Battery and Server added

Further improvements

safer_lua/environ.lua

@@ -12,7 +12,7 @@
 
 ]]--
 
-safer_lua.MaxCodeSize = 1000    -- size in length of byte code
+safer_lua.MaxCodeSize = 2000    -- size in length of byte code
 safer_lua.MaxTableSize = 1000   -- number of table entries considering string lenghts
 
 

safer_lua/store.lua

@@ -35,6 +35,7 @@ safer_lua.StoreHelp = [[
    tbl.set(key, value)   --> add/set a value
    tbl.get(key)	           --> read a value
    tbl.size()                 --> return the table size
+   tbl.capa()                 --> return the max. capacity   
    tbl.insert(pos, value) --> insert into list   
    tbl.remove(pos)       --> return and remove from list
    tbl.sort()                   -- sort list
@@ -79,14 +80,27 @@ function safer_lua.Store(...)
 	end
 	
 	new_t.set = function(k,v)
-		if type(k) == "string" or type(k) == "number" then
+		if type(k) == "number" then
-			Count = Count - mt.count(rawget(new_t.__data__, k))
 			local cnt = mt.count(v)
-			if cnt then
+			cnt = cnt - mt.count(rawget(new_t.__data__, k))
-				Count = Count + cnt
+			if Count + cnt < safer_lua.MaxTableSize then
-				if Count < safer_lua.MaxTableSize then
 				rawset(new_t.__data__,k,v)
+				Count = Count + cnt
 			end
+		elseif type(k) == "string" then
+			local cnt = mt.count(rawget(new_t.__data__, k))
+			if cnt == 0 then           -- new entry?
+				cnt = mt.count(v)
+				cnt = cnt + mt.count(k)
+			elseif v == nil then       -- delete entry?
+				cnt = - cnt - mt.count(k)
+			else                       -- overwrite
+				cnt = mt.count(v) - cnt
+			end
+				
+			if Count + cnt < safer_lua.MaxTableSize then
+				rawset(new_t.__data__,k,v)
+				Count = Count + cnt
 			end
 		end
 	end
@@ -99,14 +113,16 @@ function safer_lua.Store(...)
 		return Count
 	end
  
+	new_t.capa = function(t)
+		return safer_lua.MaxTableSize
+	end
+ 
 	new_t.insert = function(v, i)
 		local cnt = mt.count(v)
-		if cnt then
-			Count = Count + cnt
 		if i == nil then i = #new_t.__data__ + 1 end
-			if Count < safer_lua.MaxTableSize then
+		if Count + cnt < safer_lua.MaxTableSize then
 			table.insert(new_t.__data__,i,v)
-			end
+			Count = Count + cnt
 		end
 	end
 	

sl_controller/battery.lua

@@ -12,10 +12,15 @@
 
 ]]--
 
+local function calc_percent(content)
+	local val = (sl_controller.battery_capacity - 
+			math.min(content or 0, sl_controller.battery_capacity))
+	return 100 - math.floor((val * 100.0 / sl_controller.battery_capacity))
+end
+
 local function on_timer(pos, elapsed)
 	local meta = minetest.get_meta(pos)
-	local percent = (sl_controller.battery_capacity - meta:get_int("content"))
+	local percent = calc_percent(meta:get_int("content"))
-	percent = 100 - math.floor((percent * 100.0 / sl_controller.battery_capacity))
 	meta:set_string("infotext", "Battery ("..percent.."%)")
 	if percent == 0 then
 		local node = minetest.get_node(pos)
@@ -26,7 +31,8 @@ local function on_timer(pos, elapsed)
 	return true
 end
 
-minetest.register_node("sl_controller:battery", {
+local function register_battery(ext, percent)
+	minetest.register_node("sl_controller:battery"..ext, {
 		description = "Battery",
 		inventory_image = 'sl_controller_battery_inventory.png',
 		wield_image = 'sl_controller_battery_inventory.png',
@@ -50,13 +56,37 @@ minetest.register_node("sl_controller:battery", {
 		
 		after_place_node = function(pos, placer)
 			local meta = minetest.get_meta(pos)
-		meta:set_int("content", sl_controller.battery_capacity)
+			meta:set_int("content", sl_controller.battery_capacity * percent)
+			local node = minetest.get_node(pos)
+			node.name = "sl_controller:battery"
+			minetest.swap_node(pos, node)
 			on_timer(pos, 1)
 			minetest.get_node_timer(pos):start(30)
 		end,
 		
 		on_timer = on_timer,
 		
+		
+		after_dig_node = function(pos, oldnode, oldmetadata, digger)
+			local percent = calc_percent(tonumber(oldmetadata.fields.content))
+			print("percent", percent)
+			local stack
+			if percent > 95 then
+				stack = ItemStack("sl_controller:battery")
+			elseif percent > 75 then
+				stack = ItemStack("sl_controller:battery75")
+			elseif percent > 50 then
+				stack = ItemStack("sl_controller:battery50")
+			elseif percent > 25 then
+				stack = ItemStack("sl_controller:battery25")
+			else
+				return
+			end
+			print("percent", percent)
+			local inv = minetest.get_inventory({type="player", name=digger:get_player_name()})
+			inv:add_item("main", stack)
+		end,
+
 		paramtype = "light",
 		sunlight_propagates = true,
 		paramtype2 = "facedir",
@@ -64,7 +94,13 @@ minetest.register_node("sl_controller:battery", {
 		drop = "",
 		is_ground_content = false,
 		sounds = default.node_sound_stone_defaults(),
-})
+	})
+end
+
+register_battery("", 1.0)
+register_battery("75", 0.75)
+register_battery("50", 0.5)
+register_battery("25", 0.25)
 
 minetest.register_node("sl_controller:battery_empty", {
 	description = "Battery",

sl_controller/config.lua

@@ -1,2 +1,2 @@
 -- Battery capacity in usec CPU time
-sl_controller.battery_capacity = tonumber(minetest.setting_get("battery_capacity")) or 10000000
+sl_controller.battery_capacity = tonumber(minetest.setting_get("battery_capacity")) or 5000000

sl_controller/controller.lua

@@ -14,16 +14,21 @@
 
 local sHELP = [[SaferLua Controller
 
-SaferLua is a subset of Lua with the following restrictions:
+ SaferLua is a subset of Lua with the following restrictions:
   - No loop keywords like: for, while, repeat,...
   - No table construction {..}
   - Limited set of available functions 
   - Store() as alternative to Lua tables
 
-The controller needs a battery nearby.
+ The controller needs a battery nearby.
-Don't remove the battery, it will be destroyed!
  
-See: goo.gl/WRWZgt
+ The controller will be restarted with every 
+ server start. That means, init() will be
+ called again and all variables are reset.
+ To store the data non-volatile, use a Server.
+ commands: $server_read(), $server_write().
+
+ See: goo.gl/WRWZgt
 ]]
 
 local Cache = {}
@@ -189,7 +194,7 @@ local function compile(pos, meta, number)
 	local loop = meta:get_string("loop")
 	local owner = meta:get_string("owner")
 	local env = table.copy(tCommands)
-	env.meta = {pos=pos, owner=owner, number=number}
+	env.meta = {pos=pos, owner=owner, number=number, error=error}
 	local code = safer_lua.init(pos, init, loop, env, error)
 	
 	if code then
@@ -282,12 +287,8 @@ local function on_timer(pos, elapsed)
 				no_battery(pos)
 				return false
 			end
-		else
-			stop_controller(pos) 
 		end
 		return res
-	else
-		stop_controller(pos)
 	end
 	return false
 end
@@ -329,6 +330,8 @@ local function on_receive_fields(pos, formname, fields, player)
 		meta:set_string("formspec", formspec5(sFunctionList, 1, sHELP))
 	elseif fields.start == "Start" then
 		start_controller(pos)
+		minetest.log("action", player:get_player_name() ..
+			" starts the sl_controller at ".. minetest.pos_to_string(pos))
 	elseif fields.stop == "Stop" then
 		stop_controller(pos)
 	elseif fields.functions then

sl_controller/init.lua

@@ -16,3 +16,4 @@ dofile(minetest.get_modpath("sl_controller") .. "/config.lua")
 dofile(minetest.get_modpath("sl_controller") .. "/controller.lua")
 dofile(minetest.get_modpath("sl_controller") .. "/commands.lua")
 dofile(minetest.get_modpath("sl_controller") .. "/battery.lua")
+dofile(minetest.get_modpath("sl_controller") .. "/server.lua")

sl_controller/readme.md

@@ -1,4 +1,4 @@
-SaferLua Controller [sl_controller] v0.01
+SaferLua Controller [sl_controller] v0.02
 =========================================
 
 
@@ -17,3 +17,4 @@ tubelib, safer_lua
 
 ### History
 - 2018-06-24  v0.01  * first draft
+- 2018-06-26  v0.02  * Battery and Server added

sl_controller/server.lua

@@ -0,0 +1,173 @@
+--[[
+
+	sl_controller
+	=============
+
+	Copyright (C) 2018 Joachim Stolberg
+
+	LGPLv2.1+
+	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 on_time(pos, elasped)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	local mem = tubelib.get_data(number, "memory") or DEFAULT_MEM
+	meta:set_string("infotext", "Server "..number..": ("..(mem.size or 0).."/"..SERVER_CAPA..")")
+	return true
+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)
+		tubelib.set_data(number, "memory", DEFAULT_MEM)
+		on_time(pos, 0)
+		minetest.get_node_timer(pos):start(20)
+	end,
+	
+	on_dig = function(pos, node, puncher, pointed_thing)
+		if minetest.is_protected(pos, puncher:get_player_name()) then
+			return
+		end
+		
+		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},
+	drop = "",
+	is_ground_content = false,
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_craft({
+	output = "sl_controller:server",
+	recipe = {
+		{"", "", ""},
+		{"default:mese_crystal_fragment", "tubelib:wlanchip", "default:mese_crystal_fragment"},
+		{"", "default:copper_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
+	else
+		return nil
+	end
+end
+
+local function write_value(mem, key, value)
+	if mem and mem.size < SERVER_CAPA then
+		if value == nil then
+			mem.size = mem.size - calc_size(mem.data[key])
+		else
+			mem.size = mem.size - calc_size(mem.data[key])
+			mem.size = mem.size + calc_size(value)
+		end
+		mem.data[key] = value
+	end
+end	
+
+tubelib.register_node("sl_controller:server", {}, {
+	on_recv_message = function(pos, topic, payload)
+		local meta = minetest.get_meta(pos)
+		if meta then
+			local number = meta:get_string("number")
+			local mem = tubelib.get_data(number, "memory") or DEFAULT_MEM
+			if topic == "read" then
+				return mem.data[payload]
+			elseif topic == "write" then
+				write_value(mem, payload.key, payload.value)
+				tubelib.set_data(number, "memory", mem)
+			else
+				return "unsupported"
+			end
+		end
+	end,
+})		
+
+
+sl_controller.register_function("server_read", {
+	cmnd = function(self, num, key) 
+		if type(key) == "string" then
+			return tubelib.send_request(num, "read", key)
+		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)
+		if type(key) == "string" and type(value) == "string" or type(value) == "number" then
+			tubelib.send_message(num, self.meta.owner, nil, "write", {key=key, value=value})
+		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"..
+		" 'key' must be a string. 'value' can be\n"..
+		" either a number or a string.\n"..
+		' example: $server_write("0123", "state", state)'
+})
+
+