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Save forceloaded blocks file periodically (#8535)

saves the forceloaded blocks periodically.
checks every 10 seconds if the forceloaded blocks got changed in-game
and persists them on-disk if that's the case
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thomasrudin authored and rubenwardy committed Jun 10, 2019
1 parent a687efa commit 9a07792f4d79ae5b386b781e6e73377f5758ee6a
Showing with 33 additions and 2 deletions.
  1. +33 −2 builtin/game/forceloading.lua
@@ -8,6 +8,9 @@ local blocks_forceloaded
local blocks_temploaded = {}
local total_forceloaded = 0

-- true, if the forceloaded blocks got changed (flag for persistence on-disk)
local forceload_blocks_changed = false

local BLOCKSIZE = core.MAP_BLOCKSIZE
local function get_blockpos(pos)
return {
@@ -31,6 +34,9 @@ local function get_relevant_tables(transient)
end

function core.forceload_block(pos, transient)
-- set changed flag
forceload_blocks_changed = true

local blockpos = get_blockpos(pos)
local hash = core.hash_node_position(blockpos)
local relevant_table, other_table = get_relevant_tables(transient)
@@ -51,6 +57,9 @@ function core.forceload_block(pos, transient)
end

function core.forceload_free_block(pos, transient)
-- set changed flag
forceload_blocks_changed = true

local blockpos = get_blockpos(pos)
local hash = core.hash_node_position(blockpos)
local relevant_table, other_table = get_relevant_tables(transient)
@@ -95,6 +104,28 @@ core.after(5, function()
end
end)

core.register_on_shutdown(function()
-- persists the currently forceloaded blocks to disk
local function persist_forceloaded_blocks()
write_file(wpath.."/force_loaded.txt", blocks_forceloaded)
end)
end

-- periodical forceload persistence
local function periodically_persist_forceloaded_blocks()

-- only persist if the blocks actually changed
if forceload_blocks_changed then
persist_forceloaded_blocks()

-- reset changed flag
forceload_blocks_changed = false
end

-- recheck after some time
core.after(10, periodically_persist_forceloaded_blocks)
end

-- persist periodically
core.after(5, periodically_persist_forceloaded_blocks)

-- persist on shutdown
core.register_on_shutdown(persist_forceloaded_blocks)

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