mysql-proxy中的admin-lua-script

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[[email protected] lua]# cat admin.lua --[[ $%BEGINLICENSE%$ Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA $%ENDLICENSE%$ --]]function set_error(errmsg)         proxy.response = {                type = proxy.MYSQLD_PACKET_ERR,                errmsg = errmsg or "error"        }endfunction read_query(packet)        if packet:byte() ~= proxy.COM_QUERY then                set_error("[admin] we only handle text-based queries (COM_QUERY)")                return proxy.PROXY_SEND_RESULT        end        local query = packet:sub(2)        local rows = { }        local fields = { }        if query:lower() == "select * from backends" then                fields = {                         { name = "backend_ndx",                           type = proxy.MYSQL_TYPE_LONG },                        { name = "address",                          type = proxy.MYSQL_TYPE_STRING },                        { name = "state",                          type = proxy.MYSQL_TYPE_STRING },                        { name = "type",                          type = proxy.MYSQL_TYPE_STRING },                        { name = "uuid",                          type = proxy.MYSQL_TYPE_STRING },                        { name = "connected_clients",                           type = proxy.MYSQL_TYPE_LONG },                }                for i = 1, #proxy.global.backends do                        local states = {                                "unknown",                                "up",                                "down"                        }                        local types = {                                "unknown",                                "rw",                                "ro"                        }                        local b = proxy.global.backends[i]                        rows[#rows + 1] = {                                i,                                b.dst.name,          -- configured backend address                                states[b.state + 1], -- the C-id is pushed down starting at 0                                types[b.type + 1],   -- the C-id is pushed down starting at 0                                b.uuid,              -- the MySQL Server‘s UUID if it is managed                                b.connected_clients  -- currently connected clients                        }                end        elseif query:lower() == "select * from help" then                fields = {                         { name = "command",                           type = proxy.MYSQL_TYPE_STRING },                        { name = "description",                           type = proxy.MYSQL_TYPE_STRING },                }                rows[#rows + 1] = { "SELECT * FROM help", "shows this help" }                rows[#rows + 1] = { "SELECT * FROM backends", "lists the backends and their state" }        else                set_error("use ‘SELECT * FROM help‘ to see the supported commands")                return proxy.PROXY_SEND_RESULT        end        proxy.response = {                type = proxy.MYSQLD_PACKET_OK,                resultset = {                        fields = fields,                        rows = rows                }        }        return proxy.PROXY_SEND_RESULTend

 

mysql-proxy中的admin-lua-script