Module: Telemetry::Snmp::Client

Defined in:
lib/telemetry/snmp/client.rb

Class Method Summary collapse

Class Method Details

.connection(host) ⇒ Object 



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# File 'lib/telemetry/snmp/client.rb', line 21

def connection(host)
  return @connections[host.to_sym] if @connections.key? host.to_sym

  dataset = Telemetry::Snmp::Data::Model::Device.where(hostname: host).or(ip_address: host).first

  @connections[host.to_sym] = NETSNMP::Client.new(
    host: dataset.values[:hostname],
    port: dataset.values[:port],
    username: dataset.device_cred.values[:username],
    auth_password: dataset.device_cred.values[:auth_password],
    auth_protocol: dataset.device_cred.values[:auth_protocol].to_sym,
    priv_password: dataset.device_cred.values[:priv_password],
    priv_protocol: dataset.device_cred.values[:priv_protocol].to_sym,
    security_level: dataset.device_cred.values[:security_level].to_sym
  )
end

.grab_oid_metrics(hostname) ⇒ Object 



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# File 'lib/telemetry/snmp/client.rb', line 61

def grab_oid_metrics(hostname)
  device = Telemetry::Snmp::Data::Model::Device.where(hostname: hostname).or(ip_address: hostname).first
  @lines = []
  Telemetry::Snmp::Data::Model::OIDWalks.where(:active).each do |row|
    index = {}
    Telemetry::Snmp::Client.oid_walk(device.values[:hostname], row.values[:oid_index]).each do |hash|
      index[hash[:oid_code].delete_prefix("#{row.values[:oid_index]}.")] = hash[:value].gsub(%r{\\/}, '.')
    end

    timestamp = DateTime.now.strftime('%Q').to_i * 1000 * 1000
    Telemetry::Snmp::Client.oid_walk(device.values[:hostname], row.values[:oid_walk]).each do |walk|
      key = walk[:oid_code].split('.').last
      next if walk[:value].is_a? String
      next if walk[:value].nil?

      fields = {}
      fields[walk[:identifier]] = "#{walk[:value]}i"
      tags = {
        hostname: device.values[:hostname],
        interface: index[key],
        ip_address: device.values[:ip_address],
        zone: device.values[:zone],
        env: device.values[:environment],
        dc: device.values[:datacenter],
        influxdb_node_group: 'snmp'
      }

      line = Telemetry::Metrics::Parser.to_line_protocol(
        measurement: row.values[:measurement],
        fields: fields,
        tags: tags,
        timestamp: timestamp
      )

      @lines.push line
    end
  rescue StandardError => e
    Telemetry::Logger.error "#{e.class}: #{hostname}, #{e.message}"
  end

  @lines
end

.load_mibs ⇒ Object 



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# File 'lib/telemetry/snmp/client.rb', line 10

def load_mibs
  ENV['MIBDIRS'] = "#{__dir__}/mibs"
  NETSNMP::MIB.load_defaults
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-COMMON-MIB.my")
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-ENTITY-EXT-MIB.my")
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-GLOBAL-REG-MIB.my")
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-GLOBAL-TC-MIB.my")
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-LC-MIB.my")
  # NETSNMP::MIB.load("#{__dir__}/mibs/PAN-PRODUCT-MIB.my")
end

.oid_value(host, oid) ⇒ Object 



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# File 'lib/telemetry/snmp/client.rb', line 38

def oid_value(host, oid)
  connection(host).get(oid: oid)
rescue StandardError
  nil
end

.oid_walk(host, oid) ⇒ Object 



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# File 'lib/telemetry/snmp/client.rb', line 44

def oid_walk(host, oid)
  results = []
  connection(host).walk(oid: oid).each do |oid_code, value|
    hash = { oid_code: oid_code, value: value }
    begin
      ident = NETSNMP::MIB.identifier(oid_code)

      hash[:identifier] = ident.first
    rescue StandardError
      # literally do nothing
    end
    results.push hash
  end

  results
end