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genservernews.py
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genservernews.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import xml
import xml.dom
import xml.dom.minidom
import requests
import signal
import syslog
import logging
"""
Generate HTML Fragment about latest server news.
"""
SERVERNEWS_FEED = "https://servers.blog.ustc.edu.cn/category/mirrors/feed/"
SERVERNEWS_MAX_NUM = 3
def getServerNews(glob_logger: logging.Logger = None) -> list:
"""
return list of NewRecord object.
Timeout is set to 20 seconds.
"""
logger = glob_logger if glob_logger else logger.getLogger()
class AlarmTimeoutException(Exception):
pass
class BadRequestException(Exception):
pass
def alarm_handler(signum, frame):
raise AlarmTimeoutException
def parseFeedData(text):
"""
Will return proper HTML String by input.
"""
class NewsRecord():
def __init__(self, item):
"""Only The most useful data are picked for now."""
self.title = item.getElementsByTagName('title')[0].firstChild.nodeValue
self.link = item.getElementsByTagName('link')[0].firstChild.nodeValue
# impl = xml.dom.getDOMImplementation() # Not needed in parsing
doc = xml.dom.minidom.parseString(text)
for item in doc.getElementsByTagName('item')[:SERVERNEWS_MAX_NUM]:
yield NewsRecord(item)
logger.info('begin generation of ServerNews...')
newslist = []
signal.signal(signal.SIGALRM, alarm_handler)
signal.alarm(20)
try:
page = requests.get(SERVERNEWS_FEED)
if page.status_code != 200:
raise BadRequestException
newslist = list(parseFeedData(page.text))
except AlarmTimeoutException:
logger.error('generation of ServerNews timed out')
except BadRequestException:
logger.error('failed to retrieve data from servers.blog')
except Exception as e:
logger.error('unknown exception caught: "{}".'.format(str(e)))
finally:
signal.alarm(0)
signal.signal(signal.SIGALRM, signal.SIG_DFL)
logger.info('newslist generation successful, size is {}.'.format(len(newslist)))
return newslist
if __name__ == "__main__":
for i in getServerNews():
print(i.title, i.link)
# vim: set ts=8 sw=4 tw=0 et :