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//
// Copyright 2021 gRPC authors.
//
// 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
//
// http://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 <grpc/support/port_platform.h>
#include "src/core/ext/xds/xds_http_filters.h"
#include "envoy/extensions/filters/http/router/v3/router.upb.h"
#include "envoy/extensions/filters/http/router/v3/router.upbdefs.h"
#include "src/core/ext/xds/xds_http_fault_filter.h"
namespace grpc_core {
const char* kXdsHttpRouterFilterConfigName =
"envoy.extensions.filters.http.router.v3.Router";
namespace {
class XdsHttpRouterFilter : public XdsHttpFilterImpl {
public:
void PopulateSymtab(upb_symtab* symtab) const override {
envoy_extensions_filters_http_router_v3_Router_getmsgdef(symtab);
}
absl::StatusOr<FilterConfig> GenerateFilterConfig(
upb_strview serialized_filter_config, upb_arena* arena) const override {
if (envoy_extensions_filters_http_router_v3_Router_parse(
serialized_filter_config.data, serialized_filter_config.size,
arena) == nullptr) {
return absl::InvalidArgumentError("could not parse router filter config");
}
return FilterConfig{kXdsHttpRouterFilterConfigName, Json()};
}
absl::StatusOr<FilterConfig> GenerateFilterConfigOverride(
upb_strview /*serialized_filter_config*/,
upb_arena* /*arena*/) const override {
return absl::InvalidArgumentError(
"router filter does not support config override");
}
// No-op -- this filter is special-cased by the xds resolver.
const grpc_channel_filter* channel_filter() const override { return nullptr; }
// No-op -- this filter is special-cased by the xds resolver.
absl::StatusOr<ServiceConfigJsonEntry> GenerateServiceConfig(
const FilterConfig& /*hcm_filter_config*/,
const FilterConfig* /*filter_config_override*/) const override {
return absl::UnimplementedError("router filter should never be called");
}
bool IsSupportedOnClients() const override { return true; }
bool IsSupportedOnServers() const override { return true; }
};
using FilterOwnerList = std::vector<std::unique_ptr<XdsHttpFilterImpl>>;
using FilterRegistryMap = std::map<absl::string_view, XdsHttpFilterImpl*>;
FilterOwnerList* g_filters = nullptr;
FilterRegistryMap* g_filter_registry = nullptr;
} // namespace
void XdsHttpFilterRegistry::RegisterFilter(
std::unique_ptr<XdsHttpFilterImpl> filter,
const std::set<absl::string_view>& config_proto_type_names) {
for (auto config_proto_type_name : config_proto_type_names) {
(*g_filter_registry)[config_proto_type_name] = filter.get();
}
g_filters->push_back(std::move(filter));
}
const XdsHttpFilterImpl* XdsHttpFilterRegistry::GetFilterForType(
absl::string_view proto_type_name) {
auto it = g_filter_registry->find(proto_type_name);
if (it == g_filter_registry->end()) return nullptr;
return it->second;
}
void XdsHttpFilterRegistry::PopulateSymtab(upb_symtab* symtab) {
for (const auto& filter : *g_filters) {
filter->PopulateSymtab(symtab);
}
}
void XdsHttpFilterRegistry::Init() {
g_filters = new FilterOwnerList;
g_filter_registry = new FilterRegistryMap;
RegisterFilter(absl::make_unique<XdsHttpRouterFilter>(),
{kXdsHttpRouterFilterConfigName});
RegisterFilter(absl::make_unique<XdsHttpFaultFilter>(),
{kXdsHttpFaultFilterConfigName});
}
void XdsHttpFilterRegistry::Shutdown() {
delete g_filter_registry;
delete g_filters;
}
} // namespace grpc_core
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