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