Class: Cisco::Utils

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

Overview

General utility class

Class Method Summary collapse

Class Method Details

.array_to_str(array, sort = true) ⇒ Object

This method converts an array to string form for ex: if the array has 1, 2 to 10, 83 to 2014, 3022 and the string will be “1,2-10,83-2014,3022”



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 212

def self.array_to_str(array, sort=true)
  farray = sort ? array.compact.uniq.sort : array.compact
  lranges = []
  unless farray.empty?
    l = array.first
    r = nil
    farray.each do |aelem|
      if r && aelem != r.succ
        if l == r
          lranges << l
        else
          lranges << Range.new(l, r)
        end
        l = aelem
      end
      r = aelem
    end
    if l == r
      lranges << l
    else
      lranges << Range.new(l, r)
    end
  end
  lranges.to_s.gsub('..', '-').delete('[').delete(']').delete(' ')
end

.bitmask_to_length(bitmask) ⇒ Object 



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 164

def self.bitmask_to_length(bitmask)
  # Convert bitmask to a 32-bit integer,
  # convert that to binary, and count the 1s
  IPAddr.new(bitmask).to_i.to_s(2).count('1')
rescue IPAddr::InvalidAddressError => e
  raise ArgumentError, "bitmask '#{bitmask}' is not valid: #{e}"
end

.chassis_pid?(ver_regexp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 111

def self.chassis_pid?(ver_regexp)
  require_relative 'platform'
  return true if Platform.chassis['pid'][ver_regexp]
end

.dash_range_to_elements(range) ⇒ Object

Convert a dash-range set into individual elements. This is useful for preparing inputs to delta_add_remove().

Inputs an array or string of dash-ranges:

["2-5", "9", "4-6"] or '2-5, 9, 4-6' or ['2-5, 9, 4-6']

Returns an array of range elements:

["2", "3", "4", "5", "6", "9"]



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 328

def self.dash_range_to_elements(range)
  return [] if range.nil?
  range = range.shift if range.is_a?(Array) && range.length == 1
  range = range.split(',') if range.is_a?(String)

  final = []
  range = dash_range_to_ruby_range(range)
  range.each do |rng|
    # 2..5 maps to ["2", "3", "4", "5"]
    final << rng.map(&:to_s)
  end
  final.flatten.uniq.sort
end

.dash_range_to_ruby_range(range) ⇒ Object

Convert a cli-dash-syntax range to ruby-range. This is useful for preparing inputs to merge_range().

Inputs an array or string of dash-syntax ranges -> returns an array of ruby ranges.

Accepts an array or string: [“2-5”, “9”, “4-6”] or ‘2-5, 9, 4-6’ Returns an array of ranges: [2..5, 9..9, 4..6]



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

def self.dash_range_to_ruby_range(range)
  range = range.split(',') if range.is_a?(String)
  range.map! do |rng|
    if rng[/-/]
      # '2-5' -> 2..5
      rng.split('-').inject { |a, e| a.to_i..e.to_i }
    else
      # '9' -> 9..9
      rng.to_i..rng.to_i
    end
  end
  range
end

.delta_add_remove(should, current = [], opt = nil) ⇒ Object 



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 136

def self.delta_add_remove(should, current=[], opt=nil)
  current = [] if current.nil?
  should = [] if should.nil?

  # Remove nil entries from array
  should.each(&:compact!) if depth(should) > 1
  delta = { add: should - current, remove: current - should }

  # Some cli properties cannot be updated, thus must be removed first
  return delta if opt == :updates_not_allowed

  # Delete entries from :remove if f1 is an update to an existing command
  delta[:add].each do |id, _|
    # Differentiate between comparing nested and unnested arrays by
    # checking the depth of the array.
    if depth(should) == 1
      delta[:remove].delete_if { |f1| [f1] if f1.to_s == id.to_s }
    else
      delta[:remove].delete_if { |f1, f2| [f1, f2] if f1.to_s == id.to_s }
    end
  end
  delta
end

.depth(a) ⇒ Object

Helper to build a hash of add/remove commands for a nested array. Useful for network, redistribute, etc.

 should: an array of expected cmds (manifest/recipe)
current: an array of existing cmds on the device



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 131

def self.depth(a)
  return 0 unless a.is_a?(Array)
  1 + depth(a[0])
end

.get_reset_range(total_range, remove_ranges) ⇒ Object

For spanning tree range based parameters, the range is very dynamic and so before the parameters are set, the rest of the range needs to be reset For ex: if the ranges 2-42 and 83-200 are getting set, and the total range of the given parameter is 1-4000 then 1,43-82,201-4000 needs to be reset. This method takes the set ranges and gives back the range to be reset



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 186

def self.get_reset_range(total_range, remove_ranges)
  fail 'invalid range' unless total_range.include?('-')
  return total_range if remove_ranges.empty?

  trs = total_range.gsub('-', '..')
  tra = trs.split('..').map { |d| Integer(d) }
  tr = tra[0]..tra[1]
  tarray = tr.to_a
  remove_ranges.each do |rr, _val|
    rarray = rr.gsub('-', '..').split(',')
    rarray.each do |elem|
      if elem.include?('..')
        elema = elem.split('..').map { |d| Integer(d) }
        ele = elema[0]..elema[1]
        tarray -= ele.to_a
      else
        tarray.delete(elem.to_i)
      end
    end
  end
  Utils.array_to_str(tarray)
end

.image_version?(ver_regexp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 106

def self.image_version?(ver_regexp)
  require_relative 'platform'
  return true if Platform.image_version[ver_regexp]
end

.length_to_bitmask(length) ⇒ Object

delta_add_remove



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 160

def self.length_to_bitmask(length)
  IPAddr.new('255.255.255.255').mask(length).to_s
end

.merge_range(range) ⇒ Object

Merge overlapping ranges.

Inputs an array of ruby ranges: [2..5, 9..9, 4..6] Returns an array of merged ruby ranges: [2..6, 9..9]



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 347

def self.merge_range(range)
  # sort to lowest range 'first' values:
  #    [2..5, 9..9, 4..6]  ->  [2..5, 4..6, 9..9]
  range = range.sort_by(&:first)

  *merged = range.shift
  range.each do |r|
    lastr = merged[-1]
    if lastr.last >= r.first - 1
      merged[-1] = lastr.first..[r.last, lastr.last].max
    else
      merged.push(r)
    end
  end
  merged
end

.nexus_i2_image ⇒ Object

Helper utility to check for older Nexus I2 images



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 101

def self.nexus_i2_image
  require_relative 'platform'
  true if Platform.image_version[/7.0.3.I2/]
end

.normalize_range_array(range, fmt = :array) ⇒ Object

normalize_range_array

Given a list of ranges, merge any overlapping ranges and sort them.

Note: The ranges are converted to ruby ranges for easy merging, then converted back to a cli-syntax range.

Accepts an array or string:

["2-5", "9", "4-6"]  -or-  '2-5, 9, 4-6'  -or-  ["2-5, 9, 4-6"]

Returns a merged and ordered range as an array or string:

["2-6", "9"] -or- '2-6,9'



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 250

def self.normalize_range_array(range, fmt=:array)
  return range if range.nil? || range.empty?
  range = range.clone

  # Handle string within an array: ["2-5, 9, 4-6"] to '2-5, 9, 4-6'
  range = range.shift if range.is_a?(Array) && range.length == 1

  # Handle string only: '2-5, 9, 4-6' to ["2-5", "9", "4-6"]
  range = range.split(',') if range.is_a?(String)

  # Convert to ruby-syntax ranges
  range = dash_range_to_ruby_range(range)

  # Sort & Merge
  merged = merge_range(range)

  # Convert back to cli dash-syntax
  merged_array = ruby_range_to_dash_range(merged)

  return merged_array.join(',') if fmt == :string
  merged_array
end

.process_network_mask(network) ⇒ Object

Helper utility method for ip/prefix format networks. For ip/prefix format ‘1.1.1.1/24’ or ‘2000:123:38::34/64’, we need to mask the address using the prefix length so that they are converted to ‘1.1.1.0/24’ or ‘2000:123:38::/64’



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 120

def self.process_network_mask(network)
  mask = network.split('/')[1]
  address = IPAddr.new(network).to_s
  network = address + '/' + mask unless mask.nil?
  network
end

.ruby_range_to_dash_range(range, type = :array) ⇒ Object

Convert a ruby-range to cli-dash-syntax.

Inputs an array of ruby ranges -> returns an array or string of dash-syntax ranges.

when (:array) [2..6, 9..9] -> [‘2-6’, ‘9’]

when (:string) [2..6, 9..9] -> ‘2-6, 9’



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 305

def self.ruby_range_to_dash_range(range, type=:array)
  fail unless range.is_a?(Array)
  range.map! do |r|
    if r.first == r.last
      # 9..9 -> '9'
      r.first.to_s
    else
      # 2..6 -> '2-6'
      r.first.to_s + '-' + r.last.to_s
    end
  end
  return range.join(', ') if type == :string
  range
end

.zero_pad_macaddr(mac) ⇒ Object

Helper to 0-pad a mac address.



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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 173

def self.zero_pad_macaddr(mac)
  return nil if mac.nil? || mac.empty?
  o1, o2, o3 = mac.split('.').map { |o| o.to_i(16).to_s(10) }
  sprintf('%04x.%04x.%04x', o1, o2, o3)
end