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local assert = assert;
local have_DBI, DBI = pcall(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 "migrator.mtools";
local tostring = tostring;
local tonumber = tonumber;
if not have_DBI then
error("LuaDBI (required for SQL support) was not found, please see http://prosody.im/doc/depends#luadbi", 0);
end
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("`", "\"");
elseif params.driver == "MySQL" then
create_sql = create_sql:gsub("`value` TEXT", "`value` MEDIUMTEXT");
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
else -- COMPAT: Upgrade tables from 0.8.0
-- Failed to create, but check existing MySQL table here
local stmt = connection:prepare("SHOW COLUMNS FROM prosody WHERE Field='value' and Type='text'");
local ok = stmt:execute();
local commit_ok = connection:commit();
if ok and commit_ok then
if stmt:rowcount() > 0 then
local stmt = connection:prepare("ALTER TABLE prosody MODIFY COLUMN `value` MEDIUMTEXT");
local ok = stmt:execute();
local commit_ok = connection:commit();
if ok and commit_ok then
print("Database table automatically upgraded");
end
end
repeat until not stmt:fetch();
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_sql = "INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)";
if output.driver == "PostgreSQL" then
insert_sql = insert_sql:gsub("`", "\"");
end
local insert = assert(dbh:prepare(insert_sql));
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;
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