initial

.gitignore

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+*.log

mysqllog.lua

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+--[[
+
+   Copyright (C) 2007 MySQL AB
+
+   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
+
+--]]
+
+---
+-- Uses MySQL-Proxy to log your queries
+--
+-- Written by Giuseppe Maxia, based on examples provided
+-- by Jan Knesckhe
+--
+-- This script will log the current date and time, the connection id
+-- and the query to a file named "mysql.log" in the current directory
+--
+
+local log_file = 'mysql.log'
+
+local fh = io.open(log_file, "a+")
+
+function read_query( packet )
+  if string.byte(packet) == proxy.COM_QUERY then
+    local query = string.sub(packet, 2)
+    fh:write( string.format("%s %6d -- %s \n",
+      os.date('%Y-%m-%d %H:%M:%S'),
+      proxy.connection.server.thread_id,
+      query
+    ))
+    fh:flush()
+  end
+end

replay

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+#!/usr/bin/env ruby
+require 'rubygems'
+require 'active_record'
+
+dir = ARGV[0] || raise('gimme rails dir as ARGV[0]')
+logfile = 'mysql.log'
+
+def connect(dir)
+  config = YAML.load(File.read("#{dir}/config/database.yml"))['staging']
+  ActiveRecord::Base.establish_connection(config.merge(:port=>3306))
+end
+
+def replay(logfile)
+  sql = File.readlines(logfile).map do |line|
+    #2010-01-13 11:06:16    443 -- SELECT version FROM schema_migrations\n
+    line.split(' -- ',2)[1].strip
+  end
+
+  puts "replaying #{sql.size} lines of sql ..."
+
+  parallel(4, sql) do |line|
+    ActiveRecord::Base.connection.execute(line)
+  end
+end
+
+def parallel(count, data)
+  threads = []
+  data.in_groups_of(data.size/count, false).each do |group|
+    threads << Thread.new do
+      group.each{|x| yield(x)}
+    end
+  end
+  threads.each{|t| t.join}
+end
+
+connect(dir)
+replay(logfile)
+

run

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+#!/usr/bin/env ruby
+puts "change config to 127.0.0.1:4040"
+
+Process.fork do
+  system "mysql-proxy --proxy-lua-script=mysqllog.lua"
+end
+
+logfile = "mysql.log"
+`touch #{logfile}`
+system "tail -f #{logfile}"