Struct tickv::AsyncTicKV

pub struct AsyncTicKV<'a, C: FlashController<S>, const S: usize> {
    pub tickv: TicKV<'a, C, S>,
    /* private fields */
}

The struct storing all of the TicKV information for the async implementation.

Fields

tickv: TicKV<'a, C, S>

The main TicKV struct

Implementations

impl<'a, C: FlashController<S>, const S: usize> AsyncTicKV<'a, C, S>

pub fn new( controller: C, read_buffer: &'a mut [u8; S], flash_size: usize ) -> Self

Create a new struct

C: An implementation of the FlashController trait

controller: An new struct implementing FlashController flash_size: The total size of the flash used for TicKV

pub fn initialise(&self, hashed_main_key: u64) -> Result<SuccessCode, ErrorCode>

This function setups the flash region to be used as a key-value store. If the region is already initialised this won’t make any changes.

hashed_main_key: The u64 hash of the const string MAIN_KEY.

If the specified region has not already been setup for TicKV the entire region will be erased.

On success a SuccessCode will be returned. On error a ErrorCode will be returned.

pub fn append_key( &self, hash: u64, value: &'static mut [u8], length: usize ) -> Result<SuccessCode, (&'static mut [u8], ErrorCode)>

Appends the key/value pair to flash storage.

hash: A hashed key. This key will be used in future to retrieve or remove the value. value: A buffer containing the data to be stored to flash.

On success nothing will be returned. On error a ErrorCode will be returned.

pub fn get_key( &self, hash: u64, buf: &'static mut [u8] ) -> Result<SuccessCode, (&'static mut [u8], ErrorCode)>

Retrieves the value from flash storage.

hash: A hashed key. buf: A buffer to store the value to.

On success a SuccessCode will be returned. On error a ErrorCode will be returned.

If a power loss occurs before success is returned the data is assumed to be lost.

pub fn invalidate_key(&self, hash: u64) -> Result<SuccessCode, ErrorCode>

Invalidates the key in flash storage

hash: A hashed key. key: A unhashed key. This will be hashed internally.

On success a SuccessCode will be returned. On error a ErrorCode will be returned.

If a power loss occurs before success is returned the data is assumed to be lost.

pub fn zeroise_key(&self, hash: u64) -> Result<SuccessCode, ErrorCode>

Zeroizes the key in flash storage

hash: A hashed key. key: A unhashed key. This will be hashed internally.

On success a SuccessCode will be returned. On error a ErrorCode will be returned.

If a power loss occurs before success is returned the data is assumed to be lost.

pub fn garbage_collect(&self) -> Result<SuccessCode, ErrorCode>

Perform a garbage collection on TicKV

On success a SuccessCode will be returned. On error a ErrorCode will be returned.

pub fn set_read_buffer(&self, read_buffer: &[u8])

Copy data from read_buffer argument to the internal read_buffer. This should be used to copy the data that the implementation wanted to read when calling read_region after the async operation has completed.

pub fn continue_operation( &self ) -> (Result<SuccessCode, ErrorCode>, Option<&'static mut [u8]>, usize)

Continue the last operation after the async operation has completed. This should be called from a read/erase complete callback. NOTE: If called from a read callback, set_read_buffer should be called first to update the data.

hash_function: Hash function with no previous state. This is usually a newly created hash.

Returns a tuple of 3 values Result: On success a SuccessCode will be returned. On error a ErrorCode will be returned. Buf Buffer: An option of the buf buffer used Length usize: The number of valid bytes in the buffer. 0 if Buf is None. The buffers will only be returned on a non async error or on success.