VoxeLibre/mods/ENTITIES/mcl_minecarts/storage.lua

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local storage = minetest.get_mod_storage()
local mod = mcl_minecarts
-- Imports
local CART_BLOCK_SIZE = mod.CART_BLOCK_SIZE
local cart_data = {}
local cart_data_fail_cache = {}
local cart_ids = storage:get_keys()
local function get_cart_data(uuid)
if cart_data[uuid] then return cart_data[uuid] end
if cart_data_fail_cache[uuid] then return nil end
local data = minetest.deserialize(storage:get_string("cart-"..uuid))
if not data then
cart_data_fail_cache[uuid] = true
return nil
else
-- Repair broken data
if not data.distance then data.distance = 0 end
if data.distance == 0/0 then data.distance = 0 end
if data.distance == -0/0 then data.distance = 0 end
data.dir = vector.new(data.dir)
data.connected_at = vector.new(data.connected_at)
end
cart_data[uuid] = data
return data
end
mod.get_cart_data = get_cart_data
-- Preload all cart data into memory
for _,id in pairs(cart_ids) do
local uuid = string.sub(id,6)
get_cart_data(uuid)
end
local function save_cart_data(uuid)
if not cart_data[uuid] then return end
storage:set_string("cart-"..uuid,minetest.serialize(cart_data[uuid]))
end
mod.save_cart_data = save_cart_data
function mod.update_cart_data(data)
local uuid = data.uuid
cart_data[uuid] = data
cart_data_fail_cache[uuid] = nil
save_cart_data(uuid)
end
function mod.destroy_cart_data(uuid)
storage:set_string("cart-"..uuid,"")
cart_data[uuid] = nil
cart_data_fail_cache[uuid] = true
end
function mod.carts()
return pairs(cart_data)
end
function mod.find_carts_by_block_map(block_map)
local cart_list = {}
for _,data in pairs(cart_data) do
if data and data.connected_at then
local pos = mod.get_cart_position(data)
local block = vector.floor(vector.divide(pos,CART_BLOCK_SIZE))
if block_map[vector.to_string(block)] then
cart_list[#cart_list + 1] = data
end
end
end
return cart_list
end
minetest.register_on_shutdown(function()
for uuid,_ in pairs(cart_data) do
save_cart_data(uuid)
end
end)