70ea188f5d
Currently max number of client connections(i.e greenlets spawned at a time) opened at any time by the WSGI server is set to 100 with wsgi_default_pool_size[1]. This configuration may be fine for neutron api server. But with wsgi_default_pool_size(=100) requests, state change server is creating heavy cpu load on agent. So this server(which run on agents) need lesser value i.e can be configured to half the number of cpu on agent We use "ha_keepalived_state_change_server_threads" config option to configure number of threads in state change server instead of wsgi_default_pool_size. [1] https://review.openstack.org/#/c/278007/ DocImpact: Add new config option - ha_keepalived_state_change_server_threads, to configure number of threads in state change server. Closes-Bug: #1581580 Change-Id: I822ea3844792a7731fd24419b7e90e5aef141993
377 lines
13 KiB
Python
377 lines
13 KiB
Python
# Copyright 2012 Locaweb.
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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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import fcntl
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import glob
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import grp
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import os
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import pwd
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import shlex
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import socket
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import struct
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import threading
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import debtcollector
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import eventlet
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from eventlet.green import subprocess
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from eventlet import greenthread
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from neutron_lib import constants
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_rootwrap import client
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from oslo_utils import encodeutils
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from oslo_utils import excutils
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from six.moves import http_client as httplib
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from neutron._i18n import _, _LE
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from neutron.agent.common import config
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from neutron.common import utils
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from neutron import wsgi
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LOG = logging.getLogger(__name__)
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class RootwrapDaemonHelper(object):
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__client = None
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__lock = threading.Lock()
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def __new__(cls):
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"""There is no reason to instantiate this class"""
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raise NotImplementedError()
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@classmethod
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def get_client(cls):
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with cls.__lock:
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if cls.__client is None:
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cls.__client = client.Client(
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shlex.split(cfg.CONF.AGENT.root_helper_daemon))
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return cls.__client
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def addl_env_args(addl_env):
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"""Build arguments for adding additional environment vars with env"""
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# NOTE (twilson) If using rootwrap, an EnvFilter should be set up for the
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# command instead of a CommandFilter.
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if addl_env is None:
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return []
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return ['env'] + ['%s=%s' % pair for pair in addl_env.items()]
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def create_process(cmd, run_as_root=False, addl_env=None):
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"""Create a process object for the given command.
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The return value will be a tuple of the process object and the
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list of command arguments used to create it.
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"""
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cmd = list(map(str, addl_env_args(addl_env) + cmd))
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if run_as_root:
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cmd = shlex.split(config.get_root_helper(cfg.CONF)) + cmd
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LOG.debug("Running command: %s", cmd)
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obj = utils.subprocess_popen(cmd, shell=False,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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return obj, cmd
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def execute_rootwrap_daemon(cmd, process_input, addl_env):
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cmd = list(map(str, addl_env_args(addl_env) + cmd))
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# NOTE(twilson) oslo_rootwrap.daemon will raise on filter match
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# errors, whereas oslo_rootwrap.cmd converts them to return codes.
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# In practice, no neutron code should be trying to execute something that
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# would throw those errors, and if it does it should be fixed as opposed to
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# just logging the execution error.
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LOG.debug("Running command (rootwrap daemon): %s", cmd)
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client = RootwrapDaemonHelper.get_client()
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return client.execute(cmd, process_input)
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def execute(cmd, process_input=None, addl_env=None,
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check_exit_code=True, return_stderr=False, log_fail_as_error=True,
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extra_ok_codes=None, run_as_root=False):
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try:
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if process_input is not None:
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_process_input = encodeutils.to_utf8(process_input)
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else:
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_process_input = None
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if run_as_root and cfg.CONF.AGENT.root_helper_daemon:
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returncode, _stdout, _stderr = (
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execute_rootwrap_daemon(cmd, process_input, addl_env))
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else:
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obj, cmd = create_process(cmd, run_as_root=run_as_root,
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addl_env=addl_env)
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_stdout, _stderr = obj.communicate(_process_input)
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returncode = obj.returncode
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obj.stdin.close()
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_stdout = utils.safe_decode_utf8(_stdout)
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_stderr = utils.safe_decode_utf8(_stderr)
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extra_ok_codes = extra_ok_codes or []
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if returncode and returncode not in extra_ok_codes:
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msg = _("Exit code: %(returncode)d; "
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"Stdin: %(stdin)s; "
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"Stdout: %(stdout)s; "
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"Stderr: %(stderr)s") % {
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'returncode': returncode,
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'stdin': process_input or '',
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'stdout': _stdout,
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'stderr': _stderr}
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if log_fail_as_error:
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LOG.error(msg)
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if check_exit_code:
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raise RuntimeError(msg)
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else:
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LOG.debug("Exit code: %d", returncode)
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finally:
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# NOTE(termie): this appears to be necessary to let the subprocess
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# call clean something up in between calls, without
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# it two execute calls in a row hangs the second one
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greenthread.sleep(0)
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return (_stdout, _stderr) if return_stderr else _stdout
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def get_interface_mac(interface):
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MAC_START = 18
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MAC_END = 24
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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dev = interface[:constants.DEVICE_NAME_MAX_LEN]
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dev = encodeutils.to_utf8(dev)
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info = fcntl.ioctl(s.fileno(), 0x8927, struct.pack('256s', dev))
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return ''.join(['%02x:' % ord(char)
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for char in info[MAC_START:MAC_END]])[:-1]
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def find_child_pids(pid):
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"""Retrieve a list of the pids of child processes of the given pid."""
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try:
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raw_pids = execute(['ps', '--ppid', pid, '-o', 'pid='],
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log_fail_as_error=False)
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except RuntimeError as e:
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# Unexpected errors are the responsibility of the caller
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with excutils.save_and_reraise_exception() as ctxt:
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# Exception has already been logged by execute
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no_children_found = 'Exit code: 1' in str(e)
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if no_children_found:
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ctxt.reraise = False
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return []
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return [x.strip() for x in raw_pids.split('\n') if x.strip()]
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def _get_conf_base(cfg_root, uuid, ensure_conf_dir):
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#TODO(mangelajo): separate responsibilities here, ensure_conf_dir
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# should be a separate function
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conf_dir = os.path.abspath(os.path.normpath(cfg_root))
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conf_base = os.path.join(conf_dir, uuid)
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if ensure_conf_dir:
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utils.ensure_dir(conf_dir)
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return conf_base
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def get_conf_file_name(cfg_root, uuid, cfg_file, ensure_conf_dir=False):
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"""Returns the file name for a given kind of config file."""
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conf_base = _get_conf_base(cfg_root, uuid, ensure_conf_dir)
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return "%s.%s" % (conf_base, cfg_file)
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def get_value_from_file(filename, converter=None):
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try:
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with open(filename, 'r') as f:
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try:
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return converter(f.read()) if converter else f.read()
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except ValueError:
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LOG.error(_LE('Unable to convert value in %s'), filename)
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except IOError:
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LOG.debug('Unable to access %s', filename)
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def remove_conf_files(cfg_root, uuid):
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conf_base = _get_conf_base(cfg_root, uuid, False)
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for file_path in glob.iglob("%s.*" % conf_base):
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os.unlink(file_path)
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def get_root_helper_child_pid(pid, expected_cmd, run_as_root=False):
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"""
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Get the first non root_helper child pid in the process hierarchy.
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If root helper was used, two or more processes would be created:
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- a root helper process (e.g. sudo myscript)
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- possibly a rootwrap script (e.g. neutron-rootwrap)
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- a child process (e.g. myscript)
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- possibly its child processes
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Killing the root helper process will leave the child process
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running, re-parented to init, so the only way to ensure that both
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die is to target the child process directly.
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"""
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pid = str(pid)
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if run_as_root:
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while True:
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try:
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# We shouldn't have more than one child per process
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# so keep getting the children of the first one
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pid = find_child_pids(pid)[0]
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except IndexError:
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return # We never found the child pid with expected_cmd
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# If we've found a pid with no root helper, return it.
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# If we continue, we can find transient children.
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if pid_invoked_with_cmdline(pid, expected_cmd):
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break
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return pid
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def remove_abs_path(cmd):
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"""Remove absolute path of executable in cmd
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Note: New instance of list is returned
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:param cmd: parsed shlex command (e.g. ['/bin/foo', 'param1', 'param two'])
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"""
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if cmd and os.path.isabs(cmd[0]):
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cmd = list(cmd)
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cmd[0] = os.path.basename(cmd[0])
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return cmd
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def get_cmdline_from_pid(pid):
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if pid is None or not os.path.exists('/proc/%s' % pid):
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return []
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with open('/proc/%s/cmdline' % pid, 'r') as f:
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return f.readline().split('\0')[:-1]
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def cmd_matches_expected(cmd, expected_cmd):
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abs_cmd = remove_abs_path(cmd)
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abs_expected_cmd = remove_abs_path(expected_cmd)
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if abs_cmd != abs_expected_cmd:
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# Commands executed with #! are prefixed with the script
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# executable. Check for the expected cmd being a subset of the
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# actual cmd to cover this possibility.
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abs_cmd = remove_abs_path(abs_cmd[1:])
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return abs_cmd == abs_expected_cmd
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def pid_invoked_with_cmdline(pid, expected_cmd):
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"""Validate process with given pid is running with provided parameters
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"""
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cmd = get_cmdline_from_pid(pid)
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return cmd_matches_expected(cmd, expected_cmd)
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wait_until_true = debtcollector.moves.moved_function(
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utils.wait_until_true, 'wait_until_true', __name__,
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version='Newton', removal_version='Ocata')
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def ensure_directory_exists_without_file(path):
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dirname = os.path.dirname(path)
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if os.path.isdir(dirname):
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try:
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os.unlink(path)
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except OSError:
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with excutils.save_and_reraise_exception() as ctxt:
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if not os.path.exists(path):
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ctxt.reraise = False
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else:
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utils.ensure_dir(dirname)
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def is_effective_user(user_id_or_name):
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"""Returns True if user_id_or_name is effective user (id/name)."""
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euid = os.geteuid()
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if str(user_id_or_name) == str(euid):
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return True
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effective_user_name = pwd.getpwuid(euid).pw_name
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return user_id_or_name == effective_user_name
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def is_effective_group(group_id_or_name):
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"""Returns True if group_id_or_name is effective group (id/name)."""
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egid = os.getegid()
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if str(group_id_or_name) == str(egid):
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return True
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effective_group_name = grp.getgrgid(egid).gr_name
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return group_id_or_name == effective_group_name
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class UnixDomainHTTPConnection(httplib.HTTPConnection):
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"""Connection class for HTTP over UNIX domain socket."""
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def __init__(self, host, port=None, strict=None, timeout=None,
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proxy_info=None):
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httplib.HTTPConnection.__init__(self, host, port, strict)
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self.timeout = timeout
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self.socket_path = cfg.CONF.metadata_proxy_socket
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def connect(self):
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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if self.timeout:
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self.sock.settimeout(self.timeout)
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self.sock.connect(self.socket_path)
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class UnixDomainHttpProtocol(eventlet.wsgi.HttpProtocol):
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# TODO(jlibosva): This is just a workaround not to set TCP_NODELAY on
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# socket due to 40714b1ffadd47b315ca07f9b85009448f0fe63d evenlet change
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# This should be removed once
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# https://github.com/eventlet/eventlet/issues/301 is fixed
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disable_nagle_algorithm = False
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def __init__(self, request, client_address, server):
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if client_address == '':
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client_address = ('<local>', 0)
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# base class is old-style, so super does not work properly
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eventlet.wsgi.HttpProtocol.__init__(self, request, client_address,
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server)
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class UnixDomainWSGIServer(wsgi.Server):
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def __init__(self, name, num_threads=None):
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self._socket = None
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self._launcher = None
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self._server = None
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super(UnixDomainWSGIServer, self).__init__(name, disable_ssl=True,
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num_threads=num_threads)
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def start(self, application, file_socket, workers, backlog, mode=None):
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self._socket = eventlet.listen(file_socket,
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family=socket.AF_UNIX,
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backlog=backlog)
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if mode is not None:
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os.chmod(file_socket, mode)
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self._launch(application, workers=workers)
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def _run(self, application, socket):
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"""Start a WSGI service in a new green thread."""
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logger = logging.getLogger('eventlet.wsgi.server')
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eventlet.wsgi.server(socket,
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application,
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max_size=self.num_threads,
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protocol=UnixDomainHttpProtocol,
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log=logger)
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