From f1e82b7dc175cf4e4a52b559aea8d0969dfd1f6f Mon Sep 17 00:00:00 2001 From: sfan5 Date: Thu, 4 Sep 2014 19:12:27 +0200 Subject: [PATCH] Initial commit --- .gitignore | 2 + LICENSE.txt | 278 ++++++++++++++++++++++++++++ init.lua | 514 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 794 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE.txt create mode 100644 init.lua diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5236e1e --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +*~ + diff --git a/LICENSE.txt b/LICENSE.txt new file mode 100644 index 0000000..b53114e --- /dev/null +++ b/LICENSE.txt @@ -0,0 +1,278 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. diff --git a/init.lua b/init.lua new file mode 100644 index 0000000..a66eaa6 --- /dev/null +++ b/init.lua @@ -0,0 +1,514 @@ +nm = {} +nm.playerdb = {} +nm.inspect_mode = {} +nm.inspect_query = {} +nm.write_cache = {} +nm.write_cache_thresh = 20 +nm.write_cache_timeout = 30 -- seconds + +local function try_load(libname) + local success, lib + success, lib = pcall(require, libname) + if success then + return lib + else + return nil + end +end + +local bit32, bit +bit32 = try_load("bit32") +bit = try_load("bit") + +-- Test whether libraries are usable for our purpose + +local bit32_big = true +if bit32 then + local t = 67 + if bit32.lshift(t + 32768, 32) ~= 141025251164160 then + bit32_big = false -- broken + end +end + +local bit_big = true +if bit then + local t = 67 + if bit.lshift(t + 32768, 32) ~= 141025251164160 then + bit_big = false -- broken + end +end + +local function write_u16(f, n) + local s + if bit32 then + s = string.char(bit32.band(n, 255), bit32.rshift(n, 8)) + elseif bit then + s = string.char(bit.band(n, 255), bit.rshift(n, 8)) + else + s = string.char(n % 256, math.floor(n / (2 ^ 8))) + end + f:write(s) +end + +local function read_u16(f) + local s = f:read(2) + if not s then + return nil + end + local a, b = string.byte(s, 1, 2) + if bit32 then + return a + bit32.lshift(b, 8) + elseif bit then + return a + bit.lshift(b, 8) + else + return a + b * (2 ^ 8) + end +end + +local function write_s16(f, n) + write_u16(f, n + 32768) +end + +local function read_s16(f) + local v = read_u16(f) + if v then + return v - 32768 + else + return nil + end +end + +local function hash_node_pos(x, y, z) + if bit32 and bit32_big then + return (x + 32768) + bit32.lshift(y + 32768, 16) + bit32.lshift(z + 32768, 32) + elseif bit and bit_big then + return (x + 32768) + bit.lshift(y + 32768, 16) + bit.lshift(z + 32768, 32) + else + return (x + 32768) + ((y + 32768) * (2 ^ 16)) + ((z + 32768) * (2 ^ 32)) + end + +end + +local function player_db_load() + local f = io.open(minetest.get_worldpath().."/nm_players.db", "r") + if not f then + nm.player_nid = 0 + return + end + local id = 0 + for ent in f:lines() do + nm.playerdb[ent] = id + id = id + 1 + end + nm.player_nid = id + f:close() +end + +local function player_db_add(name) + local f = io.open(minetest.get_worldpath().."/nm_players.db", "a") + if not f then + minetest.log("error", "[NM] Failed to open player database") + error() + end + f:write(name .. "\n") + f:close() +end + +local function player_db_lookup(name, no_new_entry) + local id = nm.playerdb[name] + if not id and not no_new_entry then + id = nm.player_nid + nm.playerdb[name] = id + nm.player_nid = nm.player_nid + 1 + player_db_add(name) + end + return id +end + +local function player_db_lookup_pid(spid) + local sname + for name, pid in pairs(nm.playerdb) do + if pid == spid then + sname = name + break + end + end + return sname +end + +local function nm_db_index() + nm.overwrite_cache = {} + local f = io.open(minetest.get_worldpath().."/nm.db", "rb") + if not f then + f = io.open(minetest.get_worldpath().."/nm.db", "wb") + f:write("NMDB") -- char[4] magic value + f:write(string.char(1)) -- u8 version + f:close() + nm.info = "Fresh database was created" + return + end + local m = f:read(4) + if m ~= "NMDB" then + error("Wrong magic value '" .. m .. "', expected 'NMDB'") + end + local v = string.byte(f:read(1)) + if v == 1 then + -- ok + else + error("Unsupported version " .. v) + end + local seen = {} + local i = 0 + local x, y, z, ph + local stime = os.time() + local sclock = os.clock() + while true do + x = read_s16(f) -- s16 x + if not x then + break + end + z = read_s16(f) -- s16 z + y = read_s16(f) -- s16 y + f:read(2) -- u16 pid + ph = hash_node_pos(x, y, z) + if seen[ph] ~= nil then + table.insert(nm.overwrite_cache, seen[ph]) + end + seen[ph] = i + i = i + 1 + end + f:close() + seen = nil + local eclock = os.clock() + local etime = os.time() + nm.info = string.format("%ds(%.2fs CPU time), %d(%.2f%% outdated entries), %d total entries", + os.difftime(etime, stime), eclock - sclock, #nm.overwrite_cache, (#nm.overwrite_cache / i) * 100, i) + minetest.log("action", "[NM] Read NM database in " .. nm.info) +end + +local function nm_db_lookup(sx, sy, sz) + local f = io.open(minetest.get_worldpath().."/nm.db", "rb") + if not f then + minetest.log("error", "[NM] Failed to open database") + error() + end + local m = f:read(4) + if m ~= "NMDB" then + error("Wrong magic value '" .. m .. "', expected 'NMDB'") + end + local v = string.byte(f:read(1)) + if v == 1 then + -- ok + else + error("Unsupported version " .. v) + end + local x, y, z + while true do + x = read_s16(f) -- x + if x == nil then + break + end + if x ~= sx then + f:read(6) -- z, y, pid + else + z = read_s16(f) -- z + if z ~= sz then + f:read(4) -- y, pid + else + y = read_s16(f) -- y + if y ~= sy then + f:read(2) -- pid + else + local pid = read_u16(f) + f:close() + return pid + end + end + end + end + f:close() + return nil +end + +local function nm_db_lookup_multiple(poslist) + local res = {} + for i = 1, #poslist do + res[i] = -1 + end + local f = io.open(minetest.get_worldpath().."/nm.db", "rb") + if not f then + minetest.log("error", "[NM] Failed to open database") + error() + end + local m = f:read(4) + if m ~= "NMDB" then + error("Wrong magic value '" .. m .. "', expected 'NMDB'") + end + local v = string.byte(f:read(1)) + if v == 1 then + -- ok + else + error("Unsupported version " .. v) + end + local x, y, z, found + while true do + x = read_s16(f) -- x + if x == nil then + break + end + found = false + for _, spos in ipairs(poslist) do + if x == spos.x then + found = true + end + end + if not found then + f:read(6) -- z, y, pid + else + z = read_s16(f) -- z + found = false + for _, spos in ipairs(poslist) do + if x == spos.x and z == spos.z then + found = true + end + end + if not found then + f:read(4) -- y, pid + else + y = read_s16(f) -- y + found = 0 + for i, spos in ipairs(poslist) do + if x == spos.x and z == spos.z and y == spos.y then + found = i + end + end + if found == 0 then + f:read(2) + else + res[found] = read_u16(f) + end + end + end + end + f:close() + return res +end + +local function nm_db_add(x, y, z, pid, fidx) + local f + if fidx then + f = io.open(minetest.get_worldpath().."/nm.db", "r+b") + else + f = io.open(minetest.get_worldpath().."/nm.db", "ab") + end + if not f then + minetest.log("error", "[NM] Failed to open database") + error() + end + if fidx then + f:seek("set", 4 + 1 + (8 * fidx)) + end + write_s16(f, x) + write_s16(f, z) + write_s16(f, y) + write_u16(f, pid) + f:close() +end + +local function fire_node_modify_raw(name, pos) + local pid = player_db_lookup(name) + if #nm.overwrite_cache > 0 then + local fidx = table.remove(nm.overwrite_cache) + nm_db_add(pos.x, pos.y, pos.z, pid, fidx) + else + nm_db_add(pos.x, pos.y, pos.z, pid) + end +end + +local function clean_write_cache() + if #nm.write_cache <= 0 then return end + for _, e in ipairs(nm.write_cache) do + fire_node_modify_raw(e.name, e.pos) + end + nm.write_cache = {} +end + +local write_cache_timer = 0 +minetest.register_globalstep(function(dtime) + write_cache_timer = write_cache_timer + dtime + if write_cache_timer > nm.write_cache_timeout then + clean_write_cache() + write_cache_timer = 0 + end +end) + +local function fire_node_modify(name, pos) + if nm.write_cache_thresh > 0 then + table.insert(nm.write_cache, {name=name, pos=pos}) + if #nm.write_cache > nm.write_cache_thresh then + clean_write_cache() + end + else + fire_node_modify_raw(name, pos) + end +end + +local function get_node_modify(pos) + clean_write_cache() + local pid = nm_db_lookup(pos.x, pos.y, pos.z) + if pid == nil then + return "" + end + local pname = player_db_lookup_pid(pid) + if pname == nil then + return -1 + end + return pname +end + +local function get_node_modify_multiple(poslist) + clean_write_cache() + local pids = nm_db_lookup_multiple(poslist) + local res = {} + for _, pid in ipairs(pids) do + if pid == -1 then + table.insert(res, "") + else + local pname = player_db_lookup_pid(pid) + if pname == nil then + table.insert(res, -1) + else + table.insert(res, pname) + end + end + end + return res +end + +local function get_node_ret2human(v, pos) + if v == "" then + return "No information available for " .. pos .. "." + elseif v == -1 then + return "Found an entry for " .. pos .. " but no matching player name mapping, the database might be corrupted." + else + return pos .. " was last touched by " .. v .. "." + end +end + +minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack, pointed_thing) + if not placer or not placer:is_player() then + return + end + fire_node_modify(placer:get_player_name(), pos) +end) + +minetest.register_on_dignode(function(pos, oldnode, digger) + if not digger or not digger:is_player() then + return + end + fire_node_modify(digger:get_player_name(), pos) +end) + +minetest.register_chatcommand("nm", { + params = " ", + description = "Check who modified a node last", + privs = {basic_privs=true}, + func = function(name, param) + local x, y, z = param:match('(.-) (.-) (.*)') + x = tonumber(x) + y = tonumber(y) + z = tonumber(z) + if x == nil or y == nil or z == nil then + minetest.chat_send_player(name, "Invalid coordinates.") + return + end + local pname = get_node_modify({x=x, y=y, z=z}) + local ps = minetest.pos_to_string({x=x, y=y, z=z}) + minetest.chat_send_player(name, get_node_ret2human(pname, ps)) + end, +}) + +minetest.register_chatcommand("nm_inspect", { + params = "", + description = "Check who modified a node last (inspection mode)", + privs = {basic_privs=true}, + func = function(name, param) + if nm.inspect_mode[name] then + nm.inspect_mode[name] = false + if #nm.inspect_query[name] == 0 then + minetest.chat_send_player(name, "Inspection mode disabled.") + return + end + minetest.chat_send_player(name, "Inspection mode disabled, executing search.") + local res = get_node_modify_multiple(nm.inspect_query[name]) + for i, pos in ipairs(nm.inspect_query[name]) do + local pname = res[i] + local ps = minetest.pos_to_string(pos) + minetest.chat_send_player(name, get_node_ret2human(pname, ps)) + end + nm.inspect_query[name] = {} + else + nm.inspect_mode[name] = true + nm.inspect_query[name] = {} + minetest.chat_send_player(name, "Inspection mode enabled.") + end + end, +}) + +minetest.register_on_punchnode(function(pos, node, puncher, pointed_thing) + if not puncher:is_player() then return end + local name = puncher:get_player_name() + if nm.inspect_mode[name] then + table.insert(nm.inspect_query[name], pointed_thing.under) + end +end) + +minetest.register_chatcommand("nm_info", { + params = "", + description = "Get information about NM database & configuration", + privs = {basic_privs=true}, + func = function(name, param) + minetest.chat_send_player(name, string.format("Info: Database was read in %s, " + .. "%d outdated entries queued for overwriting, %d unsaved changes", nm.info, #nm.overwrite_cache, #nm.write_cache)) + local cfg = string.format("Write cache size: %d, Write cache timeout: %ds, Libraries -> bit: ", + nm.write_cache_thresh, nm.write_cache_timeout) + if bit then + cfg = cfg .. "available (big numbers: " + if bit_big then + cfg = cfg .. "working" + else + cfg = cfg .. "broken" + end + cfg = cfg .. "), " + else + cfg = cfg .. "unavailable, " + end + cfg = cfg .. "bit32: " + if bit32 then + cfg = cfg .. "available (big numbers: " + if bit32_big then + cfg = cfg .. "working" + else + cfg = cfg .. "broken" + end + cfg = cfg .. ")" + else + cfg = cfg .. "unavailable" + end + minetest.chat_send_player(name, "Config Info: " .. cfg) + end, +}) + +minetest.register_chatcommand("nm_reindex", { + params = "", + description = "Reindex the NM database", + privs = {basic_privs=true}, + func = function(name, param) + clean_write_cache() + nm_db_index() + minetest.chat_send_player(name, "Read database in " .. nm.info) + end, +}) + +player_db_load() +nm_db_index()