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#!/usr/bin/env python
# encoding: utf8
#
# Copyright © Burak Arslan <burak at arskom dot com dot tr>,
# Arskom Ltd. http://www.arskom.com.tr
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the owner nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
"""This is a blocking example running in a single-process twisted setup.
In this example, user code runs directly in the reactor loop. So unless your
code fully adheres to the asynchronous programming principles, you can block
the reactor loop. ::
$ time curl -s "http://localhost:9757/block?seconds=10" > /dev/null & \
time curl -s "http://localhost:9757/block?seconds=10" > /dev/null &
[1] 27559
[2] 27560
real 0m10.026s
user 0m0.005s
sys 0m0.008s
real 0m20.045s
user 0m0.009s
sys 0m0.005s
If you call sleep, it sleeps by returning a deferred: ::
$ time curl -s "http://localhost:9757/sleep?seconds=10" > /dev/null & \
time curl -s "http://localhost:9757/sleep?seconds=10" > /dev/null &
[1] 27778
[2] 27779
real 0m10.012s
user 0m0.000s
sys 0m0.000s
real 0m10.013s
user 0m0.000s
sys 0m0.000s
"""
import sys
import time
import logging
from twisted.internet import reactor
from twisted.web.server import Site
from twisted.internet.task import deferLater
from twisted.python import log
from spyne import Unicode, Integer, Double, ByteArray, Iterable, rpc, \
Service, Application
from spyne.server.twisted import TwistedWebResource
from spyne.protocol.http import HttpRpc
HOST = '0.0.0.0'
PORT = 9758
class SomeService(Service):
@rpc(Integer, _returns=Integer)
def block(ctx, seconds):
"""Blocks the current thread for given number of seconds."""
time.sleep(seconds)
return seconds
class SomeNonBlockingService(Service):
@rpc(Integer, _returns=Unicode)
def sleep(ctx, seconds):
"""Waits without blocking reactor for given number of seconds by
returning a deferred."""
def _cb():
return "slept for %r seconds" % seconds
return deferLater(reactor, seconds, _cb)
@rpc(Unicode, Double, Double, _returns=ByteArray)
def say_hello_with_sleep(ctx, name, times, seconds):
"""Sends multiple hello messages by waiting given number of seconds
inbetween."""
times = [times] # Workaround for Python 2's lacking of nonlocal
def _cb(response):
if times[0] > 0:
msg = u"Hello %s, sleeping for %f seconds for " \
u"%d more time(s)." % (name, seconds, times[0])
response.append(msg.encode('utf8'))
response.append(b'\n')
logging.debug(msg)
times[0] -= 1
return deferLater(reactor, seconds, _cb, response)
return Iterable.Push(_cb)
def initialize(services, tns='spyne.examples.twisted.resource'):
logging.basicConfig(level=logging.DEBUG)
logging.getLogger('spyne.protocol.xml').setLevel(logging.DEBUG)
observer = log.PythonLoggingObserver('twisted')
log.startLoggingWithObserver(observer.emit, setStdout=False)
return Application(services, 'spyne.examples.twisted.hello',
in_protocol=HttpRpc(), out_protocol=HttpRpc())
if __name__=='__main__':
application = initialize([SomeService, SomeNonBlockingService])
resource = TwistedWebResource(application)
site = Site(resource)
reactor.listenTCP(PORT, site, interface=HOST)
logging.info("listening on: %s:%d" % (HOST,PORT))
logging.info('wsdl is at: http://%s:%d/?wsdl' % (HOST, PORT))
sys.exit(reactor.run())
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