/usr/share/pyshared/swift/common/wsgi.py is in python-swift 1.4.8-0ubuntu2.5.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""WSGI tools for use with swift."""
import errno
import os
import signal
import time
import mimetools
import eventlet
from eventlet import greenio, GreenPool, sleep, wsgi, listen
from paste.deploy import loadapp, appconfig
from eventlet.green import socket, ssl
from webob import Request
from swift.common.utils import get_logger, drop_privileges, \
validate_configuration, capture_stdio, NullLogger
def monkey_patch_mimetools():
"""
mimetools.Message defaults content-type to "text/plain"
This changes it to default to None, so we can detect missing headers.
"""
orig_parsetype = mimetools.Message.parsetype
def parsetype(self):
if not self.typeheader:
self.type = None
self.maintype = None
self.subtype = None
self.plisttext = ''
else:
orig_parsetype(self)
mimetools.Message.parsetype = parsetype
def get_socket(conf, default_port=8080):
"""Bind socket to bind ip:port in conf
:param conf: Configuration dict to read settings from
:param default_port: port to use if not specified in conf
:returns : a socket object as returned from socket.listen or
ssl.wrap_socket if conf specifies cert_file
"""
bind_addr = (conf.get('bind_ip', '0.0.0.0'),
int(conf.get('bind_port', default_port)))
address_family = [addr[0] for addr in socket.getaddrinfo(bind_addr[0],
bind_addr[1], socket.AF_UNSPEC, socket.SOCK_STREAM)
if addr[0] in (socket.AF_INET, socket.AF_INET6)][0]
sock = None
retry_until = time.time() + 30
while not sock and time.time() < retry_until:
try:
sock = listen(bind_addr, backlog=int(conf.get('backlog', 4096)),
family=address_family)
if 'cert_file' in conf:
sock = ssl.wrap_socket(sock, certfile=conf['cert_file'],
keyfile=conf['key_file'])
except socket.error, err:
if err.args[0] != errno.EADDRINUSE:
raise
sleep(0.1)
if not sock:
raise Exception('Could not bind to %s:%s after trying for 30 seconds' %
bind_addr)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# in my experience, sockets can hang around forever without keepalive
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 600)
return sock
# TODO: pull pieces of this out to test
def run_wsgi(conf_file, app_section, *args, **kwargs):
"""
Loads common settings from conf, then instantiates app and runs
the server using the specified number of workers.
:param conf_file: Path to paste.deploy style configuration file
:param app_section: App name from conf file to load config from
"""
try:
conf = appconfig('config:%s' % conf_file, name=app_section)
except Exception, e:
print "Error trying to load config %s: %s" % (conf_file, e)
return
validate_configuration()
# pre-configure logger
log_name = conf.get('log_name', app_section)
if 'logger' in kwargs:
logger = kwargs.pop('logger')
else:
logger = get_logger(conf, log_name,
log_to_console=kwargs.pop('verbose', False), log_route='wsgi')
# bind to address and port
sock = get_socket(conf, default_port=kwargs.get('default_port', 8080))
# remaining tasks should not require elevated privileges
drop_privileges(conf.get('user', 'swift'))
# Ensure the application can be loaded before proceeding.
loadapp('config:%s' % conf_file, global_conf={'log_name': log_name})
# redirect errors to logger and close stdio
capture_stdio(logger)
def run_server():
wsgi.HttpProtocol.default_request_version = "HTTP/1.0"
# Turn off logging requests by the underlying WSGI software.
wsgi.HttpProtocol.log_request = lambda *a: None
# Redirect logging other messages by the underlying WSGI software.
wsgi.HttpProtocol.log_message = \
lambda s, f, *a: logger.error('ERROR WSGI: ' + f % a)
wsgi.WRITE_TIMEOUT = int(conf.get('client_timeout') or 60)
eventlet.hubs.use_hub('poll')
eventlet.patcher.monkey_patch(all=False, socket=True)
monkey_patch_mimetools()
app = loadapp('config:%s' % conf_file,
global_conf={'log_name': log_name})
pool = GreenPool(size=1024)
try:
wsgi.server(sock, app, NullLogger(), custom_pool=pool)
except socket.error, err:
if err[0] != errno.EINVAL:
raise
pool.waitall()
worker_count = int(conf.get('workers', '1'))
# Useful for profiling [no forks].
if worker_count == 0:
run_server()
return
def kill_children(*args):
"""Kills the entire process group."""
logger.error('SIGTERM received')
signal.signal(signal.SIGTERM, signal.SIG_IGN)
running[0] = False
os.killpg(0, signal.SIGTERM)
def hup(*args):
"""Shuts down the server, but allows running requests to complete"""
logger.error('SIGHUP received')
signal.signal(signal.SIGHUP, signal.SIG_IGN)
running[0] = False
running = [True]
signal.signal(signal.SIGTERM, kill_children)
signal.signal(signal.SIGHUP, hup)
children = []
while running[0]:
while len(children) < worker_count:
pid = os.fork()
if pid == 0:
signal.signal(signal.SIGHUP, signal.SIG_DFL)
signal.signal(signal.SIGTERM, signal.SIG_DFL)
run_server()
logger.notice('Child %d exiting normally' % os.getpid())
return
else:
logger.notice('Started child %s' % pid)
children.append(pid)
try:
pid, status = os.wait()
if os.WIFEXITED(status) or os.WIFSIGNALED(status):
logger.error('Removing dead child %s' % pid)
children.remove(pid)
except OSError, err:
if err.errno not in (errno.EINTR, errno.ECHILD):
raise
except KeyboardInterrupt:
logger.notice('User quit')
break
greenio.shutdown_safe(sock)
sock.close()
logger.notice('Exited')
def make_pre_authed_request(env, method, path, body=None, headers=None,
agent='Swift'):
"""
Makes a new webob.Request based on the current env but with the
parameters specified. Note that this request will be preauthorized.
:param env: Current WSGI environment dictionary
:param method: HTTP method of new request
:param path: HTTP path of new request
:param body: HTTP body of new request; None by default
:param headers: Extra HTTP headers of new request; None by default
:returns: webob.Request object
(Stolen from Swauth: https://github.com/gholt/swauth)
"""
newenv = {'REQUEST_METHOD': method, 'HTTP_USER_AGENT': agent}
for name in ('swift.cache', 'swift.trans_id'):
if name in env:
newenv[name] = env[name]
newenv['swift.authorize'] = lambda req: None
if not headers:
headers = {}
if body:
return Request.blank(path, environ=newenv, body=body,
headers=headers)
else:
return Request.blank(path, environ=newenv, headers=headers)
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