module Status

# File lib/whimsy/asf/status.rb, line 18
def self.active?
  Resolv::DNS.open do |rs|
    active = rs.getaddress(ACTIVE_HOSTNAME) # Official hostname as IP; might change during run
    begin
      @currentIP ||= rs.getaddress(hostname) # local as IP; should not change during a run
    rescue Resolv::ResolvError => e # allow this to fail on a test node
      raise unless testnode?
      $stderr.puts "WARNING: Failed to resolve local IP address: #{e}"
    end
    return @currentIP == active
  end
end

# File lib/whimsy/asf/status.rb, line 72
def self.activeIP # intended for CLI testing
  Resolv::DNS.open.getaddress(ACTIVE_HOSTNAME)
end

# File lib/whimsy/asf/status.rb, line 95
def self.banner
  link = nil
  msg = updates_disallowed_reason
  return {msg: msg, href: nil} if msg
  msg, link = notice
  return {msg: msg, href: link} if msg
  return nil
end

# File lib/whimsy/asf/status.rb, line 61
def self.currentIP # intended for CLI testing
  Resolv::DNS.open do |rs|
    begin
      @currentIP ||= rs.getaddress(hostname) # local as IP; should not change during a run
    rescue Resolv::ResolvError => e # allow this to fail on a test node
      raise unless testnode?
      $stderr.puts "WARNING: Failed to resolve local IP address: #{e}"
    end
  end
end

# File lib/whimsy/asf/status.rb, line 32
def self.hostname
  @hostname ||= Socket.gethostname
  @hostname
end

# File lib/whimsy/asf/status.rb, line 38
def self.migrating? # This is used to disable updates, see self.updates_disallowed_reason
  File.exist? '/srv/whimsy/migrating.txt' # default is false
end

# File lib/whimsy/asf/status.rb, line 77
def self.notice
  path =  '/srv/whimsy/www/notice.txt'
  if File.exist? path
    begin
      File.open(path) do |fh|
        return fh.readline.chomp, '/notice.txt'
      end
    rescue EOFError
    end
  end
  nil
end

# File lib/whimsy/asf/status.rb, line 43
def self.testnode?
  # Assume test nodes are not called whimsy...[.apache.org]
  hostname !~ %r{^whimsy.*(\.apache\.org)?$}
end

# File lib/whimsy/asf/status.rb, line 53
def self.updates_disallowed_reason
  return 'Updates unavailable due to migration.' if migrating?
  return nil if testnode?
  return 'Updates unavailable on this node. Please ensure you have logged in to the correct host.' unless active?

  nil
end