techpack/sl_controller/server.lua

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--[[
sl_controller
=============
Copyright (C) 2017-2020 Joachim Stolberg
AGPL v3
See LICENSE.txt for more information
server.lua:
]]--
local SERVER_CAPA = 5000
local DEFAULT_MEM = {
size=0,
data={
version = 1,
info = "SaferLua key/value Server",
}
}
local function formspec(meta)
local names = meta:get_string("names") or ""
return "size[9,4]"..
default.gui_bg..
default.gui_bg_img..
default.gui_slots..
"field[0.2,1;9,1;names;Allowed user names (spaces separated):;"..names.."]" ..
"button_exit[3.5,2.5;2,1;exit;Save]"
end
local function on_time(pos, elasped)
if tubelib.data_not_corrupted(pos) then
local meta = minetest.get_meta(pos)
local number = meta:get_string("number")
local mem = tubelib.get_data(number, "memory") or table.copy(DEFAULT_MEM)
meta:set_string("infotext", "Server "..number..": ("..(mem.size or 0).."/"..SERVER_CAPA..")")
return true
end
return false
end
minetest.register_node("sl_controller:server", {
description = "Central Server",
tiles = {
-- up, down, right, left, back, front
"sl_controller_server_top.png",
"sl_controller_server_top.png",
"sl_controller_server_side.png",
"sl_controller_server_side.png^[transformFX",
"sl_controller_server_back.png",
{
image = "sl_controller_server_front.png",
backface_culling = false,
animation = {
type = "vertical_frames",
aspect_w = 32,
aspect_h = 32,
length = 1,
},
},
},
drawtype = "nodebox",
node_box = {
type = "fixed",
fixed = {
{ -3/16, -8/16, -7/16, 3/16, 6/16, 7/16},
},
},
after_place_node = function(pos, placer)
local meta = minetest.get_meta(pos)
local number = tubelib.add_node(pos, "sl_controller:server")
meta:set_string("owner", placer:get_player_name())
meta:set_string("number", number)
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tubelib.set_data(number, "memory", table.copy(DEFAULT_MEM))
meta:set_string("formspec", formspec(meta))
on_time(pos, 0)
minetest.get_node_timer(pos):start(20)
end,
on_receive_fields = function(pos, formname, fields, player)
local meta = minetest.get_meta(pos)
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local owner = meta:get_string("owner")
if player:get_player_name() == owner then
if fields.names and fields.names ~= "" then
local names = string.gsub(fields.names, " +", " ")
meta:set_string("names", names)
meta:set_string("formspec", formspec(meta))
end
end
end,
on_dig = function(pos, node, puncher, pointed_thing)
if minetest.is_protected(pos, puncher:get_player_name()) then
return
end
local meta = minetest.get_meta(pos)
local number = meta:get_string("number")
tubelib.set_data(number, "memory", nil)
minetest.node_dig(pos, node, puncher, pointed_thing)
tubelib.remove_node(pos)
end,
on_timer = on_time,
paramtype = "light",
sunlight_propagates = true,
paramtype2 = "facedir",
groups = {choppy=1, cracky=1, crumbly=1},
is_ground_content = false,
sounds = default.node_sound_stone_defaults(),
})
minetest.register_craft({
output = "sl_controller:server",
recipe = {
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{"", "dye:black", ""},
{"default:mese_crystal", "tubelib:wlanchip", "default:mese_crystal"},
{"default:steel_ingot", "default:copper_ingot", "default:steel_ingot"},
},
})
local function calc_size(v)
if type(v) == "number" then
return 1
elseif v == nil then
return 0
elseif type(v) == "string" then
return #v
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elseif v.MemSize then
return v.MemSize
else
return nil
end
end
local function get_memory(num, name)
local info = tubelib.get_node_info(num)
if info and info.name == "sl_controller:server" then
local meta = minetest.get_meta(info.pos)
local owner = meta:get_string("owner")
if name == owner then
return tubelib.get_data(num, "memory") or table.copy(DEFAULT_MEM)
end
local names = meta:get_string("names")
for _,n in ipairs(string.split(names, " ")) do
if name == n then
return tubelib.get_data(num, "memory") or table.copy(DEFAULT_MEM)
end
end
end
end
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local function write_value(mem, key, item)
if mem and mem.size < SERVER_CAPA then
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if mem.data[key] then
mem.size = mem.size - calc_size(mem.data[key])
end
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if type(item) == "table" then
item = safer_lua.datastruct_to_table(item)
end
mem.size = mem.size + calc_size(item)
mem.data[key] = item
end
end
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local function read_value(mem, key)
local item = mem.data[key]
if type(item) == "table" then
item = safer_lua.table_to_datastruct(item)
end
return item
end
tubelib.register_node("sl_controller:server", {}, {
on_recv_message = function(pos, topic, payload)
return "unsupported"
end,
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on_node_load = function(pos)
minetest.get_node_timer(pos):start(20)
end,
})
sl_controller.register_function("server_read", {
cmnd = function(self, num, key)
if type(key) == "string" then
local mem = get_memory(num, self.meta.owner)
if mem then
return read_value(mem, key)
end
else
self.error("Invalid server_read parameter")
end
end,
help = " $server_read(num, key)\n"..
" Read a value from the server.\n"..
" 'key' must be a string.\n"..
' example: state = $server_read("0123", "state")'
})
sl_controller.register_action("server_write", {
cmnd = function(self, num, key, value)
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if type(key) == "string" then
local mem = get_memory(num, self.meta.owner)
if mem then
write_value(mem, key, value)
end
else
self.error("Invalid server_write parameter")
end
end,
help = " $server_write(num, key, value)\n"..
" Store a value on the server under the key 'key'.\n"..
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" 'key' must be a string. 'value' can be either a\n"..
" number, string, boolean, nil or data structure.\n"..
' example: $server_write("0123", "state", state)'
})