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//
// Copyright 2015 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_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CONNECTOR_H
#define GRPC_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CONNECTOR_H
#include <grpc/support/port_platform.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channelz.h"
#include "src/core/lib/gprpp/orphanable.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/iomgr_fwd.h"
#include "src/core/lib/iomgr/resolved_address.h"
#include "src/core/lib/transport/transport.h"
#include "src/core/lib/transport/transport_fwd.h"
namespace grpc_core {
// Interface for connection-establishment functionality.
// Each transport that supports client channels (e.g., not inproc) must
// supply an implementation of this.
class SubchannelConnector : public InternallyRefCounted<SubchannelConnector> {
public:
struct Args {
// Address to connect to.
grpc_resolved_address* address;
// Set of pollsets interested in this connection.
grpc_pollset_set* interested_parties;
// Deadline for connection.
Timestamp deadline;
// Channel args to be passed to handshakers and transport.
ChannelArgs channel_args;
};
struct Result {
// The connected transport.
grpc_transport* transport = nullptr;
// Channel args to be passed to filters.
ChannelArgs channel_args;
// Channelz socket node of the connected transport, if any.
RefCountedPtr<channelz::SocketNode> socket_node;
void Reset() {
if (transport != nullptr) {
grpc_transport_destroy(transport);
transport = nullptr;
}
channel_args = ChannelArgs();
socket_node.reset();
}
};
// Attempts to connect.
// When complete, populates *result and invokes notify.
// Only one connection attempt may be in progress at any one time.
virtual void Connect(const Args& args, Result* result,
grpc_closure* notify) = 0;
// Cancels any in-flight connection attempt and shuts down the
// connector.
virtual void Shutdown(grpc_error_handle error) = 0;
void Orphan() override {
Shutdown(GRPC_ERROR_CREATE("Subchannel disconnected"));
Unref();
}
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CONNECTOR_H
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