tools/migration/*.lua: Convert to unix line endings
authorMatthew Wild <mwild1@gmail.com>
Wed, 23 Feb 2011 18:31:48 +0000 (18:31 +0000)
committerMatthew Wild <mwild1@gmail.com>
Wed, 23 Feb 2011 18:31:48 +0000 (18:31 +0000)
tools/migration/config.lua
tools/migration/main.lua
tools/migration/mtools.lua
tools/migration/prosody_files.lua
tools/migration/prosody_sql.lua

index 199b8207fe37af1e53d7b6c06a1cfa27df4351c5..3f2057f03a93a5a07052f1e1fe02c2bbd25347a1 100644 (file)
@@ -1,26 +1,26 @@
-input {\r
-       type = "prosody_sql";\r
-       driver = "SQLite3";\r
-       database = "out.sqlite";\r
-}\r
-output {\r
-       type = "prosody_files";\r
-       path = "out";\r
-}\r
-\r
---[[\r
-\r
-input {\r
-       path = "../../data";\r
-       type = "prosody_files";\r
-       driver = "SQLite3";\r
-       database = "../../prosody.sqlite";\r
-}\r
-output {\r
-       type = "prosody_sql";\r
-       driver = "SQLite3";\r
-       database = "out.sqlite";\r
-       path = "out";\r
-}\r
-\r
-]]\r
+input {
+       type = "prosody_sql";
+       driver = "SQLite3";
+       database = "out.sqlite";
+}
+output {
+       type = "prosody_files";
+       path = "out";
+}
+
+--[[
+
+input {
+       path = "../../data";
+       type = "prosody_files";
+       driver = "SQLite3";
+       database = "../../prosody.sqlite";
+}
+output {
+       type = "prosody_sql";
+       driver = "SQLite3";
+       database = "out.sqlite";
+       path = "out";
+}
+
+]]
index 42e9babe56e646ff33388e8dfd3732f9cc79fcca..a88da21e821ff0949775a5e098220aa7ca4b7072 100644 (file)
@@ -1,27 +1,27 @@
-\r
-\r
-\r
-local function loadfilein(file, env) return loadin and loadin(env, io.open(file):read("*a")) or setfenv(loadfile(file), env); end\r
-config = {};\r
-local config_env = setmetatable({}, { __index = function(t, k) return function(tbl) config[k] = tbl; end; end });\r
-loadfilein("config.lua", config_env)();\r
-\r
-package.path = "../../?.lua;"..package.path\r
-package.cpath = "../../?.dll;"..package.cpath\r
-\r
-\r
-assert(config.input, "no input specified")\r
-assert(config.output, "no output specified")\r
-local itype = assert(config.input.type, "no input.type specified");\r
-local otype = assert(config.output.type, "no output.type specified");\r
-local reader = require(itype).reader(config.input);\r
-local writer = require(otype).writer(config.output);\r
-\r
-local json = require "util.json";\r
-\r
-for x in reader do\r
-       --print(json.encode(x))\r
-       writer(x);\r
-end\r
-writer(nil); -- close\r
-\r
+
+
+
+local function loadfilein(file, env) return loadin and loadin(env, io.open(file):read("*a")) or setfenv(loadfile(file), env); end
+config = {};
+local config_env = setmetatable({}, { __index = function(t, k) return function(tbl) config[k] = tbl; end; end });
+loadfilein("config.lua", config_env)();
+
+package.path = "../../?.lua;"..package.path
+package.cpath = "../../?.dll;"..package.cpath
+
+
+assert(config.input, "no input specified")
+assert(config.output, "no output specified")
+local itype = assert(config.input.type, "no input.type specified");
+local otype = assert(config.output.type, "no output.type specified");
+local reader = require(itype).reader(config.input);
+local writer = require(otype).writer(config.output);
+
+local json = require "util.json";
+
+for x in reader do
+       --print(json.encode(x))
+       writer(x);
+end
+writer(nil); -- close
+
index d2bd1e7a0b501e302fadfa2ad2bb5b4365411892..e7b774bbc82700e21e77009719b7f01e33b571d4 100644 (file)
@@ -1,56 +1,56 @@
-\r
-\r
-local print = print;\r
-local t_insert = table.insert;\r
-local t_sort = table.sort;\r
-\r
-module "mtools"\r
-\r
-function sorted(params)\r
-\r
-       local reader = params.reader; -- iterator to get items from\r
-       local sorter = params.sorter; -- sorting function\r
-       local filter = params.filter; -- filter function\r
-\r
-       local cache = {};\r
-       for item in reader do\r
-               if filter then item = filter(item); end\r
-               if item then t_insert(cache, item); end\r
-       end\r
-       if sorter then\r
-               t_sort(cache, sorter);\r
-       end\r
-       local i = 0;\r
-       return function()\r
-               i = i + 1;\r
-               return cache[i];\r
-       end;\r
-\r
-end\r
-\r
-function merged(reader, merger)\r
-\r
-       local item1 = reader();\r
-       local merged = { item1 };\r
-       return function()\r
-               while true do\r
-                       if not item1 then return nil; end\r
-                       local item2 = reader();\r
-                       if not item2 then item1 = nil; return merged; end\r
-                       if merger(item1, item2) then\r
-                       --print("merged")\r
-                               item1 = item2;\r
-                               t_insert(merged, item1);\r
-                       else\r
-                       --print("unmerged", merged)\r
-                               item1 = item2;\r
-                               local tmp = merged;\r
-                               merged = { item1 };\r
-                               return tmp;\r
-                       end\r
-               end\r
-       end;\r
-\r
-end\r
-\r
-return _M;\r
+
+
+local print = print;
+local t_insert = table.insert;
+local t_sort = table.sort;
+
+module "mtools"
+
+function sorted(params)
+
+       local reader = params.reader; -- iterator to get items from
+       local sorter = params.sorter; -- sorting function
+       local filter = params.filter; -- filter function
+
+       local cache = {};
+       for item in reader do
+               if filter then item = filter(item); end
+               if item then t_insert(cache, item); end
+       end
+       if sorter then
+               t_sort(cache, sorter);
+       end
+       local i = 0;
+       return function()
+               i = i + 1;
+               return cache[i];
+       end;
+
+end
+
+function merged(reader, merger)
+
+       local item1 = reader();
+       local merged = { item1 };
+       return function()
+               while true do
+                       if not item1 then return nil; end
+                       local item2 = reader();
+                       if not item2 then item1 = nil; return merged; end
+                       if merger(item1, item2) then
+                       --print("merged")
+                               item1 = item2;
+                               t_insert(merged, item1);
+                       else
+                       --print("unmerged", merged)
+                               item1 = item2;
+                               local tmp = merged;
+                               merged = { item1 };
+                               return tmp;
+                       end
+               end
+       end;
+
+end
+
+return _M;
index d9c2dd4539d27e28028839e69482fb4f6c60e47b..df67c2409911143689a897d040b01263229b27ad 100644 (file)
-\r
-local print = print;\r
-local assert = assert;\r
-local setmetatable = setmetatable;\r
-local tonumber = tonumber;\r
-local char = string.char;\r
-local coroutine = coroutine;\r
-local lfs = require "lfs";\r
-local loadfile = loadfile;\r
-local setfenv = setfenv;\r
-local pcall = pcall;\r
-local mtools = require "mtools";\r
-local next = next;\r
-local pairs = pairs;\r
-local json = require "util.json";\r
-\r
-prosody = {};\r
-local dm = require "util.datamanager"\r
-\r
-module "prosody_files"\r
-\r
-local function is_dir(path) return lfs.attributes(path, "mode") == "directory"; end\r
-local function is_file(path) return lfs.attributes(path, "mode") == "file"; end\r
-local function clean_path(path)\r
-       return path:gsub("\\", "/"):gsub("//+", "/");\r
-end\r
-local encode, decode; do\r
-       local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });\r
-       decode = function (s) return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes)); end\r
-       encode = function (s) return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end)); end\r
-end\r
-local function decode_dir(x)\r
-       if x:gsub("%%%x%x", ""):gsub("[a-zA-Z0-9]", "") == "" then\r
-               return decode(x);\r
-       end\r
-end\r
-local function decode_file(x)\r
-       if x:match(".%.dat$") and x:gsub("%.dat$", ""):gsub("%%%x%x", ""):gsub("[a-zA-Z0-9]", "") == "" then\r
-               return decode(x:gsub("%.dat$", ""));\r
-       end\r
-end\r
-local function prosody_dir(path, ondir, onfile, ...)\r
-       for x in lfs.dir(path) do\r
-               local xpath = path.."/"..x;\r
-               if decode_dir(x) and is_dir(xpath) then\r
-                       ondir(xpath, x, ...);\r
-               elseif decode_file(x) and is_file(xpath) then\r
-                       onfile(xpath, x, ...);\r
-               end\r
-       end\r
-end\r
-\r
-local function handle_root_file(path, name)\r
-       --print("root file: ", decode_file(name))\r
-       coroutine.yield { user = nil, host = nil, store = decode_file(name) };\r
-end\r
-local function handle_host_file(path, name, host)\r
-       --print("host file: ", decode_dir(host).."/"..decode_file(name))\r
-       coroutine.yield { user = nil, host = decode_dir(host), store = decode_file(name) };\r
-end\r
-local function handle_store_file(path, name, store, host)\r
-       --print("store file: ", decode_file(name).."@"..decode_dir(host).."/"..decode_dir(store))\r
-       coroutine.yield { user = decode_file(name), host = decode_dir(host), store = decode_dir(store) };\r
-end\r
-local function handle_host_store(path, name, host)\r
-       prosody_dir(path, function() end, handle_store_file, name, host);\r
-end\r
-local function handle_host_dir(path, name)\r
-       prosody_dir(path, handle_host_store, handle_host_file, name);\r
-end\r
-local function handle_root_dir(path)\r
-       prosody_dir(path, handle_host_dir, handle_root_file);\r
-end\r
-\r
-local function decode_user(item)\r
-       local userdata = {\r
-               user = item[1].user;\r
-               host = item[1].host;\r
-               stores = {};\r
-       };\r
-       for i=1,#item do -- loop over stores\r
-               local result = {};\r
-               local store = item[i];\r
-               userdata.stores[store.store] = store.data;\r
-               store.user = nil; store.host = nil; store.store = nil;\r
-       end\r
-       return userdata;\r
-end\r
-\r
-function reader(input)\r
-       local path = clean_path(assert(input.path, "no input.path specified"));\r
-       assert(is_dir(path), "input.path is not a directory");\r
-       local iter = coroutine.wrap(function()handle_root_dir(path);end);\r
-       -- get per-user stores, sorted\r
-       local iter = mtools.sorted {\r
-               reader = function()\r
-                       local x = iter();\r
-                       if x then\r
-                               dm.set_data_path(path);\r
-                               x.data = assert(dm.load(x.user, x.host, x.store));\r
-                               return x;\r
-                       end\r
-               end;\r
-               sorter = function(a, b)\r
-                       local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";\r
-                       local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";\r
-                       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);\r
-               end;\r
-       };\r
-       -- merge stores to get users\r
-       iter = mtools.merged(iter, function(a, b)\r
-               return (a.host == b.host and a.user == b.user);\r
-       end);\r
-\r
-       return function()\r
-               local x = iter();\r
-               return x and decode_user(x);\r
-       end\r
-end\r
-\r
-function writer(output)\r
-       local path = clean_path(assert(output.path, "no output.path specified"));\r
-       assert(is_dir(path), "output.path is not a directory");\r
-       return function(item)\r
-               if not item then return; end -- end of input\r
-               dm.set_data_path(path);\r
-               for store, data in pairs(item.stores) do\r
-                       assert(dm.store(item.user, item.host, store, data));\r
-               end\r
-       end\r
-end\r
-\r
-return _M;\r
+
+local print = print;
+local assert = assert;
+local setmetatable = setmetatable;
+local tonumber = tonumber;
+local char = string.char;
+local coroutine = coroutine;
+local lfs = require "lfs";
+local loadfile = loadfile;
+local setfenv = setfenv;
+local pcall = pcall;
+local mtools = require "mtools";
+local next = next;
+local pairs = pairs;
+local json = require "util.json";
+
+prosody = {};
+local dm = require "util.datamanager"
+
+module "prosody_files"
+
+local function is_dir(path) return lfs.attributes(path, "mode") == "directory"; end
+local function is_file(path) return lfs.attributes(path, "mode") == "file"; end
+local function clean_path(path)
+       return path:gsub("\\", "/"):gsub("//+", "/");
+end
+local encode, decode; do
+       local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
+       decode = function (s) return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes)); end
+       encode = function (s) return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end)); end
+end
+local function decode_dir(x)
+       if x:gsub("%%%x%x", ""):gsub("[a-zA-Z0-9]", "") == "" then
+               return decode(x);
+       end
+end
+local function decode_file(x)
+       if x:match(".%.dat$") and x:gsub("%.dat$", ""):gsub("%%%x%x", ""):gsub("[a-zA-Z0-9]", "") == "" then
+               return decode(x:gsub("%.dat$", ""));
+       end
+end
+local function prosody_dir(path, ondir, onfile, ...)
+       for x in lfs.dir(path) do
+               local xpath = path.."/"..x;
+               if decode_dir(x) and is_dir(xpath) then
+                       ondir(xpath, x, ...);
+               elseif decode_file(x) and is_file(xpath) then
+                       onfile(xpath, x, ...);
+               end
+       end
+end
+
+local function handle_root_file(path, name)
+       --print("root file: ", decode_file(name))
+       coroutine.yield { user = nil, host = nil, store = decode_file(name) };
+end
+local function handle_host_file(path, name, host)
+       --print("host file: ", decode_dir(host).."/"..decode_file(name))
+       coroutine.yield { user = nil, host = decode_dir(host), store = decode_file(name) };
+end
+local function handle_store_file(path, name, store, host)
+       --print("store file: ", decode_file(name).."@"..decode_dir(host).."/"..decode_dir(store))
+       coroutine.yield { user = decode_file(name), host = decode_dir(host), store = decode_dir(store) };
+end
+local function handle_host_store(path, name, host)
+       prosody_dir(path, function() end, handle_store_file, name, host);
+end
+local function handle_host_dir(path, name)
+       prosody_dir(path, handle_host_store, handle_host_file, name);
+end
+local function handle_root_dir(path)
+       prosody_dir(path, handle_host_dir, handle_root_file);
+end
+
+local function decode_user(item)
+       local userdata = {
+               user = item[1].user;
+               host = item[1].host;
+               stores = {};
+       };
+       for i=1,#item do -- loop over stores
+               local result = {};
+               local store = item[i];
+               userdata.stores[store.store] = store.data;
+               store.user = nil; store.host = nil; store.store = nil;
+       end
+       return userdata;
+end
+
+function reader(input)
+       local path = clean_path(assert(input.path, "no input.path specified"));
+       assert(is_dir(path), "input.path is not a directory");
+       local iter = coroutine.wrap(function()handle_root_dir(path);end);
+       -- get per-user stores, sorted
+       local iter = mtools.sorted {
+               reader = function()
+                       local x = iter();
+                       if x then
+                               dm.set_data_path(path);
+                               x.data = assert(dm.load(x.user, x.host, x.store));
+                               return x;
+                       end
+               end;
+               sorter = function(a, b)
+                       local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";
+                       local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";
+                       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);
+               end;
+       };
+       -- merge stores to get users
+       iter = mtools.merged(iter, function(a, b)
+               return (a.host == b.host and a.user == b.user);
+       end);
+
+       return function()
+               local x = iter();
+               return x and decode_user(x);
+       end
+end
+
+function writer(output)
+       local path = clean_path(assert(output.path, "no output.path specified"));
+       assert(is_dir(path), "output.path is not a directory");
+       return function(item)
+               if not item then return; end -- end of input
+               dm.set_data_path(path);
+               for store, data in pairs(item.stores) do
+                       assert(dm.store(item.user, item.host, store, data));
+               end
+       end
+end
+
+return _M;
index 56990f4a8b23159fbd682db8ce4cd4ea79b9f4f0..ff33652a599d28e89648ba1d118596f90d602656 100644 (file)
-\r
-local assert = assert;\r
-local DBI = require "DBI";\r
-local print = print;\r
-local type = type;\r
-local next = next;\r
-local pairs = pairs;\r
-local t_sort = table.sort;\r
-local json = require "util.json";\r
-local mtools = require "mtools";\r
-local tostring = tostring;\r
-local tonumber = tonumber;\r
-\r
-module "prosody_sql"\r
-\r
-local function create_table(connection, params)\r
-       local create_sql = "CREATE TABLE `prosody` (`host` TEXT, `user` TEXT, `store` TEXT, `key` TEXT, `type` TEXT, `value` TEXT);";\r
-       if params.driver == "PostgreSQL" then\r
-               create_sql = create_sql:gsub("`", "\"");\r
-       end\r
-       \r
-       local stmt = connection:prepare(create_sql);\r
-       if stmt then\r
-               local ok = stmt:execute();\r
-               local commit_ok = connection:commit();\r
-               if ok and commit_ok then\r
-                       local index_sql = "CREATE INDEX `prosody_index` ON `prosody` (`host`, `user`, `store`, `key`)";\r
-                       if params.driver == "PostgreSQL" then\r
-                               index_sql = index_sql:gsub("`", "\"");\r
-                       elseif params.driver == "MySQL" then\r
-                               index_sql = index_sql:gsub("`([,)])", "`(20)%1");\r
-                       end\r
-                       local stmt, err = connection:prepare(index_sql);\r
-                       local ok, commit_ok, commit_err;\r
-                       if stmt then\r
-                               ok, err = assert(stmt:execute());\r
-                               commit_ok, commit_err = assert(connection:commit());\r
-                       end\r
-               end\r
-       end\r
-end\r
-\r
-local function serialize(value)\r
-       local t = type(value);\r
-       if t == "string" or t == "boolean" or t == "number" then\r
-               return t, tostring(value);\r
-       elseif t == "table" then\r
-               local value,err = json.encode(value);\r
-               if value then return "json", value; end\r
-               return nil, err;\r
-       end\r
-       return nil, "Unhandled value type: "..t;\r
-end\r
-local function deserialize(t, value)\r
-       if t == "string" then return value;\r
-       elseif t == "boolean" then\r
-               if value == "true" then return true;\r
-               elseif value == "false" then return false; end\r
-       elseif t == "number" then return tonumber(value);\r
-       elseif t == "json" then\r
-               return json.decode(value);\r
-       end\r
-end\r
-\r
-local function decode_user(item)\r
-       local userdata = {\r
-               user = item[1][1].user;\r
-               host = item[1][1].host;\r
-               stores = {};\r
-       };\r
-       for i=1,#item do -- loop over stores\r
-               local result = {};\r
-               local store = item[i];\r
-               for i=1,#store do -- loop over store data\r
-                       local row = store[i];\r
-                       local k = row.key;\r
-                       local v = deserialize(row.type, row.value);\r
-                       if k and v then\r
-                               if k ~= "" then result[k] = v; elseif type(v) == "table" then\r
-                                       for a,b in pairs(v) do\r
-                                               result[a] = b;\r
-                                       end\r
-                               end\r
-                       end\r
-                       userdata.stores[store[1].store] = result;\r
-               end\r
-       end\r
-       return userdata;\r
-end\r
-\r
-function reader(input)\r
-       local dbh = assert(DBI.Connect(\r
-               assert(input.driver, "no input.driver specified"),\r
-               assert(input.database, "no input.database specified"),\r
-               input.username, input.password,\r
-               input.host, input.port\r
-       ));\r
-       assert(dbh:ping());\r
-       local stmt = assert(dbh:prepare("SELECT * FROM prosody"));\r
-       assert(stmt:execute());\r
-       local keys = {"host", "user", "store", "key", "type", "value"};\r
-       local f,s,val = stmt:rows(true);\r
-       -- get SQL rows, sorted\r
-       local iter = mtools.sorted {\r
-               reader = function() val = f(s, val); return val; end;\r
-               filter = function(x)\r
-                       for i=1,#keys do\r
-                               if not x[keys[i]] then return false; end -- TODO log error, missing field\r
-                       end\r
-                       if x.host  == "" then x.host  = nil; end\r
-                       if x.user  == "" then x.user  = nil; end\r
-                       if x.store == "" then x.store = nil; end\r
-                       return x;\r
-               end;\r
-               sorter = function(a, b)\r
-                       local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";\r
-                       local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";\r
-                       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);\r
-               end;\r
-       };\r
-       -- merge rows to get stores\r
-       iter = mtools.merged(iter, function(a, b)\r
-               return (a.host == b.host and a.user == b.user and a.store == b.store);\r
-       end);\r
-       -- merge stores to get users\r
-       iter = mtools.merged(iter, function(a, b)\r
-               return (a[1].host == b[1].host and a[1].user == b[1].user);\r
-       end);\r
-       return function()\r
-               local x = iter();\r
-               return x and decode_user(x);\r
-       end;\r
-end\r
-\r
-function writer(output, iter)\r
-       local dbh = assert(DBI.Connect(\r
-               assert(output.driver, "no output.driver specified"),\r
-               assert(output.database, "no output.database specified"),\r
-               output.username, output.password,\r
-               output.host, output.port\r
-       ));\r
-       assert(dbh:ping());\r
-       create_table(dbh, output);\r
-       local stmt = assert(dbh:prepare("SELECT * FROM prosody"));\r
-       assert(stmt:execute());\r
-       local stmt = assert(dbh:prepare("DELETE FROM prosody"));\r
-       assert(stmt:execute());\r
-       local insert = assert(dbh:prepare("INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)"));\r
-\r
-       return function(item)\r
-               if not item then assert(dbh:commit()) return dbh:close(); end -- end of input\r
-               local host = item.host or "";\r
-               local user = item.user or "";\r
-               for store, data in pairs(item.stores) do\r
-                       -- TODO transactions\r
-                       local extradata = {};\r
-                       for key, value in pairs(data) do\r
-                               if type(key) == "string" and key ~= "" then\r
-                                       local t, value = assert(serialize(value));\r
-                                       local ok, err = assert(insert:execute(host, user, store, key, t, value));\r
-                               else\r
-                                       extradata[key] = value;\r
-                               end\r
-                       end\r
-                       if next(extradata) ~= nil then\r
-                               local t, extradata = assert(serialize(extradata));\r
-                               local ok, err = assert(insert:execute(host, user, store, "", t, extradata));\r
-                       end\r
-               end\r
-       end;\r
-end\r
-\r
-\r
-return _M;\r
+
+local assert = assert;
+local DBI = require "DBI";
+local print = print;
+local type = type;
+local next = next;
+local pairs = pairs;
+local t_sort = table.sort;
+local json = require "util.json";
+local mtools = require "mtools";
+local tostring = tostring;
+local tonumber = tonumber;
+
+module "prosody_sql"
+
+local function create_table(connection, params)
+       local create_sql = "CREATE TABLE `prosody` (`host` TEXT, `user` TEXT, `store` TEXT, `key` TEXT, `type` TEXT, `value` TEXT);";
+       if params.driver == "PostgreSQL" then
+               create_sql = create_sql:gsub("`", "\"");
+       end
+       
+       local stmt = connection:prepare(create_sql);
+       if stmt then
+               local ok = stmt:execute();
+               local commit_ok = connection:commit();
+               if ok and commit_ok then
+                       local index_sql = "CREATE INDEX `prosody_index` ON `prosody` (`host`, `user`, `store`, `key`)";
+                       if params.driver == "PostgreSQL" then
+                               index_sql = index_sql:gsub("`", "\"");
+                       elseif params.driver == "MySQL" then
+                               index_sql = index_sql:gsub("`([,)])", "`(20)%1");
+                       end
+                       local stmt, err = connection:prepare(index_sql);
+                       local ok, commit_ok, commit_err;
+                       if stmt then
+                               ok, err = assert(stmt:execute());
+                               commit_ok, commit_err = assert(connection:commit());
+                       end
+               end
+       end
+end
+
+local function serialize(value)
+       local t = type(value);
+       if t == "string" or t == "boolean" or t == "number" then
+               return t, tostring(value);
+       elseif t == "table" then
+               local value,err = json.encode(value);
+               if value then return "json", value; end
+               return nil, err;
+       end
+       return nil, "Unhandled value type: "..t;
+end
+local function deserialize(t, value)
+       if t == "string" then return value;
+       elseif t == "boolean" then
+               if value == "true" then return true;
+               elseif value == "false" then return false; end
+       elseif t == "number" then return tonumber(value);
+       elseif t == "json" then
+               return json.decode(value);
+       end
+end
+
+local function decode_user(item)
+       local userdata = {
+               user = item[1][1].user;
+               host = item[1][1].host;
+               stores = {};
+       };
+       for i=1,#item do -- loop over stores
+               local result = {};
+               local store = item[i];
+               for i=1,#store do -- loop over store data
+                       local row = store[i];
+                       local k = row.key;
+                       local v = deserialize(row.type, row.value);
+                       if k and v then
+                               if k ~= "" then result[k] = v; elseif type(v) == "table" then
+                                       for a,b in pairs(v) do
+                                               result[a] = b;
+                                       end
+                               end
+                       end
+                       userdata.stores[store[1].store] = result;
+               end
+       end
+       return userdata;
+end
+
+function reader(input)
+       local dbh = assert(DBI.Connect(
+               assert(input.driver, "no input.driver specified"),
+               assert(input.database, "no input.database specified"),
+               input.username, input.password,
+               input.host, input.port
+       ));
+       assert(dbh:ping());
+       local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
+       assert(stmt:execute());
+       local keys = {"host", "user", "store", "key", "type", "value"};
+       local f,s,val = stmt:rows(true);
+       -- get SQL rows, sorted
+       local iter = mtools.sorted {
+               reader = function() val = f(s, val); return val; end;
+               filter = function(x)
+                       for i=1,#keys do
+                               if not x[keys[i]] then return false; end -- TODO log error, missing field
+                       end
+                       if x.host  == "" then x.host  = nil; end
+                       if x.user  == "" then x.user  = nil; end
+                       if x.store == "" then x.store = nil; end
+                       return x;
+               end;
+               sorter = function(a, b)
+                       local a_host, a_user, a_store = a.host or "", a.user or "", a.store or "";
+                       local b_host, b_user, b_store = b.host or "", b.user or "", b.store or "";
+                       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);
+               end;
+       };
+       -- merge rows to get stores
+       iter = mtools.merged(iter, function(a, b)
+               return (a.host == b.host and a.user == b.user and a.store == b.store);
+       end);
+       -- merge stores to get users
+       iter = mtools.merged(iter, function(a, b)
+               return (a[1].host == b[1].host and a[1].user == b[1].user);
+       end);
+       return function()
+               local x = iter();
+               return x and decode_user(x);
+       end;
+end
+
+function writer(output, iter)
+       local dbh = assert(DBI.Connect(
+               assert(output.driver, "no output.driver specified"),
+               assert(output.database, "no output.database specified"),
+               output.username, output.password,
+               output.host, output.port
+       ));
+       assert(dbh:ping());
+       create_table(dbh, output);
+       local stmt = assert(dbh:prepare("SELECT * FROM prosody"));
+       assert(stmt:execute());
+       local stmt = assert(dbh:prepare("DELETE FROM prosody"));
+       assert(stmt:execute());
+       local insert = assert(dbh:prepare("INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)"));
+
+       return function(item)
+               if not item then assert(dbh:commit()) return dbh:close(); end -- end of input
+               local host = item.host or "";
+               local user = item.user or "";
+               for store, data in pairs(item.stores) do
+                       -- TODO transactions
+                       local extradata = {};
+                       for key, value in pairs(data) do
+                               if type(key) == "string" and key ~= "" then
+                                       local t, value = assert(serialize(value));
+                                       local ok, err = assert(insert:execute(host, user, store, key, t, value));
+                               else
+                                       extradata[key] = value;
+                               end
+                       end
+                       if next(extradata) ~= nil then
+                               local t, extradata = assert(serialize(extradata));
+                               local ok, err = assert(insert:execute(host, user, store, "", t, extradata));
+                       end
+               end
+       end;
+end
+
+
+return _M;