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evaluator.cc
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evaluator.cc
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#include "source/extensions/filters/common/expr/evaluator.h"
#include "envoy/common/exception.h"
#include "envoy/singleton/manager.h"
#include "eval/public/builtin_func_registrar.h"
#include "eval/public/cel_expr_builder_factory.h"
namespace Envoy {
namespace Extensions {
namespace Filters {
namespace Common {
namespace Expr {
namespace {
#define ACTIVATION_TOKENS(_f) \
_f(Request) _f(Response) _f(Connection) _f(Upstream) _f(Source) _f(Destination) _f(Metadata) \
_f(FilterState) _f(XDS) _f(UpstreamFilterState)
#define _DECLARE(_t) _t,
enum class ActivationToken { ACTIVATION_TOKENS(_DECLARE) };
#undef _DECLARE
using ActivationLookupTable = absl::flat_hash_map<absl::string_view, ActivationToken>;
#define _PAIR(_t) {_t, ActivationToken::_t},
const ActivationLookupTable& getActivationTokens() {
CONSTRUCT_ON_FIRST_USE(ActivationLookupTable, {ACTIVATION_TOKENS(_PAIR)});
#undef _PAIR
}
} // namespace
absl::optional<CelValue> StreamActivation::FindValue(absl::string_view name,
Protobuf::Arena* arena) const {
const auto& tokens = getActivationTokens();
const auto token = tokens.find(name);
if (token == tokens.end()) {
return {};
}
if (token->second == ActivationToken::XDS) {
return CelValue::CreateMap(
Protobuf::Arena::Create<XDSWrapper>(arena, *arena, activation_info_, local_info_));
}
if (activation_info_ == nullptr) {
return {};
}
const StreamInfo::StreamInfo& info = *activation_info_;
switch (token->second) {
case ActivationToken::Request:
return CelValue::CreateMap(
Protobuf::Arena::Create<RequestWrapper>(arena, *arena, activation_request_headers_, info));
case ActivationToken::Response:
return CelValue::CreateMap(Protobuf::Arena::Create<ResponseWrapper>(
arena, *arena, activation_response_headers_, activation_response_trailers_, info));
case ActivationToken::Connection:
return CelValue::CreateMap(Protobuf::Arena::Create<ConnectionWrapper>(arena, *arena, info));
case ActivationToken::Upstream:
return CelValue::CreateMap(Protobuf::Arena::Create<UpstreamWrapper>(arena, *arena, info));
case ActivationToken::Source:
return CelValue::CreateMap(Protobuf::Arena::Create<PeerWrapper>(arena, *arena, info, false));
case ActivationToken::Destination:
return CelValue::CreateMap(Protobuf::Arena::Create<PeerWrapper>(arena, *arena, info, true));
case ActivationToken::Metadata:
return CelProtoWrapper::CreateMessage(&info.dynamicMetadata(), arena);
case ActivationToken::FilterState:
return CelValue::CreateMap(
Protobuf::Arena::Create<FilterStateWrapper>(arena, *arena, info.filterState()));
case ActivationToken::XDS:
return {};
case ActivationToken::UpstreamFilterState:
if (info.upstreamInfo().has_value() &&
info.upstreamInfo().value().get().upstreamFilterState() != nullptr) {
return CelValue::CreateMap(Protobuf::Arena::Create<FilterStateWrapper>(
arena, *arena, *info.upstreamInfo().value().get().upstreamFilterState()));
}
}
return {};
}
void StreamActivation::resetActivation() const {
local_info_ = nullptr;
activation_info_ = nullptr;
activation_request_headers_ = nullptr;
activation_response_headers_ = nullptr;
activation_response_trailers_ = nullptr;
}
ActivationPtr createActivation(const LocalInfo::LocalInfo* local_info,
const StreamInfo::StreamInfo& info,
const Http::RequestHeaderMap* request_headers,
const Http::ResponseHeaderMap* response_headers,
const Http::ResponseTrailerMap* response_trailers) {
return std::make_unique<StreamActivation>(local_info, info, request_headers, response_headers,
response_trailers);
}
BuilderPtr createBuilder(Protobuf::Arena* arena) {
ASSERT_IS_MAIN_OR_TEST_THREAD();
google::api::expr::runtime::InterpreterOptions options;
// Security-oriented defaults
options.enable_comprehension = false;
options.enable_regex = true;
options.regex_max_program_size = 100;
options.enable_string_conversion = false;
options.enable_string_concat = false;
options.enable_list_concat = false;
// Enable constant folding (performance optimization)
if (arena != nullptr) {
options.constant_folding = true;
options.constant_arena = arena;
}
auto builder = google::api::expr::runtime::CreateCelExpressionBuilder(options);
auto register_status =
google::api::expr::runtime::RegisterBuiltinFunctions(builder->GetRegistry(), options);
if (!register_status.ok()) {
throw CelException(
absl::StrCat("failed to register built-in functions: ", register_status.message()));
}
return builder;
}
SINGLETON_MANAGER_REGISTRATION(expression_builder);
BuilderInstanceSharedPtr getBuilder(Server::Configuration::CommonFactoryContext& context) {
return context.singletonManager().getTyped<BuilderInstance>(
SINGLETON_MANAGER_REGISTERED_NAME(expression_builder),
[] { return std::make_shared<BuilderInstance>(createBuilder(nullptr)); });
}
ExpressionPtr createExpression(Builder& builder, const google::api::expr::v1alpha1::Expr& expr) {
google::api::expr::v1alpha1::SourceInfo source_info;
auto cel_expression_status = builder.CreateExpression(&expr, &source_info);
if (!cel_expression_status.ok()) {
throw CelException(
absl::StrCat("failed to create an expression: ", cel_expression_status.status().message()));
}
return std::move(cel_expression_status.value());
}
absl::optional<CelValue> evaluate(const Expression& expr, Protobuf::Arena& arena,
const LocalInfo::LocalInfo* local_info,
const StreamInfo::StreamInfo& info,
const Http::RequestHeaderMap* request_headers,
const Http::ResponseHeaderMap* response_headers,
const Http::ResponseTrailerMap* response_trailers) {
auto activation =
createActivation(local_info, info, request_headers, response_headers, response_trailers);
auto eval_status = expr.Evaluate(*activation, &arena);
if (!eval_status.ok()) {
return {};
}
return eval_status.value();
}
bool matches(const Expression& expr, const StreamInfo::StreamInfo& info,
const Http::RequestHeaderMap& headers) {
Protobuf::Arena arena;
auto eval_status = Expr::evaluate(expr, arena, nullptr, info, &headers, nullptr, nullptr);
if (!eval_status.has_value()) {
return false;
}
auto result = eval_status.value();
return result.IsBool() ? result.BoolOrDie() : false;
}
std::string print(CelValue value) {
switch (value.type()) {
case CelValue::Type::kBool:
return value.BoolOrDie() ? "true" : "false";
case CelValue::Type::kInt64:
return absl::StrCat(value.Int64OrDie());
case CelValue::Type::kUint64:
return absl::StrCat(value.Uint64OrDie());
case CelValue::Type::kDouble:
return absl::StrCat(value.DoubleOrDie());
case CelValue::Type::kString:
return std::string(value.StringOrDie().value());
case CelValue::Type::kBytes:
return std::string(value.BytesOrDie().value());
case CelValue::Type::kMessage:
return value.IsNull() ? "NULL" : value.MessageOrDie()->ShortDebugString();
case CelValue::Type::kDuration:
return absl::FormatDuration(value.DurationOrDie());
case CelValue::Type::kTimestamp:
return absl::FormatTime(value.TimestampOrDie(), absl::UTCTimeZone());
case CelValue::Type::kNullType:
return "NULL";
default:
return absl::StrCat(CelValue::TypeName(value.type()), " value");
}
}
} // namespace Expr
} // namespace Common
} // namespace Filters
} // namespace Extensions
} // namespace Envoy