Synnefo

# -*- coding: utf-8 -

#

# Copyright 2013 GRNET S.A. 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.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A OR

# CONTRIBUTORS 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.

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# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from __future__ import with_statement

import os

import sys

from datetime import datetime

# workaround on osx, disable kqueue

if sys.platform == "darwin":

    os.environ['EVENT_NOKQUEUE'] = "1"

try:

    import gevent

except ImportError:

    raise RuntimeError("You need gevent installed to use this worker.")

from gevent.pool import Pool

from gevent.server import StreamServer

from gevent import pywsgi

from gevent import select

import gunicorn

from gunicorn.workers.async import AsyncWorker

VERSION = "gevent/%s gunicorn/%s" % (gevent.__version__, gunicorn.__version__)

BASE_WSGI_ENV = {

    'GATEWAY_INTERFACE': 'CGI/1.1',

    'SERVER_SOFTWARE': VERSION,

    'SCRIPT_NAME': '',

    'wsgi.version': (1, 0),

    'wsgi.multithread': False,

    'wsgi.multiprocess': False,

    'wsgi.run_once': False

}

class GeventArchipelagoWorker(AsyncWorker):

    server_class = None

    wsgi_handler = None

    def __init__(self, *args, **kwargs):

        super(GeventArchipelagoWorker, self).__init__(*args, **kwargs)

        self.worker_id = args[0]

    @classmethod

    def setup(cls):

        from gevent import monkey

        monkey.noisy = False

        monkey.patch_all()

    def timeout_ctx(self):

        return gevent.Timeout(self.cfg.keepalive, False)

    def run(self):

        self.socket.setblocking(1)

        pool = Pool(self.worker_connections)

        if self.server_class is not None:

            server = self.server_class(

                self.socket, application=self.wsgi, spawn=pool, log=self.log,

                handler_class=self.wsgi_handler)

        else:

            server = StreamServer(self.socket, handle=self.handle, spawn=pool)

        server.start()

        try:

            while self.alive:

                self.notify()

                if self.ppid != os.getppid():

                    self.log.info("Parent changed, shutting down: %s", self)

                    break

                gevent.sleep(1.0)

        except KeyboardInterrupt:

            pass

        try:

            # Try to stop connections until timeout

            self.notify()

            server.stop(timeout=self.cfg.graceful_timeout)

        except:

            pass

    def handle_request(self, *args):

        try:

            super(GeventArchipelagoWorker, self).handle_request(*args)

        except gevent.GreenletExit:

            pass

    if gevent.version_info[0] == 0:

        def init_process(self):

            #gevent 0.13 and older doesn't reinitialize dns for us after

            #forking here's the workaround

            import gevent.core

            gevent.core.dns_shutdown(fail_requests=1)

            gevent.core.dns_init()

            super(GeventArchipelagoWorker, self).init_process()

class GeventResponse(object):

    status = None

    headers = None

    response_length = None

    def __init__(self, status, headers, clength):

        self.status = status

        self.headers = headers

        self.response_length = clength

class PyWSGIHandler(pywsgi.WSGIHandler):

    def log_request(self):

        start = datetime.fromtimestamp(self.time_start)

        finish = datetime.fromtimestamp(self.time_finish)

        response_time = finish - start

        resp = GeventResponse(self.status, self.response_headers,

                              self.response_length)

        req_headers = [h.split(":", 1) for h in self.headers.headers]

        self.server.log.access(resp, req_headers, self.environ, response_time)

    def get_environ(self):

        env = super(PyWSGIHandler, self).get_environ()

        env['gunicorn.sock'] = self.socket

        env['RAW_URI'] = self.path

        return env

class PyWSGIServer(pywsgi.WSGIServer):

    base_env = BASE_WSGI_ENV

class GeventPyWSGIWorker(GeventArchipelagoWorker):

    "The Gevent StreamServer based workers."

    server_class = PyWSGIServer

    wsgi_handler = PyWSGIHandler