Class: MysqlIsolatedServer

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql_isolated_server.rb,
lib/mysql_isolated_server/version.rb

Constant Summary collapse

MYSQL_BASE_DIR = 
"/usr"
VERSION = 
"0.2.2"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ MysqlIsolatedServer 



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# File 'lib/mysql_isolated_server.rb', line 10

def initialize(options = {})
  @base = Dir.mktmpdir("mysql_isolated", "/tmp")
  @mysql_data_dir="#{@base}/mysqld"
  @mysql_socket="#{@mysql_data_dir}/mysqld.sock"
  @params = options[:params]
  @load_data_path = options[:data_path]
  @port = options[:port]
  @allow_output = options[:allow_output]
  @server_id = rand(2**31)
end

Instance Attribute Details

#base ⇒ Object (readonly)

Returns the value of attribute base.



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# File 'lib/mysql_isolated_server.rb', line 6

def base
  @base
end

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/mysql_isolated_server.rb', line 7

def params
  @params
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/mysql_isolated_server.rb', line 6

def pid
  @pid
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/mysql_isolated_server.rb', line 6

def port
  @port
end

Instance Method Details

#boot! ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 73

def boot!
  @port ||= grab_free_port
  system("rm -Rf #{@mysql_data_dir}")
  system("mkdir #{@mysql_data_dir}")
  if @load_data_path
    system("cp -a #{@load_data_path}/* #{@mysql_data_dir}")
    system("rm -f #{@mysql_data_dir}/relay-log.info")
  else
    mysql_install_db = locate_executable("mysql_install_db")

    idb_path = File.dirname(mysql_install_db)
    system("(cd #{idb_path}/..; mysql_install_db --datadir=#{@mysql_data_dir} --user=`whoami`) >/dev/null 2>&1")
    system("cp #{File.expand_path(File.dirname(__FILE__))}/tables/user.* #{@mysql_data_dir}/mysql")
  end

  up!

  tzinfo_to_sql = locate_executable("mysql_tzinfo_to_sql5", "mysql_tzinfo_to_sql")
  raise "could not find mysql_tzinfo_to_sql" unless tzinfo_to_sql
  system("#{tzinfo_to_sql} /usr/share/zoneinfo 2>/dev/null | mysql -h127.0.0.1 --database=mysql --port=#{@port} -u root mysql ")
  connection.query("SET GLOBAL time_zone='UTC'")
  connection.query("SET GLOBAL server_id=#{@server_id}")
end

#cleanup! ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 162

def cleanup!
  system("rm -Rf #{base}")
end

#connection ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 35

def connection
  @cx ||= Mysql2::Client.new(:host => "127.0.0.1", :port => @port, :username => "root", :password => "", :database => "mysql")
end

#down! ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 65

def down!
  Process.kill("TERM", @pid)
  while (Process.kill 0, @pid rescue false)
    sleep 1
  end
  @cx = nil
end

#exec_server(cmd) ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 113

def exec_server(cmd)
  cmd.strip!
  cmd.gsub!(/\\\n/, ' ')
  devnull = File.open("/dev/null", "w")
  system("mkdir -p #{base}/tmp")
  system("chmod 0777 #{base}/tmp")

  original_pid = $$
  mysql_pid = nil

  middle_pid = fork do
    mysql_pid = fork do
      ENV["TMPDIR"] = "#{base}/tmp"
      if !@allow_output
        STDOUT.reopen(devnull)
        STDERR.reopen(devnull)
      end

      exec(cmd)
    end

    # begin waiting for the parent (or mysql) to die; at_exit is hard to control when interacting with test/unit
    # we can also be killed by our parent with down! and up!
    #
    trap("TERM") do
      Process.kill("KILL", mysql_pid) rescue nil
      cleanup!
      exit!
    end

    while true
      begin
        Process.kill(0, original_pid)
        Process.kill(0, mysql_pid)
      rescue Exception => e
        Process.kill("KILL", mysql_pid) rescue nil
        cleanup!
        exit!
      end

      sleep 1
    end

    at
  end

  @pid = middle_pid
end

#grab_free_port ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 97

def grab_free_port
  while true
    candidate=9000 + rand(50_000)

    begin
      socket = Socket.new(:INET, :STREAM, 0)
      socket.bind(Addrinfo.tcp("127.0.0.1", candidate))
      socket.close
      return candidate
    rescue Exception => e
      puts e
    end
  end
end

#kill! ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 166

def kill!
  return unless @pid
  system("kill -KILL #{@pid}")
end

#locate_executable(*candidates) ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 45

def locate_executable(*candidates)
  output = `which #{candidates.join(' ')}`
  raise "I couldn't find any of these: #{candidates.join(',')} in $PATH" if output.chomp.empty?
  output.split("\n").first
end

#make_slave_of(master) ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 21

def make_slave_of(master)
  master_binlog_info = master.connection.query("show master status").first
  connection.query("    change master to master_host='127.0.0.1',\n                     master_port=\#{master.port},\n                     master_user='root', master_password='',\n                     master_log_file='\#{master_binlog_info['File']}',\n                     master_log_pos=\#{master_binlog_info['Position']}\n    EOL\n  )\n  connection.query(\"SLAVE START\")\n  connection.query(\"SET GLOBAL READ_ONLY=1\")\nend\n"

#set_rw(rw) ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 39

def set_rw(rw)
  ro = rw ? 0 : 1
  connection.query("SET GLOBAL READ_ONLY=#{ro}")
end

#up! ⇒ Object 



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# File 'lib/mysql_isolated_server.rb', line 51

def up!
  mysqld = locate_executable("mysqld")

  exec_server "      \#{mysqld} --no-defaults --default-storage-engine=innodb \\\n              --datadir=\#{@mysql_data_dir} --pid-file=\#{@base}/mysqld.pid --port=\#{@port} \\\n              \#{@params} --socket=\#{@mysql_data_dir}/mysql.sock --log-bin --log-slave-updates\n  EOL\n\n  while !system(\"mysql -h127.0.0.1 --port=\#{@port} --database=mysql -u root -e 'select 1' >/dev/null 2>&1\")\n    sleep(0.1)\n  end\nend\n"