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[EventEngine] PosixEventEngine DNS Resolver (#32701) This PR implements a c-ares based DNS resolver for EventEngine with the reference from the original [grpc_ares_wrapper.h](../blob/master/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h). The PosixEventEngine DNSResolver is implemented on top of that. Tests which use the client channel resolver API ([resolver.h](../blob/master/src/core/lib/resolver/resolver.h#L54)) are ported, namely the [resolver_component_test.cc](../blob/master/test/cpp/naming/resolver_component_test.cc) and the [cancel_ares_query_test.cc](../blob/master/test/cpp/naming/cancel_ares_query_test.cc). The WindowsEventEngine DNSResolver will use the same EventEngine's grpc_ares_wrapper and will be worked on next. The [resolve_address_test.cc](https://github.com/grpc/grpc/blob/master/test/core/iomgr/resolve_address_test.cc) which uses the iomgr [DNSResolver](../blob/master/src/core/lib/iomgr/resolve_address.h#L44) API has been ported to EventEngine's dns_test.cc. That leaves only 2 tests which use iomgr's API, notably the [dns_resolver_cooldown_test.cc](../blob/master/test/core/client_channel/resolvers/dns_resolver_cooldown_test.cc) and the [goaway_server_test.cc](../blob/master/test/core/end2end/goaway_server_test.cc) which probably need to be restructured to use EventEngine DNSResolver (for one thing they override the original grpc_ares_wrapper's free functions). I will try to tackle these in the next step. <!-- If you know who should review your pull request, please assign it to that person, otherwise the pull request would get assigned randomly. If your pull request is for a specific language, please add the appropriate lang label. -->
1 year ago
// Copyright 2023 The gRPC Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef GRPC_TEST_CPP_UTIL_GET_GRPC_TEST_RUNFILE_DIR_H
#define GRPC_TEST_CPP_UTIL_GET_GRPC_TEST_RUNFILE_DIR_H
#include <string>
#include "absl/types/optional.h"
namespace grpc {
// Gets the absolute path of the runfile directory (a bazel/blaze concept) for a
// gRPC test. The path to the data files can be referred by joining the runfile
// directory with the workspace-relative path (e.g.
// "test/cpp/util/get_grpc_test_runfile_dir.h").
absl::optional<std::string> GetGrpcTestRunFileDir();
} // namespace grpc
#endif // GRPC_TEST_CPP_UTIL_GET_GRPC_TEST_RUNFILE_DIR_H