Class: Cisco::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/cisco_node_utils/node.rb

Overview

class Cisco::Node Singleton representing the network node (switch/router) that is running this code. The singleton is lazily instantiated, meaning that it doesn’t exist until some client requests it (with Node.instance())

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Node

Returns a new instance of Node.



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# File 'lib/cisco_node_utils/node.rb', line 158

def initialize
  @client = Cisco::Client.create
  @cmd_ref = nil
  @cmd_ref = CommandReference.new(product:      product_id,
                                  platform:     @client.platform,
                                  data_formats: @client.data_formats)
  cache_flush
end

Instance Attribute Details

#client ⇒ Object (readonly)

Here and below are implementation details and private APIs that most providers shouldn’t need to know about or use.



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# File 'lib/cisco_node_utils/node.rb', line 152

def client
  @client
end

#cmd_ref ⇒ Object (readonly)

Here and below are implementation details and private APIs that most providers shouldn’t need to know about or use.



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# File 'lib/cisco_node_utils/node.rb', line 152

def cmd_ref
  @cmd_ref
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/cisco_node_utils/node.rb', line 154

def self.instance
  @instance ||= new
end

Instance Method Details

#boot ⇒ String

Returns such as “bootflash:///n3000-uk9-kickstart.6.0.2.U5.0.941.bin”.

Returns:

  • (String) —

    such as “bootflash:///n3000-uk9-kickstart.6.0.2.U5.0.941.bin”



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# File 'lib/cisco_node_utils/node.rb', line 295

def boot
  config_get('show_version', 'boot_image')
end

#cache_auto=(enable) ⇒ Object 



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# File 'lib/cisco_node_utils/node.rb', line 187

def cache_auto=(enable)
  @client.cache_auto = enable
end

#cache_auto? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cisco_node_utils/node.rb', line 183

def cache_auto?
  @client.cache_auto?
end

#cache_enable=(enable) ⇒ Object 



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# File 'lib/cisco_node_utils/node.rb', line 179

def cache_enable=(enable)
  @client.cache_enable = enable
end

#cache_enable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cisco_node_utils/node.rb', line 175

def cache_enable?
  @client.cache_enable?
end

#cache_flush ⇒ Object

Clear the cache of CLI output results.

If cache_auto is true (default) then this will be performed automatically whenever a config_set() is called, but providers may also call this to explicitly force the cache to be cleared.



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# File 'lib/cisco_node_utils/node.rb', line 145

def cache_flush
  @client.cache_flush
end

#config_get(feature, property, *args) ⇒ String, ...

Convenience wrapper for get() Uses CommandReference to look up the given show command and key of interest, executes that command, and returns the value corresponding to that key.

Examples:

config_get(“show_version”, “system_image”)

config_get(“ospf”, “router_id”,

{name: "green", vrf: "one"})

Parameters:

  • feature (String)
  • name (String)

Returns:

  • (String, Hash, Array)

Raises:

  • (IndexError) —

    if the given (feature, name) pair is not in the CommandReference data or if the data doesn’t have values defined for the ‘get_command’ and (optional) ‘get_value’ fields.

  • (Cisco::UnsupportedError) —

    if the (feature, name) pair is flagged in the YAML as unsupported on this device.

  • (Cisco::RequestFailed) —

    if the command is rejected by the device.



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# File 'lib/cisco_node_utils/node.rb', line 53

def config_get(feature, property, *args)
  ref = @cmd_ref.lookup(feature, property)

  # If we have a default value but no getter, just return the default
  return ref.default_value if ref.default_value? && !ref.getter?

  get_args = ref.getter(*args)
  massage(get(command:     ref.get_command,
              data_format: get_args[:data_format],
              context:     get_args[:context],
              value:       get_args[:value]),
          ref)
end

#config_get_default(feature, property) ⇒ String?

Uses CommandReference to lookup the default value for a given feature and feature property.

Examples:

config_get_default(“vtp”, “file”)

Parameters:

  • feature (String)
  • name (String)

Returns:

  • (String)
  • (nil) —

    if this feature/name pair is marked as unsupported

Raises:

  • (IndexError) —

    if the given (feature, name) pair is not in the CommandReference data or if the data doesn’t have values defined for the ‘default_value’ field.



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# File 'lib/cisco_node_utils/node.rb', line 114

def config_get_default(feature, property)
  ref = @cmd_ref.lookup(feature, property)
  ref.default_value
end

#config_set(feature, property, *args) ⇒ Object

Uses CommandReference to look up the given config command(s) of interest and then applies the configuration.

Examples:

config_set(“vtp”, “domain”, “example.com”)

config_set(“ospf”, “router_id”,

{:name => "green", :vrf => "one", :state => "",
 :router_id => "192.0.0.1"})

Parameters:

  • feature (String)
  • name (String)
  • args (*String) —

    zero or more args to be substituted into the cmdref.

Raises:

  • (IndexError) —

    if no relevant cmd_ref config_set exists

  • (ArgumentError) —

    if too many or too few args are provided.

  • (Cisco::UnsupportedError) —

    if this feature/name is unsupported

  • (Cisco::RequestFailed) —

    if any command is rejected by the device.



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# File 'lib/cisco_node_utils/node.rb', line 134

def config_set(feature, property, *args)
  ref = @cmd_ref.lookup(feature, property)
  set_args = ref.setter(*args)
  set(**set_args)
end

#domain_name ⇒ String

Returns such as “example.com”.

Returns:

  • (String) —

    such as “example.com”



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# File 'lib/cisco_node_utils/node.rb', line 261

def domain_name
  config_get('dnsclient', 'domain_name')
end

#get(**kwargs) ⇒ Object

Send a show command to the device. In general, clients should use config_get() rather than calling this function directly.

Raises:



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# File 'lib/cisco_node_utils/node.rb', line 205

def get(**kwargs)
  @client.get(**kwargs)
end

#host_name ⇒ String

Returns such as “bxb-oa-n3k-7”.

Returns:

  • (String) —

    such as “bxb-oa-n3k-7”



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# File 'lib/cisco_node_utils/node.rb', line 256

def host_name
  config_get('show_version', 'host_name')
end

#inspect ⇒ Object 



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# File 'lib/cisco_node_utils/node.rb', line 171

def inspect
  "Node: client:'#{client.inspect}' cmd_ref:'#{cmd_ref.inspect}'"
end

#last_reset_reason ⇒ String

Returns such as “Reset Requested by CLI command reload”.

Returns:

  • (String) —

    such as “Reset Requested by CLI command reload”



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# File 'lib/cisco_node_utils/node.rb', line 282

def last_reset_reason
  config_get('show_version', 'last_reset_reason')
end

#last_reset_time ⇒ String

Returns timestamp of last reset time.

Returns:

  • (String) —

    timestamp of last reset time



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# File 'lib/cisco_node_utils/node.rb', line 277

def last_reset_time
  config_get('show_version', 'last_reset_time')
end

#massage(value, ref) ⇒ Object

Attempt to massage the given value into the format specified by the given CmdRef object.



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# File 'lib/cisco_node_utils/node.rb', line 69

def massage(value, ref)
  Cisco::Logger.debug "Massaging '#{value}' (#{value.inspect})"
  if value.is_a?(Array) && !ref.multiple
    fail "Expected zero/one value but got '#{value}'" if value.length > 1
    value = value[0]
  end
  if (value.nil? || value.empty?) && ref.default_value? && ref.auto_default
    Cisco::Logger.debug "Default: #{ref.default_value}"
    return ref.default_value
  end
  return value unless ref.kind
  case ref.kind
  when :boolean
    if value.nil? || value.empty?
      value = false
    elsif /^no / =~ value
      value = false
    elsif /disable$/ =~ value
      value = false
    else
      value = true
    end
  when :int
    value = value.to_i unless value.nil?
  when :string
    value = '' if value.nil?
    value = value.to_s.strip
  when :symbol
    value = value.to_sym unless value.nil?
  end
  Cisco::Logger.debug "Massaged to '#{value}'"
  value
end

#os ⇒ String

Returns such as “Cisco Nexus Operating System (NX-OS) Software”.

Returns:

  • (String) —

    such as “Cisco Nexus Operating System (NX-OS) Software”



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# File 'lib/cisco_node_utils/node.rb', line 210

def os
  o = config_get('show_version', 'header')
  fail 'failed to retrieve operating system information' if o.nil?
  o.split("\n")[0]
end

#os_version ⇒ String

Returns such as “6.0(2)U5(1) [build 6.0(2)U5(0.941)]”.

Returns:

  • (String) —

    such as “6.0(2)U5(1) [build 6.0(2)U5(0.941)]”



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# File 'lib/cisco_node_utils/node.rb', line 217

def os_version
  config_get('show_version', 'version')
end

#product_description ⇒ String

Returns such as “Nexus 3048 Chassis”.

Returns:

  • (String) —

    such as “Nexus 3048 Chassis”



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# File 'lib/cisco_node_utils/node.rb', line 222

def product_description
  config_get('show_version', 'description')
end

#product_id ⇒ String

Returns such as “N3K-C3048TP-1GE”.

Returns:

  • (String) —

    such as “N3K-C3048TP-1GE”



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# File 'lib/cisco_node_utils/node.rb', line 227

def product_id
  if @cmd_ref
    return config_get('inventory', 'productid')
  else
    # We use this function to *find* the appropriate CommandReference
    if @client.platform == :nexus
      entries = get(command:     'show inventory',
                    data_format: :nxapi_structured)
      return entries['TABLE_inv']['ROW_inv'][0]['productid']
    elsif @client.platform == :ios_xr
      # No support for structured output for this command yet
      output = get(command:     'show inventory',
                   data_format: :cli)
      return /NAME: "Rack 0".*\nPID: (\S+)/.match(output)[1]
    end
  end
end

#product_serial_number ⇒ String

Returns such as “FOC1722R0ET”.

Returns:

  • (String) —

    such as “FOC1722R0ET”



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# File 'lib/cisco_node_utils/node.rb', line 251

def product_serial_number
  config_get('inventory', 'serialnum')
end

#product_version_id ⇒ String

Returns such as “V01”.

Returns:

  • (String) —

    such as “V01”



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# File 'lib/cisco_node_utils/node.rb', line 246

def product_version_id
  config_get('inventory', 'versionid')
end

#set(**kwargs) ⇒ Object

Send a config command to the device. In general, clients should use config_set() rather than calling this function directly.

Raises:



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# File 'lib/cisco_node_utils/node.rb', line 196

def set(**kwargs)
  @client.set(**kwargs)
end

#system ⇒ String

Returns such as “bootflash:///n3000-uk9.6.0.2.U5.0.941.bin”.

Returns:

  • (String) —

    such as “bootflash:///n3000-uk9.6.0.2.U5.0.941.bin”



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# File 'lib/cisco_node_utils/node.rb', line 301

def system
  config_get('show_version', 'system_image')
end

#system_cpu_utilization ⇒ Float

Returns combined user/kernel CPU utilization.

Returns:

  • (Float) —

    combined user/kernel CPU utilization



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# File 'lib/cisco_node_utils/node.rb', line 287

def system_cpu_utilization
  output = config_get('system', 'resources')
  return output if output.nil?
  output['cpu_state_user'].to_f + output['cpu_state_kernel'].to_f
end

#system_uptime ⇒ Integer

Returns System uptime, in seconds.

Returns:

  • (Integer) —

    System uptime, in seconds



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# File 'lib/cisco_node_utils/node.rb', line 266

def system_uptime
  cache_flush
  t = config_get('show_system', 'uptime')
  fail 'failed to retrieve system uptime' if t.nil?
  # time units: t = ["0", "23", "15", "49"]
  t.map!(&:to_i)
  d, h, m, s = t
  (s + 60 * (m + 60 * (h + 24 * (d))))
end

#to_s ⇒ Object 



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# File 'lib/cisco_node_utils/node.rb', line 167

def to_s
  client.to_s
end