lib/arborist/monitor/snmp/memory.rb
author Mahlon E. Smith <mahlon@martini.nu>
Sat, 01 Aug 2020 14:17:50 -0700
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# -*- ruby -*-
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# vim: set noet nosta sw=4 ts=4 :
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require 'arborist/monitor/snmp' unless defined?( Arborist::Monitor::SNMP )
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# SNMP memory and swap utilization checks.
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#
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# Set 'usage' and 'available' keys as properties, in percentage/GBs,
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# respectively.
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#
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# By default, doesn't warn on memory usage, only swap, since
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# that's more indicitive of a problem.  You can still set the
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# 'physical_warn_at' key to force warnings on ram usage, for embedded
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# systems or other similar things without virtual memory.
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#
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class Arborist::Monitor::SNMP::Memory
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	include Arborist::Monitor::SNMP
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	extend Configurability, Loggability
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	log_to :arborist_snmp
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	# OIDS for discovering memory usage.
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	#
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	MEMORY = {
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		total:  '1.3.6.1.4.1.2021.4.5.0',
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		avail: '1.3.6.1.4.1.2021.4.6.0',
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		windows: {
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			label: '1.3.6.1.2.1.25.2.3.1.3',
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			units: '1.3.6.1.2.1.25.2.3.1.4',
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			total: '1.3.6.1.2.1.25.2.3.1.5',
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			used:  '1.3.6.1.2.1.25.2.3.1.6'
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		}
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	}
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	# OIDS for discovering swap usage.
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	#
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	SWAP = {
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		total: '1.3.6.1.4.1.2021.4.3.0',
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		avail: '1.3.6.1.4.1.2021.4.4.0'
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	}
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	# Global defaults for instances of this monitor
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	#
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	configurability( 'arborist.snmp.memory' ) do
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		# What memory usage percentage qualifies as a warning
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		setting :physical_warn_at, default: nil
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		# What swap usage percentage qualifies as a warning
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		setting :swap_warn_at, default: 60
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	end
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	### Return the properties used by this monitor.
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	###
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	def self::node_properties
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		return USED_PROPERTIES
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	end
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	### Class #run creates a new instance and immediately runs it.
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	###
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	def self::run( nodes )
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		return new.run( nodes )
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	end
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	### Perform the monitoring checks.
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	###
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	def run( nodes )
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		super do |host, snmp|
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			self.gather_memory( host, snmp )
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		end
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	end
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	#########
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	protected
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	#########
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	### Collect available memory information for +host+ from an existing
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	### (and open) +snmp+ connection.
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	###
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	def gather_memory( host, snmp )
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		info = self.system =~ /windows\s+/i ? self.get_windows( snmp ) : self.get_mem( snmp )
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		config           = self.identifiers[ host ].last['config'] || {}
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		physical_warn_at = config[ 'physical_warn_at' ] || self.class.physical_warn_at
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		swap_warn_at     = config[ 'swap_warn_at' ] || self.class.swap_warn_at
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		self.log.debug "Memory data on %s: %p" % [ host, info ]
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		memory, swap = info[:memory], info[:swap]
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		self.results[ host ] = { memory: memory, swap: swap }
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		memusage = memory[ :usage ].to_i
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		if physical_warn_at && memusage >= physical_warn_at
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			self.results[ host ][ :warning ] = "%0.1f memory utilization exceeds %0.1f percent" % [
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				memusage,
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				physical_warn_at
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			]
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		end
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		swapusage = swap[ :usage ].to_i
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		if swapusage >= swap_warn_at
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			self.results[ host ][ :warning ] = "%0.1f swap utilization exceeds %0.1f percent" % [
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				swapusage,
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				swap_warn_at
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			]
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		end
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	end
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	### Return a hash of usage percentage in use, and free mem in
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	### megs.
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	###
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	def get_mem( snmp )
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		info  = {}
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		info[ :memory ] = self.calc_memory( snmp, MEMORY )
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		info[ :swap ]   = self.calc_memory( snmp, SWAP )
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		return info
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	end
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	### Windows appends virtual and physical memory onto the last two items
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	### of the storage iterator, because that made sense in someone's mind.
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	### Walk the whole oid tree, and get the values we're after, return
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	### a hash of usage percentage in use and free mem in megs.
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	###
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	def get_windows( snmp )
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		info  = { memory: {}, swap: {} }
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		mem_idx, swap_idx = nil
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		snmp.walk( oid: MEMORY[:windows][:label] ).each_with_index do |(_, val), i|
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			mem_idx  = i + 1 if val =~ /physical memory/i
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			swap_idx = i + 1 if val =~ /virtual memory/i
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		end
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		return info unless mem_idx
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		info[ :memory ] = self.calc_windows_memory( snmp, mem_idx )
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		info[ :swap ]   = self.calc_windows_memory( snmp, swap_idx )
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		return info
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	end
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	### Format usage and available amount, given an OID hash.
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	###
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	def calc_memory( snmp, oids )
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		info = { usage: 0, available: 0 }
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		avail = snmp.get( oid: oids[:avail] ).to_f
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		total = snmp.get( oid: oids[:total] ).to_f
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		used  = total - avail
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		return info if avail.zero?
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		info[ :usage ]     = (( used / total ) * 100 ).round( 2 )
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		info[ :available ] = (( total - used ) / 1024 ).round( 2 )
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		return info
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	end
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	### Format usage and available amount for windows.
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	###
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	def calc_windows_memory( snmp, idx)
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		info = { usage: 0, available: 0 }
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		return info unless idx
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		units = snmp.get( oid: MEMORY[:windows][:units] + ".#{idx}" )
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		total = snmp.get( oid: MEMORY[:windows][:total] + ".#{idx}" ).to_f * units
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		used  = snmp.get( oid: MEMORY[:windows][:used] + ".#{idx}" ).to_f * units
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		info[ :usage ]     = (( used / total ) * 100 ).round( 2 )
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		info[ :available ] = (( total - used ) / 1024 / 1024 ).round( 2 )
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		return info
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	end
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end # class Arborist::Monitor::SNMP::Memory
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