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py_cel_python_extension.cc
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// Copyright 2025 Google LLC
//
// 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.
#include "cel_expr_python/py_cel_python_extension.h"
#include <Python.h> // IWYU pragma: keep - Needed for PyObject
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/status/status.h"
#include "checker/type_checker_builder.h"
#include "common/decl.h"
#include "common/function_descriptor.h"
#include "common/kind.h"
#include "common/type.h"
#include "compiler/compiler.h"
#include "runtime/runtime_builder.h"
#include "runtime/runtime_options.h"
#include "cel_expr_python/cel_extension.h"
#include "cel_expr_python/py_cel_function.h"
#include "cel_expr_python/py_cel_function_decl.h"
#include "cel_expr_python/py_cel_overload.h"
#include "cel_expr_python/py_cel_type.h"
#include "cel_expr_python/status_macros.h"
#include "google/protobuf/arena.h"
#include "google/protobuf/descriptor.h"
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
namespace cel_python {
namespace py = ::pybind11;
static const cel::FunctionDescriptorOptions kFunctionDescriptorOptions = {
.is_strict = true, .is_contextual = true};
void PyCelPythonExtension::DefinePythonBindings(py::module_& m) {
py::class_<CelExtension>(m, "CelExtensionBase")
.def(py::init<std::string>(), py::arg("name"));
py::class_<PyCelPythonExtension, CelExtension>(m, "CelExtension")
.def(py::init<std::string, std::vector<PyCelFunctionDecl>>(),
py::arg("name"), py::arg("functions"));
}
PyCelPythonExtension::PyCelPythonExtension(
std::string name, std::vector<PyCelFunctionDecl> functions)
: CelExtension(std::move(name)), functions_(std::move(functions)) {}
namespace {
absl::Status ConfigureChecker(cel::TypeCheckerBuilder& checker_builder,
const std::vector<PyCelFunctionDecl>& functions) {
google::protobuf::Arena* arena = checker_builder.arena();
const google::protobuf::DescriptorPool* descriptor_pool =
checker_builder.descriptor_pool();
for (const PyCelFunctionDecl& function : functions) {
cel::FunctionDecl function_decl;
function_decl.set_name(function.name());
for (const PyCelOverload& overload : function.overloads()) {
cel::OverloadDecl overload_decl;
overload_decl.set_id(overload.overload_id());
CEL_PYTHON_ASSIGN_OR_RETURN(
cel::Type cel_type, PyCelType::ToCelType(overload.return_type(),
arena, *descriptor_pool));
overload_decl.set_result(cel_type);
overload_decl.set_member(overload.is_member());
auto& mutable_args = overload_decl.mutable_args();
mutable_args.reserve(overload.parameters().size());
for (const auto& arg : overload.parameters()) {
CEL_PYTHON_ASSIGN_OR_RETURN(
cel::Type cel_type,
PyCelType::ToCelType(arg, arena, *descriptor_pool));
mutable_args.push_back(cel_type);
}
CEL_PYTHON_RETURN_IF_ERROR(
function_decl.AddOverload(std::move(overload_decl)));
}
CEL_PYTHON_RETURN_IF_ERROR(checker_builder.MergeFunction(function_decl));
}
return absl::OkStatus();
}
} // namespace
cel::CompilerLibrary PyCelPythonExtension::GetCompilerLibrary() {
// Capturing `this` is safe because it is guaranteed to outlive
// PyCelEnvInternal, which creates and destroys a transient CompilerBuilder -
// the only consumer of the CompilerLibrary.
return cel::CompilerLibrary(
name(),
/*configure_parser=*/nullptr,
/*configure_checker=*/
[this](cel::TypeCheckerBuilder& checker_builder) -> absl::Status {
return ConfigureChecker(checker_builder, functions_);
});
}
absl::Status PyCelPythonExtension::ConfigureRuntime(
cel::RuntimeBuilder& runtime_builder, const cel::RuntimeOptions& opts) {
for (const PyCelFunctionDecl& function : functions_) {
for (const PyCelOverload& overload : function.overloads()) {
std::vector<cel::Kind> types;
types.reserve(overload.parameters().size());
for (const PyCelType& arg : overload.parameters()) {
if (arg.GetKind() == cel::Kind::kDyn) {
// C++ runtime dispatcher historically uses kAny for wildcard type (
// not distinguishing between dyn and any)
types.push_back(cel::Kind::kAny);
} else {
types.push_back(arg.GetKind());
}
}
cel::FunctionDescriptor descriptor(function.name(), overload.is_member(),
types, kFunctionDescriptorOptions);
if (!overload.py_function().is_none()) {
CEL_PYTHON_RETURN_IF_ERROR(runtime_builder.function_registry().Register(
descriptor, std::make_unique<PyCelFunctionAdapter>(
function.name(), overload.return_type(),
overload.py_function())));
} else {
CEL_PYTHON_RETURN_IF_ERROR(
runtime_builder.function_registry().RegisterLazyFunction(
descriptor));
}
}
}
return absl::OkStatus();
}
} // namespace cel_python