#!/usr/bin/env python3
#
# Copyright (c) 2017-2020  Joe Clarke <jclarke@cisco.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

from __future__ import division
from past.utils import old_div
import os
import re
import sys
import time
import json
import paramiko
from sparker import Sparker, MessageType
from multiprocessing import Pool
import traceback
import CLEUCreds
from cleu.config import Config as C


devices = ["CORE1-WA", "CORE2-WA"]
ROOM_NAME = "Core Alarms"
CACHE_FILE = "/home/jclarke/tcam_util.json"

spark = None


def send_command(chan, command):
    chan.sendall(command + "\n")
    i = 0
    output = ""
    while i < 10:
        if chan.recv_ready():
            break
        i += 1
        time.sleep(i * 0.5)
    while chan.recv_ready():
        r = chan.recv(131070).decode("utf-8")
        output = output + r

    return output


def get_results(dev, cache):
    global ROOM_NAME, spark
    commands = ["show platform hardware fed active fwd-asic resource tcam utilization"]

    ssh_client = paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    output = ""

    try:
        ssh_client.connect(dev, username=CLEUCreds.NET_USER, password=CLEUCreds.NET_PASS, timeout=5, allow_agent=False, look_for_keys=False)
        chan = ssh_client.invoke_shell()
        try:
            send_command(chan, "term width 0")
            send_command(chan, "term length 0")
            for cmd in commands:
                try:
                    output = send_command(chan, cmd)
                except Exception as iie:
                    sys.stderr.write("Failed to get result for {} from {}: {}\n".format(cmd, dev, iie))
                    traceback.print_exc()

        except Exception as ie:
            sys.stderr.write("Failed to setup SSH on {}: {}\n".format(dev, ie))
            traceback.print_exc()
    except Exception as e:
        sys.stderr.write("Failed to connect to {}: {}\n".format(dev, e))

    ssh_client.close()

    ready = False

    cache[dev] = {}

    for line in output.split("\n"):
        line = line.strip()
        if re.search(r"^-+$", line):
            ready = True
            continue
        if not ready:
            continue
        if len(line) == 0:
            break
        line = re.sub(r"\s+", " ", line)
        elements = line.split(" ")
        used = elements[-1]
        max = elements[-2]
        metric = " ".join(elements[0:-2])
        metric = metric.strip()
        m = re.search(r"(\d+)(/\d+)?", used)
        used = float(m.group(1))
        m = re.search(r"(\d+)(/\d+)?", max)
        max = float(m.group(1))
        perc = float(old_div(used, max)) * 100.0
        # if metric == 'Directly or indirectly connected routes':
        #    perc = 76.0
        if perc >= 75.0:
            msg = "{} on {} is {}% used".format(metric, dev, perc)
            spark.post_to_spark(C.WEBEX_TEAM, ROOM_NAME, msg, MessageType.BAD)

        cache[dev][metric] = perc


if __name__ == "__main__":
    spark = Sparker(token=CLEUCreds.SPARK_TOKEN)

    cache = {}

    for dev in devices:
        get_results(dev, cache)

    fd = open(CACHE_FILE, "w")
    json.dump(cache, fd, indent=4)
    fd.close()