能从http://localhost:8100/remote_api加载数据（Google App 引擎）吗

Question

我可以从GAE下载数据（http://zjm1126.appspot.com/remote_api），这是我的代码：

appcfg.py download_data  --application=zjm1126 --url=http://zjm1126.appspot.com/remote_api --filename=a.csv

而且它成功了：

D:\zjm_demo\app>appcfg.py download_data  --application=zjm1126 --url=http://zjm1
126.appspot.com/remote_api --filename=a.csv
Downloading data records.
[INFO    ] Logging to bulkloader-log-20100618.162421
[INFO    ] Throttling transfers:
[INFO    ] Bandwidth: 250000 bytes/second
[INFO    ] HTTP connections: 8/second
[INFO    ] Entities inserted/fetched/modified: 20/second
[INFO    ] Batch Size: 10
[INFO    ] Opening database: bulkloader-progress-20100618.162421.sql3
[INFO    ] Opening database: bulkloader-results-20100618.162421.sql3
[INFO    ] Connecting to zjm1126.appspot.com/remote_api
Please enter login credentials for zjm1126.appspot.com
Email: zjm1126@gmail.com
Password for zjm1126@gmail.com:
[INFO    ] Downloading kinds: [u'LogText', u'Greeting', u'Forum', u'Thread']
....
[INFO    ] Have 0 entities, 0 previously transferred
[INFO    ] 0 entities (8804 bytes) transferred in 11.3 seconds

所以我想知道能不能从127.0.0.1加载数据，这是我的代码：

appcfg.py download_data  --application=zjm1126 --url=http://localhost:8100/remote_api --filename=a.csv

但是出现了错误：

D:\zjm_demo\app>appcfg.py download_data  --application=zjm1126 --url=http://loca
lhost:8100/remote_api --filename=a.csv
Downloading data records.
[INFO    ] Logging to bulkloader-log-20100618.162325
[INFO    ] Throttling transfers:
[INFO    ] Bandwidth: 250000 bytes/second
[INFO    ] HTTP connections: 8/second
[INFO    ] Entities inserted/fetched/modified: 20/second
[INFO    ] Batch Size: 10
[INFO    ] Opening database: bulkloader-progress-20100618.162325.sql3
[INFO    ] Opening database: bulkloader-results-20100618.162325.sql3
Please enter login credentials for localhost
Email: zjm1126@gmail.com
Password for zjm1126@gmail.com:
[INFO    ] Connecting to localhost:8100/remote_api
[ERROR   ] Exception during authentication
Traceback (most recent call last):
  File "d:\Program Files\Google\google_appengine\google\appengine\tools\bulkload
er.py", line 3169, in Run
    self.request_manager.Authenticate()
  File "d:\Program Files\Google\google_appengine\google\appengine\tools\bulkload
er.py", line 1178, in Authenticate
    remote_api_stub.MaybeInvokeAuthentication()
  File "d:\Program Files\Google\google_appengine\google\appengine\ext\remote_api
\remote_api_stub.py", line 542, in MaybeInvokeAuthentication
    datastore_stub._server.Send(datastore_stub._path, payload=None)
  File "d:\Program Files\Google\google_appengine\google\appengine\tools\appengin
e_rpc.py", line 346, in Send
    f = self.opener.open(req)
  File "D:\Python25\lib\urllib2.py", line 387, in open
    response = meth(req, response)
  File "D:\Python25\lib\urllib2.py", line 498, in http_response
    'http', request, response, code, msg, hdrs)
  File "D:\Python25\lib\urllib2.py", line 425, in error
    return self._call_chain(*args)
  File "D:\Python25\lib\urllib2.py", line 360, in _call_chain
    result = func(*args)
  File "D:\Python25\lib\urllib2.py", line 506, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 404: Not Found
[INFO    ] Authentication Failed

那我该怎么办呢，

谢谢

Answer 1

与其使用

appcfg.py download_data  --application=zjm1126 --url=http://localhost:8100/remote_api --filename=a.csv

不如试试使用

appcfg.py download_data   --filename=a.csv <folder containing your app.yaml>

Answer 2

你可能需要使用 --kind=LogText 来指定你的日志类型，然后对其他类型重复这个操作，因为开发用的网络服务器不支持一次下载所有类型的文件，它只能一次下载一个。

不过，我不确定这样做是否会导致404错误。

Answer 3

默认的端口是 8080，而不是 8100。如果你使用 8100，会出现 Authentication Failed 的错误。

另外，如果你的 app.yaml 文件中启用了远程 API，使用的是：

builtins:
- remote_api: on

那么你需要使用以下的 URL：

http://localhost:8080/_ah/remote_api

而不是：

http://localhost:8080/remote_api

此外，你还需要指定一个类型（对于开发服务器），比如：

--kind=MyDataClass