Class: Range::Client

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

Constant Summary collapse

@@NodeRegx =

used to split hostnames into component parts for compression

/
  ([-\w.]*?)                                # $1 - prefix
  (\d+)                                     # $2 - start of range
  (\.[-A-Za-z\d.]*[-A-Za-z]+[-A-Za-z\d.]*)? # optional domain
/x

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Client

Returns a new instance of Client.



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# File 'lib/rangeclient.rb', line 17

def initialize(options = {})
  @host = 'range'
  @host = ENV['RANGE_HOST'] if ENV.has_key?('RANGE_HOST')
  @host = options[:host] if options.member?(:host)

  @port = '80'
  @port = ENV['RANGE_PORT'] if ENV.has_key?('RANGE_PORT')
  @port = options[:port] if options.member?(:port)

  @timeout = 60
  @timeout = options[:timeout] if options.member?(:timeout)
end

Instance Attribute Details

#host ⇒ Object

Returns the value of attribute host.



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# File 'lib/rangeclient.rb', line 8

def host
  @host
end

#port ⇒ Object

Returns the value of attribute port.



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# File 'lib/rangeclient.rb', line 8

def port
  @port
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/rangeclient.rb', line 8

def timeout
  @timeout
end

Instance Method Details

#_extra_compress(nodes) ⇒ Object 



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# File 'lib/rangeclient.rb', line 84

def _extra_compress(nodes)
  domains = {}
  nodes = nodes.dup
  nodes.each do |node|
    node.gsub!(/^([a-z]+)(\d+)([a-z]\w+)\./) { "#{$1}#{$2}.UNDOXXX#{$3}." }
  end
  result = _simple_compress(nodes)
  result.each_char do |r|
    r.gsub!(/(\d+\.\.\d+)\.UNDOXXX/) {"{#{$1}}"}
    r.gsub!(/(\d+)\.UNDOXXX/) {"#{$1}"}
  end
  return result
end

#_get_group(prefix, digits, count, suffix) ⇒ Object 



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# File 'lib/rangeclient.rb', line 171

def _get_group(prefix, digits, count, suffix)
  prefix = "" if prefix.nil?
  group = sprintf("%s%0*d..%s",
                  prefix,
                  digits.to_s.length, 
                  digits.to_i,   # sometimes has leading zeroes
                  _ignore_common_prefix(digits, (digits.to_i + count).to_s)
                  )
  suffix = "" if suffix.nil?
  return group + suffix
end

#_ignore_common_prefix(start_pos, end_pos) ⇒ Object 



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# File 'lib/rangeclient.rb', line 183

def _ignore_common_prefix(start_pos, end_pos)
  len_start = start_pos.to_s.length
  return end_pos if len_start < end_pos.to_s.length
  pick = 0
  len_start.times do |i|
    pick = i
    # find the point at which the two strings deviate
    break if (start_pos[0..i] != end_pos[0..i])
  end
  # and return that substring prior to deviation
  return end_pos[pick..-1]
end

#_simple_compress(nodes) ⇒ Object 



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# File 'lib/rangeclient.rb', line 98

def _simple_compress(nodes)
  # dedup nodes
  set = {}
  nodes.each do |node|
    set[node] = true
  end
  nodes = set.keys
  nodes = _sort_nodes(nodes)

  result = []
  prev_prefix, prev_digits, prev_suffix =  "", nil, ""
  prev_n = nil
  count = 0

  nodes.each do |n|
    if n =~ /\A#{@@NodeRegx}\z/
      # foo100abc => foo 100 abc
      prefix, digits, suffix = $1, $2, $3
      prefix = "" if prefix.nil?
      suffix = "" if suffix.nil?
    else
      prefix, digits, suffix = n, nil, nil
    end
    if (not digits.to_i.zero?) and
        (prefix == prev_prefix) and
        (suffix == prev_suffix) and
        (not prev_digits.nil?) and
        (digits.to_i == prev_digits.to_i + count + 1)
      count += 1
      next
    end
    
    if prev_n
      if count > 0
        result << _get_group(prev_prefix, prev_digits, count, prev_suffix)
      else
        result << prev_n
      end
    end
    prev_n = n
    prev_prefix = prefix
    prev_digits = digits
    prev_suffix = suffix
    count = 0
  end #nodes.each

  if count > 0
    result << _get_group(prev_prefix, prev_digits, count, prev_suffix)
  else
    result << prev_n
  end
  return result.join ","
end

#_sort_nodes(nodes) ⇒ Object 



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# File 'lib/rangeclient.rb', line 152

def _sort_nodes(nodes)
  sorted = nodes.map { |n|
    # decorate-sort-undecorate
    # FIXME can this all be pushed into sort_by?
    n =~ /\A#{@@NodeRegx}\z/

    [ n,
      $1.nil? ? "" : $1,
      $2.nil? ? 0 : $2.to_i,
      $3.nil? ? "" : $3,
    ]
  }.sort_by { |e|
    [ e[1], e[3], e[2], e[0] ]
  }.map { |n|
    n[0]
  }
  return sorted
end

#compress(nodes) ⇒ Object

Take a page from the Perl Seco::Data::Range and perform this locally – more efficient in both speed/size This was ported over from the Perl version, so it’s not quite idiomatic ruby



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# File 'lib/rangeclient.rb', line 49

def compress(nodes)
  domain_tbl = {}
  no_domain_list = []
  nodes.each do |n|
    # If this is a quoted range, just compress it without collapsing
    return _simple_compress(nodes) if n =~ /^(?:"|q\()/

    # Break out host and key by domain, to enable {foo1,foo3}.bar.com grouping
    host, domain = n.split('.', 2)
    if domain
      domain_tbl[domain] ||= []
      domain_tbl[domain] << host
    else
      no_domain_list << host
    end
  end
  result = []
  # Range elements with no domain component do not group
  # just return
  if not no_domain_list.empty?
    result << _simple_compress(no_domain_list)
  end

  domain_tbl.keys.sort.each do |domain|
    r = _extra_compress(domain_tbl[domain])
    r.gsub!(/\.#{domain},/) {","}
    r.gsub!(/\.#{domain}$/) {""}
    if r=~ /,/
      r = "{#{r}}"
    end
    result << "#{r}.#{domain}" 
  end
  return result.join ","
end

#expand(arg) ⇒ Object 



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# File 'lib/rangeclient.rb', line 30

def expand(arg)
  escaped_arg = CGI.escape arg
  http = Net::HTTP.new(@host, @port)
  http.read_timeout = @timeout
  req = Net::HTTP::Get.new('/range/list?' + escaped_arg)
  resp = http.request(req)
  return resp.body.split "\n"
end