#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2016-2017 Lenovo
#
# 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 optparse
import os
import select
import shlex
import subprocess
import sys

path = os.path.dirname(os.path.realpath(__file__))
path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
if path.startswith('/opt'):
    sys.path.append(path)

import confluent.client as client


argparser = optparse.OptionParser(
    usage="Usage: %prog node commandexpression",
    epilog="Expressions are the same as in attributes, e.g. "
           "'ipmitool -H {hardwaremanagement.manager}' will be expanded.")
argparser.disable_interspersed_args()
(options, args) = argparser.parse_args()
if len(args) < 2:
    argparser.print_help()
    sys.exit(1)
c = client.Command()
cmdstr = " ".join(args[1:])

nodeforpopen = {}
popens = []
for exp in c.create('/noderange/{0}/attributes/expression'.format(args[0]),
                    {'expression': cmdstr}):
    ex = exp['databynode']
    for node in ex:
        cmd = ex[node]['value'].encode('utf-8')
        cmdv = shlex.split(cmd)
        nopen = subprocess.Popen(
            cmdv, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        popens.append(nopen)
        nodeforpopen[nopen] = node

all = set([])
pipedesc = {}
exitcode = 0
for pop in popens:
    node = nodeforpopen[pop]
    pipedesc[pop.stdout] = { 'node': node, 'popen': pop, 'type': 'stdout'}
    pipedesc[pop.stderr] = {'node': node, 'popen': pop, 'type': 'stderr'}
    all.add(pop.stdout)
    all.add(pop.stderr)
rdy, _, _ = select.select(all, [], [], 10)
while all and rdy:
    for r in rdy:
        data = r.readline()
        desc = pipedesc[r]
        if data:
            node = desc['node']
            if desc['type'] == 'stdout':
                sys.stdout.write('{0}: {1}'.format(node,data))
            else:
                sys.stderr.write('{0}: {1}'.format(node, data))
        else:
            pop = desc['popen']
            ret = pop.poll()
            if ret is not None:
                exitcode = exitcode | ret
                all.discard(r)
    if all:
        rdy, _, _ = select.select(all, [], [], 10)
sys.exit(exitcode)