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util/datamanager.lua @ 417:d60e63379284
Removed commented code
author | Waqas Hussain <waqas20@gmail.com> |
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date | Wed, 26 Nov 2008 01:55:07 +0500 |
parent | 267:6303b7454ad0 |
child | 452:613c5c6bdce4 |
rev | line source |
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0 | 1 local format = string.format; |
2 local setmetatable, type = setmetatable, type; | |
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3 local pairs, ipairs = pairs, ipairs; |
0 | 4 local char = string.char; |
5 local loadfile, setfenv, pcall = loadfile, setfenv, pcall; | |
6 local log = log; | |
7 local io_open = io.open; | |
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8 local os_remove = os.remove; |
267 | 9 local tostring, tonumber = tostring, tonumber; |
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10 local error = error; |
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11 local next = next; |
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12 local t_insert = table.insert; |
0 | 13 |
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14 local indent = function(f, i) |
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15 for n = 1, i do |
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16 f:write("\t"); |
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17 end |
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18 end |
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19 |
0 | 20 module "datamanager" |
21 | |
22 | |
23 ---- utils ----- | |
24 local encode, decode; | |
25 | |
26 local log = function (type, msg) return log(type, "datamanager", msg); end | |
27 | |
28 do | |
29 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end }); | |
30 | |
31 decode = function (s) | |
32 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes)); | |
33 end | |
34 | |
35 encode = function (s) | |
36 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end)); | |
37 end | |
38 end | |
39 | |
40 local function basicSerialize (o) | |
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41 if type(o) == "number" or type(o) == "boolean" then |
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42 return tostring(o); |
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43 else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise. |
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44 return (format("%q", tostring(o)):gsub("\\\n", "\\n")); |
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45 end |
0 | 46 end |
47 | |
48 | |
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49 local function simplesave (f, o, ind) |
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50 if type(o) == "number" then |
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51 f:write(o) |
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52 elseif type(o) == "string" then |
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53 f:write((format("%q", o):gsub("\\\n", "\\n"))) |
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54 elseif type(o) == "table" then |
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55 f:write("{\n") |
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56 for k,v in pairs(o) do |
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57 indent(f, ind); |
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58 f:write("[", basicSerialize(k), "] = ") |
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59 simplesave(f, v, ind+1) |
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60 f:write(",\n") |
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61 end |
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62 indent(f, ind-1); |
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63 f:write("}") |
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64 elseif type(o) == "boolean" then |
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65 f:write(o and "true" or "false"); |
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66 else |
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67 error("cannot serialize a " .. type(o)) |
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68 end |
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69 end |
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70 |
0 | 71 ------- API ------------- |
72 | |
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73 function getpath(username, host, datastore, ext) |
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74 ext = ext or "dat"; |
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75 if username then |
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76 return format("data/%s/%s/%s.%s", encode(host), datastore, encode(username), ext); |
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77 elseif host then |
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78 return format("data/%s/%s.%s", encode(host), datastore, ext); |
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79 else |
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80 return format("data/%s.%s", datastore, ext); |
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81 end |
0 | 82 end |
83 | |
84 function load(username, host, datastore) | |
85 local data, ret = loadfile(getpath(username, host, datastore)); | |
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86 if not data then |
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87 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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88 return nil; |
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89 end |
0 | 90 setfenv(data, {}); |
91 local success, ret = pcall(data); | |
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92 if not success then |
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93 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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94 return nil; |
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95 end |
0 | 96 return ret; |
97 end | |
98 | |
99 function store(username, host, datastore, data) | |
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100 if not data then |
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101 data = {}; |
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102 end |
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103 -- save the datastore |
0 | 104 local f, msg = io_open(getpath(username, host, datastore), "w+"); |
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105 if not f then |
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106 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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107 return; |
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108 end |
0 | 109 f:write("return "); |
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110 simplesave(f, data, 1); |
0 | 111 f:close(); |
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112 if not next(data) then -- try to delete empty datastore |
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113 os_remove(getpath(username, host, datastore)); |
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114 end |
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115 -- we write data even when we are deleting because lua doesn't have a |
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116 -- platform independent way of checking for non-exisitng files |
0 | 117 return true; |
118 end | |
119 | |
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120 function list_append(username, host, datastore, data) |
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121 if not data then return; end |
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122 -- save the datastore |
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123 local f, msg = io_open(getpath(username, host, datastore, "list"), "a+"); |
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124 if not f then |
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125 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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126 return; |
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127 end |
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128 f:write("item("); |
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129 simplesave(f, data, 1); |
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130 f:write(");\n"); |
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131 f:close(); |
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132 return true; |
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133 end |
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134 |
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135 function list_store(username, host, datastore, data) |
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136 if not data then |
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137 data = {}; |
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138 end |
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139 -- save the datastore |
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140 local f, msg = io_open(getpath(username, host, datastore, "list"), "w+"); |
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141 if not f then |
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142 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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143 return; |
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144 end |
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145 for _, d in ipairs(data) do |
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146 f:write("item("); |
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147 simplesave(f, d, 1); |
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148 f:write(");\n"); |
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149 end |
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150 f:close(); |
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151 if not next(data) then -- try to delete empty datastore |
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152 os_remove(getpath(username, host, datastore, "list")); |
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153 end |
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154 -- we write data even when we are deleting because lua doesn't have a |
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155 -- platform independent way of checking for non-exisitng files |
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156 return true; |
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157 end |
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158 |
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159 function list_load(username, host, datastore) |
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160 local data, ret = loadfile(getpath(username, host, datastore, "list")); |
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161 if not data then |
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162 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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163 return nil; |
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164 end |
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165 local items = {}; |
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166 setfenv(data, {item = function(i) t_insert(items, i); end}); |
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167 local success, ret = pcall(data); |
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168 if not success then |
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169 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); |
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170 return nil; |
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171 end |
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172 return items; |
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173 end |
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174 |
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175 return _M; |