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// Copyright 2023 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 "extensions/protobuf/struct_type.h"
#include <limits>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/base/optimization.h"
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/str_cat.h"
#include "base/type_manager.h"
#include "extensions/protobuf/enum_type.h"
#include "extensions/protobuf/type.h"
#include "internal/status_macros.h"
#include "google/protobuf/descriptor.h"
namespace cel::extensions {
absl::StatusOr<Handle<ProtoStructType>> ProtoStructType::Resolve(
TypeManager& type_manager, const google::protobuf::Descriptor& descriptor) {
CEL_ASSIGN_OR_RETURN(auto type,
type_manager.ResolveType(descriptor.full_name()));
if (ABSL_PREDICT_FALSE(!type.has_value())) {
return absl::NotFoundError(absl::StrCat(
"Missing protocol buffer message type implementation for \"",
descriptor.full_name(), "\""));
}
if (ABSL_PREDICT_FALSE(!(*type)->Is<ProtoStructType>())) {
return absl::FailedPreconditionError(absl::StrCat(
"Unexpected protocol buffer message type implementation for \"",
descriptor.full_name(), "\": ", (*type)->DebugString()));
}
return std::move(type).value().As<ProtoStructType>();
}
namespace {
absl::StatusOr<Handle<Type>> FieldDescriptorToTypeSingular(
TypeManager& type_manager, const google::protobuf::FieldDescriptor* field_desc) {
switch (field_desc->type()) {
case google::protobuf::FieldDescriptor::TYPE_DOUBLE:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_FLOAT:
return type_manager.type_factory().GetDoubleType();
case google::protobuf::FieldDescriptor::TYPE_INT64:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_INT32:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_SFIXED32:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_SFIXED64:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_SINT32:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_SINT64:
return type_manager.type_factory().GetIntType();
case google::protobuf::FieldDescriptor::TYPE_UINT64:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_FIXED64:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_FIXED32:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_UINT32:
return type_manager.type_factory().GetUintType();
case google::protobuf::FieldDescriptor::TYPE_BOOL:
return type_manager.type_factory().GetBoolType();
case google::protobuf::FieldDescriptor::TYPE_STRING:
return type_manager.type_factory().GetStringType();
case google::protobuf::FieldDescriptor::TYPE_GROUP:
ABSL_FALLTHROUGH_INTENDED;
case google::protobuf::FieldDescriptor::TYPE_MESSAGE:
return ProtoType::Resolve(type_manager, *field_desc->message_type());
case google::protobuf::FieldDescriptor::TYPE_BYTES:
return type_manager.type_factory().GetBytesType();
case google::protobuf::FieldDescriptor::TYPE_ENUM:
return ProtoType::Resolve(type_manager, *field_desc->enum_type());
}
}
absl::StatusOr<Handle<Type>> FieldDescriptorToTypeRepeated(
TypeManager& type_manager, const google::protobuf::FieldDescriptor* field_desc) {
CEL_ASSIGN_OR_RETURN(auto type,
FieldDescriptorToTypeSingular(type_manager, field_desc));
// The wrapper types make zero sense as a list element, list elements of
// wrapper types can never be null.
return type_manager.type_factory().CreateListType(
UnwrapType(std::move(type)));
}
absl::StatusOr<Handle<Type>> FieldDescriptorToType(
TypeManager& type_manager, const google::protobuf::FieldDescriptor* field_desc) {
if (field_desc->is_map()) {
const auto* key_desc = field_desc->message_type()->map_key();
CEL_ASSIGN_OR_RETURN(auto key_type,
FieldDescriptorToTypeSingular(type_manager, key_desc));
const auto* value_desc = field_desc->message_type()->map_value();
CEL_ASSIGN_OR_RETURN(auto value_type, FieldDescriptorToTypeSingular(
type_manager, value_desc));
// The wrapper types make zero sense as a map value, map values of
// wrapper types can never be null.
return type_manager.type_factory().CreateMapType(
std::move(key_type), UnwrapType(std::move(value_type)));
}
if (field_desc->is_repeated()) {
return FieldDescriptorToTypeRepeated(type_manager, field_desc);
}
return FieldDescriptorToTypeSingular(type_manager, field_desc);
}
} // namespace
class ProtoStructTypeFieldIterator final : public StructType::FieldIterator {
public:
explicit ProtoStructTypeFieldIterator(const google::protobuf::Descriptor& descriptor)
: descriptor_(descriptor) {}
bool HasNext() override { return index_ < descriptor_.field_count(); }
absl::StatusOr<StructType::Field> Next(TypeManager& type_manager) override {
if (ABSL_PREDICT_FALSE(index_ >= descriptor_.field_count())) {
return absl::FailedPreconditionError(
"StructType::FieldIterator::Next() called when "
"StructType::FieldIterator::HasNext() returns false");
}
const auto* field = descriptor_.field(index_);
CEL_ASSIGN_OR_RETURN(auto type, FieldDescriptorToType(type_manager, field));
++index_;
return StructType::Field(ProtoStructType::MakeFieldId(field->number()),
field->name(), field->number(), std::move(type),
field);
}
absl::StatusOr<FieldId> NextId(TypeManager& type_manager) override {
if (ABSL_PREDICT_FALSE(index_ >= descriptor_.field_count())) {
return absl::FailedPreconditionError(
"StructType::FieldIterator::Next() called when "
"StructType::FieldIterator::HasNext() returns false");
}
return ProtoStructType::MakeFieldId(descriptor_.field(index_++)->number());
}
absl::StatusOr<absl::string_view> NextName(
TypeManager& type_manager) override {
if (ABSL_PREDICT_FALSE(index_ >= descriptor_.field_count())) {
return absl::FailedPreconditionError(
"StructType::FieldIterator::Next() called when "
"StructType::FieldIterator::HasNext() returns false");
}
return descriptor_.field(index_++)->name();
}
absl::StatusOr<int64_t> NextNumber(TypeManager& type_manager) override {
if (ABSL_PREDICT_FALSE(index_ >= descriptor_.field_count())) {
return absl::FailedPreconditionError(
"StructType::FieldIterator::Next() called when "
"StructType::FieldIterator::HasNext() returns false");
}
return descriptor_.field(index_++)->number();
}
private:
const google::protobuf::Descriptor& descriptor_;
int index_ = 0;
};
size_t ProtoStructType::field_count() const {
return descriptor().field_count();
}
absl::StatusOr<UniqueRef<StructType::FieldIterator>>
ProtoStructType::NewFieldIterator(MemoryManager& memory_manager) const {
return MakeUnique<ProtoStructTypeFieldIterator>(memory_manager, descriptor());
}
absl::StatusOr<absl::optional<ProtoStructType::Field>>
ProtoStructType::FindFieldByName(TypeManager& type_manager,
absl::string_view name) const {
const auto* field_desc = descriptor().FindFieldByName(name);
if (ABSL_PREDICT_FALSE(field_desc == nullptr)) {
return absl::nullopt;
}
CEL_ASSIGN_OR_RETURN(auto type,
FieldDescriptorToType(type_manager, field_desc));
return Field(MakeFieldId(field_desc->number()), field_desc->name(),
field_desc->number(), std::move(type), field_desc);
}
absl::StatusOr<absl::optional<ProtoStructType::Field>>
ProtoStructType::FindFieldByNumber(TypeManager& type_manager,
int64_t number) const {
if (ABSL_PREDICT_FALSE(number < std::numeric_limits<int>::min() ||
number > std::numeric_limits<int>::max())) {
// Treat it as not found.
return absl::nullopt;
}
const auto* field_desc =
descriptor().FindFieldByNumber(static_cast<int>(number));
if (ABSL_PREDICT_FALSE(field_desc == nullptr)) {
return absl::nullopt;
}
CEL_ASSIGN_OR_RETURN(auto type,
FieldDescriptorToType(type_manager, field_desc));
return Field(MakeFieldId(field_desc->number()), field_desc->name(),
field_desc->number(), std::move(type), field_desc);
}
} // namespace cel::extensions