228 lines
6.6 KiB
Python
228 lines
6.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Nicira Networks, Inc
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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 datetime
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import inspect
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import logging
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import os
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import random
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import subprocess
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import socket
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import sys
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import ConfigParser
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import exceptions as exception
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import flags
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from exceptions import ProcessExecutionError
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TIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
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FLAGS = flags.FLAGS
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def int_from_bool_as_string(subject):
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"""
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Interpret a string as a boolean and return either 1 or 0.
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Any string value in:
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('True', 'true', 'On', 'on', '1')
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is interpreted as a boolean True.
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Useful for JSON-decoded stuff and config file parsing
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"""
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return bool_from_string(subject) and 1 or 0
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def bool_from_string(subject):
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"""
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Interpret a string as a boolean.
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Any string value in:
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('True', 'true', 'On', 'on', '1')
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is interpreted as a boolean True.
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Useful for JSON-decoded stuff and config file parsing
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"""
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if type(subject) == type(bool):
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return subject
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if hasattr(subject, 'startswith'): # str or unicode...
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if subject.strip().lower() in ('true', 'on', '1'):
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return True
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return False
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def import_class(import_str):
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"""Returns a class from a string including module and class"""
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mod_str, _sep, class_str = import_str.rpartition('.')
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try:
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#mod_str = os.path.join(FLAGS.state_path, mod_str)
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__import__(mod_str)
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return getattr(sys.modules[mod_str], class_str)
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except (ImportError, ValueError, AttributeError) as e:
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print e
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raise exception.NotFound('Class %s cannot be found' % class_str)
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def import_object(import_str):
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"""Returns an object including a module or module and class"""
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try:
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__import__(import_str)
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return sys.modules[import_str]
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except ImportError:
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cls = import_class(import_str)
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return cls()
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def fetchfile(url, target):
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logging.debug("Fetching %s" % url)
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# c = pycurl.Curl()
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# fp = open(target, "wb")
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# c.setopt(c.URL, url)
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# c.setopt(c.WRITEDATA, fp)
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# c.perform()
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# c.close()
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# fp.close()
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execute("curl --fail %s -o %s" % (url, target))
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def execute(cmd, process_input=None, addl_env=None, check_exit_code=True):
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logging.debug("Running cmd: %s", cmd)
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env = os.environ.copy()
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if addl_env:
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env.update(addl_env)
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obj = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
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result = None
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if process_input != None:
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result = obj.communicate(process_input)
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else:
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result = obj.communicate()
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obj.stdin.close()
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if obj.returncode:
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logging.debug("Result was %s" % (obj.returncode))
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if check_exit_code and obj.returncode != 0:
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(stdout, stderr) = result
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raise ProcessExecutionError(exit_code=obj.returncode,
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stdout=stdout,
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stderr=stderr,
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cmd=cmd)
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return result
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def abspath(s):
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return os.path.join(os.path.dirname(__file__), s)
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# TODO(sirp): when/if utils is extracted to common library, we should remove
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# the argument's default.
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#def default_flagfile(filename='nova.conf'):
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def default_flagfile(filename='quantum.conf'):
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for arg in sys.argv:
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if arg.find('flagfile') != -1:
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break
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else:
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if not os.path.isabs(filename):
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# turn relative filename into an absolute path
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script_dir = os.path.dirname(inspect.stack()[-1][1])
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filename = os.path.abspath(os.path.join(script_dir, filename))
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if os.path.exists(filename):
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sys.argv = \
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sys.argv[:1] + ['--flagfile=%s' % filename] + sys.argv[1:]
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def debug(arg):
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logging.debug('debug in callback: %s', arg)
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return arg
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def runthis(prompt, cmd, check_exit_code=True):
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logging.debug("Running %s" % (cmd))
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exit_code = subprocess.call(cmd.split(" "))
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logging.debug(prompt % (exit_code))
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if check_exit_code and exit_code != 0:
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raise ProcessExecutionError(exit_code=exit_code,
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stdout=None,
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stderr=None,
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cmd=cmd)
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def generate_uid(topic, size=8):
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return '%s-%s' % (topic, ''.join(
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[random.choice('01234567890abcdefghijklmnopqrstuvwxyz')
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for x in xrange(size)]))
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def generate_mac():
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mac = [0x02, 0x16, 0x3e, random.randint(0x00, 0x7f),
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random.randint(0x00, 0xff), random.randint(0x00, 0xff)]
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return ':'.join(map(lambda x: "%02x" % x, mac))
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def last_octet(address):
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return int(address.split(".")[-1])
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def isotime(at=None):
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if not at:
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at = datetime.datetime.utcnow()
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return at.strftime(TIME_FORMAT)
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def parse_isotime(timestr):
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return datetime.datetime.strptime(timestr, TIME_FORMAT)
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def getPluginFromConfig(file="config.ini"):
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Config = ConfigParser.ConfigParser()
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Config.read(file)
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return Config.get("PLUGIN", "provider")
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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, **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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def __get_backend(self):
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if not self.__backend:
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backend_name = self.__pivot.value
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if backend_name not in self.__backends:
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raise exception.Error('Invalid backend: %s' % backend_name)
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backend = self.__backends[backend_name]
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if type(backend) == type(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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logging.info('backend %s', self.__backend)
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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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