Module: BlackStack::Deployer::CommandModule

Included in:
Command
Defined in:
lib/blackstack-deployer.rb

Overview

define attributes and methods of a routine’s command

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#command ⇒ Object

Returns the value of attribute command.



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# File 'lib/blackstack-deployer.rb', line 178

def command
  @command
end

#matches ⇒ Object

Returns the value of attribute matches.



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# File 'lib/blackstack-deployer.rb', line 178

def matches
  @matches
end

#nomatches ⇒ Object

Returns the value of attribute nomatches.



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# File 'lib/blackstack-deployer.rb', line 178

def nomatches
  @nomatches
end

#sudo ⇒ Object

Returns the value of attribute sudo.



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# File 'lib/blackstack-deployer.rb', line 178

def sudo
  @sudo
end

Class Method Details

.descriptor_errors(c) ⇒ Object 



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# File 'lib/blackstack-deployer.rb', line 180

def self.descriptor_errors(c)
  errors = []

  # validate: h is a hash
  errors << "The command descriptor is not a hash" unless c.is_a?(Hash)

  # validate: the hash c has a key :command
  errors << "The command descriptor does not have a key :command" unless c.has_key?(:command)

  # validate: the value of c[:command] is a string or symbol
  errors << "The value of c[:command] is not a string and is not a symbol" unless c[:command].is_a?(String) || c[:command].is_a?(Symbol)

  # validate: if the key :sudo exists, then its value is a boolean
  if c.has_key?(:sudo)
    errors << "The value of c[:sudo] is not a boolean" unless c[:sudo].is_a?(TrueClass) || c[:sudo].is_a?(FalseClass)
  end

  # if the parameter h[:name] is a symbol
  if c[:command].is_a?(Symbol)
    if c[:command] == :reboot
      # :reboot is a reserved word, so it is fine to call :reboot
    else
      # validate: existis a routine with a the value c[:command].to_s on its :name key
      errors << "The routine with the name #{c[:command].to_s} does not exist" unless BlackStack::Deployer::routines.select { |r| r.name == c[:command].to_s }.size > 0
    end
  end

  # if c[:matches] exists
  if c.has_key?(:matches)
    # validate: the value of c[:matches] must by a regex or an array
    errors << "The value of the key :matches is not a regex nor an array" unless c[:matches].is_a?(Regexp) || c[:matches].is_a?(Array)
    # if c[:matches] is a array
    if c[:matches].is_a?(Array)
      # validate: each element in the the array c[:matches] is a regex
      c[:matches].each do |m|
        errors += BlackStack::Deployer::MatchModule.descriptor_errors(m)
      end # each
    end # if c[:matches].is_a?(Array)
  end # if :matches exists

  # if c[:nomatches] exists
  if c.has_key?(:nomatches)
    # validate: the value of c[:nomatches] must by a regex or an array
    errors << "The value of the key :nomatches is not a regex nor an array" unless c[:nomatches].is_a?(Regexp) || c[:nomatches].is_a?(Array)
    # if c[:nomatches] is a array
    if c[:nomatches].is_a?(Array)
      # validate: each element in the the array c[:nomatches] is a hash
      c[:nomatches].each do |m|
        errors += BlackStack::Deployer::NoMatchModule.descriptor_errors(m)
      end # each
    end # if c[:matches].is_a?(Array)
  end # if :matches exists
  # 
  errors.uniq
end

Instance Method Details

#initialize(h) ⇒ Object

def self.descriptor_error(h)



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# File 'lib/blackstack-deployer.rb', line 236

def initialize(h)
  errors = BlackStack::Deployer::CommandModule.descriptor_errors(h)
  raise "The node descriptor is not valid: #{errors.uniq.join(".\n")}" if errors.length > 0
  self.command = h[:command]
  self.sudo = h[:sudo].nil? ? true : h[:sudo]
  self.matches = []
  self.nomatches = []
  if h.has_key?(:matches)
    if h[:matches].is_a?(Regexp)
      self.matches << BlackStack::Deployer::Match.new(h[:matches])
    else
      h[:matches].each do |m|
        self.matches << BlackStack::Deployer::Match.new(m)
      end
    end
  end
  if h.has_key?(:nomatches)
    if h[:nomatches].is_a?(Regexp)
      self.nomatches << BlackStack::Deployer::NoMatch.new(h[:nomatches])
    else
      h[:nomatches].each do |m|
        self.nomatches << BlackStack::Deployer::NoMatch.new(m)
      end
    end
  end                                                                                                                       
end

#run(node) ⇒ Object

def to_hash



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# File 'lib/blackstack-deployer.rb', line 278

def run(node)
  errors = []
  code = self.command
  output = nil

  # if code is a symbol
  if code.is_a?(Symbol)

    # if code is equel than :reboot
    if code == :reboot
      # call the node reboot method
      node.reboot
    else
      # look for a routine with this name
      r = BlackStack::Deployer.routines.select { |r| r.name == code.to_s }.first
      if !r.nil?
        r.run(node)
      else
        raise "The routine #{code.to_s} does not exist"
      end
    end

  # if code is a string
  elsif code.is_a?(String)
    # replacing parameters
    code.scan(/%[a-zA-Z0-9\_]+%/).each do |p|
      if p == '%eth0_ip%' # reserved parameter
        # TODO: move the method eth0_ip to the blackstack-nodes library
        code.gsub!(p, node.eth0_ip) 
      elsif p == '%timestamp%' # reserved parameter
        # TODO: move this to a timestamp function on blackstack-core
        code.gsub!(p, Time.now.to_s.gsub(/\D/, '')) 
      else
        if node.parameters.has_key?(p.gsub(/%/, '').to_sym)
          code.gsub!(p, node.parameters[p.gsub(/%/, '').to_sym].to_s)
        else
          raise "The parameter #{p} does not exist in the node descriptor #{node.parameters.to_s}"
        end
      end
    end

    # running the command
    output = node.exec(code, self.sudo)

    # validation: at least one of the matches should happen
    if self.matches.size > 0
      i = 0
      self.matches.each do |m|
        if m.validate(output).size == 0 # no errors 
          i += 1
        end
      end
      errors << "Command output doesn't match with any of the :matches" if i == 0
    end # if self.matches.size > 0 
    
    # validation: no one of the nomatches should happen
    self.nomatches.each do |m|
      errors += m.validate(output)
    end
  end # elsif code.is_a?(String)

  # return a hash descriptor of the command result 
  {
    :command => self.command,
    :code => code,
    :output => output,
    :errors => errors,
  }
end

#to_hash ⇒ Object

def initialize(h)



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# File 'lib/blackstack-deployer.rb', line 263

def to_hash
  h = {}
  h[:command] = self.command
  h[:sudo] = self.sudo
  h[:matches] = []
  h[:nomatches] = []
  self.matches.each do |m|
    h[:matches] << m.to_hash
  end
  self.nomatches.each do |m|
    h[:nomatches] << m.to_hash
  end
  h
end