
self._log.info('Emitting RSS')
rss = feedgenerator.Rss201rev2Feed(**kwargs)
for entry in self._entries:
rss.add_item(
title=u'[%s] %s' % (entry.source, entry.title),
link=entry.link,
description=entry.content,
author_name=entry.author,
pubdate=datetime.datetime.fromtimestamp(entry.updated),
unique_id=entry.id)
out = StringIO()
rss.write(out, 'utf-8')
return out.getvalue()
def make_html(self, **kwargs):
self._log.info('Emitting HTML')
t = Template(self._html_base)
entries = '\n'.join(list(map(self._entry_to_html, self._entries)))
return t.generate(entries=entries, **kwargs)
def _entry_to_html(self, entry):
t = Template(self._html_entry)
return text_type(t.generate(source=entry.source,
anchor=entry.anchor, id=entry.id,
link=entry.link, title=entry.title,
author=entry.author, updated=entry.updated,
updated_str=self._date_to_str(entry.updated),
content=entry.content), 'UTF-8')
def _date_to_str(self, timestamp):
return str(datetime.datetime.fromtimestamp(timestamp))
def main():
parser = argparse.ArgumentParser(description='Feed parser/aggregator')
parser.add_argument('config', metavar='CONFIG', type=str,
help='Configuration file')
args = parser.parse_args()
cfg = yaml.load(open(args.config,'r'))
logging.basicConfig(level=logging.DEBUG)
ioloop = IOLoop.current()
ioloop.add_callback(run, cfg)
ioloop.start()
def run(cfg):
fetcher = FeedFetcher(cache=cfg.get('cache'))
for source in cfg['sources']:
fetcher.fetch(**source)
html_templates = cfg.get('html_templates',{})
output = cfg.get('output',{})
meta = cfg.get('meta', {})
def emit(entries):
try:
emitter = FeedEmitter(entries,
html_entry=html_templates.get('entry'),
html_base=html_templates.get('base'))
if output.get('html'):
html = emitter.make_html(**meta)
open(output['html'],'wb').write(html)
if output.get('rss'):
rss = emitter.make_rss(**meta)
open(output['rss'],'w').write(rss)
finally:
IOLoop.current().stop()
fetcher.collate(emit)
if __name__ == '__main__':
main()