fsfw/src/fsfw/devicehandlers/AssemblyBase.h
Robin Mueller 371ff931bf
Linux CommandExecutor
The CommandExecutor helper class can execute shell commands in blocking and non-blocking mode
This class is able to execute processes by using the Linux popen call. It also has the capability of writing
the read output of a process into a provided ring buffer.

The executor works by first loading the command which should be executed and specifying whether
it should be executed blocking or non-blocking. After that, execution can be started with the execute call.

Using non-blocking mode allows to execute commands which might take a longer time in the background,
and allowing the user thread to check completion status with the check function

Moved to HAL like requested in code review and unit tested with failing commands as well.
Also, Linux HAL components are compiled by default now unless explicitely disabled.
2022-01-26 12:11:52 +01:00

181 lines
5.8 KiB
C++

#ifndef FSFW_DEVICEHANDLERS_ASSEMBLYBASE_H_
#define FSFW_DEVICEHANDLERS_ASSEMBLYBASE_H_
#include "DeviceHandlerBase.h"
#include "../container/FixedArrayList.h"
#include "../subsystem/SubsystemBase.h"
/**
* @brief Base class to implement reconfiguration and failure handling for
* redundant devices by monitoring their modes and health states.
* @details
* Documentation: Dissertation Baetz p.156, 157.
*
* This class reduces the complexity of controller components which would
* otherwise be needed for the handling of redundant devices.
*
* The template class monitors mode and health state of its children
* and checks availability of devices on every detected change.
* AssemblyBase does not implement any redundancy logic by itself, but provides
* adaptation points for implementations to do so. Since most monitoring
* activities rely on mode and health state only and are therefore
* generic, it is sufficient for subclasses to provide:
*
* 1. check logic when active-> checkChildrenStateOn
* 2. transition logic to change the mode -> commandChildren
*
* Important:
*
* The implementation must call registerChild(object_id_t child)
* for all commanded children during initialization.
* The implementation must call the initialization function of the base class.
* (This will call the function in SubsystemBase)
*
*/
class AssemblyBase: public SubsystemBase {
public:
static const uint8_t INTERFACE_ID = CLASS_ID::ASSEMBLY_BASE;
static const ReturnValue_t NEED_SECOND_STEP = MAKE_RETURN_CODE(0x01);
static const ReturnValue_t NEED_TO_RECONFIGURE = MAKE_RETURN_CODE(0x02);
static const ReturnValue_t MODE_FALLBACK = MAKE_RETURN_CODE(0x03);
static const ReturnValue_t CHILD_NOT_COMMANDABLE = MAKE_RETURN_CODE(0x04);
static const ReturnValue_t NEED_TO_CHANGE_HEALTH = MAKE_RETURN_CODE(0x05);
static const ReturnValue_t NOT_ENOUGH_CHILDREN_IN_CORRECT_STATE =
MAKE_RETURN_CODE(0xa1);
AssemblyBase(object_id_t objectId, object_id_t parentId,
uint16_t commandQueueDepth = 8);
virtual ~AssemblyBase();
protected:
/**
* Command children to reach [mode,submode] combination
* Can be done by setting #commandsOutstanding correctly,
* or using executeTable()
* @param mode
* @param submode
* @return
* - @c RETURN_OK if ok
* - @c NEED_SECOND_STEP if children need to be commanded again
*/
virtual ReturnValue_t commandChildren(Mode_t mode, Submode_t submode) = 0;
/**
* Check whether desired assembly mode was achieved by checking the modes
* or/and health states of child device handlers.
* The assembly template class will also call this function if a health
* or mode change of a child device handler was detected.
* @param wantedMode
* @param wantedSubmode
* @return
*/
virtual ReturnValue_t checkChildrenStateOn(Mode_t wantedMode,
Submode_t wantedSubmode) = 0;
/**
* Check whether a combination of mode and submode is valid.
*
* Ground Controller like precise return values from HasModesIF.
* So, please return any of them.
*
* @param mode The targeted mode
* @param submode The targeted submmode
* @return Any information why this combination is invalid from HasModesIF
* like HasModesIF::INVALID_SUBMODE.
* On success return HasReturnvaluesIF::RETURN_OK
*/
virtual ReturnValue_t isModeCombinationValid(Mode_t mode,
Submode_t submode) = 0;
enum InternalState {
STATE_NONE,
STATE_OVERWRITE_HEALTH,
STATE_NEED_SECOND_STEP,
STATE_SINGLE_STEP,
STATE_SECOND_STEP,
} internalState;
enum RecoveryState {
RECOVERY_IDLE,
RECOVERY_STARTED,
RECOVERY_ONGOING,
RECOVERY_ONGOING_2,
RECOVERY_WAIT
} recoveryState; //!< Indicates if one of the children requested a recovery.
ChildrenMap::iterator recoveringDevice;
/**
* the mode the current transition is trying to achieve.
* Can be different from the modehelper.commandedMode!
*/
Mode_t targetMode;
/**
* the submode the current transition is trying to achieve.
* Can be different from the modehelper.commandedSubmode!
*/
Submode_t targetSubmode;
Countdown recoveryOffTimer;
static const uint32_t POWER_OFF_TIME_MS = 1000;
virtual ReturnValue_t handleCommandMessage(CommandMessage *message);
virtual ReturnValue_t handleHealthReply(CommandMessage *message);
virtual void performChildOperation();
bool handleChildrenChanged();
/**
* This method is called if the children changed its mode in a way that
* the current mode can't be kept.
* Default behavior is to go to MODE_OFF.
* @param result The failure code which was returned by checkChildrenState.
*/
virtual void handleChildrenLostMode(ReturnValue_t result);
bool handleChildrenChangedHealth();
virtual void handleChildrenTransition();
ReturnValue_t checkModeCommand(Mode_t mode, Submode_t submode,
uint32_t *msToReachTheMode);
virtual void startTransition(Mode_t mode, Submode_t submode);
virtual void doStartTransition(Mode_t mode, Submode_t submode);
virtual bool isInTransition();
virtual void handleModeReached();
virtual void handleModeTransitionFailed(ReturnValue_t result);
void sendHealthCommand(MessageQueueId_t sendTo, HealthState health);
virtual ReturnValue_t checkChildrenStateOff();
ReturnValue_t checkChildrenState();
virtual ReturnValue_t checkChildOff(uint32_t objectId);
/**
* Manages recovery of a device
* @return true if recovery is still ongoing, false else.
*/
bool checkAndHandleRecovery();
/**
* Helper method to overwrite health state of one of the children.
* Also sets state to STATE_OVERWRITE_HEATH.
* @param objectId Must be a registered child.
*/
void overwriteDeviceHealth(object_id_t objectId,
HasHealthIF::HealthState oldHealth);
};
#endif /* FSFW_DEVICEHANDLERS_ASSEMBLYBASE_H_ */