#!/usr/bin/env python
#
#  Copyright (c) 2013 SWITCH http://www.switch.ch
#
#  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.
#

import argparse
import os
import subprocess
import sys

__version__ = '1.0.1'

# default ceph values
CEPH_COMMAND = '/usr/bin/ceph'

# nagios exit code
STATUS_OK = 0
STATUS_WARNING = 1
STATUS_ERROR = 2
STATUS_UNKNOWN = 3

def main():

    # parse args
    parser = argparse.ArgumentParser(description="'ceph health' nagios plugin.")
    parser.add_argument('-e','--exe', help='ceph executable [%s]' % CEPH_COMMAND)
    parser.add_argument('-c','--conf', help='alternative ceph conf file')
    parser.add_argument('-m','--monaddress', help='ceph monitor address[:port]')
    parser.add_argument('-i','--id', help='ceph client id')
    parser.add_argument('-k','--keyring', help='ceph client keyring file')
    parser.add_argument('-d','--detail', help="exec 'ceph health detail'", action='store_true')
    parser.add_argument('-V','--version', help='show version and exit', action='store_true')
    args = parser.parse_args()

    # validate args
    ceph_exec = args.exe if args.exe else CEPH_COMMAND
    if not os.path.exists(ceph_exec):
        print "ERROR: ceph executable '%s' doesn't exist" % ceph_exec
        return STATUS_UNKNOWN

    if args.version:
        print 'version %s' % __version__
        return STATUS_OK

    if args.conf and not os.path.exists(args.conf):
        print "ERROR: ceph conf file '%s' doesn't exist" % args.conf
        return STATUS_UNKNOWN

    if args.keyring and not os.path.exists(args.keyring):
        print "ERROR: keyring file '%s' doesn't exist" % args.keyring
        return STATUS_UNKNOWN

    # build command
    ceph_health = [ceph_exec]
    if args.monaddress:
        ceph_health.append('-m')
        ceph_health.append(args.monaddress)
    if args.conf:
        ceph_health.append('-c')
        ceph_health.append(args.conf)
    if args.id:
        ceph_health.append('--id')
        ceph_health.append(args.id)
    if args.keyring:
        ceph_health.append('--keyring')
        ceph_health.append(args.keyring)
    ceph_health.append('health')
    if args.detail:
        ceph_health.append('detail')

    #print ceph_health

    # exec command
    p = subprocess.Popen(ceph_health,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    output, err = p.communicate()

    # parse output
    #print "output:", output
    #print "err:", err
    if output:
        # merge multi-lines of output in one line
        one_line = output.replace('\n','; ')
        if one_line.startswith('HEALTH_OK'):
            #print 'HEALTH OK:', one_line[len('HEALTH_OK')+1:]
            one_line= one_line[len('HEALTH_OK')+1:].strip()
            if one_line:
                print 'HEALTH OK:', one_line
            else:
                print 'HEALTH OK'
            return STATUS_OK
        elif one_line.startswith('HEALTH_WARN'):
            print 'HEALTH WARNING:', one_line[len('HEALTH_WARN')+1:]
            return STATUS_WARNING
        elif one_line.startswith('HEALTH_ERR'):
            print 'HEALTH ERROR:', one_line[len('HEALTH_ERR')+1:]
            return STATUS_ERROR
        else:
            print one_line

    elif err:
        # read only first line of error
        one_line = err.split('\n')[0]
        if '-1 ' in one_line:
            idx = one_line.rfind('-1 ')
            print 'ERROR: %s: %s' % (ceph_exec, one_line[idx+len('-1 '):])
        else:
            print one_line

    return STATUS_UNKNOWN


if __name__ == "__main__":
    sys.exit(main())
