108 lines
2.5 KiB
Lua
108 lines
2.5 KiB
Lua
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--[[
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TechAge
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=======
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Copyright (C) 2020 Joachim Stolberg
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GPL v3
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See LICENSE.txt for more information
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Node number management/storage based on SQLite
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]]--
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local MN = minetest.get_current_modname()
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local WP = minetest.get_worldpath()
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local IE = minetest.request_insecure_environment()
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if not IE then
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error("Please add 'secure.trusted_mods = techage' to minetest.conf!")
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end
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local sqlite3 = IE.require("lsqlite3")
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local marshal = IE.require("marshal")
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if not sqlite3 then
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error("Please install sqlite3 via 'luarocks install lsqlite3'")
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end
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if not marshal then
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error("Please install marshal via 'luarocks install lua-marshal'")
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end
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local db = sqlite3.open(WP.."/techage_numbers.sqlite3")
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-- Prevent use of this db instance.
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if sqlite3 then sqlite3 = nil end
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db:exec[[
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CREATE TABLE test2(id INTEGER PRIMARY KEY, number INTEGER, x INTEGER, y INTEGER, z INTEGER);
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CREATE INDEX idx ON test2(number);
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]]
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local insert = db:prepare("INSERT INTO test2 VALUES(NULL, ?, ?, ?, ?);")
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local query = db:prepare("SELECT * FROM test2 WHERE number=?")
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local backend = {}
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local storage = minetest.get_mod_storage()
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local function set(number, pos)
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insert:reset()
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insert:bind(1, number)
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insert:bind(2, pos.x)
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insert:bind(3, pos.y)
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insert:bind(4, pos.z)
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insert:step()
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end
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local function get(number)
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query:reset()
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query:bind(1, number)
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query:step()
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local _, _, x, y, z, name = unpack(query:get_values())
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return {pos = {x = x, y = y, z = z}, name = name}
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end
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-------------------------------------------------------------------
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-- API functions
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-------------------------------------------------------------------
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function backend.get_nodepos(number)
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return minetest.string_to_pos(storage:get_string(number))
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end
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function backend.set_nodepos(number, pos)
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storage:get_string(number, minetest.pos_to_string(pos))
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end
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function backend.add_nodepos(pos)
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local num = tostring(NextNumber)
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NextNumber = NextNumber + 1
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storage:set_int("NextNumber", NextNumber)
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storage:get_string(num, minetest.pos_to_string(pos))
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return num
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end
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function backend.del_nodepos(number)
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storage:get_string(number, "")
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end
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-- delete invalid entries
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function backend.delete_invalid_entries(node_def)
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minetest.log("info", "[TechAge] Data maintenance started")
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for i = 1, NextNumber do
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local number = tostring(i)
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if storage:contains(number) then
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local pos = backend.get_nodepos(number)
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local name = techage.get_node_lvm(pos).name
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if not node_def[name] then
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backend.del_nodepos(number)
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end
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end
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end
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minetest.log("info", "[TechAge] Data maintenance finished")
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end
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return backend
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