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connection between 2 systems and bug fixes (#14)
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tompzf
167
sdv_services/core/permission_control.cpp
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167
sdv_services/core/permission_control.cpp
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/********************************************************************************
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* Copyright (c) 2025-2026 ZF Friedrichshafen AG
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License Version 2.0 which is available at
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Contributors:
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* Erik Verhoeven - initial API and implementation
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********************************************************************************/
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#include "permission_control.h"
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#if defined __GNUC__ && defined _WIN32
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thread_local std::list<std::pair<sdv::core::EAccessPermission, size_t>>&
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CPermissionControl::m_lstPermissionTracker = CreatePermissionList();
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thread_local std::map<sdv::core::TPermissionID, CAccessPermission>&
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CPermissionControl::m_mapPermissions = CreatePermissionMap();
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#else
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thread_local std::list<std::pair<sdv::core::EAccessPermission, size_t>> CPermissionControl::m_lstPermissionTracker;
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thread_local std::map<sdv::core::TPermissionID, CAccessPermission> CPermissionControl::m_mapPermissions;
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#endif
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CPermissionControl& GetPermissionControl()
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{
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static CPermissionControl control;
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return control;
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}
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CAccessPermission::CAccessPermission(CPermissionControl& rPermissionControl, sdv::core::EAccessPermission ePermission) :
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m_rPermissionControl(rPermissionControl), m_ePermission(ePermission)
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{
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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rPermissionControl.IncrementPermissionCount(ePermission);
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}
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CAccessPermission::CAccessPermission(const CAccessPermission& rPermission) :
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m_rPermissionControl(rPermission.m_rPermissionControl), m_ePermission(rPermission.m_ePermission)
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{
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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m_rPermissionControl.IncrementPermissionCount(m_ePermission);
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}
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CAccessPermission::CAccessPermission(CAccessPermission&& rPermission) :
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m_rPermissionControl(rPermission.m_rPermissionControl), m_ePermission(rPermission.m_ePermission)
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{
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rPermission.m_ePermission = sdv::core::EAccessPermission::not_set;
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}
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CAccessPermission& CAccessPermission::operator=(const CAccessPermission& rPermission)
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{
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// Remove current permission and copy the new permission
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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m_rPermissionControl.DecrementPermissionCount(m_ePermission);
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m_ePermission = rPermission.m_ePermission;
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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m_rPermissionControl.IncrementPermissionCount(m_ePermission);
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return *this;
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}
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CAccessPermission& CAccessPermission::operator=(CAccessPermission && rPermission)
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{
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// Remove current permission and move the new permission
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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m_rPermissionControl.DecrementPermissionCount(m_ePermission);
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m_ePermission = rPermission.m_ePermission;
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rPermission.m_ePermission = sdv::core::EAccessPermission::not_set;
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return *this;
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}
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CAccessPermission ::~CAccessPermission()
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{
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if (m_ePermission != sdv::core::EAccessPermission::not_set)
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m_rPermissionControl.DecrementPermissionCount(m_ePermission);
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}
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sdv::core::EAccessPermission CAccessPermission::Permission() const
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{
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return m_ePermission;
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}
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sdv::core::TPermissionID CPermissionControl::RestrictAccessPermission(/*in*/ sdv::core::EAccessPermission ePermission)
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{
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// Unlike the CreateAccessPermission this function can only be used to restrict an already available restriction. It cannot be
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// used to set the initial restriction.
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if (m_lstPermissionTracker.empty()) return false;
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sdv::core::TPermissionID tPermissionID = m_idgen.Generate();
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if (!tPermissionID) return 0u;
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m_mapPermissions.emplace(tPermissionID, CreatePermissionObject(ePermission));
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return tPermissionID;
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}
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bool CPermissionControl::ReleaseAccessPermission(/*in*/ sdv::core::TPermissionID tPermissionID)
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{
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auto itPermission = m_mapPermissions.find(tPermissionID);
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if (itPermission == m_mapPermissions.end()) return false;
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m_mapPermissions.erase(itPermission);
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return true;
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}
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sdv::core::TPermissionTransferID CPermissionControl::TransferCurrentPermission()
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{
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std::unique_lock<std::mutex> lock(m_mtxPermissionTransfer);
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sdv::core::TPermissionTransferID tTransferID = m_idgen.Generate();
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m_mapPermissionTransfer[tTransferID] = GetCurrentPermission();
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return tTransferID;
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}
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sdv::core::TPermissionID CPermissionControl::SetAccessPermission(/*in*/ sdv::core::TPermissionTransferID tTransferID)
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{
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// Get the access restriction level from the transfer permission map.
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std::unique_lock<std::mutex> lock(m_mtxPermissionTransfer);
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auto itTransferPermission = m_mapPermissionTransfer.find(tTransferID);
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if (itTransferPermission == m_mapPermissionTransfer.end()) return 0u;
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sdv::core::EAccessPermission ePermission = itTransferPermission->second;
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m_mapPermissionTransfer.erase(itTransferPermission);
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// Unlike the RestrictAccessPermission function, the SetAccessPermission function can be used to set an initial permission.
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sdv::core::TPermissionID tPermissionID = m_idgen.Generate();
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if (!tPermissionID) return 0u;
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m_mapPermissions.emplace(tPermissionID, CreatePermissionObject(ePermission));
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return tPermissionID;
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}
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sdv::core::EAccessPermission CPermissionControl::GetCurrentPermission() const
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{
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return m_lstPermissionTracker.empty() ? sdv::core::EAccessPermission::restricted_access : m_lstPermissionTracker.front().first;
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}
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CAccessPermission CPermissionControl::CreatePermissionObject(sdv::core::EAccessPermission ePermission)
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{
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sdv::core::EAccessPermission ePermissionLocal = std::max(ePermission, sdv::core::EAccessPermission::restricted_access);
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return CAccessPermission(*this, ePermissionLocal);
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}
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void CPermissionControl::IncrementPermissionCount(sdv::core::EAccessPermission ePermission)
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{
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// In the permission tracker list, search for the counter for this permission or, if not existing, the next higher permission.
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auto itPermissionCounter = m_lstPermissionTracker.begin();
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for (; itPermissionCounter != m_lstPermissionTracker.end(); ++itPermissionCounter)
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{
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if (itPermissionCounter->first >= ePermission)
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break;
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}
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// If counter doesn't exist, insert a new counter.
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if (itPermissionCounter == m_lstPermissionTracker.end() || itPermissionCounter->first > ePermission)
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itPermissionCounter = m_lstPermissionTracker.insert(itPermissionCounter, std::make_pair(ePermission, 1));
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else // exists, increase the counter
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itPermissionCounter->second++;
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}
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void CPermissionControl::DecrementPermissionCount(sdv::core::EAccessPermission ePermission)
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{
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// Find the permission counter
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auto itPermissionCounter = std::find_if(m_lstPermissionTracker.begin(), m_lstPermissionTracker.end(), [&](const auto& rprPermissionCount)
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{ return rprPermissionCount.first == ePermission; });
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if (itPermissionCounter == m_lstPermissionTracker.end()) return;
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// Reduce the counter and if reaching zero, erase the counter
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itPermissionCounter->second--;
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if (!itPermissionCounter->second)
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m_lstPermissionTracker.erase(itPermissionCounter);
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}
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