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Refactor inventory code out of Runner.

Browse source 
This introduces the Inventory class.

Playbook uses the internals of Runner to limit the number of hosts to poll
asynchronously. To accomodate this, Inventory can be restricted to specific
hosts.
This commit is contained in:
Jeroen Hoekx 2012-04-13 14:39:54 +02:00
parent 31d4ee32d1
commit c5cae87eca
4 changed files with 241 additions and 176 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
bin/ansible
View file

@ -98,11 +98,11 @@ class Cli(object):
# ----------------------------------------------
def get_polling_runner(self, old_runner, hosts, jid):
def get_polling_runner(self, old_runner, jid):
return ansible.runner.Runner(
module_name='async_status', module_path=old_runner.module_path,
module_args="jid=%s" % jid, remote_user=old_runner.remote_user,
remote_pass=old_runner.remote_pass, host_list=hosts,
remote_pass=old_runner.remote_pass, inventory=old_runner.inventory,
timeout=old_runner.timeout, forks=old_runner.forks,
remote_port=old_runner.remote_port, pattern='*',
callbacks=self.silent_callbacks, verbose=True,
@ -138,8 +138,10 @@ class Cli(object):
clock = options.seconds
while (clock >= 0):
polling_runner = self.get_polling_runner(runner, poll_hosts, jid)
runner.inventory.restrict_to(poll_hosts)
polling_runner = self.get_polling_runner(runner, jid)
poll_results = polling_runner.run()
runner.inventory.lift_restrictions()
if poll_results is None:
break
for (host, host_result) in poll_results['contacted'].iteritems():

189
lib/ansible/inventory.py Normal file
View file

@ -0,0 +1,189 @@
# (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 fnmatch
import os
import subprocess
import constants as C
from ansible import errors
from ansible import utils
class Inventory(object):
""" Host inventory for ansible.
The inventory is either a simple text file with systems and [groups] of
systems, or a script that will be called with --list or --host.
"""
def __init__(self, host_list=C.DEFAULT_HOST_LIST, extra_vars=None):
self._restriction = None
if type(host_list) == list:
self.host_list = host_list
self.groups = dict(ungrouped=host_list)
self._is_script = False
return
inventory_file = os.path.expanduser(host_list)
if not os.path.exists(inventory_file):
raise errors.AnsibleFileNotFound("inventory file not found: %s" % host_list)
self.inventory_file = os.path.abspath(inventory_file)
if os.access(self.inventory_file, os.X_OK):
self.host_list, self.groups = self._parse_from_script(extra_vars)
self._is_script = True
else:
self.host_list, self.groups = self._parse_from_file()
self._is_script = False
# *****************************************************
# Public API
def list_hosts(self, pattern="all"):
""" Return a list of hosts [matching the pattern] """
if self._restriction is None:
host_list = self.host_list
else:
host_list = [ h for h in self.host_list if h in self._restriction ]
return [ h for h in host_list if self._matches(h, pattern) ]
def restrict_to(self, restriction):
""" Restrict list operations to the hosts given in restriction """
if type(restriction)!=list:
restriction = [ restriction ]
self._restriction = restriction
def lift_restriction(self):
""" Do not restrict list operations """
self._restriction = None
def get_variables(self, host, extra_vars=None):
""" Return the variables associated with this host. """
if not self._is_script:
return {}
return self._get_variables_from_script(host, extra_vars)
# *****************************************************
def _parse_from_file(self):
''' parse a textual host file '''
results = []
groups = dict(ungrouped=[])
lines = file(self.inventory_file).read().split("\n")
group_name = 'ungrouped'
for item in lines:
item = item.lstrip().rstrip()
if item.startswith("#"):
# ignore commented out lines
pass
elif item.startswith("["):
# looks like a group
group_name = item.replace("[","").replace("]","").lstrip().rstrip()
groups[group_name] = []
elif item != "":
# looks like a regular host
groups[group_name].append(item)
if not item in results:
results.append(item)
return (results, groups)
# *****************************************************
def _parse_from_script(self, extra_vars=None):
''' evaluate a script that returns list of hosts by groups '''
results = []
groups = dict(ungrouped=[])
cmd = [self.inventory_file, '--list']
if extra_vars:
cmd.extend(['--extra-vars', extra_vars])
cmd = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=False)
out, err = cmd.communicate()
rc = cmd.returncode
if rc:
raise errors.AnsibleError("%s: %s" % self.inventory_file, err)
try:
groups = utils.json_loads(out)
except:
raise errors.AnsibleError("invalid JSON response from script: %s" % self.inventory_file)
for (groupname, hostlist) in groups.iteritems():
for host in hostlist:
if host not in results:
results.append(host)
return (results, groups)
# *****************************************************
def _get_variables_from_script(self, host, extra_vars=None):
''' support per system variabes from external variable scripts, see web docs '''
cmd = [self.inventory_file, '--host', host]
if extra_vars:
cmd.extend(['--extra-vars', extra_vars])
cmd = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
shell=False
)
out, err = cmd.communicate()
variables = {}
try:
variables = utils.json_loads(out)
except:
raise errors.AnsibleError("%s returned invalid result when called with hostname %s" % (
self.inventory_file,
host
))
return variables
def _matches(self, host_name, pattern):
''' returns if a hostname is matched by the pattern '''
# a pattern is in fnmatch format but more than one pattern
# can be strung together with semicolons. ex:
# atlanta-web*.example.com;dc-web*.example.com
if host_name == '':
return False
pattern = pattern.replace(";",":")
subpatterns = pattern.split(":")
for subpattern in subpatterns:
if subpattern == 'all':
return True
if fnmatch.fnmatch(host_name, subpattern):
return True
elif subpattern in self.groups:
if host_name in self.groups[subpattern]:
return True
return False

62
lib/ansible/playbook.py
View file

@ -17,6 +17,7 @@
#############################################
import ansible.inventory
import ansible.runner
import ansible.constants as C
from ansible import utils
@ -68,7 +69,6 @@ class PlayBook(object):
if playbook is None or callbacks is None or runner_callbacks is None or stats is None:
raise Exception('missing required arguments')
self.host_list = host_list
self.module_path = module_path
self.forks = forks
self.timeout = timeout
@ -88,9 +88,13 @@ class PlayBook(object):
self.basedir = os.path.dirname(playbook)
self.playbook = self._parse_playbook(playbook)
self.host_list, self.groups = ansible.runner.Runner.parse_hosts(
host_list, override_hosts=self.override_hosts, extra_vars=self.extra_vars)
if override_hosts is not None:
if type(override_hosts) != list:
raise errors.AnsibleError("override hosts must be a list")
self.inventory = ansible.inventory.Inventory(override_hosts)
else:
self.inventory = ansible.inventory.Inventory(host_list)
# *****************************************************
def _get_vars(self, play, dirname):
@ -233,7 +237,6 @@ class PlayBook(object):
def _async_poll(self, runner, hosts, async_seconds, async_poll_interval, only_if):
''' launch an async job, if poll_interval is set, wait for completion '''
runner.host_list = hosts
runner.background = async_seconds
results = runner.run()
self.stats.compute(results, poll=True)
@ -257,7 +260,7 @@ class PlayBook(object):
return results
clock = async_seconds
runner.host_list = self.hosts_to_poll(results)
host_list = self.hosts_to_poll(results)
poll_results = results
while (clock >= 0):
@ -267,11 +270,13 @@ class PlayBook(object):
runner.module_name = 'async_status'
runner.background = 0
runner.pattern = '*'
self.inventory.restrict_to(host_list)
poll_results = runner.run()
self.stats.compute(poll_results, poll=True)
runner.host_list = self.hosts_to_poll(poll_results)
host_list = self.hosts_to_poll(poll_results)
self.inventory.lift_restriction()
if len(runner.host_list) == 0:
if len(host_list) == 0:
break
if poll_results is None:
break
@ -298,15 +303,16 @@ class PlayBook(object):
# *****************************************************
def _run_module(self, pattern, host_list, module, args, vars, remote_user,
def _run_module(self, pattern, module, args, vars, remote_user,
async_seconds, async_poll_interval, only_if, sudo, transport):
''' run a particular module step in a playbook '''
hosts = [ h for h in host_list if (h not in self.stats.failures) and (h not in self.stats.dark)]
hosts = [ h for h in self.inventory.list_hosts() if (h not in self.stats.failures) and (h not in self.stats.dark)]
self.inventory.restrict_to(hosts)
runner = ansible.runner.Runner(
pattern=pattern, groups=self.groups, module_name=module,
module_args=args, host_list=hosts, forks=self.forks,
pattern=pattern, inventory=self.inventory, module_name=module,
module_args=args, forks=self.forks,
remote_pass=self.remote_pass, module_path=self.module_path,
timeout=self.timeout, remote_user=remote_user,
remote_port=self.remote_port, module_vars=vars,
@ -317,13 +323,16 @@ class PlayBook(object):
)
if async_seconds == 0:
return runner.run()
results = runner.run()
else:
return self._async_poll(runner, hosts, async_seconds, async_poll_interval, only_if)
results = self._async_poll(runner, hosts, async_seconds, async_poll_interval, only_if)
self.inventory.lift_restriction()
return results
# *****************************************************
def _run_task(self, pattern=None, host_list=None, task=None,
def _run_task(self, pattern=None, task=None,
remote_user=None, handlers=None, conditional=False, sudo=False, transport=None):
''' run a single task in the playbook and recursively run any subtasks. '''
@ -354,7 +363,7 @@ class PlayBook(object):
# load up an appropriate ansible runner to
# run the task in parallel
results = self._run_module(pattern, host_list, module_name,
results = self._run_module(pattern, module_name,
module_args, module_vars, remote_user, async_seconds,
async_poll_interval, only_if, sudo, transport)
@ -406,7 +415,7 @@ class PlayBook(object):
# *****************************************************
def _do_conditional_imports(self, vars_files, host_list):
def _do_conditional_imports(self, vars_files):
''' handle the vars_files section, which can contain variables '''
# FIXME: save parsed variable results in memory to avoid excessive re-reading/parsing
@ -417,7 +426,7 @@ class PlayBook(object):
if type(vars_files) != list:
raise errors.AnsibleError("vars_files must be a list")
for host in host_list:
for host in self.inventory.list_hosts():
cache_vars = SETUP_CACHE.get(host,{})
SETUP_CACHE[host] = cache_vars
for filename in vars_files:
@ -460,16 +469,18 @@ class PlayBook(object):
if vars_files is not None:
self.callbacks.on_setup_secondary()
self._do_conditional_imports(vars_files, self.host_list)
self._do_conditional_imports(vars_files)
else:
self.callbacks.on_setup_primary()
host_list = [ h for h in self.host_list if not (h in self.stats.failures or h in self.stats.dark) ]
host_list = [ h for h in self.inventory.list_hosts(pattern)
if not (h in self.stats.failures or h in self.stats.dark) ]
self.inventory.restrict_to(host_list)
# push any variables down to the system
setup_results = ansible.runner.Runner(
pattern=pattern, groups=self.groups, module_name='setup',
module_args=vars, host_list=host_list,
pattern=pattern, module_name='setup',
module_args=vars, inventory=self.inventory,
forks=self.forks, module_path=self.module_path,
timeout=self.timeout, remote_user=user,
remote_pass=self.remote_pass, remote_port=self.remote_port,
@ -479,6 +490,8 @@ class PlayBook(object):
).run()
self.stats.compute(setup_results, setup=True)
self.inventory.lift_restriction()
# now for each result, load into the setup cache so we can
# let runner template out future commands
setup_ok = setup_results.get('contacted', {})
@ -494,7 +507,6 @@ class PlayBook(object):
SETUP_CACHE[h].update(extra_vars)
except:
SETUP_CACHE[h] = extra_vars
return host_list
# *****************************************************
@ -530,7 +542,6 @@ class PlayBook(object):
for task in tasks:
self._run_task(
pattern=pattern,
host_list=self.host_list,
task=task,
handlers=handlers,
remote_user=user,
@ -547,16 +558,17 @@ class PlayBook(object):
for task in handlers:
triggered_by = task.get('run', None)
if type(triggered_by) == list:
self.inventory.restrict_to(triggered_by)
self._run_task(
pattern=pattern,
task=task,
handlers=[],
host_list=triggered_by,
conditional=True,
remote_user=user,
sudo=sudo,
transport=transport
)
self.inventory.lift_restriction()
# end of execution for this particular pattern. Multiple patterns
# can be in a single playbook file

158
lib/ansible/runner.py
View file

@ -18,7 +18,6 @@
################################################
import fnmatch
import multiprocessing
import signal
import os
@ -27,10 +26,10 @@ import Queue
import random
import traceback
import tempfile
import subprocess
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
@ -67,8 +66,6 @@ def _executor_hook(job_queue, result_queue):
class Runner(object):
_external_variable_script = None
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,
@ -76,7 +73,7 @@ class Runner(object):
sudo_pass=C.DEFAULT_SUDO_PASS, remote_port=C.DEFAULT_REMOTE_PORT, background=0,
basedir=None, setup_cache=None, transport=C.DEFAULT_TRANSPORT,
conditional='True', groups={}, callbacks=None, verbose=False,
debug=False, sudo=False, extra_vars=None, module_vars=None):
debug=False, sudo=False, extra_vars=None, module_vars=None, inventory=None):
if setup_cache is None:
setup_cache = {}
@ -92,11 +89,10 @@ class Runner(object):
self.transport = transport
self.connector = ansible.connection.Connection(self, self.transport)
if type(host_list) == str:
self.host_list, self.groups = self.parse_hosts(host_list)
if inventory is None:
self.inventory = ansible.inventory.Inventory(host_list, extra_vars)
else:
self.host_list = host_list
self.groups = groups
self.inventory = inventory
self.setup_cache = setup_cache
self.conditional = conditional
@ -130,106 +126,6 @@ class Runner(object):
# *****************************************************
@classmethod
def parse_hosts_from_regular_file(cls, host_list):
''' parse a textual host file '''
results = []
groups = dict(ungrouped=[])
lines = file(host_list).read().split("\n")
group_name = 'ungrouped'
for item in lines:
item = item.lstrip().rstrip()
if item.startswith("#"):
# ignore commented out lines
pass
elif item.startswith("["):
# looks like a group
group_name = item.replace("[","").replace("]","").lstrip().rstrip()
groups[group_name] = []
elif item != "":
# looks like a regular host
groups[group_name].append(item)
if not item in results:
results.append(item)
return (results, groups)
# *****************************************************
@classmethod
def parse_hosts_from_script(cls, host_list, extra_vars):
''' evaluate a script that returns list of hosts by groups '''
results = []
groups = dict(ungrouped=[])
host_list = os.path.abspath(host_list)
cls._external_variable_script = host_list
cmd = [host_list, '--list']
if extra_vars:
cmd.extend(['--extra-vars', extra_vars])
cmd = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=False)
out, err = cmd.communicate()
rc = cmd.returncode
if rc:
raise errors.AnsibleError("%s: %s" % (host_list, err))
try:
groups = utils.json_loads(out)
except:
raise errors.AnsibleError("invalid JSON response from script: %s" % host_list)
for (groupname, hostlist) in groups.iteritems():
for host in hostlist:
if host not in results:
results.append(host)
return (results, groups)
# *****************************************************
@classmethod
def parse_hosts(cls, host_list, override_hosts=None, extra_vars=None):
''' parse the host inventory file, returns (hosts, groups) '''
if override_hosts is not None:
if type(override_hosts) != list:
raise errors.AnsibleError("override hosts must be a list")
return (override_hosts, dict(ungrouped=override_hosts))
if type(host_list) == list:
raise Exception("function can only be called on inventory files")
host_list = os.path.expanduser(host_list)
if not os.path.exists(host_list):
raise errors.AnsibleFileNotFound("inventory file not found: %s" % host_list)
if not os.access(host_list, os.X_OK):
return Runner.parse_hosts_from_regular_file(host_list)
else:
return Runner.parse_hosts_from_script(host_list, extra_vars)
# *****************************************************
def _matches(self, host_name, pattern):
''' returns if a hostname is matched by the pattern '''
# a pattern is in fnmatch format but more than one pattern
# can be strung together with semicolons. ex:
# atlanta-web*.example.com;dc-web*.example.com
if host_name == '':
return False
pattern = pattern.replace(";",":")
subpatterns = pattern.split(":")
for subpattern in subpatterns:
if subpattern == 'all':
return True
if fnmatch.fnmatch(host_name, subpattern):
return True
elif subpattern in self.groups:
if host_name in self.groups[subpattern]:
return True
return False
# *****************************************************
def _connect(self, host):
''' connects to a host, returns (is_successful, connection_object OR traceback_string) '''
@ -296,34 +192,6 @@ class Runner(object):
# *****************************************************
def _add_variables_from_script(self, conn, inject):
''' support per system variabes from external variable scripts, see web docs '''
host = conn.host
cmd = [Runner._external_variable_script, '--host', host]
if self.extra_vars:
cmd.extend(['--extra-vars', self.extra_vars])
cmd = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
shell=False
)
out, err = cmd.communicate()
inject2 = {}
try:
inject2 = utils.json_loads(out)
except:
raise errors.AnsibleError("%s returned invalid result when called with hostname %s" % (
Runner._external_variable_script,
host
))
# store injected variables in the templates
inject.update(inject2)
# *****************************************************
def _add_setup_vars(self, inject, args):
''' setup module variables need special handling '''
@ -377,8 +245,9 @@ class Runner(object):
if not eval(conditional):
return [ utils.smjson(dict(skipped=True)), None, 'skipped' ]
if Runner._external_variable_script is not None:
self._add_variables_from_script(conn, inject)
host_variables = self.inventory.get_variables(conn.host, self.extra_vars)
inject.update(host_variables)
if self.module_name == 'setup':
args = self._add_setup_vars(inject, args)
args = self._add_setup_metadata(args)
@ -692,13 +561,6 @@ class Runner(object):
# *****************************************************
def _match_hosts(self, pattern):
''' return all matched hosts fitting a pattern '''
return [ h for h in self.host_list if self._matches(h, pattern) ]
# *****************************************************
def _parallel_exec(self, hosts):
''' handles mulitprocessing when more than 1 fork is required '''
@ -745,7 +607,7 @@ class Runner(object):
results2["dark"][host] = result
# hosts which were contacted but never got a chance to return
for host in self._match_hosts(self.pattern):
for host in self.inventory.list_hosts(self.pattern):
if not (host in results2['dark'] or host in results2['contacted']):
results2["dark"][host] = {}
@ -757,7 +619,7 @@ class Runner(object):
''' xfer & run module on all matched hosts '''
# find hosts that match the pattern
hosts = self._match_hosts(self.pattern)
hosts = self.inventory.list_hosts(self.pattern)
if len(hosts) == 0:
self.callbacks.on_no_hosts()
return dict(contacted={}, dark={})