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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
$%ENDLICENSE%$ --]]
--[[
--]]
local function str2hex(str)
local raw_len = string.len(str)
local i = 1
local o = ""
while i <= raw_len do
o = o .. string.format(" %02x", string.byte(str, i))
i = i + 1
end
return o
end
--
-- map the constants to strings
-- lua starts at 1
local command_names = {
"COM_SLEEP",
"COM_QUIT",
"COM_INIT_DB",
"COM_QUERY",
"COM_FIELD_LIST",
"COM_CREATE_DB",
"COM_DROP_DB",
"COM_REFRESH",
"COM_SHUTDOWN",
"COM_STATISTICS",
"COM_PROCESS_INFO",
"COM_CONNECT",
"COM_PROCESS_KILL",
"COM_DEBUG",
"COM_PING",
"COM_TIME",
"COM_DELAYED_INSERT",
"COM_CHANGE_USER",
"COM_BINLOG_DUMP",
"COM_TABLE_DUMP",
"COM_CONNECT_OUT",
"COM_REGISTER_SLAVE",
"COM_STMT_PREPARE",
"COM_STMT_EXECUTE",
"COM_STMT_SEND_LONG_DATA",
"COM_STMT_CLOSE",
"COM_STMT_RESET",
"COM_SET_OPTION",
"COM_STMT_FETCH",
"COM_DAEMON"
}
--- dump the result-set to stdout
--
-- @param inj "packet.injection"
local function dump_query_result( inj )
local field_count = 1
local fields = inj.resultset.fields
while fields[field_count] do
local field = fields[field_count]
print("| | field[" .. field_count .. "] = { type = " ..
field.type .. ", name = " .. field.name .. " }" )
field_count = field_count + 1
end
local row_count = 0
for row in inj.resultset.rows do
local cols = {}
local o
for i = 1, field_count do
if not o then
o = ""
else
o = o .. ", "
end
if not row[i] then
o = o .. "(nul)"
else
o = o .. row[i]
end
end
print("| | row["..row_count.."] = { " .. o .. " }")
row_count = row_count + 1
end
end
local function decode_query_packet( packet )
-- we don't have the packet header in the
packet_len = string.len(packet)
print("| query.len = " .. packet_len)
print("| query.packet =" .. str2hex(packet))
-- print("(decode_query) " .. "| packet-id = " .. "(unknown)")
print("| .--- query")
print("| | command = " .. command_names[string.byte(packet) + 1])
if string.byte(packet) == proxy.COM_QUERY then
-- after the COM_QUERY comes the query
print("| | query = " .. string.format("%q", string.sub(packet, 2)))
elseif string.byte(packet) == proxy.COM_INIT_DB then
print("| | db = " .. string.format("%q", string.sub(packet, 2)))
elseif string.byte(packet) == proxy.COM_STMT_PREPARE then
print("| | query = " .. string.format("%q", string.sub(packet, 2)))
elseif string.byte(packet) == proxy.COM_STMT_EXECUTE then
local stmt_handler_id = string.byte(packet, 2) + (string.byte(packet, 3) * 256) + (string.byte(packet, 4) * 256 * 256) + (string.byte(packet, 5) * 256 * 256 * 256)
local flags = string.byte(packet, 6)
local iteration_count = string.byte(packet, 7) + (string.byte(packet, 8) * 256) + (string.byte(packet, 9) * 256 * 256) + (string.byte(packet, 10) * 256 * 256 * 256)
print("| | stmt-id = " .. stmt_handler_id )
print("| | flags = " .. string.format("%02x", flags) )
print("| | iteration_count = " .. iteration_count )
if packet_len > 10 then
-- if we don't have any place-holders, no for NUL and friends
local nul_bitmap = string.byte(packet, 11)
local new_param = string.byte(packet, 12)
print("| | nul_bitmap = " .. string.format("%02x", nul_bitmap ))
print("| | new_param = " .. new_param )
else
print("| | (no params)")
end
print("| | prepared-query = " .. prepared_queries[stmt_handler_id] )
else
print("| | packet =" .. str2hex(packet))
end
print("| '---")
end
function read_query()
--[[ for i = 1, #proxy.global.backends do
local s = proxy.global.backends[i]
local pool = s.pool -- we don't have a username yet, try to find a connections which is idling
local cur_idle = pool.users[""].cur_idle_connections
print(" [".. i .."].connected_clients = " .. s.connected_clients)
print(" [".. i .."].idling_connections = " .. cur_idle)
print(" [".. i .."].type = " .. s.type)
print(" [".. i .."].state = " .. s.state)
end
--]]
proxy.queries:append(1, string.char(proxy.COM_QUERY) .. "SELECT NOW()", { resultset_is_needed = true } )
if proxy.connection then
print ("inject monitor query into backend # " .. proxy.connection.backend_ndx)
else
print ("inject monitor query")
end
end
function read_query_result ( inj )
local res = assert(inj.resultset)
local packet = assert(inj.query)
decode_query_packet(packet)
print "read query result, dumping"
dump_query_result(inj)
end
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