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# Copyright 2015 Tesora Inc.
# All Rights Reserved.
#
# 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.
from collections import abc
import os
import re
from trove.common import cfg
from trove.common import pagination
from trove.common import utils
from trove.guestagent.common import operating_system
CONF = cfg.CONF
def update_dict(updates, target):
"""Recursively update a target dictionary with given updates.
Updates are provided as a dictionary of key-value pairs
where a value can also be a nested dictionary in which case
its key is treated as a sub-section of the outer key.
If a list value is encountered the update is applied
iteratively on all its items.
:returns: Will always return a dictionary of results (may be empty).
"""
if target is None:
target = {}
if isinstance(target, list):
for index, item in enumerate(target):
target[index] = update_dict(updates, item)
return target
if updates is not None:
for k, v in updates.items():
if isinstance(v, abc.Mapping):
target[k] = update_dict(v, target.get(k, {}))
else:
target[k] = updates[k]
return target
def expand_dict(target, namespace_sep='.'):
"""Expand a flat dict to a nested one.
This is an inverse of 'flatten_dict'.
:seealso: flatten_dict
"""
nested = {}
for k, v in target.items():
sub = nested
keys = k.split(namespace_sep)
for key in keys[:-1]:
sub = sub.setdefault(key, {})
sub[keys[-1]] = v
return nested
def flatten_dict(target, namespace_sep='.'):
"""Flatten a nested dict.
Return a one-level dict with all sub-level keys joined by a namespace
separator.
The following nested dict:
{'ns1': {'ns2a': {'ns3a': True, 'ns3b': False}, 'ns2b': 10}}
would be flattened to:
{'ns1.ns2a.ns3a': True, 'ns1.ns2a.ns3b': False, 'ns1.ns2b': 10}
"""
def flatten(target, keys, namespace_sep):
flattened = {}
if isinstance(target, abc.Mapping):
for k, v in target.items():
flattened.update(
flatten(v, keys + [k], namespace_sep))
else:
ns = namespace_sep.join(keys)
flattened[ns] = target
return flattened
return flatten(target, [], namespace_sep)
def build_file_path(base_dir, base_name, *extensions):
"""Build a path to a file in a given directory.
The file may have an extension(s).
:returns: Path such as: 'base_dir/base_name.ext1.ext2.ext3'
"""
file_name = os.extsep.join([base_name] + list(extensions))
return os.path.expanduser(os.path.join(base_dir, file_name))
def to_bytes(value):
"""Convert numbers with a byte suffix to bytes.
"""
if isinstance(value, str):
pattern = re.compile(r'^(\d+)([K,M,G]{1})$')
match = pattern.match(value)
if match:
value = match.group(1)
suffix = match.group(2)
factor = {
'K': 1024,
'M': 1024 ** 2,
'G': 1024 ** 3,
}[suffix]
return int(round(factor * float(value)))
return value
def paginate_list(li, limit=None, marker=None, include_marker=False):
"""Paginate a list of objects based on the name attribute.
:returns: Page sublist and a marker (name of the last item).
"""
return pagination.paginate_object_list(
li, 'name', limit=limit, marker=marker, include_marker=include_marker)
def serialize_list(li, limit=None, marker=None, include_marker=False):
"""
Paginate (by name) and serialize a given object list.
:returns: A serialized and paginated version of a given list.
"""
page, next_name = paginate_list(li, limit=limit, marker=marker,
include_marker=include_marker)
return [item.serialize() for item in page], next_name
def get_filesystem_volume_stats(fs_path):
try:
stats = os.statvfs(fs_path)
except OSError:
raise RuntimeError("Filesystem not found (%s)" % fs_path)
total = stats.f_blocks * stats.f_bsize
free = stats.f_bfree * stats.f_bsize
# return the size in GB
used_gb = utils.to_gb(total - free)
total_gb = utils.to_gb(total)
output = {
'block_size': stats.f_bsize,
'total_blocks': stats.f_blocks,
'free_blocks': stats.f_bfree,
'total': total_gb,
'free': free,
'used': used_gb
}
return output
def get_conf_dir():
"""Get the config directory for the database related settings.
For now, the files inside the config dir are mainly for instance rebuild.
"""
mount_point = CONF.get(CONF.datastore_manager).mount_point
conf_dir = os.path.join(mount_point, 'conf.d')
if not operating_system.exists(conf_dir, is_directory=True, as_root=True):
operating_system.ensure_directory(conf_dir, as_root=True)
return conf_dir
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