217 lines
7.9 KiB
C++
217 lines
7.9 KiB
C++
#ifndef BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_
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#define BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_
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#include <fsfw/osal/linux/CommandExecutor.h>
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#include "definitions.h"
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#include "returnvalues/classIds.h"
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#include "events/subsystemIdRanges.h"
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#include "fsfw/events/Event.h"
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#include "fsfw/returnvalues/HasReturnvaluesIF.h"
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#include <poll.h>
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#include <cstdint>
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#include <utility>
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#include <string>
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#include <optional>
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#include <array>
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class MutexIF;
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/**
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* @brief Manages handling of SD cards like switching them on or off or getting the current
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* state
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*/
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class SdCardManager {
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friend class SdCardAccess;
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public:
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enum class Operations {
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SWITCHING_ON,
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SWITCHING_OFF,
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MOUNTING,
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UNMOUNTING,
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IDLE
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};
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enum class OpStatus {
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IDLE,
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TIMEOUT,
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ONGOING,
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SUCCESS,
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FAIL
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};
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using SdStatePair = std::pair<sd::SdState, sd::SdState>;
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static constexpr uint8_t INTERFACE_ID = CLASS_ID::SD_CARD_MANAGER;
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static constexpr ReturnValue_t OP_ONGOING =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 0);
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static constexpr ReturnValue_t ALREADY_ON =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 1);
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static constexpr ReturnValue_t ALREADY_MOUNTED =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 2);
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static constexpr ReturnValue_t ALREADY_OFF =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 3);
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static constexpr ReturnValue_t STATUS_FILE_NEXISTS =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 10);
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static constexpr ReturnValue_t STATUS_FILE_FORMAT_INVALID =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 11);
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static constexpr ReturnValue_t MOUNT_ERROR =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 12);
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static constexpr ReturnValue_t UNMOUNT_ERROR =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 13);
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static constexpr ReturnValue_t SYSTEM_CALL_ERROR =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 14);
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static constexpr ReturnValue_t POPEN_CALL_ERROR =
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HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 15);
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static constexpr uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::FILE_SYSTEM;
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static constexpr Event SANITIZATION_FAILED = event::makeEvent(SUBSYSTEM_ID, 0, severity::LOW);
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// C++17 does not support constexpr std::string yet
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static constexpr char SD_0_DEV_NAME[] = "/dev/mmcblk0p1";
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static constexpr char SD_1_DEV_NAME[] = "/dev/mmcblk1p1";
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static constexpr char SD_0_MOUNT_POINT[] = "/mnt/sd0";
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static constexpr char SD_1_MOUNT_POINT[] = "/mnt/sd1";
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static constexpr char SD_STATE_FILE[] = "/tmp/sd_status.txt";
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virtual ~SdCardManager();
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static void create();
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/**
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* Returns the single instance of the SD card manager.
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*/
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static SdCardManager* instance();
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/**
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* Set the preferred SD card which will determine which SD card will be used as the primary
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* SD card in hot redundant and cold redundant mode. This function will not switch the
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* SD cards which are currently on and mounted, this needs to be implemented by
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* an upper layer by using #switchOffSdCard , #switchOnSdCard and #updateSdCardStateFile
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* @param sdCard
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* @return
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*/
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ReturnValue_t setPreferredSdCard(sd::SdCard sdCard);
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/**
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* Get the currently configured preferred SD card
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* @param sdCard
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* @return
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*/
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ReturnValue_t getPreferredSdCard(sd::SdCard& sdCard) const;
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/**
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* Switch on the specified SD card.
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* @param sdCard
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* @param doMountSdCard Mount the SD card after switching it on, which is necessary
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* to use it
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* @param statusPair If the status pair is already available, it can be passed here
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* @return - RETURN_OK on success, ALREADY_ON if it is already on,
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* SYSTEM_CALL_ERROR on system error
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*/
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ReturnValue_t switchOnSdCard(sd::SdCard sdCard, bool doMountSdCard = true,
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SdStatePair* statusPair = nullptr);
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/**
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* Switch off the specified SD card.
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* @param sdCard
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* @param doUnmountSdCard Unmount the SD card before switching the card off, which makes
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* the operation safer
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* @param statusPair If the status pair is already available, it can be passed here
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* @return - RETURN_OK on success, ALREADY_ON if it is already on,
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* SYSTEM_CALL_ERROR on system error
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*/
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ReturnValue_t switchOffSdCard(sd::SdCard sdCard, bool doUnmountSdCard = true,
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SdStatePair* statusPair = nullptr);
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/**
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* Update the state file or creates one if it does not exist. You need to call this
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* function before calling #sdCardActive
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* @return
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* - RETURN_OK if the state file was updated successfully
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* - CommandExecutor::COMMAND_PENDING: Non-blocking command is pending
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* - RETURN_FAILED: blocking command failed
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*/
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ReturnValue_t updateSdCardStateFile();
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/**
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* Get the state of the SD cards. If the state file does not exist, this function will
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* take care of updating it. If it does not, the function will use the state file to get
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* the status of the SD cards and set the field of the provided boolean pair.
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* @param active Pair of booleans, where the first entry is the state of the first SD card
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* and the second one the state of the second SD card
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* @return - RETURN_OK if the state was read successfully
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* - STATUS_FILE_FORMAT_INVALID if there was an issue with the state file. The user
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* should call #updateSdCardStateFile again in that case
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* - STATUS_FILE_NEXISTS if the status file does not exist
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*/
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ReturnValue_t getSdCardActiveStatus(SdStatePair& active);
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/**
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* Mount the specified SD card. This is necessary to use it.
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* @param sdCard
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* @return
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*/
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ReturnValue_t mountSdCard(sd::SdCard sdCard);
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/**
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* Unmount the specified SD card. This is recommended before switching it off. The SD card
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* can't be used after it has been unmounted.
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* @param sdCard
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* @return
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*/
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ReturnValue_t unmountSdCard(sd::SdCard sdCard);
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/**
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* In case that there is a discrepancy between the preferred SD card and the currently
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* mounted one, this function will sanitize the state by attempting to mount the
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* currently preferred SD card. If the caller already has state information, it can be
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* passed into the function. For now, this operation will be enforced in blocking mode.
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* @param statusPair Current SD card status capture with #getSdCardActiveStatus
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* @param prefSdCard Preferred SD card captured with #getPreferredSdCard
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* @throws std::bad_alloc if one of the two arguments was a nullptr and an allocation failed
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* @return
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*/
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ReturnValue_t sanitizeState(SdStatePair* statusPair = nullptr,
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sd::SdCard prefSdCard = sd::SdCard::NONE);
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/**
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* If sd::SdCard::NONE is passed as an argument, this funtion will get the currently
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* preferred SD card from the scratch buffer.
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* @param prefSdCardPtr
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* @return
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*/
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std::string getCurrentMountPrefix(sd::SdCard prefSdCardPtr = sd::SdCard::NONE);
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OpStatus checkCurrentOp(Operations& currentOp);
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/**
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* If there are issues with the state machine, it can be reset with this function
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*/
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void resetState();
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void setBlocking(bool blocking);
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void setPrintCommandOutput(bool print);
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private:
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CommandExecutor cmdExecutor;
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Operations currentOp = Operations::IDLE;
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bool blocking = false;
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bool printCmdOutput = true;
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SdCardManager();
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ReturnValue_t setSdCardState(sd::SdCard sdCard, bool on);
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void processSdStatusLine(SdStatePair& active, std::string& line, uint8_t& idx,
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sd::SdCard& currentSd);
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std::string currentPrefix;
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static SdCardManager* factoryInstance;
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};
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#endif /* BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_ */
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