prosody
5d685f123332
util/datamanager.lua

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util/datamanager.lua @ 5049:5d685f123332

util.datamanager: Write to a temporary file and atomically move it into place
author Kim Alvefur <zash@zash.se>
date Sun, 29 Jul 2012 03:26:03 +0200
parent 5045:4ba6940deed0
child 5051:71253db26fda
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
758
b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local format = string.format;
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11 local setmetatable, type = setmetatable, type;
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12 local pairs, ipairs = pairs, ipairs;
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13 local char = string.char;
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14 local pcall = pcall;
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15 local log = require "util.logger".init("datamanager");
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16 local io_open = io.open;
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17 local os_remove = os.remove;
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18 local os_rename = os.rename;
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19 local tostring, tonumber = tostring, tonumber;
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20 local error = error;
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21 local next = next;
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22 local t_insert = table.insert;
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23 local t_concat = table.concat;
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24 local envloadfile = require"util.envload".envloadfile;
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25 local serialize = require "util.serialization".serialize;
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26 local path_separator = assert ( package.config:match ( "^([^\n]+)" ) , "package.config not in standard form" ) -- Extract directory seperator from package.config (an undocumented string that comes with lua)
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27 local lfs = require "lfs";
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28 local prosody = prosody;
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29 local raw_mkdir;
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30 local fallocate;
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31
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32 if prosody.platform == "posix" then
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33 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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34 fallocate = require "util.pposix".fallocate;
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35 else
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36 raw_mkdir = lfs.mkdir;
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37 end
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38
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39 if not fallocate then -- Fallback
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40 function fallocate(f, offset, len)
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41 -- This assumes that current position == offset
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42 local fake_data = (" "):rep(len);
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43 local ok, msg = f:write(fake_data);
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44 if not ok then
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45 return ok, msg;
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46 end
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47 f:seek(offset);
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48 return true;
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49 end
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50 end
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51
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52 module "datamanager"
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53
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54 ---- utils -----
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55 local encode, decode;
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56 do
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57 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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58
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59 decode = function (s)
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60 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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61 end
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62
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63 encode = function (s)
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64 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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65 end
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66 end
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67
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68 local _mkdir = {};
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69 local function mkdir(path)
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70 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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71 if not _mkdir[path] then
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72 raw_mkdir(path);
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73 _mkdir[path] = true;
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74 end
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75 return path;
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76 end
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77
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78 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
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79 local callbacks = {};
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80
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81 ------- API -------------
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82
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83 function set_data_path(path)
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84 log("debug", "Setting data path to: %s", path);
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85 data_path = path;
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86 end
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87
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88 local function callback(username, host, datastore, data)
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89 for _, f in ipairs(callbacks) do
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90 username, host, datastore, data = f(username, host, datastore, data);
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91 if username == false then break; end
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92 end
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93
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94 return username, host, datastore, data;
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95 end
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96 function add_callback(func)
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97 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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98 callbacks[func] = true;
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99 callbacks[#callbacks+1] = func;
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100 return true;
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101 end
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102 end
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103 function remove_callback(func)
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104 if callbacks[func] then
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105 for i, f in ipairs(callbacks) do
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106 if f == func then
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107 callbacks[i] = nil;
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108 callbacks[f] = nil;
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109 return true;
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110 end
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111 end
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112 end
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113 end
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114
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115 function getpath(username, host, datastore, ext, create)
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116 ext = ext or "dat";
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117 host = (host and encode(host)) or "_global";
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118 username = username and encode(username);
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119 if username then
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120 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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121 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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122 elseif host then
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123 if create then mkdir(mkdir(data_path).."/"..host); end
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124 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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125 else
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126 if create then mkdir(data_path); end
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127 return format("%s/%s.%s", data_path, datastore, ext);
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128 end
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129 end
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130
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131 function load(username, host, datastore)
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parents: 4452
diff changeset
132 local data, ret = envloadfile(getpath(username, host, datastore), {});
117
8e5c5e6a3240 Fixed: datamanager.store and datamanager.load could crash when username or host arguments were nil. (useful for server specific and global data).
Waqas Hussain <waqas20@gmail.com>
parents: 88
diff changeset
133 if not data then
3086
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Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
134 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
135 if not mode then
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
136 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
3086
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
137 return nil;
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
138 else -- file exists, but can't be read
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
139 -- TODO more detailed error checking and logging?
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
140 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
3086
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
141 return nil, "Error reading storage";
931acb1188b1 util.datamanager: When failing to load a file, and the file exists, return nil, error.
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parents: 2925
diff changeset
142 end
117
8e5c5e6a3240 Fixed: datamanager.store and datamanager.load could crash when username or host arguments were nil. (useful for server specific and global data).
Waqas Hussain <waqas20@gmail.com>
parents: 88
diff changeset
143 end
5021
85b2689dbcfe Eliminate direct setfenv usage
Florian Zeitz <florob@babelmonkeys.de>
parents: 4452
diff changeset
144
0
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parents:
diff changeset
145 local success, ret = pcall(data);
117
8e5c5e6a3240 Fixed: datamanager.store and datamanager.load could crash when username or host arguments were nil. (useful for server specific and global data).
Waqas Hussain <waqas20@gmail.com>
parents: 88
diff changeset
146 if not success then
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
147 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
3086
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Waqas Hussain <waqas20@gmail.com>
parents: 2925
diff changeset
148 return nil, "Error reading storage";
117
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parents: 88
diff changeset
149 end
0
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parents:
diff changeset
150 return ret;
3e3171b59028 First commit, where do you want to go tomorrow?
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diff changeset
151 end
3e3171b59028 First commit, where do you want to go tomorrow?
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parents:
diff changeset
152
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parents: 5045
diff changeset
153 local function atomic_store(filename, data)
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Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
154 local scratch = filename.."~";
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
155 local f, ok, msg;
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
156 repeat
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
157 f, msg = io_open(scratch, "w");
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
158 if not f then break end
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
159
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
160 ok, msg = f:write(data);
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
161 if not ok then break end
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
162
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
163 ok, msg = f:close();
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
164 if not ok then break end
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
165
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parents: 5045
diff changeset
166 return os_rename(scratch, filename);
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parents: 5045
diff changeset
167 until false;
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
168
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
169 -- Cleanup
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
170 if f then f:close(); end
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
171 os_remove(scratch);
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
172 return nil, msg;
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
173 end
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parents: 5045
diff changeset
174
0
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parents:
diff changeset
175 function store(username, host, datastore, data)
206
e30d0e30a0ff Datamanager now deletes files with no data
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parents: 182
diff changeset
176 if not data then
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parents: 182
diff changeset
177 data = {};
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parents: 182
diff changeset
178 end
1381
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parents: 1097
diff changeset
179
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parents: 1097
diff changeset
180 username, host, datastore, data = callback(username, host, datastore, data);
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44780b856ce7 datamanager: Fixed incorrect callback result checking
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parents: 1381
diff changeset
181 if username == false then
1381
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parents: 1097
diff changeset
182 return true; -- Don't save this data at all
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parents: 1097
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183 end
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parents: 1097
diff changeset
184
206
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parents: 182
diff changeset
185 -- save the datastore
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parents: 5045
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186 local d = "return " .. serialize(data) .. ";\n";
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parents: 5045
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187 local ok, msg = atomic_store(getpath(username, host, datastore, nil, true), d);
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parents: 5045
diff changeset
188 if not ok then
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5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
189 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
3108
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parents: 3086
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190 return nil, "Error saving to storage";
117
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Waqas Hussain <waqas20@gmail.com>
parents: 88
diff changeset
191 end
915
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Matthew Wild <mwild1@gmail.com>
parents: 896
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192 if next(data) == nil then -- try to delete empty datastore
1732
f1282fad2f99 datamanager: Fixed logging errors on deletion of datastores not owned by a user@host
Waqas Hussain <waqas20@gmail.com>
parents: 1523
diff changeset
193 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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parents: 182
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194 os_remove(getpath(username, host, datastore));
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parents: 182
diff changeset
195 end
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parents: 182
diff changeset
196 -- we write data even when we are deleting because lua doesn't have a
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parents: 182
diff changeset
197 -- platform independent way of checking for non-exisitng files
0
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198 return true;
3e3171b59028 First commit, where do you want to go tomorrow?
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parents:
diff changeset
199 end
3e3171b59028 First commit, where do you want to go tomorrow?
matthew
parents:
diff changeset
200
247
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
201 function list_append(username, host, datastore, data)
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
202 if not data then return; end
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Waqas Hussain <waqas20@gmail.com>
parents: 1381
diff changeset
203 if callback(username, host, datastore) == false then return true; end
247
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parents: 206
diff changeset
204 -- save the datastore
5045
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parents: 5038
diff changeset
205 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a");
247
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parents: 206
diff changeset
206 if not f then
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
207 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
247
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parents: 206
diff changeset
208 return;
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parents: 206
diff changeset
209 end
5045
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parents: 5038
diff changeset
210 local data = "item(" .. serialize(data) .. ");\n";
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parents: 5038
diff changeset
211 local pos = f:seek("end");
4ba6940deed0 util.datamanager: Use pposix.fallocate() to make sure appends succeed. Also add a fallback fallocate()
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parents: 5038
diff changeset
212 local ok, msg = fallocate(f, pos, #data);
4ba6940deed0 util.datamanager: Use pposix.fallocate() to make sure appends succeed. Also add a fallback fallocate()
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parents: 5038
diff changeset
213 f:seek("set", pos);
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parents: 5038
diff changeset
214 if ok then
4ba6940deed0 util.datamanager: Use pposix.fallocate() to make sure appends succeed. Also add a fallback fallocate()
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parents: 5038
diff changeset
215 f:write(data);
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parents: 5038
diff changeset
216 else
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parents: 5038
diff changeset
217 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
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parents: 5038
diff changeset
218 return ok, msg;
4ba6940deed0 util.datamanager: Use pposix.fallocate() to make sure appends succeed. Also add a fallback fallocate()
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parents: 5038
diff changeset
219 end
247
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parents: 206
diff changeset
220 f:close();
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
221 return true;
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
222 end
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
223
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
224 function list_store(username, host, datastore, data)
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
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parents: 206
diff changeset
225 if not data then
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
226 data = {};
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
227 end
1462
44780b856ce7 datamanager: Fixed incorrect callback result checking
Waqas Hussain <waqas20@gmail.com>
parents: 1381
diff changeset
228 if callback(username, host, datastore) == false then return true; end
247
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
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parents: 206
diff changeset
229 -- save the datastore
5049
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Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
230 local d = {};
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
231 for _, item in ipairs(data) do
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parents: 5045
diff changeset
232 d[#d+1] = "item(" .. serialize(item) .. ");\n";
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
233 end
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
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parents: 5045
diff changeset
234 local ok, msg = atomic_store(getpath(username, host, datastore, "list", true), t_concat(d));
5d685f123332 util.datamanager: Write to a temporary file and atomically move it into place
Kim Alvefur <zash@zash.se>
parents: 5045
diff changeset
235 if not ok then
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
236 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
247
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parents: 206
diff changeset
237 return;
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
238 end
915
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Matthew Wild <mwild1@gmail.com>
parents: 896
diff changeset
239 if next(data) == nil then -- try to delete empty datastore
1732
f1282fad2f99 datamanager: Fixed logging errors on deletion of datastores not owned by a user@host
Waqas Hussain <waqas20@gmail.com>
parents: 1523
diff changeset
240 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
241 os_remove(getpath(username, host, datastore, "list"));
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
242 end
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
243 -- we write data even when we are deleting because lua doesn't have a
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
244 -- platform independent way of checking for non-exisitng files
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
245 return true;
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
246 end
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
247
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parents: 206
diff changeset
248 function list_load(username, host, datastore)
5021
85b2689dbcfe Eliminate direct setfenv usage
Florian Zeitz <florob@babelmonkeys.de>
parents: 4452
diff changeset
249 local items = {};
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250 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
247
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251 if not data then
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252 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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253 if not mode then
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254 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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255 return nil;
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256 else -- file exists, but can't be read
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257 -- TODO more detailed error checking and logging?
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258 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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259 return nil, "Error reading storage";
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260 end
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261 end
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262
247
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263 local success, ret = pcall(data);
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264 if not success then
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Matthew Wild <mwild1@gmail.com>
parents: 4452
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265 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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266 return nil, "Error reading storage";
247
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267 end
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268 return items;
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269 end
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diff changeset
270
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parents: 5024
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271 function list_stores(username, host)
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272 if not host then
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273 return nil, "bad argument #2 to 'list_stores' (string expected, got nothing)";
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274 end
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275 local list = {};
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276 local host_dir = format("%s/%s/", data_path, encode(host));
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277 for node in lfs.dir(host_dir) do
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parents: 5024
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278 if not node:match"^%." then -- dots should be encoded, this is probably . or ..
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279 local store = decode(node);
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280 local path = host_dir..node;
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281 if username == true then
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282 if lfs.attributes(path, "mode") == "directory" then
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283 list[#list+1] = store;
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284 end
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285 elseif username then
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286 if lfs.attributes(getpath(username, host, store), "mode")
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diff changeset
287 or lfs.attributes(getpath(username, host, store, "list"), "mode") then
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diff changeset
288 list[#list+1] = store;
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parents: 5024
diff changeset
289 end
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diff changeset
290 elseif lfs.attributes(path, "mode") == "file" then
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diff changeset
291 list[#list+1] = store:gsub("%.[dalist]+$","");
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parents: 5024
diff changeset
292 end
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parents: 5024
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293 end
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parents: 5024
diff changeset
294 end
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diff changeset
295 return list;
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296 end
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parents: 5024
diff changeset
297
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parents: 5032
diff changeset
298 function purge(username, host)
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diff changeset
299 local host_dir = format("%s/%s/", data_path, encode(host));
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diff changeset
300 local deleted = 0;
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parents: 5032
diff changeset
301 for file in lfs.dir(host_dir) do
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parents: 5032
diff changeset
302 if lfs.attributes(host_dir..file, "mode") == "directory" then
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parents: 5032
diff changeset
303 local store = decode(file);
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parents: 5032
diff changeset
304 deleted = deleted + (os_remove(getpath(username, host, store)) and 1 or 0);
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parents: 5032
diff changeset
305 deleted = deleted + (os_remove(getpath(username, host, store, "list")) and 1 or 0);
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parents: 5032
diff changeset
306 -- We this will generate loads of "No such file or directory", but do we care?
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parents: 5032
diff changeset
307 end
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Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
308 end
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parents: 5032
diff changeset
309 return deleted > 0, deleted;
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parents: 5032
diff changeset
310 end
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parents: 5032
diff changeset
311
247
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parents: 206
diff changeset
312 return _M;