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FerricFlow durable workflows and queues with native-protocol storage, Raft durability, and Bitcask persistence.

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ferricstore native ferricstore_bitcask src flow_physical_key.rs
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native/ferricstore_bitcask/src/flow_physical_key.rs 

use sha2::{Digest, Sha256};

use std::borrow::Cow;



const MAX_DIRECT_STATE_KEY_BYTES: usize = 511;

const PHYSICAL_STATE_KEY_PREFIX: &[u8] = b"\0flsk:1:";



pub(crate) fn physical_state_key(logical_state_key: &[u8]) -> Cow<'_, [u8]> {

    if logical_state_key.len() <= MAX_DIRECT_STATE_KEY_BYTES {

        Cow::Borrowed(logical_state_key)

    } else {

        let digest = Sha256::digest(logical_state_key);

        let mut physical_key = Vec::with_capacity(PHYSICAL_STATE_KEY_PREFIX.len() + digest.len());

        physical_key.extend_from_slice(PHYSICAL_STATE_KEY_PREFIX);

        physical_key.extend_from_slice(&digest);

        Cow::Owned(physical_key)

    }

}