Mercurial > hg > index.fcgi > www > www-1

annotate myrss/myrss_app.py @ 76:51f0da3da721

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myrss: fix Atom link parsing
author paulo
date Thu, 12 May 2016 01:04:10 -0700
parents d6acf8b093b7
children 583400dc28a0
rev   line source
paulo@39 1 import os
paulo@40 2 import sys
paulo@39 3 import re
paulo@40 4 import urllib2
paulo@40 5 import threading
paulo@40 6 import Queue
paulo@41 7 import datetime
paulo@41 8 import time
paulo@70 9 import traceback
paulo@47 10
paulo@42 11 import logging
paulo@68 12 logging.basicConfig(
paulo@70 13 #level=logging.DEBUG,
paulo@68 14 #filename="_LOG",
paulo@68 15 #format="%(asctime)s %(levelname)-8s %(message)s",
paulo@68 16 )
paulo@39 17
paulo@47 18 import xml.etree.ElementTree
paulo@47 19 import HTMLParser
paulo@47 20
paulo@39 21 import html
paulo@39 22
paulo@39 23
paulo@41 24 FEEDS_FILE = "FEEDS"
paulo@41 25 CACHE_HTML_FILE = "__cache__.html"
paulo@41 26
paulo@44 27 CACHE_LIFE = 1200 # [seconds]
paulo@47 28 MAX_ITEMS = 50
paulo@39 29 MAX_LINK_Z = 4
paulo@40 30 MAX_THREADS = 20
paulo@46 31 URLOPEN_TIMEOUT = 60 # [seconds]
paulo@39 32
paulo@39 33
paulo@39 34 _PARSE_ROOT_TAG_RE = re.compile(r"(\{(.+)\})?(.+)")
paulo@39 35
paulo@39 36 def _parse_root_tag(root_tag):
paulo@39 37 re_match = _PARSE_ROOT_TAG_RE.match(root_tag)
paulo@39 38
paulo@39 39 if re_match is None:
paulo@39 40 return (None, None)
paulo@39 41 else:
paulo@39 42 return re_match.group(2, 3)
paulo@39 43
paulo@39 44
paulo@47 45 def _strip_if_not_none(txt):
paulo@47 46 return txt.strip() if txt is not None else ''
paulo@47 47
paulo@47 48
paulo@39 49 def _go_rss(elementTree):
paulo@47 50 title = _strip_if_not_none(elementTree.find("channel/title").text)
paulo@39 51 link = elementTree.find("channel/link").text
paulo@39 52
paulo@39 53 items = []
paulo@39 54
paulo@39 55 for i in elementTree.findall("channel/item")[:MAX_ITEMS]:
paulo@47 56 it_title = _strip_if_not_none(i.find("title").text)
paulo@39 57 it_link = i.find("link").text
paulo@39 58
paulo@39 59 items.append((it_title, it_link))
paulo@39 60
paulo@39 61 return (title, link, items)
paulo@39 62
paulo@39 63
paulo@39 64 def _go_atom(elementTree):
paulo@39 65 ns = "http://www.w3.org/2005/Atom"
paulo@39 66
paulo@47 67 title = _strip_if_not_none(elementTree.find("{%s}title" % ns).text)
paulo@39 68 link = ''
paulo@39 69
paulo@76 70 links = elementTree.findall("{%s}link" % ns)
paulo@76 71 for i in links:
paulo@76 72 if len(links) == 1 or i.get("rel") == "alternate":
paulo@39 73 link = i.get("href")
paulo@39 74 break
paulo@39 75
paulo@39 76 items = []
paulo@39 77
paulo@39 78 for i in elementTree.findall("{%s}entry" % ns)[:MAX_ITEMS]:
paulo@47 79 it_title = _strip_if_not_none(i.find("{%s}title" % ns).text)
paulo@39 80 it_link = ''
paulo@39 81
paulo@76 82 it_links = i.findall("{%s}link" % ns)
paulo@76 83 for j in it_links:
paulo@76 84 if len(it_links) == 1 or j.get("rel") == "alternate":
paulo@39 85 it_link = j.get("href")
paulo@39 86 break
paulo@39 87
paulo@39 88 items.append((it_title, it_link))
paulo@39 89
paulo@39 90 return (title, link, items)
paulo@39 91
paulo@39 92
paulo@69 93 def _go_purl_rss(elementTree):
paulo@69 94 ns = "http://purl.org/rss/1.0/"
paulo@69 95
paulo@69 96 title = _strip_if_not_none(elementTree.find("{%s}channel/{%s}title" % (ns, ns)).text)
paulo@69 97 link = elementTree.find("{%s}channel/{%s}link" % (ns, ns)).text
paulo@69 98
paulo@69 99 items = []
paulo@69 100
paulo@69 101 for i in elementTree.findall("{%s}item" % ns)[:MAX_ITEMS]:
paulo@69 102 it_title = _strip_if_not_none(i.find("{%s}title" % ns).text)
paulo@69 103 it_link = i.find("{%s}link" % ns).text
paulo@69 104
paulo@69 105 items.append((it_title, it_link))
paulo@69 106
paulo@69 107 return (title, link, items)
paulo@69 108
paulo@69 109
paulo@47 110 _STRIP_HTML_RE = re.compile(r"<.*?>")
paulo@47 111 _htmlParser = HTMLParser.HTMLParser()
paulo@47 112
paulo@47 113 def _strip_html(txt):
paulo@47 114 return _htmlParser.unescape(_STRIP_HTML_RE.sub('', txt))
paulo@47 115
paulo@47 116
paulo@41 117 def _to_html(dtnow, docstruct):
paulo@41 118 datetime_str = dtnow.strftime("%Y-%m-%d %H:%M %Z")
paulo@41 119 page_title = "myrss -- %s" % datetime_str
paulo@41 120
paulo@42 121 root = html.HTML("html")
paulo@39 122
paulo@39 123 header = root.header
paulo@41 124 header.title(page_title)
paulo@39 125 header.link(rel="stylesheet", type="text/css", href="index.css")
paulo@39 126
paulo@41 127 body = root.body
paulo@41 128 body.h1(page_title)
paulo@41 129
paulo@39 130 link_z = 0
paulo@39 131
paulo@39 132 for feed in docstruct:
paulo@40 133 if feed is None:
paulo@40 134 continue
paulo@40 135
paulo@39 136 (title, link, items) = feed
paulo@39 137
paulo@47 138 body.h2.a(_strip_html(title), href=link, klass="z%d" % (link_z % MAX_LINK_Z))
paulo@39 139 link_z += 1
paulo@41 140 p = body.p
paulo@39 141
paulo@39 142 for (i, (it_title, it_link)) in enumerate(items):
paulo@39 143 if i > 0:
paulo@39 144 p += " - "
paulo@39 145
paulo@72 146 if not it_title:
paulo@72 147 it_title = "(missing title)"
paulo@72 148 if it_link is not None:
paulo@72 149 p.a(_strip_html(it_title), href=it_link, klass="z%d" % (link_z % MAX_LINK_Z))
paulo@72 150 else:
paulo@72 151 p += _strip_html(it_title)
paulo@72 152
paulo@39 153 link_z += 1
paulo@39 154
paulo@46 155 dtdelta = datetime.datetime.now() - dtnow
paulo@46 156 root.div("%.3f" % (dtdelta.days*86400 + dtdelta.seconds + dtdelta.microseconds/1e6), klass="debug")
paulo@46 157
paulo@39 158 return unicode(root).encode("utf-8")
paulo@39 159
paulo@39 160
paulo@47 161 def _fetch_url(url):
paulo@40 162 try:
paulo@42 163 logging.info("processing %s" % url)
paulo@74 164 feed = urllib2.urlopen(urllib2.Request(url, headers={"User-Agent": "Mozilla/5.0"}), timeout=URLOPEN_TIMEOUT)
paulo@40 165 except urllib2.HTTPError as e:
paulo@42 166 logging.info("(%s) %s" % (url, e))
paulo@47 167 return None
paulo@47 168
paulo@47 169 return feed
paulo@47 170
paulo@47 171
paulo@47 172 def _process_feed(feed):
paulo@47 173 ret = None
paulo@40 174
paulo@40 175 elementTree = xml.etree.ElementTree.parse(feed)
paulo@40 176 root = elementTree.getroot()
paulo@40 177
paulo@40 178 parsed_root_tag = _parse_root_tag(root.tag)
paulo@40 179
paulo@40 180 if parsed_root_tag == (None, "rss"):
paulo@40 181 version = float(root.get("version", 0.0))
paulo@40 182 if version >= 2.0:
paulo@40 183 ret = _go_rss(elementTree)
paulo@40 184 else:
paulo@40 185 raise NotImplementedError("Unsupported rss version")
paulo@40 186 elif parsed_root_tag == ("http://www.w3.org/2005/Atom", "feed"):
paulo@40 187 ret = _go_atom(elementTree)
paulo@69 188 elif parsed_root_tag == ("http://www.w3.org/1999/02/22-rdf-syntax-ns#", "RDF"):
paulo@69 189 ret = _go_purl_rss(elementTree)
paulo@40 190 else:
paulo@40 191 raise NotImplementedError("Unknown root tag")
paulo@40 192
paulo@40 193 return ret
paulo@40 194
paulo@40 195
paulo@40 196 class WorkerThread(threading.Thread):
paulo@40 197 def __init__(self, *args, **kwargs):
paulo@40 198 self._input_queue = kwargs.pop("input_queue")
paulo@40 199 self._output_queue = kwargs.pop("output_queue")
paulo@40 200 threading.Thread.__init__(self, *args, **kwargs)
paulo@40 201 self.daemon = True
paulo@40 202
paulo@40 203 def run(self):
paulo@40 204 while True:
paulo@40 205 (idx, url) = self._input_queue.get()
paulo@40 206 docfeed = None
paulo@40 207 try:
paulo@47 208 feed = _fetch_url(url)
paulo@47 209 if feed is not None:
paulo@47 210 docfeed = _process_feed(feed)
paulo@40 211 except Exception as e:
paulo@42 212 logging.info("(%s) exception: %s" % (url, e))
paulo@40 213 self._output_queue.put((idx, docfeed))
paulo@40 214
paulo@40 215
paulo@44 216 def main(input_queue, output_queue, lock):
paulo@41 217 ret = ''
paulo@41 218
paulo@44 219 with lock:
paulo@44 220 epoch_now = time.time()
paulo@44 221 dtnow = datetime.datetime.fromtimestamp(epoch_now)
paulo@41 222
paulo@44 223 if os.path.exists(CACHE_HTML_FILE) and (epoch_now - os.stat(CACHE_HTML_FILE).st_mtime) < float(CACHE_LIFE):
paulo@44 224 with open(CACHE_HTML_FILE) as cache_html_file:
paulo@44 225 ret = cache_html_file.read()
paulo@41 226
paulo@44 227 else:
paulo@44 228 with open(FEEDS_FILE) as feeds_file:
paulo@44 229 feedlines = feeds_file.readlines()
paulo@41 230
paulo@44 231 docstruct = [None]*len(feedlines)
paulo@44 232 num_input = 0
paulo@44 233 for (i, l) in enumerate(feedlines):
paulo@44 234 if l[0] != '#':
paulo@44 235 l = l.strip()
paulo@44 236 input_queue.put((i, l))
paulo@44 237 num_input += 1
paulo@41 238
paulo@44 239 for _ in range(num_input):
paulo@44 240 (idx, docfeed) = output_queue.get()
paulo@44 241 docstruct[idx] = docfeed
paulo@41 242
paulo@44 243 ret = _to_html(dtnow, docstruct)
paulo@41 244
paulo@44 245 with open(CACHE_HTML_FILE, 'w') as cache_html_file:
paulo@44 246 cache_html_file.write(ret)
paulo@41 247
paulo@41 248 return ret
paulo@41 249
paulo@41 250
paulo@42 251 class MyRssApp:
paulo@42 252 def __init__(self):
paulo@42 253 self._iq = Queue.Queue(MAX_THREADS)
paulo@42 254 self._oq = Queue.Queue(MAX_THREADS)
paulo@44 255 self._main_lock = threading.Lock()
paulo@39 256
paulo@42 257 for _ in range(MAX_THREADS):
paulo@42 258 WorkerThread(input_queue=self._iq, output_queue=self._oq).start()
paulo@42 259
paulo@42 260 def __call__(self, environ, start_response):
paulo@70 261 response_code = "500 Internal Server Error"
paulo@70 262 response_type = "text/plain; charset=UTF-8"
paulo@70 263
paulo@70 264 try:
paulo@70 265 response_body = main(self._iq, self._oq, self._main_lock)
paulo@70 266 response_code = "200 OK"
paulo@70 267 response_type = "text/html; charset=UTF-8"
paulo@70 268 except:
paulo@70 269 response_body = traceback.format_exc()
paulo@70 270
paulo@42 271 response_headers = [
paulo@70 272 ("Content-Type", response_type),
paulo@42 273 ("Content-Length", str(len(response_body))),
paulo@42 274 ]
paulo@70 275 start_response(response_code, response_headers)
paulo@42 276
paulo@42 277 return [response_body]