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# Copyright (c) 2010-2012 OpenStack, LLC.
#
# 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.
# NOTE: swift_conn
# You'll see swift_conn passed around a few places in this file. This is the
# source httplib connection of whatever it is attached to.
# It is used when early termination of reading from the connection should
# happen, such as when a range request is satisfied but there's still more the
# source connection would like to send. To prevent having to read all the data
# that could be left, the source connection can be .close() and then reads
# commence to empty out any buffers.
# These shenanigans are to ensure all related objects can be garbage
# collected. We've seen objects hang around forever otherwise.
import mimetypes
import os
import time
from ConfigParser import ConfigParser
import uuid
from eventlet import Timeout
from swift.common.ring import Ring
from swift.common.utils import cache_from_env, get_logger, \
get_remote_client, split_path, config_true_value
from swift.common.constraints import check_utf8
from swift.proxy.controllers import AccountController, ObjectController, \
ContainerController, Controller
from swift.common.swob import HTTPAccepted, HTTPBadRequest, HTTPForbidden, \
HTTPMethodNotAllowed, HTTPNotFound, HTTPPreconditionFailed, \
HTTPRequestEntityTooLarge, HTTPRequestTimeout, HTTPServerError, \
HTTPServiceUnavailable, HTTPClientDisconnect, status_map, Request, Response
class Application(object):
"""WSGI application for the proxy server."""
def __init__(self, conf, memcache=None, logger=None, account_ring=None,
container_ring=None, object_ring=None):
if conf is None:
conf = {}
if logger is None:
self.logger = get_logger(conf, log_route='proxy-server')
else:
self.logger = logger
swift_dir = conf.get('swift_dir', '/etc/swift')
self.node_timeout = int(conf.get('node_timeout', 10))
self.conn_timeout = float(conf.get('conn_timeout', 0.5))
self.client_timeout = int(conf.get('client_timeout', 60))
self.put_queue_depth = int(conf.get('put_queue_depth', 10))
self.object_chunk_size = int(conf.get('object_chunk_size', 65536))
self.client_chunk_size = int(conf.get('client_chunk_size', 65536))
self.error_suppression_interval = \
int(conf.get('error_suppression_interval', 60))
self.error_suppression_limit = \
int(conf.get('error_suppression_limit', 10))
self.recheck_container_existence = \
int(conf.get('recheck_container_existence', 60))
self.recheck_account_existence = \
int(conf.get('recheck_account_existence', 60))
self.allow_account_management = \
config_true_value(conf.get('allow_account_management', 'no'))
self.object_post_as_copy = \
config_true_value(conf.get('object_post_as_copy', 'true'))
self.resellers_conf = ConfigParser()
self.resellers_conf.read(os.path.join(swift_dir, 'resellers.conf'))
self.object_ring = object_ring or Ring(swift_dir, ring_name='object')
self.container_ring = container_ring or Ring(swift_dir,
ring_name='container')
self.account_ring = account_ring or Ring(swift_dir,
ring_name='account')
self.memcache = memcache
mimetypes.init(mimetypes.knownfiles +
[os.path.join(swift_dir, 'mime.types')])
self.account_autocreate = \
config_true_value(conf.get('account_autocreate', 'no'))
self.expiring_objects_account = \
(conf.get('auto_create_account_prefix') or '.') + \
'expiring_objects'
self.expiring_objects_container_divisor = \
int(conf.get('expiring_objects_container_divisor') or 86400)
self.max_containers_per_account = \
int(conf.get('max_containers_per_account') or 0)
self.max_containers_whitelist = [
a.strip()
for a in conf.get('max_containers_whitelist', '').split(',')
if a.strip()]
self.deny_host_headers = [
host.strip() for host in
conf.get('deny_host_headers', '').split(',') if host.strip()]
self.rate_limit_after_segment = \
int(conf.get('rate_limit_after_segment', 10))
self.rate_limit_segments_per_sec = \
int(conf.get('rate_limit_segments_per_sec', 1))
self.log_handoffs = config_true_value(conf.get('log_handoffs', 'true'))
self.cors_allow_origin = [
a.strip()
for a in conf.get('cors_allow_origin', '').split(',')
if a.strip()]
def get_controller(self, path):
"""
Get the controller to handle a request.
:param path: path from request
:returns: tuple of (controller class, path dictionary)
:raises: ValueError (thrown by split_path) if given invalid path
"""
version, account, container, obj = split_path(path, 1, 4, True)
d = dict(version=version,
account_name=account,
container_name=container,
object_name=obj)
if obj and container and account:
return ObjectController, d
elif container and account:
return ContainerController, d
elif account and not container and not obj:
return AccountController, d
return None, d
def __call__(self, env, start_response):
"""
WSGI entry point.
Wraps env in swob.Request object and passes it down.
:param env: WSGI environment dictionary
:param start_response: WSGI callable
"""
try:
if self.memcache is None:
self.memcache = cache_from_env(env)
req = self.update_request(Request(env))
return self.handle_request(req)(env, start_response)
except UnicodeError:
err = HTTPPreconditionFailed(
request=req, body='Invalid UTF8 or contains NULL')
return err(env, start_response)
except (Exception, Timeout):
start_response('500 Server Error',
[('Content-Type', 'text/plain')])
return ['Internal server error.\n']
def update_request(self, req):
if 'x-storage-token' in req.headers and \
'x-auth-token' not in req.headers:
req.headers['x-auth-token'] = req.headers['x-storage-token']
return req
def handle_request(self, req):
"""
Entry point for proxy server.
Should return a WSGI-style callable (such as swob.Response).
:param req: swob.Request object
"""
try:
self.logger.set_statsd_prefix('proxy-server')
if req.content_length and req.content_length < 0:
self.logger.increment('errors')
return HTTPBadRequest(request=req,
body='Invalid Content-Length')
try:
if not check_utf8(req.path_info):
self.logger.increment('errors')
return HTTPPreconditionFailed(
request=req, body='Invalid UTF8 or contains NULL')
except UnicodeError:
self.logger.increment('errors')
return HTTPPreconditionFailed(
request=req, body='Invalid UTF8 or contains NULL')
try:
controller, path_parts = self.get_controller(req.path)
p = req.path_info
if isinstance(p, unicode):
p = p.encode('utf-8')
except ValueError:
self.logger.increment('errors')
return HTTPNotFound(request=req)
if not controller:
self.logger.increment('errors')
return HTTPPreconditionFailed(request=req, body='Bad URL')
if self.deny_host_headers and \
req.host.split(':')[0] in self.deny_host_headers:
return HTTPForbidden(request=req, body='Invalid host header')
self.logger.set_statsd_prefix('proxy-server.' +
controller.server_type.lower())
controller = controller(self, **path_parts)
if 'swift.trans_id' not in req.environ:
# if this wasn't set by an earlier middleware, set it now
trans_id = 'tx' + uuid.uuid4().hex
req.environ['swift.trans_id'] = trans_id
self.logger.txn_id = trans_id
req.headers['x-trans-id'] = req.environ['swift.trans_id']
controller.trans_id = req.environ['swift.trans_id']
self.logger.client_ip = get_remote_client(req)
try:
handler = getattr(controller, req.method)
getattr(handler, 'publicly_accessible')
except AttributeError:
allowed_methods = getattr(controller, 'allowed_methods', set())
return HTTPMethodNotAllowed(
request=req, headers={'Allow': ', '.join(allowed_methods)})
if path_parts['version']:
req.path_info_pop()
if 'swift.authorize' in req.environ:
# We call authorize before the handler, always. If authorized,
# we remove the swift.authorize hook so isn't ever called
# again. If not authorized, we return the denial unless the
# controller's method indicates it'd like to gather more
# information and try again later.
resp = req.environ['swift.authorize'](req)
if not resp:
# No resp means authorized, no delayed recheck required.
del req.environ['swift.authorize']
else:
# Response indicates denial, but we might delay the denial
# and recheck later. If not delayed, return the error now.
if not getattr(handler, 'delay_denial', None):
return resp
# Save off original request method (GET, POST, etc.) in case it
# gets mutated during handling. This way logging can display the
# method the client actually sent.
req.environ['swift.orig_req_method'] = req.method
return handler(req)
except (Exception, Timeout):
self.logger.exception(_('ERROR Unhandled exception in request'))
return HTTPServerError(request=req)
def app_factory(global_conf, **local_conf):
"""paste.deploy app factory for creating WSGI proxy apps."""
conf = global_conf.copy()
conf.update(local_conf)
return Application(conf)
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