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--nodedb.lua
--database of all nodes that have 'save_in_nodedb' field set to true in node definition
--serialization format:
--(2byte z) (2byte y) (2byte x) (2byte contentid)
--contentid := (14bit nodeid, 2bit param2)
local function int_to_bytes(i)
local x=i+32768--clip to positive integers
local cH = math.floor(x / 256) % 256;
local cL = math.floor(x ) % 256;
return(string.char(cH, cL));
end
local function bytes_to_int(bytes)
local t={string.byte(bytes,1,-1)}
local n =
t[1] * 256 +
t[2]
return n-32768
end
local function l2b(x)
return x%4
end
local function u14b(x)
return math.floor(x/4)
end
local ndb={}
--local variables for performance
local ndb_nodeids={}
local ndb_nodes={}
local function ndbget(x,y,z)
local ny=ndb_nodes[y]
if ny then
local nx=ny[x]
if nx then
return nx[z]
end
end
return nil
end
local function ndbset(x,y,z,v)
if not ndb_nodes[y] then
ndb_nodes[y]={}
end
if not ndb_nodes[y][x] then
ndb_nodes[y][x]={}
end
ndb_nodes[y][x][z]=v
end
--load
--nodeids get loaded by advtrains init.lua and passed here
function ndb.load_data(data)
ndb_nodeids = data and data.nodeids or {}
end
local path=minetest.get_worldpath().."/advtrains_ndb2"
local file, err = io.open(path, "r")
if not file then
atprint("load ndb failed: ", err or "Unknown Error")
else
local cnt=0
local hst_z=file:read(2)
local hst_y=file:read(2)
local hst_x=file:read(2)
local cid=file:read(2)
while hst_z and hst_y and hst_x and cid and #hst_z==2 and #hst_y==2 and #hst_x==2 and #cid==2 do
ndbset(bytes_to_int(hst_x), bytes_to_int(hst_y), bytes_to_int(hst_z), bytes_to_int(cid))
cnt=cnt+1
hst_z=file:read(2)
hst_y=file:read(2)
hst_x=file:read(2)
cid=file:read(2)
end
atprint("nodedb: read", cnt, "nodes.")
file:close()
end
--save
function ndb.save_data()
local file, err = io.open(path, "w")
if not file then
atprint("save ndb failed: ", err or "Unknown Error")
else
for y, ny in pairs(ndb_nodes) do
for x, nx in pairs(ny) do
for z, cid in pairs(nx) do
file:write(int_to_bytes(z))
file:write(int_to_bytes(y))
file:write(int_to_bytes(x))
file:write(int_to_bytes(cid))
end
end
end
file:close()
end
return {nodeids = ndb_nodeids}
end
--function to get node. track database is not helpful here.
function ndb.get_node_or_nil(pos)
local node=minetest.get_node_or_nil(pos)
if node then
return node
else
--maybe we have the node in the database...
local cid=ndbget(pos.x, pos.y, pos.z)
if cid then
local nodeid = ndb_nodeids[u14b(cid)]
if nodeid then
--atprint("ndb.get_node_or_nil",pos,"found node",nodeid,"cid",cid,"par2",l2b(cid))
return {name=nodeid, param2 = l2b(cid)}
end
end
end
atprint("ndb.get_node_or_nil",pos,"not found")
end
function ndb.get_node(pos)
local n=ndb.get_node_or_nil(pos)
if not n then
return {name="ignore", param2=0}
end
return n
end
function ndb.swap_node(pos, node)
minetest.swap_node(pos, node)
ndb.update(pos, node)
end
function ndb.update(pos, pnode)
local node = pnode or minetest.get_node_or_nil(pos)
if not node or node.name=="ignore" then return end
if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].groups.save_in_nodedb then
local nid
for tnid, nname in pairs(ndb_nodeids) do
if nname==node.name then
nid=tnid
end
end
if not nid then
nid=#ndb_nodeids+1
ndb_nodeids[nid]=node.name
end
ndbset(pos.x, pos.y, pos.z, (nid * 4) + (l2b(node.param2 or 0)) )
--atprint("nodedb: updating node", pos, "stored nid",nid,"assigned",ndb_nodeids[nid],"resulting cid",ndb_nodes[hash])
else
--at this position there is no longer a node that needs to be tracked.
ndbset(pos.x, pos.y, pos.z, nil)
end
end
function ndb.clear(pos)
ndbset(pos.x, pos.y, pos.z, nil)
end
--get_node with pseudoload. now we only need track data, so we can use the trackdb as second fallback
--nothing new will be saved inside the trackdb.
--returns:
--true, conn1, conn2, rely1, rely2, railheight in case everything's right.
--false if it's not a rail or the train does not drive on this rail, but it is loaded or
--nil if the node is neither loaded nor in trackdb
--the distraction between false and nil will be needed only in special cases.(train initpos)
function advtrains.get_rail_info_at(pos, drives_on)
local rdp=advtrains.round_vector_floor_y(pos)
local node=ndb.get_node_or_nil(rdp)
--still no node?
--advtrains.trackdb is nil when there's no data available.
if not node then
if advtrains.trackdb then
--try raildb (see trackdb_legacy.lua)
local dbe=(advtrains.trackdb[rdp.y] and advtrains.trackdb[rdp.y][rdp.x] and advtrains.trackdb[rdp.y][rdp.x][rdp.z])
if dbe then
for tt,_ in pairs(drives_on) do
if not dbe.tracktype or tt==dbe.tracktype then
return true, dbe.conn1, dbe.conn2, dbe.rely1 or 0, dbe.rely2 or 0, dbe.railheight or 0
end
end
end
end
return nil
end
local nodename=node.name
if(not advtrains.is_track_and_drives_on(nodename, drives_on)) then
return false
end
local conn1, conn2, rely1, rely2, railheight, tracktype=advtrains.get_track_connections(node.name, node.param2)
return true, conn1, conn2, rely1, rely2, railheight
end
minetest.register_abm({
name = "advtrains:nodedb_on_load_update",
nodenames = {"group:save_in_nodedb"},
run_at_every_load = true,
action = function(pos, node)
local cid=ndbget(pos.x, pos.y, pos.z)
if cid then
--if in database, detect changes and apply.
local nodeid = ndb_nodeids[u14b(cid)]
local param2 = l2b(cid)
if not nodeid then
--something went wrong
atprint("nodedb: lbm nid not found", pos, "with nid", u14b(cid), "param2", param2, "cid is", cid)
ndb.update(pos, node)
else
if (nodeid~=node.name or param2~=node.param2) then
atprint("nodedb: lbm replaced", pos, "with nodeid", nodeid, "param2", param2, "cid is", cid)
minetest.swap_node(pos, {name=nodeid, param2 = param2})
local ndef=minetest.registered_nodes[nodeid]
if ndef and ndef.on_updated_from_nodedb then
ndef.on_updated_from_nodedb(pos, node)
end
end
end
else
--if not in database, take it.
atprint("nodedb: ", pos, "not in database")
ndb.update(pos, node)
end
end,
interval=10,
chance=1,
})
minetest.register_on_dignode(function(pos, oldnode, digger)
ndb.clear(pos)
end)
function ndb.get_nodes()
return ndb_nodes
end
function ndb.get_nodeids()
return ndb_nodeids
end
advtrains.ndb=ndb
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