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//
//
// Copyright 2020 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_client.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/server.h"
namespace grpc_core {
namespace {
class XdsServerConfigFetcher : public grpc_server_config_fetcher {
public:
explicit XdsServerConfigFetcher(RefCountedPtr<XdsClient> xds_client)
: xds_client_(std::move(xds_client)) {
GPR_ASSERT(xds_client_ != nullptr);
}
void StartWatch(std::string listening_address,
std::unique_ptr<grpc_server_config_fetcher::WatcherInterface>
watcher) override {
grpc_server_config_fetcher::WatcherInterface* watcher_ptr = watcher.get();
auto listener_watcher =
absl::make_unique<ListenerWatcher>(std::move(watcher));
auto* listener_watcher_ptr = listener_watcher.get();
// TODO(yashykt): Get the resource name id from bootstrap
xds_client_->WatchListenerData(
absl::StrCat("grpc/server?xds.resource.listening_address=",
listening_address),
std::move(listener_watcher));
MutexLock lock(&mu_);
auto& watcher_state = watchers_[watcher_ptr];
watcher_state.listening_address = listening_address;
watcher_state.listener_watcher = listener_watcher_ptr;
}
void CancelWatch(
grpc_server_config_fetcher::WatcherInterface* watcher) override {
MutexLock lock(&mu_);
auto it = watchers_.find(watcher);
if (it != watchers_.end()) {
// Cancel the watch on the listener before erasing
xds_client_->CancelListenerDataWatch(it->second.listening_address,
it->second.listener_watcher,
false /* delay_unsubscription */);
watchers_.erase(it);
}
}
// Return the interested parties from the xds client so that it can be polled.
grpc_pollset_set* interested_parties() override {
return xds_client_->interested_parties();
}
private:
class ListenerWatcher : public XdsClient::ListenerWatcherInterface {
public:
explicit ListenerWatcher(
std::unique_ptr<grpc_server_config_fetcher::WatcherInterface>
server_config_watcher)
: server_config_watcher_(std::move(server_config_watcher)) {}
void OnListenerChanged(XdsApi::LdsUpdate listener) override {
// TODO(yashykt): Construct channel args according to received update
server_config_watcher_->UpdateConfig(nullptr);
}
void OnError(grpc_error* error) override {
gpr_log(GPR_ERROR, "ListenerWatcher:%p XdsClient reports error: %s", this,
grpc_error_string(error));
GRPC_ERROR_UNREF(error);
// TODO(yashykt): We might want to bubble this error to the application.
}
void OnResourceDoesNotExist() override {
gpr_log(GPR_ERROR,
"ListenerWatcher:%p XdsClient reports requested listener does "
"not exist",
this);
// TODO(yashykt): We might want to bubble this error to the application.
}
private:
std::unique_ptr<grpc_server_config_fetcher::WatcherInterface>
server_config_watcher_;
};
struct WatcherState {
std::string listening_address;
ListenerWatcher* listener_watcher = nullptr;
};
RefCountedPtr<XdsClient> xds_client_;
Mutex mu_;
std::map<grpc_server_config_fetcher::WatcherInterface*, WatcherState>
watchers_;
};
} // namespace
} // namespace grpc_core
grpc_server_config_fetcher* grpc_server_config_fetcher_xds_create() {
grpc_core::ApplicationCallbackExecCtx callback_exec_ctx;
grpc_core::ExecCtx exec_ctx;
GRPC_API_TRACE("grpc_server_config_fetcher_xds_create()", 0, ());
grpc_error* error = GRPC_ERROR_NONE;
grpc_core::RefCountedPtr<grpc_core::XdsClient> xds_client =
grpc_core::XdsClient::GetOrCreate(&error);
if (error != GRPC_ERROR_NONE) {
gpr_log(GPR_ERROR, "Failed to create xds client: %s",
grpc_error_string(error));
return nullptr;
}
return new grpc_core::XdsServerConfigFetcher(std::move(xds_client));
}
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