tools/migration/migrator/prosody_sql.lua

   1
   2 local assert = assert;
   3 local have_DBI, DBI = pcall(require,"DBI");
   4 local print = print;
   5 local type = type;
   6 local next = next;
   7 local pairs = pairs;
   8 local t_sort = table.sort;
   9 local json = require "util.json";
  10 local mtools = require "migrator.mtools";
  11 local tostring = tostring;
  12 local tonumber = tonumber;
  13
  14 if not have_DBI then
  15         error("LuaDBI (required for SQL support) was not found, please see http://prosody.im/doc/depends#luadbi", 0);
  16 end
  17
  18 module "prosody_sql"
  19
  20 local function create_table(connection, params)
  21         local create_sql = "CREATE TABLE `prosody` (`host` TEXT, `user` TEXT, `store` TEXT, `key` TEXT, `type` TEXT, `value` TEXT);";
  22         if params.driver == "PostgreSQL" then
  23                 create_sql = create_sql:gsub("`", "\"");
  24         end
  25
  26         local stmt = connection:prepare(create_sql);
  27         if stmt then
  28                 local ok = stmt:execute();
  29                 local commit_ok = connection:commit();
  30                 if ok and commit_ok then
  31                         local index_sql = "CREATE INDEX `prosody_index` ON `prosody` (`host`, `user`, `store`, `key`)";
  32                         if params.driver == "PostgreSQL" then
  33                                 index_sql = index_sql:gsub("`", "\"");
  34                         elseif params.driver == "MySQL" then
  35                                 index_sql = index_sql:gsub("`([,)])", "`(20)%1");
  36                         end
  37                         local stmt, err = connection:prepare(index_sql);
  38                         local ok, commit_ok, commit_err;
  39                         if stmt then
  40                                 ok, err = assert(stmt:execute());
  41                                 commit_ok, commit_err = assert(connection:commit());
  42                         end
  43                 end
  44         end
  45 end
  46
  47 local function serialize(value)
  48         local t = type(value);
  49         if t == "string" or t == "boolean" or t == "number" then
  50                 return t, tostring(value);
  51         elseif t == "table" then
  52                 local value,err = json.encode(value);
  53                 if value then return "json", value; end
  54                 return nil, err;
  55         end
  56         return nil, "Unhandled value type: "..t;
  57 end
  58 local function deserialize(t, value)
  59         if t == "string" then return value;
  60         elseif t == "boolean" then
  61                 if value == "true" then return true;
  62                 elseif value == "false" then return false; end
  63         elseif t == "number" then return tonumber(value);
  64         elseif t == "json" then
  65                 return json.decode(value);
  66         end
  67 end
  68
  69 local function decode_user(item)
  70         local userdata = {
  71                 user = item[1][1].user;
  72                 host = item[1][1].host;
  73                 stores = {};
  74         };
  75         for i=1,#item do -- loop over stores
  76                 local result = {};
  77                 local store = item[i];
  78                 for i=1,#store do -- loop over store data
  79                         local row = store[i];
  80                         local k = row.key;
  81                         local v = deserialize(row.type, row.value);
  82                         if k and v then
  83                                 if k ~= "" then result[k] = v; elseif type(v) == "table" then
  84                                         for a,b in pairs(v) do
  85                                                 result[a] = b;
  86                                         end
  87                                 end
  88                         end
  89                         userdata.stores[store[1].store] = result;
  90                 end
  91         end
  92         return userdata;
  93 end
  94
  95 function reader(input)
  96         local dbh = assert(DBI.Connect(
  97                 assert(input.driver, "no input.driver specified"),
  98                 assert(input.database, "no input.database specified"),
  99                 input.username, input.password,
 100                 input.host, input.port
 101         ));
 102         assert(dbh:ping());
 103         local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
 104         assert(stmt:execute());
 105         local keys = {"host", "user", "store", "key", "type", "value"};
 106         local f,s,val = stmt:rows(true);
 107         -- get SQL rows, sorted
 108         local iter = mtools.sorted {
 109                 reader = function() val = f(s, val); return val; end;
 110                 filter = function(x)
 111                         for i=1,#keys do
 112                                 if not x[keys[i]] then return false; end -- TODO log error, missing field
 113                         end
 114                         if x.host  == "" then x.host  = nil; end
 115                         if x.user  == "" then x.user  = nil; end
 116                         if x.store == "" then x.store = nil; end
 117                         return x;
 118                 end;
 119                 sorter = function(a, b)
 120                         local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";
 121                         local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";
 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);
 123                 end;
 124         };
 125         -- merge rows to get stores
 126         iter = mtools.merged(iter, function(a, b)
 127                 return (a.host == b.host and a.user == b.user and a.store == b.store);
 128         end);
 129         -- merge stores to get users
 130         iter = mtools.merged(iter, function(a, b)
 131                 return (a[1].host == b[1].host and a[1].user == b[1].user);
 132         end);
 133         return function()
 134                 local x = iter();
 135                 return x and decode_user(x);
 136         end;
 137 end
 138
 139 function writer(output, iter)
 140         local dbh = assert(DBI.Connect(
 141                 assert(output.driver, "no output.driver specified"),
 142                 assert(output.database, "no output.database specified"),
 143                 output.username, output.password,
 144                 output.host, output.port
 145         ));
 146         assert(dbh:ping());
 147         create_table(dbh, output);
 148         local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
 149         assert(stmt:execute());
 150         local stmt = assert(dbh:prepare("DELETE FROM prosody"));
 151         assert(stmt:execute());
 152         local insert_sql = "INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)";
 153         if output.driver == "PostgreSQL" then
 154                 insert_sql = insert_sql:gsub("`", "\"");
 155         end
 156         local insert = assert(dbh:prepare(insert_sql));
 157
 158         return function(item)
 159                 if not item then assert(dbh:commit()) return dbh:close(); end -- end of input
 160                 local host = item.host or "";
 161                 local user = item.user or "";
 162                 for store, data in pairs(item.stores) do
 163                         -- TODO transactions
 164                         local extradata = {};
 165                         for key, value in pairs(data) do
 166                                 if type(key) == "string" and key ~= "" then
 167                                         local t, value = assert(serialize(value));
 168                                         local ok, err = assert(insert:execute(host, user, store, key, t, value));
 169                                 else
 170                                         extradata[key] = value;
 171                                 end
 172                         end
 173                         if next(extradata) ~= nil then
 174                                 local t, extradata = assert(serialize(extradata));
 175                                 local ok, err = assert(insert:execute(host, user, store, "", t, extradata));
 176                         end
 177                 end
 178         end;
 179 end
 180
 181
 182 return _M;