Class: Warg::HostCollection

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/warg.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ HostCollection

Returns a new instance of HostCollection.



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# File 'lib/warg.rb', line 1126

def initialize
  @hosts = []
end

Class Method Details

.from(value) ⇒ Object 



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# File 'lib/warg.rb', line 1085

def self.from(value)
  case value
  when String, Host
    new.add(value)
  when HostCollection
    value
  when Array
    is_array_host_specification = value.any? do |item|
      # Check key=value items by looking for `=` missing `?`.  If it has `?`, then we
      # assume it is in the form `host?key=value`
      String === item and item.index("=") and not item.index("?")
    end

    if is_array_host_specification
      new.add(value)
    else
      value.inject(new) { |collection, host_data| collection.add(host_data) }
    end
  when Hash
    value.inject(new) do |collection, (property, hosts_data)|
      name, value = property.to_s.split(":", 2)

      if value.nil?
        value = name
        name = "stage"
      end

      from(hosts_data).each do |host|
        host[name] = value
        collection.add(host)
      end

      collection
    end
  when nil
    new
  else
    raise InvalidHostDataError.new(value)
  end
end

Instance Method Details

#==(other) ⇒ Object Also known as: eql? 



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# File 'lib/warg.rb', line 1148

def ==(other)
  self.class == other.class &&
    length == other.length &&
    # both are the same length and their intersection is the same length (all the same
    # elements in common)
    length == @hosts.&(other.hosts).length
end

#add(host_data) ⇒ Object 



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# File 'lib/warg.rb', line 1138

def add(host_data)
  @hosts << Host.from(host_data)

  self
end

#create_file_from(content, path:, mode: 0644) ⇒ Object 



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# File 'lib/warg.rb', line 1162

def create_file_from(content, path:, mode: 0644)
  each do |host|
    host.create_file_from(content, path: path, mode: mode)
  end
end

#download(path) ⇒ Object 



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# File 'lib/warg.rb', line 1174

def download(path)
  map do |host|
    host.download(path)
  end
end

#each ⇒ Object 



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# File 'lib/warg.rb', line 1180

def each
  if block_given?
    @hosts.each { |host| yield host }
  else
    enum_for(:each)
  end

  self
end

#length ⇒ Object 



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# File 'lib/warg.rb', line 1158

def length
  @hosts.length
end

#one ⇒ Object 



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# File 'lib/warg.rb', line 1130

def one
  if @hosts.empty?
    raise "cannot pick a host from `#{inspect}'; collection is empty"
  end

  HostCollection.from @hosts.sample
end

#run(order:, &block) ⇒ Object 



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# File 'lib/warg.rb', line 1202

def run(order:, &block)
  strategy = Executor.for(order)
  executor = strategy.new(self)
  executor.run(&block)
end

#run_command(command, order: :parallel, &setup) ⇒ Object 



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# File 'lib/warg.rb', line 1196

def run_command(command, order: :parallel, &setup)
  run(order: order) do |host, result|
    result.update host.run_command(command, &setup)
  end
end

#run_script(script, order: :parallel, &setup) ⇒ Object 



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# File 'lib/warg.rb', line 1190

def run_script(script, order: :parallel, &setup)
  run(order: order) do |host, result|
    result.update host.run_script(script, &setup)
  end
end

#to_a ⇒ Object 



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# File 'lib/warg.rb', line 1208

def to_a
  @hosts.dup
end

#upload(file, to:) ⇒ Object 



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# File 'lib/warg.rb', line 1168

def upload(file, to:)
  each do |host|
    host.upload(file, to: to)
  end
end

#with(**filters) ⇒ Object 



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# File 'lib/warg.rb', line 1144

def with(**filters)
  HostCollection.from(select { |host| host.matches?(**filters) })
end