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463 lines
17 KiB
Python
463 lines
17 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# (c) 2012, Jeroen Hoekx <jeroen@hoekx.be>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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import socket
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import datetime
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import time
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import sys
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import re
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import binascii
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HAS_PSUTIL = False
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try:
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import psutil
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HAS_PSUTIL = True
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# just because we can import it on Linux doesn't mean we will use it
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except ImportError:
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pass
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DOCUMENTATION = '''
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---
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module: wait_for
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short_description: Waits for a condition before continuing.
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description:
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- Waiting for a port to become available is useful for when services
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are not immediately available after their init scripts return -
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which is true of certain Java application servers. It is also
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useful when starting guests with the M(virt) module and
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needing to pause until they are ready.
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- This module can also be used to wait for a regex match a string to be present in a file.
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- In 1.6 and later, this module can
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also be used to wait for a file to be available or absent on the
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filesystem.
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- In 1.8 and later, this module can also be used to wait for active
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connections to be closed before continuing, useful if a node
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is being rotated out of a load balancer pool.
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version_added: "0.7"
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options:
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host:
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description:
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- hostname or IP address to wait for
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required: false
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default: "127.0.0.1"
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aliases: []
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timeout:
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description:
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- maximum number of seconds to wait for
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required: false
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default: 300
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delay:
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description:
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- number of seconds to wait before starting to poll
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required: false
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default: 0
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port:
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description:
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- port number to poll
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required: false
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state:
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description:
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- either C(present), C(started), or C(stopped), C(absent), or C(drained)
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- When checking a port C(started) will ensure the port is open, C(stopped) will check that it is closed, C(drained) will check for active connections
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- When checking for a file or a search string C(present) or C(started) will ensure that the file or string is present before continuing, C(absent) will check that file is absent or removed
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choices: [ "present", "started", "stopped", "absent", "drained" ]
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default: "started"
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path:
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version_added: "1.4"
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required: false
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description:
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- path to a file on the filesytem that must exist before continuing
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search_regex:
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version_added: "1.4"
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required: false
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description:
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- Can be used to match a string in either a file or a socket connection. Defaults to a multiline regex.
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exclude_hosts:
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version_added: "1.8"
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required: false
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description:
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- list of hosts or IPs to ignore when looking for active TCP connections for C(drained) state
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notes:
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- The ability to use search_regex with a port connection was added in 1.7.
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requirements: []
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author: Jeroen Hoekx, John Jarvis, Andrii Radyk
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'''
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EXAMPLES = '''
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# wait 300 seconds for port 8000 to become open on the host, don't start checking for 10 seconds
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- wait_for: port=8000 delay=10
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# wait 300 seconds for port 8000 of any IP to close active connections, don't start checking for 10 seconds
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- wait_for: host=0.0.0.0 port=8000 delay=10 state=drained
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# wait 300 seconds for port 8000 of any IP to close active connections, ignoring connections for specified hosts
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- wait_for: host=0.0.0.0 port=8000 state=drained exclude_hosts=10.2.1.2,10.2.1.3
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# wait until the file /tmp/foo is present before continuing
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- wait_for: path=/tmp/foo
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# wait until the string "completed" is in the file /tmp/foo before continuing
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- wait_for: path=/tmp/foo search_regex=completed
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# wait until the lock file is removed
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- wait_for: path=/var/lock/file.lock state=absent
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# wait until the process is finished and pid was destroyed
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- wait_for: path=/proc/3466/status state=absent
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# Wait 300 seconds for port 22 to become open and contain "OpenSSH", don't start checking for 10 seconds
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- local_action: wait_for port=22 host="{{ inventory_hostname }}" search_regex=OpenSSH delay=10
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'''
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class TCPConnectionInfo(object):
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"""
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This is a generic TCP Connection Info strategy class that relies
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on the psutil module, which is not ideal for targets, but necessary
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for cross platform support.
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A subclass may wish to override some or all of these methods.
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- _get_exclude_ips()
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- get_active_connections()
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All subclasses MUST define platform and distribution (which may be None).
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"""
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platform = 'Generic'
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distribution = None
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match_all_ips = {
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socket.AF_INET: '0.0.0.0',
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socket.AF_INET6: '::',
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}
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connection_states = {
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'01': 'ESTABLISHED',
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'02': 'SYN_SENT',
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'03': 'SYN_RECV',
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'04': 'FIN_WAIT1',
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'05': 'FIN_WAIT2',
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'06': 'TIME_WAIT',
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}
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def __new__(cls, *args, **kwargs):
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return load_platform_subclass(TCPConnectionInfo, args, kwargs)
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def __init__(self, module):
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self.module = module
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(self.family, self.ip) = _convert_host_to_ip(self.module.params['host'])
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self.port = int(self.module.params['port'])
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self.exclude_ips = self._get_exclude_ips()
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if not HAS_PSUTIL:
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module.fail_json(msg="psutil module required for wait_for")
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def _get_exclude_ips(self):
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if self.module.params['exclude_hosts'] is None:
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return []
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exclude_hosts = self.module.params['exclude_hosts'].split(',')
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return [ _convert_host_to_hex(h)[1] for h in exclude_hosts ]
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def get_active_connections_count(self):
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active_connections = 0
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for p in psutil.process_iter():
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connections = p.get_connections(kind='inet')
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for conn in connections:
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if conn.status not in self.connection_states.values():
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continue
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(local_ip, local_port) = conn.local_address
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if self.port == local_port and self.ip in [self.match_all_ips[self.family], local_ip]:
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(remote_ip, remote_port) = conn.remote_address
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if remote_ip not in self.exclude_ips:
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active_connections += 1
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return active_connections
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# ===========================================
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# Subclass: Linux
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class LinuxTCPConnectionInfo(TCPConnectionInfo):
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"""
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This is a TCP Connection Info evaluation strategy class
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that utilizes information from Linux's procfs. While less universal,
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does allow Linux targets to not require an additional library.
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"""
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platform = 'Linux'
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distribution = None
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source_file = {
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socket.AF_INET: '/proc/net/tcp',
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socket.AF_INET6: '/proc/net/tcp6'
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}
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match_all_ips = {
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socket.AF_INET: '00000000',
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socket.AF_INET6: '00000000000000000000000000000000',
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}
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local_address_field = 1
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remote_address_field = 2
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connection_state_field = 3
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def __init__(self, module):
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self.module = module
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(self.family, self.ip) = _convert_host_to_hex(module.params['host'])
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self.port = "%0.4X" % int(module.params['port'])
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self.exclude_ips = self._get_exclude_ips()
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def _get_exclude_ips(self):
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if self.module.params['exclude_hosts'] is None:
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return []
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exclude_hosts = self.module.params['exclude_hosts'].split(',')
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return [ _convert_host_to_hex(h) for h in exclude_hosts ]
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def get_active_connections_count(self):
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active_connections = 0
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f = open(self.source_file[self.family])
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for tcp_connection in f.readlines():
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tcp_connection = tcp_connection.strip().split(' ')
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if tcp_connection[self.local_address_field] == 'local_address':
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continue
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if tcp_connection[self.connection_state_field] not in self.connection_states:
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continue
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(local_ip, local_port) = tcp_connection[self.local_address_field].split(':')
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if self.port == local_port and self.ip in [self.match_all_ips[self.family], local_ip]:
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(remote_ip, remote_port) = tcp_connection[self.remote_address_field].split(':')
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if remote_ip not in self.exclude_ips:
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active_connections += 1
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f.close()
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return active_connections
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def _convert_host_to_ip(host):
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"""
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Perform forward DNS resolution on host, IP will give the same IP
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Args:
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host: String with either hostname, IPv4, or IPv6 address
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Returns:
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Tuple containing address family and IP
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"""
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addrinfo = socket.getaddrinfo(host, 80, 0, 0, socket.SOL_TCP)[0]
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return (addrinfo[0], addrinfo[4][0])
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def _convert_host_to_hex(host):
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"""
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Convert the provided host to the format in /proc/net/tcp*
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/proc/net/tcp uses little-endian four byte hex for ipv4
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/proc/net/tcp6 uses little-endian per 4B word for ipv6
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Args:
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host: String with either hostname, IPv4, or IPv6 address
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Returns:
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Tuple containing address family and the little-endian converted host
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"""
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(family, ip) = _convert_host_to_ip(host)
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hexed = binascii.hexlify(socket.inet_pton(family, ip)).upper()
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if family == socket.AF_INET:
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hexed = _little_endian_convert_32bit(hexed)
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elif family == socket.AF_INET6:
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# xrange loops through each 8 character (4B) set in the 128bit total
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hexed = "".join([ _little_endian_convert_32bit(hexed[x:x+8]) for x in xrange(0, 32, 8) ])
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return (family, hexed)
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def _little_endian_convert_32bit(block):
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"""
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Convert to little-endian, effectively transposing
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the order of the four byte word
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12345678 -> 78563412
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Args:
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block: String containing a 4 byte hex representation
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Returns:
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String containing the little-endian converted block
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"""
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# xrange starts at 6, and increments by -2 until it reaches -2
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# which lets us start at the end of the string block and work to the begining
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return "".join([ block[x:x+2] for x in xrange(6, -2, -2) ])
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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host=dict(default='127.0.0.1'),
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timeout=dict(default=300),
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connect_timeout=dict(default=5),
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delay=dict(default=0),
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port=dict(default=None),
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path=dict(default=None),
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search_regex=dict(default=None),
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state=dict(default='started', choices=['started', 'stopped', 'present', 'absent', 'drained']),
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exclude_hosts=dict(default=None, type='list')
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),
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)
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params = module.params
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host = params['host']
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timeout = int(params['timeout'])
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connect_timeout = int(params['connect_timeout'])
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delay = int(params['delay'])
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if params['port']:
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port = int(params['port'])
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else:
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port = None
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state = params['state']
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path = params['path']
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search_regex = params['search_regex']
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if params['exclude_hosts']:
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exclude_hosts = params['exclude_hosts'].split(',')
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else:
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exclude_hosts = []
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if port and path:
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module.fail_json(msg="port and path parameter can not both be passed to wait_for")
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if path and state == 'stopped':
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module.fail_json(msg="state=stopped should only be used for checking a port in the wait_for module")
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if path and state == 'drained':
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module.fail_json(msg="state=drained should only be used for checking a port in the wait_for module")
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if exclude_hosts and state != 'drained':
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module.fail_json(msg="exclude_hosts should only be with state=drained")
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start = datetime.datetime.now()
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if delay:
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time.sleep(delay)
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if state in [ 'stopped', 'absent' ]:
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### first wait for the stop condition
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end = start + datetime.timedelta(seconds=timeout)
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while datetime.datetime.now() < end:
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if path:
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try:
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f = open(path)
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f.close()
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time.sleep(1)
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pass
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except IOError:
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break
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elif port:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(connect_timeout)
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try:
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s.connect( (host, port) )
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s.shutdown(socket.SHUT_RDWR)
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s.close()
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time.sleep(1)
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except:
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break
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else:
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elapsed = datetime.datetime.now() - start
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if port:
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module.fail_json(msg="Timeout when waiting for %s:%s to stop." % (host, port), elapsed=elapsed.seconds)
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elif path:
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module.fail_json(msg="Timeout when waiting for %s to be absent." % (path), elapsed=elapsed.seconds)
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elif state in ['started', 'present']:
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### wait for start condition
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end = start + datetime.timedelta(seconds=timeout)
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while datetime.datetime.now() < end:
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if path:
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try:
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os.stat(path)
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if search_regex:
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try:
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f = open(path)
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try:
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if re.search(search_regex, f.read(), re.MULTILINE):
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break
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else:
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time.sleep(1)
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finally:
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f.close()
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except IOError:
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time.sleep(1)
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pass
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else:
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break
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except OSError, e:
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# File not present
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if e.errno == 2:
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time.sleep(1)
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else:
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elapsed = datetime.datetime.now() - start
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module.fail_json(msg="Failed to stat %s, %s" % (path, e.strerror), elapsed=elapsed.seconds)
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elif port:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(connect_timeout)
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try:
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s.connect( (host, port) )
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if search_regex:
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data = ''
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matched = False
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while 1:
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data += s.recv(1024)
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if not data:
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break
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elif re.search(search_regex, data, re.MULTILINE):
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matched = True
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break
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if matched:
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s.shutdown(socket.SHUT_RDWR)
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s.close()
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break
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else:
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s.shutdown(socket.SHUT_RDWR)
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s.close()
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break
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except:
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time.sleep(1)
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pass
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else:
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elapsed = datetime.datetime.now() - start
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if port:
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if search_regex:
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module.fail_json(msg="Timeout when waiting for search string %s in %s:%s" % (search_regex, host, port), elapsed=elapsed.seconds)
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else:
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module.fail_json(msg="Timeout when waiting for %s:%s" % (host, port), elapsed=elapsed.seconds)
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elif path:
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if search_regex:
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module.fail_json(msg="Timeout when waiting for search string %s in %s" % (search_regex, path), elapsed=elapsed.seconds)
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else:
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module.fail_json(msg="Timeout when waiting for file %s" % (path), elapsed=elapsed.seconds)
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elif state == 'drained':
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### wait until all active connections are gone
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end = start + datetime.timedelta(seconds=timeout)
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tcpconns = TCPConnectionInfo(module)
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while datetime.datetime.now() < end:
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try:
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if tcpconns.get_active_connections_count() == 0:
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break
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except IOError:
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pass
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time.sleep(1)
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else:
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elapsed = datetime.datetime.now() - start
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module.fail_json(msg="Timeout when waiting for %s:%s to drain" % (host, port), elapsed=elapsed.seconds)
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elapsed = datetime.datetime.now() - start
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module.exit_json(state=state, port=port, search_regex=search_regex, path=path, elapsed=elapsed.seconds)
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# import module snippets
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from ansible.module_utils.basic import *
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main()
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