# Copyright (c) 2010, Philip Plante of EndlessPaths.com | |
# | |
# 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. | |
import logging | |
import shlex | |
import subprocess | |
import tornado | |
class AsyncProcessMixIn(tornado.web.RequestHandler): | |
""" | |
class SampleHandler(AsyncProcessMixIn): | |
@tornado.web.asynchronous | |
def get(self): | |
self.call_subprocess('ls /', self.on_ls) | |
def on_ls(self, output, return_code): | |
self.write("return code is: %d" % (return_code,)) | |
self.write("output is:\n%s" % (output.read(),)) # output is a file-like object returned by subprocess.Popen | |
self.finish() | |
""" | |
def call_subprocess(self, command, callback=None): | |
self.ioloop = tornado.ioloop.IOLoop.instance() | |
self.pipe = p = subprocess.Popen(shlex.split(command), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True) | |
self.ioloop.add_handler(p.stdout.fileno(), self.async_callback(self.on_subprocess_result, callback), self.ioloop.READ) | |
def on_subprocess_result(self, callback, fd, result): | |
try: | |
if callback: | |
callback(self.pipe.stdout) | |
except Exception, e: | |
logging.error(e) | |
finally: | |
self.ioloop.remove_handler(fd) |
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