Class: SnapEbs

Inherits:
Object
  • Object
show all
Includes:
Options, Snapshotter
Defined in:
lib/snap_ebs.rb,
lib/snap_ebs/options.rb

Defined Under Namespace

Modules: Options, Snapshotter Classes: Plugin

Constant Summary collapse

@@logger = 
nil

Constants included from Snapshotter

Snapshotter::AWS_INSTANCE_ID_URL

Instance Attribute Summary

Attributes included from Snapshotter

#compute

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Snapshotter

#take_snapshots

Methods included from Options

#option_parser

Class Method Details

.logger(logfile) ⇒ Object 



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# File 'lib/snap_ebs.rb', line 13

def self.logger logfile
  unless @@logger
    @@logger = Logger.new(logfile || STDOUT)
    @@logger.level = Logger::DEBUG
    @@logger.formatter = proc do |severity, datetime, progname, msg|
      "[#{severity}] #{datetime.strftime("%Y-%m-%d %H:%M:%S")} #{msg}\n"
    end
  end

  @@logger
end

.logger=(logger_) ⇒ Object 



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# File 'lib/snap_ebs.rb', line 25

def self.logger= logger_
  @@logger = logger_
end

Instance Method Details

#execute ⇒ Object

Entry point for the ‘snap-ebs` binary



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

def execute
  option_parser.parse!
  logger.debug "Debug logging enabled"
  run
end

#logger ⇒ Object

Get the global logger instance ‘logger.debug ’reticulating splines’‘



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

def logger
  # HACK -- the logfile argument only gets used on the first invocation
  SnapEbs.logger options.logfile
end

#options ⇒ Object

Get the root ‘options` object, and instance of OpenStruct



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# File 'lib/snap_ebs/options.rb', line 55

def options
  @options ||= OpenStruct.new
end

#plugins ⇒ Object 



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# File 'lib/snap_ebs.rb', line 29

def plugins
  @plugins ||= registered_plugins.collect { |klass| klass.new }
end

#registered_plugins ⇒ Object 



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# File 'lib/snap_ebs.rb', line 33

def registered_plugins
  SnapEbs::Plugin.registered_plugins
end

#run ⇒ Object

Executes plugin before hooks, takes the snapshot, then runs the after hooks. Plugin hooks are called within ‘rescue` blocks to isolate errors from affecting other plugins or the snapshot plugins. Note that non- standard exceptions (i.e. out of memory or keyboard interrupt) will still cause a execution to abort.



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# File 'lib/snap_ebs.rb', line 42

def run
  plugins.each do |plugin|
    begin
      plugin.before if plugin.options.enable
    rescue => e
      logger.error "Encountered error while running the #{plugin.name} plugin's before hook"
      logger.error e
    end
  end

  take_snapshots

  plugins.each do |plugin|
    begin
      plugin.after if plugin.options.enable
    rescue => e
      logger.error "Encountered error while running the #{plugin.name} plugin's after hook"
      logger.error e
    end
  end
end