cel-python/cel_expr_python/py_cel_value.h at main · cel-expr/cel-python · GitHub

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// 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

// https://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, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#ifndef THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_

#define THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_

#include <Python.h> // IWYU pragma: keep - Needed for PyObject

#include <memory>

#include <string>

#include <utility>

#include "absl/base/thread_annotations.h"

#include "absl/functional/function_ref.h"

#include "absl/status/statusor.h"

#include "common/value.h"

#include "cel_expr_python/free_threading_mutex.h"

#include "cel_expr_python/py_cel_type.h"

#include "google/protobuf/arena.h"

#include <pybind11/pybind11.h>

namespace cel_python {

class PyCelArena;

class PyCelEnvInternal;

class PyMessageFactory;

// Wraps a cel::Value. Converts the cel::Value to a Python object on demand and

// caches the Python object for the lifetime of the CelValue.

// Retains a reference to the arena and message factory to ensure they outlive

// the cel::Value.

class PyCelValue {

public:

static void DefinePythonBindings(pybind11::module& m);

PyCelValue(cel::Value& cel_value, std::shared_ptr<PyCelArena> arena,

std::shared_ptr<PyCelEnvInternal> env);

// Move constructor.

PyCelValue(PyCelValue&& other) noexcept;

// Disallow copying and move assignment.

PyCelValue(const PyCelValue&) = delete;

PyCelValue& operator=(const PyCelValue&) = delete;

PyCelValue& operator=(PyCelValue&&) = delete;

virtual ~PyCelValue();

virtual PyCelType Type();

virtual PyObject* Value();

virtual PyObject* PlainValue();

virtual std::string ToString();

static cel::Value ToCelValue(PyObject* object,

std::shared_ptr<PyCelArena> arena,

PyMessageFactory* py_message_factory);

protected:

mutable FreeThreadingMutex mutex_;

cel::Value cel_value_;

PyObject* object_ ABSL_GUARDED_BY(mutex_);

PyObject* plain_object_ ABSL_GUARDED_BY(mutex_);

std::shared_ptr<PyCelArena> arena_;

std::shared_ptr<PyCelEnvInternal> env_;

};

// Variant of PyCelValue that is used to access a specific element of a list.

class PyCelListItemAccessor : public PyCelValue {

public:

PyCelListItemAccessor(cel::Value celValue, int index,

std::shared_ptr<PyCelArena> arena,

std::shared_ptr<PyCelEnvInternal> env)

: PyCelValue(celValue, std::move(arena), std::move(env)), index_(index) {}

// Move constructor.

PyCelListItemAccessor(PyCelListItemAccessor&& other) noexcept;

~PyCelListItemAccessor() override = default;

PyCelType Type() override;

PyObject* Value() override;

PyObject* PlainValue() override;

std::string ToString() override;

private:

void ResolveElementLocked() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_);

int index_;

bool resolved_ ABSL_GUARDED_BY(mutex_) = false;

cel::Value element_value_ ABSL_GUARDED_BY(mutex_);

};

// Variant of PyCelValue that is used to access a specific value from a map.

class PyCelMapItemAccessor : public PyCelValue {

public:

PyCelMapItemAccessor(cel::Value celValue, cel::Value key,

std::shared_ptr<PyCelArena> arena,

std::shared_ptr<PyCelEnvInternal> env)

: PyCelValue(celValue, std::move(arena), std::move(env)),

key_(std::move(key)) {}

// Move constructor.

PyCelMapItemAccessor(PyCelMapItemAccessor&& other) noexcept;

~PyCelMapItemAccessor() override = default;

PyCelType Type() override;

PyObject* Value() override;

PyObject* PlainValue() override;

std::string ToString() override;

private:

void ResolveElementLocked() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_);

cel::Value key_;

cel::Value element_value_ ABSL_GUARDED_BY(mutex_);

bool resolved_ ABSL_GUARDED_BY(mutex_) = false;

};

PyObject* CelValueToPyObject(const cel::Value& cel_value,

const std::shared_ptr<PyCelEnvInternal>& env,

const std::shared_ptr<PyCelArena>& arena,

bool plain_value);

absl::StatusOr<cel::Value> PyObjectToCelValue(

PyObject* py_object, const PyCelType& expected_type,

absl::FunctionRef<std::string()> context,

const std::shared_ptr<PyCelEnvInternal>& env, google::protobuf::Arena* arena,

bool bypass_type_check = false);

} // namespace cel_python

#endif // THIRD_PARTY_CEL_PYTHON_PY_CEL_VALUE_H_

cel-python/cel_expr_python/py_cel_value.h at main · cel-expr/cel-python · GitHub

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