c4a2313f45
By moving the blocking to gatekeeper from the proxy server, we gain the ability to pass X-Backend headers in via InternalClient while still keeping real clients from using them. I wanted this functionality while working on storage policies; I had an InternalClient and wanted to tell it to use a specific policy index instead of what the container said, and that seemed like a good time for an X-Backend header. Change-Id: I4089e980d3cfca660365c7df799723b1f16ba277
555 lines
24 KiB
Python
555 lines
24 KiB
Python
# Copyright (c) 2010-2012 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import mimetypes
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import os
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import socket
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from swift import gettext_ as _
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from random import shuffle
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from time import time
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import itertools
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from eventlet import Timeout
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from swift import __canonical_version__ as swift_version
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from swift.common import constraints
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from swift.common.ring import Ring
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from swift.common.utils import cache_from_env, get_logger, \
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get_remote_client, split_path, config_true_value, generate_trans_id, \
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affinity_key_function, affinity_locality_predicate, list_from_csv, \
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register_swift_info
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from swift.common.constraints import check_utf8
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from swift.proxy.controllers import AccountController, ObjectController, \
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ContainerController, InfoController
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from swift.common.swob import HTTPBadRequest, HTTPForbidden, \
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HTTPMethodNotAllowed, HTTPNotFound, HTTPPreconditionFailed, \
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HTTPServerError, HTTPException, Request
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# List of entry points for mandatory middlewares.
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#
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# Fields:
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#
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# "name" (required) is the entry point name from setup.py.
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#
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# "after_fn" (optional) a function that takes a PipelineWrapper object as its
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# single argument and returns a list of middlewares that this middleware
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# should come after. Any middlewares in the returned list that are not present
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# in the pipeline will be ignored, so you can safely name optional middlewares
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# to come after. For example, ["catch_errors", "bulk"] would install this
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# middleware after catch_errors and bulk if both were present, but if bulk
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# were absent, would just install it after catch_errors.
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required_filters = [
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{'name': 'catch_errors'},
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{'name': 'gatekeeper',
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'after_fn': lambda pipe: (['catch_errors']
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if pipe.startswith("catch_errors")
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else [])},
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{'name': 'dlo', 'after_fn': lambda _junk: ['catch_errors', 'gatekeeper',
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'proxy_logging']}]
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class Application(object):
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"""WSGI application for the proxy server."""
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def __init__(self, conf, memcache=None, logger=None, account_ring=None,
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container_ring=None, object_ring=None):
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if conf is None:
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conf = {}
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if logger is None:
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self.logger = get_logger(conf, log_route='proxy-server')
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else:
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self.logger = logger
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swift_dir = conf.get('swift_dir', '/etc/swift')
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self.node_timeout = int(conf.get('node_timeout', 10))
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self.recoverable_node_timeout = int(
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conf.get('recoverable_node_timeout', self.node_timeout))
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self.conn_timeout = float(conf.get('conn_timeout', 0.5))
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self.client_timeout = int(conf.get('client_timeout', 60))
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self.put_queue_depth = int(conf.get('put_queue_depth', 10))
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self.object_chunk_size = int(conf.get('object_chunk_size', 65536))
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self.client_chunk_size = int(conf.get('client_chunk_size', 65536))
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self.trans_id_suffix = conf.get('trans_id_suffix', '')
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self.post_quorum_timeout = float(conf.get('post_quorum_timeout', 0.5))
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self.error_suppression_interval = \
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int(conf.get('error_suppression_interval', 60))
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self.error_suppression_limit = \
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int(conf.get('error_suppression_limit', 10))
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self.recheck_container_existence = \
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int(conf.get('recheck_container_existence', 60))
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self.recheck_account_existence = \
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int(conf.get('recheck_account_existence', 60))
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self.allow_account_management = \
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config_true_value(conf.get('allow_account_management', 'no'))
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self.object_post_as_copy = \
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config_true_value(conf.get('object_post_as_copy', 'true'))
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self.object_ring = object_ring or Ring(swift_dir, ring_name='object')
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self.container_ring = container_ring or Ring(swift_dir,
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ring_name='container')
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self.account_ring = account_ring or Ring(swift_dir,
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ring_name='account')
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self.memcache = memcache
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mimetypes.init(mimetypes.knownfiles +
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[os.path.join(swift_dir, 'mime.types')])
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self.account_autocreate = \
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config_true_value(conf.get('account_autocreate', 'no'))
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self.expiring_objects_account = \
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(conf.get('auto_create_account_prefix') or '.') + \
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(conf.get('expiring_objects_account_name') or 'expiring_objects')
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self.expiring_objects_container_divisor = \
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int(conf.get('expiring_objects_container_divisor') or 86400)
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self.max_containers_per_account = \
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int(conf.get('max_containers_per_account') or 0)
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self.max_containers_whitelist = [
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a.strip()
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for a in conf.get('max_containers_whitelist', '').split(',')
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if a.strip()]
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self.deny_host_headers = [
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host.strip() for host in
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conf.get('deny_host_headers', '').split(',') if host.strip()]
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self.rate_limit_after_segment = \
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int(conf.get('rate_limit_after_segment', 10))
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self.rate_limit_segments_per_sec = \
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int(conf.get('rate_limit_segments_per_sec', 1))
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self.log_handoffs = config_true_value(conf.get('log_handoffs', 'true'))
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self.cors_allow_origin = [
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a.strip()
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for a in conf.get('cors_allow_origin', '').split(',')
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if a.strip()]
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self.strict_cors_mode = config_true_value(
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conf.get('strict_cors_mode', 't'))
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self.node_timings = {}
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self.timing_expiry = int(conf.get('timing_expiry', 300))
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self.sorting_method = conf.get('sorting_method', 'shuffle').lower()
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self.max_large_object_get_time = float(
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conf.get('max_large_object_get_time', '86400'))
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value = conf.get('request_node_count', '2 * replicas').lower().split()
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if len(value) == 1:
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value = int(value[0])
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self.request_node_count = lambda replicas: value
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elif len(value) == 3 and value[1] == '*' and value[2] == 'replicas':
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value = int(value[0])
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self.request_node_count = lambda replicas: value * replicas
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else:
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raise ValueError(
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'Invalid request_node_count value: %r' % ''.join(value))
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try:
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self._read_affinity = read_affinity = conf.get('read_affinity', '')
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self.read_affinity_sort_key = affinity_key_function(read_affinity)
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except ValueError as err:
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# make the message a little more useful
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raise ValueError("Invalid read_affinity value: %r (%s)" %
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(read_affinity, err.message))
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try:
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write_affinity = conf.get('write_affinity', '')
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self.write_affinity_is_local_fn \
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= affinity_locality_predicate(write_affinity)
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except ValueError as err:
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# make the message a little more useful
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raise ValueError("Invalid write_affinity value: %r (%s)" %
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(write_affinity, err.message))
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value = conf.get('write_affinity_node_count',
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'2 * replicas').lower().split()
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if len(value) == 1:
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value = int(value[0])
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self.write_affinity_node_count = lambda replicas: value
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elif len(value) == 3 and value[1] == '*' and value[2] == 'replicas':
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value = int(value[0])
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self.write_affinity_node_count = lambda replicas: value * replicas
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else:
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raise ValueError(
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'Invalid write_affinity_node_count value: %r' % ''.join(value))
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# swift_owner_headers are stripped by the account and container
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# controllers; we should extend header stripping to object controller
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# when a privileged object header is implemented.
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swift_owner_headers = conf.get(
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'swift_owner_headers',
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'x-container-read, x-container-write, '
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'x-container-sync-key, x-container-sync-to, '
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'x-account-meta-temp-url-key, x-account-meta-temp-url-key-2, '
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'x-account-access-control')
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self.swift_owner_headers = [
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name.strip().title()
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for name in swift_owner_headers.split(',') if name.strip()]
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# Initialization was successful, so now apply the client chunk size
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# parameter as the default read / write buffer size for the network
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# sockets.
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#
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# NOTE WELL: This is a class setting, so until we get set this on a
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# per-connection basis, this affects reading and writing on ALL
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# sockets, those between the proxy servers and external clients, and
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# those between the proxy servers and the other internal servers.
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#
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# ** Because it affects the client as well, currently, we use the
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# client chunk size as the govenor and not the object chunk size.
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socket._fileobject.default_bufsize = self.client_chunk_size
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self.expose_info = config_true_value(
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conf.get('expose_info', 'yes'))
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self.disallowed_sections = list_from_csv(
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conf.get('disallowed_sections'))
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self.admin_key = conf.get('admin_key', None)
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register_swift_info(
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version=swift_version,
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max_file_size=constraints.MAX_FILE_SIZE,
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max_meta_name_length=constraints.MAX_META_NAME_LENGTH,
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max_meta_value_length=constraints.MAX_META_VALUE_LENGTH,
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max_meta_count=constraints.MAX_META_COUNT,
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account_listing_limit=constraints.ACCOUNT_LISTING_LIMIT,
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container_listing_limit=constraints.CONTAINER_LISTING_LIMIT,
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max_account_name_length=constraints.MAX_ACCOUNT_NAME_LENGTH,
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max_container_name_length=constraints.MAX_CONTAINER_NAME_LENGTH,
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max_object_name_length=constraints.MAX_OBJECT_NAME_LENGTH,
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strict_cors_mode=self.strict_cors_mode)
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def check_config(self):
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"""
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Check the configuration for possible errors
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"""
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if self._read_affinity and self.sorting_method != 'affinity':
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self.logger.warn("sorting_method is set to '%s', not 'affinity'; "
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"read_affinity setting will have no effect." %
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self.sorting_method)
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def get_controller(self, path):
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"""
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Get the controller to handle a request.
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:param path: path from request
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:returns: tuple of (controller class, path dictionary)
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:raises: ValueError (thrown by split_path) if given invalid path
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"""
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if path == '/info':
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d = dict(version=None,
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expose_info=self.expose_info,
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disallowed_sections=self.disallowed_sections,
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admin_key=self.admin_key)
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return InfoController, d
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version, account, container, obj = split_path(path, 1, 4, True)
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d = dict(version=version,
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account_name=account,
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container_name=container,
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object_name=obj)
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if obj and container and account:
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return ObjectController, d
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elif container and account:
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return ContainerController, d
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elif account and not container and not obj:
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return AccountController, d
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return None, d
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def __call__(self, env, start_response):
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"""
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WSGI entry point.
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Wraps env in swob.Request object and passes it down.
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:param env: WSGI environment dictionary
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:param start_response: WSGI callable
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"""
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try:
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if self.memcache is None:
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self.memcache = cache_from_env(env)
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req = self.update_request(Request(env))
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return self.handle_request(req)(env, start_response)
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except UnicodeError:
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err = HTTPPreconditionFailed(
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request=req, body='Invalid UTF8 or contains NULL')
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return err(env, start_response)
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except (Exception, Timeout):
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start_response('500 Server Error',
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[('Content-Type', 'text/plain')])
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return ['Internal server error.\n']
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def update_request(self, req):
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if 'x-storage-token' in req.headers and \
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'x-auth-token' not in req.headers:
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req.headers['x-auth-token'] = req.headers['x-storage-token']
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return req
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def handle_request(self, req):
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"""
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Entry point for proxy server.
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Should return a WSGI-style callable (such as swob.Response).
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:param req: swob.Request object
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"""
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try:
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self.logger.set_statsd_prefix('proxy-server')
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if req.content_length and req.content_length < 0:
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self.logger.increment('errors')
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return HTTPBadRequest(request=req,
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body='Invalid Content-Length')
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try:
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if not check_utf8(req.path_info):
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self.logger.increment('errors')
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return HTTPPreconditionFailed(
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request=req, body='Invalid UTF8 or contains NULL')
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except UnicodeError:
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self.logger.increment('errors')
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return HTTPPreconditionFailed(
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request=req, body='Invalid UTF8 or contains NULL')
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try:
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controller, path_parts = self.get_controller(req.path)
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p = req.path_info
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if isinstance(p, unicode):
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p = p.encode('utf-8')
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except ValueError:
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self.logger.increment('errors')
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return HTTPNotFound(request=req)
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if not controller:
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self.logger.increment('errors')
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return HTTPPreconditionFailed(request=req, body='Bad URL')
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if self.deny_host_headers and \
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req.host.split(':')[0] in self.deny_host_headers:
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return HTTPForbidden(request=req, body='Invalid host header')
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self.logger.set_statsd_prefix('proxy-server.' +
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controller.server_type.lower())
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controller = controller(self, **path_parts)
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if 'swift.trans_id' not in req.environ:
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# if this wasn't set by an earlier middleware, set it now
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trans_id = generate_trans_id(self.trans_id_suffix)
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req.environ['swift.trans_id'] = trans_id
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self.logger.txn_id = trans_id
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req.headers['x-trans-id'] = req.environ['swift.trans_id']
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controller.trans_id = req.environ['swift.trans_id']
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self.logger.client_ip = get_remote_client(req)
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try:
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handler = getattr(controller, req.method)
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getattr(handler, 'publicly_accessible')
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except AttributeError:
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allowed_methods = getattr(controller, 'allowed_methods', set())
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return HTTPMethodNotAllowed(
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request=req, headers={'Allow': ', '.join(allowed_methods)})
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if 'swift.authorize' in req.environ:
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# We call authorize before the handler, always. If authorized,
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# we remove the swift.authorize hook so isn't ever called
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# again. If not authorized, we return the denial unless the
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# controller's method indicates it'd like to gather more
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# information and try again later.
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resp = req.environ['swift.authorize'](req)
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if not resp:
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# No resp means authorized, no delayed recheck required.
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del req.environ['swift.authorize']
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else:
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# Response indicates denial, but we might delay the denial
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# and recheck later. If not delayed, return the error now.
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if not getattr(handler, 'delay_denial', None):
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return resp
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# Save off original request method (GET, POST, etc.) in case it
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# gets mutated during handling. This way logging can display the
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# method the client actually sent.
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req.environ['swift.orig_req_method'] = req.method
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return handler(req)
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except HTTPException as error_response:
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return error_response
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except (Exception, Timeout):
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self.logger.exception(_('ERROR Unhandled exception in request'))
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return HTTPServerError(request=req)
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def sort_nodes(self, nodes):
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'''
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Sorts nodes in-place (and returns the sorted list) according to
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the configured strategy. The default "sorting" is to randomly
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shuffle the nodes. If the "timing" strategy is chosen, the nodes
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are sorted according to the stored timing data.
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'''
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# In the case of timing sorting, shuffling ensures that close timings
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# (ie within the rounding resolution) won't prefer one over another.
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# Python's sort is stable (http://wiki.python.org/moin/HowTo/Sorting/)
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shuffle(nodes)
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if self.sorting_method == 'timing':
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now = time()
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def key_func(node):
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timing, expires = self.node_timings.get(node['ip'], (-1.0, 0))
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return timing if expires > now else -1.0
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nodes.sort(key=key_func)
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elif self.sorting_method == 'affinity':
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nodes.sort(key=self.read_affinity_sort_key)
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return nodes
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def set_node_timing(self, node, timing):
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if self.sorting_method != 'timing':
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return
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now = time()
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timing = round(timing, 3) # sort timings to the millisecond
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self.node_timings[node['ip']] = (timing, now + self.timing_expiry)
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def error_limited(self, node):
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"""
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Check if the node is currently error limited.
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:param node: dictionary of node to check
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:returns: True if error limited, False otherwise
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"""
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now = time()
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if 'errors' not in node:
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return False
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if 'last_error' in node and node['last_error'] < \
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now - self.error_suppression_interval:
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del node['last_error']
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if 'errors' in node:
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del node['errors']
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return False
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limited = node['errors'] > self.error_suppression_limit
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if limited:
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self.logger.debug(
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_('Node error limited %(ip)s:%(port)s (%(device)s)'), node)
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return limited
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def error_limit(self, node, msg):
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"""
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Mark a node as error limited. This immediately pretends the
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node received enough errors to trigger error suppression. Use
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this for errors like Insufficient Storage. For other errors
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use :func:`error_occurred`.
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:param node: dictionary of node to error limit
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:param msg: error message
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"""
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node['errors'] = self.error_suppression_limit + 1
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node['last_error'] = time()
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self.logger.error(_('%(msg)s %(ip)s:%(port)s/%(device)s'),
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{'msg': msg, 'ip': node['ip'],
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'port': node['port'], 'device': node['device']})
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def error_occurred(self, node, msg):
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"""
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Handle logging, and handling of errors.
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:param node: dictionary of node to handle errors for
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:param msg: error message
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"""
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node['errors'] = node.get('errors', 0) + 1
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node['last_error'] = time()
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self.logger.error(_('%(msg)s %(ip)s:%(port)s/%(device)s'),
|
|
{'msg': msg, 'ip': node['ip'],
|
|
'port': node['port'], 'device': node['device']})
|
|
|
|
def iter_nodes(self, ring, partition, node_iter=None):
|
|
"""
|
|
Yields nodes for a ring partition, skipping over error
|
|
limited nodes and stopping at the configurable number of
|
|
nodes. If a node yielded subsequently gets error limited, an
|
|
extra node will be yielded to take its place.
|
|
|
|
Note that if you're going to iterate over this concurrently from
|
|
multiple greenthreads, you'll want to use a
|
|
swift.common.utils.GreenthreadSafeIterator to serialize access.
|
|
Otherwise, you may get ValueErrors from concurrent access. (You also
|
|
may not, depending on how logging is configured, the vagaries of
|
|
socket IO and eventlet, and the phase of the moon.)
|
|
|
|
:param ring: ring to get yield nodes from
|
|
:param partition: ring partition to yield nodes for
|
|
:param node_iter: optional iterable of nodes to try. Useful if you
|
|
want to filter or reorder the nodes.
|
|
"""
|
|
part_nodes = ring.get_part_nodes(partition)
|
|
if node_iter is None:
|
|
node_iter = itertools.chain(part_nodes,
|
|
ring.get_more_nodes(partition))
|
|
num_primary_nodes = len(part_nodes)
|
|
|
|
# Use of list() here forcibly yanks the first N nodes (the primary
|
|
# nodes) from node_iter, so the rest of its values are handoffs.
|
|
primary_nodes = self.sort_nodes(
|
|
list(itertools.islice(node_iter, num_primary_nodes)))
|
|
handoff_nodes = node_iter
|
|
nodes_left = self.request_node_count(len(primary_nodes))
|
|
|
|
for node in primary_nodes:
|
|
if not self.error_limited(node):
|
|
yield node
|
|
if not self.error_limited(node):
|
|
nodes_left -= 1
|
|
if nodes_left <= 0:
|
|
return
|
|
handoffs = 0
|
|
for node in handoff_nodes:
|
|
if not self.error_limited(node):
|
|
handoffs += 1
|
|
if self.log_handoffs:
|
|
self.logger.increment('handoff_count')
|
|
self.logger.warning(
|
|
'Handoff requested (%d)' % handoffs)
|
|
if handoffs == len(primary_nodes):
|
|
self.logger.increment('handoff_all_count')
|
|
yield node
|
|
if not self.error_limited(node):
|
|
nodes_left -= 1
|
|
if nodes_left <= 0:
|
|
return
|
|
|
|
def exception_occurred(self, node, typ, additional_info):
|
|
"""
|
|
Handle logging of generic exceptions.
|
|
|
|
:param node: dictionary of node to log the error for
|
|
:param typ: server type
|
|
:param additional_info: additional information to log
|
|
"""
|
|
self.logger.exception(
|
|
_('ERROR with %(type)s server %(ip)s:%(port)s/%(device)s re: '
|
|
'%(info)s'),
|
|
{'type': typ, 'ip': node['ip'], 'port': node['port'],
|
|
'device': node['device'], 'info': additional_info})
|
|
|
|
def modify_wsgi_pipeline(self, pipe):
|
|
"""
|
|
Called during WSGI pipeline creation. Modifies the WSGI pipeline
|
|
context to ensure that mandatory middleware is present in the pipeline.
|
|
|
|
:param pipe: A PipelineWrapper object
|
|
"""
|
|
pipeline_was_modified = False
|
|
for filter_spec in reversed(required_filters):
|
|
filter_name = filter_spec['name']
|
|
if filter_name not in pipe:
|
|
afters = filter_spec.get('after_fn', lambda _junk: [])(pipe)
|
|
insert_at = 0
|
|
for after in afters:
|
|
try:
|
|
insert_at = max(insert_at, pipe.index(after) + 1)
|
|
except ValueError: # not in pipeline; ignore it
|
|
pass
|
|
self.logger.info(
|
|
'Adding required filter %s to pipeline at position %d' %
|
|
(filter_name, insert_at))
|
|
ctx = pipe.create_filter(filter_name)
|
|
pipe.insert_filter(ctx, index=insert_at)
|
|
pipeline_was_modified = True
|
|
|
|
if pipeline_was_modified:
|
|
self.logger.info("Pipeline was modified. New pipeline is \"%s\".",
|
|
pipe)
|
|
else:
|
|
self.logger.debug("Pipeline is \"%s\"", pipe)
|
|
|
|
|
|
def app_factory(global_conf, **local_conf):
|
|
"""paste.deploy app factory for creating WSGI proxy apps."""
|
|
conf = global_conf.copy()
|
|
conf.update(local_conf)
|
|
app = Application(conf)
|
|
app.check_config()
|
|
return app
|