lib/arborist/monitor/snmp/disk.rb
author Mahlon E. Smith <mahlon@martini.nu>
Wed, 04 Apr 2018 12:44:20 -0700
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permissions -rw-r--r--
Tabs -> Spaces
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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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# Disk capacity checks.
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#
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# Sets all configured mounts with their current usage percentage
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# in an attribute named "mounts".
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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 Configurability, Loggability
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	log_to :arborist_snmp
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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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		path: '1.3.6.1.4.1.2021.9.1.2',
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		percent: '1.3.6.1.4.1.2021.9.1.9',
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		type: '1.3.6.1.2.1.25.3.8.1.4'
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	}
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	# The OID that matches a local windows hard disk.
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	#
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	WINDOWS_DEVICES = [
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		'1.3.6.1.2.1.25.2.1.4', # local disk
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		'1.3.6.1.2.1.25.2.1.7'  # removables, but we have to include them for iscsi mounts
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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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		type: '1.3.6.1.2.1.25.2.3.1.2',
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		path: '1.3.6.1.2.1.25.2.3.1.3',
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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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	# The fallback warning capacity.
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	WARN_AT = 90
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	# Configurability API
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	#
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	configurability( 'arborist.snmp.disk' ) do
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		# What percentage qualifies as a warning
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		setting :warn_at, default: WARN_AT
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		# If non-empty, only these paths are included in checks.
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		#
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		setting :include do |val|
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			if val
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				mounts = Array( val ).map{|m| Regexp.new(m) }
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				Regexp.union( mounts )
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			end
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		end
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		# Paths to exclude from checks
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		#
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		setting :exclude,
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			default: [ '^/dev(/.+)?$', '^/net(/.+)?$', '^/proc$', '^/run$', '^/sys/' ] do |val|
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			mounts = Array( val ).map{|m| Regexp.new(m) }
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			Regexp.union( mounts )
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		end
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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_disks( 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 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( host, snmp )
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		mounts  =  self.system =~ /windows\s+/i ? self.windows_disks( snmp ) : self.unix_disks( snmp )
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		config  = self.identifiers[ host ].last || {}
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		warn_at = config[ 'warn_at' ] || self.class.warn_at
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		includes = self.format_mounts( config, 'include' ) || self.class.include
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		excludes = self.format_mounts( config, 'exclude' ) || self.class.exclude
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		mounts.reject! do |path, percentage|
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			excludes.match( path ) || ( includes && ! includes.match( path ) )
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		end
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		errors   = []
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		warnings = []
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		mounts.each_pair do |path, percentage|
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			warn = begin
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			  if warn_at.is_a?( Hash )
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				  warn_at[ path ] || WARN_AT
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			  else
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				  warn_at
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			  end
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			end
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			self.log.debug "%s:%s -> at %d, warn at %d" % [ host, path, percentage, warn ]
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			if percentage >= warn.to_i
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				if percentage >= 100
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					errors << "%s at %d%% capacity" % [ path, percentage ]
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				else
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					warnings << "%s at %d%% capacity" % [ path, percentage ]
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				end
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			end
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		end
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		self.results[ host ] = { mounts: mounts }
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		self.results[ host ][ :error ]   = errors.join(', ')   unless errors.empty?
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		self.results[ host ][ :warning ] = warnings.join(', ') unless warnings.empty?
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	end
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	### Return a single regexp for the 'include' or 'exclude' section of
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	### resource node's +config+, or nil if nonexistent.
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	###
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	def format_mounts( config, section )
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		list = config[ section ] || return
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		mounts = Array( list ).map{|m| Regexp.new(m) }
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		return Regexp.union( mounts )
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	end
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	### Fetch information for Windows systems.
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	###
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	def windows_disks( snmp )
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		raw = snmp.get_bulk([
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			STORAGE_WINDOWS[:path],
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			STORAGE_WINDOWS[:type],
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			STORAGE_WINDOWS[:total],
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			STORAGE_WINDOWS[:used]
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		]).varbinds.map( &:value )
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		disks = {}
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		raw.each_slice( 4 ) do |device|
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			next unless device[1].respond_to?( :oid ) && WINDOWS_DEVICES.include?( device[1].oid )
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			next if device[2].zero?
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			disks[ device[0] ] = (( device[3].to_f / device[2] ) * 100).round( 1 )
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		end
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		return disks
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	end
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	### Fetch information for Unix/MacOS systems.
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	###
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	def unix_disks( snmp )
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		raw = snmp.get_bulk([
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			STORAGE_NET_SNMP[:path],
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			STORAGE_NET_SNMP[:percent] ]).varbinds.map( &:value )
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		return Hash[ *raw ]
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	end
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end # class Arborist::Monitor::SNMP::Disk
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