lib/arborist/monitor/snmp/disk.rb
author Mahlon E. Smith <mahlon@martini.nu>
Wed, 30 Aug 2017 13:55:02 -0700
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permissions -rw-r--r--
Use the new #node_properties method, convery from .rvmrc
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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 Disk capacity checks.
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# Returns all mounts with their current usage percentage in a "mount" attribute.
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#
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class Arborist::Monitor::SNMP::Disk
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	include Arborist::Monitor::SNMP
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	extend Loggability
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	log_to :arborist
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	# The OID that returns the system environment.
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	IDENTIFICATION_OID = '1.3.6.1.2.1.1.1.0'
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	# For net-snmp systems, ignore mount types that match
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	# this regular expression.  This includes null/union mounts
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	# and NFS, currently.
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	STORAGE_IGNORE = %r{25.3.9.(?:2|14)$}
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	# The OID that matches a local windows hard disk.  Anything else
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	# is a remote (SMB) mount.
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	WINDOWS_DEVICE = '1.3.6.1.2.1.25.2.1.4'
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	# OIDS required to pull disk information from net-snmp.
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	#
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	STORAGE_NET_SNMP = [
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		'1.3.6.1.4.1.2021.9.1.2', # paths
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		'1.3.6.1.2.1.25.3.8.1.4', # types
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		'1.3.6.1.4.1.2021.9.1.9'  # percents
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	]
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	# OIDS required to pull disk information from Windows.
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	#
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	STORAGE_WINDOWS = [
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		'1.3.6.1.2.1.25.2.3.1.2', # types
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		'1.3.6.1.2.1.25.2.3.1.3', # paths
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		'1.3.6.1.2.1.25.2.3.1.5', # totalsize
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		'1.3.6.1.2.1.25.2.3.1.6'  # usedsize
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	]
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	# Global defaults for instances of this monitor
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	#
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	DEFAULT_OPTIONS = {
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		error_at: 95, # in percent full
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		include:  [], # if non-empty, only these paths are included in checks
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		exclude:  []  # paths to exclude from checks
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	}
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	### This monitor is complex enough to require creating an instance from the caller.
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	### Provide a friendlier error message the class was provided to exec() directly.
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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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	### Create a new instance of this monitor.
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	###
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	def initialize( options=DEFAULT_OPTIONS )
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		options = DEFAULT_OPTIONS.merge( options || {} )
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		%i[ include exclude ].each do |opt|
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			options[ opt ] = Array( options[opt] )
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		end
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		options.each do |name, value|
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			self.public_send( "#{name.to_s}=", value )
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		end
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	end
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	# Set an error if mount points are above this percentage.
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	attr_accessor :error_at
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	# Only check these specific mount points.
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	attr_accessor :include
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	# Exclude these mount points (array of paths) from checks.
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	attr_accessor :exclude
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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 |snmp, host|
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			self.gather_disks( snmp, host )
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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 mount point usage for +host+ from an existing (and open)
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	#### +snmp+ connection.
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	###
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	def gather_disks( snmp, host )
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		self.log.debug "Getting disk information for %s" % [ host ]
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		errors  = []
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		results = {}
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		mounts  = self.get_disk_percentages( snmp )
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		config  = @identifiers[ host ].last || {}
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		includes = config[ 'include' ] || self.include
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		excludes = config[ 'exclude' ] || self.exclude
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		mounts.each_pair do |path, percentage|
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			next if excludes.include?( path )
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			next if ! includes.empty? && ! includes.include?( path )
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			if percentage >= ( config[ 'error_at' ] || self.error_at )
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				errors << "%s at %d%% capacity" % [ path, percentage ]
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			end
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		end
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		results[ :mounts ] = mounts
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		results[ :error ] = errors.join( ', ' ) unless errors.empty?
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		@results[ host ] = results
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	end
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	### Given a SNMP object, return a hash of:
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	###
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	###    device path => percentage full
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	###
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	def get_disk_percentages( snmp )
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		# Does this look like a windows system, or a net-snmp based one?
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		system_type = snmp.get( SNMP::ObjectId.new( IDENTIFICATION_OID ) ).varbind_list.first.value
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		disks = {}
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		# Windows has it's own MIBs.
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		#
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		if system_type =~ /windows/i
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			snmp.walk( STORAGE_WINDOWS ) do |list|
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				next unless list[0].value.to_s == WINDOWS_DEVICE
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				disks[ list[1].value.to_s ] = ( list[3].value.to_f / list[2].value.to_f ) * 100
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			end
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			return disks
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		end
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		# Everything else.
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		#
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		snmp.walk( STORAGE_NET_SNMP ) do |list|
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			mount = list[0].value.to_s
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			next if mount == 'noSuchInstance'
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			next if list[2].value.to_s == 'noSuchInstance'
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			used = list[2].value.to_i
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			unless list[1].value.to_s == 'noSuchInstance'
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				typeoid = list[1].value.join('.').to_s
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				next if typeoid =~ STORAGE_IGNORE
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			end
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			next if mount =~ /\/(?:dev|proc)$/
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			disks[ mount ] = used
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		end
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		return disks
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	end
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end # class Arborist::Monitor::SNMP::Disk
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