Class | MCollective::Client |
In: |
lib/mcollective/client.rb
|
Parent: | Object |
Helpers for writing clients that can talk to agents, do discovery and so forth
discoverer | [RW] | |
options | [RW] | |
stats | [RW] |
# File lib/mcollective/client.rb, line 6 6: def initialize(configfile) 7: @config = Config.instance 8: @config.loadconfig(configfile) unless @config.configured 9: 10: @connection = PluginManager["connector_plugin"] 11: @security = PluginManager["security_plugin"] 12: 13: @security.initiated_by = :client 14: @options = nil 15: @subscriptions = {} 16: 17: @discoverer = Discovery.new(self) 18: @connection.connect 19: end
Returns the configured main collective if no specific collective is specified as options
# File lib/mcollective/client.rb, line 23 23: def collective 24: if @options[:collective].nil? 25: @config.main_collective 26: else 27: @options[:collective] 28: end 29: end
Disconnects cleanly from the middleware
# File lib/mcollective/client.rb, line 32 32: def disconnect 33: Log.debug("Disconnecting from the middleware") 34: @connection.disconnect 35: 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 115 115: def discover(filter, timeout, limit=0) 116: discovered = @discoverer.discover(filter, timeout, limit) 117: end
# File lib/mcollective/client.rb, line 177 177: def discovered_req(body, agent, options=false) 178: raise "Client#discovered_req has been removed, please port your agent and client to the SimpleRPC framework" 179: end
Prints out the stats returns from req and discovered_req in a nice way
# File lib/mcollective/client.rb, line 182 182: def display_stats(stats, options=false, caption="stomp call summary") 183: options = @options unless options 184: 185: if options[:verbose] 186: puts("\n---- #{caption} ----") 187: 188: if stats[:discovered] 189: puts(" Nodes: #{stats[:discovered]} / #{stats[:responses]}") 190: else 191: puts(" Nodes: #{stats[:responses]}") 192: end 193: 194: printf(" Start Time: %s\n", Time.at(stats[:starttime])) 195: printf(" Discovery Time: %.2fms\n", stats[:discoverytime] * 1000) 196: printf(" Agent Time: %.2fms\n", stats[:blocktime] * 1000) 197: printf(" Total Time: %.2fms\n", stats[:totaltime] * 1000) 198: 199: else 200: if stats[:discovered] 201: printf("\nFinished processing %d / %d hosts in %.2f ms\n\n", stats[:responses], stats[:discovered], stats[:blocktime] * 1000) 202: else 203: printf("\nFinished processing %d hosts in %.2f ms\n\n", stats[:responses], stats[:blocktime] * 1000) 204: end 205: end 206: 207: if stats[:noresponsefrom].size > 0 208: puts("\nNo response from:\n") 209: 210: stats[:noresponsefrom].each do |c| 211: puts if c % 4 == 1 212: printf("%30s", c) 213: end 214: 215: puts 216: end 217: 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 85 85: def receive(requestid = nil) 86: reply = nil 87: 88: begin 89: reply = @connection.receive 90: reply.type = :reply 91: reply.expected_msgid = requestid 92: 93: reply.decode! 94: 95: reply.payload[:senderid] = Digest::MD5.hexdigest(reply.payload[:senderid]) if ENV.include?("MCOLLECTIVE_ANON") 96: 97: raise(MsgDoesNotMatchRequestID, "Message reqid #{requestid} does not match our reqid #{reply.requestid}") unless reply.requestid == requestid 98: rescue SecurityValidationFailed => e 99: Log.warn("Ignoring a message that did not pass security validations") 100: retry 101: rescue MsgDoesNotMatchRequestID => e 102: Log.debug("Ignoring a message for some other client") 103: retry 104: end 105: 106: reply 107: 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 127 127: def req(body, agent=nil, options=false, waitfor=0) 128: if body.is_a?(Message) 129: agent = body.agent 130: waitfor = body.discovered_hosts.size || 0 131: @options = body.options 132: end 133: 134: @options = options if options 135: 136: stat = {:starttime => Time.now.to_f, :discoverytime => 0, :blocktime => 0, :totaltime => 0} 137: 138: timeout = @discoverer.discovery_timeout(@options[:timeout], @options[:filter]) 139: 140: STDOUT.sync = true 141: 142: hosts_responded = 0 143: reqid = nil 144: 145: begin 146: Log.debug("Publishing request to agent %s with timeout %d" % [agent, timeout]) 147: 148: Timeout.timeout(timeout) do 149: reqid = sendreq(body, agent, @options[:filter]) 150: 151: loop do 152: resp = receive(reqid) 153: 154: hosts_responded += 1 155: 156: yield(resp.payload) 157: 158: break if (waitfor != 0 && hosts_responded >= waitfor) 159: end 160: end 161: rescue Interrupt => e 162: rescue Timeout::Error => e 163: ensure 164: unsubscribe(agent, :reply) 165: end 166: 167: stat[:totaltime] = Time.now.to_f - stat[:starttime] 168: stat[:blocktime] = stat[:totaltime] - stat[:discoverytime] 169: stat[:responses] = hosts_responded 170: stat[:noresponsefrom] = [] 171: stat[:requestid] = reqid 172: 173: @stats = stat 174: return stat 175: 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 39 39: def sendreq(msg, agent, filter = {}) 40: if msg.is_a?(Message) 41: request = msg 42: agent = request.agent 43: else 44: ttl = @options[:ttl] || @config.ttl 45: request = Message.new(msg, nil, {:agent => agent, :type => :request, :collective => collective, :filter => filter, :ttl => ttl}) 46: request.reply_to = @options[:reply_to] if @options[:reply_to] 47: end 48: 49: request.encode! 50: 51: Log.debug("Sending request #{request.requestid} to the #{request.agent} agent with ttl #{request.ttl} in collective #{request.collective}") 52: 53: subscribe(agent, :reply) unless request.reply_to 54: 55: request.publish 56: 57: request.requestid 58: end
# File lib/mcollective/client.rb, line 60 60: def subscribe(agent, type) 61: unless @subscriptions.include?(agent) 62: subscription = Util.make_subscriptions(agent, type, collective) 63: Log.debug("Subscribing to #{type} target for agent #{agent}") 64: 65: Util.subscribe(subscription) 66: @subscriptions[agent] = 1 67: end 68: end
# File lib/mcollective/client.rb, line 70 70: def unsubscribe(agent, type) 71: if @subscriptions.include?(agent) 72: subscription = Util.make_subscriptions(agent, type, collective) 73: Log.debug("Unsubscribing #{type} target for #{agent}") 74: 75: Util.unsubscribe(subscription) 76: @subscriptions.delete(agent) 77: end 78: end