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# # utils.rb -- Miscellaneous utilities # # Author: IPR -- Internet Programming with Ruby -- writers # Copyright (c) 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou # Copyright (c) 2002 Internet Programming with Ruby writers. All rights # reserved. # # $IPR: utils.rb,v 1.10 2003/02/16 22:22:54 gotoyuzo Exp $ require 'socket' require 'fcntl' begin require 'etc' rescue LoadError nil end module WEBrick module Utils ## # Sets IO operations on +io+ to be non-blocking def set_non_blocking(io) flag = File::NONBLOCK if defined?(Fcntl::F_GETFL) flag |= io.fcntl(Fcntl::F_GETFL) end io.fcntl(Fcntl::F_SETFL, flag) end module_function :set_non_blocking ## # Sets the close on exec flag for +io+ def set_close_on_exec(io) if defined?(Fcntl::FD_CLOEXEC) io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) end end module_function :set_close_on_exec ## # Changes the process's uid and gid to the ones of +user+ def su(user) if defined?(Etc) pw = Etc.getpwnam(user) Process::initgroups(user, pw.gid) Process::Sys::setgid(pw.gid) Process::Sys::setuid(pw.uid) else warn("WEBrick::Utils::su doesn't work on this platform") end end module_function :su ## # The server hostname def getservername host = Socket::gethostname begin Socket::gethostbyname(host)[0] rescue host end end module_function :getservername ## # Creates TCP server sockets bound to +address+:+port+ and returns them. # # It will create IPV4 and IPV6 sockets on all interfaces. def create_listeners(address, port, logger=nil) unless port raise ArgumentError, "must specify port" end res = Socket::getaddrinfo(address, port, Socket::AF_UNSPEC, # address family Socket::SOCK_STREAM, # socket type 0, # protocol Socket::AI_PASSIVE) # flag last_error = nil sockets = [] res.each{|ai| begin logger.debug("TCPServer.new(#{ai[3]}, #{port})") if logger sock = TCPServer.new(ai[3], port) port = sock.addr[1] if port == 0 Utils::set_close_on_exec(sock) sockets << sock rescue => ex logger.warn("TCPServer Error: #{ex}") if logger last_error = ex end } raise last_error if sockets.empty? return sockets end module_function :create_listeners ## # Characters used to generate random strings RAND_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "0123456789" + "abcdefghijklmnopqrstuvwxyz" ## # Generates a random string of length +len+ def random_string(len) rand_max = RAND_CHARS.bytesize ret = "" len.times{ ret << RAND_CHARS[rand(rand_max)] } ret end module_function :random_string ########### require "thread" require "timeout" require "singleton" ## # Class used to manage timeout handlers across multiple threads. # # Timeout handlers should be managed by using the class methods which are # synchronized. # # id = TimeoutHandler.register(10, Timeout::Error) # begin # sleep 20 # puts 'foo' # ensure # TimeoutHandler.cancel(id) # end # # will raise Timeout::Error # # id = TimeoutHandler.register(10, Timeout::Error) # begin # sleep 5 # puts 'foo' # ensure # TimeoutHandler.cancel(id) # end # # will print 'foo' # class TimeoutHandler include Singleton ## # Mutex used to synchronize access across threads TimeoutMutex = Mutex.new # :nodoc: ## # Registers a new timeout handler # # +time+:: Timeout in seconds # +exception+:: Exception to raise when timeout elapsed def TimeoutHandler.register(seconds, exception) TimeoutMutex.synchronize{ instance.register(Thread.current, Time.now + seconds, exception) } end ## # Cancels the timeout handler +id+ def TimeoutHandler.cancel(id) TimeoutMutex.synchronize{ instance.cancel(Thread.current, id) } end def initialize @timeout_info = Hash.new Thread.start{ while true now = Time.now @timeout_info.each{|thread, ary| ary.dup.each{|info| time, exception = *info interrupt(thread, info.object_id, exception) if time < now } } sleep 0.5 end } end ## # Interrupts the timeout handler +id+ and raises +exception+ def interrupt(thread, id, exception) TimeoutMutex.synchronize{ if cancel(thread, id) && thread.alive? thread.raise(exception, "execution timeout") end } end ## # Registers a new timeout handler # # +time+:: Timeout in seconds # +exception+:: Exception to raise when timeout elapsed def register(thread, time, exception) @timeout_info[thread] ||= Array.new @timeout_info[thread] << [time, exception] return @timeout_info[thread].last.object_id end ## # Cancels the timeout handler +id+ def cancel(thread, id) if ary = @timeout_info[thread] ary.delete_if{|info| info.object_id == id } if ary.empty? @timeout_info.delete(thread) end return true end return false end end ## # Executes the passed block and raises +exception+ if execution takes more # than +seconds+. # # If +seconds+ is zero or nil, simply executes the block def timeout(seconds, exception=Timeout::Error) return yield if seconds.nil? or seconds.zero? # raise ThreadError, "timeout within critical session" if Thread.critical id = TimeoutHandler.register(seconds, exception) begin yield(seconds) ensure TimeoutHandler.cancel(id) end end module_function :timeout end end
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