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community.general/lib/ansible/runner.py

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# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
#
################################################
import multiprocessing
import signal
import os
import pwd
import Queue
import random
import traceback
import tempfile
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import time
import base64
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import getpass
import codecs
import ansible.constants as C
import ansible.connection
import ansible.inventory
from ansible import utils
from ansible import errors
from ansible import callbacks as ans_callbacks
HAS_ATFORK=True
try:
from Crypto.Random import atfork
except ImportError:
HAS_ATFORK=False
################################################
def _executor_hook(job_queue, result_queue):
''' callback used by multiprocessing pool '''
# attempt workaround of https://github.com/newsapps/beeswithmachineguns/issues/17
# does not occur for everyone, some claim still occurs on newer paramiko
# this function not present in CentOS 6
if HAS_ATFORK:
atfork()
signal.signal(signal.SIGINT, signal.SIG_IGN)
while not job_queue.empty():
try:
job = job_queue.get(block=False)
runner, host = job
result_queue.put(runner._executor(host))
except Queue.Empty:
pass
except:
traceback.print_exc()
################################################
class Runner(object):
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def __init__(self,
host_list=C.DEFAULT_HOST_LIST, module_path=C.DEFAULT_MODULE_PATH,
module_name=C.DEFAULT_MODULE_NAME, module_args=C.DEFAULT_MODULE_ARGS,
forks=C.DEFAULT_FORKS, timeout=C.DEFAULT_TIMEOUT,
pattern=C.DEFAULT_PATTERN, remote_user=C.DEFAULT_REMOTE_USER,
remote_pass=C.DEFAULT_REMOTE_PASS, remote_port=C.DEFAULT_REMOTE_PORT,
sudo_pass=C.DEFAULT_SUDO_PASS, background=0, basedir=None,
setup_cache=None, transport=C.DEFAULT_TRANSPORT, conditional='True',
callbacks=None, debug=False, sudo=False, sudo_user=C.DEFAULT_SUDO_USER,
module_vars=None, is_playbook=False, inventory=None):
"""
host_list : path to a host list file, like /etc/ansible/hosts
module_path : path to modules, like /usr/share/ansible
module_name : which module to run (string)
module_args : args to pass to the module (string)
forks : desired level of paralellism (hosts to run on at a time)
timeout : connection timeout, such as a SSH timeout, in seconds
pattern : pattern or groups to select from in inventory
remote_user : connect as this remote username
remote_pass : supply this password (if not using keys)
remote_port : use this default remote port (if not set by the inventory system)
sudo_user : If you want to sudo to a user other than root.
sudo_pass : sudo password if using sudo and sudo requires a password
background : run asynchronously with a cap of this many # of seconds (if not 0)
basedir : paths used by modules if not absolute are relative to here
setup_cache : this is a internalism that is going away
transport : transport mode (paramiko, local)
conditional : only execute if this string, evaluated, is True
callbacks : output callback class
sudo : log in as remote user and immediately sudo to root
module_vars : provides additional variables to a template. FIXME: just use module_args, remove
is_playbook : indicates Runner is being used by a playbook. affects behavior in various ways.
inventory : inventory object, if host_list is not provided
"""
if setup_cache is None:
setup_cache = {}
if basedir is None:
basedir = os.getcwd()
if callbacks is None:
callbacks = ans_callbacks.DefaultRunnerCallbacks()
self.callbacks = callbacks
self.generated_jid = str(random.randint(0, 999999999999))
self.sudo_user = sudo_user
self.transport = transport
self.connector = ansible.connection.Connection(self, self.transport, self.sudo_user)
if inventory is None:
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self.inventory = ansible.inventory.Inventory(host_list)
else:
self.inventory = inventory
if module_vars is None:
module_vars = {}
self.setup_cache = setup_cache
self.conditional = conditional
self.module_path = module_path
self.module_name = module_name
self.forks = int(forks)
self.pattern = pattern
self.module_args = module_args
self.module_vars = module_vars
self.timeout = timeout
self.debug = debug
self.remote_user = remote_user
self.remote_pass = remote_pass
self.remote_port = remote_port
self.background = background
self.basedir = basedir
self.sudo = sudo
self.sudo_pass = sudo_pass
self.is_playbook = is_playbook
euid = pwd.getpwuid(os.geteuid())[0]
if self.transport == 'local' and self.remote_user != euid:
raise Exception("User mismatch: expected %s, but is %s" % (self.remote_user, euid))
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if type(self.module_args) not in [str, unicode, dict]:
raise Exception("module_args must be a string or dict: %s" % self.module_args)
self._tmp_paths = {}
random.seed()
# *****************************************************
def _return_from_module(self, conn, host, result, err, executed=None):
''' helper function to handle JSON parsing of results '''
try:
result = utils.parse_json(result)
if executed is not None:
result['invocation'] = executed
if 'stderr' in result:
err="%s%s"%(err,result['stderr'])
return [host, True, result, err]
except Exception, e:
return [host, False, "%s/%s/%s" % (str(e), result, executed), err]
# *****************************************************
def _delete_remote_files(self, conn, files):
''' deletes one or more remote files '''
if type(files) == str:
files = [ files ]
for filename in files:
if filename.find('/tmp/') == -1:
raise Exception("not going to happen")
self._exec_command(conn, "rm -rf %s" % filename, None)
# *****************************************************
def _transfer_module(self, conn, tmp, module):
''' transfers a module file to the remote side to execute it, but does not execute it yet '''
outpath = self._copy_module(conn, tmp, module)
self._exec_command(conn, "chmod +x %s" % outpath, tmp)
return outpath
# *****************************************************
def _transfer_str(self, conn, tmp, name, data):
''' transfer string to remote file '''
if type(data) == dict:
data = utils.smjson(data)
afd, afile = tempfile.mkstemp()
afo = os.fdopen(afd, 'w')
afo.write(data.encode("utf8"))
afo.flush()
afo.close()
remote = os.path.join(tmp, name)
conn.put_file(afile, remote)
os.unlink(afile)
return remote
# *****************************************************
def _add_setup_vars(self, inject, args):
''' setup module variables need special handling '''
is_dict = False
if type(args) == dict:
is_dict = True
# TODO: keep this as a dict through the whole path to simplify this code
for (k,v) in inject.iteritems():
if not k.startswith('facter_') and not k.startswith('ohai_') and not k.startswith('ansible_'):
if not is_dict:
if str(v).find(" ") != -1:
v = "\"%s\"" % v
args += " %s=%s" % (k, str(v).replace(" ","~~~"))
else:
args[k]=v
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return args
# *****************************************************
def _add_setup_metadata(self, args):
''' automatically determine where to store variables for the setup module '''
is_dict = False
if type(args) == dict:
is_dict = True
# TODO: keep this as a dict through the whole path to simplify this code
if not is_dict:
if args.find("metadata=") == -1:
if self.remote_user == 'root':
args = "%s metadata=/etc/ansible/setup" % args
else:
args = "%s metadata=$HOME/.ansible/setup" % args
else:
if not 'metadata' in args:
if self.remote_user == 'root':
args['metadata'] = '/etc/ansible/setup'
else:
args['metadata'] = "$HOME/.ansible/setup"
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return args
# *****************************************************
def _execute_module(self, conn, tmp, remote_module_path, args,
async_jid=None, async_module=None, async_limit=None):
''' runs a module that has already been transferred '''
inject = self.setup_cache.get(conn.host,{})
conditional = utils.double_template(self.conditional, inject, self.setup_cache)
if not eval(conditional):
return [ utils.smjson(dict(skipped=True)), None, 'skipped' ]
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host_variables = self.inventory.get_variables(conn.host)
inject.update(host_variables)
if self.module_name == 'setup':
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args = self._add_setup_vars(inject, args)
args = self._add_setup_metadata(args)
if type(args) == dict:
args = utils.bigjson(args)
args = utils.template(args, inject, self.setup_cache)
module_name_tail = remote_module_path.split("/")[-1]
argsfile = self._transfer_str(conn, tmp, 'arguments', args)
if async_jid is None:
cmd = "%s %s" % (remote_module_path, argsfile)
else:
cmd = " ".join([str(x) for x in [remote_module_path, async_jid, async_limit, async_module, argsfile]])
res, err = self._exec_command(conn, cmd, tmp, sudoable=True)
client_executed_str = "%s %s" % (module_name_tail, args.strip())
return ( res, err, client_executed_str )
# *****************************************************
def _save_setup_result_to_disk(self, conn, result):
''' cache results of calling setup '''
dest = os.path.expanduser("~/.ansible_setup_data")
user = getpass.getuser()
if user == 'root':
dest = "/var/lib/ansible/setup_data"
if not os.path.exists(dest):
os.makedirs(dest)
fh = open(os.path.join(dest, conn.host), "w")
fh.write(result)
fh.close()
return result
# *****************************************************
def _add_result_to_setup_cache(self, conn, result):
''' allows discovered variables to be used in templates and action statements '''
host = conn.host
if 'ansible_facts' in result:
var_result = result['ansible_facts']
else:
var_result = {}
# note: do not allow variables from playbook to be stomped on
# by variables coming up from facter/ohai/etc. They
# should be prefixed anyway
if not host in self.setup_cache:
self.setup_cache[host] = {}
for (k, v) in var_result.iteritems():
if not k in self.setup_cache[host]:
self.setup_cache[host][k] = v
# *****************************************************
def _execute_normal_module(self, conn, host, tmp, module_name):
''' transfer & execute a module that is not 'copy' or 'template' '''
# shell and command are the same module
if module_name == 'shell':
module_name = 'command'
self.module_args += " #USE_SHELL"
module = self._transfer_module(conn, tmp, module_name)
(result, err, executed) = self._execute_module(conn, tmp, module, self.module_args)
(host, ok, data, err) = self._return_from_module(conn, host, result, err, executed)
if ok:
self._add_result_to_setup_cache(conn, data)
return (host, ok, data, err)
# *****************************************************
def _execute_async_module(self, conn, host, tmp, module_name):
''' transfer the given module name, plus the async module, then run it '''
# hack to make the 'shell' module keyword really be executed
# by the command module
module_args = self.module_args
if module_name == 'shell':
module_name = 'command'
module_args += " #USE_SHELL"
async = self._transfer_module(conn, tmp, 'async_wrapper')
module = self._transfer_module(conn, tmp, module_name)
(result, err, executed) = self._execute_module(conn, tmp, async, module_args,
async_module=module,
async_jid=self.generated_jid,
async_limit=self.background
)
return self._return_from_module(conn, host, result, err, executed)
# *****************************************************
def _execute_copy(self, conn, host, tmp):
''' handler for file transfer operations '''
# load up options
options = utils.parse_kv(self.module_args)
source = options.get('src', None)
dest = options.get('dest', None)
if (source is None and not 'first_available_file' in self.module_vars) or dest is None:
return (host, True, dict(failed=True, msg="src and dest are required"), '')
# apply templating to source argument
inject = self.setup_cache.get(conn.host,{})
# FIXME: break duplicate code up into subfunction
# if we have first_available_file in our vars
# look up the files and use the first one we find as src
if 'first_available_file' in self.module_vars:
found = False
for fn in self.module_vars.get('first_available_file'):
fn = utils.template(fn, inject, self.setup_cache)
if os.path.exists(fn):
source = fn
found = True
break
if not found:
return (host, True, dict(failed=True, msg="could not find src in first_available_file list"), '')
source = utils.template(source, inject, self.setup_cache)
# transfer the file to a remote tmp location
tmp_src = tmp + source.split('/')[-1]
conn.put_file(utils.path_dwim(self.basedir, source), tmp_src)
# install the copy module
self.module_name = 'copy'
module = self._transfer_module(conn, tmp, 'copy')
# run the copy module
args = "src=%s dest=%s" % (tmp_src, dest)
(result1, err, executed) = self._execute_module(conn, tmp, module, args)
(host, ok, data, err) = self._return_from_module(conn, host, result1, err, executed)
if ok:
return self._chain_file_module(conn, tmp, data, err, options, executed)
else:
return (host, ok, data, err)
# *****************************************************
def _execute_fetch(self, conn, host, tmp):
''' handler for fetch operations '''
# load up options
options = utils.parse_kv(self.module_args)
source = options.get('src', None)
dest = options.get('dest', None)
if source is None or dest is None:
return (host, True, dict(failed=True, msg="src and dest are required"), '')
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# apply templating to source argument
inject = self.setup_cache.get(conn.host,{})
source = utils.template(source, inject, self.setup_cache)
# files are saved in dest dir, with a subdir for each host, then the filename
dest = "%s/%s/%s" % (utils.path_dwim(self.basedir, dest), host, source)
dest = dest.replace("//","/")
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# apply templating to dest argument
dest = utils.template(dest, inject, self.setup_cache)
# compare old and new md5 for support of change hooks
local_md5 = None
if os.path.exists(dest):
local_md5 = os.popen("md5sum %s" % dest).read().split()[0]
remote_md5 = self._exec_command(conn, "md5sum %s" % source, tmp, True)[0].split()[0]
if remote_md5 != local_md5:
# create the containing directories, if needed
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os.makedirs(os.path.dirname(dest))
# fetch the file and check for changes
conn.fetch_file(source, dest)
new_md5 = os.popen("md5sum %s" % dest).read().split()[0]
if new_md5 != remote_md5:
return (host, True, dict(failed=True, msg="md5 mismatch", md5sum=new_md5), '')
return (host, True, dict(changed=True, md5sum=new_md5), '')
else:
return (host, True, dict(changed=False, md5sum=local_md5), '')
# *****************************************************
def _chain_file_module(self, conn, tmp, data, err, options, executed):
''' handles changing file attribs after copy/template operations '''
old_changed = data.get('changed', False)
module = self._transfer_module(conn, tmp, 'file')
args = ' '.join([ "%s=%s" % (k,v) for (k,v) in options.items() ])
(result2, err2, executed2) = self._execute_module(conn, tmp, module, args)
results2 = self._return_from_module(conn, conn.host, result2, err2, executed)
(host, ok, data2, err2) = results2
if ok:
new_changed = data2.get('changed', False)
data.update(data2)
else:
new_changed = False
if old_changed or new_changed:
data['changed'] = True
return (host, ok, data, "%s%s"%(err,err2))
# *****************************************************
def _execute_template(self, conn, host, tmp):
''' handler for template operations '''
# load up options
options = utils.parse_kv(self.module_args)
source = options.get('src', None)
dest = options.get('dest', None)
metadata = options.get('metadata', None)
if (source is None and 'first_available_file' not in self.module_vars) or dest is None:
return (host, True, dict(failed=True, msg="src and dest are required"), '')
# apply templating to source argument so vars can be used in the path
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inject = self.setup_cache.get(conn.host,{})
# if we have first_available_file in our vars
# look up the files and use the first one we find as src
if 'first_available_file' in self.module_vars:
found = False
for fn in self.module_vars.get('first_available_file'):
fn = utils.template(fn, inject, self.setup_cache)
if os.path.exists(fn):
source = fn
found = True
break
if not found:
return (host, True, dict(failed=True, msg="could not find src in first_available_file list"), '')
source = utils.template(source, inject, self.setup_cache)
(host, ok, data, err) = (None, None, None, None)
if not self.is_playbook:
# not running from a playbook so we have to fetch the remote
# setup file contents before proceeding...
if metadata is None:
if self.remote_user == 'root':
metadata = '/etc/ansible/setup'
else:
# path is expanded on remote side
metadata = "~/.ansible/setup"
# install the template module
slurp_module = self._transfer_module(conn, tmp, 'slurp')
# run the slurp module to get the metadata file
args = "src=%s" % metadata
(result1, err, executed) = self._execute_module(conn, tmp, slurp_module, args)
result1 = utils.json_loads(result1)
if not 'content' in result1 or result1.get('encoding','base64') != 'base64':
result1['failed'] = True
return self._return_from_module(conn, host, result1, err, executed)
content = base64.b64decode(result1['content'])
inject = utils.json_loads(content)
# install the template module
copy_module = self._transfer_module(conn, tmp, 'copy')
# template the source data locally
source_data = codecs.open(utils.path_dwim(self.basedir, source), encoding="utf8").read()
resultant = ''
try:
resultant = utils.template(source_data, inject, self.setup_cache, no_engine=False)
except Exception, e:
return (host, False, dict(failed=True, msg=str(e)), '')
xfered = self._transfer_str(conn, tmp, 'source', resultant)
# run the COPY module
args = "src=%s dest=%s" % (xfered, dest)
(result1, err, executed) = self._execute_module(conn, tmp, copy_module, args)
(host, ok, data, err) = self._return_from_module(conn, host, result1, err, executed)
# modify file attribs if needed
if ok:
executed = executed.replace("copy","template",1)
return self._chain_file_module(conn, tmp, data, err, options, executed)
else:
return (host, ok, data, err)
# *****************************************************
def _executor(self, host):
try:
(host, ok, data, err) = self._executor_internal(host)
if not ok:
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self.callbacks.on_unreachable(host, data)
return (host, ok, data)
except errors.AnsibleError, ae:
msg = str(ae)
self.callbacks.on_unreachable(host, msg)
return [host, False, msg]
except Exception:
msg = traceback.format_exc()
self.callbacks.on_unreachable(host, msg)
return [host, False, msg]
def _executor_internal(self, host):
''' callback executed in parallel for each host. returns (hostname, connected_ok, extra) '''
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host_variables = self.inventory.get_variables(host)
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port = host_variables.get('ansible_ssh_port', self.remote_port)
conn = None
try:
conn = self.connector.connect(host, port)
except errors.AnsibleConnectionFailed, e:
return [ host, False, "FAILED: %s" % str(e), None ]
cache = self.setup_cache.get(host, {})
module_name = utils.template(self.module_name, cache, self.setup_cache)
tmp = self._get_tmp_path(conn)
result = None
if self.module_name == 'copy':
result = self._execute_copy(conn, host, tmp)
elif self.module_name == 'fetch':
result = self._execute_fetch(conn, host, tmp)
elif self.module_name == 'template':
result = self._execute_template(conn, host, tmp)
else:
if self.background == 0:
result = self._execute_normal_module(conn, host, tmp, module_name)
else:
result = self._execute_async_module(conn, host, tmp, module_name)
self._delete_remote_files(conn, tmp)
conn.close()
(host, connect_ok, data, err) = result
if not connect_ok:
self.callbacks.on_unreachable(host, data)
else:
if 'failed' in data or 'rc' in data and str(data['rc']) != '0':
self.callbacks.on_failed(host, data)
elif 'skipped' in data:
self.callbacks.on_skipped(host)
else:
self.callbacks.on_ok(host, data)
if err:
if self.debug or data.get('parsed', True) == False:
self.callbacks.on_error(host, err)
return result
# *****************************************************
def _exec_command(self, conn, cmd, tmp, sudoable=False):
''' execute a command string over SSH, return the output '''
sudo_user = self.sudo_user
stdin, stdout, stderr = conn.exec_command(cmd, tmp, sudo_user, sudoable=sudoable)
err=None
out=None
if type(stderr) != str:
err="\n".join(stderr.readlines())
else:
err=stderr
if type(stdout) != str:
out="\n".join(stdout.readlines())
else:
out=stdout
return (out,err)
# *****************************************************
def _get_tmp_path(self, conn):
''' gets a temporary path on a remote box '''
# The problem with this is that it's executed on the
# overlord, not on the target so we can't use tempdir and os.path
# Only support the *nix world for now by using the $HOME env var
basetmp = "/var/tmp"
if self.remote_user != 'root':
basetmp = "$HOME/.ansible/tmp"
cmd = "mktemp -d %s/ansible.XXXXXX" % basetmp
if self.remote_user != 'root':
cmd = "mkdir -p %s && %s" % (basetmp, cmd)
result, err = self._exec_command(conn, cmd, None, sudoable=False)
cleaned = result.split("\n")[0].strip() + '/'
return cleaned
# *****************************************************
def _copy_module(self, conn, tmp, module):
''' transfer a module over SFTP, does not run it '''
if module.startswith("/"):
raise errors.AnsibleFileNotFound("%s is not a module" % module)
in_path = os.path.expanduser(os.path.join(self.module_path, module))
if not os.path.exists(in_path):
raise errors.AnsibleFileNotFound("module not found: %s" % in_path)
out_path = tmp + module
conn.put_file(in_path, out_path)
return out_path
# *****************************************************
def _parallel_exec(self, hosts):
''' handles mulitprocessing when more than 1 fork is required '''
job_queue = multiprocessing.Manager().Queue()
[job_queue.put(i) for i in hosts]
result_queue = multiprocessing.Manager().Queue()
workers = []
for i in range(self.forks):
prc = multiprocessing.Process(target=_executor_hook,
args=(job_queue, result_queue))
prc.start()
workers.append(prc)
try:
for worker in workers:
worker.join()
except KeyboardInterrupt:
for worker in workers:
worker.terminate()
worker.join()
results = []
while not result_queue.empty():
results.append(result_queue.get(block=False))
return results
# *****************************************************
def _partition_results(self, results):
''' seperate results by ones we contacted & ones we didn't '''
results2 = dict(contacted={}, dark={})
if results is None:
return None
for result in results:
(host, contacted_ok, result) = result
if contacted_ok:
results2["contacted"][host] = result
else:
results2["dark"][host] = result
# hosts which were contacted but never got a chance to return
for host in self.inventory.list_hosts(self.pattern):
if not (host in results2['dark'] or host in results2['contacted']):
results2["dark"][host] = {}
return results2
# *****************************************************
def run(self):
''' xfer & run module on all matched hosts '''
# find hosts that match the pattern
hosts = self.inventory.list_hosts(self.pattern)
if len(hosts) == 0:
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self.callbacks.on_no_hosts()
return dict(contacted={}, dark={})
hosts = [ (self,x) for x in hosts ]
results = None
if self.forks > 1:
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results = self._parallel_exec(hosts)
else:
results = [ self._executor(h[1]) for h in hosts ]
return self._partition_results(results)
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def runAsync(self, time_limit):
''' Run this module asynchronously and return a poller. '''
self.background = time_limit
results = self.run()
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return results, AsyncPoller(results, self)
class AsyncPoller(object):
""" Manage asynchronous jobs. """
def __init__(self, results, runner):
self.runner = runner
self.results = { 'contacted': {}, 'dark': {}}
self.hosts_to_poll = []
self.completed = False
# Get job id and which hosts to poll again in the future
jid = None
for (host, res) in results['contacted'].iteritems():
if res.get('started', False):
self.hosts_to_poll.append(host)
jid = res.get('ansible_job_id', None)
else:
self.results['contacted'][host] = res
for (host, res) in results['dark'].iteritems():
self.results['dark'][host] = res
if jid is None:
raise errors.AnsibleError("unexpected error: unable to determine jid")
if len(self.hosts_to_poll)==0:
raise errors.AnsibleErrot("unexpected error: no hosts to poll")
self.jid = jid
def poll(self):
""" Poll the job status.
Returns the changes in this iteration."""
self.runner.module_name = 'async_status'
self.runner.module_args = "jid=%s" % self.jid
self.runner.pattern = "*"
self.runner.background = 0
self.runner.inventory.restrict_to(self.hosts_to_poll)
results = self.runner.run()
self.runner.inventory.lift_restriction()
hosts = []
poll_results = { 'contacted': {}, 'dark': {}, 'polled': {}}
for (host, res) in results['contacted'].iteritems():
if res.get('started',False):
hosts.append(host)
poll_results['polled'][host] = res
else:
self.results['contacted'][host] = res
poll_results['contacted'][host] = res
if 'failed' in res:
self.runner.callbacks.on_async_failed(host, res, self.jid)
else:
self.runner.callbacks.on_async_ok(host, res, self.jid)
for (host, res) in results['dark'].iteritems():
self.results['dark'][host] = res
poll_results['dark'][host] = res
self.runner.callbacks.on_async_failed(host, res, self.jid)
self.hosts_to_poll = hosts
if len(hosts)==0:
self.completed = True
return poll_results
def wait(self, seconds, poll_interval):
""" Wait a certain time for job completion, check status every poll_interval. """
clock = seconds - poll_interval
while (clock >= 0 and not self.completed):
time.sleep(poll_interval)
poll_results = self.poll()
for (host, res) in poll_results['polled'].iteritems():
if res.get('started'):
self.runner.callbacks.on_async_poll(host, res, self.jid, clock)
clock = clock - poll_interval
return self.results