我正在尝试找出Task Queue和Channel API。
当用户提交表单时,我有一个预计会在任务队列中运行> 60秒的进程。然后,此过程应在执行时通过通道api发送消息。粗糙我似乎无法使这项工作。任何人都可以告诉我为什么SendMessagesHandler
无法向客户端发送消息javascript?或者也许客户端javascript没有正确收到?此外,我在日志控制台中看不到来自logging
的{{1}}消息,它只显示了工厂SendMessagesHandler
或INFO ... GET
的运行情况。在我写这篇文章时,我意识到我必须在这里遇到一个以上的问题,任务确实在任务队列中创建,我可以在SDK控制台中看到它,但它似乎只是继续无休止地运行,我希望它运行大约1m2sec。如果我从POST
中取出sleep
命令,它会快速运行,甚至可以在SDK控制台中捕获它。
提前感谢您的帮助。
这是main.py文件:
SendMessageHandler
这是template.html
#!/usr/bin/env python
import webapp2
import os
import jinja2
import logging
from time import sleep
from google.appengine.api import taskqueue, users, channel
from google.appengine.ext import db
class MainHandler(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user:
key = self.request.get('key')
if not key:
key = user.user_id()
key_link = 'http://localhost:8080/?key=' + key
token = channel.create_channel(key)
template_values = {'token': token,
'me': user.user_id(),
'key': key,
'key_link': key_link,
'initial_message': 'Nothing to show yet'}
template = jinja_environment.get_template('template.html')
self.response.out.write(template.render(template_values))
else:
self.redirect(users.create_login_url(self.request.uri))
def post(self):
key = self.request.get('key')
taskqueue.add(url='/sendmessages', params={'key': key})
self.redirect('/')
class SendMessagesHandler(webapp2.RequestHandler):
def post(self):
key = self.request.get('key')
sleep(2)
channel.send_message(key, 'Starting to send messages...')
logging.info('Starting to send messages...')
i = 0
while i < 60:
i += 1
logging.info('Counter incremented.')
channel.send_message(key, 'Counter incemented.')
sleep(1)
jinja_environment = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)))
app = webapp2.WSGIApplication([
('/', MainHandler),
('/sendmessages', SendMessagesHandler)
], debug=True)
以下是浏览器的视图来源:
<html>
<head>
<title>Simple Task Queue Channel API</title>
<script src='/_ah/channel/jsapi'></script>
</head>
<body>
<script type='text/jacascript'>
onOpened = function() {};
onMessage = function(message) {
var messageBox = document.getElementById("messageBox");
messageBox.innerHTML = message;
};
onError = function() {};
onClose = function() {};
channel = new goog.appengine.Channel('{{token}}');
socket = channel.open();
socket.onopen = onOpened;
socket.onmessage = onMessage;
socket.onerror = onError;
socket.onclose = onClose;
</script>
<form method="post" action="/">
<input type="text" name="key" value="{{ key }}">
<input type="submit" name="submit" value="Receive Messages">
</form>
<div id="messageBox"><!-- message should go in here --></div>
</body>
</html>
答案 0 :(得分:1)
我发现至少两个错误:
第一
<script type='text/javascript'>
第二
onMessage = function(message) {
var messageBox = document.getElementById("messageBox");
messageBox.innerHTML = message.data;
};