summaryrefslogtreecommitdiff
path: root/jni/ruby/lib/webrick/server.rb
blob: 4aafd1e7febe3c5514d9e2200fade991e9038207 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
#
# server.rb -- GenericServer Class
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: server.rb,v 1.62 2003/07/22 19:20:43 gotoyuzo Exp $

require 'thread'
require 'socket'
require 'webrick/config'
require 'webrick/log'

module WEBrick

  ##
  # Server error exception

  class ServerError < StandardError; end

  ##
  # Base server class

  class SimpleServer

    ##
    # A SimpleServer only yields when you start it

    def SimpleServer.start
      yield
    end
  end

  ##
  # A generic module for daemonizing a process

  class Daemon

    ##
    # Performs the standard operations for daemonizing a process.  Runs a
    # block, if given.

    def Daemon.start
      exit!(0) if fork
      Process::setsid
      exit!(0) if fork
      Dir::chdir("/")
      File::umask(0)
      STDIN.reopen("/dev/null")
      STDOUT.reopen("/dev/null", "w")
      STDERR.reopen("/dev/null", "w")
      yield if block_given?
    end
  end

  ##
  # Base TCP server class.  You must subclass GenericServer and provide a #run
  # method.

  class GenericServer

    ##
    # The server status.  One of :Stop, :Running or :Shutdown

    attr_reader :status

    ##
    # The server configuration

    attr_reader :config

    ##
    # The server logger.  This is independent from the HTTP access log.

    attr_reader :logger

    ##
    # Tokens control the number of outstanding clients.  The
    # <code>:MaxClients</code> configuration sets this.

    attr_reader :tokens

    ##
    # Sockets listening for connections.

    attr_reader :listeners

    ##
    # Creates a new generic server from +config+.  The default configuration
    # comes from +default+.

    def initialize(config={}, default=Config::General)
      @config = default.dup.update(config)
      @status = :Stop
      @config[:Logger] ||= Log::new
      @logger = @config[:Logger]

      @tokens = SizedQueue.new(@config[:MaxClients])
      @config[:MaxClients].times{ @tokens.push(nil) }

      webrickv = WEBrick::VERSION
      rubyv = "#{RUBY_VERSION} (#{RUBY_RELEASE_DATE}) [#{RUBY_PLATFORM}]"
      @logger.info("WEBrick #{webrickv}")
      @logger.info("ruby #{rubyv}")

      @listeners = []
      @shutdown_pipe = nil
      unless @config[:DoNotListen]
        if @config[:Listen]
          warn(":Listen option is deprecated; use GenericServer#listen")
        end
        listen(@config[:BindAddress], @config[:Port])
        if @config[:Port] == 0
          @config[:Port] = @listeners[0].addr[1]
        end
      end
    end

    ##
    # Retrieves +key+ from the configuration

    def [](key)
      @config[key]
    end

    ##
    # Adds listeners from +address+ and +port+ to the server.  See
    # WEBrick::Utils::create_listeners for details.

    def listen(address, port)
      @listeners += Utils::create_listeners(address, port, @logger)
      setup_shutdown_pipe
    end

    ##
    # Starts the server and runs the +block+ for each connection.  This method
    # does not return until the server is stopped from a signal handler or
    # another thread using #stop or #shutdown.
    #
    # If the block raises a subclass of StandardError the exception is logged
    # and ignored.  If an IOError or Errno::EBADF exception is raised the
    # exception is ignored.  If an Exception subclass is raised the exception
    # is logged and re-raised which stops the server.
    #
    # To completely shut down a server call #shutdown from ensure:
    #
    #   server = WEBrick::GenericServer.new
    #   # or WEBrick::HTTPServer.new
    #
    #   begin
    #     server.start
    #   ensure
    #     server.shutdown
    #   end

    def start(&block)
      raise ServerError, "already started." if @status != :Stop
      server_type = @config[:ServerType] || SimpleServer

      server_type.start{
        @logger.info \
          "#{self.class}#start: pid=#{$$} port=#{@config[:Port]}"
        call_callback(:StartCallback)

        shutdown_pipe = @shutdown_pipe

        thgroup = ThreadGroup.new
        @status = :Running
        begin
          while @status == :Running
            begin
              if svrs = IO.select([shutdown_pipe[0], *@listeners], nil, nil, 2.0)
                if svrs[0].include? shutdown_pipe[0]
                  break
                end
                svrs[0].each{|svr|
                  @tokens.pop          # blocks while no token is there.
                  if sock = accept_client(svr)
                    sock.do_not_reverse_lookup = config[:DoNotReverseLookup]
                    th = start_thread(sock, &block)
                    th[:WEBrickThread] = true
                    thgroup.add(th)
                  else
                    @tokens.push(nil)
                  end
                }
              end
            rescue Errno::EBADF, Errno::ENOTSOCK, IOError => ex
              # if the listening socket was closed in GenericServer#shutdown,
              # IO::select raise it.
            rescue StandardError => ex
              msg = "#{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}"
              @logger.error msg
            rescue Exception => ex
              @logger.fatal ex
              raise
            end
          end
        ensure
          cleanup_shutdown_pipe(shutdown_pipe)
          cleanup_listener
          @status = :Shutdown
          @logger.info "going to shutdown ..."
          thgroup.list.each{|th| th.join if th[:WEBrickThread] }
          call_callback(:StopCallback)
          @logger.info "#{self.class}#start done."
          @status = :Stop
        end
      }
    end

    ##
    # Stops the server from accepting new connections.

    def stop
      if @status == :Running
        @status = :Shutdown
      end
    end

    ##
    # Shuts down the server and all listening sockets.  New listeners must be
    # provided to restart the server.

    def shutdown
      stop

      shutdown_pipe = @shutdown_pipe # another thread may modify @shutdown_pipe.
      if shutdown_pipe
        if !shutdown_pipe[1].closed?
          begin
            shutdown_pipe[1].close
          rescue IOError # closed by another thread.
          end
        end
      end
    end

    ##
    # You must subclass GenericServer and implement \#run which accepts a TCP
    # client socket

    def run(sock)
      @logger.fatal "run() must be provided by user."
    end

    private

    # :stopdoc:

    ##
    # Accepts a TCP client socket from the TCP server socket +svr+ and returns
    # the client socket.

    def accept_client(svr)
      sock = nil
      begin
        sock = svr.accept
        sock.sync = true
        Utils::set_non_blocking(sock)
        Utils::set_close_on_exec(sock)
      rescue Errno::ECONNRESET, Errno::ECONNABORTED,
             Errno::EPROTO, Errno::EINVAL
      rescue StandardError => ex
        msg = "#{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}"
        @logger.error msg
      end
      return sock
    end

    ##
    # Starts a server thread for the client socket +sock+ that runs the given
    # +block+.
    #
    # Sets the socket to the <code>:WEBrickSocket</code> thread local variable
    # in the thread.
    #
    # If any errors occur in the block they are logged and handled.

    def start_thread(sock, &block)
      Thread.start{
        begin
          Thread.current[:WEBrickSocket] = sock
          begin
            addr = sock.peeraddr
            @logger.debug "accept: #{addr[3]}:#{addr[1]}"
          rescue SocketError
            @logger.debug "accept: <address unknown>"
            raise
          end
          call_callback(:AcceptCallback, sock)
          block ? block.call(sock) : run(sock)
        rescue Errno::ENOTCONN
          @logger.debug "Errno::ENOTCONN raised"
        rescue ServerError => ex
          msg = "#{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}"
          @logger.error msg
        rescue Exception => ex
          @logger.error ex
        ensure
          @tokens.push(nil)
          Thread.current[:WEBrickSocket] = nil
          if addr
            @logger.debug "close: #{addr[3]}:#{addr[1]}"
          else
            @logger.debug "close: <address unknown>"
          end
          sock.close unless sock.closed?
        end
      }
    end

    ##
    # Calls the callback +callback_name+ from the configuration with +args+

    def call_callback(callback_name, *args)
      if cb = @config[callback_name]
        cb.call(*args)
      end
    end

    def setup_shutdown_pipe
      if !@shutdown_pipe
        @shutdown_pipe = IO.pipe
      end
      @shutdown_pipe
    end

    def cleanup_shutdown_pipe(shutdown_pipe)
      @shutdown_pipe = nil
      shutdown_pipe.each {|io|
        if !io.closed?
          begin
            io.close
          rescue IOError # another thread closed io.
          end
        end
      }
    end

    def cleanup_listener
      @listeners.each{|s|
        if @logger.debug?
          addr = s.addr
          @logger.debug("close TCPSocket(#{addr[2]}, #{addr[1]})")
        end
        begin
          s.shutdown
        rescue Errno::ENOTCONN
          # when `Errno::ENOTCONN: Socket is not connected' on some platforms,
          # call #close instead of #shutdown.
          # (ignore @config[:ShutdownSocketWithoutClose])
          s.close
        else
          unless @config[:ShutdownSocketWithoutClose]
            s.close
          end
        end
      }
      @listeners.clear
    end
  end    # end of GenericServer
end