Class: MCollective::RPC::Client

### Home Classes Methods

### In Files

- lib/mcollective/rpc/client.rb

### Parent

Object

### Methods

- ::new
- #agent_filter
- #aggregate_reply
- #batch_size=
- #batch_sleep_time=
- #call_agent
- #call_agent_batched
- #class_filter
- #collective=
- #compound_filter
- #custom_request
- #disconnect
- #discover
- #discovery_method=
- #discovery_options=
- #discovery_timeout
- #fact_filter
- #fire_and_forget_request
- #help
- #identity_filter
- #limit_method=
- #limit_targets=
- #load_aggregate_functions
- #method_missing
- #new_request
- #options
- #pick_nodes_from_discovered
- #process_results_with_block
- #process_results_without_block
- #reset
- #reset_filter
- #rpc_result_from_reply

### Files

- COPYING
- README
- Rakefile
- PLACEHOLDER
- PLACEHOLDER

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# MCollective::RPC::Client

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.

### Attributes

agent[R]
batch_mode[R]
batch_size[R]
batch_sleep_time[R]
client[R]
config[RW]
ddl[R]
discovery_method[R]
discovery_options[R]
filter[RW]
limit_method[R]
limit_seed[R]
limit_targets[R]
output_format[R]
progress[RW]
reply_to[RW]
stats[R]
timeout[RW]
ttl[RW]
verbose[RW]

### Public Instance Methods

agent_filter(agent) click to toggle source

Sets the agent filter

    # File lib/mcollective/rpc/client.rb, line 379
    def agent_filter(agent)
      @filter["agent"] << agent
      @filter["agent"].compact!
      reset
    end

aggregate_reply(reply, aggregate) click to toggle source

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

batch_size=(limit) click to toggle source

Sets the batch size, if the size is set to 0 that will disable batch mode

    # File lib/mcollective/rpc/client.rb, line 576
    def batch_size=(limit)
      raise "Can only set batch size if direct addressing is supported" unless Config.instance.direct_addressing

      @batch_size = Integer(limit)
      @batch_mode = @batch_size > 0
    end

batch_sleep_time=(time) click to toggle source

    # File lib/mcollective/rpc/client.rb, line 583
    def batch_sleep_time=(time)
      raise "Can only set batch sleep time if direct addressing is supported" unless Config.instance.direct_addressing

      @batch_sleep_time = Float(time)
    end

call_agent(action, args, opts, disc=:auto, &block) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 782
    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

        @stats.aggregate_summary = aggregate.summarize 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) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 698
    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

      batch_size = Integer(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

        @stats.requestid = nil

        discovered.in_groups_of(batch_size) do |hosts, last_batch|
          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

          @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]

          sleep sleep_time unless last_batch
        end

        @stats.aggregate_summary = aggregate.summarize 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) click to toggle source

Sets the class filter

    # File lib/mcollective/rpc/client.rb, line 355
    def class_filter(klass)
      @filter["cf_class"] << klass
      @filter["cf_class"].compact!
      reset
    end

collective=(c) click to toggle source

Sets the collective we are communicating with

    # File lib/mcollective/rpc/client.rb, line 541
    def collective=(c)
      raise "Unknown collective #{c}" unless Config.instance.collectives.include?(c)

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

compound_filter(filter) click to toggle source

Set a compound filter

    # File lib/mcollective/rpc/client.rb, line 393
    def compound_filter(filter)
      @filter["compound"] <<  Matcher.create_compound_callstack(filter)
      reset
    end

custom_request(action, args, expected_agents, filter = {}, &block) click to toggle source

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”], {:identity => “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

    # File lib/mcollective/rpc/client.rb, line 282
    def custom_request(action, args, expected_agents, filter = {}, &block)
      @ddl.validate_rpc_request(action, args) if @ddl

      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() click to toggle source

Disconnects cleanly from the middleware

    # File lib/mcollective/rpc/client.rb, line 115
    def disconnect
      @client.disconnect
    end

discover(flags={}) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 425
    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

        # 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
        elsif 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

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

        # 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])

        actual_timeout = options[:disctimeout] + @client.timeout_for_compound_filter(options[:filter]["compound"])
        if actual_timeout > 0
          @stderr.print("Discovering hosts using the %s method for %d second(s) .... " % [@client.discoverer.discovery_method, actual_timeout]) if verbose
        else
          @stderr.print("Discovering hosts using the %s method .... " % [@client.discoverer.discovery_method]) if verbose
        end

        @client.options = options

        # 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
        if @limit_method == :first and @limit_targets.is_a?(Fixnum)
          @discovered_agents = @client.discover(@filter, options[:disctimeout], @limit_targets)
        else
          @discovered_agents = @client.discover(@filter, options[:disctimeout])
        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_method=(method) click to toggle source

    # File lib/mcollective/rpc/client.rb, line 335
    def discovery_method=(method)
      @discovery_method = method

      if @initial_options[:discovery_options]
        @discovery_options = @initial_options[:discovery_options]
      else
        @discovery_options.clear
      end

      @client.options = options
      @discovery_timeout = discovery_timeout
      reset
    end

discovery_options=(options) click to toggle source

    # File lib/mcollective/rpc/client.rb, line 349
    def discovery_options=(options)
      @discovery_options = [options].flatten
      reset
    end

discovery_timeout() click to toggle source

    # File lib/mcollective/rpc/client.rb, line 330
    def discovery_timeout
      return @initial_options[:disctimeout] if @initial_options[:disctimeout]
      return @client.discoverer.ddl.meta[:timeout]
    end

fact_filter(fact, value=nil, operator="=") click to toggle source

Sets the fact filter

    # File lib/mcollective/rpc/client.rb, line 362
    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"] << parsed unless parsed == false
      else
        parsed = Util.parse_fact_string("#{fact}#{operator}#{value}")
        @filter["fact"] << parsed unless parsed == false
      end

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

fire_and_forget_request(action, args, filter=nil) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 678
    def fire_and_forget_request(action, args, filter=nil)
      @ddl.validate_rpc_request(action, args) if @ddl

      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

      return @client.sendreq(message, nil)
    end

help(template) click to toggle source

Returns help for an agent if a DDL was found

    # File lib/mcollective/rpc/client.rb, line 120
    def help(template)
      if @ddl
        @ddl.help(template)
      else
        return "Can't find DDL for agent '#{@agent}'"
      end
    end

identity_filter(identity) click to toggle source

Sets the identity filter

    # File lib/mcollective/rpc/client.rb, line 386
    def identity_filter(identity)
      @filter["identity"] << identity
      @filter["identity"].compact!
      reset
    end

limit_method=(method) click to toggle source

Sets and sanity check the limit_method variable used to determine how to limit targets if limit_targets is set

    # File lib/mcollective/rpc/client.rb, line 567
    def limit_method=(method)
      method = method.to_sym unless method.is_a?(Symbol)

      raise "Unknown limit method #{method} must be :random or :first" unless [:random, :first].include?(method)

      @limit_method = method
    end

limit_targets=(limit) click to toggle source

Sets and sanity checks the limit_targets variable used to restrict how many nodes we’ll target

    # File lib/mcollective/rpc/client.rb, line 551
    def limit_targets=(limit)
      if limit.is_a?(String)
        raise "Invalid limit specified: #{limit} valid limits are /^\d+%*$/" unless limit =~ /^\d+%*$/

        begin
          @limit_targets = Integer(limit)
        rescue
          @limit_targets = limit
        end
      else
        @limit_targets = Integer(limit)
      end
    end

load_aggregate_functions(action, ddl) click to toggle source

    # File lib/mcollective/rpc/client.rb, line 644
    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

method_missing(method_name, *args, &block) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 217
    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

      @ddl.validate_rpc_request(action, args) if @ddl

      # 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 = (batch_mode && Integer(batch_size) > 0)

      # 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

new_request(action, data) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 147
    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() click to toggle source

Provides a normal options hash like you would get from Optionparser

    # File lib/mcollective/rpc/client.rb, line 526
    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}
    end

pick_nodes_from_discovered(count) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 603
    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) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 881
    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

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

        case resp[:body][:statuscode]
          when 2
            raise UnknownRPCAction, resp[:body][:statusmsg]
          when 3
            raise MissingRPCData, resp[:body][:statusmsg]
          when 4
            raise InvalidRPCData, resp[:body][:statusmsg]
          when 5
            raise UnknownRPCError, resp[:body][:statusmsg]
        end
      end

      return aggregate
    end

process_results_without_block(resp, action, aggregate) click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 861
    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() click to toggle source

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

    # File lib/mcollective/rpc/client.rb, line 400
    def reset
      @discovered_agents = nil
    end

reset_filter() click to toggle source

Reet the filter to an empty one

    # File lib/mcollective/rpc/client.rb, line 405
    def reset_filter
      @filter = Util.empty_filter
      agent_filter @agent
    end

rpc_result_from_reply(agent, action, reply) click to toggle source

    # File lib/mcollective/rpc/client.rb, line 665
    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

### Public Class Methods

new(agent, flags = {}) click to toggle source

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

    # 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
      @stats = Stats.new
      @agent = agent
      @timeout = initial_options[:timeout] || 5
      @verbose = initial_options[:verbose]
      @filter = initial_options[:filter]
      @config = initial_options[:config]
      @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]
      @discovery_options = initial_options[:discovery_options] || []
      @force_display_mode = initial_options[:force_display_mode] || false

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

      agent_filter agent

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

      @discovery_timeout = discovery_timeout

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

      # 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
      begin
        @ddl = DDL.new(agent)
        @stats.ddl = @ddl
        @timeout = @ddl.meta[:timeout] + @discovery_timeout if @timeout == 5
      rescue Exception => e
        Log.debug("Could not find DDL: #{e}")
        @ddl = nil
      end

      # 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

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