dm_conversation.cpp

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/* Diagnostic Client library
 * Copyright (C) 2024  Avijit Dey
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#include "diag-client/dcm/conversation/dm_conversation.h"
 
#include "diag-client/common/logger.h"
#include "diag-client/dcm/service/dm_uds_message.h"
#include "uds_transport/conversation_handler.h"
 
namespace diag {
namespace client {
namespace conversation {
 
class DmConversationHandler final : public ::uds_transport::ConversionHandler {
 public:
  DmConversationHandler(::uds_transport::conversion_manager::ConversionHandlerID handler_id,
                        DmConversation &dm_conversion)
      : uds_transport::ConversionHandler{handler_id},
        dm_conversation_{dm_conversion} {}
 
  DmConversationHandler(const DmConversationHandler &other) noexcept = delete;
  DmConversationHandler &operator=(const DmConversationHandler &other) noexcept = delete;
 
  DmConversationHandler(DmConversationHandler &&other) noexcept = delete;
  DmConversationHandler &operator=(DmConversationHandler &&other) noexcept = delete;
 
  ~DmConversationHandler() override = default;
 
  std::pair<::uds_transport::UdsTransportProtocolMgr::IndicationResult,
            ::uds_transport::UdsMessagePtr>
  IndicateMessage(::uds_transport::UdsMessage::Address source_addr,
                  ::uds_transport::UdsMessage::Address target_addr,
                  ::uds_transport::UdsMessage::TargetAddressType type,
                  ::uds_transport::ChannelID channel_id, std::size_t size,
                  ::uds_transport::Priority priority, ::uds_transport::ProtocolKind protocol_kind,
                  core_type::Span<std::uint8_t const> payload_info) const noexcept override {
    return (dm_conversation_.IndicateMessage(source_addr, target_addr, type, channel_id, size,
                                             priority, protocol_kind, payload_info));
  }
 
  void HandleMessage(::uds_transport::UdsMessagePtr message) const noexcept override {
    dm_conversation_.HandleMessage(std::move(message));
  }
 
 private:
  DmConversation &dm_conversation_;
};
 
DmConversation::DmConversation(std::string_view conversion_name,
                               DMConversationType &conversion_identifier)
    : Conversation{},
      active_session_{SessionControlType::kDefaultSession},
      active_security_level_{SecurityLevelType::kLocked},
      rx_buffer_size_{conversion_identifier.rx_buffer_size},
      p2_client_max_{conversion_identifier.p2_client_max},
      p2_star_client_max_{conversion_identifier.p2_star_client_max},
      source_address_{conversion_identifier.source_address},
      target_address_{},
      conversation_name_{conversion_name},
      dm_conversion_handler_{
          std::make_unique<DmConversationHandler>(conversion_identifier.handler_id, *this)} {}
 
DmConversation::~DmConversation() = default;
 
void DmConversation::Startup() noexcept {
  // initialize the connection
  static_cast<void>(connection_->Initialize());
  // start the connection
  connection_->Start();
  // Change the state to Active
  activity_status_ = ActivityStatusType::kActive;
  logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
      FILE_NAME, __LINE__, __func__, [&](std::stringstream &msg) {
        msg << "'" << conversation_name_ << "'"
            << "-> "
            << "Startup completed";
      });
}
 
void DmConversation::Shutdown() noexcept {
  if (GetActivityStatus() == ActivityStatusType::kActive) {
    // shutdown connection
    connection_->Stop();
    // Change the state to InActive
    activity_status_ = ActivityStatusType::kInactive;
    logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
        FILE_NAME, __LINE__, __func__, [&](std::stringstream &msg) {
          msg << "'" << conversation_name_ << "'"
              << "-> "
              << "Shutdown completed";
        });
  }
}
 
DiagClientConversation::ConnectResult DmConversation::ConnectToDiagServer(
    std::uint16_t const target_address, IpAddress const host_ip_addr) noexcept {
  // create an uds message just to get the port number
  // source address required for Routing Activation
  uds_transport::ByteVector payload{};  // empty payload
  // Send Connect request to doip layer
  DiagClientConversation::ConnectResult const connection_result{
      static_cast<DiagClientConversation::ConnectResult>(
          connection_->ConnectToHost(std::make_unique<diag::client::uds_message::DmUdsMessage>(
              source_address_, target_address, host_ip_addr, payload)))};
  remote_address_ = host_ip_addr;
  target_address_ = target_address;
  if (connection_result == DiagClientConversation::ConnectResult::kConnectSuccess) {
    logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
        FILE_NAME, __LINE__, __func__, [this](std::stringstream &msg) {
          msg << "'" << conversation_name_ << "'"
              << "-> "
              << "Successfully connected to Server with IP <" << remote_address_ << ">"
              << " and LA= 0x" << std::hex << target_address_;
        });
  } else {
    logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogError(
        FILE_NAME, __LINE__, __func__, [this](std::stringstream &msg) {
          msg << "'" << conversation_name_ << "'"
              << "-> "
              << "Failed connecting to Server with IP <" << remote_address_ << ">"
              << " and LA= 0x" << std::hex << target_address_;
        });
  }
  return connection_result;
}
 
DiagClientConversation::DisconnectResult DmConversation::DisconnectFromDiagServer() noexcept {
  DiagClientConversation::DisconnectResult ret_val{
      DiagClientConversation::DisconnectResult::kDisconnectFailed};
  // Check if already connected before disconnecting
  if (connection_->IsConnectToHost()) {
    // Send disconnect request to doip layer
    ret_val =
        static_cast<DiagClientConversation::DisconnectResult>(connection_->DisconnectFromHost());
    if (ret_val == DiagClientConversation::DisconnectResult::kDisconnectSuccess) {
      logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
          FILE_NAME, __LINE__, __func__, [this](std::stringstream &msg) {
            msg << "'" << conversation_name_ << "'"
                << "-> "
                << "Successfully disconnected from Server with IP <" << remote_address_ << ">"
                << " and LA= 0x" << std::hex << target_address_;
          });
    } else {
      logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogWarn(
          FILE_NAME, __LINE__, __func__, [&](std::stringstream &msg) {
            msg << "'" << conversation_name_ << "'"
                << "-> "
                << "Failed to disconnect from Server with IP <" << remote_address_ << ">";
          });
    }
  } else {
    ret_val = DiagClientConversation::DisconnectResult::kAlreadyDisconnected;
  }
  return ret_val;
}
 
Result<uds_message::UdsResponseMessagePtr, DiagClientConversation::DiagError>
DmConversation::SendDiagnosticRequest(uds_message::UdsRequestMessageConstPtr message) noexcept {
  Result<uds_message::UdsResponseMessagePtr, DiagClientConversation::DiagError> result{
      Result<uds_message::UdsResponseMessagePtr, DiagClientConversation::DiagError>::FromError(
          DiagClientConversation::DiagError::kDiagRequestSendFailed)};
  if (message) {
    // fill the data
    uds_transport::ByteVector payload{message->GetPayload()};
    // Initiate Sending of diagnostic request
    uds_transport::UdsTransportProtocolMgr::TransmissionResult const transmission_result{
        connection_->Transmit(std::make_unique<diag::client::uds_message::DmUdsMessage>(
            source_address_, target_address_, message->GetHostIpAddress(), payload))};
    if (transmission_result ==
        uds_transport::UdsTransportProtocolMgr::TransmissionResult::kTransmitOk) {
      // Diagnostic Request Sent successful
      logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
          FILE_NAME, __LINE__, __func__, [&](std::stringstream &msg) {
            msg << "'" << conversation_name_ << "'"
                << "-> "
                << "Diagnostic Request Sent & Positive Ack received";
          });
      conversation_state_.GetConversationStateContext().TransitionTo(
          ConversationState::kDiagWaitForRes);
      // Wait P6Max / P2ClientMax
      sync_timer_.WaitForTimeout(
          [this, &result]() {
            result.EmplaceError(DiagClientConversation::DiagError::kDiagResponseTimeout);
            conversation_state_.GetConversationStateContext().TransitionTo(
                ConversationState::kIdle);
            logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
                FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
                  msg << "'" << conversation_name_ << "'"
                      << "-> "
                      << "Diagnostic Response P2 Timeout happened after " << p2_client_max_
                      << " milliseconds";
                });
          },
          [this]() {
            // pending or pos/neg response
            if (conversation_state_.GetConversationStateContext().GetActiveState().GetState() ==
                ConversationState::kDiagRecvdFinalRes) {
              // pos/neg response received
            } else if (conversation_state_.GetConversationStateContext()
                           .GetActiveState()
                           .GetState() == ConversationState::kDiagRecvdPendingRes) {
              // first pending received
              conversation_state_.GetConversationStateContext().TransitionTo(
                  ConversationState::kDiagStartP2StarTimer);
            }
          },
          std::chrono::milliseconds{p2_client_max_});
 
      // Wait until final response or timeout
      while (conversation_state_.GetConversationStateContext().GetActiveState().GetState() !=
             ConversationState::kIdle) {
        // Check the active state
        switch (conversation_state_.GetConversationStateContext().GetActiveState().GetState()) {
          case ConversationState::kDiagRecvdPendingRes:
            conversation_state_.GetConversationStateContext().TransitionTo(
                ConversationState::kDiagStartP2StarTimer);
            break;
          case ConversationState::kDiagRecvdFinalRes:
            // do nothing
            break;
          case ConversationState::kDiagStartP2StarTimer:
            // wait P6Star/ P2 star client time
            sync_timer_.WaitForTimeout(
                [this, &result]() {
                  logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
                      FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
                        msg << "'" << conversation_name_ << "'"
                            << "-> "
                            << "Diagnostic Response P2 Star Timeout "
                               "happened after "
                            << p2_star_client_max_ << " milliseconds";
                      });
                  result.EmplaceError(DiagClientConversation::DiagError::kDiagResponseTimeout);
                  conversation_state_.GetConversationStateContext().TransitionTo(
                      ConversationState::kIdle);
                },
                [this]() {
                  // pending or pos/neg response
                  if (conversation_state_.GetConversationStateContext()
                          .GetActiveState()
                          .GetState() == ConversationState::kDiagRecvdFinalRes) {
                    // pos/neg response received
                  } else if (conversation_state_.GetConversationStateContext()
                                 .GetActiveState()
                                 .GetState() == ConversationState::kDiagRecvdPendingRes) {
                    // pending received again
                    conversation_state_.GetConversationStateContext().TransitionTo(
                        ConversationState::kDiagStartP2StarTimer);
                  }
                },
                std::chrono::milliseconds{p2_star_client_max_});
            break;
          case ConversationState::kDiagSuccess:
            // change state to idle, form the uds response and return
            result.EmplaceValue(
                std::make_unique<diag::client::uds_message::DmUdsResponse>(payload_rx_buffer_));
            conversation_state_.GetConversationStateContext().TransitionTo(
                ConversationState::kIdle);
            break;
          default:
            // nothing
            break;
        }
      }
    } else {
      // failure
      result.EmplaceError(ConvertResponseType(transmission_result));
    }
  } else {
    result.EmplaceError(DiagClientConversation::DiagError::kDiagInvalidParameter);
    logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogWarn(
        FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
          msg << "'" << conversation_name_ << "'"
              << "-> "
              << "Diagnostic Request message is empty";
        });
  }
  return result;
}
 
void DmConversation::RegisterConnection(
    std::unique_ptr<uds_transport::Connection> connection) noexcept {
  connection_ = std::move(connection);
}
 
::uds_transport::ConversionHandler &DmConversation::GetConversationHandler() noexcept {
  return *dm_conversion_handler_;
}
 
std::pair<uds_transport::UdsTransportProtocolMgr::IndicationResult, uds_transport::UdsMessagePtr>
DmConversation::IndicateMessage(uds_transport::UdsMessage::Address,
                                uds_transport::UdsMessage::Address,
                                uds_transport::UdsMessage::TargetAddressType,
                                uds_transport::ChannelID, std::size_t size, uds_transport::Priority,
                                uds_transport::ProtocolKind,
                                core_type::Span<std::uint8_t const> payload_info) noexcept {
  std::pair<uds_transport::UdsTransportProtocolMgr::IndicationResult, uds_transport::UdsMessagePtr>
      ret_val{uds_transport::UdsTransportProtocolMgr::IndicationResult::kIndicationNOk, nullptr};
  // Verify the payload received :-
  if (!payload_info.empty()) {
    // Check for size, else kIndicationOverflow
    if (size <= rx_buffer_size_) {
      // Check for pending response
      // payload = 0x7F XX 0x78
      if (payload_info[0U] == 0x7F && payload_info[2U] == 0x78) {
        logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogInfo(
            FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
              msg << "'" << conversation_name_ << "'"
                  << "-> "
                  << "Diagnostic pending response received in Conversation";
            });
        ret_val.first =
            uds_transport::UdsTransportProtocolMgr::IndicationResult::kIndicationPending;
        conversation_state_.GetConversationStateContext().TransitionTo(
            ConversationState::kDiagRecvdPendingRes);
      } else {
        logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogDebug(
            FILE_NAME, __LINE__, "", [this](std::stringstream &msg) {
              msg << "'" << conversation_name_ << "'"
                  << "-> "
                  << "Diagnostic final response received in Conversation";
            });
        // positive or negative response, provide valid buffer
        // resize the global rx buffer
        payload_rx_buffer_.resize(size);
        ret_val.first = uds_transport::UdsTransportProtocolMgr::IndicationResult::kIndicationOk;
        ret_val.second = std::make_unique<diag::client::uds_message::DmUdsMessage>(
            source_address_, target_address_, "", payload_rx_buffer_);
        conversation_state_.GetConversationStateContext().TransitionTo(
            ConversationState::kDiagRecvdFinalRes);
      }
      sync_timer_.CancelWait();
    } else {
      logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogError(
          FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
            msg << "'" << conversation_name_ << "'"
                << "-> "
                << "Diagnostic Conversation Error Indication Overflow";
          });
      ret_val.first = uds_transport::UdsTransportProtocolMgr::IndicationResult::kIndicationOverflow;
    }
  } else {
    logger::DiagClientLogger::GetDiagClientLogger().GetLogger().LogError(
        FILE_NAME, __LINE__, "", [&](std::stringstream &msg) {
          msg << "'" << conversation_name_ << "'"
              << "-> "
              << "Diagnostic Conversation Rx Payload size 0 received";
        });
  }
  return ret_val;
}
 
void DmConversation::HandleMessage(uds_transport::UdsMessagePtr message) noexcept {
  if (message != nullptr) {
    conversation_state_.GetConversationStateContext().TransitionTo(ConversationState::kDiagSuccess);
  }
}
 
DiagClientConversation::DiagError DmConversation::ConvertResponseType(
    uds_transport::UdsTransportProtocolMgr::TransmissionResult result_type) {
  DiagClientConversation::DiagError ret_result{
      DiagClientConversation::DiagError::kDiagGenericFailure};
  switch (result_type) {
    case uds_transport::UdsTransportProtocolMgr::TransmissionResult::kTransmitFailed:
      ret_result = DiagClientConversation::DiagError::kDiagRequestSendFailed;
      break;
    case uds_transport::UdsTransportProtocolMgr::TransmissionResult::kNoTransmitAckReceived:
      ret_result = DiagClientConversation::DiagError::kDiagAckTimeout;
      break;
    case uds_transport::UdsTransportProtocolMgr::TransmissionResult::kNegTransmitAckReceived:
      ret_result = DiagClientConversation::DiagError::kDiagNegAckReceived;
      break;
    case uds_transport::UdsTransportProtocolMgr::TransmissionResult::kBusyProcessing:
      ret_result = DiagClientConversation::DiagError::kDiagBusyProcessing;
      break;
    default:
      ret_result = DiagClientConversation::DiagError::kDiagGenericFailure;
      break;
  }
  return ret_result;
}
 
}  // namespace conversation
}  // namespace client
}  // namespace diag