tubelib2/storage.lua

147 lines
3.7 KiB
Lua

--[[
Tube Library 2
==============
Copyright (C) 2017-2020 Joachim Stolberg
LGPLv2.1+
See LICENSE.txt for more information
storage.lua
]]--
--
-- Data maintenance
--
local MemStore = {}
local storage = minetest.get_mod_storage()
local function update_mod_storage()
local gametime = minetest.get_gametime()
for k,v in pairs(MemStore) do
if v.used then
v.used = false
v.best_before = gametime + (60 * 30) -- 30 min
storage:set_string(k, minetest.serialize(v))
elseif v.best_before < gametime then
storage:set_string(k, minetest.serialize(v))
MemStore[k] = nil -- remove from memory
end
end
-- run every 10 minutes
minetest.after(600, update_mod_storage)
end
minetest.register_on_shutdown(function()
for k,v in pairs(MemStore) do
storage:set_string(k, minetest.serialize(v))
end
end)
minetest.after(600, update_mod_storage)
local function empty_block(block)
local empty = true
local tbl = minetest.deserialize(block)
for k,v in pairs(tbl) do
if k ~= "used" and k ~= "best_before" then
empty = false
end
end
return empty
end
minetest.after(1, function()
local tbl = storage:to_table()
for k,v in pairs(tbl.fields) do
if empty_block(v) then
storage:set_string(k, "")
end
end
end)
--
-- Local helper functions
--
local function new_block(block_key)
local data = storage:get_string(block_key)
if data == nil or data == "" then -- TODO: change for v5
MemStore[block_key] = {}
else
MemStore[block_key] = minetest.deserialize(data)
end
return MemStore[block_key]
end
local function new_node(block, node_key)
block[node_key] = {}
return block[node_key]
end
local function unlock(pos)
local block_key = math.floor((pos.z+32768)/16)*4096*4096 +
math.floor((pos.y+32768)/16)*4096 + math.floor((pos.x+32768)/16)
local node_key = (pos.z%16)*16*16 + (pos.y%16)*16 + (pos.x%16)
local block = MemStore[block_key] or new_block(block_key)
block.used = true
return block, node_key
end
local function keys_to_pos(block_key, node_key)
local f = math.floor
block_key = tonumber(block_key) or 0
node_key = tonumber(node_key) or 0
local x = ((f(block_key % 0x1000) * 0x10) - 32768) + (node_key % 0x10)
block_key, node_key = f(block_key / 0x1000), f(node_key / 0x10)
local y = ((f(block_key % 0x1000) * 0x10) - 32768) + (node_key % 0x10)
block_key, node_key = f(block_key / 0x1000), f(node_key / 0x10)
local z = ((f(block_key % 0x1000) * 0x10) - 32768) + (node_key % 0x10)
return {x = x, y = y, z = z}
end
-------------------------------------------------------------------------------
-- API functions for a node related and high efficient storage table
-- for all kind of node data.
-------------------------------------------------------------------------------
-- To be called when a node is placed
function tubelib2.init_mem(pos)
local block, node_key = unlock(pos)
return new_node(block, node_key)
end
-- To get the node data table
function tubelib2.get_mem(pos)
local block, node_key = unlock(pos)
return block[node_key] or new_node(block, node_key)
end
-- To be called when a node is removed
function tubelib2.del_mem(pos)
local block, node_key = unlock(pos)
block[node_key] = nil
end
-- Read a value, or return the default value if not available
function tubelib2.get_mem_data(pos, key, default)
return tubelib2.get_mem(pos)[key] or default
end
function tubelib2.walk_over_all(clbk)
local data = storage:to_table()
for block_key,sblock in pairs(data.fields) do
local block = minetest.deserialize(sblock)
for node_key,mem in pairs(block) do
if mem then
if node_key ~= "used" and node_key ~= "best_before" then
local pos = keys_to_pos(block_key, node_key)
local node = tubelib2.get_node_lvm(pos)
clbk(pos, node, mem)
end
end
end
end
end