如何在Google App Engine开发服务器上运行两个版本的Python应用程序

Question

我正在使用Ubuntu Server 13.10和Python 2.7。

我想要我的App Engine应用有两个版本：一个是管理版本，另一个是默认版本。我已经定义了这两个版本。目前，我的app.yaml文件是这样的：

application: application-id
version: 1
runtime: python27
api_version: 1
threadsafe: true

handlers:
- url: /css
  static_dir: css
- url: /js
  static_dir: js
- url: /
  script: python.MainPage.application
- url: /test.*
  script: gaeunit.application

libraries:
- name: webapp2
  version: latest
- name: jinja2
  version: latest


version: admin
runtime: python27
api_version: 1
threadsafe: true

handlers:
- url: /css
  static_dir: css
- url: /js
  static_dir: js
- url: /.*
  script: python.MainPage.application
  login: admin
  auth_fail_action: unauthorized
- url: /test.*
  script: python.MainPage.appication

libraries:
- name: webapp2
  version: latest
- name: jinja2
  version: latest

当我把这段代码部署到App Engine时，一切都按预期工作。但是，如果我尝试使用Google Cloud SDK中的dev_appserver.py来运行它，就会出现错误，具体错误信息如下：

Traceback (most recent call last):
  File "/home/katie/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 82, in <module>
    _run_file(__file__, globals())
  File "/home/katie/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 78, in _run_file
    execfile(_PATHS.script_file(script_name), globals_)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 902, in <module>
    main()
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 895, in main
    dev_server.start(options)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 672, in start
    options.yaml_files)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 556, in __init__
    module_configuration = ModuleConfiguration(yaml_path)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 82, in __init__
    self._yaml_path)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 272, in _parse_configuration
    return appinfo_includes.ParseAndReturnIncludePaths(f)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/api/appinfo_includes.py", line 63, in ParseAndReturnIncludePaths
    appyaml = appinfo.LoadSingleAppInfo(appinfo_file)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/api/appinfo.py", line 1826, in LoadSingleAppInfo
    listener.Parse(app_info)
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/api/yaml_listener.py", line 226, in Parse
    self._HandleEvents(self._GenerateEventParameters(stream, loader_class))
  File "/home/katie/google-cloud-sdk/platform/google_appengine/google/appengine/api/yaml_listener.py", line 177, in _HandleEvents
    raise yaml_errors.EventError(e, event_object)
google.appengine.api.yaml_errors.EventError: Duplicate attribute 'version'.
  in "aerobic-arcade-514/default/app.yaml", line 24, column 10

Answer 1

你可以在两个不同的端口上启动两个不同的开发应用服务器，只需要用 --port= 参数来覆盖默认的端口。不过，你需要有两个分开的 app.yaml 文件，而不是像之前那样使用同一个文件。当你运行 dev_appserver.py 时，要把配置文件作为最后一个参数传入，而不是目录（默认是 app.yaml）。

举个例子：

dev_appserver.py --port=8888 app_one.yaml
dev_appserver.py --port=9999 app_two.yaml

在你测试完之后，部署之前，确保你留下的最终文件名是 app.yaml；否则，你将无法完成这个过程。