105 lines
2.7 KiB
Ruby
Executable File
105 lines
2.7 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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# Plugin to monitor Room Alert 11E environmental units.
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# Requires ruby and the ruby SNMP library.
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#
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# Written by Phil Gold <phil_g@pobox.com>.
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#
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# Usage: Copy or link into /etc/munin/node.d/. End word can be either
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# "temperature" or "humidity".
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#
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# Parameters:
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#
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# config (required)
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# autoconf (optional - used by munin-config)
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#
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# Config variables:
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#
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# units - DNS names of environmental units
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# community - Community to use to access the Room Alert unit
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# Defaults to 'public'.
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# variables of the form label_<unit>_<num>, where dots and dashes in the
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# unit names are replaced with underscores - labels for specific sensors
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# in the unit.
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# e.g. env.label_192_168_1_115_2 Main Unit
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#
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# Example config:
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#
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# [room_alert_*]
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# env.units unit1.example.com unit2.example.com
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# env.community private
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# env.label_unit1_example_com_2 Main Unit
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# env.label_unit1_example_com_3 Rack 2 Sensor
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require 'snmp'
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base_oid = 'enterprises.20916.1.3.1'
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case $0.match('[^_]+$')[0]
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when 'temperature'
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subchannel = 1
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name = 'temperature'
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label = '°C'
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letter = 't'
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when 'humidity'
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subchannel = 3
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name = 'humidity'
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label = '% Relative Humidity'
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letter = 'h'
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else
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exit 1
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end
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def is_vb_valid(vb, subchannel)
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(vb.name[-1] == 0 and vb.name[-2] == subchannel and vb.value > 1)
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end
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def field_name(unit, vb, letter)
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clean_unit = unit.gsub(/[.-]/, '_')
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sensor = vb.name[-3].to_s
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"#{clean_unit}_#{letter}#{sensor}"
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end
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def label(unit, vb)
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clean_unit = unit.gsub(/[.-]/, '_')
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sensor = vb.name[-3].to_s
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label = "#{unit} " + (ENV["label_#{clean_unit}_#{sensor}"] || "sensor #{sensor}")
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end
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units = (ENV['units'] || '').split(/\s+/)
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community = ENV['community'] || 'public'
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case ARGV[0]
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when 'autoconf'
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puts 'no'
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exit 0
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when 'config'
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puts "graph_title Room Alert 11E units (#{name} probes)"
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puts "graph_vlabel #{label}"
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puts 'graph_category sensors'
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puts 'graph_args --lower-limit 0 --upper-limit 100' if name == 'humidity'
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units.each do |unit|
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SNMP::Manager.open(Host: unit,
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Community: community,
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Version: :SNMPv1) do |manager|
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manager.walk(base_oid) do |vb|
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next unless is_vb_valid(vb, subchannel)
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puts "#{field_name(unit, vb, letter)}.label #{label(unit, vb)}"
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end
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end
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end
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exit 0
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end
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units.each do |unit|
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SNMP::Manager.open(Host: unit,
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Community: community,
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Version: :SNMPv1) do |manager|
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manager.walk(base_oid) do |vb|
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next unless is_vb_valid(vb, subchannel)
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puts "#{field_name(unit, vb, letter)}.value #{vb.value.to_f / 100}"
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end
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end
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end
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