552 lines
17 KiB
Python
552 lines
17 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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System-level utilities and helper functions.
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"""
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import errno
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try:
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from eventlet import sleep
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except ImportError:
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from time import sleep
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from eventlet.green import socket
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import functools
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import os
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import platform
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import subprocess
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import sys
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import uuid
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from OpenSSL import crypto
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from oslo.config import cfg
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from webob import exc
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from glance.common import exception
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import glance.openstack.common.log as logging
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from glance.openstack.common import strutils
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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FEATURE_BLACKLIST = ['content-length', 'content-type', 'x-image-meta-size']
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# Whitelist of v1 API headers of form x-image-meta-xxx
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IMAGE_META_HEADERS = ['x-image-meta-location', 'x-image-meta-size',
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'x-image-meta-is_public', 'x-image-meta-disk_format',
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'x-image-meta-container_format', 'x-image-meta-name',
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'x-image-meta-status', 'x-image-meta-copy_from',
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'x-image-meta-uri', 'x-image-meta-checksum',
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'x-image-meta-created_at', 'x-image-meta-updated_at',
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'x-image-meta-deleted_at', 'x-image-meta-min_ram',
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'x-image-meta-min_disk', 'x-image-meta-owner',
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'x-image-meta-store', 'x-image-meta-id',
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'x-image-meta-protected', 'x-image-meta-deleted']
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GLANCE_TEST_SOCKET_FD_STR = 'GLANCE_TEST_SOCKET_FD'
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def chunkreadable(iter, chunk_size=65536):
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"""
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Wrap a readable iterator with a reader yielding chunks of
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a preferred size, otherwise leave iterator unchanged.
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:param iter: an iter which may also be readable
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:param chunk_size: maximum size of chunk
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"""
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return chunkiter(iter, chunk_size) if hasattr(iter, 'read') else iter
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def chunkiter(fp, chunk_size=65536):
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"""
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Return an iterator to a file-like obj which yields fixed size chunks
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:param fp: a file-like object
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:param chunk_size: maximum size of chunk
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"""
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while True:
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chunk = fp.read(chunk_size)
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if chunk:
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yield chunk
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else:
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break
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def cooperative_iter(iter):
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"""
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Return an iterator which schedules after each
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iteration. This can prevent eventlet thread starvation.
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:param iter: an iterator to wrap
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"""
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try:
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for chunk in iter:
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sleep(0)
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yield chunk
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except Exception as err:
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msg = _("Error: cooperative_iter exception %s") % err
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LOG.error(msg)
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raise
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def cooperative_read(fd):
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"""
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Wrap a file descriptor's read with a partial function which schedules
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after each read. This can prevent eventlet thread starvation.
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:param fd: a file descriptor to wrap
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"""
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def readfn(*args):
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result = fd.read(*args)
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sleep(0)
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return result
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return readfn
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class CooperativeReader(object):
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"""
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An eventlet thread friendly class for reading in image data.
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When accessing data either through the iterator or the read method
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we perform a sleep to allow a co-operative yield. When there is more than
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one image being uploaded/downloaded this prevents eventlet thread
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starvation, ie allows all threads to be scheduled periodically rather than
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having the same thread be continuously active.
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"""
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def __init__(self, fd):
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"""
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:param fd: Underlying image file object
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"""
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self.fd = fd
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self.iterator = None
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# NOTE(markwash): if the underlying supports read(), overwrite the
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# default iterator-based implementation with cooperative_read which
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# is more straightforward
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if hasattr(fd, 'read'):
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self.read = cooperative_read(fd)
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def read(self, length=None):
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"""Return the next chunk of the underlying iterator.
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This is replaced with cooperative_read in __init__ if the underlying
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fd already supports read().
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"""
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if self.iterator is None:
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self.iterator = self.__iter__()
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try:
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return self.iterator.next()
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except StopIteration:
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return ''
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def __iter__(self):
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return cooperative_iter(self.fd.__iter__())
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class LimitingReader(object):
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"""
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Reader designed to fail when reading image data past the configured
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allowable amount.
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"""
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def __init__(self, data, limit):
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"""
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:param data: Underlying image data object
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:param limit: maximum number of bytes the reader should allow
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"""
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self.data = data
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self.limit = limit
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self.bytes_read = 0
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def __iter__(self):
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for chunk in self.data:
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self.bytes_read += len(chunk)
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if self.bytes_read > self.limit:
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raise exception.ImageSizeLimitExceeded()
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else:
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yield chunk
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def read(self, i):
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result = self.data.read(i)
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self.bytes_read += len(result)
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if self.bytes_read > self.limit:
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raise exception.ImageSizeLimitExceeded()
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return result
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def image_meta_to_http_headers(image_meta):
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"""
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Returns a set of image metadata into a dict
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of HTTP headers that can be fed to either a Webob
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Request object or an httplib.HTTP(S)Connection object
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:param image_meta: Mapping of image metadata
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"""
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headers = {}
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for k, v in image_meta.items():
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if v is not None:
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if k == 'properties':
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for pk, pv in v.items():
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if pv is not None:
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headers["x-image-meta-property-%s"
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% pk.lower()] = unicode(pv)
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else:
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headers["x-image-meta-%s" % k.lower()] = unicode(v)
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return headers
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def add_features_to_http_headers(features, headers):
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"""
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Adds additional headers representing glance features to be enabled.
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:param headers: Base set of headers
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:param features: Map of enabled features
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"""
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if features:
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for k, v in features.items():
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if k.lower() in FEATURE_BLACKLIST:
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raise exception.UnsupportedHeaderFeature(feature=k)
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if v is not None:
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headers[k.lower()] = unicode(v)
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def get_image_meta_from_headers(response):
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"""
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Processes HTTP headers from a supplied response that
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match the x-image-meta and x-image-meta-property and
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returns a mapping of image metadata and properties
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:param response: Response to process
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"""
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result = {}
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properties = {}
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if hasattr(response, 'getheaders'): # httplib.HTTPResponse
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headers = response.getheaders()
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else: # webob.Response
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headers = response.headers.items()
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for key, value in headers:
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key = str(key.lower())
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if key.startswith('x-image-meta-property-'):
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field_name = key[len('x-image-meta-property-'):].replace('-', '_')
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properties[field_name] = value or None
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elif key.startswith('x-image-meta-'):
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field_name = key[len('x-image-meta-'):].replace('-', '_')
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if 'x-image-meta-' + field_name not in IMAGE_META_HEADERS:
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msg = _("Bad header: %(header_name)s") % {'header_name': key}
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raise exc.HTTPBadRequest(msg, content_type="text/plain")
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result[field_name] = value or None
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result['properties'] = properties
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for key in ('size', 'min_disk', 'min_ram'):
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if key in result:
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try:
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result[key] = int(result[key])
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except ValueError:
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extra = (_("Cannot convert image %(key)s '%(value)s' "
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"to an integer.")
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% {'key': key, 'value': result[key]})
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raise exception.InvalidParameterValue(value=result[key],
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param=key,
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extra_msg=extra)
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if result[key] < 0:
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extra = (_("Image %(key)s must be >= 0 "
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"('%(value)s' specified).")
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% {'key': key, 'value': result[key]})
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raise exception.InvalidParameterValue(value=result[key],
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param=key,
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extra_msg=extra)
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for key in ('is_public', 'deleted', 'protected'):
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if key in result:
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result[key] = strutils.bool_from_string(result[key])
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return result
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def safe_mkdirs(path):
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try:
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os.makedirs(path)
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except OSError as e:
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if e.errno != errno.EEXIST:
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raise
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def safe_remove(path):
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try:
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os.remove(path)
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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class PrettyTable(object):
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"""Creates an ASCII art table for use in bin/glance
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Example:
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ID Name Size Hits
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--- ----------------- ------------ -----
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122 image 22 0
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"""
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def __init__(self):
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self.columns = []
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def add_column(self, width, label="", just='l'):
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"""Add a column to the table
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:param width: number of characters wide the column should be
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:param label: column heading
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:param just: justification for the column, 'l' for left,
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'r' for right
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"""
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self.columns.append((width, label, just))
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def make_header(self):
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label_parts = []
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break_parts = []
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for width, label, _ in self.columns:
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# NOTE(sirp): headers are always left justified
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label_part = self._clip_and_justify(label, width, 'l')
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label_parts.append(label_part)
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break_part = '-' * width
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break_parts.append(break_part)
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label_line = ' '.join(label_parts)
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break_line = ' '.join(break_parts)
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return '\n'.join([label_line, break_line])
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def make_row(self, *args):
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row = args
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row_parts = []
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for data, (width, _, just) in zip(row, self.columns):
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row_part = self._clip_and_justify(data, width, just)
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row_parts.append(row_part)
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row_line = ' '.join(row_parts)
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return row_line
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@staticmethod
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def _clip_and_justify(data, width, just):
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# clip field to column width
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clipped_data = str(data)[:width]
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if just == 'r':
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# right justify
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justified = clipped_data.rjust(width)
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else:
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# left justify
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justified = clipped_data.ljust(width)
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return justified
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def get_terminal_size():
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def _get_terminal_size_posix():
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import fcntl
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import struct
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import termios
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height_width = None
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try:
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height_width = struct.unpack('hh', fcntl.ioctl(sys.stderr.fileno(),
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termios.TIOCGWINSZ,
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struct.pack('HH', 0, 0)))
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except Exception:
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pass
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if not height_width:
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try:
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p = subprocess.Popen(['stty', 'size'],
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shell=False,
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stdout=subprocess.PIPE,
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stderr=open(os.devnull, 'w'))
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result = p.communicate()
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if p.returncode == 0:
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return tuple(int(x) for x in result[0].split())
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except Exception:
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pass
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return height_width
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def _get_terminal_size_win32():
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try:
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from ctypes import windll, create_string_buffer
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handle = windll.kernel32.GetStdHandle(-12)
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csbi = create_string_buffer(22)
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res = windll.kernel32.GetConsoleScreenBufferInfo(handle, csbi)
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except Exception:
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return None
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if res:
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import struct
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unpack_tmp = struct.unpack("hhhhHhhhhhh", csbi.raw)
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(bufx, bufy, curx, cury, wattr,
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left, top, right, bottom, maxx, maxy) = unpack_tmp
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height = bottom - top + 1
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width = right - left + 1
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return (height, width)
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else:
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return None
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def _get_terminal_size_unknownOS():
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raise NotImplementedError
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func = {'posix': _get_terminal_size_posix,
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'win32': _get_terminal_size_win32}
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height_width = func.get(platform.os.name, _get_terminal_size_unknownOS)()
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if height_width is None:
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raise exception.Invalid()
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for i in height_width:
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if not isinstance(i, int) or i <= 0:
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raise exception.Invalid()
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return height_width[0], height_width[1]
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def mutating(func):
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"""Decorator to enforce read-only logic"""
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@functools.wraps(func)
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def wrapped(self, req, *args, **kwargs):
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if req.context.read_only:
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msg = _("Read-only access")
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LOG.debug(msg)
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raise exc.HTTPForbidden(msg, request=req,
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content_type="text/plain")
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return func(self, req, *args, **kwargs)
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return wrapped
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def setup_remote_pydev_debug(host, port):
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error_msg = ('Error setting up the debug environment. Verify that the'
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' option pydev_worker_debug_port is pointing to a valid '
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'hostname or IP on which a pydev server is listening on'
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' the port indicated by pydev_worker_debug_port.')
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try:
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try:
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from pydev import pydevd
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except ImportError:
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import pydevd
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pydevd.settrace(host,
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port=port,
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stdoutToServer=True,
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stderrToServer=True)
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return True
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except Exception:
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LOG.exception(error_msg)
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raise
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class LazyPluggable(object):
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"""A pluggable backend loaded lazily based on some value."""
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def __init__(self, pivot, config_group=None, **backends):
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self.__backends = backends
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self.__pivot = pivot
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self.__backend = None
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self.__config_group = config_group
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def __get_backend(self):
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if not self.__backend:
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if self.__config_group is None:
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backend_name = CONF[self.__pivot]
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else:
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backend_name = CONF[self.__config_group][self.__pivot]
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if backend_name not in self.__backends:
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msg = _('Invalid backend: %s') % backend_name
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raise exception.GlanceException(msg)
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backend = self.__backends[backend_name]
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if isinstance(backend, tuple):
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name = backend[0]
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fromlist = backend[1]
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else:
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name = backend
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fromlist = backend
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self.__backend = __import__(name, None, None, fromlist)
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return self.__backend
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def __getattr__(self, key):
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backend = self.__get_backend()
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return getattr(backend, key)
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def validate_key_cert(key_file, cert_file):
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try:
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error_key_name = "private key"
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error_filename = key_file
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key_str = open(key_file, "r").read()
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key = crypto.load_privatekey(crypto.FILETYPE_PEM, key_str)
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error_key_name = "certficate"
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error_filename = cert_file
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cert_str = open(cert_file, "r").read()
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cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_str)
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except IOError as ioe:
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raise RuntimeError(_("There is a problem with your %s "
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"%s. Please verify it. Error: %s")
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% (error_key_name, error_filename, ioe))
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except crypto.Error as ce:
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raise RuntimeError(_("There is a problem with your %s "
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"%s. Please verify it. OpenSSL error: %s")
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% (error_key_name, error_filename, ce))
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try:
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data = str(uuid.uuid4())
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digest = "sha1"
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out = crypto.sign(key, data, digest)
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crypto.verify(cert, out, data, digest)
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except crypto.Error as ce:
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raise RuntimeError(_("There is a problem with your key pair. "
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"Please verify that cert %s and key %s "
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"belong together. OpenSSL error %s")
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% (cert_file, key_file, ce))
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def get_test_suite_socket():
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global GLANCE_TEST_SOCKET_FD_STR
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if GLANCE_TEST_SOCKET_FD_STR in os.environ:
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fd = int(os.environ[GLANCE_TEST_SOCKET_FD_STR])
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sock = socket.fromfd(fd, socket.AF_INET, socket.SOCK_STREAM)
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sock = socket.SocketType(_sock=sock)
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sock.listen(CONF.backlog)
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del os.environ[GLANCE_TEST_SOCKET_FD_STR]
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os.close(fd)
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return sock
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return None
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def is_uuid_like(val):
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"""Returns validation of a value as a UUID.
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For our purposes, a UUID is a canonical form string:
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aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa
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"""
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try:
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return str(uuid.UUID(val)) == val
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except (TypeError, ValueError, AttributeError):
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return False
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