Class: Drebs::Main

Inherits:
Object
  • Object
show all
Defined in:
lib/drebs/main.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ Main

Returns a new instance of Main.



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# File 'lib/drebs/main.rb', line 7

def initialize(params)
  unless @config = params['config'].clone()
    raise "No config_file_path passed!" 
  end
  unless @db = params['db']
    raise "No db passed!" 
  end
  update_strategies(@config.delete("strategies"))
  @cloud = Drebs::Cloud.new(@config)
  @log = Logger.new(@config["log_path"])
  @log.level = Logger::WARN
end

Instance Attribute Details

#cloud ⇒ Object (readonly)

Returns the value of attribute cloud.



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# File 'lib/drebs/main.rb', line 4

def cloud
  @cloud
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/drebs/main.rb', line 3

def config
  @config
end

#db ⇒ Object (readonly)

Returns the value of attribute db.



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# File 'lib/drebs/main.rb', line 5

def db
  @db
end

Class Method Details

.check_config(reference_config, other_config) ⇒ Object 



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# File 'lib/drebs/main.rb', line 24

def Main.check_config(reference_config, other_config)
  reference_config = reference_config.clone()
  reference_strategy = reference_config.delete('strategies').last
  
  errors = []
  
  config_ok = reference_config.keys.each do |key|
    config_ok = other_config.has_key?(key) and other_config[key] != nil and other_config[key] != ""
    errors.push("Missing key/value for key: #{key}") unless config_ok
  end
  
  strategies = other_config['strategies']
  if strategies.is_a?(Array) and strategies.first()
    strategies.each_with_index do |strategy, i|
      strategies_ok = reference_strategy.keys.all?{|key|
        unless strategy.has_key?(key) and strategy[key] != nil and strategy[key] != ""
          errors.push("Missing key/value for key: #{key}") unless config_ok
        end
      }
    end
  else
    errors.push("Missing strategies array")
  end
  
  return errors
end

Instance Method Details

#check_cloud ⇒ Object 



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# File 'lib/drebs/main.rb', line 20

def check_cloud
  @cloud.check_cloud()
end

#execute ⇒ Object 



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# File 'lib/drebs/main.rb', line 133

def execute
  active_strategies = @db[:strategies].filter({:status=>"active"})
  
  #Decrement time_til_next_run, save
  active_strategies.each do |s|
    @db[:strategies].filter(:config=>s[:config]).update(
      :time_til_next_run => (s[:time_til_next_run].to_i - 1)
    )
  end
  
  active_strategies = @db[:strategies].filter({:status=>"active"})

  #backup_now = strategies where time_til_next_run <= 0
  backup_now = active_strategies.to_a.select{|s| s[:time_til_next_run].to_i <= 0}
  
  #loop over strategies grouped by mount_point
  backup_now.group_by{|s| s[:mount_point]}.each do |mount_point, strategies|
    pre_snapshot_tasks = strategies.map{|s| s[:pre_snapshot_tasks].split(",")}.flatten.uniq
    post_snapshot_tasks = strategies.map{|s| s[:pre_snapshot_tasks].split(",")}.flatten.uniq
  
    @log.info("creating snapshot of #{mount_point}")
    begin
      snapshot = @cloud.create_local_snapshot(pre_snapshot_tasks, post_snapshot_tasks, mount_point)
  
      strategies.collect {|s|
        snapshots = s[:snapshots].split(",")
        snapshots.select!{|snapshot| @cloud.local_ebs_ids.include? snapshot.split(":")[1]}
        snapshots.push(
          s[:status]=='active' ?
            "#{snapshot[:aws_id]}:#{snapshot[:aws_volume_id]}" : nil
        )
        @db[:strategies].filter(:config=>s[:config]).update(
          :snapshots => snapshots.join(","),
          :time_til_next_run => s[:time_between_runs]
        )
      }

    rescue Exception => error
      @log.error("Exception occured during backup: #{error.message}\n#{error.backtrace.join("\n")}")
      send_email("DREBS Error!", "AWS Instance: #{@cloud.find_local_instance[:aws_instance_id]}\n#{error.message}\n#{error.backtrace.join("\n")}")
    end
  end

  prune_backups(@db[:strategies])
end

#prune_backups(strategies) ⇒ Object 



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# File 'lib/drebs/main.rb', line 94

def prune_backups(strategies)
  to_prune = []

  strategies.each do |strategy|
    snapshots = strategy[:snapshots].split(",")
    if snapshots.uniq==[nil]
      @db[:strategies].filter(:config=>strategy[:config]).update(:snapshots => "")
    elsif snapshots == []
    elsif snapshots.count > strategy[:num_to_keep].to_i
      # only remove it from EC2 if there are no other strategies with this snapshot
      to_prune.push(Map.for({
        :snapshot => snapshots.first,
        :strategy => strategy
      }))
    end
  end

  to_prune.each do |prune_obj|
    snapshot = prune_obj.snapshot
    strategy = prune_obj.strategy

    # make sure that no other strategies have this snapshot
    strategies_with_snapshot = @db[:strategies].all.select{|strategy| strategy[:snapshots].split(',').include?(snapshot)}

    if strategies_with_snapshot.count == 1
      begin
        @cloud.ec2.delete_snapshot(snapshot.split(":")[0])
      rescue RightAws::AwsError => e
        type = e.errors.first.first rescue ''
        raise unless type == "InvalidSnapshot.NotFound"
      end
    end

    # update the strategy's snapshots to include all except given snapshot
    new_snapshots = strategy[:snapshots].split(',').delete_if{|snap| snap == snapshot}.join(',')
    @db[:strategies].filter(:config=>strategy[:config]).update(:snapshots => new_snapshots)
  end
end

#send_email(subject, body) ⇒ Object 



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# File 'lib/drebs/main.rb', line 79

def send_email(subject, body)
  host = @config['email_host']
  port = @config['email_port']
  domain = @config['email_domain']
  username = @config['email_user']
  password = @config['email_password']
  
  msg = "Subject: #{subject}\n\n#{body}"
  smtp = Net::SMTP.new(host, port)
  smtp.enable_starttls
  smtp.start(domain, username, password, :login) {|smtp|
    smtp.send_message(msg, username, @config['email_on_exception'])
  }
end

#update_strategies(new_strategies) ⇒ Object 



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# File 'lib/drebs/main.rb', line 52

def update_strategies(new_strategies)
  new_strategies.each do |strategy|
    exists = @db[:strategies].filter(:config=>strategy.to_yaml).update(:status=>"active")
    if exists==0
      pre_snapshot_tasks = strategy['pre_snapshot_tasks']
      pre_snapshot_tasks = pre_snapshot_tasks ? pre_snapshot_tasks.join(",") : ""
      post_snapshot_tasks = strategy['post_snapshot_tasks']
      post_snapshot_tasks = post_snapshot_tasks ? post_snapshot_tasks.join(",") : ""
      @db[:strategies].insert(
        :config=>strategy.to_yaml,
        :snapshots=>"",
        :status=>"active",
        :time_til_next_run => strategy['hours_between'],
        :time_between_runs => strategy['hours_between'],
        :num_to_keep => strategy['num_to_keep'],
        :pre_snapshot_tasks => pre_snapshot_tasks,
        :post_snapshot_tasks => post_snapshot_tasks,
        :mount_point => strategy['mount_point']
      )
    end
  end
  deactivate_filter = new_strategies.map do |strategy|
    "(config != '#{strategy.to_yaml}' and status == 'active')"
  end.join(" and ")
  @db[:strategies].filter(deactivate_filter).update(:status => 'inactive')
end