# -*- ruby -*-

# vim: set noet nosta sw=4 ts=4 :

require 'arborist/monitor/snmp' unless defined?( Arborist::Monitor::SNMP )

# SNMP running process checks.

#

# This only checks running userland processes.

#

class Arborist::Monitor::SNMP::Process

	include Arborist::Monitor::SNMP

	extend Configurability, Loggability

	log_to :arborist_snmp

	# OIDS for discovering running processes.

	# Of course, Windows does it slightly differently.

	#

	PROCESS = {

		netsnmp: {

			list: '1.3.6.1.2.1.25.4.2.1.4',

			args: '1.3.6.1.2.1.25.4.2.1.5'

		},

		windows: {

			list: '1.3.6.1.2.1.25.4.2.1.2',

			path: '1.3.6.1.2.1.25.4.2.1.4',

			args: '1.3.6.1.2.1.25.4.2.1.5'

		}

	}

	# Global defaults for instances of this monitor

	#

	configurability( 'arborist.snmp.processes' ) do

		# Default list of processes to check for

		setting :check, default: [] do |val|

			Array( val )

		end

	end

	### Return the properties used by this monitor.

	###

	def self::node_properties

		return USED_PROPERTIES

	end

	### Class #run creates a new instance and immediately runs it.

	###

	def self::run( nodes )

		return new.run( nodes )

	end

	### Perform the monitoring checks.

	###

	def run( nodes )

		super do |host, snmp|

			self.gather_processlist( host, snmp )

		end

	end

	#########

	protected

	#########

	### Collect running processes on +host+ from an existing (and open)

	#### +snmp+ connection.

	###

	def gather_processlist( host, snmp )

		config = self.identifiers[ host ].last || {}

		errors = []

		procs  = self.system =~ /windows\s+/i ? self.get_windows( snmp ) : self.get_procs( snmp )

		self.log.debug "Running processes for host: %s: %p" % [ host, procs ]

		self.results[ host ] = { count: procs.size }

		# Check against what is running.

		#

		Array( config['processes'] || self.class.check ).each do |process|

			process_r = Regexp.new( process )

			found = procs.find{|p| p.match(process_r) }

			errors << "'%s' is not running" % [ process ] unless found

		end

		self.results[ host ][ :error ] = errors.join( ', ' ) unless errors.empty?

	end

	### Parse OIDS and return an Array of running processes.

	### Windows specific behaviors.

	###

	def get_windows( snmp )

		oids = [ PROCESS[:windows][:path], PROCESS[:windows][:list], PROCESS[:windows][:args] ]

		return snmp.walk( oids ).each_slice( 3 ). each_with_object( [] ) do |vals, acc|

			path, process, args = vals[0][1], vals[1][1], vals[2][1]

			next if path.empty?

			process = "%s%s" % [ path, process ]

			process << " %s" % [ args ] unless args.empty?

			acc << process

		end

	end

	### Parse OIDS and return an Array of running processes.

	###

	def get_procs( snmp )

		oids = [ PROCESS[:netsnmp][:list], PROCESS[:netsnmp][:args] ]

		return snmp.walk( oids ).each_slice( 2 ).each_with_object( [] ) do |vals, acc|

			process, args = vals[0][1], vals[1][1]

			next if process.empty?

			process << " %s" % [ args ] unless args.empty?

			acc << process

		end

	end

end # class Arborist::Monitor::SNMP::Process