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# -*- coding: utf-8 -*-
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2018 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
#
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
PROC_LVE = '/proc/lve'
LIMIT_LVP_ID = 4294967295
class ProcLveError(Exception):
pass
class NoSuchLvp(ProcLveError):
pass
class ProcLve:
def __init__(self, proc_lve=PROC_LVE):
self._lvp = 'lvp'
self.list = 'list'
self.proc_lve = proc_lve
self._version = None
def proc_lve_list(self):
"""
Return path to /proc/lve/list
"""
return os.path.join(self.proc_lve, self.list)
def version(self):
"""
Return /proc/lve filesystem version
"""
if self._version is not None:
return self._version
with open(self.proc_lve_list()) as f:
line = f.read(3) # we need only first three symbols for parse version
self._version = int(line.rsplit(':', 1)[0])
return self._version
def proc_lve_map(self):
return os.path.join(self.proc_lve, 'map')
def proc_lve_resellers(self):
"""
Return path to /proc/lve/resellers
"""
return os.path.join(self.proc_lve, 'resellers')
def resellers_supported(self):
"""
Check present /proc/lve/resellers
"""
return os.path.exists(self.proc_lve_resellers())
def get_list_path(self, lvp_id=0):
"""
Generate path to list file
"""
if lvp_id == 0:
return self.proc_lve_list()
else:
return os.path.join(self.proc_lve_resellers(), self._lvp + str(lvp_id), self.list)
def _extract_id(self, line):
return int(line.split()[0].split(',')[-1])
def _lines(self, lvp_id=0):
path = self.get_list_path(lvp_id=lvp_id)
try:
with open(path) as list_:
lines = list_.read().strip()
except IOError as e:
if e.errno == 2: # 2 code error - No such file or directory
raise NoSuchLvp('No such lvp id {}'.format(lvp_id))
else:
raise
lines = lines.split('\n')[1:]
for line in lines:
yield self._extract_id(line), line.rstrip(os.linesep)
def lines(self, lvp_id=0, without_limits=True):
for lve_id, line in self._lines(lvp_id=lvp_id):
if lve_id == LIMIT_LVP_ID and without_limits:
continue
yield line
def lve_id_list(self, lvp_id=0):
for lve_id, _ in self._lines(lvp_id=lvp_id):
if lve_id in (LIMIT_LVP_ID, 0):
continue
yield lve_id
def lvp_id_list(self):
"""
Obtain from /proc/lve/resellers lvp id list
"""
for lvp_dir in os.listdir(self.proc_lve_resellers()):
if lvp_dir.startswith(self._lvp):
yield int(lvp_dir[len(self._lvp):])
def check_inside_list(self, id_, lvp_id=0):
for lve_id in self.lve_id_list(lvp_id=lvp_id):
if lve_id == id_:
return True
def exist_lvp(self, lvp_id):
"""
Check present lve top container
"""
return os.path.exists(self.get_list_path(lvp_id))
def detect_inside_lvp(self, id_):
"""
Find in which lve top container
"""
for lvp_id in self.lvp_id_list():
if self.exist_lvp(lvp_id) and self.check_inside_list(id_, lvp_id):
return lvp_id
def map(self):
"""
Obtain map from /proc/lve/map as dict
"""
map_dict = dict()
with open(self.proc_lve_map()) as map_:
lines = map_.read().strip()
lines = lines.split('\n')[1:]
for line in lines:
lve_id_str, lvp_id_str = line.strip().split()
map_dict[int(lve_id_str)] = int(lvp_id_str)
return map_dict
def map_lve_id_list(self, lvp_id):
return [lve_id_ for lve_id_, lvp_id_ in list(self.map().items()) if lvp_id_ == lvp_id]
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