Module: MCollective::RPC

Included in:
Application
Defined in:
lib/mcollective/rpc.rb,
lib/mcollective/rpc/agent.rb,
lib/mcollective/rpc/audit.rb,
lib/mcollective/rpc/reply.rb,
lib/mcollective/rpc/stats.rb,
lib/mcollective/rpc/client.rb,
lib/mcollective/rpc/result.rb,
lib/mcollective/rpc/helpers.rb,
lib/mcollective/rpc/request.rb,
lib/mcollective/rpc/progress.rb,
lib/mcollective/rpc/actionrunner.rb

Overview

Toolset to create a standard interface of client and agent using an RPC metaphor, standard compliant agents will make it easier to create generic clients like web interfaces etc

Defined Under Namespace

Classes: ActionRunner, Agent, Audit, Client, Helpers, Progress, Reply, Request, Result, Stats

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.const_missing(const_name) ⇒ Object 



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# File 'lib/mcollective/rpc.rb', line 171

def self.const_missing(const_name)
  super unless const_name == :DDL

  Log.warn("MCollective::RPC::DDL is deprecatd, please use MCollective::DDL instead")
  MCollective::DDL
end

.discovered(discovered) ⇒ Object

means for other classes to drop discovered hosts into this module its a bit hacky but needed so that the mixin methods like printrpcstats can easily get access to it without users having to pass it around in params.



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# File 'lib/mcollective/rpc.rb', line 103

def self.discovered(discovered)
  @@discovered = discovered # rubocop:disable Style/ClassVars
end

.stats(stats) ⇒ Object

means for other classes to drop stats into this module its a bit hacky but needed so that the mixin methods like printrpcstats can easily get access to it without users having to pass it around in params.



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# File 'lib/mcollective/rpc.rb', line 95

def self.stats(stats)
  @@stats = stats # rubocop:disable Style/ClassVars
end

Instance Method Details

#empty_filter?(options) ⇒ Boolean

Wrapper for MCollective::Util.empty_filter? to make clients less fugly to write - ticket #18

Returns:

  • (Boolean) 


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# File 'lib/mcollective/rpc.rb', line 163

def empty_filter?(options)
  if options.include?(:filter)
    Util.empty_filter?(options[:filter])
  else
    Util.empty_filter?(options)
  end
end

#printrpc(result, flags = {}) ⇒ Object

Prints the result of an RPC call.

In the default quiet mode - no flattening or verbose - only results that produce an error will be printed

To get details of each result run with the -v command line option.



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# File 'lib/mcollective/rpc.rb', line 142

def printrpc(result, flags={})
  verbose = !!@options[:verbose]
  verbose = flags[:verbose] || verbose
  flatten = flags[:flatten] || false
  format = @options[:output_format]
  forced_mode = @options[:force_display_mode] || false

  result_text = Helpers.rpcresults(result, :verbose => verbose, :flatten => flatten, :format => format, :force_display_mode => forced_mode)

  if result.is_a?(Array) && format == :console
    puts "\n%s\n" % [result_text]
  else
    # when we get just one result to print dont pad them all with
    # blank spaces etc, just print the individual result with no
    # padding
    puts result_text unless result_text == ""
  end
end

#printrpcstats(flags = {}) ⇒ Object

Prints stats, requires stats to be saved from elsewhere using the MCollective::RPC.stats method.

If you’ve passed -v on the command line a detailed stat block will be printed, else just a one liner.

You can pass flags into it:

printrpcstats :caption => "Foo", :summarize => true

This will use “Foo” as the caption to the stats in verbose mode and print out any aggregate summary information if present



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# File 'lib/mcollective/rpc.rb', line 119

def printrpcstats(flags={})
  return unless @options[:output_format] == :console

  flags = {:summarize => false, :caption => "rpc stats"}.merge(flags)

  verbose = !!@options[:verbose]

  begin
    stats = @@stats
  rescue
    puts("no stats to display")
    return
  end

  puts stats.report(flags[:caption], flags[:summarize], verbose)
end

#rpcclient(agent, flags = {}) ⇒ Object

Wrapper to create clients, supposed to be used as a mixin:

include MCollective::RPC

exim = rpcclient(“exim”) printrpc exim.mailq

or

rpcclient(“exim”) do |exim|

printrpc exim.mailq

end

It will take a few flags:

:configfile => "etc/client.cfg"
:options => options
:exit_on_failure => true

Options would be a build up options hash from the Optionparser you can use the rpcoptions helper to create this

:exit_on_failure is true by default, and causes the application to exit if there is a failure constructing the RPC client. Set this flag to false to cause an Exception to be raised instead.



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# File 'lib/mcollective/rpc.rb', line 56

def rpcclient(agent, flags={})
  configfile = flags[:configfile] || Util.config_file_for_user
  options = flags[:options] || nil

  if flags.key?(:exit_on_failure)
    exit_on_failure = flags[:exit_on_failure]
  else
    # We exit on failure by default for CLI-friendliness
    exit_on_failure = true
  end

  begin
    if options
      rpc = Client.new(agent, :configfile => options[:config], :options => options)
    else
      rpc = Client.new(agent, :configfile => configfile)
    end

    @options = rpc.options
  rescue Exception => e # rubocop:disable Lint/RescueException:
    if exit_on_failure
      puts("Could not create RPC client: #{e}")
      exit!
    else
      raise e
    end
  end

  if block_given?
    yield(rpc)
  else
    rpc
  end
end

#rpcoptions ⇒ Object

Creates a standard options hash, pass in a block to add extra headings etc see Optionparser



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# File 'lib/mcollective/rpc.rb', line 21

def rpcoptions
  oparser = MCollective::Optionparser.new({:verbose => false, :progress_bar => true}, "filter")

  oparser.parse do |parser, opts|
    yield(parser, opts) if block_given?

    Helpers.add_simplerpc_options(parser, opts)
  end
end