From 33c50c81ac2953bbd1f54a0a67a7dd2c5de1d001 Mon Sep 17 00:00:00 2001
From: Wuzzy <almikes@aol.com>
Date: Sun, 6 Jul 2014 21:16:25 +0200
Subject: [PATCH] Save status into playereffects.mt on shutdown

The file is stored in the world path. It is loaded again when the server starts again.
If the file does not exist, playereffects starts with an empty set of effects.
---
 init.lua | 66 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/init.lua b/init.lua
index 82f768f..f06e5a7 100644
--- a/init.lua
+++ b/init.lua
@@ -18,6 +18,27 @@ playereffects.inactive_effects = {}
 -- Variable for counting the effect_id
 playereffects.last_effect_id = 0
 
+--[=[ Load inactive_effects and last_effect_id from playereffects.mt, if this file exists  ]=]
+do
+	local filepath = minetest.get_worldpath().."/playereffects.mt"
+	local file = io.open(filepath, "r")
+	local string
+	if file then
+		minetest.log("action", "[playereffects] playereffects.mt opened.")
+		local string = file:read()
+		io.close(file)
+		if(string ~= nil) then
+			savetable = minetest.deserialize(string)
+			playereffects.inactive_effects = savetable.inactive_effects
+			minetest.debug("[playereffects] playereffects.mt successfully read.")
+			minetest.debug("[playereffects] inactive_effects = "..dump(playereffects.inactive_effects))
+			playereffects.last_effect_id = savetable.last_effect_id
+			minetest.debug("[playereffects] last_effect_id = "..dump(playereffects.last_effect_id))
+			
+		end
+	end
+end
+
 function playereffects.next_effect_id()
 	playereffects.last_effect_id = playereffects.last_effect_id + 1
 	return playereffects.last_effect_id
@@ -155,8 +176,7 @@ minetest.register_on_leaveplayer(function(player)
 		playereffects.inactive_effects[playername] = {}
 	end
 	for e=1,#effects do
-		local start_time = effects[e].start_time
-		local new_duration = os.difftime(leave_time, start_time)
+		local new_duration = effects[e].time_left - os.difftime(leave_time, effects[e].start_time)
 		local new_effect = effects[e]
 		new_effect.time_left = new_duration
 		table.insert(playereffects.inactive_effects[playername], new_effect)
@@ -164,6 +184,39 @@ minetest.register_on_leaveplayer(function(player)
 	end
 end)
 
+minetest.register_on_shutdown(function()
+	minetest.log("action", "[playereffects] Server shuts down. Rescuing data into playereffects.mt")
+	local shutdown_time = os.time()
+	local savetable = {}
+	local effects = playereffects.effects
+	local inactive_effects = playereffects.inactive_effects
+	for id,effect in pairs(effects) do
+		local new_duration = effect.time_left - os.difftime(shutdown_time, effect.start_time)
+		local new_effect = effect
+		new_effect.time_left = new_duration
+		if(inactive_effects[effect.playername] == nil) then
+			inactive_effects[effect.playername] = {}
+		end
+		table.insert(inactive_effects[effect.playername], new_effect)
+		playereffects.cancel_effect(effect.effect_id)
+	end
+
+	savetable.inactive_effects = inactive_effects
+	savetable.last_effect_id = playereffects.last_effect_id
+
+	savestring = minetest.serialize(savetable)
+
+	local filepath = minetest.get_worldpath().."/playereffects.mt"
+	local file = io.open(filepath, "w")
+	if file then
+		file:write(savestring)
+		io.close(file)
+		minetest.log("action", "[playereffects] Wrote playereffects data into "..filepath..".")
+	else
+		minetest.log("error", "[playereffects] Failed to write playereffects data into "..filepath..".")
+	end
+	
+end)
 
 minetest.register_on_joinplayer(function(player)
 	minetest.after(0, playereffects.join0, player)
@@ -190,11 +243,8 @@ minetest.register_globalstep(function()
 	end
 end)
 
---[[
-minetest.register_on_shutdown(function()
-	
-end)
-]]
+
+
 
 --[=[ HUD ]=]
 function playereffects.hud_update(player)
@@ -245,4 +295,4 @@ end
 
 -- EXAMPLES
 -- uncomment the line below if you want to try out the examples
--- dofile(minetest.get_modpath(minetest.get_current_modname()).."/examples.lua")
+dofile(minetest.get_modpath(minetest.get_current_modname()).."/examples.lua")