Helpers for writing clients that can talk to agents, do discovery and so forth
Returns the configured main collective if no specific collective is specified as options
# File lib/mcollective/client.rb, line 22 def collective if @options[:collective].nil? @config.main_collective else @options[:collective] end end
Disconnects cleanly from the middleware
# File lib/mcollective/client.rb, line 31 def disconnect Log.debug("Disconnecting from the middleware") @connection.disconnect end
Performs a discovery of nodes matching the filter passed returns an array of nodes
An integer limit can be supplied this will have the effect of the discovery being cancelled soon as it reached the requested limit of hosts
# File lib/mcollective/client.rb, line 114 def discover(filter, timeout, limit=0) raise "Limit has to be an integer" unless limit.is_a?(Fixnum) begin hosts = [] Timeout.timeout(timeout) do reqid = sendreq("ping", "discovery", filter) Log.debug("Waiting #{timeout} seconds for discovery replies to request #{reqid}") loop do reply = receive(reqid) Log.debug("Got discovery reply from #{reply.payload[:senderid]}") hosts << reply.payload[:senderid] return hosts if limit > 0 && hosts.size == limit end end rescue Timeout::Error => e rescue Exception => e raise ensure unsubscribe("discovery", :reply) end hosts.sort end
Performs a discovery and then send a request, performs the passed block for each response
times = discovered_req("status", "mcollectived", options, client) {|resp| pp resp }
It returns a hash of times and timeouts for discovery and total run is taken from the options hash which in turn is generally built using MCollective::Optionparser
# File lib/mcollective/client.rb, line 201 def discovered_req(body, agent, options=false) stat = {:starttime => Time.now.to_f, :discoverytime => 0, :blocktime => 0, :totaltime => 0} options = @options unless options STDOUT.sync = true print("Determining the amount of hosts matching filter for #{options[:disctimeout]} seconds .... ") begin discovered_hosts = discover(options[:filter], options[:disctimeout]) discovered = discovered_hosts.size hosts_responded = [] hosts_not_responded = discovered_hosts stat[:discoverytime] = Time.now.to_f - stat[:starttime] puts("#{discovered}\n\n") rescue Interrupt puts("Discovery interrupted.") exit! end raise("No matching clients found") if discovered == 0 begin Timeout.timeout(options[:timeout]) do reqid = sendreq(body, agent, options[:filter]) (1..discovered).each do |c| resp = receive(reqid) hosts_responded << resp.payload[:senderid] hosts_not_responded.delete(resp.payload[:senderid]) if hosts_not_responded.include?(resp.payload[:senderid]) yield(resp.payload) end end rescue Interrupt => e rescue Timeout::Error => e end stat[:totaltime] = Time.now.to_f - stat[:starttime] stat[:blocktime] = stat[:totaltime] - stat[:discoverytime] stat[:responses] = hosts_responded.size stat[:responsesfrom] = hosts_responded stat[:noresponsefrom] = hosts_not_responded stat[:discovered] = discovered @stats = stat return stat end
Prints out the stats returns from req and discovered_req in a nice way
# File lib/mcollective/client.rb, line 255 def display_stats(stats, options=false, caption="stomp call summary") options = @options unless options if options[:verbose] puts("\n---- #{caption} ----") if stats[:discovered] puts(" Nodes: #{stats[:discovered]} / #{stats[:responses]}") else puts(" Nodes: #{stats[:responses]}") end printf(" Start Time: %s\n", Time.at(stats[:starttime])) printf(" Discovery Time: %.2fms\n", stats[:discoverytime] * 1000) printf(" Agent Time: %.2fms\n", stats[:blocktime] * 1000) printf(" Total Time: %.2fms\n", stats[:totaltime] * 1000) else if stats[:discovered] printf("\nFinished processing %d / %d hosts in %.2f ms\n\n", stats[:responses], stats[:discovered], stats[:blocktime] * 1000) else printf("\nFinished processing %d hosts in %.2f ms\n\n", stats[:responses], stats[:blocktime] * 1000) end end if stats[:noresponsefrom].size > 0 puts("\nNo response from:\n") stats[:noresponsefrom].each do |c| puts if c % 4 == 1 printf("%30s", c) end puts end end
Blocking call that waits for ever for a message to arrive.
If you give it a requestid this means you’ve previously send a request with that ID and now you just want replies that matches that id, in that case the current connection will just ignore all messages not directed at it and keep waiting for more till it finds a matching message.
# File lib/mcollective/client.rb, line 84 def receive(requestid = nil) reply = nil begin reply = @connection.receive reply.type = :reply reply.expected_msgid = requestid reply.decode! reply.payload[:senderid] = Digest::MD5.hexdigest(reply.payload[:senderid]) if ENV.include?("MCOLLECTIVE_ANON") raise(MsgDoesNotMatchRequestID, "Message reqid #{requestid} does not match our reqid #{reply.requestid}") unless reply.requestid == requestid rescue SecurityValidationFailed => e Log.warn("Ignoring a message that did not pass security validations") retry rescue MsgDoesNotMatchRequestID => e Log.debug("Ignoring a message for some other client") retry end reply end
Send a request, performs the passed block for each response
times = req(“status”, “mcollectived”, options, client) {|resp|
pp resp
}
It returns a hash of times and timeouts for discovery and total run is taken from the options hash which in turn is generally built using MCollective::Optionparser
# File lib/mcollective/client.rb, line 149 def req(body, agent=nil, options=false, waitfor=0) if body.is_a?(Message) agent = body.agent options = body.options waitfor = body.discovered_hosts.size || 0 end stat = {:starttime => Time.now.to_f, :discoverytime => 0, :blocktime => 0, :totaltime => 0} options = @options unless options STDOUT.sync = true hosts_responded = 0 begin Timeout.timeout(options[:timeout]) do reqid = sendreq(body, agent, options[:filter]) loop do resp = receive(reqid) hosts_responded += 1 yield(resp.payload) break if (waitfor != 0 && hosts_responded >= waitfor) end end rescue Interrupt => e rescue Timeout::Error => e ensure unsubscribe(agent, :reply) end stat[:totaltime] = Time.now.to_f - stat[:starttime] stat[:blocktime] = stat[:totaltime] - stat[:discoverytime] stat[:responses] = hosts_responded stat[:noresponsefrom] = [] @stats = stat return stat end
Sends a request and returns the generated request id, doesn’t wait for responses and doesn’t execute any passed in code blocks for responses
# File lib/mcollective/client.rb, line 38 def sendreq(msg, agent, filter = {}) if msg.is_a?(Message) request = msg agent = request.agent else ttl = @options[:ttl] || @config.ttl request = Message.new(msg, nil, {:agent => agent, :type => :request, :collective => collective, :filter => filter, :ttl => ttl}) request.reply_to = @options[:reply_to] if @options[:reply_to] end request.encode! Log.debug("Sending request #{request.requestid} to the #{request.agent} agent with ttl #{request.ttl} in collective #{request.collective}") subscribe(agent, :reply) request.publish request.requestid end
# File lib/mcollective/client.rb, line 59 def subscribe(agent, type) unless @subscriptions.include?(agent) subscription = Util.make_subscriptions(agent, type, collective) Log.debug("Subscribing to #{type} target for agent #{agent}") Util.subscribe(subscription) @subscriptions[agent] = 1 end end
# File lib/mcollective/client.rb, line 69 def unsubscribe(agent, type) if @subscriptions.include?(agent) subscription = Util.make_subscriptions(agent, type, collective) Log.debug("Unsubscribing #{type} target for #{agent}") Util.unsubscribe(subscription) @subscriptions.delete(agent) end end
# File lib/mcollective/client.rb, line 6 def initialize(configfile) @config = Config.instance @config.loadconfig(configfile) unless @config.configured @connection = PluginManager["connector_plugin"] @security = PluginManager["security_plugin"] @security.initiated_by = :client @options = nil @subscriptions = {} @connection.connect end
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