aboutsummaryrefslogtreecommitdiffstats
path: root/util/datamanager.lua
blob: 82f840efac0a7afe06e1b230b32632e8dee4b659 (plain)
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
-- Prosody IM v0.3
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local format = string.format;
local setmetatable, type = setmetatable, type;
local pairs, ipairs = pairs, ipairs;
local char = string.char;
local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
local log = require "util.logger".init("datamanager");
local io_open = io.open;
local os_remove = os.remove;
local io_popen = io.popen;
local tostring, tonumber = tostring, tonumber;
local error = error;
local next = next;
local t_insert = table.insert;
local append = require "util.serialization".append;
local path_separator = "/"; if os.getenv("WINDIR") then path_separator = "\\" end

module "datamanager"

---- utils -----
local encode, decode;
do 
	local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });

	decode = function (s)
		return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
	end

	encode = function (s)
		return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
	end
end

local _mkdir = {};
local function mkdir(path)
	path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
	if not _mkdir[path] then
		local x = io_popen("mkdir \""..path.."\" 2>&1"):read("*a");
		_mkdir[path] = true;
	end
	return path;
end

local data_path = "data";

------- API -------------

function set_data_path(path)
	log("info", "Setting data path to: %s", path);
	data_path = path;
end

function getpath(username, host, datastore, ext, create)
	ext = ext or "dat";
	host = host and encode(host);
	username = username and encode(username);
	if username then
		if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
		return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
	elseif host then
		if create then mkdir(mkdir(data_path).."/"..host); end
		return format("%s/%s/%s.%s", data_path, host, datastore, ext);
	else
		if create then mkdir(data_path); end
		return format("%s/%s.%s", data_path, datastore, ext);
	end
end

function load(username, host, datastore)
	local data, ret = loadfile(getpath(username, host, datastore));
	if not data then
		log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return nil;
	end
	setfenv(data, {});
	local success, ret = pcall(data);
	if not success then
		log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return nil;
	end
	return ret;
end

function store(username, host, datastore, data)
	if not data then
		data = {};
	end
	-- save the datastore
	local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
	if not f then
		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return;
	end
	f:write("return ");
	append(f, data);
	f:close();
	if not next(data) then -- try to delete empty datastore
		os_remove(getpath(username, host, datastore));
	end
	-- we write data even when we are deleting because lua doesn't have a
	-- platform independent way of checking for non-exisitng files
	return true;
end

function list_append(username, host, datastore, data)
	if not data then return; end
	-- save the datastore
	local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
	if not f then
		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return;
	end
	f:write("item(");
	append(f, data);
	f:write(");\n");
	f:close();
	return true;
end

function list_store(username, host, datastore, data)
	if not data then
		data = {};
	end
	-- save the datastore
	local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
	if not f then
		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return;
	end
	for _, d in ipairs(data) do
		f:write("item(");
		append(f, d);
		f:write(");\n");
	end
	f:close();
	if not next(data) then -- try to delete empty datastore
		os_remove(getpath(username, host, datastore, "list"));
	end
	-- we write data even when we are deleting because lua doesn't have a
	-- platform independent way of checking for non-exisitng files
	return true;
end

function list_load(username, host, datastore)
	local data, ret = loadfile(getpath(username, host, datastore, "list"));
	if not data then
		log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return nil;
	end
	local items = {};
	setfenv(data, {item = function(i) t_insert(items, i); end});
	local success, ret = pcall(data);
	if not success then
		log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
		return nil;
	end
	return items;
end

return _M;