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//
// Copyright 2016 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_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_FAKE_FAKE_RESOLVER_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_FAKE_FAKE_RESOLVER_H
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
#include "src/core/ext/filters/client_channel/uri_parser.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gprpp/ref_counted.h"
#define GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR \
"grpc.fake_resolver.response_generator"
namespace grpc_core {
class FakeResolver;
/// A mechanism for generating responses for the fake resolver.
/// An instance of this class is passed to the fake resolver via a channel
/// argument (see \a MakeChannelArg()) and used to inject and trigger custom
/// resolutions.
// TODO(roth): I would ideally like this to be InternallyRefCounted
// instead of RefCounted, but external refs are currently needed to
// encode this in channel args. Once channel_args are converted to C++,
// see if we can find a way to fix this.
class FakeResolverResponseGenerator
: public RefCounted<FakeResolverResponseGenerator> {
public:
FakeResolverResponseGenerator() {}
// Instructs the fake resolver associated with the response generator
// instance to trigger a new resolution with the specified response.
void SetResponse(grpc_channel_args* next_response);
// Sets the re-resolution response, which is returned by the fake resolver
// when re-resolution is requested (via \a RequestReresolutionLocked()).
// The new re-resolution response replaces any previous re-resolution
// response that may have been set by a previous call.
// If the re-resolution response is set to NULL, then the fake
// resolver will not return anything when \a RequestReresolutionLocked()
// is called.
void SetReresolutionResponse(grpc_channel_args* response);
// Tells the resolver to return a transient failure (signalled by
// returning a null result with no error).
void SetFailure();
// Returns a channel arg containing \a generator.
static grpc_arg MakeChannelArg(FakeResolverResponseGenerator* generator);
// Returns the response generator in \a args, or null if not found.
static FakeResolverResponseGenerator* GetFromArgs(
const grpc_channel_args* args);
private:
friend class FakeResolver;
static void SetResponseLocked(void* arg, grpc_error* error);
static void SetReresolutionResponseLocked(void* arg, grpc_error* error);
static void SetFailureLocked(void* arg, grpc_error* error);
FakeResolver* resolver_ = nullptr; // Do not own.
};
} // namespace grpc_core
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_FAKE_FAKE_RESOLVER_H \
*/
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