Class: MysqlManager::Utilities

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql_manager/utilities.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Utilities

Returns a new instance of Utilities.



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# File 'lib/mysql_manager/utilities.rb', line 32

def initialize(options = {})
  options[:dsn] ||= "DBI:Mysql:mysql:localhost"
  options[:username] ||= "root"
  options[:password] ||= ""

  @log = Logger.new(STDERR)

  # connect to the MySQL server
  @dbh = DBI.connect(options[:dsn], options[:username], options[:password])
end

Instance Attribute Details

#dbh ⇒ Object

Returns the value of attribute dbh.



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# File 'lib/mysql_manager/utilities.rb', line 30

def dbh
  @dbh
end

#dry_run ⇒ Object

Returns the value of attribute dry_run.



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# File 'lib/mysql_manager/utilities.rb', line 30

def dry_run
  @dry_run
end

#log ⇒ Object

Returns the value of attribute log.



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# File 'lib/mysql_manager/utilities.rb', line 30

def log
  @log
end

Instance Method Details

#hotcopy(options = {}) ⇒ Object 



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# File 'lib/mysql_manager/utilities.rb', line 229

def hotcopy(options = {})
  begin
    t_start = Time.now.to_f
    # ensure mysql directory exists
    unless File.directory?(options[:data_dir])
      raise FileNotFoundException.new("Unable to open mysql data dir #{options[:data_dir]}")
    end

    # test connection
    @log.info("Testing connection...")
    @dbh.do("SELECT 1") unless @dry_run

    rsync = []
    rsync << options[:rsync_bin]
    rsync << options[:rsync_args]
    rsync << options[:data_dir] + '/'
    rsync << options[:backup_dir] + '/'

    # create target directory if it does not already exist (unless ofcourse we're syncing to a remote target denoted by rsync:// or an rsync module denoted by ::)
    if options[:backup_dir] !~ /^rsync:\/\// && options[:backup_dir] !~ /::/
      unless File.directory?(options[:backup_dir])
        @log.info("Creating #{options[:backup_dir]}")
        run ['mkdir', '-p', options[:backup_dir]] unless @dry_run
      end
    end

    rsync.flatten!

    t_rsync = Time.now.to_f
    t_rsync_elapsed = Time.now.to_f
    while t_rsync_elapsed > options[:rsync_ttl]
      # first do a raw rsync without table locks
      @log.info("Performing first-pass rsync without table locks")
      run rsync unless @dry_run
      t_rsync_elapsed = Time.now.to_f - t_rsync
      @log.info("Rsync took #{t_rsync_elapsed} seconds")
      sleep 1
      t_rsync = Time.now.to_f
    end

    # then flush tables with read lock
    @log.info("Locking tables")
    t_lock = Time.now.to_f
    @dbh.do("FLUSH TABLES WITH READ LOCK")  unless @dry_run

    # re-sync the delats
    @log.info("Performing second-pass rsync with table locks")
    run rsync unless @dry_run
  
    # release locks
    @log.info("Unlocking tables")
    @dbh.do('UNLOCK TABLES') unless @dry_run
    @log.info("Total lock time #{Time.now.to_f - t_lock} seconds")
    @log.info("Total elapsed time #{Time.now.to_f - t_start} seconds")

  rescue DBI::DatabaseError => e
    @log.debug(@dbh.last_statement)
    @log.warn(e.message)
    exit(1)
  end
end

#kill_queries(options = {}) ⇒ Object 



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# File 'lib/mysql_manager/utilities.rb', line 43

def kill_queries(options = {})
  options[:max_query_time] ||= -1
  options[:user] ||= []
  options[:host] ||= []
  options[:query] ||= []
  options[:command] ||= []
  options[:state] ||= []
  options[:db] ||= []

  @dbh.execute("SHOW FULL PROCESSLIST") do |sth|
    sth.fetch_hash() do |row| 
      next if row['Command'] == 'Binlog Dump'
      next if row['User'] == 'system user'

      results = []
      options.each_pair do |field,criteria|
        case field
        when :max_query_time
          if criteria >= 0
            if row['Time'].to_i > criteria
              results << true
            else
              results << false
            end
          end
        when :user, :host, :query, :command, :state, :db
          
          col = field == :query ? 'Info' : field.to_s.capitalize

          if criteria.length > 0
            matched = false
            criteria.each do |pattern|
              if pattern.match(row[col])
                matched = true
                break
              end
            end
            #puts "#{row[col]} #{criteria.inspect} == #{matched}"
            results << matched
          end
        end
      end
      # Some conditions need to apply
      #puts results.inspect
      if results.length > 0
        # None of them may be false
        unless results.include?(false)
          begin
            @log.info("Killing id:#{row['Id']} db:#{row['db']} user:#{row['User']} command:#{row['Command']} state:#{row['State']} time:#{row['Time']} host:#{row['Host']} query:#{row['Info']} rows_sent:#{row['Rows_sent']} rows_examined:#{row['Rows_examined']} rows_read:#{row['Rows_read']}")
            @dbh.do("KILL #{row['Id']}") unless @dry_run
          rescue DBI::DatabaseError => e
            @log.warn(e.message)
          end
        end
      end
    end
  end
end

#reload_my_cnf(options = {}) ⇒ Object 



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# File 'lib/mysql_manager/utilities.rb', line 102

def reload_my_cnf(options = {})
  options[:config] ||= '/etc/my.cnf'
  options[:groups] ||= ['mysqld', 'mysqld_safe', 'mysql.server', 'mysql_server', 'server', 'mysql']

  variables = {}
  @dbh.execute("SHOW VARIABLES") do |sth|
    sth.fetch_hash() do |row| 
      variables[row['Variable_name']] = row['Value']
    end
  end
  unless File.exists?(options[:config])
    raise FileNotFoundException.new("Unable to open file #{options[:config]}")
  end
  
  my_cnf = ParseConfig.new(options[:config])
  my_cnf.groups.each do |group|
  if options[:groups].include?(group)
      @log.debug("loading values from [#{group}]")
      my_cnf[group].each_pair do |k,v|
        next if v.nil? || v.empty?
        if variables.has_key?(k)
          begin
            v = v.to_s
            v = v.to_i if v =~ /^(\d+)$/
            v = $1.to_i * (1024) if v =~ /^(\d+)K$/
            v = $1.to_i * (1024*1024) if v =~ /^(\d+)M$/
            v = $1.to_i * (1024*1024*1024) if v =~ /^(\d+)G$/
            if v.instance_of?(Integer) || v.instance_of?(Fixnum)
              sql = "SET GLOBAL #{k} = #{v}"
            else
              sql = "SET GLOBAL #{k} = '#{v}'"
            end
            @dbh.do(sql) unless @dry_run
            @log.info("set #{k}=#{v}")
          rescue DBI::DatabaseError => e
            @log.debug(@dbh.last_statement)
            @log.warn(e.message)
          end
        end
      end
    end 
  end
end

#run(cmd) ⇒ Object 



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# File 'lib/mysql_manager/utilities.rb', line 220

def run(cmd)
  stdout, stderr, status = Open3.capture3(Shellwords.join(cmd))
  if status != 0
    puts stderr
    raise Exception.new("execution of command failed")
  end
  return status
end

#skip_replication_errors(options = {}) ⇒ Object 



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# File 'lib/mysql_manager/utilities.rb', line 146

def skip_replication_errors(options = {})
  options[:max_errors] ||= -1
  options[:max_error_duration] ||= -1
  options[:min_healthy_duration] ||= -1
  options[:log_frequency] ||= 10

  begin
    # get server version string and display it
    max_seconds_behind = 0
    t_start = Time.now.to_f
    t_last_error = nil
    t_last_error_elapsed = 0
    t_last_log = 0
    t_elapsed = 0
    t_recovered = 0
    errors = 0
    while (options[:max_errors] < 0 || errors < options[:max_errors]) && (options[:max_error_duration] < 0 || t_last_error_elapsed < options[:max_error_duration])
      @dbh.execute("SHOW SLAVE STATUS") do |sth|
        t_now = Time.now.to_f
  
        sth.fetch_hash() do |row| 
          seconds_behind = row['Seconds_Behind_Master']
          if seconds_behind.nil?
            @log.info("replication broken")
            @log.info("last error: #{row['Last_Error'].gsub(/\r?\n/, '')}")

            @dbh.do("SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1") unless @dry_run
            @dbh.do("START SLAVE")
            errors += 1
            max_seconds_behind = 0
            t_last_error = t_now
          elsif seconds_behind == 0
            t_recovered = t_now if t_recovered == 0
            if t_last_log == 0 || t_now - t_last_log > options[:log_frequency]
              @log.info("fully caught up with master")
              t_last_log = t_now
            end
            if (t_min_healthy_duration >=0) && (t_now - t_recovered > t_min_healthy_duration)
              @log.info("satisfied health duration window")
              break
            end
          else
            seconds_behind = seconds_behind.to_f
            t_recovered = 0
            t_last_error_elapsed = t_last_error.nil? ? 0 : t_now - t_last_error
            t_elapsed = t_now - t_start
            max_seconds_behind = [max_seconds_behind, seconds_behind].max
            t_catchup = max_seconds_behind - seconds_behind
            t_rate = t_elapsed == 0 ? 1 : t_catchup/t_elapsed
            t_left = t_rate > 0 ? seconds_behind/t_rate : 0
            if t_left > 60*60
              t_left_str = sprintf('%.2f hours', t_left/(60*60))
            elsif t_left > 60
              t_left_str = sprintf('%.2f mins', t_left/60)
            else
              t_left_str = sprintf('%.2f secs', t_left)
            end
            if t_last_log == 0 || t_now.to_f - t_last_log.to_f > options[:log_frequency]
              @log.info("#{seconds_behind} seconds behind master; #{t_catchup} seconds caught up; #{sprintf('%.2f', t_rate)} seconds/second; #{t_left_str} left; #{errors} errors; last error #{sprintf('%.2f', t_last_error_elapsed)} seconds ago")
              t_last_log = t_now
            end

            sleep 0.100
          end
        end
      end
    end
  rescue Interrupt
    @log.info("Aborted by user")
  rescue DBI::DatabaseError => e
    @log.error("Error code: #{e.err}: #{e.errstr}")
  end
end