summaryrefslogtreecommitdiffstats
path: root/MCServer/Plugins/ProtectionAreas/Storage.lua
blob: defa9b39438018c878fb3f767eaecef60dff8f8a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450

-- Storage.lua
-- Implements the storage access object, shielding the rest of the code away from the DB

--[[
The cStorage class is the interface to the underlying storage, the SQLite database.
This class knows how to load player areas from the DB, how to add or remove areas in the DB
and other such operations.

Also, a g_Storage global variable is declared, it holds the single instance of the storage.
--]]





cStorage = {};

g_Storage = {};





--- Initializes the storage subsystem, creates the g_Storage object
-- Returns true if successful, false if not
function InitializeStorage()
	g_Storage = cStorage:new();
	if (not(g_Storage:OpenDB())) then
		return false;
	end
	
	return true;
end





function cStorage:new(obj)
	obj = obj or {};
	setmetatable(obj, self);
	self.__index = self;
	return obj;
end




--- Opens the DB and makes sure it has all the columns needed
-- Returns true if successful, false otherwise
function cStorage:OpenDB()
	local ErrCode, ErrMsg;
	self.DB, ErrCode, ErrMsg = sqlite3.open("ProtectionAreas.sqlite");
	if (self.DB == nil) then
		LOGWARNING(PluginPrefix .. "Cannot open ProtectionAreas.sqlite, error " .. ErrCode .. " (" .. ErrMsg ..")");
		return false;
	end
	
	if (
		not(self:CreateTable("Areas", {"ID INTEGER PRIMARY KEY AUTOINCREMENT", "MinX", "MaxX", "MinZ", "MaxZ", "WorldName", "CreatorUserName"})) or
		not(self:CreateTable("AllowedUsers", {"AreaID", "UserName"}))
	) then
		LOGWARNING(PluginPrefix .. "Cannot create DB tables!");
		return false;
	end
	
	return true;
end





--- Executes the SQL command given, calling the a_Callback for each result
-- If the SQL command fails, prints it out on the server console and returns false
-- Returns true on success
function cStorage:DBExec(a_SQL, a_Callback, a_CallbackParam)
	local ErrCode = self.DB:exec(a_SQL, a_Callback, a_CallbackParam);
	if (ErrCode ~= sqlite3.OK) then
		LOGWARNING(PluginPrefix .. "Error " .. ErrCode .. " (" .. self.DB:errmsg() .. 
			") while processing SQL command >>" .. a_SQL .. "<<"
		);
		return false;
	end
	return true;
end





--- Creates the table of the specified name and columns[]
-- If the table exists, any columns missing are added; existing data is kept
function cStorage:CreateTable(a_TableName, a_Columns)

	local sql = "CREATE TABLE IF NOT EXISTS '" .. a_TableName .. "' (";
	sql = sql .. table.concat(a_Columns, ", ");
	sql = sql .. ")";
	if (not(self:DBExec(sql))) then
		LOGWARNING(PluginPrefix .. "Cannot create DB Table " .. a_TableName);
		return false;
	end
	
	-- Check each column whether it exists
	-- Remove all the existing columns from a_Columns:
	local RemoveExistingColumn = function(UserData, NumCols, Values, Names)
		-- Remove the received column from a_Columns. Search for column name in the Names[] / Values[] pairs
		for i = 1, NumCols do
			if (Names[i] == "name") then
				local ColumnName = Values[i]:lower();
				-- Search the a_Columns if they have that column:
				for j = 1, #a_Columns do
					-- Cut away all column specifiers (after the first space), if any:
					local SpaceIdx = string.find(a_Columns[j], " ");
					if (SpaceIdx ~= nil) then
						SpaceIdx = SpaceIdx - 1;
					end
					local ColumnTemplate = string.lower(string.sub(a_Columns[j], 1, SpaceIdx));
					-- If it is a match, remove from a_Columns:
					if (ColumnTemplate == ColumnName) then
						table.remove(a_Columns, j);
						break;  -- for j
					end
				end  -- for j - a_Columns[]
			end
		end  -- for i - Names[] / Values[]
		return 0;
	end
	if (not(self:DBExec("PRAGMA table_info(" .. a_TableName .. ")", RemoveExistingColumn))) then
		LOGWARNING(PluginPrefix .. "Cannot query DB table structure");
		return false;
	end
	
	-- Create the missing columns
	-- a_Columns now contains only those columns that are missing in the DB
	if (#a_Columns > 0) then
		LOGINFO(PluginPrefix .. "Database table \"" .. a_TableName .. "\" is missing " .. #a_Columns .. " columns, fixing now.");
		for idx, ColumnName in ipairs(a_Columns) do
			if (not(self:DBExec("ALTER TABLE '" .. a_TableName .. "' ADD COLUMN " .. ColumnName))) then
				LOGWARNING(PluginPrefix .. "Cannot add DB table \"" .. a_TableName .. "\" column \"" .. ColumnName .. "\"");
				return false;
			end
		end
		LOGINFO(PluginPrefix .. "Database table \"" .. a_TableName .. "\" columns fixed.");
	end
	
	return true;
end





--- Returns true if the specified area is allowed for the specified player
function cStorage:IsAreaAllowed(a_AreaID, a_PlayerName, a_WorldName)
	local res = false;
	local sql = "SELECT COUNT(*) FROM AllowedUsers WHERE (AreaID = " .. a_AreaID .. 
		") AND (UserName ='" .. a_PlayerName .. "')";
	local function SetResTrue(UserData, NumValues, Values, Names)
		res = (tonumber(Values[1]) > 0);
		return 0;
	end
	if (not(self:DBExec(sql, SetResTrue))) then
		LOGWARNING("SQL error while determining area allowance");
		return false;
	end
	return res;
end





--- Loads cPlayerAreas for the specified player from the DB. Returns a cPlayerAreas object
function cStorage:LoadPlayerAreas(a_PlayerName, a_PlayerX, a_PlayerZ, a_WorldName)
	res = cPlayerAreas:new();

	-- Bounds for which the areas are loaded
	local BoundsMinX = a_PlayerX - g_AreaBounds;
	local BoundsMaxX = a_PlayerX + g_AreaBounds;
	local BoundsMinZ = a_PlayerZ - g_AreaBounds;
	local BoundsMaxZ = a_PlayerZ + g_AreaBounds;

	-- Load the areas from the DB, based on the player's location
	local sql = 
		"SELECT ID, MinX, MaxX, MinZ, MaxZ FROM Areas WHERE " ..
		"MinX < " .. BoundsMaxX .. " AND MaxX > " .. BoundsMinX .. " AND " ..
		"MinZ < " .. BoundsMaxZ .. " AND MaxZ > " .. BoundsMinZ .. " AND " ..
		"WorldName='" .. a_WorldName .."'";
	
	local function AddAreas(UserData, NumValues, Values, Names)
		if ((NumValues < 5) or ((Values[1] and Values[2] and Values[3] and Values[4] and Values[5]) == nil)) then
			LOGWARNING("SQL query didn't return all data");
			return 0;
		end
		res:AddArea(cCuboid(Values[2], 0, Values[4], Values[3], 255, Values[5]), self:IsAreaAllowed(Values[1], a_PlayerName, a_WorldName));
		return 0;
	end
	
	if (not(self:DBExec(sql, AddAreas))) then
		LOGWARNING("SQL error while querying areas");
		return res;
	end
	
	return res;
end





--- Adds a new area into the DB. a_AllowedNames is a table listing all the players that are allowed in the area
-- Returns the ID of the new area, or -1 on failure
function cStorage:AddArea(a_Cuboid, a_WorldName, a_CreatorName, a_AllowedNames)
	-- Store the area in the DB
	local ID = -1;
	local function RememberID(UserData, NumCols, Values, Names)
		for i = 1, NumCols do
			if (Names[i] == "ID") then
				ID = Values[i];
			end
		end
		return 0;
	end
	local sql = 
		"INSERT INTO Areas (ID, MinX, MaxX, MinZ, MaxZ, WorldName, CreatorUserName) VALUES (NULL, " ..
		a_Cuboid.p1.x .. ", " .. a_Cuboid.p2.x .. ", " .. a_Cuboid.p1.z .. ", " .. a_Cuboid.p2.z .. 
		", '"  .. a_WorldName .. "', '" .. a_CreatorName ..
		"'); SELECT last_insert_rowid() AS ID";
	if (not(self:DBExec(sql, RememberID))) then
		LOGWARNING(PluginPrefix .. "SQL Error while inserting new area");
		return -1;
	end
	if (ID == -1) then
		LOGWARNING(PluginPrefix .. "SQL Error while retrieving INSERTion ID");
		return -1;
	end
	
	-- Store each allowed player in the DB
	for idx, Name in ipairs(a_AllowedNames) do
		local sql = "INSERT INTO AllowedUsers (AreaID, UserName) VALUES (" .. ID .. ", '" .. Name .. "')";
		if (not(self:DBExec(sql))) then
			LOGWARNING(PluginPrefix .. "SQL Error while inserting new area's allowed player " .. Name);
		end
	end
	return ID;
end





function cStorage:DelArea(a_WorldName, a_AreaID)
	-- Since all areas are stored in a single DB (for now), the worldname parameter isn't used at all
	-- Later if we change to a per-world DB, we'll need the world name
	
	-- Delete from both tables simultaneously
	local sql = 
		"DELETE FROM Areas          WHERE ID="     .. a_AreaID .. ";" ..
		"DELETE FROM AllowedUsers WHERE AreaID=" .. a_AreaID;
	if (not(self:DBExec(sql))) then
		LOGWARNING(PluginPrefix .. "SQL error while deleting area " .. a_AreaID .. " from world \"" .. a_WorldName .. "\"");
		return false;
	end
	
	return true;
end





--- Removes the user from the specified area
function cStorage:RemoveUser(a_AreaID, a_UserName, a_WorldName)
	-- WorldName is not used yet, because all the worlds share the same DB in this version
	local sql = "DELETE FROM AllowedUsers WHERE " .. 
		"AreaID = " ..  a_AreaID .. " AND UserName = '" .. a_UserName .. "'";
	if (not(self:DBExec(sql))) then	
		LOGWARNING("SQL error while removing user " .. a_UserName .. " from area ID " .. a_AreaID);
		return false;
	end
	return true;
end





--- Removes the user from all areas in the specified world
function cStorage:RemoveUserAll(a_UserName, a_WorldName)
	-- TODO
	LOGWARNING("cStorage:RemoveUserAll(): Not implemented yet!");
end





--- Calls the callback for each area intersecting the specified coords
-- Callback signature: function(ID, MinX, MinZ, MaxX, MaxZ, CreatorName)
function cStorage:ForEachArea(a_BlockX, a_BlockZ, a_WorldName, a_Callback)

	-- SQL callback that parses the values and calls our callback
	function CallCallback(UserData, NumValues, Values, Names)
		if (NumValues ~= 6) then
			-- Not enough values returned, skip this row
			return 0;
		end
		local ID          = Values[1];
		local MinX        = Values[2];
		local MinZ        = Values[3];
		local MaxX        = Values[4];
		local MaxZ        = Values[5];
		local CreatorName = Values[6];
		a_Callback(ID, MinX, MinZ, MaxX, MaxZ, CreatorName);
		return 0;
	end
	
	local sql = "SELECT ID, MinX, MinZ, MaxX, MaxZ, CreatorUserName FROM Areas WHERE " ..
		"MinX <= " .. a_BlockX .. " AND MaxX >= " .. a_BlockX .. " AND " ..
		"MinZ <= " .. a_BlockZ .. " AND MaxZ >= " .. a_BlockZ .. " AND " ..
		"WorldName = '" .. a_WorldName .. "'";
	if (not(self:DBExec(sql, CallCallback))) then
		LOGWARNING("SQL Error while iterating through areas (cStorage:ForEachArea())");
		return false;
	end
	return true;
end





--- Returns the info on the specified area
-- Returns MinX, MinZ, MaxX, MaxZ, CreatorName on success, or nothing on failure
function cStorage:GetArea(a_AreaID, a_WorldName)

	local MinX, MinZ, MaxX, MaxZ, CreatorName;
	local HasValues = false;
	
	-- SQL callback that parses the values and remembers them in variables
	function RememberValues(UserData, NumValues, Values, Names)
		if (NumValues ~= 5) then
			-- Not enough values returned, skip this row
			return 0;
		end
		MinX        = Values[1];
		MinZ        = Values[2];
		MaxX        = Values[3];
		MaxZ        = Values[4];
		CreatorName = Values[5];
		HasValues = true;
		return 0;
	end
	
	local sql = "SELECT MinX, MinZ, MaxX, MaxZ, CreatorUserName FROM Areas WHERE " ..
		"ID = " .. a_AreaID .. " AND WorldName = '" .. a_WorldName .. "'";
	if (not(self:DBExec(sql, RememberValues))) then
		LOGWARNING("SQL Error while getting area info (cStorage:ForEachArea())");
		return;
	end
	
	-- If no data has been retrieved, return nothing
	if (not(HasValues)) then
		return;
	end
	
	return MinX, MinZ, MaxX, MaxZ, CreatorName;
end





--- Calls the callback for each allowed user for the specified area
-- Callback signature: function(UserName)
function cStorage:ForEachUserInArea(a_AreaID, a_WorldName, a_Callback)
	assert(a_AreaID);
	assert(a_WorldName);
	assert(a_Callback);
	assert(self);
	
	-- Since in this version all the worlds share a single DB, the a_WorldName parameter is not actually used
	-- But this may change in the future, when we have a per-world DB
	
	local function CallCallback(UserData, NumValues, Values)
		if (NumValues ~= 1) then
			return 0;
		end
		a_Callback(Values[1]);
		return 0;
	end
	local sql = "SELECT UserName FROM AllowedUsers WHERE AreaID = " .. a_AreaID;
	if (not(self:DBExec(sql, CallCallback))) then
		LOGWARNING("SQL error while iterating area users for AreaID" .. a_AreaID);
		return false;
	end
	return true;
end





--- Adds the specified usernames to the specified area, if not already present
-- a_Users is an array table of usernames to add
function cStorage:AddAreaUsers(a_AreaID, a_WorldName, a_AddedBy, a_Users)
	assert(a_AreaID);
	assert(a_WorldName);
	assert(a_Users);
	assert(self);
	
	-- Remove from a_Users the usernames already present in the area
	local sql = "SELECT UserName FROM AllowedUsers WHERE AreaID = " .. a_AreaID;
	local function Remove(UserData, NumValues, Values, Names)
		if (NumValues ~= 1) then
			-- Invalid response format
			return 0;
		end
		local DBName = Values[1];
		-- Remove the name from a_Users, if exists
		for idx, Name in ipairs(a_Users) do
			if (Name == DBName) then
				table.remove(a_Users, idx);
				return 0;
			end
		end
		return 0;
	end
	if (not(self:DBExec(sql, Remove))) then
		LOGWARNING("SQL error while iterating through users");
		return false;
	end
	
	-- Add the users
	for idx, Name in ipairs(a_Users) do
		local sql = "INSERT INTO AllowedUsers (AreaID, UserName) VALUES (" .. a_AreaID .. ", '" .. Name .. "')";
		if (not(self:DBExec(sql))) then
			LOGWARNING("SQL error while adding user " .. Name .. " to area " .. a_AreaID);
		end
	end
	
	return true;
end