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Store teleport tube DB more compactly (#45)

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Jude Melton-Houghton 2022-09-21 17:53:42 -04:00 committed by GitHub
parent b190d29d21
commit 8c251800db
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 4 deletions
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24
teleport_tube.lua
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@ -3,7 +3,7 @@ local filename=minetest.get_worldpath() .. "/teleport_tubes" -- Only used for ba
local storage=minetest.get_mod_storage()
local tp_tube_db = nil -- nil forces a read
local tp_tube_db_version = 3.0
local tp_tube_db_version = 4
-- cached rceiver list: hash(pos) => {receivers}
local cache = {}
@ -12,13 +12,29 @@ local function hash(pos)
return string.format("%.30g", minetest.hash_node_position(pos))
end
-- New entry format: <can receive (number)> ':' <channel (string)>
local function serialize_tube_db_entry(entry)
return entry.cr .. ":" .. entry.channel
end
local function deserialize_tube_db_entry(hash, str)
local sep = str:find(":", 2, true)
if not sep then return minetest.deserialize(str) end
local cr = tonumber(str:sub(1, sep - 1))
if not cr then return minetest.deserialize(str) end
local channel = str:sub(sep + 1)
local pos = minetest.get_position_from_hash(tonumber(hash))
return {x = pos.x, y = pos.y, z = pos.z, cr = cr, channel = channel}
end
local function save_tube_db()
-- reset tp-tube cache
cache = {}
local fields = {version = tp_tube_db_version}
for key, val in pairs(tp_tube_db) do
fields[key] = minetest.serialize(val)
fields[key] = serialize_tube_db_entry(val)
end
storage:from_table({fields = fields})
end
@ -28,7 +44,7 @@ local function save_tube_db_entry(hash)
cache = {}
local val = tp_tube_db[hash]
storage:set_string(hash, val and minetest.serialize(val) or "")
storage:set_string(hash, val and serialize_tube_db_entry(val) or "")
end
local function migrate_tube_db()
@ -53,7 +69,7 @@ local function read_tube_db()
for key, val in pairs(storage:to_table().fields) do
if tonumber(key) then
tp_tube_db[key] = minetest.deserialize(val)
tp_tube_db[key] = deserialize_tube_db_entry(key, val)
elseif key == "version" then
tp_tube_db.version = tonumber(val)
else