/*
 *
 * Copyright 2018 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/cpp/server/channelz/channelz_service.h"

#include <grpc/grpc.h>
#include <grpc/support/alloc.h>

namespace grpc {

namespace {

grpc::protobuf::util::Status ParseJson(const char* json_str,
                                       grpc::protobuf::Message* message) {
  grpc::protobuf::json::JsonParseOptions options;
  options.case_insensitive_enum_parsing = true;
  return grpc::protobuf::json::JsonStringToMessage(json_str, message, options);
}

}  // namespace

Status ChannelzService::GetTopChannels(
    ServerContext* /*unused*/,
    const channelz::v1::GetTopChannelsRequest* request,
    channelz::v1::GetTopChannelsResponse* response) {
  char* json_str = grpc_channelz_get_top_channels(request->start_channel_id());
  if (json_str == nullptr) {
    return Status(StatusCode::INTERNAL,
                  "grpc_channelz_get_top_channels returned null");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetServers(
    ServerContext* /*unused*/, const channelz::v1::GetServersRequest* request,
    channelz::v1::GetServersResponse* response) {
  char* json_str = grpc_channelz_get_servers(request->start_server_id());
  if (json_str == nullptr) {
    return Status(StatusCode::INTERNAL,
                  "grpc_channelz_get_servers returned null");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetServer(ServerContext* /*unused*/,
                                  const channelz::v1::GetServerRequest* request,
                                  channelz::v1::GetServerResponse* response) {
  char* json_str = grpc_channelz_get_server(request->server_id());
  if (json_str == nullptr) {
    return Status(StatusCode::INTERNAL,
                  "grpc_channelz_get_server returned null");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetServerSockets(
    ServerContext* /*unused*/,
    const channelz::v1::GetServerSocketsRequest* request,
    channelz::v1::GetServerSocketsResponse* response) {
  char* json_str = grpc_channelz_get_server_sockets(
      request->server_id(), request->start_socket_id(), request->max_results());
  if (json_str == nullptr) {
    return Status(StatusCode::INTERNAL,
                  "grpc_channelz_get_server_sockets returned null");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetChannel(
    ServerContext* /*unused*/, const channelz::v1::GetChannelRequest* request,
    channelz::v1::GetChannelResponse* response) {
  char* json_str = grpc_channelz_get_channel(request->channel_id());
  if (json_str == nullptr) {
    return Status(StatusCode::NOT_FOUND, "No object found for that ChannelId");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetSubchannel(
    ServerContext* /*unused*/,
    const channelz::v1::GetSubchannelRequest* request,
    channelz::v1::GetSubchannelResponse* response) {
  char* json_str = grpc_channelz_get_subchannel(request->subchannel_id());
  if (json_str == nullptr) {
    return Status(StatusCode::NOT_FOUND,
                  "No object found for that SubchannelId");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

Status ChannelzService::GetSocket(ServerContext* /*unused*/,
                                  const channelz::v1::GetSocketRequest* request,
                                  channelz::v1::GetSocketResponse* response) {
  char* json_str = grpc_channelz_get_socket(request->socket_id());
  if (json_str == nullptr) {
    return Status(StatusCode::NOT_FOUND, "No object found for that SocketId");
  }
  grpc::protobuf::util::Status s = ParseJson(json_str, response);
  gpr_free(json_str);
  if (!s.ok()) {
    return Status(StatusCode::INTERNAL, s.ToString());
  }
  return Status::OK;
}

}  // namespace grpc
