Fix bugs regarding disconnected players and unsanitized command input

ca_effects/hud_overlay.lua

@@ -14,6 +14,8 @@ local EFFECT_NAME = "climate_api:hud_overlay"
 local handles = {}
 local function apply_hud(pname, weather, hud)
 	local player = minetest.get_player_by_name(pname)
+	if player == nil then return end
+
 	if handles[pname] == nil then handles[pname] = {} end
 	if handles[pname][weather] ~= nil then
 		player:hud_remove(handles[pname][weather])
@@ -48,9 +50,11 @@ local function apply_hud(pname, weather, hud)
 end
 
 local function remove_hud(pname, weather, hud)
-	if handles[pname] == nil or handles[pname][weather] == nil then return end
-	local handle = handles[pname][weather]
 	local player = minetest.get_player_by_name(pname)
+	if player == nil then return end
+	if handles[pname] == nil or handles[pname][weather] == nil then return end
+
+	local handle = handles[pname][weather]
 	player:hud_remove(handle)
 	handles[pname][weather] = nil
 end

lib/commands.lua

@@ -65,7 +65,7 @@ minetest.register_chatcommand("set_base_heat", {
 			return
 		end
 		if param == "auto" then param = 0 end
-		climate_mod.settings.heat = tonumber(param)
+		climate_mod.settings.heat = tonumber(param) or 0
 		minetest.chat_send_player(playername, "Base heat changed")
 	end
 })
@@ -84,7 +84,7 @@ minetest.register_chatcommand("set_heat", {
 			climate_mod.forced_enviroment.heat = nil
 			minetest.chat_send_player(playername, "Heat value reset")
 		else
-			climate_mod.forced_enviroment.heat = tonumber(param)
+			climate_mod.forced_enviroment.heat = tonumber(param) or 0
 			minetest.chat_send_player(playername, "Heat value changed")
 		end
 	end
@@ -96,12 +96,12 @@ minetest.register_chatcommand("set_base_humidity", {
 	description = "Override the weather algorithm's base humidity",
 	privs = { weather = true },
 	func = function(playername, param)
+		if param == "auto" then param = 0 end
 		if param == nil or param == "" then
 			minetest.chat_send_player(playername, "Provide a number to modify the base humidity")
 			return
 		end
-		if param == "auto" then param = 0 end
-		climate_mod.settings.humidity = tonumber(param)
+		climate_mod.settings.humidity = tonumber(param) or 0
 		minetest.chat_send_player(playername, "Base humidity changed")
 	end
 })
@@ -120,7 +120,7 @@ minetest.register_chatcommand("set_humidity", {
 			climate_mod.forced_enviroment.humidity = nil
 			minetest.chat_send_player(playername, "Humidity value reset")
 		else
-			climate_mod.forced_enviroment.humidity = tonumber(param)
+			climate_mod.forced_enviroment.humidity = tonumber(param) or 0
 			minetest.chat_send_player(playername, "Humidity value changed")
 		end
 	end
@@ -138,21 +138,23 @@ minetest.register_chatcommand("set_wind", {
 		end
 		local arguments = {}
 		for w in param:gmatch("%S+") do table.insert(arguments, w) end
-		local wind_x = arguments[1]
-		local wind_z = arguments[2]
-		if wind_x == "auto" then
+		local arg1 = arguments[1]
+		local wind_x = tonumber(arguments[1])
+		local wind_z = tonumber(arguments[2])
+		if arg1 == "auto" then
 			climate_mod.forced_enviroment.wind = nil
+			minetest.chat_send_player(playername, "Wind reset")
 		elseif wind_x == nil or wind_z == nil then
 			minetest.chat_send_player(playername, "Invalid wind configuration")
 		else
 			climate_mod.forced_enviroment.wind = vector.new({
-				x = tonumber(wind_x),
+				x = wind_x,
 				y = 0,
-				z = tonumber(wind_z)
+				z = wind_z
 			})
-		end
 			minetest.chat_send_player(playername, "Wind changed")
 		end
+	end
 })
 
 -- display current mod config

lib/influences.lua

@@ -50,14 +50,14 @@ end)
 
 climate_api.register_influence("light", function(pos)
 	pos = vector.add(pos, {x = 0, y = 1, z = 0})
-	return minetest.env:get_node_light(pos)
+	return minetest.env:get_node_light(pos) or 0
 end)
 
 climate_api.register_influence("daylight", function(pos)
 	pos = vector.add(pos, {x = 0, y = 1, z = 0})
-	return minetest.env:get_node_light(pos, 0.5)
+	return minetest.env:get_node_light(pos, 0.5) or 0
 end)
 
 climate_api.register_global_influence("time",
-	minetest.get_timeofday()
+	minetest.get_timeofday
 )

lib/main.lua

@@ -1,6 +1,15 @@
 local GSCYCLE			=  0.03	* climate_mod.settings.tick_speed	-- only process event loop after this amount of time
 local WORLD_CYCLE = 15.00	* climate_mod.settings.tick_speed	-- only update global environment influences after this amount of time
 
+local function is_connected(playername)
+	local connected = minetest.get_connected_players()
+	for _, player in ipairs(connected) do
+		local name = player:get_player_name()
+		if playername == name then return true end
+	end
+	return false
+end
+
 local gs_timer = 0
 local world_timer = 0
 minetest.register_globalstep(function(dtime)
@@ -15,7 +24,17 @@ minetest.register_globalstep(function(dtime)
 		climate_mod.global_environment = climate_mod.trigger.get_global_environment()
 	end
 
+
 	local previous_effects = table.copy(climate_mod.current_effects)
+	-- skip weather changes for offline players
+	for effect, data in pairs(previous_effects) do
+		for playername, _ in pairs(data) do
+			if not is_connected(playername) then
+				previous_effects[effect][playername] = nil
+			end
+		end
+	end
+
 	local current_effects = climate_mod.trigger.get_active_effects()
 
 	for name, effect in pairs(climate_mod.effects) do

lib/skybox_merger.lua

@@ -64,7 +64,7 @@ end
 
 local function set_skybox(playername, sky)
 	local player = minetest.get_player_by_name(playername)
-	if not player.get_stars then return end
+	if player == nil or	not player.get_stars then return end
 	player:set_sky(sky.sky_data)
 	player:set_clouds(sky.cloud_data)
 	player:set_moon(sky.moon_data)
@@ -85,7 +85,7 @@ function skybox.update(playername)
 		if right.priority == nil then right.priority = 1 end
 		return left.priority < right.priority
 	end)
-	for i=1,#numbered_layers do
+	for i = 1, #numbered_layers do
 		sky = merge_tables(sky, numbered_layers[i])
 	end
 	set_skybox(playername, sky)

lib/trigger.lua

@@ -76,7 +76,12 @@ end
 function trigger.get_active_effects()
 	local environments = {}
 	for _, player in ipairs(minetest.get_connected_players()) do
-		environments[player:get_player_name()] = trigger.get_player_environment(player)
+		local playername = player:get_player_name()
+		local hp = player:get_hp()
+		-- skip weather presets for dead players
+		if hp ~= nil and hp > 0 then
+			environments[playername] = trigger.get_player_environment(player)
+		end
 	end
 
 	local effects = {}