shardmap 0.3.0

Sharded embedded in-memory map with optional cache, protocol, and server internals
Documentation 
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use bytes::BytesMut;

use crate::commands::redis::{define_redis_command, write_frame, wrong_arity};
use crate::protocol::Frame;
use crate::storage::EmbeddedStore;

define_redis_command!(BLMove, "BLMOVE", true);

impl crate::commands::redis::RedisCommand for BLMove {
    fn execute(store: &EmbeddedStore, args: &[&[u8]]) -> Frame {
        match args {
            [source, dest, source_side, dest_side, timeout] => {
                execute_blmove(store, source, dest, source_side, dest_side, timeout)
            }
            _ => wrong_arity("BLMOVE"),
        }
    }

    #[cfg(feature = "server")]
    fn write_resp(store: &EmbeddedStore, args: &[&[u8]], out: &mut BytesMut) {
        match args {
            [source, dest, source_side, dest_side, timeout] => write_frame(
                out,
                &execute_blmove(store, source, dest, source_side, dest_side, timeout),
            ),
            _ => write_frame(out, &wrong_arity("BLMOVE")),
        }
    }
}

fn execute_blmove(
    store: &EmbeddedStore,
    source: &[u8],
    dest: &[u8],
    source_side: &[u8],
    dest_side: &[u8],
    timeout: &[u8],
) -> Frame {
    let timeout = match crate::commands::blocking::parse_blocking_timeout(timeout) {
        Ok(timeout) => timeout,
        Err(frame) => return frame,
    };
    let keys = [source];
    let shard_id = match crate::commands::blocking::single_shard_for_keys(store, &keys) {
        Ok(shard_id) => shard_id,
        Err(frame) => return frame,
    };
    crate::commands::blocking::block_on_shard(store, shard_id, timeout, || {
        crate::commands::lmove::execute_lmove(store, source, dest, source_side, dest_side)
    })
}