Question

我在Google Appengine中有一个脚本，由cron.yaml每20分钟启动一次。这在我自己的机器上本地工作。当我（手动）转到在线启动脚本的URL时，它也可以工作。但是，当cron.yaml负责启动脚本时，在Google的实例上，脚本始终无法在线完成。

日志显示没有错误，只显示2条调试消息：

D 2013-07-23 06:00:08.449
type(soup): <class 'bs4.BeautifulSoup'> END type(soup)

D 2013-07-23 06:00:11.246
type(soup): <class 'bs4.BeautifulSoup'> END type(soup)

这是我的剧本：

# coding: utf-8
import jinja2, webapp2, urllib2, re

from bs4 import BeautifulSoup as bs
from google.appengine.api import memcache
from google.appengine.ext import db

class Article(db.Model):
    content = db.TextProperty()
    datetime = db.DateTimeProperty(auto_now_add=True)
    companies = db.ListProperty(db.Key)
    url = db.StringProperty()

class Company(db.Model):
    name = db.StringProperty() 
    ticker = db.StringProperty()

    @property
    def articles(self):
        return Article.gql("WHERE companies = :1", self.key()) 

def companies_key(companies_name=None):
  return db.Key.from_path('Companies', companies_name or 'default_companies')

def articles_key(articles_name=None):
  return db.Key.from_path('Articles', articles_name or 'default_articles')

def scrape():
   companies = memcache.get("companies")
   if not companies:
      companies = Company.all()
      memcache.add("companies",companies,30)
   for company in companies:
      links = links(company.ticker)
      links = set(links)
      for link in links:
          if link is not "None": 
              article_object = Article() 
              text = fetch(link)            
              article_object.content = text
              article_object.url = link
              article_object.companies.append(company.key()) #doesn't work.
              article_object.put()

def fetch(link):
    try:
        html = urllib2.urlopen(url).read()
        soup = bs(html)
    except:
        return "None"
    text = soup.get_text()
    text = text.encode('utf-8')
    text = text.decode('utf-8')
    text = unicode(text)
    if text is not "None": 
        return text
    else: 
        return "None"


def links(ticker):
    url = "https://www.google.com/finance/company_news?q=NASDAQ:" + ticker + "&start=10&num=10"
    html = urllib2.urlopen(url).read()
    soup = bs(html)
    div_class = re.compile("^g-section.*")
    divs = soup.find_all("div", {"class" : div_class})
    links = []
    for div in divs:
        a = unicode(div.find('a', attrs={'href': re.compile("^http://")})) 
        link_regex = re.search("(http://.*?)\"",a)
        try:
            link = link_regex.group(1)
            soup = bs(link)
            link = soup.get_text() 
        except:
            link = "None"
        links.append(link)

    return links

...和main中的脚本处理程序：

class ScrapeHandler(webapp2.RequestHandler):
    def get(self):
        scrape.scrape()
        self.redirect("/")

我的猜测是问题可能是scrape脚本中的双循环，但我不明白为什么。

更新文章确实被删除（尽可能多），现在根本没有日志错误，甚至根本没有调试消息。看着日志，cron的工作似乎完美无缺。尽管如此，Appengine的cron工作小组表示，cron工作失败了。

Answer 1

我，我很确定这个错误是由于DeadlineExceededError引起的，我没有在本地遇到过。我的scrape（）脚本现在可以在更少的公司和文章上做到，并且不会遇到超出的截止日期。

cron job在gae python失败了

1 个答案: