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local S = minetest.get_translator("pipeworks")
local filename=minetest.get_worldpath() .. "/teleport_tubes"
local tp_tube_db = nil -- nil forces a read
local tp_tube_db_version = 2.0
-- cached rceiver list: hash(pos) => {receivers}
local cache = {}
local function hash(pos)
return string.format("%.30g", minetest.hash_node_position(pos))
end
local function save_tube_db()
local file, err = io.open(filename, "w")
if file then
tp_tube_db.version = tp_tube_db_version
file:write(minetest.serialize(tp_tube_db))
tp_tube_db.version = nil
io.close(file)
else
error(err)
end
-- reset tp-tube cache
cache = {}
end
local function migrate_tube_db()
local tmp_db = {}
tp_tube_db.version = nil
for _, val in pairs(tp_tube_db) do
if(val.channel ~= "") then -- skip unconfigured tubes
tmp_db[hash(val)] = val
end
end
tp_tube_db = tmp_db
save_tube_db()
end
local function read_tube_db()
local file = io.open(filename, "r")
if file ~= nil then
local file_content = file:read("*all")
io.close(file)
if file_content and file_content ~= "" then
tp_tube_db = minetest.deserialize(file_content)
if(not tp_tube_db.version or tonumber(tp_tube_db.version) < tp_tube_db_version) then
migrate_tube_db()
end
tp_tube_db.version = nil -- we add it back when saving
return tp_tube_db -- we read sucessfully
end
end
tp_tube_db = {}
return tp_tube_db
end
-- debug formatter for coordinates used below
local fmt = function(pos)
return pos.x..", "..pos.y..", "..pos.z
end
-- updates or adds a tube
local function set_tube(pos, channel, can_receive)
local tubes = tp_tube_db or read_tube_db()
local hash = hash(pos)
local tube = tubes[hash]
if tube then
tube.channel = channel
tube.cr = can_receive
save_tube_db()
return
end
-- we haven't found any tp tube to update, so lets add it
-- but sanity check that the hash has not already been inserted.
-- if so, complain very loudly and refuse the update so the player knows something is amiss.
-- to catch regressions of https://github.com/minetest-mods/pipeworks/issues/166
local existing = tp_tube_db[hash]
if existing ~= nil then
local e = "error"
minetest.log(e, "pipeworks teleport tube update refused due to position hash collision")
minetest.log(e, "collided hash: "..hash)
minetest.log(e, "tried-to-place tube: "..fmt(pos))
minetest.log(e, "existing tube: "..fmt(existing))
return
end
tp_tube_db[hash] = {x=pos.x,y=pos.y,z=pos.z,channel=channel,cr=can_receive}
save_tube_db()
end
local function remove_tube(pos)
local tubes = tp_tube_db or read_tube_db()
tubes[hash(pos)] = nil
save_tube_db()
end
local function read_node_with_vm(pos)
local vm = VoxelManip()
local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
local data = vm:get_data()
local area = VoxelArea:new({MinEdge = MinEdge, MaxEdge = MaxEdge})
return minetest.get_name_from_content_id(data[area:index(pos.x, pos.y, pos.z)])
end
local function get_receivers(pos, channel)
local hash = minetest.hash_node_position(pos)
if cache[hash] then
-- re-use cached result
return cache[hash]
end
local tubes = tp_tube_db or read_tube_db()
local receivers = {}
local dirty = false
for key, val in pairs(tubes) do
-- skip all non-receivers and the tube that it came from as early as possible, as this is called often
if (val.cr == 1 and val.channel == channel and (val.x ~= pos.x or val.y ~= pos.y or val.z ~= pos.z)) then
local is_loaded = (minetest.get_node_or_nil(val) ~= nil)
local node_name = is_loaded and minetest.get_node(pos).name or read_node_with_vm(val)
if minetest.registered_nodes[node_name] and minetest.registered_nodes[node_name].is_teleport_tube then
table.insert(receivers, val)
else
tp_tube_db[key] = nil
dirty = true
end
end
end
if dirty then
save_tube_db()
end
-- cache the result for next time
cache[hash] = receivers
return receivers
end
local function update_meta(meta, can_receive)
meta:set_int("can_receive", can_receive and 1 or 0)
local cr_state = can_receive and "on" or "off"
local itext = S("Channels are public by default").."\n"..
S("Use <player>:<channel> for fully private channels").."\n"..
S("Use <player>\\;<channel> for private receivers")
meta:set_string("formspec",
"size[8.5,3.5]"..
"image[0.2,o;1,1;pipeworks_teleport_tube_inv.png]"..
"label[1.2,0.2;"..S("Teleporting Tube").."]"..
"field[0.5,1.6;4.6,1;channel;"..S("Channel")..";${channel}]"..
"button[4.8,1.3;1.5,1;set_channel;"..S("Set").."]"..
"label[7.0,0;"..S("Receive").."]"..
"image_button[7.0,0.5;1,0.6;pipeworks_button_" .. cr_state .. ".png;cr" .. (can_receive and 0 or 1) .. ";;;false;pipeworks_button_interm.png]"..
"button_exit[6.3,1.3;2,1;close;"..S("Close").."]"..
"label[0.2,2.3;"..itext.."]"..
default.gui_bg..
default.gui_bg_img)
end
pipeworks.register_tube("pipeworks:teleport_tube", {
description = S("Teleporting Pneumatic Tube Segment"),
inventory_image = "pipeworks_teleport_tube_inv.png",
noctr = { "pipeworks_teleport_tube_noctr.png" },
plain = { "pipeworks_teleport_tube_plain.png" },
ends = { "pipeworks_teleport_tube_end.png" },
short = "pipeworks_teleport_tube_short.png",
node_def = {
is_teleport_tube = true,
tube = {
can_go = function(pos,node,velocity,stack)
velocity.x = 0
velocity.y = 0
velocity.z = 0
local channel = minetest.get_meta(pos):get_string("channel")
if channel == "" then return {} end
local target = get_receivers(pos, channel)
if target[1] == nil then return {} end
local d = math.random(1,#target)
pos.x = target[d].x
pos.y = target[d].y
pos.z = target[d].z
return pipeworks.meseadjlist
end
},
on_construct = function(pos)
local meta = minetest.get_meta(pos)
update_meta(meta, true)
meta:set_string("infotext", S("Unconfigured Teleportation Tube"))
end,
on_receive_fields = function(pos,formname,fields,sender)
if not fields.channel -- ignore escaping or clientside manipulation of the form
or (fields.quit and not fields.key_enter_field)
or not pipeworks.may_configure(pos, sender) then
return
end
local new_channel = tostring(fields.channel):trim()
local meta = minetest.get_meta(pos)
local can_receive = meta:get_int("can_receive")
-- check for private channels each time before actually changing anything
-- to not even allow switching between can_receive states of private channels
if new_channel ~= "" then
local sender_name = sender:get_player_name()
local name, mode = new_channel:match("^([^:;]+)([:;])")
if name and mode and name ~= sender_name then
--channels starting with '[name]:' can only be used by the named player
if mode == ":" then
minetest.chat_send_player(sender_name, S("Sorry, channel '@1' is reserved for exclusive use by @2",
new_channel, name))
return
--channels starting with '[name];' can be used by other players, but cannot be received from
elseif mode == ";" and (fields.cr1 or (can_receive ~= 0 and not fields.cr0)) then
minetest.chat_send_player(sender_name, S("Sorry, receiving from channel '@1' is reserved for @2",
new_channel, name))
return
end
end
end
local dirty = false
-- was the channel changed?
local channel = meta:get_string("channel")
if new_channel ~= channel and (fields.key_enter_field == "channel" or fields.set_channel) then
channel = new_channel
meta:set_string("channel", channel)
dirty = true
end
-- test if a can_receive button was pressed
if fields.cr0 and can_receive ~= 0 then
can_receive = 0
update_meta(meta, false)
dirty = true
elseif fields.cr1 and can_receive ~= 1 then
can_receive = 1
update_meta(meta, true)
dirty = true
end
-- save if we changed something, handle the empty channel while we're at it
if dirty then
if channel ~= "" then
set_tube(pos, channel, can_receive)
local cr_description = (can_receive == 1) and "sending and receiving" or "sending"
meta:set_string("infotext", S("Teleportation Tube @1 on '@2'", cr_description, channel))
else
-- remove empty channel tubes, to not have to search through them
remove_tube(pos)
meta:set_string("infotext", S("Unconfigured Teleportation Tube"))
end
end
end,
on_destruct = function(pos)
remove_tube(pos)
end
},
})
minetest.register_craft( {
output = "pipeworks:teleport_tube_1 2",
recipe = {
{ "basic_materials:plastic_sheet", "basic_materials:plastic_sheet", "basic_materials:plastic_sheet" },
{ "default:desert_stone", "default:mese", "default:desert_stone" },
{ "basic_materials:plastic_sheet", "basic_materials:plastic_sheet", "basic_materials:plastic_sheet" }
},
})
if minetest.get_modpath("mesecons_mvps") ~= nil then
mesecon.register_on_mvps_move(function(moved_nodes)
for _, n in ipairs(moved_nodes) do
if string.find(n.node.name, "pipeworks:teleport_tube") ~= nil then
local meta = minetest.get_meta(n.pos)
set_tube(n.pos, meta:get_string("channel"), meta:get_int("can_receive"))
end
end
end)
end
-- Expose teleport tube database API for other mods
pipeworks.tptube = {
hash = hash,
save_tube_db = save_tube_db,
get_db = function() return tp_tube_db or read_tube_db() end,
tp_tube_db_version = tp_tube_db_version
}