forked from mtcontrib/pipeworks
use a hashmap to manage teleportation tubes, to speedup lookups and tablemodifications
This commit is contained in:
Tim
parent
5b026d2cc7
commit
fb98963810
@ -1,6 +1,35 @@
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local filename=minetest.get_worldpath() .. "/teleport_tubes"
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local tp_tube_db = nil -- nil forces a read
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local tp_tube_db_version = 2.0
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local function hash(pos)
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return string.format("%d", minetest.hash_node_position(pos))
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end
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local function save_tube_db()
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local file, err = io.open(filename, "w")
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if file then
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tp_tube_db.version = tp_tube_db_version
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file:write(minetest.serialize(tp_tube_db))
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tp_tube_db.version = nil
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io.close(file)
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else
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error(err)
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end
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end
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local function migrate_tube_db()
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local tmp_db = {}
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tp_tube_db.version = nil
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for key, val in pairs(tp_tube_db) do
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if(val.channel ~= "") then -- skip unconfigured tubes
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tmp_db[hash(val)] = val
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end
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end
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tp_tube_db = tmp_db
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save_tube_db()
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end
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local function read_tube_db()
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local file = io.open(filename, "r")
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@ -10,6 +39,10 @@ local function read_tube_db()
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if file_content and file_content ~= "" then
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tp_tube_db = minetest.deserialize(file_content)
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if(not tp_tube_db.version or tonumber(tp_tube_db.version) < tp_tube_db_version) then
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migrate_tube_db()
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end
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tp_tube_db.version = nil -- we add it back when saving
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return tp_tube_db -- we read sucessfully
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end
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end
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@ -17,43 +50,26 @@ local function read_tube_db()
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return tp_tube_db
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end
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local function save_tube_db()
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local file, err = io.open(filename, "w")
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if file then
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file:write(minetest.serialize(tp_tube_db))
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io.close(file)
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else
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error(err)
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end
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end
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-- updates or adds a tube
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local function set_tube(pos, channel, can_receive)
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local tubes = tp_tube_db or read_tube_db()
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for _, val in ipairs(tubes) do
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if val.x == pos.x and val.y == pos.y and val.z == pos.z then
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val.channel = channel
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val.cr = can_receive
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local hash = hash(pos)
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local tube = tubes[hash]
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if tube then
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tube.channel = channel
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tube.cr = can_receive
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save_tube_db()
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return
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end
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end
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-- we haven't found any tp tube to update, so lets add it
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table.insert(tp_tube_db,{x=pos.x,y=pos.y,z=pos.z,channel=channel,cr=can_receive})
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tp_tube_db[hash] = {x=pos.x,y=pos.y,z=pos.z,channel=channel,cr=can_receive}
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save_tube_db()
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end
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local function remove_tube(pos)
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local tubes = tp_tube_db or read_tube_db()
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local newtbl = {}
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for _, val in ipairs(tubes) do
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if val.channel ~= "" -- remove also any empty channels when we stumble over them
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and (val.x ~= pos.x or val.y ~= pos.y or val.z ~= pos.z) then
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table.insert(newtbl, val)
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end
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end
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tp_tube_db = newtbl
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tubes[hash(pos)] = nil
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save_tube_db()
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end
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@ -68,8 +84,8 @@ end
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local function get_receivers(pos, channel)
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local tubes = tp_tube_db or read_tube_db()
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local receivers = {}
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local changed = false
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for _, val in ipairs(tubes) do
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local dirty = false
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for key, val in pairs(tubes) do
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-- skip all non-receivers and the tube that it came from as early as possible, as this is called often
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if (val.cr == 1 and val.channel == channel and (val.x ~= pos.x or val.y ~= pos.y or val.z ~= pos.z)) then
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local is_loaded = (minetest.get_node_or_nil(val) ~= nil)
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@ -78,19 +94,12 @@ local function get_receivers(pos,channel)
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if minetest.registered_nodes[node_name] and minetest.registered_nodes[node_name].is_teleport_tube then
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table.insert(receivers, val)
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else
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val.to_remove = true
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changed = true
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tp_tube_db[key] = nil
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dirty = true
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end
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end
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end
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if changed then
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local updated = {}
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for _, val in ipairs(tubes) do
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if not val.to_remove then
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table.insert(updated, val)
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end
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end
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tp_tube_db = updated
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if dirty then
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save_tube_db()
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end
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return receivers
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@ -121,11 +130,13 @@ pipeworks.register_tube("pipeworks:teleport_tube","Teleporting Pneumatic Tube Se
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velocity.x = 0
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velocity.y = 0
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velocity.z = 0
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local meta = minetest.get_meta(pos)
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local channel = meta:get_string("channel")
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local channel = minetest.get_meta(pos):get_string("channel")
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if channel == "" then return {} end
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local target = get_receivers(pos, channel)
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if target[1] == nil then return {} end
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local d = math.random(1,#target)
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pos.x = target[d].x
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pos.y = target[d].y
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