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Log details if cache received unexpected packet from server

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This commit is contained in:
Johan Wikman 2017-09-15 17:06:35 +03:00
parent fb12e4c0aa
commit d1b742eaa5
1 changed files with 22 additions and 2 deletions
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24
server/modules/filter/cache/cachefiltersession.cc vendored
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@ -515,8 +515,28 @@ int CacheFilterSession::handle_expecting_nothing()
{
ss_dassert(m_state == CACHE_EXPECTING_NOTHING);
ss_dassert(m_res.pData);
MXS_ERROR("Received data from the backend althoug we were expecting nothing.");
ss_dassert(!true);
unsigned long msg_size = gwbuf_length(m_res.pData);
if ((int)MYSQL_GET_COMMAND(GWBUF_DATA(m_res.pData)) == 0xff)
{
/**
* Error text message is after:
* MYSQL_HEADER_LEN offset + status flag (1) + error code (2) +
* 6 bytes message status = MYSQL_HEADER_LEN + 9
*/
MXS_INFO("Error packet received from backend "
"(possibly a server shut down ?): [%.*s].",
(int)msg_size - (MYSQL_HEADER_LEN + 9),
GWBUF_DATA(m_res.pData) + MYSQL_HEADER_LEN + 9);
}
else
{
MXS_WARNING("Received data from the backend although "
"filter is expecting nothing. "
"Packet size is %lu bytes long.",
msg_size);
ss_dassert(!true);
}
return send_upstream();
}