#!/usr/bin/env 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.
#

import os
from optparse import OptionParser, OptionGroup
import sys
import locale
import socket
import re
from qmf.console import Session

class Config:
    def __init__(self):
        self._host = "localhost"
        self._connTimeout = 10
        self._stopId = None
        self._stopAll = False
        self._force = False
        self._numeric = False
        self._showConn = False
        self._delConn = None

class IpAddr:
    def __init__(self, text):
        if text.find("@") != -1:
            tokens = text.split("@")
            text = tokens[1]
        if text.find(":") != -1:
            tokens = text.split(":")
            text = tokens[0]
            self.port = int(tokens[1])
        else:
            self.port = 5672
        self.dottedQuad = socket.gethostbyname(text)
        nums = self.dottedQuad.split(".")
        self.addr = (int(nums[0]) << 24) + (int(nums[1]) << 16) + (int(nums[2]) << 8) + int(nums[3])

    def bestAddr(self, addrPortList):
        bestDiff = 0xFFFFFFFFL
        bestAddr = None
        for addrPort in addrPortList:
            diff = IpAddr(addrPort[0]).addr ^ self.addr
            if diff < bestDiff:
                bestDiff = diff
                bestAddr = addrPort
        return bestAddr

class BrokerManager:
    def __init__(self, config, conn_options):
        self.config       = config
        self.cert         = None
        self.conn_options = conn_options
        self.brokerName   = None
        self.qmf          = None
        self.broker       = None
        self.brokers      = []

    def SetBroker(self, brokerUrl):
        self.url = brokerUrl
        self.qmf = Session()
        self.broker = self.qmf.addBroker(brokerUrl, self.config._connTimeout, **self.conn_options)
        agents = self.qmf.getAgents()
        for a in agents:
            if a.getAgentBank() == '0':
                self.brokerAgent = a

    def Disconnect(self):
        """ Release any allocated brokers.  Ignore any failures as the tool is
        shutting down.
        """
        try:
            if self.broker:
                self.qmf.delBroker(self.broker)
                self.broker = None
            while len(self.brokers):
                b = self.brokers.pop()
                self.qmf.delBroker(b)
        except:
            pass

    def _getClusters(self):
        packages = self.qmf.getPackages()
        if "org.apache.qpid.cluster" not in packages:
            raise Exception("Clustering is not installed on the broker.")

        clusters = self.qmf.getObjects(_class="cluster", _agent=self.brokerAgent)
        if len(clusters) == 0:
            raise Exception("Clustering is installed but not enabled on the broker.")

        return clusters

    def _getHostList(self, urlList):
        hosts = []
        hostAddr = IpAddr(self.config._host)
        for url in urlList:
            if url.find("amqp:") != 0:
                raise Exception("Invalid URL 1")
            url = url[5:]
            addrs = str(url).split(",")
            addrList = []
            for addr in addrs:
                tokens = addr.split(":")
                if len(tokens) != 3:
                    raise Exception("Invalid URL 2")
                addrList.append((tokens[1], tokens[2]))

            # Find the address in the list that is most likely to be in the same subnet as the address
            # with which we made the original QMF connection.  This increases the probability that we will
            # be able to reach the cluster member.

            best = hostAddr.bestAddr(addrList)
            bestUrl = best[0] + ":" + best[1]
            hosts.append(bestUrl)
        return hosts

    def overview(self):
        clusters = self._getClusters()
        cluster = clusters[0]
        memberList = cluster.members.split(";")
        idList = cluster.memberIDs.split(";")

        print "  Cluster Name: %s" % cluster.clusterName
        print "Cluster Status: %s" % cluster.status
        print "  Cluster Size: %d" % cluster.clusterSize
        print "       Members: ID=%s URL=%s" % (idList[0], memberList[0])
        for idx in range(1,len(idList)):
            print "              : ID=%s URL=%s" % (idList[idx], memberList[idx])

    def stopMember(self, id):
        clusters = self._getClusters()
        cluster = clusters[0]
        idList = cluster.memberIDs.split(";")
        if id not in idList:
            raise Exception("No member with matching ID found")

        if not self.config._force:
            prompt = "Warning: "
            if len(idList) == 1:
                prompt += "This command will shut down the last running cluster member."
            else:
                prompt += "This command will shut down a cluster member."
            prompt += " Are you sure? [N]: "

            confirm = raw_input(prompt)
            if len(confirm) == 0 or confirm[0].upper() != 'Y':
                raise Exception("Operation canceled")

        cluster.stopClusterNode(id)

    def stopAll(self):
        clusters = self._getClusters()
        if not self.config._force:
            prompt = "Warning: This command will shut down the entire cluster."
            prompt += " Are you sure? [N]: "

            confirm = raw_input(prompt)
            if len(confirm) == 0 or confirm[0].upper() != 'Y':
                raise Exception("Operation canceled")

        cluster = clusters[0]
        cluster.stopFullCluster()

    def showConnections(self):
        clusters = self._getClusters()
        cluster = clusters[0]
        memberList = cluster.members.split(";")
        idList = cluster.memberIDs.split(";")
        displayList = []
        hostList = self._getHostList(memberList)
        self.qmf.delBroker(self.broker)
        self.broker = None

        idx = 0
        for host in hostList:
            if self.config._showConn == "all" or self.config._showConn == idList[idx] or self.config._delConn:
                self.brokers.append(self.qmf.addBroker(host, self.config._connTimeout))
                displayList.append(idList[idx])
            idx += 1

        idx = 0
        found = False
        for broker in self.brokers:
            if not self.config._delConn:
                print "Clients on Member: ID=%s:" % displayList[idx]
            connList = self.qmf.getObjects(_class="connection", _package="org.apache.qpid.broker", _broker=broker)
            for conn in connList:
                if not conn.shadow:
                    if self.config._numeric or self.config._delConn:
                        a = conn.address
                    else:
                        tokens = conn.address.split(":")
                        try:
                            hostList = socket.gethostbyaddr(tokens[0])
                            host = hostList[0]
                        except:
                            host = tokens[0]
                        a = host + ":" + tokens[1]
                    if self.config._delConn:
                        tokens = self.config._delConn.split(":")
                        ip = socket.gethostbyname(tokens[0])
                        toDelete = ip + ":" + tokens[1]
                        if a == toDelete:
                            print "Closing connection from client: %s" % a
                            conn.close()
                            found = True
                    else:
                        print "    %s" % a
            idx += 1
            if not self.config._delConn:
                print
        if self.config._delConn and not found:
            print "Client connection '%s' not found" % self.config._delConn

        while len(self.brokers):
            broker = self.brokers.pop()
            self.qmf.delBroker(broker)

def main(argv=None):

    try:
        config = Config()

        parser = OptionParser(usage="usage: %prog [options] BROKER",
                      description="Example: $ qpid-cluster -C  broker-host:10000")

        parser.add_option("-t", "--timeout", action="store", type="int", default=10, metavar="SECS", help="Maximum time to wait for broker connection (in seconds)")
        parser.add_option("--sasl-mechanism", action="store", type="string", metavar="<mech>", help="SASL mechanism for authentication (e.g. EXTERNAL, ANONYMOUS, PLAIN, CRAM-MD, DIGEST-MD5, GSSAPI). SASL automatically picks the most secure available mechanism - use this option to override.")
        parser.add_option("--ssl-certificate", action="store", type="string", metavar="<cert>", help="Client SSL certificate (PEM Format)")
        parser.add_option("--ssl-key", action="store", type="string", metavar="<key>", help="Client SSL private key (PEM Format)")
        parser.add_option("-C", "--all-connections", action="store_true", default=False, help="View client connections to all cluster members")
        parser.add_option("-c", "--connections",  metavar="ID", help="View client connections to specified member")
        parser.add_option("-d", "--del-connection",  metavar="HOST:PORT", help="Disconnect a client connection")
        parser.add_option("-s", "--stop",  metavar="ID", help="Stop one member of the cluster by its ID")
        parser.add_option("-k", "--all-stop", action="store_true", default=False, help="Shut down the whole cluster")
        parser.add_option("-f", "--force", action="store_true", default=False, help="Suppress the 'are you sure' prompt")
        parser.add_option("-n", "--numeric", action="store_true", default=False, help="Don't resolve names")

        opts, args = parser.parse_args(args=argv)

        if args:
            config._host = args[0]

        if opts.timeout != 0:
            config._connTimeout = opts.timeout
        else:
            config._connTimeout = None

        if opts.all_connections:
            config._showConn = "all"

        if opts.connections:
            config._connections = opts.connections
            if len(config._connections.split(":")) != 2:
                parser.error("Member ID must be of form: <host or ip>:<number>")

        if opts.del_connection:
            config._delConn = opts.del_connection
            if len(config._delConn.split(":")) != 2:
                parser.error("Member ID must be of form: <host or ip>:<number>")

        if opts.stop:
            config._stopId = opts.stop
            if len(config._stopId.split(":")) != 2:
                parser.error("Member ID must be of form: <host or ip>:<number>")

        if opts.ssl_key and not opts.ssl_certificate:
            parser.error("missing '--ssl-certificate' (required by '--ssl-key')")

        config._stopAll = opts.all_stop
        config._force = opts.force
        config._numeric = opts.numeric

        conn_options = {}
        if opts.sasl_mechanism:
            conn_options['mechanisms'] = opts.sasl_mechanism
        if opts.ssl_certificate:
            conn_options['ssl_certfile'] = opts.ssl_certificate
        if opts.ssl_key:
            conn_options['ssl_keyfile'] = opts.ssl_key

        bm = BrokerManager(config, conn_options)

        try:
            bm.SetBroker(config._host)
            if config._stopId:
                bm.stopMember(config._stopId)
            elif config._stopAll:
                bm.stopAll()
            elif config._showConn or config._delConn:
                bm.showConnections()
            else:
                bm.overview()
        except KeyboardInterrupt:
            print
        except Exception,e:
            bm.Disconnect()   # try to deallocate brokers - ignores errors
            if str(e).find("connection aborted") > 0:
                # we expect this when asking the connected broker to shut down
                return 0
            raise Exception("Failed: %s - %s" % (e.__class__.__name__, e))

        bm.Disconnect()
    except Exception, e:
        print str(e)
        return 1

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