Class: MCollective::RPC::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/mcollective/rpc/client.rb

Overview

The main component of the Simple RPC client system, this wraps around MCollective::Client and just brings in a lot of convention and standard approached.

Constant Summary collapse

@@initial_options = 
nil

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(agent, flags = {}) ⇒ Client

Creates a stub for a remote agent, you can pass in an options array in the flags which will then be used else it will just create a default options array with filtering enabled based on the standard command line use.

rpc = RPC::Client.new("rpctest", :configfile => "client.cfg", :options => options)

You typically would not call this directly you’d use MCollective::RPC#rpcclient instead which is a wrapper around this that can be used as a Mixin



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# File 'lib/mcollective/rpc/client.rb', line 20

def initialize(agent, flags = {})
  if flags.include?(:options)
    initial_options = flags[:options]

  elsif @@initial_options
    initial_options = Marshal.load(@@initial_options)

  else
    oparser = MCollective::Optionparser.new({ :verbose => false,
                                              :progress_bar => true,
                                              :mcollective_limit_targets => false,
                                              :batch_size => nil,
                                              :batch_sleep_time => 1 },
                                            "filter")

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

      Helpers.add_simplerpc_options(parser, opts)
    end

    @@initial_options = Marshal.dump(initial_options)
  end

  @initial_options = initial_options

  @config = initial_options[:config]
  @client = MCollective::Client.new(@initial_options)

  @stats = Stats.new
  @agent = agent
  @timeout = initial_options[:timeout] || 5
  @verbose = initial_options[:verbose]
  @filter = initial_options[:filter] || Util.empty_filter
  @discovered_agents = nil
  @progress = initial_options[:progress_bar]
  @limit_targets = initial_options[:mcollective_limit_targets]
  @limit_method = Config.instance.rpclimitmethod
  @limit_seed = initial_options[:limit_seed] || nil
  @output_format = initial_options[:output_format] || :console
  @force_direct_request = false
  @reply_to = initial_options[:reply_to]
  @discovery_method = initial_options[:discovery_method]
  if !@discovery_method
    @discovery_method = Config.instance.default_discovery_method
    @default_discovery_method = true
  else
    @default_discovery_method = false
  end
  @discovery_options = initial_options[:discovery_options] || []
  @force_display_mode = initial_options[:force_display_mode] || false

  @batch_size = initial_options[:batch_size] || 0
  @batch_sleep_time = Float(initial_options[:batch_sleep_time] || 1)
  @batch_mode = determine_batch_mode(@batch_size)

  agent_filter agent

  @discovery_timeout = @initial_options.fetch(:disctimeout, nil) || Config.instance.discovery_timeout

  @collective = @client.collective
  @ttl = initial_options[:ttl] || Config.instance.ttl
  @publish_timeout = initial_options[:publish_timeout] || Config.instance.publish_timeout
  @threaded = initial_options[:threaded] || Config.instance.threaded

  # if we can find a DDL for the service override
  # the timeout of the client so we always magically
  # wait appropriate amounts of time.
  #
  # We add the discovery timeout to the ddl supplied
  # timeout as the discovery timeout tends to be tuned
  # for local network conditions and fact source speed
  # which would other wise not be accounted for and
  # some results might get missed.
  #
  # We do this only if the timeout is the default 5
  # seconds, so that users cli overrides will still
  # get applied
  #
  # DDLs are required, failure to find a DDL is fatal
  @ddl = DDL.new(agent)
  @stats.ddl = @ddl
  @timeout = @ddl.meta[:timeout] + discovery_timeout if @timeout == 5

  # allows stderr and stdout to be overridden for testing
  # but also for web apps that might not want a bunch of stuff
  # generated to actual file handles
  if initial_options[:stderr]
    @stderr = initial_options[:stderr]
  else
    @stderr = STDERR
    @stderr.sync = true
  end

  if initial_options[:stdout]
    @stdout = initial_options[:stdout]
  else
    @stdout = STDOUT
    @stdout.sync = true
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object

Magic handler to invoke remote methods

Once the stub is created using the constructor or the RPC#rpcclient helper you can call remote actions easily:

ret = rpc.echo(:msg => "hello world")

This will call the ‘echo’ action of the ‘rpctest’ agent and return the result as an array, the array will be a simplified result set from the usual full MCollective::Client#req with additional error codes and error text:

:sender => "remote.box.com",
:statuscode => 0,
:statusmsg => "OK",
:data => "hello world"

If :statuscode is 0 then everything went find, if it’s 1 then you supplied the correct arguments etc but the request could not be completed, you’ll find a human parsable reason in :statusmsg then.

Codes 2 to 5 maps directly to UnknownRPCAction, MissingRPCData, InvalidRPCData and UnknownRPCError see below for a description of those, in each case :statusmsg would be the reason for failure.

To get access to the full result of the MCollective::Client#req calls you can pass in a block:

rpc.echo(:msg => "hello world") do |resp|
   pp resp
end

In this case resp will the result from MCollective::Client#req. Instead of returning simple text and codes as above you’ll also need to handle the following exceptions:

UnknownRPCAction - There is no matching action on the agent MissingRPCData - You did not supply all the needed parameters for the action InvalidRPCData - The data you did supply did not pass validation UnknownRPCError - Some other error prevented the agent from running

During calls a progress indicator will be shown of how many results we’ve received against how many nodes were discovered, you can disable this by setting progress to false:

rpc.progress = false

This supports a 2nd mode where it will send the SimpleRPC request and never handle the responses. It’s a bit like UDP, it sends the request with the filter attached and you only get back the requestid, you have no indication about results.

You can invoke this using:

puts rpc.echo(:process_results => false)

This will output just the request id.

Batched processing is supported:

printrpc rpc.ping(:batch_size => 5)

This will do everything exactly as normal but communicate to only 5 agents at a time



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# File 'lib/mcollective/rpc/client.rb', line 235

def method_missing(method_name, *args, &block)
  # set args to an empty hash if nothings given
  args = args[0]
  args = {} if args.nil?

  action = method_name.to_s

  @stats.reset

  validate_request(action, args)

  # TODO(ploubser): The logic here seems poor. It implies that it is valid to
  # pass arguments where batch_mode is set to false and batch_mode > 0.
  # If this is the case we completely ignore the supplied value of batch_mode
  # and do our own thing.

  # if a global batch size is set just use that else set it
  # in the case that it was passed as an argument
  batch_mode = args.include?(:batch_size) || @batch_mode
  batch_size = args.delete(:batch_size) || @batch_size
  batch_sleep_time = args.delete(:batch_sleep_time) || @batch_sleep_time

  # if we were given a batch_size argument thats 0 and batch_mode was
  # determined to be on via global options etc this will allow a batch_size
  # of 0 to disable or batch_mode for this call only
  batch_mode = determine_batch_mode(batch_size)

  # Handle single target requests by doing discovery and picking
  # a random node.  Then do a custom request specifying a filter
  # that will only match the one node.
  if @limit_targets
    target_nodes = pick_nodes_from_discovered(@limit_targets)
    Log.debug("Picked #{target_nodes.join(',')} as limited target(s)")

    custom_request(action, args, target_nodes, {"identity" => /^(#{target_nodes.join('|')})$/}, &block)
  elsif batch_mode
    call_agent_batched(action, args, options, batch_size, batch_sleep_time, &block)
  else
    call_agent(action, args, options, :auto, &block)
  end
end

Instance Attribute Details

#agent ⇒ Object (readonly)

Returns the value of attribute agent.



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# File 'lib/mcollective/rpc/client.rb', line 7

def agent
  @agent
end

#batch_mode ⇒ Object (readonly)

Returns the value of attribute batch_mode.



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# File 'lib/mcollective/rpc/client.rb', line 7

def batch_mode
  @batch_mode
end

#batch_size ⇒ Object

Returns the value of attribute batch_size.



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# File 'lib/mcollective/rpc/client.rb', line 7

def batch_size
  @batch_size
end

#batch_sleep_time ⇒ Object

Returns the value of attribute batch_sleep_time.



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# File 'lib/mcollective/rpc/client.rb', line 7

def batch_sleep_time
  @batch_sleep_time
end

#client ⇒ Object (readonly)

Returns the value of attribute client.



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# File 'lib/mcollective/rpc/client.rb', line 7

def client
  @client
end

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/mcollective/rpc/client.rb', line 6

def config
  @config
end

#ddl ⇒ Object (readonly)

Returns the value of attribute ddl.



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# File 'lib/mcollective/rpc/client.rb', line 7

def ddl
  @ddl
end

#default_discovery_method ⇒ Object (readonly)

Returns the value of attribute default_discovery_method.



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# File 'lib/mcollective/rpc/client.rb', line 8

def default_discovery_method
  @default_discovery_method
end

#discovery_method ⇒ Object

Returns the value of attribute discovery_method.



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# File 'lib/mcollective/rpc/client.rb', line 8

def discovery_method
  @discovery_method
end

#discovery_options ⇒ Object

Returns the value of attribute discovery_options.



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# File 'lib/mcollective/rpc/client.rb', line 8

def discovery_options
  @discovery_options
end

#filter ⇒ Object

Returns the value of attribute filter.



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# File 'lib/mcollective/rpc/client.rb', line 6

def filter
  @filter
end

#limit_method ⇒ Object

Returns the value of attribute limit_method.



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# File 'lib/mcollective/rpc/client.rb', line 7

def limit_method
  @limit_method
end

#limit_seed ⇒ Object (readonly)

Returns the value of attribute limit_seed.



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# File 'lib/mcollective/rpc/client.rb', line 8

def limit_seed
  @limit_seed
end

#limit_targets ⇒ Object

Returns the value of attribute limit_targets.



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# File 'lib/mcollective/rpc/client.rb', line 7

def limit_targets
  @limit_targets
end

#output_format ⇒ Object (readonly)

Returns the value of attribute output_format.



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# File 'lib/mcollective/rpc/client.rb', line 7

def output_format
  @output_format
end

#progress ⇒ Object

Returns the value of attribute progress.



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# File 'lib/mcollective/rpc/client.rb', line 6

def progress
  @progress
end

#reply_to ⇒ Object

Returns the value of attribute reply_to.



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# File 'lib/mcollective/rpc/client.rb', line 6

def reply_to
  @reply_to
end

#stats ⇒ Object (readonly)

Returns the value of attribute stats.



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# File 'lib/mcollective/rpc/client.rb', line 7

def stats
  @stats
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/mcollective/rpc/client.rb', line 6

def timeout
  @timeout
end

#ttl ⇒ Object

Returns the value of attribute ttl.



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# File 'lib/mcollective/rpc/client.rb', line 6

def ttl
  @ttl
end

#verbose ⇒ Object

Returns the value of attribute verbose.



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# File 'lib/mcollective/rpc/client.rb', line 6

def verbose
  @verbose
end

Instance Method Details

#agent_filter(agent) ⇒ Object

Sets the agent filter



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# File 'lib/mcollective/rpc/client.rb', line 431

def agent_filter(agent)
  @filter["agent"] = @filter["agent"] | [agent]
  @filter["agent"].compact!
  reset
end

#aggregate_reply(reply, aggregate) ⇒ Object 



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# File 'lib/mcollective/rpc/client.rb', line 707

def aggregate_reply(reply, aggregate)
  return nil unless aggregate

  aggregate.call_functions(reply)
  return aggregate
rescue Exception => e
  Log.error("Failed to calculate aggregate summaries for reply from %s, calculating summaries disabled: %s: %s (%s)" % [reply[:senderid], e.backtrace.first, e.to_s, e.class])
  return nil
end

#call_agent(action, args, opts, disc = :auto, &block) ⇒ Object

Handles traditional calls to the remote agents with full stats blocks, non blocks and everything else supported.

Other methods of calling the nodes can reuse this code by for example specifying custom options and discovery data



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# File 'lib/mcollective/rpc/client.rb', line 883

def call_agent(action, args, opts, disc=:auto, &block)
  # Handle fire and forget requests and make sure
  # the :process_results value is set appropriately
  #
  # specific reply-to requests should be treated like
  # fire and forget since the client will never get
  # the responses
  if args[:process_results] == false || @reply_to
    return fire_and_forget_request(action, args)
  else
    args[:process_results] = true
  end

  # Do discovery when no specific discovery array is given
  #
  # If an array is given set the force_direct_request hint that
  # will tell the message object to be a direct request one
  if disc == :auto
    discovered = discover
  else
    @force_direct_request = true if Config.instance.direct_addressing
    discovered = disc
  end

  req = new_request(action.to_s, args)

  message = Message.new(req, nil, {:agent => @agent, :type => :request, :collective => @collective, :filter => opts[:filter], :options => opts})
  message.discovered_hosts = discovered.clone

  results = []
  respcount = 0

  if discovered.size > 0
    message.type = :direct_request if @force_direct_request

    if @progress && !block_given?
      twirl = Progress.new
      @stdout.puts
      @stdout.print twirl.twirl(respcount, discovered.size)
    end

    aggregate = load_aggregate_functions(action, @ddl)

    @client.req(message) do |resp|
      respcount += 1

      if block_given?
        aggregate = process_results_with_block(action, resp, block, aggregate)
      else
        @stdout.print twirl.twirl(respcount, discovered.size) if @progress

        result, aggregate = process_results_without_block(resp, action, aggregate)

        results << result
      end
    end

    if @initial_options[:sort]
      results.sort!
    end

    @stats.aggregate_summary = aggregate.summarize if aggregate
    @stats.aggregate_failures = aggregate.failed if aggregate
    @stats.client_stats = @client.stats
  else
    @stderr.print("\nNo request sent, we did not discover any nodes.")
  end

  @stats.finish_request

  RPC.stats(@stats)

  @stdout.print("\n\n") if @progress

  if block_given?
    return stats
  else
    return [results].flatten
  end
end

#call_agent_batched(action, args, opts, batch_size, sleep_time, &block) ⇒ Object

Calls an agent in a way very similar to call_agent but it supports batching the queries to the network.

The result sets, stats, block handling etc is all exactly like you would expect from normal call_agent.

This is used by method_missing and works only with direct addressing mode



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# File 'lib/mcollective/rpc/client.rb', line 779

def call_agent_batched(action, args, opts, batch_size, sleep_time, &block)
  raise "Batched requests requires direct addressing" unless Config.instance.direct_addressing
  raise "Cannot bypass result processing for batched requests" if args[:process_results] == false
  validate_batch_size(batch_size)

  sleep_time = Float(sleep_time)

  Log.debug("Calling #{agent}##{action} in batches of #{batch_size} with sleep time of #{sleep_time}")

  @force_direct_request = true

  discovered = discover
  results = []
  respcount = 0

  if discovered.size > 0
    req = new_request(action.to_s, args)

    aggregate = load_aggregate_functions(action, @ddl)

    if @progress && !block_given?
      twirl = Progress.new
      @stdout.puts
      @stdout.print twirl.twirl(respcount, discovered.size)
    end

    if (batch_size =~ /^(\d+)%$/)
      # determine batch_size as a percentage of the discovered array's size
      batch_size = (discovered.size / 100.0 * Integer($1)).ceil
    else
      batch_size = Integer(batch_size)
    end

    @stats.requestid = nil
    processed_nodes = 0

    discovered.in_groups_of(batch_size) do |hosts|
      message = Message.new(req, nil, {:agent => @agent,
                                       :type => :direct_request,
                                       :collective => @collective,
                                       :filter => opts[:filter],
                                       :options => opts})

      # first time round we let the Message object create a request id
      # we then re-use it for future requests to keep auditing sane etc
      @stats.requestid = message.create_reqid unless @stats.requestid
      message.requestid = @stats.requestid

      message.discovered_hosts = hosts.clone.compact

      @client.req(message) do |resp|
        respcount += 1

        if block_given?
          aggregate = process_results_with_block(action, resp, block, aggregate)
        else
          @stdout.print twirl.twirl(respcount, discovered.size) if @progress

          result, aggregate = process_results_without_block(resp, action, aggregate)

          results << result
        end
      end

      if @initial_options[:sort]
        results.sort!
      end

      @stats.noresponsefrom.concat @client.stats[:noresponsefrom]
      @stats.responses += @client.stats[:responses]
      @stats.blocktime += @client.stats[:blocktime] + sleep_time
      @stats.totaltime += @client.stats[:totaltime]
      @stats.discoverytime += @client.stats[:discoverytime]

      processed_nodes += hosts.length
      if (discovered.length > processed_nodes)
        sleep sleep_time
      end
    end

    @stats.aggregate_summary = aggregate.summarize if aggregate
    @stats.aggregate_failures = aggregate.failed if aggregate
  else
    @stderr.print("\nNo request sent, we did not discover any nodes.")
  end

  @stats.finish_request

  RPC.stats(@stats)

  @stdout.print("\n") if @progress

  if block_given?
    return stats
  else
    return [results].flatten
  end
end

#class_filter(klass) ⇒ Object

Sets the class filter



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# File 'lib/mcollective/rpc/client.rb', line 407

def class_filter(klass)
  @filter["cf_class"] = @filter["cf_class"] | [klass]
  @filter["cf_class"].compact!
  reset
end

#collective=(c) ⇒ Object

Sets the collective we are communicating with



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# File 'lib/mcollective/rpc/client.rb', line 583

def collective=(c)
  raise "Unknown collective #{c}" unless Config.instance.collectives.include?(c)

  @collective = c
  @client.options = options
  reset
end

#compound_filter(filter) ⇒ Object

Set a compound filter



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# File 'lib/mcollective/rpc/client.rb', line 445

def compound_filter(filter)
  @filter["compound"] = @filter["compound"] |  [Matcher.create_compound_callstack(filter)]
  reset
end

#custom_request(action, args, expected_agents, filter = {}, &block) ⇒ Object

Constructs custom requests with custom filters and discovery data the idea is that this would be used in web applications where you might be using a cached copy of data provided by a registration agent to figure out on your own what nodes will be responding and what your filter would be.

This will help you essentially short circuit the traditional cycle of:

mc discover / call / wait for discovered nodes

by doing discovery however you like, contructing a filter and a list of nodes you expect responses from.

Other than that it will work exactly like a normal call, blocks will behave the same way, stats will be handled the same way etcetc

If you just wanted to contact one machine for example with a client that already has other filter options setup you can do:

puppet.custom_request(“runonce”, {}, [“your.box.com”], => “your.box.com”)

This will do runonce action on just ‘your.box.com’, no discovery will be done and after receiving just one response it will stop waiting for responses

If direct_addressing is enabled in the config file you can provide an empty hash as a filter, this will force that request to be a directly addressed request which technically does not need filters. If you try to use this mode with direct addressing disabled an exception will be raise



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# File 'lib/mcollective/rpc/client.rb', line 305

def custom_request(action, args, expected_agents, filter = {}, &block)
  validate_request(action, args)

  if filter == {} && !Config.instance.direct_addressing
    raise "Attempted to do a filterless custom_request without direct_addressing enabled, preventing unexpected call to all nodes"
  end

  @stats.reset

  custom_filter = Util.empty_filter
  custom_options = options.clone

  # merge the supplied filter with the standard empty one
  # we could just use the merge method but I want to be sure
  # we dont merge in stuff that isnt actually valid
  ["identity", "fact", "agent", "cf_class", "compound"].each do |ftype|
    if filter.include?(ftype)
      custom_filter[ftype] = [filter[ftype], custom_filter[ftype]].flatten
    end
  end

  # ensure that all filters at least restrict the call to the agent we're a proxy for
  custom_filter["agent"] << @agent unless custom_filter["agent"].include?(@agent)
  custom_options[:filter] = custom_filter

  # Fake out the stats discovery would have put there
  @stats.discovered_agents([expected_agents].flatten)

  # Handle fire and forget requests
  #
  # If a specific reply-to was set then from the client perspective this should
  # be a fire and forget request too since no response will ever reach us - it
  # will go to the reply-to destination
  if args[:process_results] == false || @reply_to
    return fire_and_forget_request(action, args, custom_filter)
  end

  # Now do a call pretty much exactly like in method_missing except with our own
  # options and discovery magic
  if block_given?
    call_agent(action, args, custom_options, [expected_agents].flatten) do |r|
      block.call(r)
    end
  else
    call_agent(action, args, custom_options, [expected_agents].flatten)
  end
end

#disconnect ⇒ Object

Disconnects cleanly from the middleware



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# File 'lib/mcollective/rpc/client.rb', line 125

def disconnect
  @client.disconnect
end

#discover(flags = {}) ⇒ Object

Does discovery based on the filters set, if a discovery was previously done return that else do a new discovery.

Alternatively if identity filters are given and none of them are regular expressions then just use the provided data as discovered data, avoiding discovery

Discovery can be forced if direct_addressing is enabled by passing in an array of nodes with :nodes or JSON data like those produced by mcollective RPC JSON output using :json

Will show a message indicating its doing discovery if running verbose or if the :verbose flag is passed in.

Use reset to force a new discovery



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# File 'lib/mcollective/rpc/client.rb', line 477

def discover(flags={})
  flags.keys.each do |key|
    raise "Unknown option #{key} passed to discover" unless [:verbose, :hosts, :nodes, :json].include?(key)
  end

  flags.include?(:verbose) ? verbose = flags[:verbose] : verbose = @verbose

  verbose = false unless @output_format == :console

  # flags[:nodes] and flags[:hosts] are the same thing, we should never have
  # allowed :hosts as that was inconsistent with the established terminology
  flags[:nodes] = flags.delete(:hosts) if flags.include?(:hosts)

  reset if flags[:nodes] || flags[:json]

  unless @discovered_agents
    # if either hosts or JSON is supplied try to figure out discovery data from there
    # if direct_addressing is not enabled this is a critical error as the user might
    # not have supplied filters so raise an exception
    if flags[:nodes] || flags[:json]
      raise "Can only supply discovery data if direct_addressing is enabled" unless Config.instance.direct_addressing

      hosts = []

      if flags[:nodes]
        hosts = Helpers.extract_hosts_from_array(flags[:nodes])
      elsif flags[:json]
        hosts = Helpers.extract_hosts_from_json(flags[:json])
      end

      raise "Could not find any hosts in discovery data provided" if hosts.empty?

      @discovered_agents = hosts
      @force_direct_request = true

    else
      identity_filter_discovery_optimization
    end
  end

  # All else fails we do it the hard way using a traditional broadcast
  unless @discovered_agents
    @stats.time_discovery :start

    @client.options = options

    # if compound filters are used the only real option is to use the mc
    # discovery plugin since its the only capable of using data queries etc
    # and we do not want to degrade that experience just to allow compounds
    # on other discovery plugins the UX would be too bad raising complex sets
    # of errors etc.
    @client.discoverer.force_discovery_method_by_filter(options[:filter])

    if verbose
      actual_timeout = @client.discoverer.discovery_timeout(discovery_timeout, options[:filter])

      if actual_timeout > 0
        @stderr.print("Discovering hosts using the %s method for %d second(s) .... " % [@client.discoverer.discovery_method, actual_timeout])
      else
        @stderr.print("Discovering hosts using the %s method .... " % [@client.discoverer.discovery_method])
      end
    end

    # if the requested limit is a pure number and not a percent
    # and if we're configured to use the first found hosts as the
    # limit method then pass in the limit thus minimizing the amount
    # of work we do in the discover phase and speeding it up significantly
    filter = @filter.merge({'collective' => @collective})
    if @limit_method == :first and @limit_targets.is_a?(Fixnum)
      @discovered_agents = @client.discover(filter, discovery_timeout, @limit_targets)
    else
      @discovered_agents = @client.discover(filter, discovery_timeout)
    end

    @stderr.puts(@discovered_agents.size) if verbose

    @force_direct_request = @client.discoverer.force_direct_mode?

    @stats.time_discovery :end
  end

  @stats.discovered_agents(@discovered_agents)
  RPC.discovered(@discovered_agents)

  @discovered_agents
end

#discovery_timeout ⇒ Object 



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# File 'lib/mcollective/rpc/client.rb', line 353

def discovery_timeout
  return @discovery_timeout if @discovery_timeout
  return @client.discoverer.ddl.meta[:timeout]
end

#discovery_timeout=(timeout) ⇒ Object 



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# File 'lib/mcollective/rpc/client.rb', line 358

def discovery_timeout=(timeout)
  @discovery_timeout = Float(timeout)

  # we calculate the overall timeout from the DDL of the agent and
  # the supplied discovery timeout unless someone specifically
  # specifies a timeout to the constructor
  #
  # But if we also then specifically set a discovery_timeout on the
  # agent that has to override the supplied timeout so we then
  # calculate a correct timeout based on DDL timeout and the
  # supplied discovery timeout
  @timeout = @ddl.meta[:timeout] + discovery_timeout
end

#fact_filter(fact, value = nil, operator = "=") ⇒ Object

Sets the fact filter



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# File 'lib/mcollective/rpc/client.rb', line 414

def fact_filter(fact, value=nil, operator="=")
  return if fact.nil?
  return if fact == false

  if value.nil?
    parsed = Util.parse_fact_string(fact)
    @filter["fact"] = @filter["fact"] | [parsed] unless parsed == false
  else
    parsed = Util.parse_fact_string("#{fact}#{operator}#{value}")
    @filter["fact"] = @filter["fact"] | [parsed] unless parsed == false
  end

  @filter["fact"].compact!
  reset
end

#fire_and_forget_request(action, args, filter = nil) ⇒ Object

for requests that do not care for results just return the request id and don’t do any of the response processing.

We send the :process_results flag with to the nodes so they can make decisions based on that.

Should only be called via method_missing



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# File 'lib/mcollective/rpc/client.rb', line 730

def fire_and_forget_request(action, args, filter=nil)
  validate_request(action, args)

  identity_filter_discovery_optimization

  req = new_request(action.to_s, args)

  filter = options[:filter] unless filter

  message = Message.new(req, nil, {:agent => @agent, :type => :request, :collective => @collective, :filter => filter, :options => options})
  message.reply_to = @reply_to if @reply_to

  if @force_direct_request || @client.discoverer.force_direct_mode?
    message.discovered_hosts = discover.clone
    message.type = :direct_request
  end

  client.sendreq(message, nil)
end

#help(template) ⇒ Object

Returns help for an agent if a DDL was found



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# File 'lib/mcollective/rpc/client.rb', line 130

def help(template)
  @ddl.help(template)
end

#identity_filter(identity) ⇒ Object

Sets the identity filter



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# File 'lib/mcollective/rpc/client.rb', line 438

def identity_filter(identity)
  @filter["identity"] = @filter["identity"] | [identity]
  @filter["identity"].compact!
  reset
end

#identity_filter_discovery_optimization ⇒ Object

if an identity filter is supplied and it is all strings no regex we can use that as discovery data, technically the identity filter is then redundant if we are in direct addressing mode and we could empty it out but this use case should only really be for a few -I’s on the CLI

For safety we leave the filter in place for now, that way we can support this enhancement also in broadcast mode.

This is only needed for the ‘mc’ discovery method, other methods might change the concept of identity to mean something else so we should pass the full identity filter to them



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# File 'lib/mcollective/rpc/client.rb', line 761

def identity_filter_discovery_optimization
  if options[:filter]["identity"].size > 0 && @discovery_method == "mc"
    regex_filters = options[:filter]["identity"].select{|i| i.match("^\/")}.size

    if regex_filters == 0
      @discovered_agents = options[:filter]["identity"].clone
      @force_direct_request = true if Config.instance.direct_addressing
    end
  end
end

#load_aggregate_functions(action, ddl) ⇒ Object 



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# File 'lib/mcollective/rpc/client.rb', line 696

def load_aggregate_functions(action, ddl)
  return nil unless ddl
  return nil unless ddl.action_interface(action).keys.include?(:aggregate)

  return Aggregate.new(ddl.action_interface(action))

rescue => e
  Log.error("Failed to load aggregate functions, calculating summaries disabled: %s: %s (%s)" % [e.backtrace.first, e.to_s, e.class])
  return nil
end

#new_request(action, data) ⇒ Object

Creates a suitable request hash for the SimpleRPC agent.

You’d use this if you ever wanted to take care of sending requests on your own - perhaps via Client#sendreq if you didn’t care for responses.

In that case you can just do:

msg = your_rpc.new_request("some_action", :foo => :bar)
filter = your_rpc.filter

your_rpc.client.sendreq(msg, msg[:agent], filter)

This will send a SimpleRPC request to the action some_action with arguments :foo = :bar, it will return immediately and you will have no indication at all if the request was receieved or not

Clearly the use of this technique should be limited and done only if your code requires such a thing



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# File 'lib/mcollective/rpc/client.rb', line 153

def new_request(action, data)
  callerid = PluginManager["security_plugin"].callerid

  raise 'callerid received from security plugin is not valid' unless PluginManager["security_plugin"].valid_callerid?(callerid)

  {:agent  => @agent,
   :action => action,
   :caller => callerid,
   :data   => data}
end

#options ⇒ Object

Provides a normal options hash like you would get from Optionparser



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# File 'lib/mcollective/rpc/client.rb', line 566

def options
  {:disctimeout => discovery_timeout,
   :timeout => @timeout,
   :verbose => @verbose,
   :filter => @filter,
   :collective => @collective,
   :output_format => @output_format,
   :ttl => @ttl,
   :discovery_method => @discovery_method,
   :discovery_options => @discovery_options,
   :force_display_mode => @force_display_mode,
   :config => @config,
   :publish_timeout => @publish_timeout,
   :threaded => @threaded}
end

#pick_nodes_from_discovered(count) ⇒ Object

Pick a number of nodes from the discovered nodes

The count should be a string that can be either just a number or a percentage like 10%

It will select nodes from the discovered list based on the rpclimitmethod configuration option which can be either :first or anything else

- :first would be a simple way to do a distance based
  selection
- anything else will just pick one at random
- if random chosen, and batch-seed set, then set srand
  for the generator, and reset afterwards



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# File 'lib/mcollective/rpc/client.rb', line 655

def pick_nodes_from_discovered(count)
  if count =~ /%$/
    pct = Integer((discover.size * (count.to_f / 100)))
    pct == 0 ? count = 1 : count = pct
  else
    count = Integer(count)
  end

  return discover if discover.size <= count

  result = []

  if @limit_method == :first
    return discover[0, count]
  else
    # we delete from the discovered list because we want
    # to be sure there is no chance that the same node will
    # be randomly picked twice.  So we have to clone the
    # discovered list else this method will only ever work
    # once per discovery cycle and not actually return the
    # right nodes.
    haystack = discover.clone

    if @limit_seed
      haystack.sort!
      srand(@limit_seed)
    end

    count.times do
      rnd = rand(haystack.size)
      result << haystack.delete_at(rnd)
    end

    # Reset random number generator to fresh seed
    # As our seed from options is most likely short
    srand if @limit_seed
  end

  [result].flatten
end

#process_results_with_block(action, resp, block, aggregate) ⇒ Object

process client requests by calling a block on each result in this mode we do not do anything fancy with the result objects and we raise exceptions if there are problems with the data



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# File 'lib/mcollective/rpc/client.rb', line 987

def process_results_with_block(action, resp, block, aggregate)
  @stats.node_responded(resp[:senderid])

  result = rpc_result_from_reply(@agent, action, resp)
  aggregate = aggregate_reply(result, aggregate) if aggregate

  @stats.ok if resp[:body][:statuscode] == 0
  @stats.fail if resp[:body][:statuscode] != 0
  @stats.time_block_execution :start

  case block.arity
    when 1
      block.call(resp)
    when 2
      block.call(resp, result)
  end

  @stats.time_block_execution :end

  return aggregate
end

#process_results_without_block(resp, action, aggregate) ⇒ Object

Handles result sets that has no block associated, sets fails and ok in the stats object and return a hash of the response to send to the caller



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# File 'lib/mcollective/rpc/client.rb', line 967

def process_results_without_block(resp, action, aggregate)
  @stats.node_responded(resp[:senderid])

  result = rpc_result_from_reply(@agent, action, resp)
  aggregate = aggregate_reply(result, aggregate) if aggregate

  if resp[:body][:statuscode] == 0 || resp[:body][:statuscode] == 1
    @stats.ok if resp[:body][:statuscode] == 0
    @stats.fail if resp[:body][:statuscode] == 1
  else
    @stats.fail
  end

  [result, aggregate]
end

#reset ⇒ Object

Resets various internal parts of the class, most importantly it clears out the cached discovery



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# File 'lib/mcollective/rpc/client.rb', line 452

def reset
  @discovered_agents = nil
end

#reset_filter ⇒ Object

Reet the filter to an empty one



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# File 'lib/mcollective/rpc/client.rb', line 457

def reset_filter
  @filter = Util.empty_filter
  agent_filter @agent
end

#rpc_result_from_reply(agent, action, reply) ⇒ Object 



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# File 'lib/mcollective/rpc/client.rb', line 717

def rpc_result_from_reply(agent, action, reply)
  Result.new(agent, action, {:sender => reply[:senderid], :statuscode => reply[:body][:statuscode],
                             :statusmsg => reply[:body][:statusmsg], :data => reply[:body][:data]})
end

#validate_request(action, args) ⇒ Object

For the provided arguments and action the input arguments get modified by supplying any defaults provided in the DDL for arguments that were not supplied in the request

We then pass the modified arguments to the DDL for validation



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# File 'lib/mcollective/rpc/client.rb', line 169

def validate_request(action, args)
  raise "No DDL found for agent %s cannot validate inputs" % @agent unless @ddl

  @ddl.set_default_input_arguments(action, args)
  @ddl.validate_rpc_request(action, args)
end