App Engine Python开发服务器+ Taskqueue +后端 [英] App Engine Python Development Server + Taskqueue + Backend

问题描述

我在本地开发服务器上使用GAE Python 2.7。我配置了后端

 后端：
  - 名称：worker 
 class：B1 
选项：动态
  

我正在使用默认的任务队列。一切工作正常，后端和任务队列在SDK控制台中可见。此外，本地开发工作无误启动：

 多进程设置完成：
远程API服务器[http：// localhost：9200] 
 App Instance [http：// localhost：9000] 
后端实例：worker.0 [http：// localhost：9100] 
后端平衡器：worker [http：/ / localhost：9199] 
  

但是，如果我尝试通过任务解决后端问题， b
$ b

  taskqueue.add（url ='/ xyz'，method ='POST'，target ='worker'，params = {'a'：' b'}）
  

此错误提示：

 错误在队列default中发送任务task1（Url：/ backend / languages / create_database /）时发生错误。作为任务错误处理。 
 Traceback（最近一次调用最后）：
文件/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/taskqueue/taskqueue_stub .py，第1884行，在ExecuteTask 
 connection.endheaders（）
文件/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py，第937行，在endheaders中
 self._send_output（message_body）
文件/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py，第797行， in _send_output 
 self.send（msg）
文件/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py，第759行，发送
 self.connect（）
文件/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py，第740行，连接
 self .timeout，self.source_address）
文件/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py，行553，在create_connection中
用于getaddrinfo（host，port，0，SOCK_STREAM）中的res：
 gaierror：[Errno 8]节点名或服务器名已提供或未知
  

我正在使用'localhost'，并且看不到任何失败原因。一些想法/解决方案？任何启动参数丢失或类似这样的事情？

谢谢 解决方案

这是 taskqueue.py ，它忽略了一个区分生产和开发环境。

在生产中，它通过连接目标和 hostname 。

在开发过程中，这不起作用，并且在尝试解析 worker.localhost address。

相反，它应该将任务主机设置为 ip：port dev_appserver正在运行后端。

已有。

如果您希望收到有关更新的通知，欢迎随时将其列出。

I'm using GAE Python 2.7 with the local development server. I have configured a backend

backends:
- name: worker
  class: B1
  options: dynamic

and I'm using the default taskqueue. Everything works fine and the backend and taskqueue are visible at the SDK console. Also the local development work starts without any errors:

Multiprocess Setup Complete:
Remote API Server [http://localhost:9200]
App Instance [http://localhost:9000]
Backend Instance: worker.0 [http://localhost:9100]
Backend Balancer: worker [http://localhost:9199]

BUT if I try to address the backend via a task

taskqueue.add(url='/xyz', method='POST', target='worker', params={'a':'b'})

this error raises:

ERROR An error occured while sending the task "task1" (Url: "/backend/languages/create_database/") in queue "default". Treating as a task error.
Traceback (most recent call last):
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 1884, in ExecuteTask
    connection.endheaders()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 937, in endheaders
    self._send_output(message_body)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 797, in _send_output
    self.send(msg)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 759, in send
    self.connect()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 740, in connect
    self.timeout, self.source_address)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 553, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
gaierror: [Errno 8] nodename nor servname provided, or not known

I'm using 'localhost' and can't see any reason why it fails. Some ideas / solutions? Any startup-parameter missing or somethin like that?

Thanks

解决方案

It's a bug in taskqueue.py, it misses a case to distinguish between production and the development environment.

In production, it does the right thing by concatenating the target with the hostname.

In development, that doesn't work and will produce the error you reported when trying to resolve worker.localhost address.

Instead it should set the task host to the ip:port dev_appserver is running the backend on.

There is already a bug in the public issue tracker that has been escalated to the engineering team.

Feel free to star it if you want to be notified about updates.

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