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//
//
// Copyright 2016 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.
//
//
#ifndef GRPC_SRC_CPP_SERVER_HEALTH_DEFAULT_HEALTH_CHECK_SERVICE_H
#define GRPC_SRC_CPP_SERVER_HEALTH_DEFAULT_HEALTH_CHECK_SERVICE_H
#include <stddef.h>
#include <map>
#include <memory>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include "y_absl/base/thread_annotations.h"
#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#include <grpcpp/impl/service_type.h>
#include <grpcpp/impl/sync.h>
#include <grpcpp/support/byte_buffer.h>
#include <grpcpp/support/server_callback.h>
#include <grpcpp/support/status.h>
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
namespace grpc {
// Default implementation of HealthCheckServiceInterface. Server will create and
// own it.
class DefaultHealthCheckService final : public HealthCheckServiceInterface {
public:
enum ServingStatus { NOT_FOUND, SERVING, NOT_SERVING };
// The service impl to register with the server.
class HealthCheckServiceImpl : public Service {
public:
// Reactor for handling Watch streams.
class WatchReactor : public ServerWriteReactor<ByteBuffer>,
public grpc_core::RefCounted<WatchReactor> {
public:
WatchReactor(HealthCheckServiceImpl* service, const ByteBuffer* request);
void SendHealth(ServingStatus status);
void OnWriteDone(bool ok) override;
void OnCancel() override;
void OnDone() override;
private:
void SendHealthLocked(ServingStatus status)
Y_ABSL_EXCLUSIVE_LOCKS_REQUIRED(&mu_);
void MaybeFinishLocked(Status status) Y_ABSL_EXCLUSIVE_LOCKS_REQUIRED(&mu_);
HealthCheckServiceImpl* service_;
TString service_name_;
ByteBuffer response_;
grpc::internal::Mutex mu_;
bool write_pending_ Y_ABSL_GUARDED_BY(mu_) = false;
ServingStatus pending_status_ Y_ABSL_GUARDED_BY(mu_) = NOT_FOUND;
bool finish_called_ Y_ABSL_GUARDED_BY(mu_) = false;
};
explicit HealthCheckServiceImpl(DefaultHealthCheckService* database);
~HealthCheckServiceImpl() override;
private:
// Request handler for Check method.
static ServerUnaryReactor* HandleCheckRequest(
DefaultHealthCheckService* database, CallbackServerContext* context,
const ByteBuffer* request, ByteBuffer* response);
// Returns true on success.
static bool DecodeRequest(const ByteBuffer& request,
TString* service_name);
static bool EncodeResponse(ServingStatus status, ByteBuffer* response);
DefaultHealthCheckService* database_;
grpc::internal::Mutex mu_;
grpc::internal::CondVar shutdown_condition_;
bool shutdown_ Y_ABSL_GUARDED_BY(mu_) = false;
size_t num_watches_ Y_ABSL_GUARDED_BY(mu_) = 0;
};
DefaultHealthCheckService();
void SetServingStatus(const TString& service_name, bool serving) override;
void SetServingStatus(bool serving) override;
void Shutdown() override;
ServingStatus GetServingStatus(const TString& service_name) const;
HealthCheckServiceImpl* GetHealthCheckService();
private:
// Stores the current serving status of a service and any call
// handlers registered for updates when the service's status changes.
class ServiceData {
public:
void SetServingStatus(ServingStatus status);
ServingStatus GetServingStatus() const { return status_; }
void AddWatch(
grpc_core::RefCountedPtr<HealthCheckServiceImpl::WatchReactor> watcher);
void RemoveWatch(HealthCheckServiceImpl::WatchReactor* watcher);
bool Unused() const { return watchers_.empty() && status_ == NOT_FOUND; }
private:
ServingStatus status_ = NOT_FOUND;
std::map<HealthCheckServiceImpl::WatchReactor*,
grpc_core::RefCountedPtr<HealthCheckServiceImpl::WatchReactor>>
watchers_;
};
void RegisterWatch(
const TString& service_name,
grpc_core::RefCountedPtr<HealthCheckServiceImpl::WatchReactor> watcher);
void UnregisterWatch(const TString& service_name,
HealthCheckServiceImpl::WatchReactor* watcher);
mutable grpc::internal::Mutex mu_;
bool shutdown_ Y_ABSL_GUARDED_BY(&mu_) = false;
std::map<TString, ServiceData> services_map_ Y_ABSL_GUARDED_BY(&mu_);
std::unique_ptr<HealthCheckServiceImpl> impl_;
};
} // namespace grpc
#endif // GRPC_SRC_CPP_SERVER_HEALTH_DEFAULT_HEALTH_CHECK_SERVICE_H
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