我非常接近完成一个项目，该项目在GAE中使用推送任务队列向用户发送后续电子邮件。但是，我一直得到一个KeyError，不知道为什么。我一直在寻找基于我的项目的好模型，但没有找到任何使用多个参数的体面示例。 GAE文档在上个月有所改进，但仍有许多不足之处。
我使用开发服务器中的交互式控制台检查了许多代码，但我仍然不知道我做错了什么。我最好的猜测是参数不会传递到脚本的下一部分（类pushQueue）。
的app.yaml：
application: gae-project
version: 1
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /cron/sendfu
script: main.app
login: admin
- url: /emailworker
script: main.app
login: admin
- url: /worker
script: main.app
login: admin
- url: /.*
script: main.app
login: required
cron.yaml：
cron:
- description: sends follow-up emails
url: /cron/sendfu
schedule: every day 20:00
queue.yaml中：
total_storage_limit: 120M
queue:
- name: emailworker
rate: 1/s
bucket_size: 50
retry_parameters:
task_retry_limit: 5
task_age_limit: 6h
min_backoff_seconds: 10
max_backoff_seconds: 60
main.py：
import webapp2
import datetime
from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.api import taskqueue
import jinja2
import os
jinja_environment = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)))
class emailJobs(db.Model):
""" Models an a list of email jobs for each user """
triggerid = db.StringProperty() #Trig id
recipientid_po = db.StringProperty() # id
recipientlang = db.StringProperty() #Language
fu_email_sent = db.DateTimeProperty()
fuperiod = db.IntegerProperty() # (0 - 13)
fu1 = db.DateTimeProperty()
fu2 = db.DateTimeProperty()
@classmethod
def update_fusent(cls, key_name, senddate):
""" Class method that updates fu messages sent in the GAE Datastore """
emailsjobs = cls.get_by_key_name(key_name)
if emailsjobs is None:
emailsjobs = cls(key_name=key_name)
emailsjobs.fu_email_sent = senddate
emailsjobs.put()
def timeStampFM(now):
d = now.date()
year = d.year
month = d.month
day = d.day
t = now.time()
hour = t.hour
minute = t.minute + 5
second = t.second
today_datetime = datetime.datetime(year, month, day, hour, minute, second)
return today_datetime
class MainPage(webapp2.RequestHandler):
""" Main admin login page """
def get(self):
if users.get_current_user():
url = users.create_logout_url(self.request.uri)
url_linktext = 'Logout'
urla = '/'
url_admin = ""
if users.is_current_user_admin():
url = users.create_logout_url(self.request.uri)
urla = "_ah/admin/"
url_admin = 'Go to admin pages'
url_linktext = 'Logout'
else:
url = users.create_login_url(self.request.uri)
url_linktext = 'Login'
template_values = {
'url': url,
'url_linktext': url_linktext,
'url_admin': url_admin,
'urla': urla,
}
template = jinja_environment.get_template('index.html')
self.response.out.write(template.render(template_values))
class sendFollowUp(webapp2.RequestHandler):
""" Queries Datastore for fu dates that match today's date, then adds them to a task queue """
def get(self):
now = datetime.datetime.now()
now_dt = now.date() #today's date to compare with fu dates
q = emailJobs.all()
q.filter('fuperiod >', 0)
q.filter('fuperiod <', 99)
for part in q:
guid = str(part.recipientid_po)
lang = str(part.recipientlang)
trigid = str(part.triggerid)
if part.fuperiod == 1:
fu1rawdt = part.fu1
fu1dt = fu1rawdt.date()
if fu1dt == now_dt:
follow_up = '1'
if part.fuperiod == 2:
fu2rawdt = part.fu2
fu2dt = fu2rawdt.date()
if fu2dt == now_dt:
follow_up = '2'
if follow_up != None:
taskqueue.add(queue_name='emailworker', url='/emailworker', params={'guid': guid,
'fu': follow_up,
'lang': lang,
'trigid': trigid,
})
self.redirect('/emailworker')
class pushQueue(webapp2.RequestHandler):
""" Sends fu emails, updates the Datastore with datetime sent """
def store_emails(self, trigid, senddate):
db.run_in_transaction(emailJobs.update_fusent, trigid, senddate)
def get(self):
fu_messages = {'1': 'MS_x01',
'2': 'MS_x02',
}
langs = {'EN': 'English subject',
'ES': 'Spanish subject',
}
fu = str(self.request.get('fu'))
messageid = fu_messages[fu]
lang = str(self.request.get('lang'))
subject = langs[lang]
now = datetime.datetime.now()
senddate = timeStampFM(now)
guid = str(self.request.get('guid'))
trigid = str(self.request.get('trigid'))
data = {}
data['Subject'] = subject
data['MessageID'] = messageid
data['SendDate'] = senddate
data['RecipientID'] = guid
# Here I do something with data = {}
self.store_emails(trigid, senddate)
app = webapp2.WSGIApplication([('/', MainPage),
('/cron/sendfu', sendFollowUp),
('/emailworker', pushQueue)],
debug=True)
当我测试cron作业时：localhost：8086 / cron / sendfu
重定向到：localhost：8086 / emailworker
我收到以下错误消息：
服务器出错或无法执行请求的操作。
Traceback (most recent call last):
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "/Users/me/Documents/workspace/gae-project/src/main.py", line 478, in get
messageid = fu_messages[fu]
KeyError: ''
：
INFO 2013-03-05 03:03:22,337 dev_appserver.py:3104] "GET /cron/sendfu HTTP/1.1" 302 -
ERROR 2013-03-05 03:03:22,348 webapp2.py:1552] ''
Traceback (most recent call last):
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "/Users/me/Documents/workspace/gae-project/src/main.py", line 478, in get
messageid = fu_messages[fu]
KeyError: ''
INFO 2013-03-05 03:03:22,355 dev_appserver.py:3104] "GET /emailworker HTTP/1.1" 500 -
INFO 2013-03-05 03:03:22,509 dev_appserver.py:3104] "GET /favicon.ico HTTP/1.1" 404 -
行：
469 def get(self):
470 fu_messages = {'1': 'MS_x01',
471 '2': 'MS_x02',
472 }
473 langs = {'EN': 'English subject',
474 'ES': 'Spanish subject',
475 }
476
477 fu = str(self.request.get('fu'))
478 messageid = fu_messages[fu]
答案 0 :(得分：2)
致电时
fu = str(self.request.get('fu'))
如果请求中没有'fu'，self.request.get将返回空字符串（''）。所以当你尝试
messageid = fu_messages[fu]
它在
中查找空字符串fu_messages = {'1': 'MS_x01',
'2': 'MS_x02',
}
只有'1'和'2'作为键。
您的pushQueue处理程序未看到您通过
params的原因
params = {
'guid': guid,
'fu': follow_up,
'lang': lang,
'trigid': trigid,
}
taskqueue.add(queue_name='emailworker', url='/emailworker',
params=params)
是因为您使用GET处理程序而不是POST或PUT处理程序。正如documentation所述：
参数编码为
application/x-www-form-urlencoded并设置为 有效载荷。
因此请求的有效负载中包含'fu'个参数，但由于它是GET请求，因此有效负载被丢弃（这是HTTP工作的方式，不是特定于App Engine）。如果您使用POST作为处理程序，则有效负载将按预期进行。
我注意到您的代码与documented sample非常相似，但只使用get，其中示例使用post。