ansible/bin/ansible

#!/usr/bin/python

# (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 sys
import getpass
import shlex
import time
from optparse import OptionParser

import ansible.runner
import ansible.constants as C
from ansible import utils
from ansible import errors
from ansible import callbacks

########################################################

class Cli(object):
    ''' code behind bin/ansible '''
    
    # ----------------------------------------------     

    def __init__(self):
        self.stats = callbacks.AggregateStats()
        self.callbacks = callbacks.CliRunnerCallbacks()
        self.silent_callbacks = callbacks.DefaultRunnerCallbacks()

    # ----------------------------------------------     

    def parse(self):
        ''' create an options parser for bin/ansible '''

        parser = OptionParser(usage = 'ansible <host-pattern> [options]')
        parser.add_option("-a", "--args", dest="module_args",
            help="module arguments", default=C.DEFAULT_MODULE_ARGS)
        parser.add_option("-B", "--background", dest="seconds", type='int', default=0,
            help="run asynchronously, failing after X seconds")
        parser.add_option('-f','--forks', dest='forks', default=C.DEFAULT_FORKS, type='int',
            help='number of parallel processes to use')
        parser.add_option("-i", "--inventory-file", dest="inventory",
           help="inventory host file", default=C.DEFAULT_HOST_LIST)
        parser.add_option("-k", "--ask-pass", default=False, action="store_true",
            help="ask for SSH password")
        parser.add_option("-M", "--module-path", dest="module_path",
           help="path to module library", default=C.DEFAULT_MODULE_PATH)
        parser.add_option("-m", "--module-name", dest="module_name",
            help="module name to execute", default=C.DEFAULT_MODULE_NAME)
        parser.add_option('-o', '--one-line', dest='one_line', action='store_true',
            help="condense output")
        parser.add_option('-P', '--poll', default=C.DEFAULT_POLL_INTERVAL, type='int',
            dest='poll_interval', help="set the poll interval if using -B")
        parser.add_option('-t', '--tree', dest='tree', default=None,
            help="log output to this directory")
        parser.add_option('-T', '--timeout', default=C.DEFAULT_TIMEOUT, type='int',
            dest='timeout', help="set the SSH timeout in seconds")
        parser.add_option('-u', '--user', default=C.DEFAULT_REMOTE_USER,
            dest='remote_user', help='connect as this user')
        options, args = parser.parse_args()
        self.callbacks.options = options        

        if len(args) == 0 or len(args) > 1:
            parser.print_help()
            sys.exit(1)
        return (options, args)   
    
    # ----------------------------------------------     
 
    def run(self, options, args):
        ''' use Runner lib to do SSH things '''

        pattern = args[0]
        sshpass = None
        if options.ask_pass:
            sshpass = getpass.getpass(prompt="SSH password: ")
        
        if options.tree:
            utils.prepare_writeable_dir(options.tree)

        if options.seconds:
            print "background launch...\n\n"

        runner = ansible.runner.Runner(
            module_name=options.module_name, module_path=options.module_path,
            module_args=shlex.split(options.module_args),
            remote_user=options.remote_user, remote_pass=sshpass,
            host_list=options.inventory, timeout=options.timeout,
            forks=options.forks, background=options.seconds, pattern=pattern, 
            callbacks=self.callbacks, verbose=True,
        )
        return (runner, runner.run())


    # ----------------------------------------------

    def get_polling_runner(self, old_runner, hosts, 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,
            timeout=old_runner.timeout, forks=old_runner.forks,
            pattern='*', callbacks=self.silent_callbacks, verbose=True,
        )

    # ----------------------------------------------

    def hosts_to_poll(self, results):
        hosts = []
        for (host, res) in results['contacted'].iteritems():
            if res.get('started',False):
                hosts.append(host)
        return hosts

    # ----------------------------------------------     

    def poll_if_needed(self, runner, results, options, args):
        ''' summarize results from Runner '''

        if results is None:
           exit("No hosts matched")

        # BACKGROUND POLL LOGIC when -B and -P are specified
        # FIXME: refactor
        if options.seconds and options.poll_interval > 0:
            poll_hosts = results['contacted'].keys()
            if len(poll_hosts) == 0:
                exit("no jobs were launched successfully")
            ahost = poll_hosts[0]
            jid = results['contacted'][ahost].get('ansible_job_id', None)
            if jid is None:
                exit("unexpected error: unable to determine jid")

            clock = options.seconds
            while (clock >= 0):
                polling_runner = self.get_polling_runner(runner, poll_hosts, jid)
                poll_results = polling_runner.run()
                if poll_results is None:
                    break
                for (host, host_result) in poll_results['contacted'].iteritems():
                    # override last result with current status result for report
                    results['contacted'][host] = host_result
                    print utils.async_poll_status(jid, host, clock, host_result)
                for (host, host_result) in poll_results['dark'].iteritems():
                    print "FAILED: %s => %s" % (host, host_result)
                clock = clock - options.poll_interval
                time.sleep(options.poll_interval)
                poll_hosts = self.hosts_to_poll(poll_results)

########################################################

if __name__ == '__main__':
    cli = Cli()
    (options, args) = cli.parse()
    try:
        (runner, results) = cli.run(options, args)
    except errors.AnsibleError as e:
        # Generic handler for ansible specific errors
        print "ERROR: %s" % str(e)
        sys.exit(1)
    else:
        cli.poll_if_needed(runner, results, options, args)