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

.add_quotes(value) ⇒ Object

merge_range


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 372

def self.add_quotes(value)
  return value if image_version?(/7.3.[0-1]/) || value.nil?
  value = "'#{value}'" unless
    value.start_with?('"', "'") && value.end_with?('"', "'")
  value
end

.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 220

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

.attach_prefix(val, prop, prefix = nil) ⇒ Object

This method is used in config_set for CLIs which can set multiple properties using the same CLI. This method attaches prefix to the given property when the prefix is different from the property name else it attaches property name itself. It also appends the value to be set. For ex. if the set_value is <precedence> <time_range> the prop for precedence could be 'precedence', and for time_range, the prop and prefix could be 'time_range' and 'time-range'


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 414

def self.attach_prefix(val, prop, prefix=nil)
  prefix = prop.to_s if prefix.nil?
  val.to_s.empty? ? val : "#{prefix} #{val}"
end

.bitmask_to_length(bitmask) ⇒ Object


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 172

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


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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 336

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 290

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 144

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 139

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

.extract_value(match_method, prop, prefix = nil) ⇒ Object

This method is used in config_get for CLIs which have multiple properties in the same output Given a match_method which defines regex pattern and the match criteria, this method, extracts the value of a property with or without a prefix. For ex. if the regex pattern is something like: (?<action>S+)? the property to extract is action and prefix is nil for (?<src_port>range S+) the property to extract is src_port and prefix is range


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 389

def self.extract_value(match_method, prop, prefix=nil)
  prefix = prop if prefix.nil?
  mm = match_method

  return nil if mm.nil?

  return nil unless mm.names.include?(prop)

  # extract and return value that follows prefix + <space>
  regexp = Regexp.new("#{Regexp.escape(prefix)} (?<extracted>.*)")
  value_match = regexp.match(mm[prop])
  return nil if value_match.nil?
  value_match[:extracted]
end

.fretta?Boolean


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# File 'lib/cisco_node_utils/cisco_cmn_utils.rb', line 116

def self.fretta?
  require_relative 'platform'
  Platform.slots.each do |_x, row|
    return true if row['pid'][/-R/]
  end
  false
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 194

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


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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 168

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 355

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_imageObject

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 258

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 128

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 313

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 181

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