Tue, 20 Jul 2010 12:37:28 +0100
util.iterators: Add skip() to skip the first n items of an iterator
local handlers = {}; handlers.accounts = { get = function(self, user) local select = self:query("select password from users where username=?", user); local row = select and select:fetch(); if row then return { password = row[1] }; end end; set = function(self, user, data) if data and data.password then return self:modify("update users set password=? where username=?", data.password, user) or self:modify("insert into users (username, password) values (?, ?)", user, data.password); else return self:modify("delete from users where username=?", user); end end; }; handlers.vcard = { get = function(self, user) local select = self:query("select vcard from vcard where username=?", user); local row = select and select:fetch(); if row then return parse_xml(row[1]); end end; set = function(self, user, data) if data then data = unparse_xml(data); return self:modify("update vcard set vcard=? where username=?", data, user) or self:modify("insert into vcard (username, vcard) values (?, ?)", user, data); else return self:modify("delete from vcard where username=?", user); end end; }; handlers.private = { get = function(self, user) local select = self:query("select namespace,data from private_storage where username=?", user); if select then local data = {}; for row in select:rows() do data[row[1]] = parse_xml(row[2]); end return data; end end; set = function(self, user, data) if data then self:modify("delete from private_storage where username=?", user); for namespace,text in pairs(data) do self:modify("insert into private_storage (username, namespace, data) values (?, ?, ?)", user, namespace, unparse_xml(text)); end return true; else return self:modify("delete from private_storage where username=?", user); end end; -- TODO map_set, map_get }; local subscription_map = { N = "none", B = "both", F = "from", T = "to" }; local subscription_map_reverse = { none = "N", both = "B", from = "F", to = "T" }; handlers.roster = { get = function(self, user) local select = self:query("select jid,nick,subscription,ask,server,subscribe,type from rosterusers where username=?", user); if select then local roster = { pending = {} }; for row in select:rows() do local jid,nick,subscription,ask,server,subscribe,typ = unpack(row); local item = { groups = {} }; if nick == "" then nick = nil; end item.nick = nick; item.subscription = subscription_map[subscription]; if ask == "N" then ask = nil; elseif ask == "O" then ask = "subscribe" elseif ask == "I" then roster.pending[jid] = true; ask = nil; elseif ask == "B" then roster.pending[jid] = true; ask = "subscribe"; else module:log("debug", "bad roster_item.ask: %s", ask); ask = nil; end item.ask = ask; roster[jid] = item; end select = self:query("select jid,grp from rostergroups where username=?", user); if select then for row in select:rows() do local jid,grp = unpack(rows); if roster[jid] then roster[jid].groups[grp] = true; end end end select = self:query("select version from roster_version where username=?", user); local row = select and select:fetch(); if row then roster[false] = { version = row[1]; }; end return roster; end end; set = function(self, user, data) if data and next(data) ~= nil then self:modify("delete from rosterusers where username=?", user); self:modify("delete from rostergroups where username=?", user); self:modify("delete from roster_version where username=?", user); local done = {}; local pending = data.pending or {}; for jid,item in pairs(data) do if jid and jid ~= "pending" then local subscription = subscription_map_reverse[item.subscription]; local ask; if pending[jid] then if item.ask then ask = "B"; else ask = "I"; end else if item.ask then ask = "O"; else ask = "N"; end end local r = self:modify("insert into rosterusers (username,jid,nick,subscription,ask,askmessage,server,subscribe) values (?, ?, ?, ?, ?, '', '', '')", user, jid, item.nick or "", subscription, ask); if not r then module:log("debug", "--- :( %s", tostring(r)); end done[jid] = true; for group in pairs(item.groups) do self:modify("insert into rostergroups (username,jid,grp) values (?, ?, ?)", user, jid, group); end end end for jid in pairs(pending) do if not done[jid] then self:modify("insert into rosterusers (username,jid,nick,subscription,ask,askmessage,server,subscribe) values (?, ?, ?, ?, ?. ''. ''. '')", user, jid, "", "N", "I"); end end local version = data[false] and data[false].version; if version then self:modify("insert into roster_version (username,version) values (?, ?)", user, version); end return true; else self:modify("delete from rosterusers where username=?", user); self:modify("delete from rostergroups where username=?", user); self:modify("delete from roster_version where username=?", user); end end; }; ----------------------------- local driver = {}; driver.__index = driver; function driver:prepare(sql) module:log("debug", "query: %s", sql); local err; if not self.sqlcache then self.sqlcache = {}; end local r = self.sqlcache[sql]; if r then return r; end r, err = self.database:prepare(sql); if not r then error("Unable to prepare SQL statement: "..err); end self.sqlcache[sql] = r; return r; end function driver:query(sql, ...) local stmt = self:prepare(sql); if stmt:execute(...) then return stmt; end end function driver:modify(sql, ...) local stmt = self:query(sql, ...); if stmt and stmt:affected() > 0 then return stmt; end end function driver:open(host, datastore, typ) local cache_key = host.." "..datastore; if self.ds_cache[cache_key] then return self.ds_cache[cache_key]; end local instance = setmetatable({}, self); instance.host = host; instance.datastore = datastore; local handler = handlers[datastore]; if not handler then return nil; end for key,val in pairs(handler) do instance[key] = val; end if instance.init then instance:init(); end self.ds_cache[cache_key] = instance; return instance; end ----------------------------- local _M = {}; function _M.new(dbtype, dbname, ...) local instance = setmetatable({}, driver); instance.__index = instance; instance.database = get_database(dbtype, dbname, ...); instance.ds_cache = {}; return instance; end return _M;