module Status

active?() click to toggle source

Are we the active node? i.e. is our IP address the same as that of the active node

# 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

activeIP() click to toggle source

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

currentIP() click to toggle source

# 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

hostname() click to toggle source

this hostname

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

migrating?() click to toggle source

are we migrating?

# 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

testnode?() click to toggle source

are we a test node?

# 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

updates_disallowed_reason() click to toggle source

If local updates are not allowed, return reason string, else nil nil if:

active node
not migrating
or testnode

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

  nil
end

Constants

Public Class Methods