some source code about twisted

1_7.http_proxy_server/python/twisted-intro-dave/.gitignore

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+twistd.log*
+twistd.pid
+*.pyc
+_trial_temp
+twisted/plugins/dropin.cache

1_7.http_proxy_server/python/twisted-intro-dave/LICENSE

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+Copyright (c) 2009-2010 Dave Peticolas
+
+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.

1_7.http_proxy_server/python/twisted-intro-dave/README

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+These are the supporting files for an introduction to Twisted
+and asynchronous programming in Python located here:
+
+  http://krondo.com/?page_id=1327
+
+Dave Peticolas <dave@krondo.com>

1_7.http_proxy_server/python/twisted-intro-dave/async-client/get-poetry.py

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+# This is the asynchronous Get Poetry Now! client.
+
+import datetime, errno, optparse, select, socket
+
+
+def parse_args():
+    usage = """usage: %prog [options] [hostname]:port ...
+
+This is the Get Poetry Now! client, asynchronous edition.
+Run it like this:
+
+  python get-poetry.py port1 port2 port3 ...
+
+If you are in the base directory of the twisted-intro package,
+you could run it like this:
+
+  python async-client/get-poetry.py 10001 10002 10003
+
+to grab poetry from servers on ports 10001, 10002, and 10003.
+
+Of course, there need to be servers listening on those ports
+for that to work.
+"""
+
+    parser = optparse.OptionParser(usage)
+
+    _, addresses = parser.parse_args()
+
+    if not addresses:
+        print parser.format_help()
+        parser.exit()
+
+    def parse_address(addr):
+        if ':' not in addr:
+            host = '127.0.0.1'
+            port = addr
+        else:
+            host, port = addr.split(':', 1)
+
+        if not port.isdigit():
+            parser.error('Ports must be integers.')
+
+        return host, int(port)
+
+    return map(parse_address, addresses)
+
+
+def get_poetry(sockets):
+    """Download poety from all the given sockets."""
+
+    poems = dict.fromkeys(sockets, '') # socket -> accumulated poem
+
+    # socket -> task numbers
+    sock2task = dict([(s, i + 1) for i, s in enumerate(sockets)])
+
+    sockets = list(sockets) # make a copy
+
+    # we go around this loop until we've gotten all the poetry
+    # from all the sockets. This is the 'reactor loop'.
+
+    while sockets:
+        # this select call blocks until one or more of the
+        # sockets is ready for read I/O
+        rlist, _, _ = select.select(sockets, [], [])
+
+        # rlist is the list of sockets with data ready to read
+
+        for sock in rlist:
+            data = ''
+
+            while True:
+                try:
+                    new_data = sock.recv(1024)
+                except socket.error, e:
+                    if e.args[0] == errno.EWOULDBLOCK:
+                        # this error code means we would have
+                        # blocked if the socket was blocking.
+                        # instead we skip to the next socket
+                        break
+                    raise
+                else:
+                    if not new_data:
+                        break
+                    else:
+                        data += new_data
+
+            # Each execution of this inner loop corresponds to
+            # working on one asynchronous task in Figure 3 here:
+            # http://krondo.com/?p=1209#figure3
+
+            task_num = sock2task[sock]
+
+            if not data:
+                sockets.remove(sock)
+                sock.close()
+                print 'Task %d finished' % task_num
+            else:
+                addr_fmt = format_address(sock.getpeername())
+                msg = 'Task %d: got %d bytes of poetry from %s'
+                print  msg % (task_num, len(data), addr_fmt)
+
+            poems[sock] += data
+
+    return poems
+
+
+def connect(address):
+    """Connect to the given server and return a non-blocking socket."""
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.connect(address)
+    sock.setblocking(0)
+    return sock
+
+
+def format_address(address):
+    host, port = address
+    return '%s:%s' % (host or '127.0.0.1', port)
+
+
+def main():
+    addresses = parse_args()
+
+    start = datetime.datetime.now()
+
+    sockets = map(connect, addresses)
+
+    poems = get_poetry(sockets)
+
+    elapsed = datetime.datetime.now() - start
+
+    for i, sock in enumerate(sockets):
+        print 'Task %d: %d bytes of poetry' % (i + 1, len(poems[sock]))
+
+    print 'Got %d poems in %s' % (len(addresses), elapsed)
+
+
+if __name__ == '__main__':
+    main()

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/countdown.py

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+
+class Countdown(object):
+
+    counter = 5
+
+    def count(self):
+        if self.counter == 0:
+            reactor.stop()
+        else:
+            print self.counter, '...'
+            self.counter -= 1
+            reactor.callLater(1, self.count)
+
+from twisted.internet import reactor
+
+reactor.callWhenRunning(Countdown().count)
+
+print 'Start!'
+reactor.run()
+print 'Stop!'

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/exception.py

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+
+def falldown():
+    raise Exception('I fall down.')
+
+def upagain():
+    print 'But I get up again.'
+    reactor.stop()
+
+from twisted.internet import reactor
+
+reactor.callWhenRunning(falldown)
+reactor.callWhenRunning(upagain)
+
+print 'Starting the reactor.'
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/hello.py

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+
+def hello():
+    print 'Hello from the reactor loop!'
+    print 'Lately I feel like I\'m stuck in a rut.'
+
+from twisted.internet import reactor
+
+reactor.callWhenRunning(hello)
+
+print 'Starting the reactor.'
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/log.py

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+import sys
+
+from twisted.python import log
+from twisted.internet import defer
+
+"""This example illustrates some Twisted logging basics."""
+
+log.msg('This will not be logged, we have not installed a logger.')
+
+log.startLogging(sys.stdout)
+
+log.msg('This will be logged.')
+log.err('This will be logged as an error.')
+
+def bad_callback(result):
+    xxx
+
+try:
+    bad_callback()
+except:
+    log.err('The next function call will log the traceback as an error.')
+    log.err()
+
+d = defer.Deferred()
+
+def on_error(failure):
+    log.err('The next function call will log the failure as an error.')
+    log.err(failure)
+
+d.addCallback(bad_callback)
+d.addErrback(on_error)
+
+d.callback(True)
+
+log.msg('End of example.')

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/simple-poll.py

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+from twisted.internet import pollreactor
+pollreactor.install()
+
+from twisted.internet import reactor
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/simple.py

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+from twisted.internet import reactor
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/basic-twisted/stack.py

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+import traceback
+
+def stack():
+    print 'The python stack:'
+    traceback.print_stack()
+
+from twisted.internet import reactor
+reactor.callWhenRunning(stack)
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/blocking-client/get-poetry.py

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+# This is the blocking Get Poetry Now! client.
+
+import datetime, optparse, socket
+
+
+def parse_args():
+    usage = """usage: %prog [options] [hostname]:port ...
+
+This is the Get Poetry Now! client, blocking edition.
+Run it like this:
+
+  python get-poetry.py port1 port2 port3 ...
+
+If you are in the base directory of the twisted-intro package,
+you could run it like this:
+
+  python blocking-client/get-poetry.py 10001 10002 10003
+
+to grab poetry from servers on ports 10001, 10002, and 10003.
+
+Of course, there need to be servers listening on those ports
+for that to work.
+"""
+
+    parser = optparse.OptionParser(usage)
+
+    _, addresses = parser.parse_args()
+
+    if not addresses:
+        print parser.format_help()
+        parser.exit()
+
+    def parse_address(addr):
+        if ':' not in addr:
+            host = '127.0.0.1'
+            port = addr
+        else:
+            host, port = addr.split(':', 1)
+
+        if not port.isdigit():
+            parser.error('Ports must be integers.')
+
+        return host, int(port)
+
+    return map(parse_address, addresses)
+
+
+def get_poetry(address):
+    """Download a piece of poetry from the given address."""
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.connect(address)
+
+    poem = ''
+
+    while True:
+
+        # This is the 'blocking' call in this synchronous program.
+        # The recv() method will block for an indeterminate period
+        # of time waiting for bytes to be received from the server.
+
+        data = sock.recv(1024)
+
+        if not data:
+            sock.close()
+            break
+
+        poem += data
+
+    return poem
+
+
+def format_address(address):
+    host, port = address
+    return '%s:%s' % (host or '127.0.0.1', port)
+
+
+def main():
+    addresses = parse_args()
+
+    elapsed = datetime.timedelta()
+
+    for i, address in enumerate(addresses):
+        addr_fmt = format_address(address)
+
+        print 'Task %d: get poetry from: %s' % (i + 1, addr_fmt)
+
+        start = datetime.datetime.now()
+
+        # Each execution of 'get_poetry' corresponds to the
+        # execution of one synchronous task in Figure 1 here:
+        # http://krondo.com/?p=1209#figure1
+
+        poem = get_poetry(address)
+
+        time = datetime.datetime.now() - start
+
+        msg = 'Task %d: got %d bytes of poetry from %s in %s'
+        print  msg % (i + 1, len(poem), addr_fmt, time)
+
+        elapsed += time
+
+    print 'Got %d poems in %s' % (len(addresses), elapsed)
+
+
+if __name__ == '__main__':
+    main()

1_7.http_proxy_server/python/twisted-intro-dave/blocking-server/slowpoetry.py

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+# This is the blocking version of the Slow Poetry Server.
+
+import optparse, os, socket, time
+
+
+def parse_args():
+    usage = """usage: %prog [options] poetry-file
+
+This is the Slow Poetry Server, blocking edition.
+Run it like this:
+
+  python slowpoetry.py <path-to-poetry-file>
+
+If you are in the base directory of the twisted-intro package,
+you could run it like this:
+
+  python blocking-server/slowpoetry.py poetry/ecstasy.txt
+
+to serve up John Donne's Ecstasy, which I know you want to do.
+"""
+
+    parser = optparse.OptionParser(usage)
+
+    help = "The port to listen on. Default to a random available port."
+    parser.add_option('--port', type='int', help=help)
+
+    help = "The interface to listen on. Default is localhost."
+    parser.add_option('--iface', help=help, default='localhost')
+
+    help = "The number of seconds between sending bytes."
+    parser.add_option('--delay', type='float', help=help, default=.7)
+
+    help = "The number of bytes to send at a time."
+    parser.add_option('--num-bytes', type='int', help=help, default=10)
+
+    options, args = parser.parse_args()
+
+    if len(args) != 1:
+        parser.error('Provide exactly one poetry file.')
+
+    poetry_file = args[0]
+
+    if not os.path.exists(args[0]):
+        parser.error('No such file: %s' % poetry_file)
+
+    return options, poetry_file
+
+
+def send_poetry(sock, poetry_file, num_bytes, delay):
+    """Send some poetry slowly down the socket."""
+
+    inputf = open(poetry_file)
+
+    while True:
+        bytes = inputf.read(num_bytes)
+
+        if not bytes: # no more poetry :(
+            sock.close()
+            inputf.close()
+            return
+
+        print 'Sending %d bytes' % len(bytes)
+
+        try:
+            sock.sendall(bytes) # this is a blocking call
+        except socket.error:
+            sock.close()
+            inputf.close()
+            return
+
+        time.sleep(delay)
+
+
+def serve(listen_socket, poetry_file, num_bytes, delay):
+    while True:
+        sock, addr = listen_socket.accept()
+
+        print 'Somebody at %s wants poetry!' % (addr,)
+
+        send_poetry(sock, poetry_file, num_bytes, delay)
+
+
+def main():
+    options, poetry_file= parse_args()
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sock.bind((options.iface, options.port or 0))
+
+    sock.listen(5)
+
+    print 'Serving %s on port %s.' % (poetry_file, sock.getsockname()[1])
+
+    serve(sock, poetry_file, options.num_bytes, options.delay)
+
+
+if __name__ == '__main__':
+    main()

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-1.py

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+from twisted.internet import defer
+
+def callback(res):
+    print 'callback got:', res
+
+d = defer.Deferred()
+d.addCallback(callback)
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-10.py

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+from twisted.internet.defer import Deferred
+
+def send_poem(d):
+    print 'Sending poem'
+    d.callback('Once upon a midnight dreary')
+
+def get_poem():
+    """Return a poem 5 seconds later."""
+    from twisted.internet import reactor
+    d = Deferred()
+    reactor.callLater(5, send_poem, d)
+    return d
+
+
+def got_poem(poem):
+    print 'I got a poem:', poem
+
+def poem_error(err):
+    print 'get_poem failed:', err
+
+def main():
+    from twisted.internet import reactor
+    reactor.callLater(10, reactor.stop) # stop the reactor in 10 seconds
+
+    d = get_poem()
+    d.addCallbacks(got_poem, poem_error)
+
+    reactor.callLater(2, d.cancel) # cancel after 2 seconds
+
+    reactor.run()
+
+main()

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-11.py

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+from twisted.internet.defer import Deferred
+
+def send_poem(d):
+    print 'Sending poem'
+    d.callback('Once upon a midnight dreary')
+
+def get_poem():
+    """Return a poem 5 seconds later."""
+
+    def canceler(d):
+        # They don't want the poem anymore, so cancel the delayed call
+        delayed_call.cancel()
+
+        # At this point we have three choices:
+        #   1. Do nothing, and the deferred will fire the errback
+        #      chain with CancelledError.
+        #   2. Fire the errback chain with a different error.
+        #   3. Fire the callback chain with an alternative result.
+
+    d = Deferred(canceler)
+
+    from twisted.internet import reactor
+    delayed_call = reactor.callLater(5, send_poem, d)
+
+    return d
+
+
+def got_poem(poem):
+    print 'I got a poem:', poem
+
+def poem_error(err):
+    print 'get_poem failed:', err
+
+def main():
+    from twisted.internet import reactor
+    reactor.callLater(10, reactor.stop) # stop the reactor in 10 seconds
+
+    d = get_poem()
+    d.addCallbacks(got_poem, poem_error)
+
+    reactor.callLater(2, d.cancel) # cancel after 2 seconds
+
+    reactor.run()
+
+main()

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-12.py

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+from twisted.internet import defer
+
+def cancel_outer(d):
+    print "outer cancel callback."
+
+def cancel_inner(d):
+    print "inner cancel callback."
+
+def first_outer_callback(res):
+    print 'first outer callback, returning inner deferred'
+    return inner_d
+
+def second_outer_callback(res):
+    print 'second outer callback got:', res
+
+def outer_errback(err):
+    print 'outer errback got:', err
+
+outer_d = defer.Deferred(cancel_outer)
+inner_d = defer.Deferred(cancel_inner)
+
+outer_d.addCallback(first_outer_callback)
+outer_d.addCallbacks(second_outer_callback, outer_errback)
+
+outer_d.callback('result')
+
+# at this point the outer deferred has fired, but is paused
+# on the inner deferred.
+
+print 'canceling outer deferred.'
+outer_d.cancel()
+
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-2.py

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+from twisted.internet import defer
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred()
+d.addCallbacks(callback, errback)
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-3.py

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+from twisted.internet import defer
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred()
+d.addCallbacks(callback, errback)
+d.callback('result')
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-4.py

@@ -0,0 +1,13 @@
+from twisted.internet import defer
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred()
+d.addCallbacks(callback, errback)
+d.cancel()
+d.callback('result')
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-5.py

@@ -0,0 +1,15 @@
+from twisted.internet import defer
+
+def canceller(d):
+    print "I need to cancel this deferred:", d
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred(canceller) # created by lower-level code
+d.addCallbacks(callback, errback) # added by higher-level code
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-6.py

@@ -0,0 +1,17 @@
+from twisted.internet import defer
+
+def canceller(d):
+    print "I need to cancel this deferred:", d
+    print "Firing the deferred with a result"
+    d.callback('result')
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred(canceller) # created by lower-level code
+d.addCallbacks(callback, errback) # added by higher-level code
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-7.py

@@ -0,0 +1,17 @@
+from twisted.internet import defer
+
+def canceller(d):
+    print "I need to cancel this deferred:", d
+    print "Firing the deferred with an error"
+    d.errback(Exception('error!'))
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred(canceller) # created by lower-level code
+d.addCallbacks(callback, errback) # added by higher-level code
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-8.py

@@ -0,0 +1,16 @@
+from twisted.internet import defer
+
+def canceller(d):
+    print "I need to cancel this deferred:", d
+
+def callback(res):
+    print 'callback got:', res
+
+def errback(err):
+    print 'errback got:', err
+
+d = defer.Deferred(canceller) # created by lower-level code
+d.addCallbacks(callback, errback) # added by higher-level code
+d.callback('result')
+d.cancel()
+print 'done'

1_7.http_proxy_server/python/twisted-intro-dave/deferred-cancel/defer-cancel-9.py

@@ -0,0 +1,30 @@
+from twisted.internet.defer import Deferred
+
+def send_poem(d):
+    print 'Sending poem'
+    d.callback('Once upon a midnight dreary')
+
+def get_poem():
+    """Return a poem 5 seconds later."""
+    from twisted.internet import reactor
+    d = Deferred()
+    reactor.callLater(5, send_poem, d)
+    return d
+
+
+def got_poem(poem):
+    print 'I got a poem:', poem
+
+def poem_error(err):
+    print 'get_poem failed:', err
+
+def main():
+    from twisted.internet import reactor
+    reactor.callLater(10, reactor.stop) # stop the reactor in 10 seconds
+
+    d = get_poem()
+    d.addCallbacks(got_poem, poem_error)
+
+    reactor.run()
+
+main()

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-1.py

@@ -0,0 +1,9 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+print 'Empty List.'
+d = defer.DeferredList([])
+print 'Adding Callback.'
+d.addCallback(got_results)

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-2.py

@@ -0,0 +1,12 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+print 'One Deferred.'
+d1 = defer.Deferred()
+d = defer.DeferredList([d1])
+print 'Adding Callback.'
+d.addCallback(got_results)
+print 'Firing d1.'
+d1.callback('d1 result')

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-3.py

@@ -0,0 +1,15 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+print 'Two Deferreds.'
+d1 = defer.Deferred()
+d2 = defer.Deferred()
+d = defer.DeferredList([d1, d2])
+print 'Adding Callback.'
+d.addCallback(got_results)
+print 'Firing d1.'
+d1.callback('d1 result')
+print 'Firing d2.'
+d2.callback('d2 result')

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-4.py

@@ -0,0 +1,15 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+print 'Two Deferreds.'
+d1 = defer.Deferred()
+d2 = defer.Deferred()
+d = defer.DeferredList([d1, d2])
+print 'Adding Callback.'
+d.addCallback(got_results)
+print 'Firing d2.'
+d2.callback('d2 result')
+print 'Firing d1.'
+d1.callback('d1 result')

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-5.py

@@ -0,0 +1,13 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+d1 = defer.Deferred()
+d2 = defer.Deferred()
+d = defer.DeferredList([d1, d2], consumeErrors=True)
+d.addCallback(got_results)
+print 'Firing d1.'
+d1.callback('d1 result')
+print 'Firing d2 with errback.'
+d2.errback(Exception('d2 failure'))

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-6.py

@@ -0,0 +1,13 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+d1 = defer.Deferred()
+d2 = defer.Deferred()
+d = defer.DeferredList([d1, d2])
+d.addCallback(got_results)
+print 'Firing d1.'
+d1.callback('d1 result')
+print 'Firing d2 with errback.'
+d2.errback(Exception('d2 failure'))

1_7.http_proxy_server/python/twisted-intro-dave/deferred-list/deferred-list-7.py

@@ -0,0 +1,14 @@
+from twisted.internet import defer
+
+def got_results(res):
+    print 'We got:', res
+
+d1 = defer.Deferred()
+d2 = defer.Deferred()
+d = defer.DeferredList([d1, d2])
+d2.addErrback(lambda err: None) # handle d2 error
+d.addCallback(got_results)
+print 'Firing d1.'
+d1.callback('d1 result')
+print 'Firing d2 with errback.'
+d2.errback(Exception('d2 failure'))

1_7.http_proxy_server/python/twisted-intro-dave/erlang-client-1/get-poetry

@@ -0,0 +1,104 @@
+#!/usr/bin/env escript
+%% -*- erlang -*-
+%%! -smp enable
+
+-mode(compile).
+
+
+usage() ->
+    io:format("usage: get-poetry [hostname]:port ...
+
+This is the Get Poetry Now! client, Erlang Edition.
+Run it like this:
+
+  get-poetry port1 port2 port3 ...
+
+If you are in the base directory of the twisted-intro package,
+you could run it like this:
+
+  erlang-client/get-poetry 10001 10002 10003
+
+to grab poetry from servers on ports 10001, 10002, and 10003.
+
+Of course, there need to be servers listening on those ports
+for that to work.
+"),
+    halt(1).
+
+
+parse_args(Args) ->
+    try
+        [parse_addr(Arg) || Arg <- Args]
+    catch
+        _:_ ->
+            usage()
+    end.
+
+
+parse_addr(Addr) ->
+    parse_addr(Addr, []).
+
+parse_addr([], Accum) ->
+    {"localhost", erlang:list_to_integer(lists:reverse(Accum))};
+parse_addr([$:|Addr], Accum) ->
+    {lists:reverse(Accum), erlang:list_to_integer(Addr)};
+parse_addr([Ch|Addr], Accum) ->
+    parse_addr(Addr, [Ch|Accum]).
+
+
+enumerate(L) ->
+    enumerate(L, 1).
+
+enumerate([], _) ->
+    [];
+enumerate([X|Xs], N) ->
+    [{N, X} | enumerate(Xs, N+1)].
+
+
+collect_poems(0, Poems) ->
+    [io:format("~s\n", [P]) || P <- Poems];
+collect_poems(N, Poems) ->
+    receive
+        {'DOWN', _, _, _, _} ->
+            collect_poems(N-1, Poems);
+        {poem, Poem} ->
+            collect_poems(N, [Poem|Poems])
+    end.
+
+
+peername(Socket) ->
+    {ok, {IP, Port}} = inet:peername(Socket),
+    format_ip(IP) ++ ":" ++ erlang:integer_to_list(Port).
+
+format_ip(IP) when is_tuple(IP) ->
+    format_ip(erlang:tuple_to_list(IP));
+format_ip(IP) ->
+    string:join([erlang:integer_to_list(N) || N <- IP], ":").
+
+
+get_poetry(Tasknum, Addr, Main) ->
+    {Host, Port} = Addr,
+    {ok, Socket} = gen_tcp:connect(Host, Port,
+                                   [binary, {active, false}, {packet, 0}]),
+    get_poetry(Tasknum, Socket, Main, []).
+
+get_poetry(Tasknum, Socket, Main, Packets) ->
+    case gen_tcp:recv(Socket, 0) of
+        {ok, Packet} ->
+            io:format("Task ~w: got ~w bytes of poetry from ~s\n",
+                      [Tasknum, size(Packet), peername(Socket)]),
+            get_poetry(Tasknum, Socket, Main, [Packet|Packets]);
+        {error, _} ->
+            Main ! {poem, list_to_binary(lists:reverse(Packets))}
+    end.
+
+
+main([]) ->
+    usage();
+
+main(Args) ->
+    Addresses = parse_args(Args),
+    Main = self(),
+    [erlang:spawn_monitor(fun () -> get_poetry(TaskNum, Addr, Main) end)
+     || {TaskNum, Addr} <- enumerate(Addresses)],
+    collect_poems(length(Addresses), []).

1_7.http_proxy_server/python/twisted-intro-dave/haskell-client-1/.gitignore

@@ -0,0 +1,3 @@
+*.o
+*.hi
+get-poetry

1_7.http_proxy_server/python/twisted-intro-dave/haskell-client-1/get-poetry.hs

@@ -0,0 +1,79 @@
+{-
+A Get Poetry Now! client in Haskell.
+
+Avert your eyes, I don't really know what I'm doing.
+This just illustrates Haskell's use of asynchronous IO.
+
+To build the program, run this:
+
+  ghc --make get-poetry.hs
+
+Then run it like this:
+
+  ./get-poetry 10000 10001 10002
+
+You'll need to have poetry servers running on those ports, of course.
+-}
+
+import Network
+import System.IO
+import System.Environment
+import Control.Concurrent
+import Control.Exception
+
+data Task =
+    Task { taskNum :: Int,
+           taskHostname :: HostName,
+           taskPort :: PortNumber }
+    deriving (Show)
+
+
+parseServer :: String -> (HostName, PortNumber)
+parseServer arg
+    | ':' `elem` arg = (host, to_port portstr)
+    | otherwise = ("localhost", to_port arg)
+    where
+      (host, (_:portstr)) = break ((==) ':') arg
+      to_port = fromIntegral . (read :: String -> Integer)
+
+makeTasks :: [String] -> [Task]
+makeTasks args = zipWith makeTask args [1..]
+    where
+      makeTask arg num =
+          let (host, port) = parseServer arg
+          in Task { taskNum = num,
+                    taskHostname = host,
+                    taskPort = port }
+
+getPoetry :: Handle -> Task -> IO ()
+getPoetry h task = do
+  -- it looks like we read the whole poem here, but Haskell is lazy,
+  -- like Python generators, or some programmers you may know
+  poem <- hGetContents h
+  mapM_ gotLine $ lines poem
+  putStrLn poem
+  where
+    prefix = "Task " ++ (show $ taskNum task) ++ ": got "
+    suffix = concat [" bytes of poetry from ",
+                     (taskHostname task), ":",
+                     (show $ taskPort task)]
+    gotLine line =
+        putStrLn $ prefix ++ (show numbytes) ++ suffix
+        where numbytes = (length line) + 1
+
+runTask :: Task -> IO (MVar ())
+runTask task = do
+  h <- connectTo (taskHostname task) (PortNumber $ taskPort task)
+
+  mvar <- newEmptyMVar
+
+  -- read each poem in a Haskell lightweight thread
+  _ <- forkIO $ getPoetry h task `finally` putMVar mvar ()
+
+  return mvar
+
+main :: IO ()
+main = do
+  args <- getArgs
+  mvars <- mapM runTask $ makeTasks args
+  mapM_ takeMVar mvars -- wait for all the threads to finish

1_7.http_proxy_server/python/twisted-intro-dave/haskell-client-2/.gitignore

@@ -0,0 +1,3 @@
+*.o
+*.hi
+get-poetry

1_7.http_proxy_server/python/twisted-intro-dave/haskell-client-2/get-poetry.hs

@@ -0,0 +1,44 @@
+{-
+A Get Poetry Now! client in Haskell.
+
+Avert your eyes, I don't really know what I'm doing.
+This just illustrates Haskell's use of asynchronous IO.
+
+To build the program, run this:
+
+  ghc --make get-poetry.hs
+
+Then run it like this:
+
+  ./get-poetry 10000 10001 10002
+
+You'll need to have poetry servers running on those ports, of course.
+-}
+
+import Network
+import System.IO
+import System.Environment
+import Control.Concurrent
+
+parseServer :: String -> (HostName, PortNumber)
+parseServer arg
+    | ':' `elem` arg = (host, to_port portstr)
+    | otherwise = ("localhost", to_port arg)
+    where
+      (host, (_:portstr)) = break ((==) ':') arg
+      to_port = fromIntegral . (read :: String -> Integer)
+
+getPoem :: (HostName, PortNumber) -> IO (MVar String)
+getPoem (host, port) = do
+  mvar <- newEmptyMVar
+  _ <- forkIO (do h <- connectTo host (PortNumber $ port)
+                  poem <- hGetContents h
+                  putMVar mvar poem)
+  return mvar
+
+main :: IO ()
+main = do
+  args <- getArgs
+  mvars <- mapM getPoem (map parseServer args)
+  mapM_ (\mvar -> do poem <- takeMVar mvar
+                     putStrLn poem) mvars

1_7.http_proxy_server/python/twisted-intro-dave/images/.gitignore

@@ -0,0 +1 @@
+*.png

1_7.http_proxy_server/python/twisted-intro-dave/images/Makefile

@@ -0,0 +1,11 @@
+CONVERT=convert 
+SOURCES=*.svg
+IMAGES=$(SOURCES:.svg=.png)
+
+all: $(SOURCES) $(IMAGES)
+
+%.png : %.svg
+	$(CONVERT) $< $@
+
+clean:
+	rm *.png

1_7.http_proxy_server/python/twisted-intro-dave/images/application.svg

@@ -0,0 +1,842 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
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+         transform="translate(232.5848,59.337246)"
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+         height="177.26727"
+         width="469.81"
+         transform="matrix(-1,0,0,1,835.08644,0)"
+         id="use10806"
+         xlink:href="#path10804"
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+    <text
+       xml:space="preserve"
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+         sodipodi:role="line"
+         id="tspan9381-1-5"
+         x="604.39813"
+         y="2.6558828">the knowledge funnel</tspan></text>
+    <path
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+         sodipodi:role="line"
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1_7.http_proxy_server/python/twisted-intro-dave/images/threaded.svg

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+
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+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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+   xmlns:svg="http://www.w3.org/2000/svg"
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1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/gen-1.py

@@ -0,0 +1,12 @@
+
+def my_generator():
+    print 'starting up'
+    yield 1
+    print "workin'"
+    yield 2
+    print "still workin'"
+    yield 3
+    print 'done'
+
+for n in my_generator():
+    print n

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/gen-2.py

@@ -0,0 +1,19 @@
+
+def my_generator():
+    print 'starting up'
+    yield 1
+    print "workin'"
+    yield 2
+    print "still workin'"
+    yield 3
+    print 'done'
+
+gen = my_generator()
+
+while True:
+    try:
+        n = gen.next()
+    except StopIteration:
+        break
+    else:
+        print n

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/gen-3.py

@@ -0,0 +1,22 @@
+
+def my_generator():
+    yield 1
+    yield 2
+    yield 3
+
+def my_other_generator():
+    yield 10
+    yield 20
+    yield 30
+    yield 40
+
+gens = [my_generator(), my_other_generator()]
+
+while gens:
+    for g in gens[:]:
+        try:
+            n = g.next()
+        except StopIteration:
+            gens.remove(g)
+        else:
+            print n

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/gen-4.py

@@ -0,0 +1,33 @@
+
+class Malfunction(Exception):
+    pass
+
+def my_generator():
+    print 'starting up'
+
+    val = yield 1
+    print 'got:', val
+
+    val = yield 2
+    print 'got:', val
+
+    try:
+        yield 3
+    except Malfunction:
+        print 'malfunction!'
+
+    yield 4
+
+    print 'done'
+
+gen = my_generator()
+
+print gen.next() # start the generator
+print gen.send(10) # send the value 10
+print gen.send(20) # send the value 20
+print gen.throw(Malfunction()) # raise an exception inside the generator
+
+try:
+    gen.next()
+except StopIteration:
+    pass

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/inline-callbacks-1.py

@@ -0,0 +1,32 @@
+
+from twisted.internet.defer import inlineCallbacks, Deferred
+
+@inlineCallbacks
+def my_callbacks():
+    from twisted.internet import reactor
+
+    print 'first callback'
+    result = yield 1 # yielded values that aren't deferred come right back
+
+    print 'second callback got', result
+    d = Deferred()
+    reactor.callLater(5, d.callback, 2)
+    result = yield d # yielded deferreds will pause the generator
+
+    print 'third callback got', result # the result of the deferred
+
+    d = Deferred()
+    reactor.callLater(5, d.errback, Exception(3))
+
+    try:
+        yield d
+    except Exception, e:
+        result = e
+
+    print 'fourth callback got', repr(result) # the exception from the deferred
+
+    reactor.stop()
+
+from twisted.internet import reactor
+reactor.callWhenRunning(my_callbacks)
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/inline-callbacks-2.py

@@ -0,0 +1,66 @@
+
+from twisted.internet.defer import inlineCallbacks, Deferred, returnValue
+
+@inlineCallbacks
+def my_callbacks_1():
+    from twisted.internet import reactor
+
+    print 'my_callbacks_1 first callback'
+    d = Deferred()
+    reactor.callLater(2, d.callback, None)
+    yield d
+
+    print 'my_callbacks_1 second callback'
+    d = Deferred()
+    reactor.callLater(2, d.callback, None)
+    yield d
+
+    print 'my_callbacks_1 third callback'
+    returnValue(1)
+
+@inlineCallbacks
+def my_callbacks_err():
+    from twisted.internet import reactor
+
+    print 'my_callbacks_err first callback'
+    d = Deferred()
+    reactor.callLater(3, d.callback, None)
+    yield d
+
+    print 'my_callbacks_err second callback'
+    d = Deferred()
+    reactor.callLater(3, d.callback, None)
+    yield d
+
+    print 'my_callbacks_err third callback'
+    raise Exception('uh oh')
+
+def got_result(res):
+    print 'got result:', res
+
+def got_error(err):
+    print 'got error:', err
+
+def run_callbacks():
+    d1 = my_callbacks_1()
+    d1.addCallbacks(got_result, got_error)
+
+    d2 = my_callbacks_err()
+    d2.addCallbacks(got_result, got_error)
+
+    from twisted.internet import reactor
+
+    def callbacks_finished(_):
+        callbacks_finished.count += 1
+        if callbacks_finished.count == 2:
+            print 'all done'
+            reactor.stop()
+    callbacks_finished.count = 0
+
+    d1.addBoth(callbacks_finished)
+    d2.addBoth(callbacks_finished)
+
+
+from twisted.internet import reactor
+reactor.callWhenRunning(run_callbacks)
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/inline-callbacks/inline-callbacks-tb.py

@@ -0,0 +1,15 @@
+
+import traceback
+
+from twisted.internet.defer import inlineCallbacks
+
+@inlineCallbacks
+def my_callbacks():
+    yield 1
+    traceback.print_stack()
+    from twisted.internet import reactor
+    reactor.stop()
+
+from twisted.internet import reactor
+reactor.callWhenRunning(my_callbacks)
+reactor.run()

1_7.http_proxy_server/python/twisted-intro-dave/poetry/ecstasy.txt

@@ -0,0 +1,80 @@
+The Ecstasy
+
+Where, like a pillow on a bed
+         A pregnant bank swell'd up to rest
+The violet's reclining head,
+         Sat we two, one another's best.
+Our hands were firmly cemented
+         With a fast balm, which thence did spring;
+Our eye-beams twisted, and did thread
+         Our eyes upon one double string;
+So to'intergraft our hands, as yet
+         Was all the means to make us one,
+And pictures in our eyes to get
+         Was all our propagation.
+As 'twixt two equal armies fate
+         Suspends uncertain victory,
+Our souls (which to advance their state
+         Were gone out) hung 'twixt her and me.
+And whilst our souls negotiate there,
+         We like sepulchral statues lay;
+All day, the same our postures were,
+         And we said nothing, all the day.
+If any, so by love refin'd
+         That he soul's language understood,
+And by good love were grown all mind,
+         Within convenient distance stood,
+He (though he knew not which soul spake,
+         Because both meant, both spake the same)
+Might thence a new concoction take
+         And part far purer than he came.
+This ecstasy doth unperplex,
+         We said, and tell us what we love;
+We see by this it was not sex,
+         We see we saw not what did move;
+But as all several souls contain
+         Mixture of things, they know not what,
+Love these mix'd souls doth mix again
+         And makes both one, each this and that.
+A single violet transplant,
+         The strength, the colour, and the size,
+(All which before was poor and scant)
+         Redoubles still, and multiplies.
+When love with one another so
+         Interinanimates two souls,
+That abler soul, which thence doth flow,
+         Defects of loneliness controls.
+We then, who are this new soul, know
+         Of what we are compos'd and made,
+For th' atomies of which we grow
+         Are souls. whom no change can invade.
+But oh alas, so long, so far,
+         Our bodies why do we forbear?
+They'are ours, though they'are not we; we are
+         The intelligences, they the spheres.
+We owe them thanks, because they thus
+         Did us, to us, at first convey,
+Yielded their senses' force to us,
+         Nor are dross to us, but allay.
+On man heaven's influence works not so,
+         But that it first imprints the air;
+So soul into the soul may flow,
+            Though it to body first repair.
+As our blood labors to beget
+         Spirits, as like souls as it can,
+Because such fingers need to knit
+         That subtle knot which makes us man,
+So must pure lovers' souls descend
+         T' affections, and to faculties,
+Which sense may reach and apprehend,
+         Else a great prince in prison lies.
+To'our bodies turn we then, that so
+         Weak men on love reveal'd may look;
+Love's mysteries in souls do grow,
+         But yet the body is his book.
+And if some lover, such as we,
+         Have heard this dialogue of one,
+Let him still mark us, he shall see
+         Small change, when we'are to bodies gone. 
+
+    -- John Donne

1_7.http_proxy_server/python/twisted-intro-dave/poetry/fascination.txt

@@ -0,0 +1,17 @@
+The Fascination of what's Difficult
+
+The fascination of what's difficult
+Has dried the sap out of my veins, and rent
+Spontaneous joy and natural content
+Out of my heart. There's something ails our colt
+That must, as if it had not holy blood
+Nor on Olympus leaped from cloud to cloud,
+Shiver under the lash, strain, sweat and jolt
+As though it dragged road metal. My curse on plays
+That have to be set up in fifty ways,
+On the day's war with every knave and dolt,
+Theatre business, management of men.
+I swear before the dawn comes round again
+I'll find the stable and pull out the bolt.
+
+    -- William Butler Yeats

1_7.http_proxy_server/python/twisted-intro-dave/poetry/science.txt

@@ -0,0 +1,18 @@
+Sonnet - To Science
+
+Science! true daughter of Old Time thou art!
+Who alterest all things with thy peering eyes.
+Why preyest thou thus upon the poet's heart,
+Vulture, whose wings are dull realities?
+How should he love thee? or how deem thee wise,
+Who wouldst not leave him in his wandering
+To seek for treasure in the jewelled skies,
+Albeit he soared with an undaunted wing?
+Hast thou not dragged Diana from her car?
+And driven the Hamadryad from the wood
+To seek a shelter in some happier star?
+Hast thou not torn the Naiad from her flood,
+The Elfin from the green grass, and from me
+The summer dream beneath the tamarind tree?
+
+    -- Edgar Allen Poe

1_7.http_proxy_server/python/twisted-intro-dave/solutions/README

@@ -0,0 +1,2 @@
+This directory contains my own solutions to some of the exercises.
+I will post more as I have time.

1_7.http_proxy_server/python/twisted-intro-dave/solutions/part-8/number-1/get-poetry.py

@@ -0,0 +1,150 @@
+import optparse, sys
+
+from twisted.internet import defer
+from twisted.internet.protocol import Protocol, ClientFactory
+
+
+class TimeoutError(Exception):
+    pass
+
+
+def parse_args():
+    usage = """usage: %prog [options] [hostname]:port ...
+
+Get Poetry Now!
+
+Run it like this:
+
+  python get-poetry.py port1 port2 port3 ...
+"""
+
+    parser = optparse.OptionParser(usage)
+
+    help = "Timeout in seconds."
+    parser.add_option('-t', '--timeout', type='float', help=help, default=5.0)
+
+    options, addresses = parser.parse_args()
+
+    if not addresses:
+        print parser.format_help()
+        parser.exit()
+
+    def parse_address(addr):
+        if ':' not in addr:
+            host = '127.0.0.1'
+            port = addr
+        else:
+            host, port = addr.split(':', 1)
+
+        if not port.isdigit():
+            parser.error('Ports must be integers.')
+
+        return host, int(port)
+
+    return map(parse_address, addresses), options
+
+
+class PoetryProtocol(Protocol):
+
+    poem = ''
+
+    def dataReceived(self, data):
+        self.poem += data
+
+    def connectionLost(self, reason):
+        self.poemReceived(self.poem)
+
+    def poemReceived(self, poem):
+        self.factory.poem_finished(poem)
+
+
+class PoetryClientFactory(ClientFactory):
+
+    protocol = PoetryProtocol
+
+    def __init__(self, deferred, timeout):
+        self.deferred = deferred
+        self.timeout = timeout
+        self.timeout_call = None
+
+    def startedConnecting(self, connector):
+        from twisted.internet import reactor
+        self.timeout_call = reactor.callLater(self.timeout,
+                                              self.on_timeout,
+                                              connector)
+
+    def poem_finished(self, poem):
+        if self.deferred is not None:
+            d, self.deferred = self.deferred, None
+            d.callback(poem)
+        self.cancel_timeout()
+
+    def clientConnectionFailed(self, connector, reason):
+        if self.deferred is not None:
+            d, self.deferred = self.deferred, None
+            d.errback(reason)
+        self.cancel_timeout()
+
+    def on_timeout(self, connector):
+        self.timeout_call = None
+
+        if self.deferred is not None:
+            d, self.deferred = self.deferred, None
+            d.errback(TimeoutError())
+            connector.disconnect()
+
+    def cancel_timeout(self):
+        if self.timeout_call is not None:
+            call, self.timeout_call = self.timeout_call, None
+            call.cancel()
+
+
+def get_poetry(host, port, timeout):
+    """
+    Download a poem from the given host and port. This function
+    returns a Deferred which will be fired with the complete text of
+    the poem or a Failure if the poem could not be downloaded.
+
+    If timeout seconds elapse before the poem is received, the
+    Deferred will fire with a TimeoutError.
+    """
+    d = defer.Deferred()
+    from twisted.internet import reactor
+    factory = PoetryClientFactory(d, timeout)
+    reactor.connectTCP(host, port, factory)
+    return d
+
+
+def poetry_main():
+    addresses, options = parse_args()
+
+    from twisted.internet import reactor
+
+    poems = []
+    errors = []
+
+    def got_poem(poem):
+        poems.append(poem)
+
+    def poem_failed(err):
+        print >>sys.stderr, 'Poem failed:', err
+        errors.append(err)
+
+    def poem_done(_):
+        if len(poems) + len(errors) == len(addresses):
+            reactor.stop()
+
+    for address in addresses:
+        host, port = address
+        d = get_poetry(host, port, options.timeout)
+        d.addCallbacks(got_poem, poem_failed)
+        d.addBoth(poem_done)
+
+    reactor.run()
+
+    for poem in poems:
+        print poem
+
+
+if __name__ == '__main__':
+    poetry_main()

1_7.http_proxy_server/python/twisted-intro-dave/tests/test_poetry.py

@@ -0,0 +1,95 @@
+from twisted.internet.defer import Deferred
+from twisted.internet.error import ConnectError
+from twisted.internet.protocol import ClientFactory, ServerFactory, Protocol
+from twisted.trial.unittest import TestCase
+
+# Normally we would import the classes we want to test.
+# But to make the examples self-contained, we're just
+# copying them here, with a few modifications.
+
+class PoetryServerProtocol(Protocol):
+
+    def connectionMade(self):
+        self.transport.write(self.factory.poem)
+        self.transport.loseConnection()
+
+class PoetryServerFactory(ServerFactory):
+
+    protocol = PoetryServerProtocol
+
+    def __init__(self, poem):
+        self.poem = poem
+
+
+class PoetryClientProtocol(Protocol):
+
+    poem = ''
+
+    def dataReceived(self, data):
+        self.poem += data
+
+    def connectionLost(self, reason):
+        self.poemReceived(self.poem)
+
+    def poemReceived(self, poem):
+        self.factory.poem_finished(poem)
+
+
+class PoetryClientFactory(ClientFactory):
+
+    protocol = PoetryClientProtocol
+
+    def __init__(self):
+        self.deferred = Deferred()
+
+    def poem_finished(self, poem):
+        if self.deferred is not None:
+            d, self.deferred = self.deferred, None
+            d.callback(poem)
+
+    def clientConnectionFailed(self, connector, reason):
+        if self.deferred is not None:
+            d, self.deferred = self.deferred, None
+            d.errback(reason)
+
+
+def get_poetry(host, port):
+    from twisted.internet import reactor
+    factory = PoetryClientFactory()
+    reactor.connectTCP(host, port, factory)
+    return factory.deferred
+
+
+TEST_POEM = '''\
+This is a test.
+This is only a test.'''
+
+
+class PoetryTestCase(TestCase):
+
+    def setUp(self):
+        factory = PoetryServerFactory(TEST_POEM)
+        from twisted.internet import reactor
+        self.port = reactor.listenTCP(0, factory, interface="127.0.0.1")
+        self.portnum = self.port.getHost().port
+
+    def tearDown(self):
+        port, self.port = self.port, None
+        return port.stopListening()
+
+    def test_client(self):
+        """The correct poem is returned by get_poetry."""
+        d = get_poetry('127.0.0.1', self.portnum)
+
+        def got_poem(poem):
+            self.assertEquals(poem, TEST_POEM)
+
+        d.addCallback(got_poem)
+
+        return d
+
+    def test_failure(self):
+        """The correct failure is returned by get_poetry when
+        connecting to a port with no server."""
+        d = get_poetry('127.0.0.1', 0)
+        return self.assertFailure(d, ConnectError)

1_7.http_proxy_server/python/twisted-intro-dave/twisted-client-1/get-poetry-broken.py

@@ -0,0 +1,134 @@
+# This is the *Broken* Twisted Get Poetry Now! client, version 1.0.
+
+# NOTE: This should not be used as the basis for production code.
+# It uses low-level Twisted APIs as a learning exercise.
+
+# Also, it's totally broken. See the explanation in Part 4
+# to understand why.
+
+import datetime, optparse, socket
+
+from twisted.internet import main
+
+
+def parse_args():
+    usage = """usage: %prog [options] [hostname]:port ...
+
+This is the *Broken* Get Poetry Now! client, Twisted version 1.0.
+Run it like this:
+
+  python get-poetry-broken.py port1 port2 port3 ...
+
+If you are in the base directory of the twisted-intro package,
+you could run it like this:
+
+  python twisted-client-1/get-poetry-broken.py 10001 10002 10003
+
+to grab poetry from servers on ports 10001, 10002, and 10003.
+
+Of course, there need to be servers listening on those ports
+for that to work.
+"""
+
+    parser = optparse.OptionParser(usage)
+
+    _, addresses = parser.parse_args()
+
+    if not addresses:
+        print parser.format_help()
+        parser.exit()
+
+    def parse_address(addr):
+        if ':' not in addr:
+            host = '127.0.0.1'
+            port = addr
+        else:
+            host, port = addr.split(':', 1)
+
+        if not port.isdigit():
+            parser.error('Ports must be integers.')
+
+        return host, int(port)
+
+    return map(parse_address, addresses)
+
+
+class PoetrySocket(object):
+
+    poem = ''
+
+    def __init__(self, task_num, address):
+        self.task_num = task_num
+        self.address = address
+        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.sock.connect(address)
+        #self.sock.setblocking(0) we don't set non-blocking -- broken!
+
+        # tell the Twisted reactor to monitor this socket for reading
+        from twisted.internet import reactor
+        reactor.addReader(self)
+
+    def fileno(self):
+        try:
+            return self.sock.fileno()
+        except socket.error:
+            return -1
+
+    def connectionLost(self, reason):
+        self.sock.close()
+
+        # stop monitoring this socket
+        from twisted.internet import reactor
+        reactor.removeReader(self)
+
+        # see if there are any poetry sockets left
+        for reader in reactor.getReaders():
+            if isinstance(reader, PoetrySocket):
+                return
+
+        reactor.stop() # no more poetry
+
+    def doRead(self):
+        poem = ''
+
+        while True: # we're just reading everything (blocking) -- broken!
+            bytes = self.sock.recv(1024)
+            if not bytes:
+                break
+            poem += bytes
+
+        msg = 'Task %d: got %d bytes of poetry from %s'
+        print  msg % (self.task_num, len(poem), self.format_addr())
+
+        self.poem = poem
+
+        return main.CONNECTION_DONE
+
+    def logPrefix(self):
+        return 'poetry'
+
+    def format_addr(self):
+        host, port = self.address
+        return '%s:%s' % (host or '127.0.0.1', port)
+
+
+def poetry_main():
+    addresses = parse_args()
+
+    start = datetime.datetime.now()
+
+    sockets = [PoetrySocket(i + 1, addr) for i, addr in enumerate(addresses)]
+
+    from twisted.internet import reactor
+    reactor.run()
+
+    elapsed = datetime.datetime.now() - start
+
+    for i, sock in enumerate(sockets):
+        print 'Task %d: %d bytes of poetry' % (i + 1, len(sock.poem))
+
+    print 'Got %d poems in %s' % (len(addresses), elapsed)
+
+
+if __name__ == '__main__':
+    poetry_main()