Work around App Engine flakiness by retrying upon URLError...

Work around App Engine flakiness by retrying upon URLError
("Connection timed out"). This allowed me to successfully upload a CL
I have been stuck on for a couple of hours.

BUG=none
TEST=none


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=71513

[Ken Russell (switch to Gerrit), 2011-01-14 00:59:25]

Please review. Thanks.

Please note that I'm seeing some presubmit test failures
(testUpdateUnstagedConflict (__main__.GitWrapperTestCase), testUpdateCheckout
(__main__.GitWrapperTestCase), testUpdateUnstagedConflict
(__main__.GitWrapperTestCase), testMultiSolutionsJobs
(__main__.GClientSmokeBoth)), but these are also happening with an unmodified
depot_tools repository.

[M-A Ruel, 2011-01-14 13:56:55]

You need to filter the error code since it could be a genuine invalid url and I
don't want to have it retry in that case.

[Ken Russell (switch to Gerrit), 2011-01-14 23:13:31]

On 2011/01/14 13:56:55, Marc-Antoine Ruel wrote:
> You need to filter the error code since it could be a genuine invalid url and
I
> don't want to have it retry in that case.

Done. There's no error code in URLError but there may be a reason string
containing the substring "110" which we can look for.

[M-A Ruel, 2011-01-14 23:31:15]

lgtm

I'll need to upstream it to rietveld though.

[jam, 2011-01-15 00:13:32]

I get a crash with this to the internal server, and I can only upload without
it:

Traceback (most recent call last):
 File "A:\depot_tools\gcl.py", line 1402, in <module>
   sys.exit(main(sys.argv[1:]))
 File "A:\depot_tools\gcl.py", line 1382, in main
   return command(argv[1:])
 File "A:\depot_tools\gcl.py", line 749, in hook
   return function(change_info, args)
 File "A:\depot_tools\gcl.py", line 866, in CMDupload
   issue, patchset = upload.RealMain(upload_arg, change_info.patch)
 File "A:\depot_tools\third_party\upload.py", line 1754, in RealMain
   response_body = rpc_server.Send("/upload", body, content_type=ctype)
 File "A:\depot_tools\third_party\upload.py", line 406, in Send
   reason = e.reason
AttributeError: 'HTTPError' object has no attribute 'reason'