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#!/usr/bin/env python
"""PostgreSQL Planet Aggregator
This file contains the functions to generate output RSS and
HTML data from what's currently in the database.
Copyright (C) 2008 PostgreSQL Global Development Group
"""
import psycopg2
import PyRSS2Gen
import datetime
import sys
import tidy
import urllib
from HTMLParser import HTMLParser
from planethtml import PlanetHtml
class Generator:
def __init__(self,db):
self.db = db
self.tidyopts = dict( drop_proprietary_attributes=1,
alt_text='',
hide_comments=1,
output_xhtml=1,
show_body_only=1,
clean=1,
)
def Generate(self):
rss = PyRSS2Gen.RSS2(
title = 'Planet PostgreSQL',
link = 'http://planet.postgresql.org',
description = 'Planet PostgreSQL',
generator = 'Planet PostgreSQL',
lastBuildDate = datetime.datetime.utcnow())
html = PlanetHtml()
c = self.db.cursor()
c.execute("SET TIMEZONE=GMT")
c.execute("SELECT guid,link,dat,title,txt,name,blogurl,guidisperma FROM planet.posts INNER JOIN planet.feeds ON planet.feeds.id=planet.posts.feed ORDER BY dat DESC LIMIT 30")
for post in c.fetchall():
desc = self.TruncateAndCleanDescription(post[4], post[3])
rss.items.append(PyRSS2Gen.RSSItem(
title=post[5] + ': ' + post[3],
link=post[1],
guid=PyRSS2Gen.Guid(post[0],post[7]),
pubDate=post[2],
description=desc))
html.AddItem(post[0], post[1], post[2], post[3], post[5], post[6], desc)
c.execute("SELECT name,blogurl,feedurl FROM planet.feeds ORDER BY name")
for feed in c.fetchall():
html.AddFeed(feed[0], feed[1], feed[2])
rss.write_xml(open("www/rss20.xml","w"), encoding='utf-8')
html.WriteFile("www/index.html")
def TruncateAndCleanDescription(self, txt, title):
# First apply Tidy
txt = str(tidy.parseString(txt, **self.tidyopts))
# Then truncate as necessary
ht = HtmlTruncator(1024, title)
ht.feed(txt)
out = ht.GetText()
# Remove initial <br /> tags
while out.startswith('<br'):
out = out[out.find('>')+1:]
return out
class HtmlTruncator(HTMLParser):
def __init__(self, maxlen, title = None):
HTMLParser.__init__(self)
self.len = 0
self.maxlen = maxlen
self.fulltxt = ''
self.trunctxt = ''
self.tagstack = []
self.skiprest = False
self.title = title
def feed(self, txt):
txt = txt.lstrip()
self.fulltxt += txt
HTMLParser.feed(self, txt)
def handle_startendtag(self, tag, attrs):
if self.skiprest: return
self.trunctxt += self.get_starttag_text()
def quoteurl(self, str):
p = str.split(":",2)
return p[0] + ":" + urllib.quote(p[1])
def cleanhref(self, attrs):
if attrs[0] == 'href':
return 'href', self.quoteurl(attrs[1])
return attrs
def handle_starttag(self, tag, attrs):
if self.skiprest: return
self.trunctxt += "<" + tag
self.trunctxt += (' '.join([(' %s="%s"' % (k,v)) for k,v in map(self.cleanhref, attrs)]))
self.trunctxt += ">"
self.tagstack.append(tag)
def handle_endtag(self, tag):
if self.skiprest: return
self.trunctxt += "</" + tag + ">"
self.tagstack.pop()
def handle_entityref(self, ref):
self.len += 1
if self.skiprest: return
self.trunctxt += "&" + ref + ";"
def handle_data(self, data):
self.len += len(data)
if self.skiprest: return
self.trunctxt += data
if self.len > self.maxlen:
# Passed max length, so truncate text as close to the limit as possible
self.trunctxt = self.trunctxt[0:len(self.trunctxt)-(self.len-self.maxlen)]
# Now append any tags that weren't properly closed
self.tagstack.reverse()
for tag in self.tagstack:
self.trunctxt += "</" + tag + ">"
self.skiprest = True
# Finally, append the continuation chars
self.trunctxt += "[...]"
def GetText(self):
if self.len > self.maxlen:
return self.trunctxt
else:
return self.fulltxt
if __name__=="__main__":
Generator(psycopg2.connect('dbname=planetpg host=/tmp')).Generate()
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