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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 KIND, 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_ENV_INTERNAL_H_

#define THIRD_PARTY_CEL_PYTHON_PY_CEL_ENV_INTERNAL_H_

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

#include <memory>

#include <string>

#include <unordered_map>

#include <vector>

#include "absl/base/call_once.h"

#include "absl/container/flat_hash_map.h"

#include "absl/status/status.h"

#include "absl/status/statusor.h"

#include "common/container.h"

#include "compiler/compiler.h"

#include "env/env.h"

#include "env/env_runtime.h"

#include "runtime/runtime.h"

#include "cel_expr_python/cel_extension.h"

#include "cel_expr_python/py_cel_env_config.h"

#include "cel_expr_python/py_cel_function.h"

#include "cel_expr_python/py_cel_function_decl.h"

#include "cel_expr_python/py_cel_options.h"

#include "cel_expr_python/py_cel_type.h"

#include "cel_expr_python/py_descriptor_database.h"

#include "cel_expr_python/py_message_factory.h"

#include "google/protobuf/descriptor.h"

#include "google/protobuf/dynamic_message.h"

#include "google/protobuf/message.h"

namespace cel_python {

class PyCelEnvInternal;

class CelExtensionHandle {

public:

explicit CelExtensionHandle(PyObject* extension);

CelExtensionHandle(const CelExtensionHandle& other) = delete;

CelExtensionHandle(CelExtensionHandle&& other);

~CelExtensionHandle();

absl::StatusOr<CelExtension*> GetExtension();

private:

// The Python object that was passed to the constructor and is retained for

// the duration of the CelExtensionHandle lifetime.

PyObject* py_extension_;

// Non-retaining pointer to the CelExtension encapsulated by `py_extension_`.

// It must be deleted before `py_extension_`.

CelExtension* cel_extension_;

};

// PyCelEnvInternal is a container for internal CEL components not exposed to

// the python side.

class PyCelEnvInternal {

public:

~PyCelEnvInternal();

static absl::StatusOr<std::shared_ptr<PyCelEnvInternal>> NewCelEnvInternal(

const PyCelEnvConfig& env_config, const PyCelOptions& options,

PyObject* py_descriptor_pool,

const std::unordered_map<std::string, PyCelType>& variable_types,

const std::vector<PyObject*>& extensions,

const cel::ExpressionContainer& container,

const std::vector<std::shared_ptr<PyCelFunctionDecl>>& functions,

const std::unordered_map<std::string, py::object>& function_impls);

const PyCelEnvConfig& GetEnvConfig() const { return env_config_; }

const PyCelOptions& GetOptions() const { return options_; }

absl::StatusOr<const cel::Compiler*> GetCompiler() const;

enum RuntimeMode {

// Standard CEL runtime with warnings treated as errors.

kStandard,

// Standard CEL runtime with warnings ignored. Useful for CEL expressions

// that bypass type checking.

kStandardIgnoreWarnings,

};

absl::StatusOr<const cel::Runtime*> GetRuntime(

RuntimeMode runtime_mode) const;

const google::protobuf::DescriptorPool* GetDescriptorPool() const {

return descriptor_pool_.get();

}

google::protobuf::MessageFactory* GetMessageFactory() const {

return &message_factory_;

}

std::shared_ptr<PyMessageFactory> GetPyMessageFactory() const {

return py_message_factory_;

}

const PyCelType& GetVariableType(const std::string& name) const;

private:

// Use NewCelEnvInternal() to create an instance.

PyCelEnvInternal(

const PyCelEnvConfig& env_config, const PyCelOptions& options,

PyObject* py_descriptor_pool,

std::vector<CelExtensionHandle> extension_handles,

absl::flat_hash_map<std::string, py::object>& function_impls);

absl::StatusOr<std::unique_ptr<cel::Compiler>> BuildCompiler() const;

absl::StatusOr<std::unique_ptr<cel::Runtime>> BuildRuntime(

RuntimeMode runtime_mode) const;

cel::Env cel_env_;

cel::EnvRuntime cel_env_runtime_;

PyCelEnvConfig env_config_;

PyCelOptions options_;

PyDescriptorDatabase py_descriptor_database_;

std::shared_ptr<google::protobuf::DescriptorPool> descriptor_pool_;

mutable google::protobuf::DynamicMessageFactory message_factory_;

std::shared_ptr<PyMessageFactory> py_message_factory_;

absl::flat_hash_map<std::string, PyCelType> variable_types_;

std::vector<CelExtensionHandle> extensions_;

absl::flat_hash_map<std::string, py::object> function_impls_;

mutable absl::once_flag compiler_once_;

mutable absl::StatusOr<std::unique_ptr<cel::Compiler>> compiler_;

mutable absl::once_flag standard_runtime_once_;

mutable absl::StatusOr<std::unique_ptr<cel::Runtime>> standard_runtime_;

mutable absl::once_flag standard_ignore_warnings_runtime_once_;

mutable absl::StatusOr<std::unique_ptr<cel::Runtime>>

standard_ignore_warnings_runtime_;

};

} // namespace cel_python

#endif // THIRD_PARTY_CEL_PYTHON_PY_CEL_ENV_INTERNAL_H_