prosody
ce92aafc9c03
tools/migration/migrator/prosody_sql.lua

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tools/migration/migrator/prosody_sql.lua @ 4234:ce92aafc9c03

tools/migration/migrator/prosody_sql: Throw a friendlier error when LuaDBI is not found
author Matthew Wild <mwild1@gmail.com>
date Tue, 05 Apr 2011 12:58:14 +0100
parent 4216:ff80a8471e86
child 4247:6a372135b4c4
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rev   line source
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1
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2 local assert = assert;
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3 local have_DBI, DBI = pcall(require,"DBI");
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4 local print = print;
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5 local type = type;
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6 local next = next;
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7 local pairs = pairs;
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8 local t_sort = table.sort;
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9 local json = require "util.json";
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10 local mtools = require "migrator.mtools";
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11 local tostring = tostring;
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12 local tonumber = tonumber;
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13
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14 if not have_DBI then
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15 error("LuaDBI (required for SQL support) was not found, please see http://prosody.im/doc/depends#luadbi", 0);
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16 end
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17
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18 module "prosody_sql"
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19
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20 local function create_table(connection, params)
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21 local create_sql = "CREATE TABLE `prosody` (`host` TEXT, `user` TEXT, `store` TEXT, `key` TEXT, `type` TEXT, `value` TEXT);";
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22 if params.driver == "PostgreSQL" then
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23 create_sql = create_sql:gsub("`", "\"");
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24 end
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25
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26 local stmt = connection:prepare(create_sql);
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27 if stmt then
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28 local ok = stmt:execute();
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29 local commit_ok = connection:commit();
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30 if ok and commit_ok then
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31 local index_sql = "CREATE INDEX `prosody_index` ON `prosody` (`host`, `user`, `store`, `key`)";
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32 if params.driver == "PostgreSQL" then
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33 index_sql = index_sql:gsub("`", "\"");
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34 elseif params.driver == "MySQL" then
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35 index_sql = index_sql:gsub("`([,)])", "`(20)%1");
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36 end
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37 local stmt, err = connection:prepare(index_sql);
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38 local ok, commit_ok, commit_err;
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39 if stmt then
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40 ok, err = assert(stmt:execute());
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41 commit_ok, commit_err = assert(connection:commit());
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42 end
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43 end
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44 end
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45 end
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46
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47 local function serialize(value)
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48 local t = type(value);
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49 if t == "string" or t == "boolean" or t == "number" then
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50 return t, tostring(value);
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51 elseif t == "table" then
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52 local value,err = json.encode(value);
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53 if value then return "json", value; end
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54 return nil, err;
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55 end
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56 return nil, "Unhandled value type: "..t;
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57 end
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58 local function deserialize(t, value)
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59 if t == "string" then return value;
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60 elseif t == "boolean" then
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61 if value == "true" then return true;
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62 elseif value == "false" then return false; end
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63 elseif t == "number" then return tonumber(value);
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64 elseif t == "json" then
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65 return json.decode(value);
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66 end
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67 end
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68
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69 local function decode_user(item)
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70 local userdata = {
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71 user = item[1][1].user;
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72 host = item[1][1].host;
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73 stores = {};
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74 };
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75 for i=1,#item do -- loop over stores
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76 local result = {};
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77 local store = item[i];
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78 for i=1,#store do -- loop over store data
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79 local row = store[i];
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80 local k = row.key;
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81 local v = deserialize(row.type, row.value);
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82 if k and v then
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83 if k ~= "" then result[k] = v; elseif type(v) == "table" then
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84 for a,b in pairs(v) do
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85 result[a] = b;
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86 end
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87 end
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88 end
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89 userdata.stores[store[1].store] = result;
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90 end
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91 end
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92 return userdata;
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93 end
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94
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95 function reader(input)
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96 local dbh = assert(DBI.Connect(
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97 assert(input.driver, "no input.driver specified"),
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98 assert(input.database, "no input.database specified"),
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99 input.username, input.password,
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100 input.host, input.port
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101 ));
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102 assert(dbh:ping());
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103 local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
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104 assert(stmt:execute());
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105 local keys = {"host", "user", "store", "key", "type", "value"};
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106 local f,s,val = stmt:rows(true);
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107 -- get SQL rows, sorted
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108 local iter = mtools.sorted {
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109 reader = function() val = f(s, val); return val; end;
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110 filter = function(x)
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111 for i=1,#keys do
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112 if not x[keys[i]] then return false; end -- TODO log error, missing field
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113 end
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114 if x.host == "" then x.host = nil; end
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115 if x.user == "" then x.user = nil; end
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116 if x.store == "" then x.store = nil; end
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117 return x;
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118 end;
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119 sorter = function(a, b)
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120 local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";
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121 local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";
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122 return a_host > b_host or (a_host==b_host and a_user > b_user) or (a_host==b_host and a_user==b_user and a_store > b_store);
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123 end;
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124 };
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125 -- merge rows to get stores
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126 iter = mtools.merged(iter, function(a, b)
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127 return (a.host == b.host and a.user == b.user and a.store == b.store);
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128 end);
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129 -- merge stores to get users
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130 iter = mtools.merged(iter, function(a, b)
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131 return (a[1].host == b[1].host and a[1].user == b[1].user);
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132 end);
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133 return function()
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134 local x = iter();
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135 return x and decode_user(x);
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136 end;
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137 end
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138
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139 function writer(output, iter)
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140 local dbh = assert(DBI.Connect(
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141 assert(output.driver, "no output.driver specified"),
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142 assert(output.database, "no output.database specified"),
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143 output.username, output.password,
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144 output.host, output.port
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145 ));
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146 assert(dbh:ping());
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147 create_table(dbh, output);
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148 local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
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149 assert(stmt:execute());
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150 local stmt = assert(dbh:prepare("DELETE FROM prosody"));
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151 assert(stmt:execute());
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152 local insert = assert(dbh:prepare("INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)"));
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153
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154 return function(item)
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155 if not item then assert(dbh:commit()) return dbh:close(); end -- end of input
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156 local host = item.host or "";
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157 local user = item.user or "";
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158 for store, data in pairs(item.stores) do
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159 -- TODO transactions
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160 local extradata = {};
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161 for key, value in pairs(data) do
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162 if type(key) == "string" and key ~= "" then
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163 local t, value = assert(serialize(value));
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164 local ok, err = assert(insert:execute(host, user, store, key, t, value));
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165 else
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166 extradata[key] = value;
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167 end
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168 end
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169 if next(extradata) ~= nil then
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170 local t, extradata = assert(serialize(extradata));
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171 local ok, err = assert(insert:execute(host, user, store, "", t, extradata));
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172 end
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173 end
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174 end;
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175 end
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176
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177
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178 return _M;