Module: Injour

Defined in:
lib/injour.rb,
lib/injour/version.rb

Defined Under Namespace

Classes: Done, InjourServer

Constant Summary collapse

PORT = 
43215
SERVICE = 
"_injour._tcp"
INJOUR_STATUS = 
File.join(ENV['HOME'], '.injour')
VERSION = 
"0.2.3".freeze

Class Method Summary collapse

Class Method Details

.discover(timeout = 5) ⇒ Object 



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# File 'lib/injour.rb', line 68

def self.discover(timeout=5)
  waiting_thread = Thread.current

  dns = DNSSD.browse SERVICE do |reply|
    DNSSD.resolve reply.name, reply.type, reply.domain do |resolve_reply|
      service = InjourServer.new(reply.name, resolve_reply.target, resolve_reply.port)
      begin
        yield service
      rescue Done
        waiting_thread.run
      end
    end
  end

  puts "Gathering for up to #{timeout} seconds..."
  sleep timeout
  dns.stop
end

.find(name) ⇒ Object 



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# File 'lib/injour.rb', line 103

def self.find(name)
  found = nil

  discover do |obj|
    if obj.name == name
      found = obj
      raise Done
    end
  end

  return found
end

.get(name, limit = 10) ⇒ Object 



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# File 'lib/injour.rb', line 51

def self.get(name, limit = 10)
  host = find(name)

  if host.nil?
    STDERR.puts "ERROR: Unable to find #{name}"
  else
    puts retrieve_status_using_http(host.host, host.port, limit)
  end
end

.get_limit(query_string) ⇒ Object 



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# File 'lib/injour.rb', line 122

def self.get_limit(query_string)
  (query_string.match(/number=(\d+)/)[1]).to_i || 5
rescue
  5
end

.get_status(limit = 5) ⇒ Object 



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# File 'lib/injour.rb', line 116

def self.get_status(limit = 5)
  File.read(INJOUR_STATUS).split("\n").reverse.slice(0, limit).join("\n")
rescue # If file is not present, show an empty string
  ""  
end

.list(name = nil) ⇒ Object 



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# File 'lib/injour.rb', line 61

def self.list(name = nil)
  service_list.each do |service|
    puts "=== #{service.name} on #{service.host}:#{service.port} ==="
    puts "* #{retrieve_status_using_http(service.host, service.port, 1)}"
  end
end

.retrieve_status_using_http(host, port, limit) ⇒ Object 



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# File 'lib/injour.rb', line 47

def self.retrieve_status_using_http(host, port, limit)
  Net::HTTP.get_response(URI.parse("http://#{host}:#{port}/?number=#{limit}")).body
end

.serve(name = "", port = PORT) ⇒ Object 



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# File 'lib/injour.rb', line 128

def self.serve(name="", port=PORT)
  name = ENV['USER'] if name.empty?

  tr = DNSSD::TextRecord.new
  tr['description'] = "#{name}'s In/Out"
  
  DNSSD.register(name, SERVICE, "local", port.to_i, tr.encode) do |reply|
    puts "\nStarting #{name}'s Injour..."
  end
  
  # Don't log anything, everything goes in an abyss
  no_log = WEBrick::Log.new('/dev/null', WEBrick::Log::DEBUG)
  server = WEBrick::HTTPServer.new(:Port => port.to_i, :Logger => no_log, :AccessLog => no_log)

  # Open up a servlet, so that status can be viewed in a browser
  server.mount_proc("/") do |req, res|
    limit = get_limit(req.query_string)
    res.body = get_status(limit)
    res['Content-Type'] = "text/plain"
  end
  # Ctrl+C must quit it
  %w(INT TERM).each do |signal|
    trap signal do
      server.shutdown
      exit!
    end
  end
  # Start the server
  server.start
end

.service_list ⇒ Object 



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# File 'lib/injour.rb', line 87

def self.service_list
  list = Set.new
  discover { |obj| list << obj }
  
  return list
end

.set_status(message) ⇒ Object 



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# File 'lib/injour.rb', line 94

def self.set_status(message)
  File.open(INJOUR_STATUS, 'a') { |file| file.puts("[#{Time.now.strftime("%d-%b-%Y %I:%M %p")}] #{message}") }
  if message !~ /\S/
    puts 'Your status has been cleared.'
  else
    puts "Your status has been set to '#{message}'."
  end
end

.usage ⇒ Object 



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# File 'lib/injour.rb', line 23

def self.usage
  puts <<-HELP
Usage:

serve [<name>] [<port>]
Start up your injour server as <name> on <port>. <name> is your username
by default, and <port> is 43215. If you want to use the default <name>,
pass it as "".

status/st [<message>]
Publishes your [<message>] on Injour.

list/ls
List all people who are publishing statuses on Injour

show user [<number_of_statuses_to_show>]
Lists the last five updates from the 'user' by default. If you specify number_of_statuses_to_show, it will limit to that number.

help
Displays this message.

  HELP
end