tree 5302d861a12be5f32d7f8b6785f3ce4df22e1844
parent 000c7624d1d5da27d799a6dcde8456b95f3ece91
author Xiaochu Liu <xiaochu@chromium.org> 1554918548 -0700
committer chrome-bot <chrome-bot@chromium.org> 1557274958 -0700

update_engine: add logs and metrics for libcurl errors

curl_multi_perform may return code that is neither CURLM_OK or
CURLM_CALL_MULTI_PERFORM. When error returns we log them in
update_engine.log and send UMA metrics.

When update_engine does not get http response code from libcurl, we log
internal error code of the libcurl transfer for diagnosis.

Chrome CL to add the metrics enum is here: https://chromium-review.googlesource.com/c/chromium/src/+/1566150

BUG=chromium:927039
TEST=unittest

Change-Id: Ie8ce9dc0a6ce5ff6ffc2ff9425b652d125518558
Reviewed-on: https://chromium-review.googlesource.com/1562172
Commit-Ready: Sean Abraham <seanabraham@chromium.org>
Tested-by: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>