Class: Cisco::CommandReference

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

Overview

Builds reference hash for the platform specified in the product id.

Constant Summary collapse

KNOWN_PLATFORMS = 
%w(C3064 C3132 C3172 N3k N5k N6k N7k N8k N9k XRv9k)
KNOWN_FILTERS = 
%w(nexus ios_xr cli nxapi_structured)
@@debug =

rubocop:disable Style/ClassVars

false

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(product: nil, platform: nil, data_formats: [], files: nil) ⇒ CommandReference

Constructor. Normal usage is to pass product, platform, data_formats, in which case usual YAML files will be located then the list will be filtered down to only those matching the given settings. For testing purposes (only!) you can pass an explicit list of files to load instead. This list will NOT be filtered further by product_id.



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# File 'lib/cisco_node_utils/command_reference.rb', line 354

def initialize(product:      nil,
               platform:     nil,
               data_formats: [],
               files:        nil)
  @product_id = product
  @platform = platform
  @data_formats = data_formats
  @hash = {}
  if files
    @files = files
  else
    @files = Dir.glob(__dir__ + '/cmd_ref/*.yaml')
  end

  build_cmd_ref
end

Instance Attribute Details

#data_formats ⇒ Object (readonly)

Returns the value of attribute data_formats.



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# File 'lib/cisco_node_utils/command_reference.rb', line 346

def data_formats
  @data_formats
end

#files ⇒ Object (readonly)

Returns the value of attribute files.



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# File 'lib/cisco_node_utils/command_reference.rb', line 346

def files
  @files
end

#platform ⇒ Object (readonly)

Returns the value of attribute platform.



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# File 'lib/cisco_node_utils/command_reference.rb', line 346

def platform
  @platform
end

#product_id ⇒ Object (readonly)

Returns the value of attribute product_id.



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# File 'lib/cisco_node_utils/command_reference.rb', line 346

def product_id
  @product_id
end

Class Method Details

.debug=(value) ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 340

def self.debug=(value)
  fail ArgumentError, 'Debug must be boolean' unless value == true ||
                                                     value == false
  @@debug = value # rubocop:disable Style/ClassVars
end

.filter_hash(hash, platform: nil, product_id: nil, data_formats: nil, allow_unknown_keys: true) ⇒ Object

Helper method Given a Hash of command reference data as read from YAML, does:

  • Delete any platform-specific data not applicable to this platform

  • Delete any product-specific data not applicable to this product_id

  • Delete any data-model-specific data not supported by this node

Returns the filtered hash (possibly empty)



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# File 'lib/cisco_node_utils/command_reference.rb', line 472

def self.filter_hash(hash,
                     platform:           nil,
                     product_id:         nil,
                     data_formats:       nil,
                     allow_unknown_keys: true)
  result = {}

  exclude = hash['_exclude'] || []
  exclude.each do |value|
    # We don't allow exclusion by data_format - just platform/product
    if key_match(value, platform, product_id, nil) == true
      debug "Exclude this product (#{product_id}, #{value})"
      return result
    end
  end

  # to_inspect: sub-keys we want to recurse into
  to_inspect = []
  # regexp_match: did we find a product_id regexp that matches?
  regexp_match = false

  hash.each do |key, value|
    next if key == '_exclude'
    if CmdRef.keys.include?(key)
      result[key] = value
    elsif key != 'else'
      match = key_match(key, platform, product_id, data_formats)
      next if match == false
      if match == :unknown
        fail "Unrecognized key '#{key}'" unless allow_unknown_keys
      end
      regexp_match = true if match == true
      to_inspect << key
    end
  end
  # If we didn't find any platform regexp match,
  # and an 'else' sub-hash is provided, descend into 'else'
  to_inspect << 'else' if hash.key?('else') && !regexp_match
  # Recurse! Sub-hashes can override the base hash
  to_inspect.each do |key|
    unless hash[key].is_a?(Hash)
      result[key] = hash[key]
      next
    end
    begin
      result[key] = filter_hash(hash[key],
                                platform:           platform,
                                product_id:         product_id,
                                data_formats:       data_formats,
                                allow_unknown_keys: false)
    rescue RuntimeError => e
      # Recursively wrap the error as needed to provide context
      raise "[#{key}]: #{e}"
    end
  end
  result
end

.hash_merge(input_hash, base_hash = nil) ⇒ Object

Helper method Given a suitably filtered Hash of command reference data, does:

  • Inherit data from the given base_hash (if any) and extend/override it with the given input data.



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# File 'lib/cisco_node_utils/command_reference.rb', line 541

def self.hash_merge(input_hash, base_hash=nil)
  return base_hash if input_hash.nil?
  result = base_hash
  result ||= {}
  # to_inspect: sub-hashes we want to recurse into
  to_inspect = []

  input_hash.each do |key, value|
    if CmdRef.keys.include?(key)
      result[key] = value
    elsif value.is_a?(Hash)
      to_inspect << value
    elsif value.nil?
      next
    else
      fail "Unexpected non-hash data: #{value}"
    end
  end
  # Recurse! Sub-hashes can override the base hash
  to_inspect.each do |hash|
    result = hash_merge(hash, result)
  end
  result
end

.key_match(key, platform, product_id, data_formats) ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 454

def self.key_match(key, platform, product_id, data_formats)
  if KNOWN_PLATFORMS.include?(key)
    return platform_to_filter(key) =~ product_id ? true : false
  elsif KNOWN_FILTERS.include?(key)
    return true if data_formats && data_formats.include?(key.to_sym)
    return true if key == platform.to_s
    return false
  else
    return :unknown
  end
end

.platform_to_filter(platform) ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 439

def self.platform_to_filter(platform)
  if KNOWN_PLATFORMS.include?(platform)
    case platform
    when 'XRv9k'
      /XRV9/
    else
      Regexp.new platform.tr('k', '')
    end
  else
    fail IndexError, "Unknown platform key '#{platform}'"
  end
end

.value_append(base_value, new_value) ⇒ Object

Helper method. Combines the two given values (either or both of which may be arrays) into a single combined array value_append(‘foo’, ‘bar’) ==> [‘foo’, ‘bar’] value_append(‘foo’, [‘bar’, ‘baz’]) ==> [‘foo’, ‘bar’, ‘baz’]



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# File 'lib/cisco_node_utils/command_reference.rb', line 571

def self.value_append(base_value, new_value)
  base_value = [base_value] unless base_value.is_a?(Array)
  new_value = [new_value] unless new_value.is_a?(Array)
  base_value + new_value
end

Instance Method Details

#build_cmd_ref ⇒ Object

Build complete reference hash.



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

def build_cmd_ref
  # Example id's: N3K-C3048TP-1GE, N3K-C3064PQ-10GE, N7K-C7009, N7K-C7009
  debug "Product: #{@product_id}"
  debug "Files being used: #{@files.join(', ')}"

  @files.each do |file|
    feature = File.basename(file).split('.')[0]
    debug "Processing file '#{file}' as feature '#{feature}'"
    feature_hash = load_yaml(file)
    if feature_hash.empty?
      debug "Feature #{feature} is empty"
      next
    end
    begin
      feature_hash = filter_hash(feature_hash)
    rescue RuntimeError => e
      raise "#{file}: #{e}"
    end
    if feature_hash.empty?
      debug "Feature #{feature} is excluded"
      @hash[feature] = UnsupportedCmdRef.new(feature, nil, file)
      next
    end

    base_hash = {}
    if feature_hash.key?('_template')
      base_hash = CommandReference.hash_merge(feature_hash['_template'])
    end

    feature_hash.each do |name, value|
      fail "No entries under '#{name}' in '#{file}'" if value.nil?
      @hash[feature] ||= {}
      if value.empty?
        @hash[feature][name] = UnsupportedCmdRef.new(feature, name, file)
      else
        values = CommandReference.hash_merge(value, base_hash.clone)
        @hash[feature][name] = CmdRef.new(feature, name, values, file)
      end
    end
  end
end

#debug(text) ⇒ Object

Print debug statements



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# File 'lib/cisco_node_utils/command_reference.rb', line 433

def debug(text)
  puts "DEBUG: #{text}" if @@debug
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cisco_node_utils/command_reference.rb', line 428

def empty?
  @hash.empty?
end

#filter_hash(input_hash) ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 530

def filter_hash(input_hash)
  CommandReference.filter_hash(input_hash,
                               platform:     platform,
                               product_id:   product_id,
                               data_formats: data_formats)
end

#inspect ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 698

def inspect
  "CommandReference for '#{product_id}' " \
    "(platform:'#{platform}', data formats:#{data_formats}) " \
    "based on #{files.length} files"
end

#load_yaml(yaml_file) ⇒ Object

Read in yaml file. The expectation is that a file corresponds to a feature



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# File 'lib/cisco_node_utils/command_reference.rb', line 669

def load_yaml(yaml_file)
  fail "File #{yaml_file} doesn't exist." unless File.exist?(yaml_file)
  # Parse YAML file into a tree of nodes
  # Psych::SyntaxError doesn't inherit from StandardError in some versions,
  # so we want to explicitly catch it if using Psych.
  rescue_errors = [::StandardError, ::Psych::SyntaxError]
  yaml_parsed = File.open(yaml_file, 'r') do |f|
    begin
      YAML.parse(f)
    rescue *rescue_errors => e
      raise "unable to parse #{yaml_file}: #{e}"
    end
  end
  return {} unless yaml_parsed
  # Validate the node tree
  validate_yaml(yaml_parsed, yaml_file)
  # If validation passed, convert the node tree to a Ruby Hash.
  yaml_parsed.transform
end

#lookup(feature, name) ⇒ Object

Get the command reference



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# File 'lib/cisco_node_utils/command_reference.rb', line 421

def lookup(feature, name)
  value = @hash[feature]
  value = value[name] if value.is_a? Hash
  fail IndexError, "No CmdRef defined for #{feature}, #{name}" if value.nil?
  value
end

#supports?(feature, property = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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

def supports?(feature, property=nil)
  value = @hash[feature]
  value = value[property] if value.is_a?(Hash) && property
  !(value.is_a?(UnsupportedCmdRef) || value.nil?)
end

#to_s ⇒ Object 



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# File 'lib/cisco_node_utils/command_reference.rb', line 689

def to_s
  @num_features ||= @hash.values.length
  @num_attributes ||= @hash.values.inject(0) do |sum, n|
    sum + (n.is_a?(Hash) ? n.values.length : 1)
  end
  "CommandReference describing #{@num_features} features " \
    "with #{@num_attributes} attributes in total"
end