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--[[ $%BEGINLICENSE%$
Copyright (C) 2008 MySQL AB, 2008 Sun Microsystems, Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$%ENDLICENSE%$ --]]
--[[
Let a random number of transaction rollback
As part of the QA we have to verify that applications handle
rollbacks nicely. To simulate a deadlock we turn client-side COMMITs
into server-side ROLLBACKs and return a ERROR packet to the client
telling it a deadlock happened.
--]]
function read_query(packet)
if packet:byte() ~= proxy.COM_QUERY then return end
-- only care about commits
if packet:sub(2):upper() ~= "COMMIT" then return end
-- let 80% fail
if math.random(10) <= 5 then return end
proxy.queries:append(1, string.char(proxy.COM_QUERY) .. "ROLLBACK", { resultset_is_needed = true })
return proxy.PROXY_SEND_QUERY
end
function read_query_result(inj)
if inj.id ~= 1 then return end
proxy.response = {
type = proxy.MYSQLD_PACKET_ERR,
errmsg = "Lock wait timeout exceeded; try restarting transaction",
errno = 1205,
sqlstate = "HY000"
}
return proxy.PROXY_SEND_RESULT
end
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