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a7bf07e86a
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. -->
75 lines
2.1 KiB
Python
Executable File
75 lines
2.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright 2015 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Makes DNS queries for A records to specified servers"""
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import argparse
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import threading
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import time
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import twisted.internet.reactor as reactor
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import twisted.internet.task as task
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import twisted.names.client as client
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def main():
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argp = argparse.ArgumentParser(description="Make DNS queries for A records")
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argp.add_argument(
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"-s",
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"--server_host",
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default="127.0.0.1",
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type=str,
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help="Host for DNS server to listen on for TCP and UDP.",
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)
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argp.add_argument(
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"-p",
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"--server_port",
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default=53,
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type=int,
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help="Port that the DNS server is listening on.",
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)
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argp.add_argument(
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"-n",
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"--qname",
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default=None,
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type=str,
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help="Name of the record to query for. ",
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)
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argp.add_argument(
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"-t",
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"--timeout",
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default=1,
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type=int,
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help="Force process exit after this number of seconds.",
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)
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args = argp.parse_args()
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def OnResolverResultAvailable(result):
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answers, authority, additional = result
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for a in answers:
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print(a.payload)
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def BeginQuery(reactor, qname):
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servers = [(args.server_host, args.server_port)]
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resolver = client.Resolver(servers=servers)
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deferred_result = resolver.lookupAddress(args.qname)
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deferred_result.addCallback(OnResolverResultAvailable)
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return deferred_result
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task.react(BeginQuery, [args.qname])
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if __name__ == "__main__":
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main()
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