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>
7 files changed