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# # Copyright (C) 2001 John W. Small All Rights Reserved # # Author:: John W. Small # Documentation:: Gavin Sinclair # Licence:: Freeware. # # See the class GServer for documentation. # require "socket" require "thread" # # GServer implements a generic server, featuring thread pool management, # simple logging, and multi-server management. See HttpServer in # <tt>xmlrpc/httpserver.rb</tt> in the Ruby standard library for an example of # GServer in action. # # Any kind of application-level server can be implemented using this class. # It accepts multiple simultaneous connections from clients, up to an optional # maximum number. Several _services_ (i.e. one service per TCP port) can be # run simultaneously, and stopped at any time through the class method # <tt>GServer.stop(port)</tt>. All the threading issues are handled, saving # you the effort. All events are optionally logged, but you can provide your # own event handlers if you wish. # # === Example # # Using GServer is simple. Below we implement a simple time server, run it, # query it, and shut it down. Try this code in +irb+: # # require 'gserver' # # # # # A server that returns the time in seconds since 1970. # # # class TimeServer < GServer # def initialize(port=10001, *args) # super(port, *args) # end # def serve(io) # io.puts(Time.now.to_i) # end # end # # # Run the server with logging enabled (it's a separate thread). # server = TimeServer.new # server.audit = true # Turn logging on. # server.start # # # *** Now point your browser to http://localhost:10001 to see it working *** # # # See if it's still running. # GServer.in_service?(10001) # -> true # server.stopped? # -> false # # # Shut the server down gracefully. # server.shutdown # # # Alternatively, stop it immediately. # GServer.stop(10001) # # or, of course, "server.stop". # # All the business of accepting connections and exception handling is taken # care of. All we have to do is implement the method that actually serves the # client. # # === Advanced # # As the example above shows, the way to use GServer is to subclass it to # create a specific server, overriding the +serve+ method. You can override # other methods as well if you wish, perhaps to collect statistics, or emit # more detailed logging. # # connecting # disconnecting # starting # stopping # # The above methods are only called if auditing is enabled. # # You can also override +log+ and +error+ if, for example, you wish to use a # more sophisticated logging system. # class GServer DEFAULT_HOST = "127.0.0.1" def serve(io) end @@services = {} # Hash of opened ports, i.e. services @@servicesMutex = Mutex.new def GServer.stop(port, host = DEFAULT_HOST) @@servicesMutex.synchronize { @@services[host][port].stop } end def GServer.in_service?(port, host = DEFAULT_HOST) @@services.has_key?(host) and @@services[host].has_key?(port) end def stop @connectionsMutex.synchronize { if @tcpServerThread @tcpServerThread.raise "stop" end } end def stopped? @tcpServerThread == nil end def shutdown @shutdown = true end def connections @connections.size end def join @tcpServerThread.join if @tcpServerThread end attr_reader :port, :host, :maxConnections attr_accessor :stdlog, :audit, :debug def connecting(client) addr = client.peeraddr log("#{self.class.to_s} #{@host}:#{@port} client:#{addr[1]} " + "#{addr[2]}<#{addr[3]}> connect") true end def disconnecting(clientPort) log("#{self.class.to_s} #{@host}:#{@port} " + "client:#{clientPort} disconnect") end protected :connecting, :disconnecting def starting() log("#{self.class.to_s} #{@host}:#{@port} start") end def stopping() log("#{self.class.to_s} #{@host}:#{@port} stop") end protected :starting, :stopping def error(detail) log(detail.backtrace.join("\n")) end def log(msg) if @stdlog @stdlog.puts("[#{Time.new.ctime}] %s" % msg) @stdlog.flush end end protected :error, :log def initialize(port, host = DEFAULT_HOST, maxConnections = 4, stdlog = $stderr, audit = false, debug = false) @tcpServerThread = nil @port = port @host = host @maxConnections = maxConnections @connections = [] @connectionsMutex = Mutex.new @connectionsCV = ConditionVariable.new @stdlog = stdlog @audit = audit @debug = debug end def start(maxConnections = -1) raise "running" if !stopped? @shutdown = false @maxConnections = maxConnections if maxConnections > 0 @@servicesMutex.synchronize { if GServer.in_service?(@port,@host) raise "Port already in use: #{host}:#{@port}!" end @tcpServer = TCPServer.new(@host,@port) @port = @tcpServer.addr[1] @@services[@host] = {} unless @@services.has_key?(@host) @@services[@host][@port] = self; } @tcpServerThread = Thread.new { begin starting if @audit while !@shutdown @connectionsMutex.synchronize { while @connections.size >= @maxConnections @connectionsCV.wait(@connectionsMutex) end } client = @tcpServer.accept @connections << Thread.new(client) { |myClient| begin myPort = myClient.peeraddr[1] serve(myClient) if !@audit or connecting(myClient) rescue => detail error(detail) if @debug ensure begin myClient.close rescue end @connectionsMutex.synchronize { @connections.delete(Thread.current) @connectionsCV.signal } disconnecting(myPort) if @audit end } end rescue => detail error(detail) if @debug ensure begin @tcpServer.close rescue end if @shutdown @connectionsMutex.synchronize { while @connections.size > 0 @connectionsCV.wait(@connectionsMutex) end } else @connections.each { |c| c.raise "stop" } end @tcpServerThread = nil @@servicesMutex.synchronize { @@services[@host].delete(@port) } stopping if @audit end } self end end