Fetcher tries all proxies when a secondary chunk download error occurs.
This is a fix to issue 18143:
* New test cases for asserting the desired behavior: if a transfer of
a secondary chunk within a multi-chunk fetch fails, then the fetcher
needs to retry with other available proxies; it will only fail when no
additional proxies are available. The tests ensure both success (one
of the proxies eventually succeeds) and failure (all proxies fail)
cases.
* Small fix to LibcurlHttpFetcher to retry with other proxies upon
failure (error value) of a secondary chunk.
Other changes applied in the course of this fix:
* Massive refactoring of http_fetcher_unittest: substituted template
specialization in typed test setup with proper subclassing, resulting
in a safer and more maintainable infrastructure; extended URLs to
include all (most) parameters pertaining to test workload, such as
download size, flakiness, etc.
* Respective changes to test_http_server: it is now much more
independent of particular kind of tests, and more easily
parametrizable. Also, generalized several internal methods for better
readability and extensibility, such as writing of arbitrary payloads,
parsing headers,
* Migrated common definitions into http_common.{h,cc} (universal
HTTP-related stuff) and http_fetcher_unittest.h (shared definitions
pertaining to unit tests).
* Extended direct proxy resolver to generate a list of (non-) proxies,
so we can unit test proxy failure. Also, better logging to improve
testability.
* Some renaming of classes for better consistency.
BUG=chromium-os:18143
TEST=unit tests
Change-Id: Ib90b53394d7e47184d9953df8fc80348921e8af0
Reviewed-on: https://gerrit.chromium.org/gerrit/12092
Commit-Ready: Gilad Arnold <[email protected]>
Reviewed-by: Gilad Arnold <[email protected]>
Tested-by: Gilad Arnold <[email protected]>
13 files changed
