* Remove iterator interface from LBPolicy Metadata
Trying to clear the way to think about how metadata is handled in core.
Right now this interface is only used for tests, so a single method that
does what's needed for that (and marked TestOnly) is provided for now.
In the future we'll certainly likely need API to access metadata from
load balancing policies. However, it seems likely that we'll want to
encourage access via lookup-by-key rather than lookup-by-iteration, and
so it seems likely we'll want to expose interfaces phrased in those
terms.
In the meantime, this change localizes some complexity to make it easier
to transition to new internal API's.
* mdcleanup
The iterator returns a newly-constructed `std::pair<absl::string_view, absl::string_view>`.
Compiled with `-Wrange-loop-bind-reference` on iOS due to new dependencies for
iOS tests.
* LB policy API improvements
* clang-format
* fix build
* a bit more cleanup
* use absl::variant<> for pick result
* fix retry_lb_drop test
* clang-format
* fix grpclb_end2end_test
* fix xds_end2end_test
* try to make variant code a bit cleaner
* clang-format
* fix memory leak
* fix build
* clang-format
* fix error refcount bug
* remove PickResult factory functions
* clang-format
* add ctors to structs
* clang-format
* fix clang-tidy
* update comments
* move LB recv_trailing_metadata callback instead of copying it
* use Match() instead of providing PickResult::Handle()
* don't use Match() for now, since it breaks lock annotations
* update retry_lb_fail test
* match/overload abstraction
* update projects
* match should really not accept mutable args
* typo
* tests
* usage comment
* mutable version
* build stuff
* clang-format
* add an escape hatch to avoid needing port_platform.h in files that do not need port_platform.h
* unused args
* Make it possible for a test to not depend on gpr
* add tests
* compile fix
* sepelling
The length of the address was invalid (uninitialized data). It just so
happens that the posix iomgr implementation wasn't affected by this, but
the EventEngine iomgr asserts the validity of addresses and would crash.
I've added an assert of address validity in the posix iomgr impl as
well.
The urgent argument is a platform-specific flag that leaked into the (ideally) platform-independent HTTP/2 transport layer. In an effort to clean up the cross-platform API surface, it would be helpful if we can remove this argument from the TCP Read api without losing the performance optimization that was introduced along with it (see #18240).
This replaces gflags. Added TODOs where use of `absl::Duration` or `absl::FlagSaver` might be preferred in follow-up cleanup. Fixes#24493.
This reverts commit da66b7d14e.
NEW:
* Adds references to `absl/flags/declare.h`, new to LTS 2020923.2 imported in commit 5b43440.
* Works around MSVC 2017 compiler error with large help text on flags by reducing the help text.
Craig Tiller