308 lines
8.2 KiB
Lua
308 lines
8.2 KiB
Lua
--nodedb.lua
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--database of all nodes that have 'save_in_nodedb' field set to true in node definition
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--serialization format:
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--(2byte z) (2byte y) (2byte x) (2byte contentid)
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--contentid := (14bit nodeid, 2bit param2)
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local function int_to_bytes(i)
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local x=i+32768--clip to positive integers
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local cH = math.floor(x / 256) % 256;
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local cL = math.floor(x ) % 256;
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return(string.char(cH, cL));
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end
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local function bytes_to_int(bytes)
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local t={string.byte(bytes,1,-1)}
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local n =
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t[1] * 256 +
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t[2]
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return n-32768
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end
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local function l2b(x)
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return x%4
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end
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local function u14b(x)
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return math.floor(x/4)
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end
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local ndb={}
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--local variables for performance
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local ndb_nodeids={}
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local ndb_nodes={}
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local function ndbget(x,y,z)
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local ny=ndb_nodes[y]
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if ny then
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local nx=ny[x]
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if nx then
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return nx[z]
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end
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end
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return nil
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end
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local function ndbset(x,y,z,v)
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if not ndb_nodes[y] then
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ndb_nodes[y]={}
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end
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if not ndb_nodes[y][x] then
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ndb_nodes[y][x]={}
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end
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ndb_nodes[y][x][z]=v
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end
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local path=minetest.get_worldpath().."/advtrains_ndb2"
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--load
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--nodeids get loaded by advtrains init.lua and passed here
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function ndb.load_data(data)
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ndb_nodeids = data and data.nodeids or {}
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local file, err = io.open(path, "r")
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if not file then
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atwarn("Couldn't load the node database: ", err or "Unknown Error")
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else
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local cnt=0
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local hst_z=file:read(2)
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local hst_y=file:read(2)
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local hst_x=file:read(2)
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local cid=file:read(2)
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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
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ndbset(bytes_to_int(hst_x), bytes_to_int(hst_y), bytes_to_int(hst_z), bytes_to_int(cid))
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cnt=cnt+1
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hst_z=file:read(2)
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hst_y=file:read(2)
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hst_x=file:read(2)
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cid=file:read(2)
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end
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atlog("nodedb: read", cnt, "nodes.")
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file:close()
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end
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end
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--save
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function ndb.save_data()
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local file, err = io.open(path, "w")
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if not file then
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atwarn("Couldn't save the node database: ", err or "Unknown Error")
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else
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for y, ny in pairs(ndb_nodes) do
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for x, nx in pairs(ny) do
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for z, cid in pairs(nx) do
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file:write(int_to_bytes(z))
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file:write(int_to_bytes(y))
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file:write(int_to_bytes(x))
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file:write(int_to_bytes(cid))
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end
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end
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end
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file:close()
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end
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return {nodeids = ndb_nodeids}
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end
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--function to get node. track database is not helpful here.
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function ndb.get_node_or_nil(pos)
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local node=minetest.get_node_or_nil(pos)
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if node then
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return node
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else
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--maybe we have the node in the database...
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return ndb.get_node_raw(pos)
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end
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atprint("ndb.get_node_or_nil",pos,"not found")
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end
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function ndb.get_node(pos)
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local n=ndb.get_node_or_nil(pos)
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if not n then
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return {name="ignore", param2=0}
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end
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return n
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end
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function ndb.get_node_raw(pos)
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local cid=ndbget(pos.x, pos.y, pos.z)
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if cid then
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local nodeid = ndb_nodeids[u14b(cid)]
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if nodeid then
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return {name=nodeid, param2 = l2b(cid)}
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end
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end
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return nil
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end
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function ndb.swap_node(pos, node)
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minetest.swap_node(pos, node)
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ndb.update(pos, node)
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end
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function ndb.update(pos, pnode)
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local node = pnode or minetest.get_node_or_nil(pos)
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if not node or node.name=="ignore" then return end
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if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].groups.save_in_nodedb then
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local nid
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for tnid, nname in pairs(ndb_nodeids) do
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if nname==node.name then
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nid=tnid
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end
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end
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if not nid then
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nid=#ndb_nodeids+1
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ndb_nodeids[nid]=node.name
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end
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ndbset(pos.x, pos.y, pos.z, (nid * 4) + (l2b(node.param2 or 0)) )
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--atprint("nodedb: updating node", pos, "stored nid",nid,"assigned",ndb_nodeids[nid],"resulting cid",ndb_nodes[hash])
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else
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--at this position there is no longer a node that needs to be tracked.
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ndbset(pos.x, pos.y, pos.z, nil)
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end
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end
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function ndb.clear(pos)
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ndbset(pos.x, pos.y, pos.z, nil)
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end
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--get_node with pseudoload. now we only need track data, so we can use the trackdb as second fallback
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--nothing new will be saved inside the trackdb.
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--returns:
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--true, conn1, conn2, rely1, rely2, railheight in case everything's right.
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--false if it's not a rail or the train does not drive on this rail, but it is loaded or
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--nil if the node is neither loaded nor in trackdb
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--the distraction between false and nil will be needed only in special cases.(train initpos)
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function advtrains.get_rail_info_at(pos, drives_on)
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local rdp=advtrains.round_vector_floor_y(pos)
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local node=ndb.get_node_or_nil(rdp)
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--still no node?
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--advtrains.trackdb is nil when there's no data available.
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if not node then
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if advtrains.trackdb then
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--try raildb (see trackdb_legacy.lua)
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local dbe=(advtrains.trackdb[rdp.y] and advtrains.trackdb[rdp.y][rdp.x] and advtrains.trackdb[rdp.y][rdp.x][rdp.z])
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if dbe then
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for tt,_ in pairs(drives_on) do
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if not dbe.tracktype or tt==dbe.tracktype then
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return true, dbe.conn1, dbe.conn2, dbe.rely1 or 0, dbe.rely2 or 0, dbe.railheight or 0
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end
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end
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end
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end
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return nil
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end
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local nodename=node.name
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if(not advtrains.is_track_and_drives_on(nodename, drives_on)) then
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return false
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end
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local conn1, conn2, rely1, rely2, railheight, tracktype=advtrains.get_track_connections(node.name, node.param2)
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return true, conn1, conn2, rely1, rely2, railheight
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end
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ndb.run_lbm = function(pos, node)
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return advtrains.pcall(function()
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local cid=ndbget(pos.x, pos.y, pos.z)
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if cid then
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--if in database, detect changes and apply.
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local nodeid = ndb_nodeids[u14b(cid)]
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local param2 = l2b(cid)
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if not nodeid then
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--something went wrong
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atwarn("Node Database corruption, couldn't determine node to set at", pos)
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ndb.update(pos, node)
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else
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if (nodeid~=node.name or param2~=node.param2) then
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atprint("nodedb: lbm replaced", pos, "with nodeid", nodeid, "param2", param2, "cid is", cid)
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minetest.swap_node(pos, {name=nodeid, param2 = param2})
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local ndef=minetest.registered_nodes[nodeid]
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if ndef and ndef.on_updated_from_nodedb then
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ndef.on_updated_from_nodedb(pos, node)
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end
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return true
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end
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end
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else
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--if not in database, take it.
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atlog("Node Database:", pos, "was not found in the database, have you used worldedit?")
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ndb.update(pos, node)
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end
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return false
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end)
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end
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minetest.register_lbm({
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name = "advtrains:nodedb_on_load_update",
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nodenames = {"group:save_in_nodedb"},
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run_at_every_load = true,
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run_on_every_load = true,
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action = ndb.run_lbm,
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interval=30,
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chance=1,
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})
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--used when restoring stuff after a crash
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ndb.restore_all = function()
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atwarn("Updating the map from the nodedb, this may take a while")
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local cnt=0
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for y, ny in pairs(ndb_nodes) do
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for x, nx in pairs(ny) do
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for z, _ in pairs(nx) do
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local pos={x=x, y=y, z=z}
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local node=minetest.get_node_or_nil(pos)
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if node then
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local ori_ndef=minetest.registered_nodes[node.name]
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local ndbnode=ndb.get_node_raw(pos)
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if ori_ndef and ori_ndef.groups.save_in_nodedb then --check if this node has been worldedited, and don't replace then
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if (ndbnode.name~=node.name or ndbnode.param2~=node.param2) then
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minetest.swap_node(pos, ndbnode)
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atwarn("Replaced",node.name,"@",pos,"with",ndbnode.name)
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end
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else
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ndb.clear(pos)
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atwarn("Found ghost node (former",ndbnode.name,") @",pos,"deleting")
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end
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end
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end
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end
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end
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atwarn("Updated",cnt,"nodes")
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end
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minetest.register_on_dignode(function(pos, oldnode, digger)
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return advtrains.pcall(function()
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ndb.clear(pos)
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end)
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end)
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function ndb.get_nodes()
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return ndb_nodes
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end
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function ndb.get_nodeids()
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return ndb_nodeids
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end
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advtrains.ndb=ndb
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local ptime=0
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minetest.register_chatcommand("at_sync_ndb",
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{
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params = "", -- Short parameter description
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description = "Write node db back to map and find ghost nodes", -- Full description
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privs = {train_operator=true, worldedit=true}, -- Require the "privs" privilege to run
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func = function(name, param)
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return advtrains.pcall(function()
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if not minetest.check_player_privs(name, {server=true}) and os.time() < ptime+30 then
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return false, "Please wait at least 30s from the previous execution of /at_restore_ndb!"
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end
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ndb.restore_all()
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ptime=os.time()
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return true
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end)
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end,
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privs = {train_operator=true}, -- Require the "privs" privilege to run
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})
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