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#!/usr/bin/env ruby
# Phusion Passenger - http://www.modrails.com/
# Copyright (c) 2010, 2011 Phusion
#
# "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

STDOUT.sync = true
STDERR.sync = true

require 'uri'
require 'socket'

class PrespawnLocation
class InvalidURLError < RuntimeError
def initialize(url)
@url = url
end

def to_s
message
end

def message
"'#{@url}' is not a valid URL."
end
end

def self.parse(url)
uri = uri_for(url)

location = if uri.host == 'unix'
UNIXPrespawnLocation.new(uri)
else
case uri.scheme
when 'http'
TCPPrespawnLocation.new(uri)
when 'https'
SSLPrespawnLocation.new(uri)
end
end

unless location
raise InvalidURLError, url
end

location
end

def self.uri_for(url)
URI.parse(url)
rescue URI::InvalidURIError
raise InvalidURLError, url
end

def initialize(uri)
@uri = uri
end

def request_path
@uri.path.empty? ? '/' : @uri.path
end

def request_host
@uri.host
end

def socket
@socket ||= connect
end

def head_request
socket.write("HEAD #{request_path} HTTP/1.1\r\n")
socket.write("Host: #{request_host}\r\n")
socket.write("Connection: close\r\n")
socket.write("\r\n")

socket.read
end
end

class TCPPrespawnLocation < PrespawnLocation
def request_port
@uri.port
end

def connect
TCPSocket.new('127.0.0.1', request_port)
end
end

class SSLPrespawnLocation < TCPPrespawnLocation
def connect
require 'openssl'
socket = OpenSSL::SSL::SSLSocket.new(super)
socket.sync_close = true
socket.connect
socket
end
end

class UNIXPrespawnLocation < PrespawnLocation
def request_path
super.split(':', 2).last
end

def request_host
'_'
end

def socket_path
@uri.path.split(':', 2).first
end

def connect
UNIXSocket.new(socket_path)
end
end

url = ARGV[0]
begin
prespawn_location = PrespawnLocation.parse(url)
rescue PrespawnLocation::InvalidURLError => e
STDERR.puts "*** ERROR: #{e}"
exit 1
end

prespawn_location.head_request
Something went wrong with that request. Please try again.