techpack/tubelib/command.lua

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2018-03-10 22:14:57 +01:00
--[[
Tube Library
============
Copyright (C) 2017 Joachim Stolberg
LGPLv2.1+
See LICENSE.txt for more information
command.lua:
See [api.md] for the interface documentation
]]--
-------------------------------------------------------------------
-- Data base storage
-------------------------------------------------------------------
local storage = minetest.get_mod_storage()
local NextNumber = minetest.deserialize(storage:get_string("NextNumber")) or 1
local Version = minetest.deserialize(storage:get_string("Version")) or 1
local Number2Pos = minetest.deserialize(storage:get_string("Number2Pos")) or {}
local function update_mod_storage()
storage:set_string("NextNumber", minetest.serialize(NextNumber))
storage:set_string("Version", minetest.serialize(Version))
storage:set_string("Number2Pos", minetest.serialize(Number2Pos))
storage:set_string("Key2Number", nil) -- not used any more
-- store data each hour
minetest.after(60*60, update_mod_storage)
print("[Tubelib] Data stored")
end
minetest.register_on_shutdown(function()
update_mod_storage()
end)
-- store data after one hour
minetest.after(60*60, update_mod_storage)
-- Key2Number will be generated at runtine
local Key2Number = {}
local Name2Name = {} -- translation table
-------------------------------------------------------------------
-- Local helper functions
-------------------------------------------------------------------
-- Localize functions to avoid table lookups (better performance).
local string_find = string.find
local string_split = string.split
local tubelib_NodeDef = tubelib.NodeDef
local get_neighbor_pos = tubelib.get_neighbor_pos
local read_node_with_vm = tubelib.read_node_with_vm
-- Translate from facedir to contact side of the other node
-- (left for one is right for the other node)
local FacedirToSide = {[0] = "F", "L", "B", "R", "U", "D"}
-- Generate a key string based on the given pos table,
-- Used internaly as table key,
local function get_key_str(pos)
pos = minetest.pos_to_string(pos)
return string.sub(pos, 2, -2)
end
-- Determine position related node number for addressing purposes
local function get_number(pos)
local key = get_key_str(pos)
if not Key2Number[key] then
Key2Number[key] = NextNumber
NextNumber = NextNumber + 1
end
return string.format("%.04u", Key2Number[key])
end
-- Determine the contact side of the node at the given pos
-- param facedir: facedir to the node
local function get_node_side(npos, facedir)
local node = minetest.get_node_or_nil(npos) or read_node_with_vm(npos)
if facedir < 4 then
facedir = (facedir - node.param2 + 4) % 4
end
return FacedirToSide[facedir], node
end
local function generate_Key2Number()
local key
for num,item in pairs(Number2Pos) do
key = get_key_str(item.pos)
Key2Number[key] = num
end
end
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local function not_protected(pos, placer_name, clicker_name)
local meta = minetest.get_meta(pos)
if meta then
local cached_name = meta:get_string("tubelib_cached_name")
if placer_name and (placer_name == cached_name or not minetest.is_protected(pos, placer_name)) then
meta:set_string("tubelib_cached_name", placer_name)
if clicker_name == nil or not minetest.is_protected(pos, clicker_name) then
return true
end
end
end
return false
end
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-------------------------------------------------------------------
-- API helper functions
-------------------------------------------------------------------
-- Check the given list of numbers.
-- Returns true if number(s) is/are valid and point to real nodes.
function tubelib.check_numbers(numbers)
if numbers then
for _,num in ipairs(string_split(numbers, " ")) do
if Number2Pos[num] == nil then
return false
end
end
return true
end
return false
end
-- Function returns { pos, name } for the node on the given position number.
function tubelib.get_node_info(dest_num)
if Number2Pos[dest_num] then
return Number2Pos[dest_num]
end
return nil
end
-- Function returns the node number from the given position or
-- nil, if no node number for this position is assigned.
function tubelib.get_node_number(pos)
local key = get_key_str(pos)
local num = Key2Number[key]
print("key", key, "num", num)
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if num then
num = string.format("%.04u", num)
if Number2Pos[num] and Number2Pos[num].name then
return num
end
end
return nil
end
-- Store any node number related, additional data
-- param number: node number, returned by tubelib.add_node
-- param name: name of the data (string)
-- param data: any data (number, string, table)
function tubelib.set_data(number, name, data)
if Number2Pos[number] and type(name) == "string" then
Number2Pos[number]["u_"..name] = data
end
end
-- Read node number related data
-- param number: node number, returned by tubelib.add_node
-- param name: name of the data (string)
function tubelib.get_data(number, name)
if Number2Pos[number] and type(name) == "string" then
return Number2Pos[number]["u_"..name]
end
return nil
end
-------------------------------------------------------------------
-- Node construction/destruction functions
-------------------------------------------------------------------
-- Add node to the tubelib lists.
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-- Function determines and returns the node position number,
-- needed for message communication.
function tubelib.add_node(pos, name)
-- store position
local number = get_number(pos)
Number2Pos[number] = {
pos = pos,
name = name,
}
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return number
end
-- Function removes the node from the tubelib lists.
function tubelib.remove_node(pos)
local number = get_number(pos)
if Number2Pos[number] then
Number2Pos[number] = {
pos = pos,
name = nil,
time = minetest.get_day_count() -- used for aging
}
end
end
-------------------------------------------------------------------
-- Node register function
-------------------------------------------------------------------
-- Register node for tubelib communication
-- Call this function only at load time!
-- Param name: The node name like "tubelib:pusher"
-- Param add_names: Alternativ node names if needded, e.g.: "tubelib:pusher_active"
-- Param node_definition: A table according to:
-- {
-- on_pull_item = func(pos, side, player_name),
-- on_push_item = func(pos, side, item, player_name),
-- on_unpull_item = func(pos, side, item, player_name),
-- on_recv_message = func(pos, topic, payload),
-- }
function tubelib.register_node(name, add_names, node_definition)
tubelib_NodeDef[name] = node_definition
-- store facedir table for all known node names
Name2Name[name] = name
for _,n in ipairs(add_names) do
Name2Name[n] = name
end
if node_definition.on_pull_item or node_definition.on_push_item or
node_definition.is_pusher then
tubelib.KnownNodes[name] = true
for _,n in ipairs(add_names) do
tubelib.KnownNodes[n] = true
end
end
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end
-------------------------------------------------------------------
-- Send message functions
-------------------------------------------------------------------
function tubelib.send_message(numbers, placer_name, clicker_name, topic, payload)
for _,num in ipairs(string_split(numbers, " ")) do
if Number2Pos[num] and Number2Pos[num].name then
local data = Number2Pos[num]
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if not_protected(data.pos, placer_name, clicker_name) then
if tubelib_NodeDef[data.name] and tubelib_NodeDef[data.name].on_recv_message then
tubelib_NodeDef[data.name].on_recv_message(data.pos, topic, payload)
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end
end
end
end
end
function tubelib.send_request(number, topic, payload)
if Number2Pos[number] and Number2Pos[number].name then
local data = Number2Pos[number]
if tubelib_NodeDef[data.name] and tubelib_NodeDef[data.name].on_recv_message then
return tubelib_NodeDef[data.name].on_recv_message(data.pos, topic, payload)
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end
end
return false
end
-------------------------------------------------------------------
-- Client side Push/Pull item functions
-------------------------------------------------------------------
function tubelib.pull_items(pos, side, player_name)
local npos, facedir = get_neighbor_pos(pos, side)
if npos == nil then return end
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local nside, node = get_node_side(npos, facedir)
local name = Name2Name[node.name]
if tubelib_NodeDef[name] and tubelib_NodeDef[name].on_pull_item then
return tubelib_NodeDef[name].on_pull_item(npos, nside, player_name)
end
return nil
end
function tubelib.push_items(pos, side, items, player_name)
local npos, facedir = get_neighbor_pos(pos, side)
if npos == nil then return end
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local nside, node = get_node_side(npos, facedir)
local name = Name2Name[node.name]
if tubelib_NodeDef[name] and tubelib_NodeDef[name].on_push_item then
return tubelib_NodeDef[name].on_push_item(npos, nside, items, player_name)
elseif node.name == "air" then
minetest.add_item(npos, items)
return true
end
return false
end
function tubelib.unpull_items(pos, side, items, player_name)
local npos, facedir = get_neighbor_pos(pos, side)
if npos == nil then return end
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local nside, node = get_node_side(npos, facedir)
local name = Name2Name[node.name]
if tubelib_NodeDef[name] and tubelib_NodeDef[name].on_unpull_item then
return tubelib_NodeDef[name].on_unpull_item(npos, nside, items, player_name)
end
return false
end
-------------------------------------------------------------------
-- Server side helper functions
-------------------------------------------------------------------
-- Get one item from the given ItemList. The position within the list
-- is incremented each time so that different item stacks will be considered.
-- Returns nil if ItemList is empty.
function tubelib.get_item(meta, listname)
if meta == nil or meta.get_inventory == nil then return nil end
local inv = meta:get_inventory()
if inv:is_empty(listname) then
return nil
end
local size = inv:get_size(listname)
local startpos = meta:get_int("tubelib_startpos") or 0
for idx = startpos, startpos+size do
idx = (idx % size) + 1
local items = inv:get_stack(listname, idx)
if items:get_count() > 0 then
local taken = items:take_item(1)
inv:set_stack(listname, idx, items)
meta:set_int("tubelib_startpos", idx)
return taken
end
end
meta:set_int("tubelib_startpos", 0)
return nil
end
-- Get one item from the given ItemList, specified by stack number (1..n).
-- Returns nil if ItemList is empty.
function tubelib.get_this_item(meta, listname, number)
if meta == nil or meta.get_inventory == nil then return nil end
local inv = meta:get_inventory()
if inv:is_empty(listname) then
return nil
end
local items = inv:get_stack(listname, number)
if items:get_count() > 0 then
local taken = items:take_item(1)
inv:set_stack(listname, number, items)
return taken
end
return nil
end
-- Put the given item into the given ItemList.
-- Function returns false if ItemList is full.
function tubelib.put_item(meta, listname, item)
if meta == nil or meta.get_inventory == nil then return false end
local inv = meta:get_inventory()
if inv:room_for_item(listname, item) then
inv:add_item(listname, item)
return true
end
return false
end
-- Take the number of items from the given ItemList.
-- Returns nil if the requested number is not available.
function tubelib.get_num_items(meta, listname, num)
if meta == nil or meta.get_inventory == nil then return nil end
local inv = meta:get_inventory()
if inv:is_empty(listname) then
return nil
end
local size = inv:get_size(listname)
for idx = 1, size do
local items = inv:get_stack(listname, idx)
if items:get_count() >= num then
local taken = items:take_item(num)
inv:set_stack(listname, idx, items)
return taken
end
end
return nil
end
-- Return "full", "loaded", or "empty" depending
-- on the number of fuel stack items.
-- Function only works on fuel inventories with one stacks/99 items
function tubelib.fuelstate(meta, listname, item)
if meta == nil or meta.get_inventory == nil then return nil end
local inv = meta:get_inventory()
if inv:is_empty(listname) then
return "empty"
end
local list = inv:get_list(listname)
if #list == 1 and list[1]:get_count() == 99 then
return "full"
else
return "loaded"
end
end
-------------------------------------------------------------------------------
-- Data Maintenance
-------------------------------------------------------------------------------
local function data_maintenance()
print("[Tubelib] Data maintenance started")
if Version == 1 then
-- Add day_count for aging of unused positions
for num,item in pairs(Number2Pos) do
if Number2Pos[num].name == nil then
Number2Pos[num].time = minetest.get_day_count()
end
end
Version = 2
else
-- Remove old unused positions
local Tbl = table.copy(Number2Pos)
Number2Pos = {}
local day_cnt = minetest.get_day_count()
for num,item in pairs(Tbl) do
if item.name then
Number2Pos[num] = item
-- data not older than 5 real days
elseif item.time and (item.time + 360) > day_cnt then
Number2Pos[num] = item
else
print("Position deleted", num)
end
end
end
print("[Tubelib] Data maintenance finished")
end
generate_Key2Number()
-- maintain data after one minute
-- (minetest.get_day_count() will not be valid at start time)
minetest.after(60, data_maintenance)