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# -*- coding: utf-8 -*-
from __future__ import absolute_import
import datetime
import logging
import os
from contextlib import contextmanager
import cephfs
from .. import mgr
logger = logging.getLogger('cephfs')
class CephFS(object):
@classmethod
def list_filesystems(cls):
fsmap = mgr.get("fs_map")
return [{'id': fs['id'], 'name': fs['mdsmap']['fs_name']}
for fs in fsmap['filesystems']]
@classmethod
def fs_name_from_id(cls, fs_id):
"""
Get the filesystem name from ID.
:param fs_id: The filesystem ID.
:type fs_id: int | str
:return: The filesystem name or None.
:rtype: str | None
"""
fs_map = mgr.get("fs_map")
fs_info = list(filter(lambda x: str(x['id']) == str(fs_id),
fs_map['filesystems']))
if not fs_info:
return None
return fs_info[0]['mdsmap']['fs_name']
def __init__(self, fs_name=None):
logger.debug("initializing cephfs connection")
self.cfs = cephfs.LibCephFS(rados_inst=mgr.rados)
logger.debug("mounting cephfs filesystem: %s", fs_name)
if fs_name:
self.cfs.mount(filesystem_name=fs_name)
else:
self.cfs.mount()
logger.debug("mounted cephfs filesystem")
def __del__(self):
logger.debug("shutting down cephfs filesystem")
self.cfs.shutdown()
@contextmanager
def opendir(self, dirpath):
d = None
try:
d = self.cfs.opendir(dirpath)
yield d
finally:
if d:
self.cfs.closedir(d)
def ls_dir(self, path, depth):
"""
List directories of specified path with additional information.
:param path: The root directory path.
:type path: str | bytes
:param depth: The number of steps to go down the directory tree.
:type depth: int | str
:return: A list of directory dicts which consist of name, path,
parent, snapshots and quotas.
:rtype: list
"""
paths = self._ls_dir(path, int(depth))
# Convert (bytes => string), prettify paths (strip slashes)
# and append additional information.
return [self.get_directory(p) for p in paths if p != path.encode()]
def _ls_dir(self, path, depth):
"""
List directories of specified path.
:param path: The root directory path.
:type path: str | bytes
:param depth: The number of steps to go down the directory tree.
:type depth: int
:return: A list of directory paths (bytes encoded).
Example:
ls_dir('/photos', 1) => [
b'/photos/flowers', b'/photos/cars'
]
:rtype: list
"""
if isinstance(path, str):
path = path.encode()
logger.debug("get_dir_list dirpath=%s depth=%s", path,
depth)
if depth == 0:
return [path]
logger.debug("opening dirpath=%s", path)
with self.opendir(path) as d:
dent = self.cfs.readdir(d)
paths = [path]
while dent:
logger.debug("found entry=%s", dent.d_name)
if dent.d_name in [b'.', b'..']:
dent = self.cfs.readdir(d)
continue
if dent.is_dir():
logger.debug("found dir=%s", dent.d_name)
subdir_path = os.path.join(path, dent.d_name)
paths.extend(self._ls_dir(subdir_path, depth - 1))
dent = self.cfs.readdir(d)
return paths
def get_directory(self, path):
"""
Transforms path of directory into a meaningful dictionary.
:param path: The root directory path.
:type path: str | bytes
:return: Dict consists of name, path, parent, snapshots and quotas.
:rtype: dict
"""
path = path.decode()
not_root = path != os.sep
return {
'name': os.path.basename(path) if not_root else path,
'path': path,
'parent': os.path.dirname(path) if not_root else None,
'snapshots': self.ls_snapshots(path),
'quotas': self.get_quotas(path) if not_root else None
}
def dir_exists(self, path):
try:
with self.opendir(path):
return True
except cephfs.ObjectNotFound:
return False
def mk_dirs(self, path):
"""
Create a directory.
:param path: The path of the directory.
"""
if path == os.sep:
raise Exception('Cannot create root directory "/"')
if self.dir_exists(path):
return
logger.info("Creating directory: %s", path)
self.cfs.mkdirs(path, 0o755)
def rm_dir(self, path):
"""
Remove a directory.
:param path: The path of the directory.
"""
if path == os.sep:
raise Exception('Cannot remove root directory "/"')
if not self.dir_exists(path):
return
logger.info("Removing directory: %s", path)
self.cfs.rmdir(path)
def mk_snapshot(self, path, name=None, mode=0o755):
"""
Create a snapshot.
:param path: The path of the directory.
:type path: str
:param name: The name of the snapshot. If not specified,
a name using the current time in RFC3339 UTC format
will be generated.
:type name: str | None
:param mode: The permissions the directory should have
once created.
:type mode: int
:return: Returns the name of the snapshot.
:rtype: str
"""
if name is None:
now = datetime.datetime.now()
tz = now.astimezone().tzinfo
name = now.replace(tzinfo=tz).isoformat('T')
client_snapdir = self.cfs.conf_get('client_snapdir')
snapshot_path = os.path.join(path, client_snapdir, name)
logger.info("Creating snapshot: %s", snapshot_path)
self.cfs.mkdir(snapshot_path, mode)
return name
def ls_snapshots(self, path):
"""
List snapshots for the specified path.
:param path: The path of the directory.
:type path: str
:return: A list of dictionaries containing the name and the
creation time of the snapshot.
:rtype: list
"""
result = []
client_snapdir = self.cfs.conf_get('client_snapdir')
path = os.path.join(path, client_snapdir).encode()
with self.opendir(path) as d:
dent = self.cfs.readdir(d)
while dent:
if dent.is_dir():
if dent.d_name not in [b'.', b'..'] and not dent.d_name.startswith(b'_'):
snapshot_path = os.path.join(path, dent.d_name)
stat = self.cfs.stat(snapshot_path)
result.append({
'name': dent.d_name.decode(),
'path': snapshot_path.decode(),
'created': '{}Z'.format(stat.st_ctime.isoformat('T'))
})
dent = self.cfs.readdir(d)
return result
def rm_snapshot(self, path, name):
"""
Remove a snapshot.
:param path: The path of the directory.
:type path: str
:param name: The name of the snapshot.
:type name: str
"""
client_snapdir = self.cfs.conf_get('client_snapdir')
snapshot_path = os.path.join(path, client_snapdir, name)
logger.info("Removing snapshot: %s", snapshot_path)
self.cfs.rmdir(snapshot_path)
def get_quotas(self, path):
"""
Get the quotas of the specified path.
:param path: The path of the directory/file.
:type path: str
:return: Returns a dictionary containing 'max_bytes'
and 'max_files'.
:rtype: dict
"""
try:
max_bytes = int(self.cfs.getxattr(path, 'ceph.quota.max_bytes'))
except cephfs.NoData:
max_bytes = 0
try:
max_files = int(self.cfs.getxattr(path, 'ceph.quota.max_files'))
except cephfs.NoData:
max_files = 0
return {'max_bytes': max_bytes, 'max_files': max_files}
def set_quotas(self, path, max_bytes=None, max_files=None):
"""
Set the quotas of the specified path.
:param path: The path of the directory/file.
:type path: str
:param max_bytes: The byte limit.
:type max_bytes: int | None
:param max_files: The file limit.
:type max_files: int | None
"""
if max_bytes is not None:
self.cfs.setxattr(path, 'ceph.quota.max_bytes',
str(max_bytes).encode(), 0)
if max_files is not None:
self.cfs.setxattr(path, 'ceph.quota.max_files',
str(max_files).encode(), 0)
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