127 lines
3.3 KiB
Lua
127 lines
3.3 KiB
Lua
--[[
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sqlite backend for insidethebox
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This backend stores various persistent world data bits that are
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not properly stored by the minetest engine. This mod provides both
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persistent and performant data storage for the itb game until a
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better solution exists.
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Major data storage parts in this db:
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- players, player scores
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No player metadata storage exists currently. Only HP and air
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are stored in player data. We lack storage for things like
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skin choice, stamina, RPG points and skills, etc.
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- box data
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--]]
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local world_path = minetest.get_worldpath()
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-- local sqlite3 = require("lsqlite3")
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local insecure_env = minetest.request_insecure_environment()
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local sqlite3 = insecure_env.require("lsqlite3")
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local itb_db = sqlite3.open(world_path .. "/itb.sqlite")
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if not itb_db then
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assert("lsqlite3 not available or non-functional. Please use e.g. luarocks to install lsqlite3")
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end
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-- we require these tables to exist:
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assert(itb_db:exec[[
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CREATE TABLE box (id INTEGER PRIMARY KEY, data BLOB);
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CREATE TABLE series (id INTEGER PRIMARY KEY, name TEXT, meta BLOB);
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CREATE TABLE series_box (series_id INTEGER, box_id INTEGER);
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CREATE TABLE player (id INTEGER PRIMARY KEY, name TEXT, meta BLOB);
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CREATE TABLE points (player_id INTEGER, score REAL, type TEXT, box_id INTEGER);
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]])
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-- table structure and content
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--[[
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box table: Contain the storage of the box content (not metadata) so all blocks. (one-to-one)
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- id: box identifier
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- data: box contents (nodes)
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series: Contains existing series
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- id: series ID
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- name: name of the series
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- meta: misc data
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series_box: maps boxes into series (many-to-many)
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- series_id: series ID
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- box_id: box ID
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player: player info
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- id: player number
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- name: player name
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- meta: random player data bits
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score: player and box score data
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- player_id: player id
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- score: score value
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- type: score type (e.g. reviewed a box)
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- box: associated box ID
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--]]
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db = {}
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function db.player_get_meta(name)
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-- FIXME use http://luasqlite.luaforge.net/lsqlite3.html#db:prepare to prevent SQL injection
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for row in itb_db:nrows("SELECT meta FROM player WHERE name = '" .. name .. "';") do
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return minetest.parse_json(row.meta)
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end
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print("no such player in db", name)
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return nil
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end
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function db.player_put_meta(name, meta)
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-- FIXME use http://luasqlite.luaforge.net/lsqlite3.html#db:prepare to prevent SQL injection
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local r = itb_db:exec("REPLACE INTO player_meta (name, meta) VALUES ('" .. name .. "', '" ..
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minetest.write_json(meta) .. "');")
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if not r then
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print("error writing")
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return false
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else
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return true
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end
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end
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function db.box_get_data(box_id)
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local stmt = itb_db:prepare[[
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SELECT data FROM box WHERE id = :box_id
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]]
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stmt:bind_names{box_id = box_id}
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for row in stmt:nrows() do
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stmt:finalize()
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return row.data
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end
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stmt:finalize()
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print("no such box in db", box_id)
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return nil
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end
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function db.box_set_data(box_id, data)
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local stmt = itb_db:prepare[[
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INSERT INTO box (id, data) VALUES(:box_id, :box_data)
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]]
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stmt:bind_names{box_id = box_id, box_data = data}
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local r = stmt:step()
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stmt:finalize()
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if not r then
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print("error writing")
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return false
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else
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return true
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end
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end
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minetest.register_on_shutdown(function()
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itb_db:close()
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end)
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