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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.
#ifndef PYARROW_FLIGHT_H
#define PYARROW_FLIGHT_H
#include <memory>
#include <vector>
#include "arrow/flight/api.h"
#include "arrow/python/common.h"
#include "arrow/python/config.h"
namespace arrow {
namespace py {
namespace flight {
/// \brief A table of function pointers for calling from C++ into
/// Python.
class ARROW_PYTHON_EXPORT PyFlightServerVtable {
public:
std::function<void(PyObject*, const arrow::flight::Criteria*,
std::unique_ptr<arrow::flight::FlightListing>*)>
list_flights;
std::function<void(PyObject*, const arrow::flight::FlightDescriptor&,
std::unique_ptr<arrow::flight::FlightInfo>*)>
get_flight_info;
std::function<void(PyObject*, const arrow::flight::Ticket&,
std::unique_ptr<arrow::flight::FlightDataStream>*)>
do_get;
std::function<void(PyObject*, std::unique_ptr<arrow::flight::FlightMessageReader>)>
do_put;
std::function<void(PyObject*, const arrow::flight::Action&,
std::unique_ptr<arrow::flight::ResultStream>*)>
do_action;
std::function<void(PyObject*, std::vector<arrow::flight::ActionType>*)> list_actions;
};
class ARROW_PYTHON_EXPORT PyFlightServer : public arrow::flight::FlightServerBase {
public:
explicit PyFlightServer(PyObject* server, PyFlightServerVtable vtable);
// Like Serve(), but set up signals and invoke Python signal handlers
// if necessary. This function may return with a Python exception set.
Status ServeWithSignals();
Status ListFlights(const arrow::flight::Criteria* criteria,
std::unique_ptr<arrow::flight::FlightListing>* listings) override;
Status GetFlightInfo(const arrow::flight::FlightDescriptor& request,
std::unique_ptr<arrow::flight::FlightInfo>* info) override;
Status DoGet(const arrow::flight::Ticket& request,
std::unique_ptr<arrow::flight::FlightDataStream>* stream) override;
Status DoPut(std::unique_ptr<arrow::flight::FlightMessageReader> reader) override;
Status DoAction(const arrow::flight::Action& action,
std::unique_ptr<arrow::flight::ResultStream>* result) override;
Status ListActions(std::vector<arrow::flight::ActionType>* actions) override;
private:
OwnedRefNoGIL server_;
PyFlightServerVtable vtable_;
};
/// \brief A callback that obtains the next result from a Flight action.
typedef std::function<void(PyObject*, std::unique_ptr<arrow::flight::Result>*)>
PyFlightResultStreamCallback;
/// \brief A ResultStream built around a Python callback.
class ARROW_PYTHON_EXPORT PyFlightResultStream : public arrow::flight::ResultStream {
public:
/// \brief Construct a FlightResultStream from a Python object and callback.
/// Must only be called while holding the GIL.
explicit PyFlightResultStream(PyObject* generator,
PyFlightResultStreamCallback callback);
Status Next(std::unique_ptr<arrow::flight::Result>* result) override;
private:
OwnedRefNoGIL generator_;
PyFlightResultStreamCallback callback_;
};
/// \brief A wrapper around a FlightDataStream that keeps alive a
/// Python object backing it.
class ARROW_PYTHON_EXPORT PyFlightDataStream : public arrow::flight::FlightDataStream {
public:
/// \brief Construct a FlightDataStream from a Python object and underlying stream.
/// Must only be called while holding the GIL.
explicit PyFlightDataStream(PyObject* data_source,
std::unique_ptr<arrow::flight::FlightDataStream> stream);
std::shared_ptr<arrow::Schema> schema() override;
Status Next(arrow::flight::FlightPayload* payload) override;
private:
OwnedRefNoGIL data_source_;
std::unique_ptr<arrow::flight::FlightDataStream> stream_;
};
/// \brief A callback that obtains the next payload from a Flight result stream.
typedef std::function<void(PyObject*, arrow::flight::FlightPayload*)>
PyGeneratorFlightDataStreamCallback;
/// \brief A FlightDataStream built around a Python callback.
class ARROW_PYTHON_EXPORT PyGeneratorFlightDataStream
: public arrow::flight::FlightDataStream {
public:
/// \brief Construct a FlightDataStream from a Python object and underlying stream.
/// Must only be called while holding the GIL.
explicit PyGeneratorFlightDataStream(PyObject* generator,
std::shared_ptr<arrow::Schema> schema,
PyGeneratorFlightDataStreamCallback callback);
std::shared_ptr<arrow::Schema> schema() override;
Status Next(arrow::flight::FlightPayload* payload) override;
private:
OwnedRefNoGIL generator_;
std::shared_ptr<arrow::Schema> schema_;
PyGeneratorFlightDataStreamCallback callback_;
};
ARROW_PYTHON_EXPORT
Status CreateFlightInfo(const std::shared_ptr<arrow::Schema>& schema,
const arrow::flight::FlightDescriptor& descriptor,
const std::vector<arrow::flight::FlightEndpoint>& endpoints,
uint64_t total_records, uint64_t total_bytes,
std::unique_ptr<arrow::flight::FlightInfo>* out);
} // namespace flight
} // namespace py
} // namespace arrow
#endif // PYARROW_FLIGHT_H