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Co-authored-by: ctiller <ctiller@users.noreply.github.com>
This is a big rewrite of global config.
It does a few things, all somewhat intertwined:
1. centralize the list of configuration we have to a yaml file that can
be parsed, and code generated from it
2. add an initialization and a reset stage so that config vars can be
centrally accessed very quickly without the need for caching them
3. makes the syntax more C++ like (less macros!)
4. (optionally) adds absl flags to the OSS build
This first round of changes is intended to keep the system where it is
without major changes. We pick up absl flags to match internal code and
remove one point of deviation - but importantly continue to read from
the environment variables. In doing so we don't force absl flags on our
customers - it's possible to configure grpc without the flags - but
instead allow users that do use absl flags to configure grpc using that
mechanism. Importantly this lets internal customers configure grpc the
same everywhere.
Future changes along this path will be two-fold:
1. Move documentation generation into the code generation step, so that
within the source of truth yaml file we can find all documentation and
data about a configuration knob - eliminating the chance of forgetting
to document something in all the right places.
2. Provide fuzzing over configurations. Currently most config variables
get stashed in static constants across the codebase. To fuzz over these
we'd need a way to reset those cached values between fuzzing rounds,
something that is terrifically difficult right now, but with these
changes should simply be a reset on `ConfigVars`.
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Co-authored-by: ctiller <ctiller@users.noreply.github.com>
* Revert "Revert "xDS RouteConfig: use ValidationErrors and add unit test (#31418)" (#31653)"
This reverts commit 335b74fea7.
* use auto instead of explicitly naming the protobuf map type
Specific changes:
- Use absl::variant<> for HashPolicy types.
- Pull validation of resulting LB policy configs out of ClusterSpecifierPlugin registry and into RouteConfig validation.
- Don't ignore missing Any fields in HTTP filter configs if is_optional is true, since is_optional should apply only to unsupported filter types, not to malformed resource protos.
- Use ExtractXdsExtension() for HttpConnectionManager config itself.
- Minor API improvements to StatusCodeSet to make it a bit more useful in tests.
- Changed StringMatcher to return the underlying error message when a regex fails to compile.
- Fix a bug whereby a ClusterSpecifierPlugin would not be returned if it was not used in a vhost, even if it was used in another vhost.
* Revert "Revert "xDS Listener: use ValidationErrors and add unit test (#31351)" (#31456)"
This reverts commit ab3d62ae8f.
* Revert "Revert "xds_http_filters_test: fix includes for import (#31454)" (#31455)"
This reverts commit 32590d110a.
* fix import
* work around internal differences in Any API (string vs. cord)
* iwyu
Additional changes:
- Use absl::variant<> to differentiate between API listeners and TCP listeners.
- Use absl::variant<> to differentiate between an RDS reference and an inline RouteConfig.
- Use common xDS extension code for transport socket extensions in both Listener and Cluster resources.
- Improve xDS HTTP filter registration mechanism.
- Use ValidationErrors for HTTP filter config validation.
* subchannel: include IP address in status messages
* Automated change: Fix sanity tests
* add comment about lock annotations
* clang-format
Co-authored-by: markdroth <markdroth@users.noreply.github.com>
Mark D. Roth
Eugene Ostroukhov
Craig Tiller
Jan Tattermusch
Vignesh Babu
Yash Tibrewal