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108 lines (81 loc) · 3.06 KB
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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_IO_H
#define PYARROW_IO_H
#include <memory>
#include "arrow/io/interfaces.h"
#include "arrow/io/memory.h"
#include "arrow/python/visibility.h"
#include "arrow/python/config.h"
#include "arrow/python/common.h"
namespace arrow {
class MemoryPool;
namespace py {
class ARROW_NO_EXPORT PythonFile;
class ARROW_PYTHON_EXPORT PyReadableFile : public io::RandomAccessFile {
public:
explicit PyReadableFile(PyObject* file);
~PyReadableFile() override;
Status Close() override;
bool closed() const override;
Status Read(int64_t nbytes, int64_t* bytes_read, void* out) override;
Status Read(int64_t nbytes, std::shared_ptr<Buffer>* out) override;
// Thread-safe version
Status ReadAt(int64_t position, int64_t nbytes, int64_t* bytes_read,
void* out) override;
// Thread-safe version
Status ReadAt(int64_t position, int64_t nbytes, std::shared_ptr<Buffer>* out) override;
Status GetSize(int64_t* size) override;
Status Seek(int64_t position) override;
Status Tell(int64_t* position) const override;
private:
std::unique_ptr<PythonFile> file_;
};
class ARROW_PYTHON_EXPORT PyOutputStream : public io::OutputStream {
public:
explicit PyOutputStream(PyObject* file);
~PyOutputStream() override;
Status Close() override;
bool closed() const override;
Status Tell(int64_t* position) const override;
Status Write(const void* data, int64_t nbytes) override;
private:
std::unique_ptr<PythonFile> file_;
int64_t position_;
};
// TODO(wesm): seekable output files
// A Buffer subclass that keeps a PyObject reference throughout its
// lifetime, such that the Python object is kept alive as long as the
// C++ buffer is still needed.
// Keeping the reference in a Python wrapper would be incorrect as
// the Python wrapper can get destroyed even though the wrapped C++
// buffer is still alive (ARROW-2270).
class ARROW_PYTHON_EXPORT PyForeignBuffer : public Buffer {
public:
static Status Make(const uint8_t* data, int64_t size, PyObject* base,
std::shared_ptr<Buffer>* out);
private:
PyForeignBuffer(const uint8_t* data, int64_t size, PyObject* base)
: Buffer(data, size) {
Py_INCREF(base);
base_.reset(base);
}
OwnedRefNoGIL base_;
};
} // namespace py
} // namespace arrow
#endif // PYARROW_IO_H