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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.
*
*/
#include <memory>
#include <mutex>
#include <grpc/slice.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpcpp/impl/codegen/method_handler_impl.h>
#include "pb_decode.h"
#include "pb_encode.h"
#include "src/cpp/server/health/default_health_check_service.h"
#include "src/cpp/server/health/health.pb.h"
namespace grpc {
namespace {
const char kHealthCheckMethodName[] = "/grpc.health.v1.Health/Check";
} // namespace
DefaultHealthCheckService::HealthCheckServiceImpl::HealthCheckServiceImpl(
DefaultHealthCheckService* service)
: service_(service), method_(nullptr) {
internal::MethodHandler* handler =
new internal::RpcMethodHandler<HealthCheckServiceImpl, ByteBuffer,
ByteBuffer>(
std::mem_fn(&HealthCheckServiceImpl::Check), this);
method_ = new internal::RpcServiceMethod(
kHealthCheckMethodName, internal::RpcMethod::NORMAL_RPC, handler);
AddMethod(method_);
}
Status DefaultHealthCheckService::HealthCheckServiceImpl::Check(
ServerContext* context, const ByteBuffer* request, ByteBuffer* response) {
// Decode request.
std::vector<Slice> slices;
if (!request->Dump(&slices).ok()) {
return Status(StatusCode::INVALID_ARGUMENT, "");
}
uint8_t* request_bytes = nullptr;
bool request_bytes_owned = false;
size_t request_size = 0;
grpc_health_v1_HealthCheckRequest request_struct;
if (slices.empty()) {
request_struct.has_service = false;
} else if (slices.size() == 1) {
request_bytes = const_cast<uint8_t*>(slices[0].begin());
request_size = slices[0].size();
} else {
request_bytes_owned = true;
request_bytes = static_cast<uint8_t*>(gpr_malloc(request->Length()));
uint8_t* copy_to = request_bytes;
for (size_t i = 0; i < slices.size(); i++) {
memcpy(copy_to, slices[i].begin(), slices[i].size());
copy_to += slices[i].size();
}
}
if (request_bytes != nullptr) {
pb_istream_t istream = pb_istream_from_buffer(request_bytes, request_size);
bool decode_status = pb_decode(
&istream, grpc_health_v1_HealthCheckRequest_fields, &request_struct);
if (request_bytes_owned) {
gpr_free(request_bytes);
}
if (!decode_status) {
return Status(StatusCode::INVALID_ARGUMENT, "");
}
}
// Check status from the associated default health checking service.
DefaultHealthCheckService::ServingStatus serving_status =
service_->GetServingStatus(
request_struct.has_service ? request_struct.service : "");
if (serving_status == DefaultHealthCheckService::NOT_FOUND) {
return Status(StatusCode::NOT_FOUND, "");
}
// Encode response
grpc_health_v1_HealthCheckResponse response_struct;
response_struct.has_status = true;
response_struct.status =
serving_status == DefaultHealthCheckService::SERVING
? grpc_health_v1_HealthCheckResponse_ServingStatus_SERVING
: grpc_health_v1_HealthCheckResponse_ServingStatus_NOT_SERVING;
pb_ostream_t ostream;
memset(&ostream, 0, sizeof(ostream));
pb_encode(&ostream, grpc_health_v1_HealthCheckResponse_fields,
&response_struct);
grpc_slice response_slice = grpc_slice_malloc(ostream.bytes_written);
ostream = pb_ostream_from_buffer(GRPC_SLICE_START_PTR(response_slice),
GRPC_SLICE_LENGTH(response_slice));
bool encode_status = pb_encode(
&ostream, grpc_health_v1_HealthCheckResponse_fields, &response_struct);
if (!encode_status) {
return Status(StatusCode::INTERNAL, "Failed to encode response.");
}
Slice encoded_response(response_slice, Slice::STEAL_REF);
ByteBuffer response_buffer(&encoded_response, 1);
response->Swap(&response_buffer);
return Status::OK;
}
DefaultHealthCheckService::DefaultHealthCheckService() {
services_map_.emplace("", true);
}
void DefaultHealthCheckService::SetServingStatus(
const grpc::string& service_name, bool serving) {
std::lock_guard<std::mutex> lock(mu_);
services_map_[service_name] = serving;
}
void DefaultHealthCheckService::SetServingStatus(bool serving) {
std::lock_guard<std::mutex> lock(mu_);
for (auto iter = services_map_.begin(); iter != services_map_.end(); ++iter) {
iter->second = serving;
}
}
DefaultHealthCheckService::ServingStatus
DefaultHealthCheckService::GetServingStatus(
const grpc::string& service_name) const {
std::lock_guard<std::mutex> lock(mu_);
const auto& iter = services_map_.find(service_name);
if (iter == services_map_.end()) {
return NOT_FOUND;
}
return iter->second ? SERVING : NOT_SERVING;
}
DefaultHealthCheckService::HealthCheckServiceImpl*
DefaultHealthCheckService::GetHealthCheckService() {
GPR_ASSERT(impl_ == nullptr);
impl_.reset(new HealthCheckServiceImpl(this));
return impl_.get();
}
} // namespace grpc
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