#!/usr/bin/env python
#Copyright (c) 2012 Yahoo! Inc. All rights reserved.
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.
"""
 Python based ssh multiplexer optimized for map operations
 command line utility.
"""
import os
import sys
import optparse
import getpass
import sshmap
import hostlists

if __name__ == "__main__":
    parser = optparse.OptionParser()
    parser.add_option("--output_json", dest="output_json",
                      default=False, action="store_true",
                      help = "Output in JSON format")
    parser.add_option("--output_base64", dest="output_base64", default=False,
                      action="store_true", help="Output in base64 format")
    parser.add_option("--summarize_failed", dest = "summarize_failed", default = False, action = "store_true",
                      help = "Print a list of hosts that failed at the end")
    parser.add_option("--aggregate_output", "--collapse", dest = "aggregate_output", default = False,
                      action = "store_true", help = "Aggregate identical list")
    parser.add_option("--only_output", dest = "only_output", default = False, action = "store_true",
                      help = "Only print lines for hosts that return output")
    parser.add_option("--jobs", "-j", dest = "jobs", default = 65, type = "int",
                      help = "Number of parallel commands to execute")
    parser.add_option("--timeout", dest = "timeout", type = "int", default = 0, help = "Timeout, or 0 for no timeout")
    parser.add_option("--sort", dest = "sort", default = False, action = "store_true",
                      help = "Print output sorted in the order listed")
    parser.add_option("--shuffle", dest = "shuffle", default = False, action = "store_true",
                      help = "Shuffle (randomize) the order of hosts")
    parser.add_option("--print_rc", dest = "print_rc", default = False, action = "store_true",
                      help = "Print the return code value")
    parser.add_option("--match", dest = "match", default = None,
                      help = "Only show host output if the string is found in the output")
    parser.add_option("--runscript", "--run_script", dest = "runscript", default = None,
                      help = "Run a script on all hosts.  The command value is the shell to pass the script to on the remote host.")
    parser.add_option("--callback_script", dest = "callback_script", default = None,
                      help = "Script to process the output of each host.  The hostname will be passed as the first argument and the stdin/stderr from the host will be passed as stdin/stderr of the script")
    parser.add_option("--no_status", dest = "show_status", default = True, action = "store_false",
                      help = "Don't show a status count as the command progresses")
    parser.add_option("--sudo", dest="sudo", default=False,
                      action="store_true",
                      help = "Use sudo to run the command as root")
    parser.add_option("--password", dest="password", default=False,
                      action="store_true", help="Prompt for a password")

    (options, args) = parser.parse_args()

    if len(args) == 1 and options.runscript:
        firstline = open(options.runscript).readline().strip()
        if firstline.startswith('#!'):
            command = firstline[2:]
            args.append(command)

    # Default option values
    options.password = None
    options.username = getpass.getuser()
    options.output = True
    # Create our callback pipeline based on the options passed
    callback = [sshmap.callback.summarize_failures]
    if options.match:
        callback.append(sshmap.callback.filter_match)
    if options.output_base64:
        callback.append(sshmap.callback.filter_base64)
    if options.output_json:
        callback.append(sshmap.callback.filter_json)
    if options.callback_script:
        callback.append(sshmap.callback.exec_command)
    else:
        if options.aggregate_output:
            callback.append(sshmap.callback.aggregate_output)
        else:
            callback.append(sshmap.callback.output_prefix_host)
    if options.show_status:
        callback.append(sshmap.callback.status_count)
        # Get the password if the options passed indicate it might be needed
    if options.sudo:
        # Prompt for password, we really need to add a password file option
        try:
            options.password = os.environ['SSHMAP_SUDO_PASSWORD']
        except KeyError:
            options.password = getpass.getpass(
                'Enter sudo password for user ' + getpass.getuser() + ': ')
    elif options.password:
        # Prompt for password, we really need to add a password file option
        try:
            options.password = os.environ['SSHMAP_SUDO_PASSWORD']
        except KeyError:
            options.password = getpass.getpass(
                'Enter password for user ' + getpass.getuser() + ': ')

    command = ' '.join(args[1:])
    range = args[0]
    results = sshmap.run(
        args[0], command, username=options.username,
        password=options.password, sudo=options.sudo,
        timeout=options.timeout, script=options.runscript, jobs=options.jobs,
        sort=options.sort,
        shuffle=options.shuffle, output_callback=callback, parms=vars(options)
    )
    if options.aggregate_output:
        aggregate_hosts = results.setting('aggregate_hosts')
        collapsed_output = results.setting('collapsed_output')
        if aggregate_hosts and collapsed_output:
            rows, columns = os.popen('stty size', 'r').read().split()
            for md5 in aggregate_hosts.keys():
                print "=" * (int(columns)-2)
                print ','.join(hostlists.compress(aggregate_hosts[md5]))
                print "-" * (int(columns)-2)
                stdout, stderr = collapsed_output[md5]
                if len(stdout):
                    print ''.join(stdout)
                if len(stderr):
                    print >> sys.stderr, '\n'.join(stderr)
    if options.summarize_failed and 'failures' in results.parm.keys() and \
            len(results.parm['failures']):
        print(
            'SSH Failed to: %s' % hostlists.compress(results.parm['failures'])
        )
