paulo@39: import os
paulo@40: import sys
paulo@39: import re
paulo@40: import urllib2
paulo@40: import threading
paulo@40: import Queue
paulo@41: import datetime
paulo@41: import time
paulo@70: import traceback
paulo@47: 
paulo@42: import logging
paulo@94: #logging.basicConfig(
paulo@94: #	level=logging.DEBUG,
paulo@94: #	filename="_LOG",
paulo@94: #	format="%(asctime)s %(levelname)-8s %(message)s",
paulo@94: #)
paulo@39: 
paulo@47: import xml.etree.ElementTree 
paulo@47: import HTMLParser
paulo@47: 
paulo@39: import html
paulo@39: 
paulo@39: 
paulo@41: FEEDS_FILE = "FEEDS"
paulo@41: CACHE_HTML_FILE = "__cache__.html"
paulo@41: 
paulo@44: CACHE_LIFE = 1200 # [seconds]
paulo@47: MAX_ITEMS = 50
paulo@39: MAX_LINK_Z = 4
paulo@40: MAX_THREADS = 20
paulo@46: URLOPEN_TIMEOUT = 60 # [seconds]
paulo@39: 
paulo@39: 
paulo@39: _PARSE_ROOT_TAG_RE = re.compile(r"(\{(.+)\})?(.+)")
paulo@39: 
paulo@39: def _parse_root_tag(root_tag):
paulo@39: 	re_match = _PARSE_ROOT_TAG_RE.match(root_tag)
paulo@39: 
paulo@39: 	if re_match is None:
paulo@39: 		return (None, None)
paulo@39: 	else:
paulo@39: 		return re_match.group(2, 3)
paulo@39: 	
paulo@39: 
paulo@47: def _strip_if_not_none(txt):
paulo@47: 	return txt.strip() if txt is not None else ''
paulo@47: 
paulo@47: 
paulo@39: def _go_rss(elementTree):
paulo@47: 	title = _strip_if_not_none(elementTree.find("channel/title").text)
paulo@39: 	link = elementTree.find("channel/link").text
paulo@39: 
paulo@39: 	items = []
paulo@39: 
paulo@39: 	for i in elementTree.findall("channel/item")[:MAX_ITEMS]:
paulo@47: 		it_title = _strip_if_not_none(i.find("title").text)
paulo@39: 		it_link = i.find("link").text
paulo@39: 
paulo@39: 		items.append((it_title, it_link))
paulo@39: 
paulo@39: 	return (title, link, items)
paulo@39: 
paulo@39: 
paulo@39: def _go_atom(elementTree):
paulo@39: 	ns = "http://www.w3.org/2005/Atom"
paulo@39: 
paulo@47: 	title = _strip_if_not_none(elementTree.find("{%s}title" % ns).text)
paulo@39: 	link = ''
paulo@39: 
paulo@76: 	links = elementTree.findall("{%s}link" % ns)
paulo@76: 	for i in links:
paulo@76: 		if len(links) == 1 or i.get("rel") == "alternate":
paulo@39: 			link = i.get("href")
paulo@39: 			break
paulo@39: 
paulo@39: 	items = []
paulo@39: 
paulo@39: 	for i in elementTree.findall("{%s}entry" % ns)[:MAX_ITEMS]:
paulo@47: 		it_title = _strip_if_not_none(i.find("{%s}title" % ns).text)
paulo@39: 		it_link = ''
paulo@39: 		
paulo@76: 		it_links = i.findall("{%s}link" % ns)
paulo@76: 		for j in it_links:
paulo@76: 			if len(it_links) == 1 or j.get("rel") == "alternate":
paulo@39: 				it_link = j.get("href")
paulo@39: 				break
paulo@39: 
paulo@39: 		items.append((it_title, it_link))
paulo@39: 
paulo@39: 	return (title, link, items)
paulo@39: 
paulo@39: 
paulo@69: def _go_purl_rss(elementTree):
paulo@69: 	ns = "http://purl.org/rss/1.0/"
paulo@69: 
paulo@69: 	title = _strip_if_not_none(elementTree.find("{%s}channel/{%s}title" % (ns, ns)).text)
paulo@69: 	link = elementTree.find("{%s}channel/{%s}link" % (ns, ns)).text
paulo@69: 
paulo@69: 	items = []
paulo@69: 
paulo@69: 	for i in elementTree.findall("{%s}item" % ns)[:MAX_ITEMS]:
paulo@69: 		it_title = _strip_if_not_none(i.find("{%s}title" % ns).text)
paulo@69: 		it_link = i.find("{%s}link" % ns).text
paulo@69: 
paulo@69: 		items.append((it_title, it_link))
paulo@69: 
paulo@69: 	return (title, link, items)
paulo@69: 
paulo@69: 
paulo@47: _STRIP_HTML_RE = re.compile(r"<.*?>")
paulo@47: _htmlParser = HTMLParser.HTMLParser()
paulo@47: 
paulo@47: def _strip_html(txt):
paulo@47: 	return _htmlParser.unescape(_STRIP_HTML_RE.sub('', txt))
paulo@47: 	
paulo@47: 
paulo@41: def _to_html(dtnow, docstruct):
paulo@41: 	datetime_str = dtnow.strftime("%Y-%m-%d %H:%M %Z")
paulo@41: 	page_title = "myrss -- %s" % datetime_str
paulo@41: 
paulo@42: 	root = html.HTML("html")
paulo@39: 
paulo@96: 	header = root.head
paulo@41: 	header.title(page_title)
paulo@39: 	header.link(rel="stylesheet", type="text/css", href="index.css")
paulo@39: 
paulo@41: 	body = root.body
paulo@41: 	body.h1(page_title)
paulo@41: 
paulo@39: 	link_z = 0
paulo@39: 
paulo@39: 	for feed in docstruct:
paulo@40: 		if feed is None:
paulo@40: 			continue
paulo@40: 
paulo@39: 		(title, link, items) = feed
paulo@39: 
paulo@47: 		body.h2.a(_strip_html(title), href=link, klass="z%d" % (link_z % MAX_LINK_Z))
paulo@39: 		link_z += 1
paulo@41: 		p = body.p
paulo@39: 
paulo@39: 		for (i, (it_title, it_link)) in enumerate(items):
paulo@39: 			if i > 0:
paulo@39: 				p += " - "
paulo@39: 
paulo@72: 			if not it_title:
paulo@72: 				it_title = "(missing title)"
paulo@72: 			if it_link is not None:
paulo@72: 				p.a(_strip_html(it_title), href=it_link, klass="z%d" % (link_z % MAX_LINK_Z))
paulo@72: 			else:
paulo@72: 				p += _strip_html(it_title)
paulo@72:         
paulo@39: 			link_z += 1
paulo@39: 
paulo@46: 	dtdelta = datetime.datetime.now() - dtnow
paulo@46: 	root.div("%.3f" % (dtdelta.days*86400 + dtdelta.seconds + dtdelta.microseconds/1e6), klass="debug")
paulo@46: 
paulo@39: 	return unicode(root).encode("utf-8")
paulo@39: 
paulo@39: 
paulo@47: def _fetch_url(url):
paulo@40: 	try:
paulo@42: 		logging.info("processing %s" % url)
paulo@88: 		feed = urllib2.urlopen(urllib2.Request(url, headers={"User-Agent": "Mozilla/5.0 Browser"}), timeout=URLOPEN_TIMEOUT)
paulo@40: 	except urllib2.HTTPError as e:
paulo@42: 		logging.info("(%s) %s" % (url, e))
paulo@47: 		return None
paulo@47: 
paulo@47: 	return feed
paulo@47: 
paulo@47: 
paulo@47: def _process_feed(feed):
paulo@47: 	ret = None
paulo@40: 
paulo@40: 	elementTree = xml.etree.ElementTree.parse(feed)
paulo@40: 	root = elementTree.getroot()
paulo@40: 
paulo@40: 	parsed_root_tag = _parse_root_tag(root.tag) 
paulo@40: 
paulo@40: 	if parsed_root_tag == (None, "rss"):
paulo@40: 		version = float(root.get("version", 0.0))
paulo@40: 		if version >= 2.0:
paulo@40: 			ret = _go_rss(elementTree)
paulo@40: 		else:
paulo@40: 			raise NotImplementedError("Unsupported rss version")
paulo@40: 	elif parsed_root_tag == ("http://www.w3.org/2005/Atom", "feed"):
paulo@40: 		ret = _go_atom(elementTree)
paulo@69: 	elif parsed_root_tag == ("http://www.w3.org/1999/02/22-rdf-syntax-ns#", "RDF"):
paulo@69: 		ret = _go_purl_rss(elementTree)
paulo@40: 	else:
paulo@40: 		raise NotImplementedError("Unknown root tag")
paulo@40: 
paulo@40: 	return ret
paulo@40: 
paulo@40: 
paulo@40: class WorkerThread(threading.Thread):
paulo@40: 	def __init__(self, *args, **kwargs):
paulo@40: 		self._input_queue = kwargs.pop("input_queue")
paulo@40: 		self._output_queue = kwargs.pop("output_queue")
paulo@40: 		threading.Thread.__init__(self, *args, **kwargs)
paulo@40: 		self.daemon = True
paulo@40: 
paulo@40: 	def run(self):
paulo@40: 		while True:
paulo@40: 			(idx, url) = self._input_queue.get()
paulo@40: 			docfeed = None
paulo@40: 			try:
paulo@47: 				feed = _fetch_url(url)
paulo@47: 				if feed is not None:
paulo@47: 					docfeed = _process_feed(feed)
paulo@40: 			except Exception as e:
paulo@88: 				logging.info("(%s) exception: (%s) %s" % (url, type(e), e))
paulo@40: 			self._output_queue.put((idx, docfeed))
paulo@40: 			
paulo@40: 
paulo@44: def main(input_queue, output_queue, lock):
paulo@41: 	ret = ''
paulo@41: 
paulo@44: 	with lock:
paulo@94: 		logging.debug("main() started")
paulo@44: 		epoch_now = time.time()
paulo@44: 		dtnow = datetime.datetime.fromtimestamp(epoch_now)
paulo@41: 
paulo@44: 		if os.path.exists(CACHE_HTML_FILE) and (epoch_now - os.stat(CACHE_HTML_FILE).st_mtime) < float(CACHE_LIFE):
paulo@44: 			with open(CACHE_HTML_FILE) as cache_html_file:
paulo@44: 				ret = cache_html_file.read()
paulo@41: 
paulo@44: 		else:
paulo@44: 			with open(FEEDS_FILE) as feeds_file:
paulo@44: 				feedlines = feeds_file.readlines()
paulo@41: 
paulo@44: 			docstruct = [None]*len(feedlines)
paulo@44: 			num_input = 0
paulo@44: 			for (i, l) in enumerate(feedlines):
paulo@44: 				if l[0] != '#':
paulo@44: 					l = l.strip()
paulo@44: 					input_queue.put((i, l))
paulo@44: 					num_input += 1
paulo@41: 
paulo@44: 			for _ in range(num_input):
paulo@44: 				(idx, docfeed) = output_queue.get()
paulo@44: 				docstruct[idx] = docfeed
paulo@41: 
paulo@44: 			ret = _to_html(dtnow, docstruct)
paulo@41: 
paulo@44: 			with open(CACHE_HTML_FILE, 'w') as cache_html_file:
paulo@44: 				cache_html_file.write(ret)
paulo@41: 
paulo@41: 	return ret
paulo@41: 
paulo@41: 
paulo@42: class MyRssApp:
paulo@42: 	def __init__(self):
paulo@94: 		logging.debug("MyRssApp.__init__() called")
paulo@42: 		self._iq = Queue.Queue(MAX_THREADS)
paulo@42: 		self._oq = Queue.Queue(MAX_THREADS)
paulo@44: 		self._main_lock = threading.Lock()
paulo@39: 
paulo@94: 		for i in range(MAX_THREADS):
paulo@94: 			logging.debug("Starting thread: %d" % i)
paulo@42: 			WorkerThread(input_queue=self._iq, output_queue=self._oq).start()
paulo@42: 
paulo@42: 	def __call__(self, environ, start_response):
paulo@70: 		response_code = "500 Internal Server Error"
paulo@70: 		response_type = "text/plain; charset=UTF-8"
paulo@70: 
paulo@70: 		try:
paulo@70: 			response_body = main(self._iq, self._oq, self._main_lock)
paulo@70: 			response_code = "200 OK"
paulo@70: 			response_type = "text/html; charset=UTF-8"
paulo@70: 		except:
paulo@70: 			response_body = traceback.format_exc()
paulo@70: 
paulo@42: 		response_headers = [
paulo@70: 			("Content-Type", response_type),
paulo@42: 			("Content-Length", str(len(response_body))),
paulo@42: 		]
paulo@70: 		start_response(response_code, response_headers)
paulo@42: 
paulo@42: 		return [response_body]