#!/usr/bin/python
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.
#
# TODO: Needs cleaning and sanitazation.
#
import logging
import time
import re
import os.path
import paramiko
import subprocess
import socket
import tempfile
import logging
import logging.handlers

from xen.util.xmlrpcclient import ServerProxy
from xmlrpclib import Error
from xen.xend import XendClient
from agent.api.base import Agent
from agent.lib.settings import get_api_version
from xen.xend import sxp

class CloudStack(Agent):
    """
    Cloudstack plugin for OVM3.2.x.
    """

    # exposed services
    def get_services(self, version=None):
        return {
            'call': call,
            'get_vncport': getVncPort,
            'exec_domr': domrExec,
            'check_domr_port': domrCheckPort,
            'check_dom0_port': dom0CheckPort,
            'check_domr_ssh': domrCheckSsh,
            'check_dom0_ip': dom0CheckIp,
            # rename to dom0StorageStatusCheck
            'check_dom0_storage_health_check': dom0CheckStorageHealthCheck,
            # dom0StorageStatus
            'check_dom0_storage_health': dom0CheckStorageHealth,
            'ovs_domr_upload_file': ovsDomrUploadFile,
            'ovs_control_interface': ovsControlInterface,
            'ovs_mkdirs': ovsMkdirs,
            'ovs_check_file': ovsCheckFile,
            'ovs_upload_ssh_key': ovsUploadSshKey,
            'ovs_upload_file': ovsUploadFile,
            'ovs_dom0_stats': ovsDom0Stats,
            'ovs_domU_stats': ovsDomUStats,
            'get_module_version': getModuleVersion,
            'get_ovs_version': ovmVersion,
            'ping': ping,
        }

    def getName(self):
        return self.__class__.__name__

domrPort = 3922
domrKeyFile = os.path.expanduser("~/.ssh/id_rsa.cloud")
domrRoot = "root"
domrTimeout = 10

""" The logger is here """
def Logger(level=logging.DEBUG):
    logger = logging.getLogger('cloudstack-agent')
    logger.setLevel(level)
    handler = logging.handlers.SysLogHandler(address = '/dev/log')
    logger.addHandler(handler)
    return logger

# which version are we intended for?
def getModuleVersion():
    return "0.1"

# call test
def call(msg):
    return msg

def paramikoOpts(con, keyfile=domrKeyFile):
    con.load_system_host_keys()
    con.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    privatekeyfile = os.path.expanduser(keyfile)
    key = paramiko.RSAKey.from_private_key_file(privatekeyfile)
    return key

# execute something on domr
def domrExec(host, cmd, timeout=10, username=domrRoot, port=domrPort, keyfile=domrKeyFile):
    ssh = paramiko.SSHClient()
    pkey = paramikoOpts(ssh, keyfile)
    ssh.connect(host, port, username, pkey=pkey, timeout=timeout)
    ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(cmd)
    exit_status = ssh_stdout.channel.recv_exit_status()
    ssh.close()
    return { "rc": exit_status,
        "out": ''.join(ssh_stdout.readlines()),
        "err": ''.join(ssh_stderr.readlines()) };

# too bad sftp is missing.... Oh no it isn't it's just wrong in the svm config...
# root@s-1-VM:/var/cache/cloud# grep sftp /etc/ssh/sshd_config
# Subsystem   sftp    /usr/libexec/openssh/sftp-server
# root@s-1-VM:/var/cache/cloud# find / -name sftp-server -type f
# /usr/lib/openssh/sftp-server
#
def domrSftp(host, localfile, remotefile, timeout=10, username=domrRoot, port=domrPort, keyfile=domrKeyFile):
    try:
        paramiko.common.logging.basicConfig(level=paramiko.common.DEBUG)
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        pkey = paramikoOpts(ssh, keyfile)
        ssh.connect(host, port, username, pkey=pkey, timeout=timeout)
        sftp = ssh.open_sftp()
        # either:
        sftp.put(localfile, remotefile)
        # or:
        # rf = sftp.open(remotefile, 'w')
        # rf.write(content)
        # rf.close()
        sftp.close()
        ssh.close()
    except Exception, e:
        raise e
    return True

def domrScp(host, localfile, remotefile, timeout=10, username=domrRoot, port=domrPort, keyfile=domrKeyFile):
    try:
        target = "%s@%s:%s" % (username, host, remotefile)
        cmd = ['scp', '-P', str(port), '-q', '-o', 'StrictHostKeyChecking=no', '-i', os.path.expanduser(keyfile), localfile, target]
        rc = subprocess.call(cmd, shell=False)
        if rc == 0:
            return True
    except Exception, e:
        raise e
    return False

# check a port on dom0
def dom0CheckPort(ip, port=domrPort, timeout=3):
    return domrCheckPort(ip, port, timeout=timeout)

# check a port on domr
def domrCheckPort(ip, port=domrPort, timeout=3):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(timeout)
        s.connect((ip, port))
        s.close()
    except:
        return False
    return True

# check ssh
def domrCheckSsh(ip, port=domrPort, timeout=10):
    x = domrExec(ip, "", port=port, timeout=timeout)
    if (x.get("rc") == 0):
        return True
    return False

def grep(file, string):
    c = 0
    for line in open(file):
        if string in line:
           c = c + 1
    return c

def ovmVersion():
    path = "/etc/ovs-release"
    return re.findall("[\d\.]+$", open(path).readline())[0]

# fix known bugs....
def ovmCsPatch(version="3.2.1"):
    path = "/etc/xen/scripts"
    netcom = "%s/xen-network-common.sh" % path
    netbr = "%s/linuxbridge/ovs-vlan-bridge" % path
    func = "setup_bridge_port"
    # on 3.3.1 this moved to python2.6, but the restart time is already good
    xendConst = "/usr/lib64/python2.4/site-packages/xen/xend/XendConstants.py"
    xendRtime = "MINIMUM_RESTART_TIME"
    netconf = "/etc/sysconfig/network"
    netzero = "NOZEROCONF"
    version = ovmVersion()

    # this bug is present from 3.2.1 till 3.3.2
    if grep(netcom, "_%s" % func) == 3 and grep(netbr, "_%s" % func) < 1:
        _replaceInFile(netbr, func, "_%s" % func, True)

    # zeroconf is in the way for local loopback, as it introduces a route
    # on every interface that conflicts with what we want
    if grep(netconf, "%s" % netzero) == 0:
        text_file = open("%s" % netconf, "a")
        text_file.write("%s=no\n" % netzero)
        text_file.close()
    else:
        _replaceInFile(netconf,
            netzero,
            "no",
            False)

    # this is fixed in 3.3.1 and onwards
    if version == "3.2.1":
        if grep(xendConst, "%s = %s" % (xendRtime, 60)) == 1:
            _replaceInFile(xendConst,
                "%s = %s" % (xendRtime, 60),
                "%s = %s" % (xendRtime, 10),
                True)
            ovsRestartXend()

    return True

def _replaceInFile(file, orig, set, full=False):
    replaced = False
    if os.path.isfile(file):
        import fileinput
        for line in fileinput.FileInput(file, inplace=1):
            line = line.rstrip('\n')
            if full == False:
                if re.search("%s=" % orig, line):
                    line = "%s=%s" % (orig, set)
                    replaced = True
            else:
                if re.search(orig, line):
                    line = line.replace(orig, set)
                    replaced = True
            print line
    return replaced

def _ovsIni(setting, change):
    ini = "/etc/ovs-agent/agent.ini"
    return _replaceInFile(ini, setting, change)

# enable/disable ssl for the agent
def ovsAgentSetSsl(state):
    ena = "disable"
    if state and state != "disable" and state.lower() != "false":
        ena = "enable"
    return _ovsIni("ssl", ena)

def ovsAgentSetPort(port):
    return _ovsIni("port", port)

def ovsRestartAgent():
    return restartService("ovs-agent")

def ovsRestartXend():
    return restartService("xend")

# replace with popen
def restartService(service):
    command = ['service', service, 'restart']
    subprocess.call(command, shell=False)
    return True

# sets the control interface and removes the route net entry
def ovsControlInterface(dev, cidr):
    controlRoute = False
    command = ['ip route show'];
    p = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
    while True:
        line = p.stdout.readline()
        if line == '' and p.poll() != None:
            break
        if line != '':
            if re.search("%s" % (cidr), line) and not re.search("%s" % (dev), line):
                command = ['ip', 'route', 'del', cidr]
                subprocess.call(command, shell=False)
                print "removed: %s" % (line)
            elif re.search("%s" % (cidr), line) and re.search("%s" % (dev), line):
                controlRoute = True

    if controlRoute == False:
        command = ['ip', 'route', 'add', cidr, 'dev', dev];
        subprocess.call(command, shell=False)

    command = ['ifconfig', dev, 'arp']
    subprocess.call(command, shell=False)
    # because OVM creates this and it breaks stuff if we're rebooted sometimes...
    control = "/etc/sysconfig/network-scripts/ifcfg-%s" % (dev)
    command = ['rm', control]
    subprocess.call(command, shell=False)
    return True

def dom0CheckIp(ip):
    command = ['ip addr show']
    p = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
    while True:
        line = p.stdout.readline()
        if line != '':
            if re.search("%s/" % (ip), line):
                return True
        else:
            break
    return False

def dom0CheckStorageHealthCheck(path, script, guid, timeout, interval):
    storagehealth="storagehealth.py"
    path="/opt/cloudstack/bin"
    running = False
    started = False
    c = 0
    log = Logger()
    command = ["pgrep -fl %s | grep -v cloudstack.py" % (storagehealth)]

    p = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
    for x in p.stdout:
        if x:
            log.debug("%s is running %s" % (storagehealth, x.rstrip('\n')))
            running = True
            c = c + 1
    if c < 1:
        started = True
        command = ["%s/%s -g %s -t %d -i %d" % (path, storagehealth, guid, timeout, interval)]
        log.warning("%s started: %s/%s for %s with timeout %d and interval %d"
                    % (storagehealth, path, storagehealth, guid, timeout, interval))
        subprocess.call(command, shell=True, close_fds=True)

    return [running, started]

def dom0CheckStorageHealth(path, script, guid, timeout):
    response = None
    delay = timeout
    log = Logger()
    command = ["%s/%s -g %s -t %s -s" % (path, script, guid, timeout)]
    p = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
    p.wait()
    if p.returncode == 0:
        log.warning("primary storage is accessible for %s" % (guid))
        return True
    else:
        log.warning("primary storage NOT is accessible for %s" % (guid))
        return False
    # while True:
    #    line = p.stdout.readline()
    #   if line != '':
    #        if re.search("False", line):
    #            log.debug("primary storage NOT is accessible for %s, %s" % (guid, line))
    #            return False
    #    else:
    #        break
    # return True

# create a dir if we need it
def ovsMkdirs(dir, mode=0700):
    if not os.path.exists(dir):
        return os.makedirs(dir, mode)
    return True

# if a file exists, easy
def ovsCheckFile(file):
    if os.path.isfile(file):
        return True
    return False

def ovsUploadFile(path, filename, content):
    file = "%s/%s" % (path, filename)
    try:
        ovsMkdirs(os.path.expanduser(path))
    except Error, v:
        print "path was already there %s" % path

    try:
        text_file = open("%s" % file, "w")
        text_file.write("%s" % content)
        text_file.close()
    except Error, v:
        print "something went wrong creating %s: %s" % (file, v)
        return False
    return True

def ovsDomrUploadFile(domr, path, file, content):
    remotefile = "%s/%s" % (path, file)
    try:
        temp = tempfile.NamedTemporaryFile()
        temp.write(content)
        temp.flush()
        # domrSftp(domr, temp.name, remotefile)
        domrScp(domr, temp.name, remotefile)
        temp.close
    except Exception, e:
        print "problem uploading file %s/%s to %s, %s" % (path, file, domr, e)
        raise e
    return True

# upload keys
def ovsUploadSshKey(keyfile, content):
    keydir = os.path.expanduser("~/.ssh")
    return ovsUploadFile(keydir, keyfile, content)

# older python,
def ovsDom0Stats(bridge):
    stats = {}
    stats['cpu'] = "%s" % (100 - float(os.popen("top -b -n 1 | grep Cpu\(s\): | cut -d% -f4|cut -d, -f2").read()))
    stats['free'] = "%s" % (1048576 * int(os.popen("xm info | grep free_memory | awk '{ print $3 }'").read()))
    stats['total'] = "%s" % (1048576 * int(os.popen("xm info | grep total_memory | awk '{ print $3 }'").read()))
    stats['tx'] = os.popen("netstat -in | grep %s | head -1 | awk '{print $4 }'" % bridge).read()
    stats['rx'] = os.popen("netstat -in | grep %s | head -1 | awk '{print $8 }'" % bridge).read()
    return stats

def getVncPort(domain):
    port = "0"
    if re.search("\w-(\d+-)?\d+-VM", domain):
        server = ServerProxy(XendClient.uri)
        dom = server.xend.domain(domain, 1)
        devices = [child for child in sxp.children(dom)
            if len(child) > 0 and child[0] == "device"]
        vfbs_sxp = map(lambda x: x[1], [device for device in devices
            if device[1][0] == "vfb"])[0]
        loc = [child for child in vfbs_sxp
            if child[0] == "location"][0][1]
        listner, port = loc.split(":")
    else:
        print "no valid domain: %s" % domain
    return port

def get_child_by_name(exp, childname, default=None):
    try:
        return [child for child in sxp.children(exp)
                if child[0] == childname][0][1]
    except:
        return default

def ovsDomUStats(domain):
    _rd_bytes = 0
    _wr_bytes = 0
    _rd_ops = 0
    _wr_ops = 0
    _tx_bytes = 0
    _rx_bytes = 0
    stats = {}
    server = ServerProxy(XendClient.uri)
    dominfo = server.xend.domain(domain, 1)
    domid = get_child_by_name(dominfo, "domid")

    # vbds
    devs = server.xend.domain.getDeviceSxprs(domain, 'vbd')
    devids = [dev[0] for dev in devs]
    for dev in devids:
        sys_path = "/sys/devices/%s-%s-%s/statistics" % ("vbd", domid, dev)
        _rd_bytes += long(open("%s/rd_sect" % sys_path).readline().strip())
        _wr_bytes += long(open("%s/wr_sect" % sys_path).readline().strip())
        _rd_ops += long(open("%s/rd_req" % sys_path).readline().strip())
        _wr_ops += long(open("%s/wr_req" % sys_path).readline().strip())

    # vifs
    devs = server.xend.domain.getDeviceSxprs(domain, 'vif')
    devids = [dev[0] for dev in devs]
    for dev in devids:
        vif = "vif%s.%s" % (domid, dev)
        sys_path = "/sys/devices/%s-%s-%s/net/%s/statistics" % ("vif", domid, dev, vif)
        _tx_bytes += long(open("%s/tx_bytes" % sys_path).readline().strip())
        _rx_bytes += long(open("%s/rx_bytes" % sys_path).readline().strip())

    epoch = time.time()
    stats['rd_bytes'] = "%s" % (_rd_bytes * 512)
    stats['wr_bytes'] = "%s" % (_wr_bytes * 512)
    stats['rd_ops'] = "%s" % (_rd_ops)
    stats['wr_ops'] = "%s" % (_wr_ops)
    stats['tx_bytes'] = "%s" % (_tx_bytes)
    stats['rx_bytes'] = "%s" % (_rx_bytes)
    stats['cputime'] = "%s" % get_child_by_name(dominfo, "cpu_time")
    stats['uptime'] = "%s" % (epoch - get_child_by_name(dominfo, "start_time"))
    stats['vcpus'] = "%s" % get_child_by_name(dominfo, "online_vcpus")
    return stats

def ping(host, count=3):
    if os.system("ping -c %s %s " % (count, host)) == 0:
        return True
    return False

# add SystemVM stuff here....
#

#
# Self deploy and integration, not de-integration
# should return False if fails
#
# install us if we are missing in:
# /usr/lib64/python2.4/site-packages/agent/api
# and add our hooks in:
# /usr/lib64/python2.4/site-packages/agent/target/api.py
if __name__ == '__main__':
    from distutils.sysconfig import get_python_lib
    from agent.target.api import MODULES
    from shutil import copyfile
    import inspect, os, hashlib, getopt, sys

    # default vars
    exist = False
    agentpath = "%s/agent" % (get_python_lib(1))
    api = "%s/target/api.py" % (agentpath)
    modpath = "%s/api" % (agentpath)
    ssl = "disable"
    port = 0
    exec_sub = ""
    exec_opts = ""

    # get options
    try:
        opts, args = getopt.getopt(sys.argv[1:], "eosp::",
            [ 'port=', 'ssl=', 'exec=', 'opts='])
    except getopt.GetoptError:
        print "Available Options: --port=<number>, --ssl=<true|false>, --exec=<method>, --opts=<arg1,arg2..>"
        sys.exit()

    for o, a in opts:
        if o in ('-s', '--ssl'):
            ssl = a
        if o in ('-p', '--port'):
            port = int(a)
        if o in ('-e', '--exec'):
            exec_sub = a
        if o in ('-o', '--opts'):
            exec_opts = a

    if exec_sub != "":
        func = "%s(%s)" % (exec_sub, exec_opts)
        print "exec: %s" % (func)
        if exec_opts:
            opts = exec_opts.split(',')
        else:
            opts = ""
        print locals()[exec_sub](*opts)
        sys.exit()

    # check if we're in the modules already
    cs = CloudStack()
    for mod in MODULES:
        if re.search(cs.getName(), "%s" % (mod)):
            exist = True

    # if we're not:
    if not exist:
        if os.path.isfile(api):
            import fileinput
            for line in fileinput.FileInput(api, inplace=1):
                line = line.rstrip('\n')
                if re.search("import common", line):
                    line = "%s, cloudstack" % (line)
                if re.search("MODULES", line):
                    n = cs.getName()
                    line = "%s\n\t%s.%s," % (line, n.lower(), n)
                print line
            print "Api inserted, %s in %s" % (cs.getName(), api)
        else:
            print "Api missing, %s" % (api)
    else:
        print "Api present, %s in %s" % (cs.getName(), api)

    # either way check our version and install if checksum differs
    modfile = "%s/%s.py" % (modpath, cs.getName().lower())
    me = os.path.abspath(__file__)
    if os.path.isfile(modfile):
        if hashlib.md5(open(me).read()).hexdigest() != hashlib.md5(open(modfile).read()).hexdigest():
            print "Module copy, %s" % (modfile)
            copyfile(me, modfile)
        else:
            print "Module correct, %s" % (modfile)
    else:
        print "Module copy, %s" % (modfile)
        copyfile(me, modfile)

    # setup ssl and port
    if ssl:
        ovsAgentSetSsl(ssl)
    if port > 1024:
        ovsAgentSetPort(port)

    # restart either way
    ovmCsPatch()
    ovsRestartAgent()