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annotate tools/migration/migrator/prosody_sql.lua @ 8063:605fa6bfafd1

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migrator.prosody_sql: Switch to util.sql (#635)
author Kim Alvefur <zash@zash.se>
date Fri, 07 Apr 2017 13:16:12 +0200
parents 4e3067272fae
children ffb36d1ae23b
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1
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2 local assert = assert;
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3 local have_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 local sql = require "util.sql";
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20 local function create_table(engine, name) -- luacheck: ignore 431/engine
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21 local Table, Column, Index = sql.Table, sql.Column, sql.Index;
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23 local ProsodyTable = Table {
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24 name= name or "prosody";
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25 Column { name="host", type="TEXT", nullable=false };
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26 Column { name="user", type="TEXT", nullable=false };
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27 Column { name="store", type="TEXT", nullable=false };
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28 Column { name="key", type="TEXT", nullable=false };
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29 Column { name="type", type="TEXT", nullable=false };
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30 Column { name="value", type="MEDIUMTEXT", nullable=false };
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31 Index { name="prosody_index", "host", "user", "store", "key" };
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32 };
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33 engine:transaction(function()
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34 ProsodyTable:create(engine);
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35 end);
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36
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37 end
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38
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39 local function serialize(value)
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40 local t = type(value);
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41 if t == "string" or t == "boolean" or t == "number" then
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42 return t, tostring(value);
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43 elseif t == "table" then
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44 local value,err = json.encode(value);
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45 if value then return "json", value; end
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46 return nil, err;
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47 end
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48 return nil, "Unhandled value type: "..t;
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49 end
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50 local function deserialize(t, value)
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51 if t == "string" then return value;
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52 elseif t == "boolean" then
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53 if value == "true" then return true;
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54 elseif value == "false" then return false; end
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55 elseif t == "number" then return tonumber(value);
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56 elseif t == "json" then
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57 return json.decode(value);
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58 end
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59 end
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60
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61 local function decode_user(item)
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62 local userdata = {
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63 user = item[1][1].user;
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64 host = item[1][1].host;
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65 stores = {};
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66 };
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67 for i=1,#item do -- loop over stores
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68 local result = {};
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69 local store = item[i];
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70 for i=1,#store do -- loop over store data
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71 local row = store[i];
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72 local k = row.key;
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73 local v = deserialize(row.type, row.value);
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74 if k and v then
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75 if k ~= "" then result[k] = v; elseif type(v) == "table" then
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76 for a,b in pairs(v) do
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77 result[a] = b;
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78 end
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79 end
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80 end
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81 userdata.stores[store[1].store] = result;
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82 end
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83 end
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84 return userdata;
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85 end
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86
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87 local function reader(input)
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88 local engine = assert(sql:create_engine(input);
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89 local keys = {"host", "user", "store", "key", "type", "value"};
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90 assert(engine:connect());
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91 local f,s,val = assert(engine:select("SELECT `host`, `user`, `store`, `key`, `type`, `value` FROM `prosody`;"));
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92 -- get SQL rows, sorted
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93 local iter = mtools.sorted {
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94 reader = function() val = f(s, val); return val; end;
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95 filter = function(x)
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96 for i=1,#keys do
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97 x[ keys[i] ] = x[i];
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98 end
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99 if x.host == "" then x.host = nil; end
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100 if x.user == "" then x.user = nil; end
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101 if x.store == "" then x.store = nil; end
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102 return x;
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103 end;
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104 sorter = function(a, b)
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105 local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";
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106 local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";
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107 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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108 end;
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109 };
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110 -- merge rows to get stores
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111 iter = mtools.merged(iter, function(a, b)
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112 return (a.host == b.host and a.user == b.user and a.store == b.store);
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113 end);
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114 -- merge stores to get users
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115 iter = mtools.merged(iter, function(a, b)
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116 return (a[1].host == b[1].host and a[1].user == b[1].user);
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117 end);
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118 return function()
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119 local x = iter();
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120 return x and decode_user(x);
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121 end;
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122 end
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123
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124 local function writer(output, iter)
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125 local engine = assert(sql:create_engine(output, function (engine) -- luacheck: ignore 431/engine
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126 create_table(engine);
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127 end));
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128 assert(engine:connect());
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129 assert(engine:delete("DELETE FROM prosody"));
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130 local insert_sql = "INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)";
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131
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132 return function(item)
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133 if not item then return end -- end of input
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134 local host = item.host or "";
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135 local user = item.user or "";
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136 for store, data in pairs(item.stores) do
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137 -- TODO transactions
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138 local extradata = {};
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139 for key, value in pairs(data) do
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140 if type(key) == "string" and key ~= "" then
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141 local t, value = assert(serialize(value));
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142 local ok, err = assert(engine:insert(insert_sql, host, user, store, key, t, value));
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143 else
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144 extradata[key] = value;
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145 end
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146 end
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147 if next(extradata) ~= nil then
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148 local t, extradata = assert(serialize(extradata));
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149 local ok, err = assert(engine:insert(insert_sql, host, user, store, "", t, extradata));
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150 end
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151 end
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152 end;
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153 end
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154
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155
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156 return {
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157 reader = reader;
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158 writer = writer;
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159 }