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--[[ $%BEGINLICENSE%$
Copyright (C) 2007-2008 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 tokenizer = require("proxy.tokenizer")
local parser = require("proxy.parser")
local commands = require("proxy.commands")
local auto_config = require("proxy.auto-config")
-- init global counters
if not proxy.global.config.histogram then
proxy.global.config.histogram = {
collect_queries = true,
collect_tables = true
}
end
-- init query counters
if not proxy.global.norm_queries then
proxy.global.norm_queries = { }
end
-- init table-usage
if not proxy.global.tables then
proxy.global.tables = { }
end
function read_query(packet)
local cmd = commands.parse(packet)
local r = auto_config.handle(cmd)
if r then return r end
if cmd.type == proxy.COM_QUERY then
local tokens = assert(tokenizer.tokenize(cmd.query))
local norm_query = tokenizer.normalize(tokens)
-- print("normalized query: " .. norm_query)
if norm_query == "SELECT * FROM `histogram` . `queries` " then
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
resultset = {
fields = {
{ type = proxy.MYSQL_TYPE_STRING,
name = "query" },
{ type = proxy.MYSQL_TYPE_LONG,
name = "count" },
{ type = proxy.MYSQL_TYPE_LONG,
name = "max_query_time" },
{ type = proxy.MYSQL_TYPE_FLOAT,
name = "avg_query_time" },
}
}
}
local rows = {}
if proxy.global.norm_queries then
for k, v in pairs(proxy.global.norm_queries) do
rows[#rows + 1] = {
k,
v.count,
v.max_query_time,
v.avg_query_time,
}
end
end
proxy.response.resultset.rows = rows
return proxy.PROXY_SEND_RESULT
elseif norm_query == "DELETE FROM `histogram` . `queries` " then
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
}
proxy.global.norm_queries = {}
return proxy.PROXY_SEND_RESULT
elseif norm_query == "SELECT * FROM `histogram` . `tables` " then
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
resultset = {
fields = {
{ type = proxy.MYSQL_TYPE_STRING,
name = "table" },
{ type = proxy.MYSQL_TYPE_LONG,
name = "reads" },
{ type = proxy.MYSQL_TYPE_LONG,
name = "writes" },
}
}
}
local rows = {}
if proxy.global.tables then
for k, v in pairs(proxy.global.tables) do
rows[#rows + 1] = {
k,
v.reads,
v.writes,
}
end
end
proxy.response.resultset.rows = rows
return proxy.PROXY_SEND_RESULT
elseif norm_query == "DELETE FROM `histogram` . `tables` " then
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
}
proxy.global.tables = {}
return proxy.PROXY_SEND_RESULT
end
if proxy.global.config.histogram.collect_queries or
proxy.global.config.histogram.collect_tables then
proxy.queries:append(1, packet)
return proxy.PROXY_SEND_QUERY
end
end
end
function read_query_result(inj)
local cmd = commands.parse(inj.query)
if cmd.type == proxy.COM_QUERY then
local tokens = assert(tokenizer.tokenize(cmd.query))
local norm_query = tokenizer.normalize(tokens)
if proxy.global.config.histogram.collect_queries then
if not proxy.global.norm_queries[norm_query] then
proxy.global.norm_queries[norm_query] = {
count = 0,
max_query_time = 0,
avg_query_time = 0
}
end
-- set new max if necessary
if inj.query_time > proxy.global.norm_queries[norm_query].max_query_time then
proxy.global.norm_queries[norm_query].max_query_time = inj.query_time
end
-- build rolling average
proxy.global.norm_queries[norm_query].avg_query_time =
((proxy.global.norm_queries[norm_query].avg_query_time * proxy.global.norm_queries[norm_query].count) +
inj.query_time) / (proxy.global.norm_queries[norm_query].count + 1)
proxy.global.norm_queries[norm_query].count = proxy.global.norm_queries[norm_query].count + 1
end
if proxy.global.config.histogram.collect_tables then
-- extract the tables from the queries
tables = parser.get_tables(tokens)
for table, qtype in pairs(tables) do
if not proxy.global.tables[table] then
proxy.global.tables[table] = {
reads = 0,
writes = 0
}
end
if qtype == "read" then
proxy.global.tables[table].reads = proxy.global.tables[table].reads + 1
else
proxy.global.tables[table].writes = proxy.global.tables[table].writes + 1
end
end
end
end
end
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