Class: ChefCore::TargetResolver

Inherits:
Object
  • Object
show all
Defined in:
lib/chef_core/target_resolver.rb

Overview

This class will resolve a provided target host name to one or more TargetHost instances. The target host name passed in to the constructor can contain up to two ranges in the form [0-9] and [a-z]. Multiple target host names can be passed in asa comma-separated list.

Use resolver_inst.targets to get the expanded list of TargetHost instances.

Defined Under Namespace

Classes: InvalidRange, TargetResolverError, TooManyRanges, TooManyTargets, UnsupportedProtocol

Constant Summary collapse

MAX_EXPANDED_TARGETS = 
24
SUPPORTED_PROTOCOLS = 
%w{winrm ssh}

Instance Method Summary collapse

Constructor Details

#initialize(target, default_protocol, conn_options, max_expanded_targets: MAX_EXPANDED_TARGETS) ⇒ TargetResolver

Returns a new instance of TargetResolver.



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# File 'lib/chef_core/target_resolver.rb', line 32

def initialize(target, default_protocol, conn_options, max_expanded_targets: MAX_EXPANDED_TARGETS)
  @max_expanded_targets = max_expanded_targets
  @default_proto = default_protocol
  @unparsed_target = target
  @split_targets = @unparsed_target.split(",")
  @conn_options = conn_options.dup
  @default_password = @conn_options.delete(:password)
  @default_user = @conn_options.delete(:user)
end

Instance Method Details

#config_for_target(url) ⇒ Object 



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# File 'lib/chef_core/target_resolver.rb', line 64

def config_for_target(url)
  prefix, target = prefix_from_target(url)

  inline_password = nil
  inline_user = nil
  host = target
  # Default greedy-scan of the regex means that
  # $2 will resolve to content after the final "@"
  # URL credentials will take precedence over the default :user
  # in @conn_opts
  if target =~ /(.*)@(.*)/
    inline_credentials = $1
    host = $2
    # We'll use a non-greedy match to grab everthinmg up to the first ':'
    # as username if there is no :, credentials is just the username
    if inline_credentials =~ /(.+?):(.*)/
      inline_user = $1
      inline_password = $2
    else
      inline_user = inline_credentials
    end
  end
  user, password = make_credentials(inline_user, inline_password)
  { url: "#{prefix}#{host}",
    user: user,
    password: password }
end

#expand_targets(target) ⇒ Object 



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# File 'lib/chef_core/target_resolver.rb', line 118

def expand_targets(target)
  @current_target = target # Hold onto this for error reporting
  do_parse([target.downcase])
end

#make_credentials(inline_user, inline_password) ⇒ Object

Merge the inline user/pass with the default user/pass, giving precedence to inline.



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# File 'lib/chef_core/target_resolver.rb', line 94

def make_credentials(inline_user, inline_password)
  user = inline_user || @default_user
  user = nil if user && user.empty?
  password = (inline_password || @default_password)
  password = nil if password && password.empty?
  [user, password]
end

#prefix_from_target(target) ⇒ Object 



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# File 'lib/chef_core/target_resolver.rb', line 102

def prefix_from_target(target)
  if target =~ /^(.+?):\/\/(.*)/
    # We'll store the existing prefix to avoid it interfering
    # with the check further below.
    if SUPPORTED_PROTOCOLS.include? $1.downcase
      prefix = "#{$1}://"
      target = $2
    else
      raise UnsupportedProtocol.new($1)
    end
  else
    prefix = "#{@default_proto}://"
  end
  [prefix, target]
end

#targets ⇒ Object

Returns the list of targets as an array of TargetHost instances



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# File 'lib/chef_core/target_resolver.rb', line 43

def targets
  return @targets unless @targets.nil?
  expanded_urls = []
  @split_targets.each do |target|
    expand_targets(target).each { |t| expanded_urls << t }
  end

  # Apply max_expanded_targets to the total list of resolved
  # targets, since multiple targets can be comma-separated.
  # Limiting it only in the expression resolver could still
  # yield more than the maximum.
  if expanded_urls.length > @max_expanded_targets
    raise TooManyTargets.new(expanded_urls.length, @max_expanded_targets)
  end

  @targets = expanded_urls.map do |url|
    config = @conn_options.merge(config_for_target(url))
    TargetHost.new(config.delete(:url), config)
  end
end