Bogo

A collection of helper libraries. What's in the box:

Animal strings

Convert camel cased strings to snake case or snake cased strings to camel case:

require 'bogo'

class Stringer
  include Bogo::AnimalStrings
end

str = Stringer.new
puts str.snake('CamelCasedString')
puts str.camel('snake_cased_string')

Smash

Extension of the Hash class. It makes use of the hashie library and adds a few extra features as well:

Included hashie modules:

• Hashie::Extensions::IndifferentAccess
• Hashie::Extensions::MergeInitializer
• Hashie::Extensions::DeepMerge
• Hashie::Extensions::Coercion

Added extras:

Conversion

Will convert from Hash to Smash. This conversion includes Hash types found within Arrays:

require 'bogo'

inst = {:a => 1, 'b' => 2, :c => [{:z => true}]}.to_smash
puts inst[:a]
puts inst['c'].first['z']

and we can convert from Smash to Hash as well:

require 'bogo'

inst = {:a => 1, 'b' => 2, :c => [{:z => true}]}.to_smash
puts inst.class
puts inst[:c].first.class
inst = inst.to_hash
puts inst.class
puts inst['c'].first.class

Path Walking

Values can be returned if given a path. If the path does not exist a nil will be return instead of raising an exception:

require 'bogo'

inst = Smash.new(:a => {:b => {:c => {:d => 1}}})
puts inst.get(:a, :b, :c, :d)
puts inst.get(:a, :c, :x, :z)

Default value on missing path

Use #fetch to provide default value if path does not exist. The last value in the list will be used as the returned value:

require 'bogo'

inst = Smash.new(:a => 1)
puts inst.fetch(:b, :c, 2)

Set value at path

Set deeply nested values by providing the path. The last value in the list will be set:

require 'bogo'

inst = Smash.new
inst.set(:a, :b, :c, :d, :e, 1)
puts inst.get(:a, :b, :c, :d, :e)

Checksums

Checksum will generate a new Smash instance with sorted keys and then generate a SHA256 digest:

require 'bogo'

puts Smash.new(:a => 1, :b => 2, :c => 3).checksum
puts Smash.new(:c => 3, :b => 2, :a => 1).checksum

Freezing

Freeze entire smash structure:

require 'bogo'

inst = {:a => 'hi', :b => {:c => 'bye'}}.to_smash(:freeze)
puts inst[:a].frozen? 'Frozen' : 'Thawed'
puts inst[:b].frozen? 'Frozen' : 'Thawed'
puts inst[:b][:c].frozen? 'Frozen' : 'Thawed'

Arrays

The #to_smash helper is also attached to Array to fully convert an Arrays internals to Smashes

require 'bogo'

puts [{:a => 1}].to_smash.first.class.name

Constants

Turn a string into a constant:

require 'bogo'

const = Object.new.extend(Bogo::Constants)
p const.constantize('Bogo::Constants')

Get the namespace of a constant:

require 'bogo'

const = Object.new.extend(Bogo::Constants)
p const.namespace('Bogo::Constants')

Memoization

Memoization helpers for thread and object local, thread local, and global memoization:

require 'bogo'

class Memo
  include Bogo::Memoization

  def object_value(provided_value)
    memoize(:value){ provided_value }
  end

  def thread_value(provided_value)
    memoize(:value, true){ provided_value }
  end

  def global_value(provided_value)
    memoize(:value, :global){ provided_value }
  end
end

obj1 = Memo.new
obj2 = Memo.new

obj1.object_value('ohai')
obj1.thread_value('obai')
obj1.global_value('ohey')

puts '--- obj1 start'
puts obj1.object_value('fubar')
puts obj1.thread_value('fubar')
puts obj1.global_value('fubar')
puts '--- obj1 end'
puts '--- obj2 start'
puts obj2.object_value('fubar')
puts obj2.thread_value('fubar')
puts obj2.global_value('fubar')
puts '--- obj2 end'

Lazy

Easily define attributes within a class. Provides type checking, coercion, and callback integration for dependencies and missing values.

require 'bogo'

class MyData
  include Bogo::Lazy

  attribute :name, String, :default => 'MyData'
  attribute :data_id, [String, Numeric]
  attribute :count, Float, :coerce => lambda{|v| v.to_f}
  attribute :remote_id, Integer, :depends => :remote_loader
  attribute :stuff, String

  on_missing :load_things

  def remote_loader
    data[:remote_id] = 42
  end

  def load_things
    data[:stuff] = 'ALL THE THINGS'
  end
end

data = MyData.new

puts data.name
data.name = 'New name!'
puts data.name
data.data_id = 1
puts data.data_id
data.data_id = 'one'
puts data.data_id
begin
  data.data_id = :one
rescue TypeError => e
  puts "#{e.class}: #{e}"
end
data.count = '1'
p data.count
puts data.remote_id
puts data.stuff
p data.dirty?(:name)
p data.data_id
p data.data
p data.dirty
p data.attributes
p data.dirty?
data.valid_state
p data.dirty?
p data.data

PriorityQueue

Queue items based on a given score. Score can be provided as a numerical value, or as the result of a block. By default, the item with the lowest score has the highest priority.

require 'bogo'

q = Bogo::PriorityQueue.new
q.push('a', 3)
q.push('b', 1)
puts q.pop

This will print "b" as it has the lowest score (highest priority). If a high score is prefered to designate highest priority, that can be set when initializing the instance of the queue:

require 'bogo'

q = Bogo::PriorityQueue.new(:highscore)

Scores can also be provided as blocks which will be evaluated prior to #pop:

require 'bogo'

q = Bogo::PriorityQueue.new(:highscore)
q.push('a'){ Time.now.to_i }
q.push('b', Time.now.to_i)
sleep(1)
puts q.pop

This will print "a" as its score will be higher when popped.

EphemeralFile

This is just like a Tempfile (this is just a subclass) except that it will delete itself when closed.

require 'bogo'

e_file = Bogo::EphemeralFile.new('bogo')
path = e_file.path
puts "File exists: #{File.exists?(path)}"
e_file.close
puts "File exists: #{File.exists?(path)}"

Retry

Retry an action until success or maximum number of attempts has been reached.

Bogo::Retry

This is an abstract class and does not provide actual retry functionality. Custom concrete implementations must define a #wait_on_failure method that provides the number of seconds to wait until the next attempt.

The Bogo::Retry does provide an easy way to generate a retry instance:

Bogo::Retry.build(:flat, :wait_interval => 2) do
  puts 'This is run within a Bogo::Retry::Flat instance!'
end

If the value of the action is required, disable auto run and explicitly start the retry:

value = Bogo::Retry.build(:flat, :auto_run => false) do
  puts 'This is run within a Bogo::Retry::Flat instance!'
  42
end.run!

A block can also be provided to run! which will be called when an exception is rescued to determine if the request should be retried:

value = Bogo::Retry.build(:flat, :auto_run => false) do
  puts 'This is run within a Bogo::Retry::Flat instance!'
  42
end.run! do |exception|
  exception.is_a?(ErrorThatShouldBeRetried)
end

Bogo::Retry::Flat

The flat retry implementation will always wait the wait_interval value before retry.

• :wait_interval - Numeric (default: 5)

Bogo::Retry::Linear

The linear retry implementation will increase the wait time between retries at a linear rate before retry:

• :wait_interval - Numeric (default: 5)

Bogo::Retry::Exponential

The exponential retry implementation will increase the wait time between retries at an exponential rate before retry:

• :wait_interval - Numeric (default: 5)
• :wait_exponent - Numeric (default: 2)

Bogo::Logger

This is a wrapped stdlib Logger instance to provide thread-safe access for logging. It includes a Bogo::Logger#named method for creating sub-loggers.

require 'bogo'

base = Bogo::Logger.new
base.progname = 'base'
base.info 'test'

sub = base.named(:sub)
sub.info 'test'

Bogo::Logger::Helpers

Adds a #logger method when included which provides access to the global logger. Name can be customized using .logger_name.

require 'bogo'

class Fubar
  class Thing
    include Bogo::Logger::Helpers
    logger_name(:thing)

    def test
      logger.info "test"
    end
  end
end

Info

• Repository: https://github.com/spox/bogo