Add bin and edit workflow

bin/gems/webrick-1.9.1/lib/webrick/utils.rb

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+# frozen_string_literal: true
+#
+# 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 'io/nonblock'
+require 'etc'
+
+module WEBrick
+  module Utils
+    ##
+    # Sets IO operations on +io+ to be non-blocking
+    def set_non_blocking(io)
+      io.nonblock = true if io.respond_to?(:nonblock=)
+    end
+    module_function :set_non_blocking
+
+    ##
+    # Sets the close on exec flag for +io+
+    def set_close_on_exec(io)
+      io.close_on_exec = true if io.respond_to?(:close_on_exec=)
+    end
+    module_function :set_close_on_exec
+
+    ##
+    # Changes the process's uid and gid to the ones of +user+
+    def su(user)
+      if 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", uplevel: 1)
+      end
+    end
+    module_function :su
+
+    ##
+    # The server hostname
+    def getservername
+      Socket::gethostname
+    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)
+      unless port
+        raise ArgumentError, "must specify port"
+      end
+      sockets = Socket.tcp_server_sockets(address, port)
+      sockets = sockets.map {|s|
+        s.autoclose = false
+        ts = TCPServer.for_fd(s.fileno)
+        s.close
+        ts
+      }
+      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 "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 = Thread::Mutex.new # :nodoc:
+
+      ##
+      # Registers a new timeout handler
+      #
+      # +time+:: Timeout in seconds
+      # +exception+:: Exception to raise when timeout elapsed
+      def TimeoutHandler.register(seconds, exception)
+        at = Process.clock_gettime(Process::CLOCK_MONOTONIC) + seconds
+        instance.register(Thread.current, at, exception)
+      end
+
+      ##
+      # Cancels the timeout handler +id+
+      def TimeoutHandler.cancel(id)
+        instance.cancel(Thread.current, id)
+      end
+
+      def self.terminate
+        instance.terminate
+      end
+
+      ##
+      # Creates a new TimeoutHandler.  You should use ::register and ::cancel
+      # instead of creating the timeout handler directly.
+      def initialize
+        TimeoutMutex.synchronize{
+          @timeout_info = Hash.new
+        }
+        @queue = Thread::Queue.new
+        @watcher = nil
+      end
+
+      # :nodoc:
+      private \
+        def watch
+          to_interrupt = []
+          while true
+            now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+            wakeup = nil
+            to_interrupt.clear
+            TimeoutMutex.synchronize{
+              @timeout_info.each {|thread, ary|
+                next unless ary
+                ary.each{|info|
+                  time, exception = *info
+                  if time < now
+                    to_interrupt.push [thread, info.object_id, exception]
+                  elsif !wakeup || time < wakeup
+                    wakeup = time
+                  end
+                }
+              }
+            }
+            to_interrupt.each {|arg| interrupt(*arg)}
+            if !wakeup
+              @queue.pop
+            elsif (wakeup -= now) > 0
+              begin
+                (th = Thread.start {@queue.pop}).join(wakeup)
+              ensure
+                th&.kill&.join
+              end
+            end
+            @queue.clear
+          end
+        end
+
+      # :nodoc:
+      private \
+        def watcher
+          (w = @watcher)&.alive? and return w # usual case
+          TimeoutMutex.synchronize{
+            (w = @watcher)&.alive? and next w # pathological check
+            @watcher = Thread.start(&method(:watch))
+          }
+        end
+
+      ##
+      # Interrupts the timeout handler +id+ and raises +exception+
+      def interrupt(thread, id, exception)
+        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)
+        info = nil
+        TimeoutMutex.synchronize{
+          (@timeout_info[thread] ||= []) << (info = [time, exception])
+        }
+        @queue.push nil
+        watcher
+        return info.object_id
+      end
+
+      ##
+      # Cancels the timeout handler +id+
+      def cancel(thread, id)
+        TimeoutMutex.synchronize{
+          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
+
+      ##
+      def terminate
+        TimeoutMutex.synchronize{
+          @timeout_info.clear
+          @watcher&.kill&.join
+        }
+      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