Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / ext / filters / client_channel / resolver / fake / fake_resolver.h

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h b/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h
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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/resolver.h"
+#include "src/core/lib/channel/channel_args.h"
+#include "src/core/lib/gprpp/ref_counted.h"
+#include "src/core/lib/iomgr/error.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();
+  ~FakeResolverResponseGenerator();
+
+  // Instructs the fake resolver associated with the response generator
+  // instance to trigger a new resolution with the specified result. If the
+  // resolver is not available yet, delays response setting until it is. This
+  // can be called at most once before the resolver is available.
+  void SetResponse(Resolver::Result result);
+
+  // 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.
+  void SetReresolutionResponse(Resolver::Result result);
+
+  // Unsets the re-resolution response.  After this, the fake resolver will
+  // not return anything when \a RequestReresolutionLocked() is called.
+  void UnsetReresolutionResponse();
+
+  // Tells the resolver to return a transient failure.
+  void SetFailure();
+
+  // Same as SetFailure(), but instead of returning the error
+  // immediately, waits for the next call to RequestReresolutionLocked().
+  void SetFailureOnReresolution();
+
+  // 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 RefCountedPtr<FakeResolverResponseGenerator> GetFromArgs(
+      const grpc_channel_args* args);
+
+ private:
+  friend class FakeResolver;
+  // Set the corresponding FakeResolver to this generator.
+  void SetFakeResolver(RefCountedPtr<FakeResolver> resolver);
+
+  static void SetResponseLocked(void* arg, grpc_error* error);
+  static void SetReresolutionResponseLocked(void* arg, grpc_error* error);
+  static void SetFailureLocked(void* arg, grpc_error* error);
+
+  // Mutex protecting the members below.
+  Mutex mu_;
+  RefCountedPtr<FakeResolver> resolver_;
+  Resolver::Result result_;
+  bool has_result_ = false;
+};
+
+}  // namespace grpc_core
+
+#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_FAKE_FAKE_RESOLVER_H \
+        */