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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
// Interfaces for defining middleware for Flight clients and
// servers. Currently experimental.
#pragma once
#include <memory>
#include <string>
#include <string_view>
#include <utility>
#include "arrow/flight/types.h"
#include "arrow/status.h"
namespace arrow {
namespace flight {
/// \brief A write-only wrapper around headers for an RPC call.
class ARROW_FLIGHT_EXPORT AddCallHeaders {
public:
virtual ~AddCallHeaders() = default;
/// \brief Add a header to be sent to the client.
///
/// \param[in] key The header name. Must be lowercase ASCII; some
/// transports may reject invalid header names.
/// \param[in] value The header value. Some transports may only
/// accept binary header values if the header name ends in "-bin".
virtual void AddHeader(const std::string& key, const std::string& value) = 0;
};
/// \brief An enumeration of the RPC methods Flight implements.
enum class FlightMethod : char {
Invalid = 0,
Handshake = 1,
ListFlights = 2,
GetFlightInfo = 3,
GetSchema = 4,
DoGet = 5,
DoPut = 6,
DoAction = 7,
ListActions = 8,
DoExchange = 9,
PollFlightInfo = 10,
};
/// \brief Get a human-readable name for a Flight method.
ARROW_FLIGHT_EXPORT
std::string ToString(FlightMethod method);
/// \brief Information about an instance of a Flight RPC.
struct ARROW_FLIGHT_EXPORT CallInfo {
public:
/// \brief The RPC method of this call.
FlightMethod method;
};
} // namespace flight
} // namespace arrow
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